Large-capacity radial tire

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Proposed tire features ellipticity factor equal to or under 50%. Breaker layers 9, apart from outer breaker layer 10, are arranged so that breaker layer cords are arranged at θ 10-70° relative to tire lengthwise direction. Said outer breaker layer 10 is made of coiled layer 12 of coiled tape provided with steel cords in tire lengthwise direction. Said breaker layer 10 comprises section 10A located between fold position Po on opposite sides from tire equator and fold position 10B bent in U-like manner from position Po toward tire equator. Section 10A features width varying from 70% to 80% of width of contact between tread and ground while fold section 10 B has width varying from 5.0 mm to 0.5 of width.

EFFECT: longer life.

9 cl, 8 dwg

 

The present invention relates to a heavy duty radial tire with respect to the height of the tire section width, constituting 50% or less, which suppress the increase of the outer diameter of the shoulder zones of the tread by modifying brokerage belt, thereby improving the wear resistance and the durability of the tire.

In the heavy duty radial tires used in vehicles, such as trucks and buses, brokery zone "a", located radially outside of the framework mainly consists of three or four bragarnyk layers "b" steel cords brokerage belt, as shown in Fig.7. In the traditional tire radially inner side is first brickery layer b1 of the cords brokerage belt, lying under a relatively large angle from 40° to 70 ° relative to the equator of the tire and radially outside of the first layer sequentially arranged second and third bracerie layers or from the second to the fourth bracerie layers b2-b4 of the cords brokerage belt lying at an angle from 10° to 35 ° relative to the equator of the tire. The 2nd and 3rd bracerie layers b2 and b3 are stacked so that the cords of the second layer cross the cords of the third brokerage layer. With this arrangement forms a triangular structure in which cords brokerage belts cross each other between the first and second brokername layers b1 and b2 and between the second Fretheim brokername layers b2 and b3, thereby, the rigidity brokerage belt increases, increasing the area of the tread due to the tightening effect (see, for example, JP-A-08-244407).

On the other hand, in connection with the development of high-speed highways and transport technologies with high performance using tires with a low ratio of height of the tire section width as a heavy-duty tire increases as the ratio of the height of the tire section width (the ratio of the section height/section width) is low and, therefore, stability control good. However, in the case of low relationship of the height of the tire section width, in particular tyres with regard to the height of the tire section width is 50% or less, the traditional design brokerage belt cannot exhibit sufficient bond strength, since the tread is wide and flat tread profile. Thus, due to centrifugal force, cyclic deformation when in contact with soil /stop contact with the ground, high internal pressure, etc. is the so-called increase in external diameter, wherein the outer diameter of the tread gradually increases as compared with the diameter at the initial stage of operation. In particular, the increase in external diameter becomes large in the shoulder zones of the tread. As a result, the pressure pin is regarding subsection with soil grows unevenly in the shoulder zones of the tread, causing uneven wear, and also delamination (delamination at the edges brokerage belt), starting from the axially outer edges of brokerage belt, due to aging of the rubber due to temperature increase.

Accordingly, the present invention is the provision of heavy-duty radial tire having a low ratio of height of the tire section width, amounting to a maximum of 50%, which effectively suppressed the increase of the outer diameter of the shoulder zones of the tread that provides enhanced resistance to uneven wear and durability. This goal is reached by forming radially-outer brokerage layer of helically wound layer, in which the steel cord is spirally wound in the longitudinal direction of the bus, and using for this purpose a folded structure in which both axial edges of the helically wound layer are bent back toward the equator of the tire.

In the present invention to provide a heavy duty radial tire with respect to the height of the tire section width maximum 50% and comprising a carcass extending from a tread to each side ring in the sides of the via sidewall, and brokery zone, located inside of the tread and radially outside of the carcass, in which:

specified brickery zone includes many bragarnyk layers, wojennych radial direction, in which cords brokerage belt, except for the radially-outer brokerage layer are at an angle Θ from 10 to 70° relative to the longitudinal direction of the bus, and

specified radially outer brickery layer is made of a helically wound layer formed by spiral winding of the tape, including a top layer of rubber and one or more steel cords, closed cover rubber layer, in the longitudinal direction of the bus, and

specified radially outer brickery layer contains a plot of the main part of the outer layer extends from the equator of the tire to position Ro bends layer located on both sides of the equator of the tire, and lots of bends of the outer layer, the U-shape bent in positions Rho bend layer toward the equator of the tire and passing to the inner positions Pi of the outer layer, where

the transverse width of the Cwa section of the main part of the outer layer is from 70 to 80% of the width TW of contact of the tread with the ground, and the transverse width of the CWb each of the parts of the bend of the outer layer is at least 5.0 mm and a maximum of 0.5 transverse width CWa section of the main part of the outer layer.

The term "width TW of contact of the tread with the ground", as used in this document means the maximum transverse width of the contact area with the ground of the tread contacting the planar surface when the tire is ustanavlivaut on a standard rim, pumped up to normal internal pressure and a tire under conditions of normal internal pressure then load standard load. The term "standard rim" means the rim for each bus in the system of standardization, which is based bus, and means, for example, the "standard rim" in the JATMA (Japan Association of manufacturers of automotive tires), "model bus" in the system TRA (Association for the rims and tires) and "measuring wheel" in the ETRTO (European technical organization rims and tires). The term "normal internal pressure" means an air pressure defined for each bus in the system of standardization, and means, for example, "maximum air pressure" in the system JATMA, the maximum value specified in the table "Within loads of tyres at different pressures of the cold pumping system TRA, and "inflation pressure" in ETRTO. The term "standard load" means a load defined for each bus in the system of standardization, and means, for example, "maximum load capacity" in the system JATMA, the maximum value specified in the table "Within loads of tyres at different pressures of the cold pumping" in TRA, "load capacity" in ETRTO, etc.

In the description of the sizes of the respective parts or zones of the tire mean values measured for the bus under the above conditions, n is Smolnogo internal pressure, when there is no load, unless otherwise specified.

In the heavy duty tire according to the present invention radially outer brickery layer formed of helically wound layer in which a cord spirally wound in the longitudinal direction of the tire, and helically wound layer using a folded structure in which both axial edges of the helically wound layer are bent back toward the equator of the tire.

In accordance with the studies of the applicant, in the case of heavy-duty radial tire with high internal pressure, the components of 700 kPa or more, and a low ratio of the height of the tire section width, constituting 50% or less, only by forming the external brokerage layer of helically wound layers have insufficient bond strength at the boundary areas brokerage belt, so that the increase of the outer diameter cannot be prevented in a good degree. Thus, it can be proposed location of two helically wound layers in the shoulder zones of the tread. However, on both axial edges of the helically wound layer has a large tension. As cord brokerage belt ends at the site of the beginning of the winding or plot the end of the winding on the first turn of the winding or on the last turn of the winding helically wound layer, the site of the beginning of the winding and the plot okonchan what I wound have low durability. Therefore, even if using a two-layer structure, deformation occurs at the site of the beginning of the winding or plot the end of the winding, causing damage such as a break in the cord, as the cord ends at the axially outer edge of the helically wound layer, if the plot start winding or the end of the winding is located on the axially external edge of the helically wound layer.

However, in the present invention, as helically wound layer using a folded structure, it is possible to avoid the location of the site of the beginning of the winding or portion of the end winding on the axial edges of the helically wound layer. In other words, cord brokerage belt runs continuously in the longitudinal direction, not ending the axial edges of the helically wound layers, which are bent in the opposite direction. Therefore, even in the heavy duty radial tire with respect to the height of the tire section width, constituting 50% or less, the increase of the outer diameter of the shoulder zones of the tread can be effectively prevented, thus improving the resistance to uneven wear. Moreover, delamination edges brokerage belt caused by temperature rise due to the increase in pressure contact with the soil, and break the cord on the axial edges of the helically wound layer can also be prevented, thus improving the durability.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 shows the cross-section heavy-duty radial tires, showing an embodiment of the present invention.

Figure 2 presents the cross-section, showing a portion of the tread of the tire 1 in a larger view.

Figure 3 presents a view showing the arrangement of the cord in bragarnyk layers.

Figure 4(a) and 4(B) shows views showing the method of winding the tape.

Figure 5 presents the dependence curve showing the load-elongation for cord helically wound layer brokerage belt.

Figure 6 presents a perspective view showing the tape.

Figure 7 presents a view showing the arrangement of the cord in bragarnyk layers of traditional tires.

Explanation of designations

2. Protector

3. Sidewall

4. Board

5. Bead ring

6. Frame

7. Brickery belt

9A. First brickery layer

9B. Second brickery layer

9C. Third brickery layer

9D. Fourth brickery layer

10. External brickery layer

10A. The plot of the main part of the outer layer

10V. The area of the bend of the outer layer

11. Tape

12. Helically wound layer

The embodiment of the present invention is described hereinafter with reference to the accompanying drawings.

As shown in figure 1, the heavy duty radial tire 1 has a low Rel is the solution of the height of the tire section width (the height of the tire section width/profile tyres), reduced to 50% or less, and the bus includes at least a carcass 6 extending from a tread 2 to each side of the ring 5 at the opposite sides 4 through sidewall 3, and brokery belt 7 located inside of the tread 2 and radially outside the carcass 6.

The carcass 6 comprises at least one layer 6A of the frame (in this embodiment a single layer of frame)in which the cords of the carcass are angled, for example, from 75 to 90° relative to the longitudinal direction of the tire. The carcass layer 6A consists of a main part 6A of the layer held between the side rings 5, 5 and bends layer 6b, which are continuously at both ends of the main portion 6A and bent around the bead rings 5 from the axially inside to the axially outer side of the tire. Between the main body layer 6A and each bend 6b layer is a filler 8 Board, made of rubber, to enhance Board having a triangular cross-section located radially outside from the side of the ring 5. Steel cords are preferred as the casing fabric, but can also be used cords of organic fibers, if circumstances require, for example cords of aromatic polyamide, nylon, viscose fibers and polyester fibers.

Shown in this embodiment, the filler 8 Board, made of rubber, has a two-layer structure consisting of a radially inner part 8A of the filler, made of solid rubber with a hardness of 80 to 95, and a radially outer part 8B of the filler, made of soft rubber with a hardness of 40 to 60. The height HI of the filler 8 Board, made of rubber, from the base line BL to the top is from 35 to 50% of the height BUT the profile of the tire. By using such a filler Board, made of rubber, increase lateral stiffness of the tire, improving the driving stability of the vehicle while suppressing the occurrence of damage in the top.

Brickery belt 7 includes many bragarnyk layers that are stacked on top of each other in the radial direction and in which the steel cord is used as the cord brokerage zone. Bracerie layers 9, except for the outermost brokerage layer 10 located on the outer radial side brokerage belt, placed so that the cords brokerage zone located at an angle Θ from 10 to 70° relative to the longitudinal direction of the tire.

In this embodiment shown brickery belt 7, in which bracerie layers 9A-9D and 10, from the first to the fifth, laid one on another in this order from the radially inner side to a radially outer part of the tire.

Among them, as shown in Figure 3, the first brickery layer 9A is located in the inner radial direction side brokerage belt so that the cords are under at the scrap Θ1 from 40 to 70° relative to the longitudinal direction of the tire. Second brickery layer 9B is located on the radially outer surface of the first brokerage layer 9A so that the cords are arranged at an angle Θ2 which is smaller than the angle Θ1, and is from 10 to 45° relative to the longitudinal direction of the tire. Third brickery layer 9C is located on the radially outer surface of the second brokerage layer 9B so that the cords are arranged at an angle Θ3, which is smaller than the angle Θ1, and is from 10 to 45° relative to the longitudinal direction of the bus, provided that the direction of inclination of the cords is opposite to the direction of inclination of the cords of the second brokerage layer 9B. Fourth brickery layer 9D is located radially outside of the third brokerage layer 9C so that the cords are arranged at an angle Θ4, which is smaller than the angle Θ1, and is from 10 to 45° relative to the longitudinal direction of the tire in the same direction of inclination as in the third brekina layer 9C.

The transverse width BW2 and transverse width BW3 second and third bragarnyk layers 9B and 9C, respectively, ranges from 85 to 98% of the width TW of contact of the tread with the ground. In this embodiment, as shown in figure 2, the second brickery layer 9B has the greatest width of five bragarnyk layers 9A-9D and 10. In this case, it is preferable that the difference between "BW2-BW3" between the width BW2 and width, BW3, there were at least 14 mm, in other words, tobacciana-the outer edge of the second brokerage layer 9B and the axially outer edge of the third brokerage layer 9C belt was located relative to each other at a distance L1 in the transverse direction of the tire, of at least 7 mm, thus the stress concentration at the outer edges of the second and third bragarnyk layers 9B and 9C may be reduced.

If the width of the width BW2 BW3 is less than 85% of the width TW of contact of the tread with the ground, the tread stiffness is insufficient in the shoulder zones of the tread, and, accordingly, will not receive a high driving stability. If the width of the width BW2 BW3 is more than 98%, the gap between the axially outer edges bragarnyk layers 9B and 9C and the surface of the protrusion becomes too small, which can lead to cracking, starting from the outer edges. From this point of view, it is preferable that the transverse width BW1 of the first brokerage layer 9A ranged from 85 to 98% of the width TW of contact of the tread with the ground. Fourth brickery layer 9D has the smallest width BW4 of the five bragarnyk layers 9A-9D and 10 and serves to protect the first to the third bragarnyk layers 9A-9C and frame 6 from external damage. Fourth brickery layer 9D may be excluded if necessary.

Fifth brickery layer 10, namely, the outermost in the radial direction brickery layer 10 formed in the form of a helically wound layer 12 obtained spiral and longitudinal winding of the tape 11 (shown in Fig.6), in which one or many steel cords as the cords 10C brokerage belt, for example -10 cord 10C, protected by a top layer of rubber G. Therefore, in the external brekina layer 10 cords 10C brokerage belt set at an angle of essentially 0° relative to the longitudinal direction of the tire. The tape 11 is wound in such a way that the side edges 11th tape 11 at the adjacent coils in contact with each other or are at a distance from each other. The width SW of the tape 11 is less than the specified hereinafter transverse width CWb plot 10V bend external brokerage layer 10. Typically, the width SW is from 2 to 35 mm

External brickery layer 10 formed in the form of a folded structure, as shown in Figure 3, so that the layer includes section 10A of the main part of the outer layer extends from the equator of the tire to the position Ro bend layer located on both sides of the equator With tires, and lots 10V, 10V bends of the outer layer, which U-shaped bent in positions Rho bend layer toward the equator From the bus and walked to the internal positions Pi of the outer layer.

It is important that the edge Es of the beginning of the spiral winding and the edge of the end of the spiral winding of the tape 11 are not located in positions Ro bending of the outer layer. For this purpose, in this embodiment only the tape 11 is spirally wound as shown in Figure 4(A), from "internal positions Pi1 outer layer on one side" to the "position Re bend the outer layer on one side, then to the "position PO2 bend the outer layer of the other side," and, finally, to the "internal position Pi2 outer layer on the other side" in this order, whereby the edge of the Es start winding and the edge of the end winding can be located on the inner positions Pi1 and Pi2 layer on one side and on the other hand, respectively. In this case, the plot W bend the outer layer on one side is bent back radially inward relative to section 10A of the main part of the outer layer, and the plot W bend the outer layer on the other hand is bent back radially outward relative to section 10A of the main part of the outer layer.

Moreover, as shown in Figure 4(B), helically wound layer 12 may also be formed using two tapes 11, 11. In this case, each tape 11 is spirally wound from the equator To the bus" to "position Ro bend the outer layer" and then to "internal position Pi of the outer layer, whereby the edge of the Es start winding and the edge of the end winding can be located on the equator With tires and inner positions Pi layer, respectively. Thus, the plot W bend the outer layer on one side and the plot W bend the outer layer on the other side are bent back radially outward relative to section 10A of the main part of the outer layer.

In brekina belt 7, is designed so that external brickery layer 10 made of spiral wound with the HHS 12, received helical winding of the tape 11, and has a folded structure so that both edges of the helically wound layer 12 are bent back toward the equator of the tire.

Therefore, the lack of adhesion forces brokerage belt in the shoulder zones of the tread can be strengthened by two layers: section 10A of the main part of the layer and the plot 10V auxiliary part of the external brokerage layer 10, to effect retraction in a wide range. Thus it is possible to uniformly suppress the increase of the outer diameter in the tread, and, in addition, it is possible to prevent the occurrence of uneven wear due to the increase of the outer diameter and the separation region brokerage zone. Moreover, as the helically wound layer 12 is formed in the form of a folded structure, cords 10C brokerage belt are continuously in the longitudinal direction on the axial edges of the helically wound layers, which represent the position of the Ro bend the outermost layer, not ending in these positions. Consequently, it is possible to prevent damage to brokerage belt, such as a break in the cord brokerage belt in position Ro bend the outermost layer, compared with the case where two bragarnyk layer simply laid one on another, and durability can be comprehensively improved.

To achieve these effects n is necessary, to the transverse width of the CWa section 10A of the main part of the outer layer ranged from 70 to 80% of the width TW of contact of the tread with the ground, and the transverse width of the CWb each plot 10V bend the outer layer comprised of at least 5.0 mm and a maximum of 0.5 transverse width CWa section 10A of the main part of the outer layer.

If the width of the CWa section 10A of the main part of the outer layer is less than 70% of the width TW of contact of the tread with the ground, the effect of tightening is evident not enough on the entire surface of contact of the tread with the ground, and, consequently, increasing the outer diameter of the shoulder zones of the tread cannot be suppressed. If the width of the CWa is more than 80% of the width TW of contact of the tread with the ground, the voltage at position Ro bend the outer layer becomes too large, so that can easily rupture the cord helically wound layer 12.

If the width of the CWb site 10V bend the outer layer is less than 5 mm, the effect of the folded structure, will not be sufficient, so that the increase of the outer diameter will not be sufficiently suppressed and, moreover, can easily rupture the cord helically wound layer 12. If the width of the CWb is more than 0.5 transverse width CWa section 10A of the main part of the outer layer, portions 10B bend layer overlap each other, forming three layers is on the side of the tire equator. Thus the balance of the adhesion forces is disturbed, reducing the resistance to uneven wear, and it also adversely affects the cost and efficiency of production. From this point of view, it is preferable that the width of the CWb was at least 15 mm, especially at least 30 mm, the width CWa greater than the width SW of the tape 11.

When brickery belt 7 further comprises a fourth brickery layer 9D, the fourth brickery layer 9D is located so that its both axial region located axially inside between the inner positions Pi of the outer layer, thereby changing the thickness brokerage belt 7 due to plot 10V bend the outer layer may be reduced.

The use of steel cords as the cords 10C helically wound layer 12 causes defects forming for the reason that stretching during vulcanization provided is not enough. Therefore, it is preferable to use as the cord 10C cord with two areas of elasticity, such as shown in Figure 5, the curve "f" (load-elongation) for Korda curve has a region f1 low elasticity between the origin 0 of the coordinate point P of inflection of the curve and the region f2 high elasticity, located at point P of inflection of the curve. Such characteristics are obtained by making the cord 10C of the many wires that includes IU is greater least one profiled wire in the form of waves (including jigsaw), spiral or other Point P of inflection of the curve is determined by the point of intersection of the curve f and the normal dropped from the point RO of intersection of the extension line of the curve zone f1 low elasticity and the extension line of the curve zone f2 high elasticity. Preferably, the elongation at the point P of the curve ranged from 2.0 to 3.0% and the load at the point P of the curve ranged from 30 to 200 N, thereby stretching during vulcanization can be ensured sufficiently. Preferably helically wound layer 12 had such physical properties as tensile strength E tensile cord 10C in the layer 12 was from 1830 to 3830 N, and the strength of the S layer, which is a product of tensile strength E when the tension on the number of cords Nc 5 cm width of the layer 12 (S=E×Nc), ranged from 50500 to 78500 N. If the tensile strength of E with stretching and strength of the S layer is lower than the above range, helically wound layer has insufficient strength and rupture of the cord can easily occur at position Ro bending of the outer layer.

Application design brokerage belt, above, leads to the possible release of edge cord (striping edge brokerage belt) on the axially outer edge areas of the second and third bragarnyk layers 9B and 9C, which extends axially outward from the coiled layer 12. So about what atom, in this embodiment, as shown in figure 2, the protective layers 15 of rubber is positioned between the axially outer edge areas of the second and third bragarnyk layers 9B and 9C, so that the peripheries of the third brokerage layer 9C are from the second brokerage layer 9B on the distance L2 from 3.0 to 4.5 mm, Each of the protective layers 15 made of rubber rubber with a low elasticity with complex elastic modulus E*1 from 6.0 to 12.0 MPa. If the distance L2 is less than 3.0 mm, or if the complex elastic modulus E*1 exceeds 12,0 MPa, a protective layer 15 of rubber has insufficient impact on the decrease in the concentration of shear stresses at the boundary areas of the second and third bragarnyk layers 9B and 9C, and the release of the edge of the fabric at the boundary areas brokerage belt will not be prevented. On the other hand, if the distance L2 is greater than 4.5 mm, or if the complex elastic modulus E*1 is less than 6.0 MPa, the movement of the ends of the cord becomes large, which leads to the relief of the possible release of the edge of the fabric.

The axially outer peripheries of the first and second bragarnyk layers 9A and 9B are separated from the frame 6, and the distance between them gradually increases in the direction axially outward of the tire. Preferably in each of these intervals J between brokername layers and the frame is cushioning rubber 16 PR is approximately triangular cross-section, in order to suppress the occurrence of damage at the edges bragarnyk layers 9A and 9B. Cushioning rubber 16 has a complex elastic modulus E*2 from 2.0 to 5.0 MPa and satisfies the relation E*2<F*1.

Although the preferred embodiment of the present invention is described with reference to the drawings, it should be understood that this invention is not limited to such embodiments and may be made of various changes and modifications.

EXAMPLES

Heavy-duty radial tire with a low ratio of height of the tire section width, size 435/45R22,5 and the structure presented in figure 1, were made on the basis of the specifications shown in table 1, and tested and evaluated the increase in external diameter, the resistance to uneven wear and the durability of the tire (striping edge brokerage belt, break cord brokerage belt). The results are presented in table 1.

In the examples and comparative examples, the angles of the cords brokerage belt were the same, and the cord angle Θ1 of the first brokerage layer was +50°, the cord angle Θ2 of the second brokerage layer was +18°, the cord angle Θ3 of the third brokerage layer was -18°, and the cord angle Θ4 of the fourth brokerage layer was -18°. In helically wound layer of the tensile strength F tensile cord brokerage belt was 2830 N and the strength of the layer was 64524 N. Over the CSOs, as for the cord in a coiled layer, the elongation and the load at the point of inflection of the curve of load-elongation was 2.3% and from 30 to 200 N, respectively. The complex elastic modulus E*1 protective rubber layer represented 10.3 MPa, and a complex elastic modulus E*2 amortization of rubber were 9.3 MPa.

The increase in external diameter

Using a rotating test drum, the tire was tested in run for 25 hours under conditions of rim 22,5×14,00, the internal pressure of 900 kPa, load 41,68 kN and a speed of 40 km/h After the run was measured by the increase in the outer diameter of the tire on the tread surface and received the maximum amount.

The resistance to uneven wear

Each tire mounted on the rim size of 22.5×14,00), was pumped to the internal pressure of 900 kPa, were installed on all wheels of the test vehicle 2-D4 and tested with full mileage of 10,000 km of roads, including expressways, urban roads and mountain roads. After the run we measured the depth of the shoulder grooves. The results are presented in the form of the metric, based on the results of comparative example 1 taken as 100. The higher the value, the better the resistance to uneven wear.

Stratification of the region brokerage belt

After a test run to measure the resistance to uneven wear of the tires is dismantled and examined for the presence of delamination edge brokerage zone. In case of detection of delamination edge brokerage belt measured the length of the bundle.

Gap Korda brokerage belt

After a test run to measure the resistance to uneven wear of the tire was disassembled and examined for the presence of a rupture of the cord at the boundary areas helically wound layer.

From table 1 it is seen that in the tires of examples suppressed the increase in external diameter and enhanced resistance to uneven wear and durability.

Table 1
EUR. Approx. 1Approx. 1EUR. Approx. 2EUR. Approx. 3EUR. Approx. 4Approx. 2Approx. 3EUR. Approx. 5EUR. Approx. 6
The width BW1 of the layer (*1)0,910,910,910,910,910,910,910,910,91
The width BW2 of the layer (*1) 0,970,970,970,970,970,970,970,970,97
Width BW3 layer (*1)0,920,920,920,920,920,920,920,920,92
Width BW4 layer (*1)0,440,500,500,500,690,50-0,690,50
The presence of a helically wound layerno
The presence of stretch bendno no*2
The width of the CWa(*1)-0,710,850,60,710,710,710,710,71
Width CWb (mm)-406719440135040
The distance L1 (mm)101010101010101010
The distance L2 (mm)3,53,53,53,5 2,53,53,53,53,5
The increase in external diameter (mm)41,51,52,22,51,51,52,71,5
The resistance to uneven wear100150150100100150150100150
Stratification of the region brokerage beltnonononono10 mm10 mmnono
Gap Korda brokerage beltnononono nonono
*1: the ratio of the width of the layer to the width TW of contact of the tread with the ground
*2: other helically wound layers used instead of plots bends (where the start winding and the end of the winding were on the edges of the layer)

1. Heavy-duty radial tire with respect to the height of the tire section width, amounting to a maximum of 50%, comprising a frame extending from the tread to each side ring in the sides of the via sidewall, and brokery zone, located inside of the tread and radially outside of the specified frame, in which:
specified brickery zone includes many bragarnyk layers stacked in the radial direction in which the cords brokerage belt, except for the radially-outer brokerage layer are at an angle Θ from 10 to 70° relative to the longitudinal direction of the bus, and
specified radially outer brickery layer is made of a helically wound layer formed by spiral winding of the tape, including a top layer of rubber and one or more steel cords, closed cover rubber layer, in the longitudinal direction of the bus, and
specified radially externally the th brickery layer contains a plot of the main part of the outer layer, passing from the equator of the tire to position Ro bends layer located on both sides of the equator of the tire, and lots of bends of the outer layer, the U-shape bent at the specified positions Rho bend layer toward the equator of the tire and passing to the inner positions Pi of the outer layer, where
the transverse width of the CWa specified portions of the main part of the outer layer is from 70 to 80% of the width TW of contact of the tread with the ground, and the transverse width of the CWb each of these sections of the bend of the outer layer is at least 5.0 mm and a maximum of 0.5 transverse width of the CWa specified portions of the main part of the outer layer.

2. Heavy-duty radial tire according to claim 1, in which one of the specified sections of the bend of the layer is bent radially inward from the specified section of the main part of the layer, and the other is bent radially outward from the specified section of the main part of the layer.

3. Heavy-duty radial tire according to claim 1, in which the transverse width of the CWa specified portions of the main part of the outer layer is greater than the width SW of the specified tape.

4. Heavy-duty radial tire according to claim 1, in which bracerie layers, except as provided radially outer brokerage layer include first brickery layer located on the inner radial direction side in which the cords are arranged at an angle Θ1 from 40 to 70° relative to the longitudinal what about the direction of the tire, second brickery layer located radially outside of the specified first brokerage layer in which cords are arranged at an angle Θ2 which is smaller than the angle Θ1, and is from 10 to 45° relative to the longitudinal direction of the bus, and the third brickery layer located radially outside of the second brokerage layer in which cords are arranged at an angle Θ3, which is smaller than the angle Θ1, and is from 10 to 45° relative to the longitudinal direction of the tire, with the tilt direction opposite to the direction of inclination of the cords of the specified second brokerage layer, and the transverse width BW2 and transverse width BW3 these second and third bragarnyk layers respectively comprise from 85 to 98% of the width TW of contact of the tread with the ground.

5. Heavy-duty radial tire according to claim 4, in which the axially outer edge of the specified second brokerage layer and the axially outer edge of the specified third brokerage layer are away from each other at a distance of at least 7.0 mm in the transverse direction of the tire.

6. Heavy-duty radial tire according to claim 4 or 5, in which the specified brickery belt further includes a fourth brickery layer between the specified third brakeman layer and the specified section of the main part of the outer layer, and the axially outer edge of the specified fourth brokerage layer are called axial seamount is but inside between the inner positions Pi of the specified outer layer.

7. Heavy-duty radial tire according to claim 1, in which cord brokerage zone in the specified external brekina layer has a tensile strength E at a stretching from 1830 to 3830 N, and the specified external brickery layer has a strength S layer from 50500 to 78500 N, where the strength of the S layer is the product of the tensile strength E in tension and the number of cords Nc 5 cm width of the layer 12 (S=E×Nc).

8. Heavy-duty radial tire according to claim 1, in which the cord of the specified external brokerage layer is characterized by a curve of the load-elongation zone of low elasticity between the origin and the point of inflection and the zone of high elasticity for the inflection point, and elongation at the point of inflection is from 2.0 to 3.0%, and the load at the point of inflection is from 30 to 200 N.

9. Heavy-duty radial tire according to claim 1, in which the width SW of the specified tape is less than the transverse width of the CWb each of these sections of the bend of the outer layer.



 

Same patents:

FIELD: transport.

SUBSTANCE: tire incorporates, at least, one reinforcing carcass-type structure made up of reinforcing elements attached, on every tire side, to the bead, the said bead base being arranged on the rim flange. Every bead has its side strip extending radially outward towards the tread. The rim reinforcing structure is arranged under the tread, made up of, at least one layer of reinforcing elements comprising, at least, one continuous reinforcing cord making, in the aforesaid layer, the sections forming, along with the lengthwise direction, equal angles to be measured at the points of intersection with the circumference plane and making from 10° to 80°. Here note that two adjoining sections are jointed by a loop.

EFFECT: higher quality of tire.

20 cl, 6 dwg

Pneumatic tire // 2405682

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly to heavy-duty radial pneumatic tires of relatively small size ratios. Tire comprises toroidal carcass arranged atop two tire beads, undertread band arranged on outer side along carcass radial direction, and tread arranged on outer along radial direction of undertread belt. Undertread belt comprises at least one circular layer arranged on outer side along radial direction of carcass rim part and made up of multiple rubberised cords running along the tire equatorial axis, and at least two inclined layers of undertread belt arranged on circular layer of undertread belt, each being formed by multiple rubberised cords running inclined to tire equatorial axis O. Width of undertread belt circular layers makes at least 60% of the tire total width. Width of at least one inclined layer of undertread belt exceeds that of circular layer. Note that elasticity modulus of the first cords arranged on outer side of undertread belt circular layer is smaller than that of second cords arranged on inner side, across direction of the first cords.

EFFECT: longer life.

10 cl, 3 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Air tire has breaker structure that comprises first breaker layer (51), second breaker layer (52) arranged in radial-inner position relative to first breaker layer (51), third breaker layer (53) arranged in radial inner position relative to first (51) and second (52) breaker layers. Every breaker layer (51, 52, 53) comprises multiple elongated reinforcing elements arranged above 1st, 2nd and 3rd breaker angles. Note here that 1st and 2nd angles vary from 15 to 40 degrees. Second angle has opposite sign relative to 1st breaker angle. Third breaker angle features magnitude varying from 40 to 90 degrees and opposite sign with respect to second angle. Breaker structure comprises also breaker layer (54) arranged at zero degree angle relative to 1st breaker layer (51) comprising elongated reinforcing elements arranged to make, in fact, zero breaker angle,.

EFFECT: perfected performances.

21 cl, 11 dwg

FIELD: transport.

SUBSTANCE: proposed pneumatic tire incorporates a carcass and a tread formed by, at least, two tread layers made up of rigid reinforcing elements with alternating crossed-over layers forming, with the peripheral direction, the angles varying from 10° to 45° on the tread crown zone. The said tread crown zone is jointed to two beads by side walls. The tread side thickness-to-tread center thickness ratio makes below 1.20 and the tread crown zone-to-tire total width ratio exceeds or equals 0.89.

EFFECT: higher strength and reliability.

25 cl, 5 dwg

FIELD: transportation.

SUBSTANCE: invention is attributed to pneumatic tire for which factor of H/S type has value exceeding 0.55 and which has radial reinforcement of frame and contains flange reinforcement formed by at least two flange working layers created of inextensible reinforcing elements intercrossing from one layer to another forming with circumferential direction the angles in the range of 10 to 45°. Tyre tread connected with two beads by means of two sidewalls is located over this radial frame reinforcement in radial direction. Crest reinforcement contains at least one layer of circumferential reinforcing elements. Value of ratio of crest block width at the end of shoulder area to crest block width at center circumferential plane is less than 1.20, and value of ratio of axial width of at least one layer of circumferential reinforcing elements to axial width of tire tread exceeds 0.5 and preferably exceeds 0.6.

EFFECT: tire strength and reliability is improving.

23 cl, 5 dwg

FIELD: transportation.

SUBSTANCE: invention is attributed to pneumatic tire which has radial reinforcement of frame and contains crest reinforcement formed by at least two crest working layers created of inextensible reinforcing elements intercrossing from one layer to another forming with circumferential direction the angles in the range of 10 to 45°. Tire tread connected with two beads by means of two sidewalls is located over this radial frame reinforcement in radial direction. Crest reinforcement contains at least one layer of circumferential reinforcing elements which has axial width less than axial width of at least one of crest working layers. Ratio of axial width of at least one layer of circumferential reinforcing elements to axial width of tire tread is equal to value which exceeds 0.6 and preferentially exceeds 0.65. Ratio of tire tread axial width to maximum axial width of this pneumatic tire is equal to value exceeding 0.89.

EFFECT: tire strength and reliability is improving.

17 cl, 5 dwg

FIELD: transport engineering.

SUBSTANCE: invention relates to pneumatic tyre with radial carcass reinforcement over which ridge reinforcement consisting of at least two working layers of ridge formed by metal reinforcement members is arranged in radial direction. Said reinforcement members intersect from one layer to the other forming angles of 10 to 35° with circumferential direction. Ridge reinforcement includes at least one additional reinforcement formed by metal reinforcement members orientated in circumferential direction. Additional reinforcement consists of at least two layers of metal members of small diameter not exceeding 0.6 mm. Metal reinforcement members of additional reinforcement are assemblies, type 1 x n where n is from 2 to 5, made of steel featuring high breaking strength SHT, and diameter of threads is within 12/100 and 30/100.

EFFECT: increased strength and wear resistance of tyres.

10 cl, 3 dwg

FIELD: automotive industry.

SUBSTANCE: proposed pneumatic tire has crown, two side strips and two beads as well as carcass reinforcement secured in each bead and crown reinforcement provided with working unit and protective unit form inside to outside in radial direction. Protective unit contains at least one layer of parallel reinforcement circumferentially orientated elements. Layer of protective unit is formed by reinforcement elements made of aromatic polyamide with initial modulus of elasticity not less than 1000 cN/tex and breaking strength exceeding 65 cN/tex.

EFFECT: increased strength of pneumatic tire crown.

20 cl, 5 dwg

FIELD: road vehicles.

SUBSTANCE: proposed tire has radial body with one or several breaker layers on place close to outer surface, and strengthening layer with nylon cord wound in spiral over breaker. It is desirable that tread belt of tire be formed by underlayer and outer layer, one placed on the other, elasticity and/or hardness characteristics of first layer remaining stable at temperatures within 20 and 110oC.

EFFECT: improved performance characteristics of tires.

23 cl, 4 tbl, 2 dwg

The invention relates to the automotive industry

The invention relates to road transport

Tire case // 2422291

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to design of truck radial tires. A case contains tread, breaker consisting of metal-cord and textile layers, casing, sidewalls and bead rings. Metal cord diameter is 0.77-0.85 mm. The metal cord itself is made of metal fibers with equal diameter, and the ratio of metal fiber to metal cord diameter is 0.330-0.410. The ratio of metal cord in rubber-covered breaker layer to metal cord is 2.057-2.743, and linear density of metal cord lays within the range of 2.12-2.34 g/m. Herewith, the thickness of each rubber-covered metal cord layer in breaker is 1.25-1.45 mm, and tensile strength of metal cord is not lower than 875±5 N.

EFFECT: material, labor and energy consumption of tire manufacturing is lowered.

2 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Air tire has breaker structure that comprises first breaker layer (51), second breaker layer (52) arranged in radial-inner position relative to first breaker layer (51), third breaker layer (53) arranged in radial inner position relative to first (51) and second (52) breaker layers. Every breaker layer (51, 52, 53) comprises multiple elongated reinforcing elements arranged above 1st, 2nd and 3rd breaker angles. Note here that 1st and 2nd angles vary from 15 to 40 degrees. Second angle has opposite sign relative to 1st breaker angle. Third breaker angle features magnitude varying from 40 to 90 degrees and opposite sign with respect to second angle. Breaker structure comprises also breaker layer (54) arranged at zero degree angle relative to 1st breaker layer (51) comprising elongated reinforcing elements arranged to make, in fact, zero breaker angle,.

EFFECT: perfected performances.

21 cl, 11 dwg

FIELD: tire industry.

SUBSTANCE: invention relates to tire with radial reinforcement of carcass for use on heavy vehicles, such as transport or construction and road-building machines. It relates to tire with axial width exceeding 37 inches. According to invention, tire has working reinforcement crown consisting of at least two uninterrupted working layers and terminating from each side of circumferential (equatorial) middle plane in at least two half-layers whose metal reinforcement members form angles exceeding minimum angle which is formed by reinforcement members of uninterrupted layers relative to circumferential direction. Half-layer passing in axial direction outwards further than other half-layers is in contact with widest in axial direction uninterrupted layer in crown, and two half-layers cover in radial direction axially outer end of said working layer widest in axial direction.

EFFECT: increased service life of tire.

8 cl, 4 dwg

FIELD: tire industry.

SUBSTANCE: invention relates to design of automobile tires, particularly to those used in construction vehicles. proposed reinforcement pack N of pneumatic tire contains reinforcement member embedded in converting materials and it includes first layer C1 and second layer C2 of metal elements E1, E2 parallel to each other and embedded into covering materials M1, M2 and third layer C3 of elements E3 made of textile material is placed between two layers C1 and C2, third layer being embedded into covering material M3. Textile elements E3 are orientated relative to elements E1 and E2 at angle within 70° and 110°.

EFFECT: increased strength of tires.

7 cl, 4 dwg

FIELD: automotive industry; tire industry.

SUBSTANCE: invention relates to tires for machines used in civil engineering. Proposed tire has radial carcass reinforcement 1 second in each bead by means of ring reinforcement member of bead and radially upper crown reinforcement containing at least two working layers of non-stretchable metal cord with intersecting threads of layers, width of said layers is at least 50% of tread width L, and radially upper two protective layers along crown made of so-called elastic metal cord with intersecting threads of layers. Tread includes, in its grooveless part of thickness D, at least one reinforcement made of strengthening members. Said reinforcement consists of at least two layers of textile monofiber whose threads are parallel in each layer. Axial width of said layers is at least equal to width of most narrow working layer.

EFFECT: increased strength of crow of pneumatic tire.

4 cl, 1 dwg

FIELD: automotive industry.

SUBSTANCE: proposed pneumatic tire has crown, two side strips and two beads as well as carcass reinforcement secured in each bead and crown reinforcement provided with working unit and protective unit form inside to outside in radial direction. Protective unit contains at least one layer of parallel reinforcement circumferentially orientated elements. Layer of protective unit is formed by reinforcement elements made of aromatic polyamide with initial modulus of elasticity not less than 1000 cN/tex and breaking strength exceeding 65 cN/tex.

EFFECT: increased strength of pneumatic tire crown.

20 cl, 5 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker consisting of metal cord and textile layers, carcass, side strips and bead rings. Diameter of metal cord is from 0.83 to 0.91 mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.280 to 0.331. ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.978 to 2.168, and linear density of metal cord lies within 2.64 and 2/96 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.538 to 1.839, and breaking strength of metal cord is not lower than 855±5N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyre.

2 dwg

FIELD: automotive industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 0.87 to 0.97mm. Metal cord proper is made of metal threads of equal diameter, ratio of diameter of metal thread to diameter of metal cord being from 0.242 to 0.293. Ratio of pitch of metal cord in breaker to diameter of metal cord is from 1.85 to 2.076, and linear density of metal cord lies within 2.84 and 3.16 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 1.62 to 1.85, and breaking strength of metal cord is not lower than 955±5N.

EFFECT: reduced materials usage, labour input and power consumption at production of tyres.

2 dwg

FIELD: automatic industry; tyre industry.

SUBSTANCE: invention relates to design of radial-ply tyres for trucks. Proposed tyre casing contains tread, breaker, carcass, side strips and bead rings. Diameter of metal cord is from 1.14 to 1.26 mm. Metal cord proper is made of equal-diameter metal threads, ratio of metal thread diameter to diameter of metal cord being from 0.253 to 0.298. Ratio of breaker metal cord pitch to diameter of metal cord is from 1.9 to 2.25, and linear density of metal cord lies within 5.0 and 5.5 g/m. Ratio of thickness of each rubber-lined layer of metal cord in breaker to diameter of metal cord is from 0.35 to 1.49, breaking strength of metal cord being not lower than 1715±5N.

EFFECT: reduced materials usage, labour input and energy consumption at production of tyres.

2 dwg

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