Method of radial tire repair, repaired radial tire and rubber patch

FIELD: transport.

SUBSTANCE: method includes phase of rubber patch in which multiple reinforcing elements (11) are mutually parallel and covered with rubber attachment (10) from inside of tire to damaged portion (7) of carcass layer (5a) when at least one cord thread (6a) of layer in carcass layer is torn together with layer rubber on bead section (3) of a tire. Rubber patch is attached so that reinforcing elements (11) lay parallel to radial direction of tire and that inner ends (11a, 11b, 11c) of reinforcing elements (11) in radial direction of tire lay in such a manner, that they could at least partially have mutually different distances from circumferential line of tire in perpendicular direction.

EFFECT: increased durability of rubber patch attached to damaged portion of carcass layer at inner tire side, increased lifetime of repaired tire with reduced repair time.

19 cl, 14 dwg, 1 tbl

 

This invention relates to a method of repairing a radial tire and repaired radial tire and, in particular, to a method of repairing a radial tire, which increases the durability of the rubber patches attached to the damaged part of the layer frame from the inner side of the tire, and which increases the service life of the repaired tyre.

In radial tires, particularly tires extra large sizes, such as tires of construction vehicles, may form a lateral cut in the result of collision with a sharp rock, or a large protruding object or a similar object, and thread the cord layer in the layer tire carcass may be torn along with a rubber layer on the side part of the tire. In some cases, the gap can be as large as the inner sealing layer on the inner side of the tire.

One way of repairing radial tires, damaged, therefore, is to use rubber patches formed by reinforced sheet in which many of reinforcing elements (patch cords), which are located parallel to each other, covered with rubber. Rubber patch is attached with glue to the inside of the tire to the damaged part of the layers of the frame, where the carcass layer was torn to strengthen the damaged part using patch cords. The typical way to use this is the first method will be described with reference to Fig. On Fig shows a view in plan of the on-Board part of the inside of the tire, showing the transparent layer 5A of the frame and the rubber patch 40, attached to the layer frame. Radial direction of the tire is marked with the letter R. Among the multitude of cords 6 of the layer in the layer 5a1a certain number of cords 6A layer torn. Note that the ply cords 6A layer are radially from the inner side to the outer side in the radial direction R of the tire. Rectangular rubber patch 40, attached to the damaged area, is a cord rubber covering layer, in which a lot of cords 41 patches that are parallel to each other, covered with rubber and were subjected to vulcanization. Rubber patch 40 is attached to the damaged area so that the cords 41 patches are parallel to the radial direction of the tire (on Fig the direction in which the medium passes the thread cord among the three torn cords), and so that the top edge 42 and bottom side 42b of the square are in the circumferential direction of the tire.

In the document JP 2162029 described A method of amplification, using a rubber patch, which includes part metallokordovogo rubber layer with plenty of metallic cords coated with rubber. Moreover, the rubber patch is attached by implementing this part damages the reduction zone, in which layer of the frame is broken, so that the metal cords connect the broken part of the torn thread the cord layer.

As a result of research the applicant has found that the following problems occur when using the method illustrated in Fig. On Fig inner ends 41A sets of cords 41 patches in the radial direction are located on a straight line along the bottom side 32b of the square. The damaged part (end) of cords patch attached poorly to the surrounding rubber. In addition, the ends 41A are arranged continuously in a straight line, making the gap between the damaged part of each of the cords 41 patches narrow. In this case, if the detachment from the surrounding rubber is at one end 41A, a crack is easily applicable to the adjacent ends. As a result, the delamination occurs at multiple ends 41A, again causing damage to parts, refurbished rubber patch 40. Because the gap between the ends 41A narrower cracks propagate more easily, and because the length of the straight line increases, the damage occurs earlier.

In the case of a radial tire, as described above, the threads of the fabric layer 6 are radially from the inner surface to the outer surface in the radial direction R of the tire. Therefore, in torn thread the cord layer 6A, the distance y1 in which upravlenii along the tire circumference of the torn ends of cords on the inner side in the radial direction of the tire is shorter than the distance x1 in the direction along the tire circumference of the torn ends of cords on the outer side in the radial direction of the tire. Accordingly, when the length of the upper side 42 of cords patches are installed properly from the point of view of providing a reinforcing effect (for example, three times larger than the distance x1), bottom side 42b of the square has the same length as the upper side, and thus has extra length from the point of view of providing a reinforcing effect. In other words, on the inner edge in the radial direction of the tire more ends than is necessary from the point of view of providing a reinforcing effect, are located on a straight line.

Furthermore, the method of repair, illustrated in Fig, requires a certain amount of time to clean up (sanded) on all sides of the damaged part and glue the rubber patch with glue. Because attaching rubber patches larger than necessary, the repair time is inevitably increased.

Objectives of the invention are to develop a method of repairing radial tires and radial tyre repaired with the help of this method, which increases the durability of the rubber patches attached to the damaged part of the layer frame from the inner side of the tire, and which will extend the service life of the repaired Shi is s and simultaneously reduces repair time.

Note that using the method described in JP 2162029 A metal cords embedded in rubber patch embedded in the torn part of the cord layer and serve only as a replacement of cords of the layer. No effect of increasing the strength of the damaged parts is achieved with the help of metal cords, and, therefore, the effect of increasing strength even worse than when using the method shown in Fig.

On the basis of the above according to the invention to prevent a decrease in durability of rubber patches, caused by the separation of the ends, it was proposed not to carry out the centering of the ends of the patch cords in a straight line. In addition, the lack of centering of the inner ends of the patch cords in the radial direction of the tire in a straight line does not lead to a deterioration of the effect of increasing strength.

In view of the aforementioned problem, the invention has the following features.

(1) a Method of repairing a radial tire comprising a tread portion, a pair of side portions, passing inward in the radial direction from each edge of the tread part, car parts, which are respectively from aircraft parts to the inside in the radial direction of the tire, and the frame having at least one radial carcass layer with many cords of the layer is covered with cramps is th layer, moreover, the carcass layer passes toroidal rims across portions, side portions and a tread portion, and at least one thread cord layer torn together with a rubber layer on one side of the parts, and this method includes the step of attaching a rubber patch on the inner side of the tyre to the damaged part of the bed frame with a torn thread the cord layer, and a rubber patch includes reinforced sheet with lots of reinforcing elements arranged parallel to each other and covered with rubber, and rubber patch is mounted in such a way that the reinforcing elements parallel to the radial direction of the tire and the inner ends of the reinforcing elements in the radial direction of the tire are arranged in such a way that they at least partially had mutually different distances perpendicular to the circumference of the tire.

(2) Preferably, the space between the reinforcing elements is narrower than the space between the cords of the layer.

(3) it is Preferable that the rubber patch has an essentially trapezoidal shape; and a rubber patch is mounted in such a way that pairs of parallel sides rubber patches longest side is outward in the radial direction of the tire, and the short side is located inside the radial direction of the tire, and so that a long side and a short side of the pass in the direction of the tire circumference.

(4) it is Appropriate that the form in terms of side parts inside the bus, transparently showing the carcass layer, closest to the inner surface of the tire, the area that connects the four ends of the two torn thread the cord layer among the torn thread the cord layer, the most separated in the direction of the tire circumference, is defined as the damaged area, and the outer side and the inner side in the radial direction of the tire are respectively the upper side of length x and the lower side of length y; edge rubber patches along the length of the top side, located at a distance (2 to 4)×(x/2) from the center P of the upper side; edges rubber patches along the length of the bottom side, located at a distance (2 to 4)×(y/2) from the center Q of the lower side; and the edges of the rubber patches, passing along the line PQ, the distance (2 to 4)×(z/2) from the center M of the line segment PQ of length z.

(5) According to the invention the angle of intersection between the reinforcing elements in each of the reinforced sheet and the line PQ connecting the center P of the upper side from the center Q of the lower side, is at least 0° C and maximum 30°.

(6) Rubber patch is devulcanizing rubber; and after cu is the accumulation rubber gaskets partial vulcanization is performed on the damaged part.

(7) the Method further includes the steps: remove the side rubber around the damaged part along the side part of the outside tires until then, until you are exposed carcass layer; and removing rubber inner sealing layer around the damaged part along the side part of the inside of the tire until then, until you are exposed carcass layer; and then: attaching a rubber patch to the damaged part of the bed frame; and applying the new side rubber around the damaged part of the outside tires.

(8) Preferably, the method further comprises the steps: prepare two pieces of rubber patches per damaged part; remove the side rubber around the damaged part along the side part of the outside tires; remove rubber inner sealing layer around the damaged parts along the side of the part from the inside tires to the exposure of the edges formed by the gap in the carcass layer; and respectively mounting rubber patches on the inner side and outer side of the radial tire in the places where the side rubber and rubber inner liner removed from a damaged part, so that the rubber patches are embedded in the edges and hold the edges formed the gap layer of the framework.

(9) Rubber patch is attached to the outer side of the radial tire has a greater R is setting the log file name, than rubber patch is attached on the inner side radial tires.

(10) Preferably, when the generate fastening of rubber patches, respectively, on the inner side and outer side of the radial tire, the longitudinal direction of the reinforcing elements in each of the rubber patches center relative to the longitudinal direction torn cords of the layer.

(11) the intersection Angle between the cords of the layer and each of the reinforcing elements to rubber patches is at least 0° C and maximum 30°.

(12) Another object of the invention is a radial tyre repaired with the help of the method according to any of paragraphs.(8)-(11).

(13) Another object of the invention is repaired radial tire comprising a tread portion, a pair of side portions, passing inward in the radial direction of the tire from each edge of the tread part, car parts, which are respectively from aircraft parts to the inside in the radial direction of the tire, and the frame having at least one radial carcass layer with many cords of the layer is covered with a rubber layer and the carcass layer passes toroidal rims across portions, side portions and a tread portion, and at least one thread cord layer in the layer frame broken together with rubber layer in one of brevicula; rubber patch is attached on the inner side of the tire to the damaged part of the bed frame with a torn thread the cord layer, and a rubber patch includes reinforced sheet with lots of reinforcing elements arranged parallel to each other and covered with rubber; rubber patch attached in such a way that the reinforcing elements parallel to the radial direction of the tire, the inner ends of the reinforcing elements in the radial direction of the tire are arranged in such a way that they at least partially had mutually different distances perpendicular to the circumference of the tire.

(14) it is Preferable that the gap between the reinforcing elements are narrower than the space between the cords of the layer.

(15) Rubber patch has an essentially trapezoidal shape; and a rubber patch attached in such a way that pair of parallel sides rubber patches longest side is outward in the radial direction of the tire, and the short side is located inside in the radial direction of the tire, and that a long side and a short side of the pass in the direction of the tire circumference.

(16) Preferably, in the plan portion of the side wall from inside the bus, transparently showing the carcass layer, closest to the inner surface of the tire, is it, connecting four end torn cords two torn thread the cord layer among torn cords, most separated in the direction of the tire circumference, is defined as the damaged area, and the outer side and the inner side in the radial direction of the tire are respectively the upper side of length x and the lower side of length y; and the edges of the rubber patches along the length of the top side, the distance (2 to 4)×(x/2) from the center P of the upper side; edges rubber patches along the length of the bottom side, located at a distance (2 to 4)×(y/2) from the center Q of the lower side; and the edges of the rubber patches along the line PQ, the distance (2 to 4)×(z/2) from the center M of the line segment PQ of length z.

(17) the Angle of intersection between the reinforcing elements in each of the reinforced sheet and the line PQ connecting the center P of the upper side from the center Q of the lower side, is at least 0° C and maximum 30°.

(18) the Object of the invention is also a rubber patch for repairing a radial tire, comprising: at least one reinforced sheet with lots of reinforcing elements parallel to each other and covered with rubber, the ends of the reinforcing elements, the ends of at least one side of the reinforcing elements RA is placed so so they at least partially had mutually different distances perpendicular to the given line.

(19) it is Preferable that the ends of the reinforcing elements are distributed along all sides of the rubber patch.

According to this invention a rubber patch is attached so that the inner ends of the reinforcing elements in the radial direction of the tire are arranged so that they at least partially had mutually different distances perpendicular to the circumference of the tire. Therefore, the inner ends of the patch cords in the radial direction of the tire is not centered in a straight line. As a result, there is a possibility to increase the durability of rubber patches, attached to the damaged part of the bed frame from the inner side of the tyre, and to increase the service life of the repaired tire. In addition, since the inner ends in the radial direction are arranged, as described above, the repair time can be reduced compared with the use of square patches, shown in Fig as rubber patch is not attached to the not needed parts to ensure an effect of increasing strength.

The invention will be described below with reference to the accompanying drawings, which are presented next.

Figure 1 is rendered view in cross-section, made in the direction of the width, half the typical repaired radial tire according to this invention.

Figure 2 shows left on an enlarged scale view of the damaged part of the frame 5 side parts, depicted in figure 1, and on the right is given a view of the damaged part of the inner side of the tire, showing in dotted line the damaged part of the 7 layers of the frame having attached thereto a rubber patch 10, and showing the boundary line on the outer surface of the tire side rubber portion 33, which was re-imposed during repair.

Figure 3 shows a diagram illustrating a typical method of repairing a radial tire according to this invention, and (a) shows the state in which the radial tire 1 has received a cut side to side parts 3 and layer 5A of the carcass torn, (b) shows the state in which the side rubber portion 30 around the damaged part 7 have been removed from the outside of the tire until then, until exposing the layer structure to form (C) shows the state in which the rubber portion 31 of the inner sealing layer around the damaged part 7 have been removed from inside the bus until until exposing the layer structure to form (d) shows a state in which a new side rubber portion 33 around the damaged part 7 was applied on the outside of the tire, and (e) shows the status is of that in which rubber patch 10 is made integrally with the new part 34 of the inner sealing layer was attached to the damaged part 7.

Figure 4 shows the layer 5A of the frame that is closest to the inner surface of the tire side portion on the inner surface of the tire, and rubber patch 10 is attached to the layer frame, thread the cord layer 6, shown in solid line, and the cords 11 patches, shown in dotted lines to illustrate the relative position between the cords 6 layer and the cords 11 patches, although they are covered with rubber.

Figure 5 is given diagram, showing only the rubber patch 10 in the form of cross-section, made wills line 1-1, figure 4.

Figure 6 is given a structural diagram illustrating the size of the rubber patch 10 with respect to the damaged zone 8.

7 shows an approximately trapezoidal shaped rubber patches, which can be used in this invention, and (a) shows a trapezoid with rounded vertices, and (b) shows a trapezoid with rounded tops and curved parallel sides, and (C) shows a trapezoid whose vertices are rounded and two sides other than the two parallel sides, bent.

On Fig, like figure 4, given a view in plan of a portion of the side wall from inside the bus, transparently pok the binding layer 5a 1frame and rubber patch 10 is attached to the layer frame, radial tires, renovated using traditional method for repairing a radial tire.

Figure 9 shows a view in plan of a rubber patch made according to this invention, showing the number of reinforcing elements 51 located inside the reinforced sheet 50, depicted by dashed lines.

Figure 10 shows a diagram in cross section (half circuit)made in the direction of the width of the radial tire, which was repaired using the repair method, which serves as an example implementation of this invention.

Figure 11(a) shows a view in plan showing an example of the rubber patches, which can be used in the repair method of the present invention, and (b) given a view in transverse section made along the line J-J 11(a).

On Fig(a)to(e) shown in an enlarged scale views in cross section of the damaged parts in the radial tire shown in figure 10, illustrating stages of a method of repair, which serves as an example implementation of this invention.

On Fig shows a view in plan of a rubber patch, showing the size and other features of rubber patches, suitable for repair of the damaged area.

On Fig(a) shows the shape of a rubber patch the comparative example 20 and on the types (b)-(e) shows the shape of a rubber patch in examples 21-24.

The invention will now be described in more detail with reference to the accompanying drawings. Note that, as a General rule, the same elements have the same reference numbers and their description will be omitted.

Figure 1 shows a typical radial tyre repaired in accordance with this invention. Radial tire 1, which repair is carried out using the method of the present invention has a tread portion 2 (shown only on half of the bus), a pair of side parts 3 (shown only one), passing inward in the radial direction of the tire from each edge of the tread part 2, rims part 4 (shown only one), which pass, respectively, of the side parts 3 inward in the radial direction of the tire and the frame 5 at least one radial layer 5A of the frame (one layer, shown in figure 1), passing the toroidal across the rims of 4 parts, on-Board parts 3 and the tread portion 2. Layer 5A is a rubber coated cord layer in which a lot of cords 6 is covered with a rubber layer. Steel, organic fibers and similar materials are examples of the material of the cords. The cords 6 are angled components from 70° to 90° relative to the direction of the circumference of the tire. aturally rubber, synthetic rubber, carbon black and similar materials are examples of material for rubber layer, and the hardness (the hardness of JIS-A according to JIS-K-6253) is approximately 40 to 80 units.

In one of the side parts 3, when at least one thread cord layer 6A (figure 4 shows three ply cords in the layer 5A of the frame cut off together with the rubber layer, apply the repair method of the present invention. An implementation option of the repair method of the present invention will be described together with its results.

Option 1 implementation of the invention: method of repairing radial tires

First will be described a method of repair according to this variant embodiment of the invention. Figure 3(a) shows the state in which the radial tire 1 has received a lateral incision in one of the side parts 3 and layer 5A of the frame was broken. Figure 3(a) incision reached the inner sealing layer on the inner surface of the tire. Symbol 5 marked the damaged part of the layer frame.

First stage is to remove the side rubber parts 30 around the damaged part 7 on the outside of the tire until then, until you are exposed layer 5A of the frame. In the case of multiple layers the deletion occurs until then, until you have exposed the outer layer in the direction of the width of the tire. Remove the side rubber parts 30 can you alsatica, for example, using the machine to restore the tread pattern, and the final processing can be performed by grinding or similar way until outcrops layer 5A of the frame. Figure 3(b) shows the state after the execution of delete operations. Natural rubber, synthetic rubber, carbon black and similar materials are examples of material for the side rubber. Thickness ranges from 30 to 70 units JIS-A, and the side rubber is softer than the rubber layer.

Then, a step for removing rubber parts 31 of the inner sealing layer around the damaged part 7 from the inside of the tire until then, until you are exposed layer 5A of the frame. In the case of multiple layers the deletion occurs up until not bare the innermost layer in the width direction of the tire. Remove rubber parts 31 of the inner sealing layer can be carried out analogously to remove the side rubber parts 30. For subsequent mounting rubber patch 10 to the exposed surface after removal of the rubber parts 31 of the inner sealing layer preferably is finishing by grinding, to form the corresponding surface roughness. Figure 3(C) shows the state after the removal. Vysokovostrebovannye butyl rubber is an example of the mother of the La for the manufacture of the inner sealing layer, and the inner sealant layer is softer than the rubber side.

It then executes the step of applying the new side rubber portion 55 around the damaged part 7 on the outside of the tire. New side rubber portion 33 is devulcanizing soft rubber and can be applied, for example, a putty knife to fill in the damaged portion 7 and the side part. Figure 3(d) shows the state after application. New side rubber portion 33 is preferably made of the same material as before the repair.

Then, a step of attaching a rubber patch 10 to the damaged part of the 7 layers of the frame from the inner side of the tire. In this embodiment of the present invention a rubber patch 10 is produced in advance together with the new integral rubber part 34 of the inner sealing layer and attached to the damaged part 7 by means of glue or a similar substance. New rubber part 34 of the inner sealing layer preferably represents the same butyl rubber, and repair. Figure 3(e) shows a state after mounting rubber patch 10. New side rubber portion 33 can be applied on the outside of the tire after mounting rubber patch 10. By removing the rubber around the damaged part 7 before attaching rubber patch 10, as is done in the nom embodiment of the invention, rubber patch 10 can be reliably and easily be attached to the layer 5A of the frame.

As shown in figure 4 and 5, the rubber patch 10 is formed by reinforced sheet 10A, which is a cord rubber covering layer, wherein a set of reinforcing elements 11 are parallel to each other and covered with rubber. Note that in this invention the set of reinforcing elements arranged parallel to each other" does not limit the number of reinforcing elements arranged parallel to each other in a strict mathematical sense, but rather means that the reinforcing elements are in the same direction. Natural rubber, synthetic rubber, carbon black and similar materials are examples of the material for the coating rubber reinforcing elements. Hardness of approximately 40 to 80 units according to JIS-A, and in particular rubber is preferably the same as the rubber used in the carcass layer. The number of reinforcing elements 11 is not limited, if only they were elements that reinforce the strength of the damaged parts, and they can represent not only twisted the cords, but also single thread or multiple twisted strands. A preferred example of the reinforcing element 11 is superfine nylon thread cord with a diameter of filaments comprising from 0.4 to 1.5 mm Mod the eh of tensile elasticity preferably represents the average elastic modulus at elongation from x/2 to 2/3 (%) relative elongation tensile at break x (%). The modulus of tensile elasticity is, for example, 5 GPA, and preferably from 3.0 to 7.0 GPA. The reinforcing elements 11 are preferably thinner than the threads of the fabric layer. This is because if you use the same material and the same diameter as that of the cords of the layer, the reinforcing elements have too much tensile stress, resulting in the fact that their ends can be easily separated.

Rubber patch 10 is not embedded in the damaged part 7, but rather is reinforced sheet from the inside of the tire so as to cover the entire damaged part 7 (right side of figure 2). Therefore, rubber patch 10 is a flat sheet.

Before attaching a rubber patch 10 preferably is devulcanizing rubber, and after the step of attaching a rubber patch 10 partial vulcanization is preferably performed on the damaged part 7. Through the use of devulcanizing rubber, rubber patch can be attached accurately to the surface of the damaged part and then be vulcanized to prevent that air bubbles will remain around the damaged part. In addition, even if the rubber patch is attached to its vulcanization, partial vulcanization must be performed on the damaged part for vulcanization newly imposed side by the howling rubber parts 33, etc. Therefore, pre-vulcanization of the rubber patch is not preferred, because in this case the rubber patch 10 will be vulcanized to a greater extent than is necessary.

On the left side of figure 2 shows in enlarged view the repaired portion in the radial tire repaired that way. In this embodiment of the present invention a rubber patch has a trapezoidal shape, as shown on the right side of figure 2 and figure 4. Rubber patch 10 is mounted in such a way that pairs of parallel sides 12A and 12b rubber patch 10 long side 12A is located outward in the radial direction of the tire, the short side 12b is located inside in the radial direction of the tire, and a long side 12A and a short side 12b are in the direction of the tire circumference. Figure 4 radial direction of the tire is specified symbol R. In a rubber patch 10 to the trapezoidal shape of the reinforcing elements 11 are arranged so that they are perpendicular to the long side 12A and the short side 12b. Therefore, rubber patch 10 is mounted in such a way that the reinforcing elements 11 are placed in parallel with the radial direction R of the tire (in this embodiment of the invention, the direction in which the medium passes the thread cord from Tr is x torn cords 6A layer).

The following describes the characteristic construction of this variant embodiment of the invention. Due to the location of the above-described reinforcing elements 11, the form of rubber patches 11 and how attached rubber patch 10, the inner ends of the reinforcing elements 11 in the radial direction of the tire are distributed along the line among the ends 11a on the left side of figure 4, the ends 11b on the short side 12b and 11C on the right side of figure 4. As a result, the ends 11a, the ends 11b and the ends 11C are arranged so that they have mutually different distances perpendicular to the circumference of the tyre, indicated by the symbol X. Accordingly, as shown in Fig, not all of the inner ends 11a, 11b and 11C reinforcing elements centered in a straight line. In this case, the ends 11a and the ends 11C are wider intervals than the ends 11b, and even if these ends of the crack, the crack spreads less than the crack formed at the ends 11b. In addition, even if a crack is formed at the ends 11b, this crack does not easily extend to the ends 11a or ends 11C. Thus, it is possible to increase the durability of the rubber patches 10 and to increase the service life of the repaired tire 1.

In addition, since the threads of the fabric layer 6 are radially damaged the flanged portion 7 has the shape of an inverted trapezoid. Accordingly, the mount rubber patch 10 of the same shape in the same way as an inverted trapezoid, allows you to attach a rubber patch 10 necessary and sufficient to ensure the amplification of strength. The repair may be as a result of this reduced compared to Fig, since there is no need to attach too much rubber patch.

As shown in figure 4, the space between the reinforcing elements 11 preferably is narrower than the space between the cords of the layer. This is done to ensure that the reinforcing elements 11 is reliably increased the strength of the damaged part 7. In the case of nylon cords having a modulus of tensile elasticity of 5 GPA, the thread diameter of 1.2 mm, the number of embedded cords patch is preferably from 2.5 to 5.8 threads/cm, and more preferably from 3.3 to 5.0 threads/see the ranges are selected, the value of at least 2.5 threads/cm provides the effect of a more robust increase strength, and maximum value of 5.8 threads/cm, more reliably provides the effect of preventing separation.

While the reinforcing elements 11 are parallel to each other, the threads of the fabric layer 6 are radially. Therefore, except for the middle ply cords of the layer of the three torn cords 6A of the layer, not all art is yousie elements 11 are parallel to the cords of the layer. This configuration is preferable to the arrangement of the reinforcing elements 11 also radially, as achieved a significant gain strength. Note that the intersection between the reinforcing elements and the cords of the layer will be further described below with reference to Fig.6.

As shown in figure 5, with the aim of providing an effect of increasing strength rubber patch 11 is preferably formed by layers of reinforced sheet 10A. When the reinforcing elements 11 are used nylon thread cord with a core diameter of 1.2 mm, with the goal of providing an effect of increasing strength is preferably provided approximately four to six layers.

Next, a suitable size of attached rubber patch 10 will be described with reference to Fig.6. By focusing on the torn thread the cord layer 6A damaged part 7 is now defined more precisely. As shown in figa, the damaged part 7 applies to the cavity, in which the strands of the cord layer and the rubber layer is torn in layer 5A of the frame. On the other hand, focusing on the torn cords 6A layer in this invention in the form in terms of side parts 3 from the inside of the bus, transparently showing the layer 5A of the frame (in the case of multiple layers of the carcass layer 5a1closest to the inner surface of the tire), the area that connects the four to the NCA 21, 22, 24 and 23 torn cords two threads 6a1and 6A2Korda from a torn cords 6A, the most divided in the direction of the tire circumference, is defined as the damaged area 8. The outer side and the inner side of the damaged zone 6 in the radial direction of the tire, respectively, defined as the upper side 25 (length x) and the lower side 26 (length y). Edges 13A and 13b rubber patch 10 along the length of the upper side 25, preferably located at a distance (2 to 4)×(x/2) from the center P of the upper side 25. Figure 6 position at a distance of 2×(x/2) from the center P is specified the symbol R', and the position at a distance of 4×(x/2) from the center P is specified the symbol R". Accordingly, the edges 13A and 13b are located between P' and P". Similarly, edges 14a and 14b rubber patch 10 along the length of the lower side 26, preferably located at a distance (2 to 4)×(y/2) from the center Q of the lower part 25. Figure 6 position at a distance of 2×(y/2) from the center Q is specified symbol Q', and the position at a distance of 4×(y/2) from the center Q is specified symbol Q". Accordingly, the edges 14a and 14b are located between Q' and Q". In addition, edges 15A and 15b rubber patch 10 along the line PQ, the distance (2 to 4)×(z/2) from the center M of the line segment PQ (length z). Figure 6 position at a distance of 2×(z/2) C is ntre M specified symbol And, and the position at a distance of 4×(z/2) from the center of M is specified symbol C. a Multiplier factor of 2 or more for these items helps provide a more robust increase in strength of the damaged zone 8, while fastening the large rubber patch, which is more than a factor of 4, does not provide the additional effect of increasing the strength, but instead increases the duration of the repair because the repair is not necessary areas. Thus, preferably attached rubber patch is larger than two to four times the size of the damaged zone 8.

Next, the intersection between the reinforcing elements 11 and cords 6 are additionally described below with reference to Fig.6. In this embodiment of the present invention intersection angle 9 between the reinforcing elements 11 and the line PQ connecting the center P of the upper side 25 with the center Q of the lower side 26, is preferably 0° and a maximum of 30°. When the number of broken cords layer 6A is odd, as shown in Fig.6, the line PQ passes in the direction of a Central ply cords of the torn thread the cord layer 6A. When this number is even, the line PQ passes in the direction of a Central line between the two cords of the layer in the middle. Figure 4 shows the case when θ=0°. The arrangement of the reinforcing elements parallel to the cords of the layer is not I who is preferred since the reinforcing elements have too much tensile stress. In this embodiment of the present invention the reinforcing elements are non-parallel relative to almost all of the cords of the layer. Therefore, when θ=0°, a sufficient effect of increasing the strength is ensured thanks to the effect of the weave between the cords of the layer and the reinforcing elements. On the other hand, if the angle 9 exceeds 30°, the effect of weave is weakened, and thus the angle amounting to a maximum of 30°is preferred.

When the rubber patch is formed by applying many layers of reinforced sheets 10A, the angle of intersection when 9 reinforcing elements 11 in each of the reinforced sheet is preferably at least when 0° and a maximum of 30°. In this case, reinforced sheets are preferably inclined consistently, for example, in the opposite direction relative to the line PQ, i.e. at an angle+15°, -15°, +15°.... In an alternative embodiment, may be repeated sequence+15°, 0°, -15°. Note that the reinforcing elements in each layer are within the above angular ratio before attaching it to the damaged area and partial vulcanization.

The repair method according to the invention can be applied to any radial tire, and yet it is effective when CA is applied to the tires of very large size, such as the tires of construction vehicles that are most often suffer from large lateral cuts and high cost of tires.

Option 2 implementation of the invention: method of repairing radial tires

In the Embodiment 1 of implementation of the present invention shows an example of mounting trapezoidal rubber patch 10, but instead just a trapezoidal shaped rubber patch 10 may have an approximately trapezoidal shape in which the top and sides slightly rounded. Figure 7(a)-7(C) shows such examples. In relation to other things Option 2 implementation of the present invention is similar to Option 1 implementation of the present invention.

Option 3 implementation of the invention: other methods of repair

Rubber patch used in this invention is not limited in the sense that it must be approximately trapezoidal shape. Provided that the rubber patch in which the ends of the reinforcing elements are located along all sides, can be designed so that the inner ends of the reinforcing elements in the radial direction of the tire is not centered in a straight line, rubber patch can be of any shape and may be attached in any way.

Option 4 of the invention: repaired radial tire

Option 4 assests the of the present invention is a radial tire 1, repaired using the repair method illustrated above. 1 shows a diagram of half of the tire in cross section, is made in the direction of the width of the tire, this radial tires. Because the majority of the features have been described in the Embodiment 1 of implementation of the present invention, further description is omitted. Symbol 32, however, marked tape, secured to the outside in the radial direction of the tire and made of one or more layers cordovero rubber coating. Examples of cords are steel cords or cords of organic fibers.

In the repaired radial tire 1 rubber patch is mounted in such a way that the reinforcing elements 11 are placed in parallel with the radial direction R of the tire, so that the inner ends of the reinforcing elements in the radial direction of the tire are arranged to have mutually different distances perpendicular to the line X tire circumference. In respect of other characteristic features of the design of the renovated part of the repaired tyre is the same as the construction described in the Embodiment 1 of implementation of the present invention.

Option 5 of the invention: rubber patch

Option 5 implementation of the present invention is a rubber Zaplata (figure 4), which is intended for repairing radial tires and which can be successfully used in the above method of repair and the repaired tire. Rubber patch 10 has at least one reinforced sheet 10A with many reinforcing elements 11 running parallel to each other and covered with rubber. Among the ends of the reinforcing elements 11 the ends 11a, 11b and 11C at least on one side of the reinforcing elements are arranged in such a way that they had mutually different distances perpendicular to the given line. In this embodiment of the present invention, the end 11a, the end 11b and the end of the 11S have mutually different distances in a perpendicular direction from any of the imaginary lines. According to this construction, when the rubber patch is attached to the damaged parts, the inner ends of the reinforcing elements in the radial direction of the tire can be located so that they were not in a straight line, and the repair method of the present invention can be applied.

Alternatively, a rubber patch may be such as shown in Fig.9. Rubber patch 50, depicted in Fig.9(a), has a rectangular reinforced sheet 50A with many reinforcing elements 51, forming an angle of 45° to each side and parallel to each other. Thus among the ends of each of the reinforcing elements 51 not all the ends 52a and 52b of reinforcing elements in the lower part of the diagram have the same distance in the perpendicular direction from any of the imaginary lines. Rubber patch 50 figure 9(b) has a rectangular reinforced sheet 50A, in which one of the long sides rounded and curved outwards, with many reinforcing elements 51, parallel to the short side, and each other. In this case, not all the ends 52 of the reinforcing elements at the bottom of the diagram have the same distance in the perpendicular direction from any of the imaginary lines. Rubber patch 50 figure 9(C) has a rectangular reinforced sheet 50A, in which both the long side rounded and curved outwards, with many reinforcing elements 51, parallel to the short sides and each other. This case is preferable because not only the ends 52 of the reinforcing elements at the bottom of the schema, but also the ends of the reinforcing elements at the top of the diagram, not all have the same distance in the perpendicular direction from any of the imaginary lines.

Note that these rubber patch, rubber patch 10 shown in figure 4, and a rubber patch 50, depicted in Fig.9(a), in which the ends of the reinforcing elements are distributed along all sides, are preferred, since these rubber patches make it easy to avoid attaching a rubber patch to the not needed parts to ensure an effect of increasing strength, thereby reducing the time REM the NTA. In addition, the degree of freedom for mounting to the damaged parts increases.

Option 6 of the invention: method of repairing radial tires

If you have any doubts as to increase the strength of the damaged part of, when, as in the above-described method of repair, rubber patch is attached only to reinforce the damaged part of the frame on the inside of the tire, particularly when the damaged part is large, and when the cords of three or more consecutive layers are broken, there is a risk that the repaired part will again be damaged before reaching the expected term wear. On the other hand, to ensure sufficient strength of using this method of repair, it is necessary to attach a rubber patch that is large enough relative to the damaged part of the frame that causes the need to remove the rubber on a large area around the damaged part of the frame and use a large number of rubber coating for coating rubber patches. Thus, we can expect a significant increase in repair time and cost of materials. Because the stiffness of the repaired parts may be less than the surrounding parts, there is a risk of what will happen further damage, n is cineasia in places with different hardness, such as the ends of the reinforcing elements in a rubber patch and the torn ends of the cords of the layer.

Therefore, another objective of the invention is to propose a method of repairing pneumatic tires, which allows you to use the bus until the expiration of wear and which reduces repair time by providing sufficient strength, when you repair damage to tyres caused by a corrupted frame.

The method of repair of radial tires designed to achieve the above objectives, is a method of repairing a radial tire comprising a tread portion, a pair of side portions, passing inward in the radial direction of the tire from each edge of the tread part, car parts, which are respectively from aircraft parts to the inside in the radial direction of the tire, and the frame having at least one radial carcass layer with many cords of the layer is covered with a rubber layer and the carcass layer passes toroidal rims across portions, side portions and a tread portion, and at least one thread cord layer in the carcass layer is broken together with the rubber layer on one of the side parts. Two pieces of rubber patches, each of which includes many of reinforcing elements arranged parallel to each other and covered with the rubber, prepare per the damaged part of the layer frame with a torn cord layer. Side remove the rubber around the damaged part along the side part of the outside tires. Rubber inner sealing layer is removed around the damaged part along the side parts from the inside of the tire to expose the edges formed by the gap layer frame. Rubber patches respectively attached on the inner side and outer side of the radial tire in the place where the side rubber and rubber inner sealing layer has been removed with the damaged parts, so that the reinforcing elements is parallel with the radial direction of the tire and to the inner ends of the reinforcing elements in the radial direction of the tire were located so that they have mutually different distances perpendicular to the circumference of the tire. Rubber patches cover and hold the edges formed by the breakage of the carcass layer.

In the bus was repaired using this method, the edges formed by the breakage of the carcass layer, covered by two rubber patches. Thus, the strength is increased in comparison with the method of repair, which attach only one rubber patch to the torn section of the layers of the frame that allows you to use the bus to reach the expected term of the depreciation of the aircraft is in that the repaired section will be damaged again. In addition, since it results in a sufficient increase in strength due to the use of rubber patches, reliable repair is possible even when the damaged part is large or torn when three or more adjacent strands of the cord layer. A sufficient increase in strength is also provided without increasing the size of the rubber patches, as is done traditionally. Reinforced area (size rubber patches) may hold the minimum size, thereby reducing the repair time and cost of materials. In addition, since the stiffness of the repaired part can be made equivalent stiffness of the surrounding parts, no damage, starting at the ends of the reinforcing elements to rubber patches or edges formed by the gap in the cords. Additionally, due to mounting rubber patches in such a way that the reinforcing elements are arranged parallel to the radial direction of the tire and so that the inner ends of the reinforcing elements in the radial direction of the tire are arranged in such a way that they had mutually different distances perpendicular to the circumference of the tire, the gap between the ends is increased. The investigator is about, if the crack starts at the end of the crack does not extend easily to the adjacent ends. Accordingly, it is possible to increase the durability of the rubber patches and lengthen the service life of the repaired tyre.

In this way repairing radial tires rubber patch attached on the outside of the tire, preferably is greater than the rubber patch is attached on the inner side of the tire.

In this way repairing radial tires, when attached rubber patches respectively on the inner side and the outer side of the tire, the longitudinal direction of the reinforcing elements preferably center relative to the longitudinal direction torn thread the cord layer.

In addition, this method of repairing radial tires intersection angle between the cords of the layer and the reinforcing elements in a rubber patch is at least 0° and a maximum of 30°.

Option 6 implementation of the present invention, which is based on the above construction will now be described in detail.

Figure 10 symbol 101 denotes a pneumatic tire (hereinafter referred to as bus), i.e. the radial tire repaired by using the repair method used as an example in this embodiment of the present invention. The bus has a frame 111 formed at least one slo is m layer 111a frame with lots of cords 109 layer, covered with a rubber layer, which pass from the rim portion 103 across a side portion 105 to the tread portion 107. Material for the manufacture of cords 109 may be steel, organic fiber, or similar material, and it is not limited to these examples.

Natural rubber, synthetic rubber, carbon black and similar materials are examples of the material for the rubber layer. The hardness of rubber may be set to approximately 40 to 80 units according to JIS-A. Next will be described a method of repairing a damaged portion in the tire 101, in which is formed a slit up the side, causing breakage of three cords in the layer 111a of the framework.

Figure 11 shows an example of rubber patches, which can be used as a reinforcing cordovero layer in the repair method of the present invention. As shown in figure 11, the rubber patch 113 is formed at least one layer of the reinforced sheet a, in this case eight layers, i.e. kordovy rubber reinforcing layer with many reinforcing elements 115 that are located parallel to each other and covered with rubber. In this case, the flat shape of the rubber patch is a trapezoid, and a part of the ends or the ends of the reinforcing elements are arranged so that they are not horizontally centered. The number of reinforcing elements 115 may be changed as necessary according to the accordance with the number of broken strands of cord or similar. The material for the rubber covering of the reinforcement elements 115 may be natural rubber, synthetic rubber, carbon black or similar materials. The hardness of rubber is set to approximately 40 to 80 units according to JIS-A, and, in particular, this rubber is equivalent to the rubber used in the layer 111a of the frame. Reinforcement elements 115 can be a steel ply cords or cords of organic fibers. In the case of organic fiber material ply cords can be a predetermined number of twisted bundles of fibers, a single fiber or multiple nesmith threads.

To repair the damaged part 117, shown in Fig(a)using such a rubber patch 113, first, as shown in Fig(b) and 12(C), edges 119 formed by the gap layer 111a frame strip by removing a damaged portion 117 of the side rubber parts parts 121 and 122 of the inner sealing layer adjacent to the inner and outer surfaces of the frame 111 by grinding or similar method on the inner side and outer side of the tyre, at the same time, to the extent possible, without exposing the cords of the layer 111a frame.

Then, as shown in Fig(d) and 12(e), rubber patches 113 attached on the inner side and outer side of the tyre to the corresponding depressions 123 in the damaged part 17, educated in the removal of the side rubber parts 121 and rubber parts 122 of the inner sealing layer, at the same time not exposing the extent possible, the cords of the layer 111a of the frame. These two rubber patches 113 is attached in such a way as to insert the ends 119 formed by the gap layer 111a of the frame. At this point, rubber patches 113 is attached in such a way that the longitudinal direction of the reinforcing elements 115 in each of the rubber patches 113 centered relative to the longitudinal direction torn thread the cord layer 109. In other words, the fastening is carried out so that the reinforcement elements 115 are parallel to the radial direction of the tire. In addition, rubber patches attached so that the inner ends of the reinforcing elements 115 in the radial direction of the tire are arranged so that they have mutually different distances perpendicular to the circumference of the tire. As a result, the gap between the ends is expanded, so that even if a crack is formed on the end of the crack does not extend easily to the adjacent end. Therefore, it is possible to increase the durability of the rubber patches 113 and to increase the service life of the repaired bus 101.

Then devulcanizing new side rubber portion 125 and the second rubber portion 126 of the inner sealing layer, which can be the same material as remote rubber parts 121 and 122, is applied on the upper surface of the attached rubber patches 113. After applying a new side rubber portion 125 and a new rubber part 126 of the inner sealing layer vulcanizer. Rubber patch 113 before the mount is also preferably made of devulcanizing rubber, and their vulcanizer simultaneously with the vulcanization of the new side rubber portion 125 and a new rubber part 126 of the inner sealing layer. The reason for this is that if the rubber patches are pre-embedded, there is a risk of excessive vulcanization in the vulcanization new side rubber portion 125 and a new rubber part 126 of the inner sealing layer. In addition, the use of rubber patches 113, which are devulcanization before attaching them to the bus allows you to accurately attach the rubber patch 113 to the bus, thereby preventing the ingestion or the formation of air bubbles.

In the bus was repaired using this method, the edges formed by the gap in the carcass layer are sandwiched on both sides with two rubber patches. Thus, the strength is greatly increased in comparison with the traditional method of repair in which only one rubber patch attached to the torn section of the layers of the frame, that allows you to use the bus to achieve the expected term wear without it being repaired section will again experience the damage. In addition, since it results in a sufficient increase in strength with rubber patches 113, reliable repair is possible even when the damaged part is large, and when three or more adjacent strands of the cord layer is torn. A sufficient increase in strength is also provided without increasing the size of the rubber patches, as is done traditionally. Reinforced area (the size of the rubber patch 113) can result in minimized, thereby reducing the repair time and cost of materials. In addition, since the stiffness of the repaired part can be made equivalent stiffness of the surrounding parts, no damage, starting at the ends of the reinforcing elements 115 in rubber patches 113 or on the edges formed by the gap cords 109 layer.

In the above-described embodiments of this invention cause the application of trapezoidal shape for rubber patches 113 the following. The damaged area 127 (area shown by diagonal lines), formed by a break in the wires of the cord layer 109, as shown in Fig, is defined as the area is limited to the two most outer torn threads to the Yes a and 109b layer and the lines L1 and L2 of a circle, which are respectively perpendicular to the outer edge a in the radial direction of the tire and the inner edge 119b in the radial direction of the tire among edges 119, educated breaks when multiple threads cord layer 109 torn. The damaged area 127 has an approximately trapezoidal shape, and fastening rubber patches 113 similar form allows you to minimize the size of the rubber patch 113 and at the same time to ensure the effect of increasing the strength.

At this point, the size of the rubber patch 113 attached on the inner side of the tyre, preferably from 2 to 4 times the size of the damaged zone 127, so as to form an area of overlap 129 (shown shaded part on Fig) between edges 119 formed by breaks in the wires of the cord layer 108, and the periphery of the rubber patch 113. Rubber patch 113 more preferably center with the damaged area 127 so that the area of overlap 129 was formed uniformly. On the other hand, the size of the rubber patch 113 attached on the outside of the tire, preferably from 1.1 to 4 times the size of the damaged zone 127, so as to form an area of overlap 129 between edges 119 formed by breaks in the wires of the cord layer 109, and the periphery of the rubber patch 113. rubber patch 113 more preferably of center who have damaged area 127, so that the area of overlap 129 formed uniformly. In the result, two opposite rubber patches 113 can securely hold the edges 119 formed by breaks in the wires of the cord layer 109 that allows rubber patches 113 reliably to increase the strength of the reinforcement. If the size of the outer rubber patches 113 less than twice the size of the damaged zone 127, or if the size of the inner rubber patches 113 is less than 1.1 times the size of the damaged zone 127, rubber patches 113 not hold edges 119 formed by breaks in the wires of the cord layer 109, with sufficient strength. Conversely, if the size of the inner or outer rubber patches 113 exceeds 4 times the size of the damaged zone 127, not only the strength of the reinforcement is too big, but the repair time is also increasing.

Preferably, the rubber patch 113 attached on the outside of the bus 101, was more than a rubber patch 113 attached on the inside of the bus 101. The reason for this is that the rubber patch 113 attached to the outer side has a greater effect gain strength than rubber patch 113 attached on the inner side, and the difference in size allows to reduce the torque applied to the rubber patches 113.

The gap d between the reinforcement elements 115 in rubber is hapletah 113 preferably narrower than the interval D between the strands of the cord layer 109 so as to allow the rubber patches 113 effectively increase the strength of the damaged site.

When attached rubber patches 113, rubber patches 113 preferably have a so that the longitudinal direction of the reinforcing elements 115 in each of the rubber patches 113 was centered with the longitudinal direction torn cords 109 layer (in particular, of cords 109 layer in the layer closest to the rubber patches 113). As a result of this mikotova shear deformation between the cords 109 layer and the reinforcing elements 115 can be prevented.

In the process of repairing damage to provide radial location of cords 109 layer of reinforcing elements to rubber patches preferably have so that they intersect at an angle of approximately 0° to ±30° relative to the longitudinal direction of the cords layer 109. The angle of intersection is referred to here, is the angle of intersection between the reinforcement elements 115 and the longitudinal direction of the Central strands of the cord layer 109 among refurbished cords 109 layer, or in case of repair even number of cords 109 layer on the Central line between the two cords 109 layer in the middle. The angle of intersection between the reinforcement elements 115 and n the authorities cord layer 109 may vary between reinforced sheets a, forming each rubber patch 113. From car parts to the convex side, in which only one thread cord is damaged, the longitudinal direction of the reinforcing elements in the attached rubber patch may be in the range from 0° to ±30° relative to the longitudinal direction of the cords of the layer, with the value of 0° is preferred, as is possible.

EXAMPLES

Evaluation test 1

Then, for further illustration of the results of the implementation of the present invention will be given below comparative evaluation of methods of repair according to the examples and comparative examples.

Example 1

Radial tyre for off-road (ORR 46/90R57) was installed on the test rim, the appropriate technical conditions JATMA (Japan Association of manufacturers of automotive tires), and were run for 3000 hours with a speed of 8 km/h, provided the internal pressure of 700 kPa and a load 63 so Then, as shown in figure 3(a) and figure 4, was made a lateral cut tires to break three cords in the carcass layer.

The number of layers of the framework: 1

Carcass ply cords: steel ply cords with a diameter of cords 4,2

Material for rubber layer: natural rubber

Rubber patch was applied using the steps shown in figure 3. Then was fulfilled partial vulcanization damages the Noah part, the result that was obtained repaired radial tire.

The material for the rubber patches: natural rubber (vulcanized rubber)

Ply cords patch: nylon thread cord with a diameter of cords 1.2 mm

The number of embedded cords per layer: 4 threads/cm

Rubber patch was formed from three layers of reinforced sheets with θ=0° in each sheet.

As for the size of the damaged zone and rubber patches in terms of description, is shown in Fig.6, the damaged area was as follows: length x upper hand = 25 mm, the length of the bottom side = 23 mm, and the height z of the line PQ=100 mm. In contrast, the size of the rubber patch was as follows: length between anchor points 13A and 13b=75 mm, length between anchor points 14a and 14b=46 mm, and the length between the reference points AB=200 mm the Ends, therefore, was located in positions 3×(x/2), 2×(y/2) 2×(z/2).

Evaluation of durability of the damaged parts

Refurbished bus ran over and measured the time until the moment when the damage begins at the edge of the reinforcing elements in a rubber patch. As time increases, the durability of rubber patches above. Table 1 shows the results of measurements.

Repair time

Time for repair was measured until the moment before the partial vulcanization. In table 1 on asana measurements.

Comparative example 1

In addition to repair the tire by attaching the rectangular rubber patches, as shown in Fig, otherwise the trial was conducted under the same conditions as in Example 1. The length of the long sides was the same as the length of a long side in a pair of parallel sides of the trapezoid of example 1.

Example 2. Comparative example 2

In addition, that the rubber patch before the mount was made from devulcanizing rubber, otherwise, the test was conducted under the same conditions as in example 1 and comparative example 1.

Examples 3-5

In addition, the shape of a rubber patch was the same as shown in Fig.7(a), 7(b) and 7(C), otherwise the trial was conducted under the same conditions as in Example 2. Note that figure 7 two peaks along the long sides are rounded with a radius of curvature of 3 mm, and two vertices along the short sides are rounded with a radius of curvature of 6 mm in Addition, figure 7(b) of the long side and the short side is curved with the respective radii of curvature of 200 mm and 100 mm, and 7(C) two sides other than pairs of parallel sides, bent with the radius of curvature of 100 mm

Examples 6-8

In addition, the angle θ was changed as indicated in table 1, the reinforcing elements of all three layers, otherwise the trial was conducted under the same conditions as in example 2.

Note the ry 9-12

Also, what size rubber patches were changed as indicated in table 1 in the rest of the test was conducted under the same conditions as in example 2.

Table 1 shows that the tyre repaired with the help of examples of the method of repair according to this invention, a rubber patch has greater durability, and the repair time is less than the tire repaired using the repair method of the comparative examples.

Evaluation test 2

Then, we evaluated the performance on a sample of the tyre repaired with the use of the method of repair according to option 6 implementation of the present invention, as described below. All tires used in examples 21 to 24 and comparative example 20 are radial tires for off-road (ORR 46/90R57).

In radial tires used in examples 21 to 24 and comparative example 20 side side felt side cut, which led to the rupture of the three cords of the layer and the damaged area did not differ from each other. The accepted method of repair was to mount rubber patches of the same shape, respectively, on the inner side and outer side of the tires of examples 21 to 24 and the fastening of rubber patches on the outside of the tire of comparative example 20. Shaped rubber patches were shown in Fi is .14(a) for comparative example 20, on Fig(b) of example 21, Fig(C) for example 22, Fig(d) for example 23 and Fig(e) for example 24. Three layers of reinforcing sheets were used in all rubber patches, which are fastened so that they formed uniformly perehlestyvajushchy zone, and so that the reinforcing elements is parallel with one of the torn thread the cord layer.

Refurbished tires of examples 21-24 and comparative example respectively fastened to the rims installed on the car, and used in the usual way with a standard load standard internal pressure. The result is that the tires of examples 21-24 were used to achieve a period of wear, i.e. until then, until it became visible slip line, without damage repaired. Duration of use was 2500 h to example 21, 2400 h for example 22, 2600 h for example 23 and 2500 hours, for example 24. Renovated section of the tire of comparative example have experienced damage that began at the edge of the reinforcing cord, after 1000 hours of use before the tire was completely worn out. For the comparative example, the repair required 80 min for grinding and mounting rubber patches, whereas this time was reduced to 45 min for examples 21-24.

As the results of the above assessments, repairs made with the help of the method of repair of examples 21-24, allows you to use the bus until it reaches the period of wear and tear and reduces repair time.

According to this invention has the ability to increase the durability of rubber patches, attached to the damaged part of the bed frame from the inner side of the tyre, and to increase the service life of the repaired tire. Repair time can also be reduced, because the rubber patch is not attached to the not needed parts to ensure an effect of increasing strength.

1. Method of repairing a radial tire containing a tread portion, a pair of side portions, passing inward in the radial direction from each edge of the tread part, car parts, which are respectively from aircraft parts to the inside in the radial direction of the tire, and the frame having at least one radial carcass layer with many cords of the layer is covered with a rubber layer and the carcass layer passes toroidal rims across portions, side portions and a tread portion, and at least one thread cord layer torn together with a rubber layer on one of the side parts, while perform the following steps:
- attach the rubber patch on the inner side of the tyre to the damaged part of the bed frame with a torn thread the cord layer, and a rubber patch contains reinforced sheet with many reinforcing elements stored is, located parallel to each other and covered with rubber,
and rubber patch attached in such a way that the reinforcing elements are arranged parallel to the radial direction of the tire, the inner ends of the reinforcing elements in the radial direction of the tire are arranged in such a manner that at least partially have mutually different distances perpendicular to the circumference of the tire.

2. The method according to claim 1, wherein a gap between the reinforcing elements are made narrower than the space between the cords of the layer.

3. The method according to claim 1 or 2, in which the rubber patch perform essentially trapezoidal shape and a rubber patch attached in such a way that between a pair of parallel sides rubber patches longest side is outward in the radial direction of the tire, and the short side is located inside in the radial direction of the tire, with a long side and a short side of the pass in the direction of the tire circumference.

4. The method according to claim 1, in which the form in terms of side parts inside the bus, transparently showing the carcass layer, closest to the inner surface of the tire, the area that connects the four ends of the two torn thread the cord layer, the most separated in the direction of the tire circumference, is defined as the damaged area, and the outer side and the inner with Orono in the radial direction of the tire are respectively the upper side of length x and the lower side of length y;
flange rubber patches along the length of the top side, located at a distance (2 to 4)×(x/2) from the center P of the upper side;
flange rubber patches along the length of the bottom side, located at a distance (2 to 4)×(y/2) from the center Q of the lower side; and
flange rubber patches, passing along the line PQ, the distance (2 to 4)×(z/2) from the center M of the line segment PQ of length z.

5. The method according to claim 4, in which the angle of intersection between the reinforcing elements in each of the reinforced sheet and the line PQ connecting the center P of the upper side from the center Q of the lower side, is at least 0° C and maximum 30°.

6. The method according to claim 1, in which the rubber patch is devulcanizing rubber; and
- after mounting the rubber grommets partial vulcanization is performed on the damaged part.

7. The method according to claim 1, wherein remove the side rubber around the damaged part along the side part of the outside tires until then, until you are exposed layer of the frame, and remove the rubber inner sealing layer around the damaged part along the side part of the inside of the tire until then, until you are exposed carcass layer, and then:
- attach the rubber patch to the damaged part of the bed frame;
- put new rubber side around the damaged part of the outside tires.

. The method according to claim 1, in which prepare two pieces of rubber patches per the damaged part, remove the side rubber around the damaged part along the side part of the outside tires, remove the rubber inner sealing layer around the damaged parts along the side of the part from the inside tires to the exposure of the edges formed by the gap layer frame, attach the rubber patch on the inner side and outer side of the radial tire in the places where the side rubber and rubber inner sealing layer removed with the damaged parts, rubber patches placed on the edges to keep the edges formed by the gap layer of the framework.

9. The method according to claim 8, in which the rubber patch is attached to the outer side of the radial tire is larger than the rubber patch is attached on the inner side radial tires.

10. The method according to claim 8, in which when performing mounting rubber patches respectively on the inner side and outer side of the radial tire longitudinal direction of the reinforcing elements in each of the rubber patches center relative to the longitudinal direction torn cords of the layer.

11. The method according to claim 8, in which the intersection angle between the cords of the layer and each of the reinforcing elements to rubber patches is at least 0° is a maximum of 30°.

12. Radial tyre repaired with the help of the method according to any of PP-11.

13. Repaired radial tire containing a tread portion, a pair of side portions, passing inward in the radial direction of the tire from each edge of the tread part, car parts, which are respectively from aircraft parts to the inside in the radial direction of the tire, and the frame having at least one radial carcass layer with many cords of the layer is covered with a rubber layer and the carcass layer passes toroidal rims across portions, side portions and a tread portion, and in the specified bus:
at least one thread cord layer in the layer frame broken together with rubber layer on one of the side pieces;
- rubber patch is attached on the inner side of the tire to the damaged part of the bed frame with a torn thread the cord layer, and a rubber patch contains reinforced sheet with lots of reinforcing elements arranged parallel to each other and covered with rubber;
- rubber patch attached in such a way that the reinforcing elements parallel to the radial direction of the tire, the inner ends of the reinforcing elements in the radial direction of the tire are arranged in such a way that they at least partially had mutually different distances in erpendicular direction from the circumference of the tire.

14. The tire according to item 13, in which the space between the reinforcing elements are made narrower than the space between the cords of the layer.

15. The tire according to item 13 or 14, in which the rubber patch has an essentially trapezoidal shape, wherein the rubber patch is attached in such a way that pair of parallel sides rubber patches longest side is outward in the radial direction of the tire, and the short side is located inside in the radial direction of the tire, and that a long side and a short side of the pass in the direction of the tire circumference.

16. The tire according to item 13, in which the form in terms of side parts inside the bus, transparently showing the carcass layer, closest to the inner surface of the tire, the area that connects the four ends of the two torn thread the cord layer of torn cords, most separated in the direction of the tire circumference, is defined as the damaged area, and the outer side and the inner side in the radial direction of the tire are respectively the upper side of length x and the lower side of length y;
flange rubber patches along the length of the top side, the distance (2 to 4)×(x/2) from the center P of the upper side;
flange rubber patches along the length of the bottom side, located at a distance (2 to 4)×(y/2) from the center Q of the lower side; and
- Kronk the rubber patch located along the line PQ, the distance (2 to 4)×(z/2) from the center M of the line segment PQ of length z.

17. The tire according to clause 16, in which the angle of intersection between the reinforcing elements in each of the reinforced sheet and the line PQ connecting the center P of the upper side from the center Q of the lower side, is at least 0° C and maximum 30°.

18. Rubber patch for repairing a radial tire, comprising:
at least one reinforced sheet with lots of reinforcing elements parallel to each other and covered with rubber, and
among all reinforcing elements the ends of at least one side of the reinforcing elements are arranged in such a way that they at least partially had mutually different distances perpendicular to the given line.

19. Patch by p, in which the ends of the reinforcing elements are distributed along all sides of the rubber patch.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to elastomer compositions, possessing improved air-tightness. Vulcanite elastomer composition includes at least one C4-C7 monoolefin elastomer, hydrocarbon additive and clay. Hydrocarbon polymer additive includes 75 wt % of cyclic components, with its MW constituting 500-700 g/mol and Tc constituting 65-75°C. Permeability coefficient of vulcanite elastomer composition at 40°C constitutes 90 cm3·mm/(m2·day) or less. Vulcanite composition represents barrier for air.

EFFECT: invention makes it possible to improve mixture technological effectiveness and increase air-tightness.

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1 dwg

FIELD: transport.

SUBSTANCE: invention relates to design of pneumatic tire capable to discharge static electricity of vehicle to road surface. Tread rubber (2G) includes undertread layer (9) located radially inside so that this layer goes continuously from one tread edge (el) to another tread edge (e2) and made of nonconductive rubber, running path (10) made of nonconductive rubber and located radially outside from undertread layer (9) with tread (2a) formation, and conducting part (11) made of conducting rubber and having one end coming out on tread (2a) and another end connected with rubber (3G) of sidewall electrically connected with rim when the rim is installed. Running path (10) includes the first part (10A) of running path and the second part (10B) of running path obtained by division in vertical direction. Conducting part (11) goes from tread (2a) radially inwards between the first part (10A) of running path and the second part (10B) of running path, and the second part (10B) of running path before connecting with sidewall rubber (3G).

EFFECT: better vehicle static electricity discharge to road surface without decrease of rolling resistance and tire uniformity.

26 cl, 26 dwg, 3 tbl

Land rover tire // 2467882

FIELD: transport.

SUBSTANCE: invention relates to automotive super-low pressure tires for use on impassability and soils of low bearing capacity. Proposed tire rated at 0.005-0.070 MPa comprises tread, carcass made of rubberized cord, side strips with cord layers turned up to bead rings. It has lengthwise grooves separating tread cleats of its central part from central ribs. Note here that the ratio between tire profile height and width varies from 0.45 to 0.7.

EFFECT: better cross-country capacity, higher speed on solid road cover, reduced noise.

7 cl, 6 dwg

FIELD: transport.

SUBSTANCE: invention relates to extra-low-pressure tires of transport facilities to be used on transport facilities moving off-the-road and over low-strength soils. The tire contains carcass with shell the thickness of which is made essentially constant and provided with central tread section. The shell thickness is 0.007-0.030 of tire section height.

EFFECT: better grip of off-roader tire over low-strength soils without destruction of surface layer, higher speed of travel on hard-surface roads lower noise.

12 cl, 9 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive tire to be used for travelling over ice and snow. Running surface (10) of non-studded snow tire is positioned so that side grooves (3A, 3B, 3C, 3D, 5) running in axial direction in each of grain blocks (2A, 2B, 2C, 2D) the axial length of side grooves (3A, 3B, 3C, 3D) disclosing in at least one of straight longitudinal grooves (1, 1A, 1B) running adjacent to grain block where side groove is contained is called groove edge element. Ratio of total length of groove edge elements on inner running surface IN to total length of groove edge elements on outer running surface OUT is equal to 1.03-1.3. Ratio of negative outer running surface coefficient OUT to negative inner running surface coefficient IN is equal to 0.85-1.0.

EFFECT: higher grip, as well as driving stability during travelling over ice and snow.

2 cl, 1 dwg

Non-spiked tire // 2440249

FIELD: transport.

SUBSTANCE: invention relates to non-spiked tire for low-rigidity tread. Distance A is measured from section wherein tire ring is divided to position whereat maximum tire width is formed in cross section of tire 10 crossing central axial line whereon pressurised tire is fitted on rim 11. Distance B is measured from position whereat tire ring is divided along tire radial direction. Side profile factor defined as A:B ratio in the state whereat tire is mounted on vehicle varies from 0.52 to 0.55 in direction of semi-segment width on outer side in mounting on vehicle, and from 0.45 to 0.50 in direction of semi-segment width on inner side in mounting on vehicle, or from 0.5 to 0.35 in direction of semi-segment width on outer side in mounting on vehicle, and from 0.45 to 0.48 in direction of semi-segment width on inner side in mounting on vehicle.

EFFECT: better stability in straight run.

3 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Proposed method comprises distributing pneumatic tires to be fitted on wheel rim to groups of sizes from (a) to (o) and securing noise killers made from made from sponge material on tire surface facing tire cavity confined by rim and pneumatic tire so that at least noise killers of identical cross section and identical ring length are used for any aforesaid groups (a) to (o).

EFFECT: efficient noise killing, higher efficiency of production, transportation and storage.

4 cl, 8 dwg

FIELD: transport.

SUBSTANCE: proposed pair comprises front wheel and rear wheel tires. Difference (F15-R15) at 15° toe-out between axial force (F15) at front wheel toe-out and rear wheel toe-out makes at least -0.038 but not over 0.038. Difference (F30-R30), at 30° toe-out. Between front wheel axial force (F30) and rear wheel toe-out force (R30) makes at least 0.038, but not over 0.114. Axial force (F30) at 30° toe-out makes at least 0.570. Difference (F45-R45) at 45° toe-out between (F45) and (R45) makes at least 0.076, but not over 0.228.

EFFECT: better controllability and stability at turns.

3 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: balloon of tyre-type pneumatic clutch consists of pressure-tight chamber, of cord frame and of external and internal treads. Metal blocks with friction straps are secured to the internal tread. In the internal tread there are made blind radial holes for fasts of the metal blocks. Geometrical parameters of the said holes are made in correspondence with geometric parameters of fasts of the metal blocks.

EFFECT: simplified design of clutch and facilitation of block disassembly.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to reconditioning or partial replacement of reinforcement element 10 of structure 8 of fibrous composite. Proposed method comprises the steps that follow. Placing of at least one fibrous layer 11 on part of reinforcement element surface 10 and/or, at least, one reinforcement replacement element 10 made of the same material on part fibrous composite structure reinforcement surface 8. Placing, at least, one pressure mat 4 adapted to contour of reinforcement element 10 above, at least, one fibrous layer 11 and/or, at least, one reinforcement replacement element. Note here that, at least, one pressure mat 4 thrusts against locking frame 3 and is locked as required by said frame 3 adapted to aforesaid contour of reinforcement element 10. Structure of fibrous composite 8 is supported in area opposite locking frame 3 by counter prop 5. Pressure is applied to, at least, one pressure mat 4 to press it against reinforcement element 10 and locking frame 3. Then, at least, one fibrous layer 11 and/or reinforcement replacement element 10 are cured. Invention covers also connector 1 to implement aforesaid method.

EFFECT: higher quality and accuracy of recover or replacement without application of autoclave.

13 cl, 7 dwg

FIELD: construction.

SUBSTANCE: inner surface of a tyre is polished along the perimetre of the damaged tyre section to form a surface for patch arrangement. The inner surface is polished for depth sufficient for arrangement of the reinforcing element of the tyre patch at the distance of approximately 3 millimetres or less from the damaged reinforcing element of the tyre. The damaged section is coated by application of a pre-assembled patch onto the surface for arrangement of the patch along the inner surface of the tyre. The patch includes a layer of reinforcing elements arranged between an air impermeable layer and contacting with the tyre by the patch surface. The reinforcing element of the patch is in the layer of reinforcing elements and is arranged at the distance of approximately 3 millimetres or less from the damaged reinforcing element of the tyre. The patch on the tyre is vulcanised.

EFFECT: invention allows increasing patch service life.

19 cl, 9 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to overhauling dual multilayer composite structures. Proposed method consists in overhauling composite material structure comprising first outer lining, first cellular inner layer, mid lining, second cellular inner layer and second outer lining. Note here that said method comprises replacement of sections of outer linings, mid lining and inner layers by new sections. Then, stiff pressure plate is placed on new section of the first outer lining and around it. Then, said plate is pressed against composite material structure. Then, new said sections of outer linings and mid lining are solidified. Prior to solidifying, mid lining is punctured to let air contained in first layer and second of inner part out.

EFFECT: reduced overhaul time with no deterioration in repair quality.

4 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to method of repairing outer envelopment of composite structure comprising inner cellular layer arranged between two outer envelopments of which one is to be repaired. Proposed method comprises replacement of a section of one of aforesaid outer envelopments with new section, superimposing stiff pressure form on said new section and around it, pressing it by pressure form to structure from composite material and hardening new section. Note here that, prior to hardening, the other one of said outer envelopments is punctured directly above inner layer for releasing air contained in inner layer.

EFFECT: good joint between new sections.

14 cl, 3 dwg

FIELD: repairs of hygiene equipment.

SUBSTANCE: invention relates to restoration of hygiene equipment, such as baths, shower pans and other similar articles. Proposed method includes manufacture of insert and preparation of bath to be repaired and insert for connection. Then cement and sand mix is applied to bottom of bath, and gluing substance is applied to bath walls. Insert is fitted in bath on liquid cement-sand mix and is secured on bath walls by gluing substance. Insert is pressed to bath. When insert is being pressed to bath bottom, cavities between insert and bottom of bath are filled with cement-sand mix.

EFFECT: reduced labor input, improved quality of repair.

The invention relates to the repair of products sanitary purposes, in particular, baths, sinks etc

The invention relates to the field of road transport, and in particular to equipment tire anti-skid means, and can be used with the studded tyre protectors with anti-skid spikes
The invention relates to methods of repairing plastic coatings on metal pipes
The invention relates to the field of construction, in particular to the technology of repair and reconstruction of sanitary wares, such as baths, shower trays and other similar products

FIELD: repairs of hygiene equipment.

SUBSTANCE: invention relates to restoration of hygiene equipment, such as baths, shower pans and other similar articles. Proposed method includes manufacture of insert and preparation of bath to be repaired and insert for connection. Then cement and sand mix is applied to bottom of bath, and gluing substance is applied to bath walls. Insert is fitted in bath on liquid cement-sand mix and is secured on bath walls by gluing substance. Insert is pressed to bath. When insert is being pressed to bath bottom, cavities between insert and bottom of bath are filled with cement-sand mix.

EFFECT: reduced labor input, improved quality of repair.

FIELD: process engineering.

SUBSTANCE: invention relates to method of repairing outer envelopment of composite structure comprising inner cellular layer arranged between two outer envelopments of which one is to be repaired. Proposed method comprises replacement of a section of one of aforesaid outer envelopments with new section, superimposing stiff pressure form on said new section and around it, pressing it by pressure form to structure from composite material and hardening new section. Note here that, prior to hardening, the other one of said outer envelopments is punctured directly above inner layer for releasing air contained in inner layer.

EFFECT: good joint between new sections.

14 cl, 3 dwg

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