Pneumatic tire

FIELD: transport.

SUBSTANCE: tire with preset sense of rotation comprises treads. Parts of said treads are composed by multiple inclined grooves extending from both edges of the tread to its equatorial line and inclined to direction of rotation relative to tread width direction. Tread branched grooves, each extending from the part of inclined groove located some 1/4 of tread width from tread edge and directed inward over tread width. It is directed to tire equatorial line in tire circumference opposite the direction if tire circumference whereat inclined grooves are located relative to tread width to terminate in tread block.

EFFECT: higher resistance to abrasive wear.

4 cl, 2 dwg, 1 tbl

 

The present invention relates to having an increased service life of the pneumatic tire, particularly a pneumatic tire for construction vehicles used on construction sites, in mines, etc., through the optimization of the tread pattern in such a way as to increase its resistance partial wear without deterioration of its characteristics of heat dissipation.

As for tires for large construction machines used in mines, etc., there were a problem whereby that early wear and tear, in particular, lateral parts of approximately 1/8 to 1/4 of the width of the tread from the edges of the protector served as a cause of partial wear. Tires of this type are usually provided with cross tread in a crown area of the carcass with an outer side in the radial direction of the tire, and the cross-belt is made by laminating at least two of the inclined belt layers, made of several cords, long inclined relative to the Equatorial plane of the tire, in the direction in which these cords are crossed inside of inclined cross-breakers. When the tire, provided with cross breaker of this type, rotates under load, the contact area of the tread with the ground cross-Brecker deformed and it is a so-called pantograph p�the displacements, wherein the angles of intersection of the cords of the different laminated layers are changed relative to each other. During deformation of a cross-belt, the deformation of the rubber at the contact point with the ground with a number of modes of operation of the protector, in which the road surface in the tread and then quitting it. This deformation of rubber is particularly characteristic of the above-mentioned lateral parts of the tread, so that the slippage of the rubber is increased when the output of the road surface from the tread. It results in early wear of these lateral parts of the tread.

To improve the wear resistance of the tire is usually applied countermeasure consists in increasing the thickness of tread rubber to increase durability and reduce wear. However, this countermeasure increases the amount of tire tread that can degrade heat dissipation and cause problems with heat, etc.

In addition, in patent document 1 is disclosed a method of suppressing the deformation of the tread rubber in the width direction of the tire and, therefore, wear resistance of the tire from edge to 1/4 tread width of the tread and its peripheral parts (the so-called parts from 1/4 width), as a way to prevent partial wear, by placing narrow grooves around the circumference of the tire in settings�mi 1/4 of the width of the tread to the outer side of the tire in the width direction of the tire, in addition to several transverse grooves disposed at intervals in the circumferential direction of the tire and extending in a direction across the width of the tire.

The document of the prior art

Patent document 1: WO 2006/013758 A1

However, despite the fact that the pneumatic tire disclosed in patent document 1, reduced slippage caused by the deformation of the tread rubber in the width direction of the tire, it did not account for slippage in the circumferential direction of the tire. Thus, the absolute resistance tires partial wear has not yet provided a comprehensive manner.

Thus, the objective of the present invention is to provide pneumatic tires with high partial resistance to wear by optimizing the tread pattern so as to effectively reduce the portion of the tread that are reflected in parts of the tread width from 1/4 in the direction both on width and around the circumference of the tire, without compromising the heat dissipation characteristics of the tread.

The object of the present invention is to eliminate the above problems.

That is, according to the present invention provides a pneumatic tyre with a given direction of rotation, comprising treadmills tread portion which is formed with a plurality of inclined grooves, leaving your�them from both edges of the tread respectively to the Equatorial line of the tire tilted in the direction of rotation relative to the direction of the width of the tire, and also contains branched grooves, each of which departs from the inclined portion of the groove being in the range of up to 1/4 of the width of the tread from the edge of the tread inward in the width direction of the tire, and directed towards the Equatorial line of the tire in the circumferential direction of the tire opposite to the circumferential direction of the tire, which are inclined grooves relative to the direction of the width of the tire, and ends in a block of the treadmill tread.

Used here, the term "direction of rotation" of the tire means the direction in which the tire rotates, mounted on the vehicle during its movement. In addition, as used herein, the term "edge protector" means more distant from the center (in the direction across the width of the tire in contact with ground tread, pneumatic tire mounted on a standard rim specified in the "ANNUAL list of the JATMA (the Association of manufacturers of automotive tires Japan", pumped up to 100% of the internal pressure of the air (i.e., up to a maximum internal pressure) corresponding to maximum load (the load indicated in bold in the corresponding table that lists the values of the internal pressure and the corresponding values of the load) the applicable normal size/ply rating of the tire according to the "ANNUAL FAIR�ECNICO JATMA", at which the bus operates maximum allowable load (hereinafter defined as the "specified conditions"). It should be noted that when using the TRA standards or ETRTO (European technical organization for tire and rim) in the place of operation or production data are used, the appropriate standards. Further, used in the present invention, the term "tread width" means the distance between both edges of the tread, measured in the direction across the width of the tire. It should also be noted that in contact with earth under given conditions bifurcated grooves are closed.

The presence of inclined grooves inclined in the direction of rotation, enables the suppression of the mode of operation of tread rubber of the tire in the width direction of the tire that occurs during the deformation of the belt, and, thus, provides the possibility of reducing the phenomenon of slippage of the rubber. In addition, the branched grooves extend from parts of the inclined grooves in the area located within 1/4 of the width of the tread from the edge of the protector, are to the Equatorial line of the tire in the circumferential direction of the tire opposite to the direction in which are inclined grooves relative to the direction across the width of the tire, and in the end blocks of the tread, so that upon contact of the tread with the ground �farmacia treadmills occurs along the helical grooves. Therefore, the deformation of the tread rubber in the circumferential direction of the tire, as in the above-mentioned deformation of the belt decreases. As a result, it suppresses the phenomenon of slip. In particular, accelerates the movement of the tread rubber, the inside width of the tire from the branched grooves in the direction toward the outer side of the width of the tire, resulting in suppressed partial wear caused by the above-mentioned mode of operation of the rubber in the width direction of the tire that occurs during deformation of the broker. In addition, the bifurcated ends of the grooves (ejector side blocks of the treadmill tread) in contact with the ground deformation of the tread rubber on both sides bifurcated grooves occurs in such a way that the elements of the deformation in the width direction of the tire mutually compensate each other. The elements of the deformation in the circumferential direction of the tire, the deformation elements having the same direction, occur on both sides of branch grooves, and these deformation elements meet and are joined to the end edges of the bifurcated grooves, resulting in compensation of the deformation elements in the circumferential direction of the tire, resulting from the above-mentioned deformation of the belt. Due to the above, partial wear, �astnosti, in the region of the side parts of the tread caused by the above-mentioned deformation of the belt, it becomes possible to suppress.

In addition, it is preferable that the shortest distance between the branch groove and the slant groove located near the end opposite to the rotation direction (rear side), ranged from 15% to 30% of the width of the tread, which provides more reliably reduce the phenomenon of slippage of the rubber. If the shortest distance between the branch groove and the adjacent inclined grooves on the other side relative to the direction of rotation is less than 15% of the width of the tread, it becomes impossible to ensure sufficient deformation of the rubber in the circumferential direction of the tire in the bifurcated end of the groove and thus suppressing partial wear of the tire is impossible. In addition, if the shortest distance between the branch groove and the adjacent inclined grooves on the other side relative to the direction of rotation is less than 15% of the width of the tread, the deformation of the rubber in the width direction of the tire that occurs on the inner side branch grooves, and thus suppressing partial wear is impossible. Used here, the expression "the shortest distance between the bifurcated kanashii inclined groove, located next to the side opposite the rotation direction (rear side)" refers to the shortest distance between the boundary lines, one of which is formed between the bifurcated groove and a treadmill tread in the tread bifurcated groove, and the other formed between the inclined groove and a treadmill inclined groove located near the bifurcated groove on the side opposite the direction of rotation of the tire.

Also preferably, the point at which all branched grooves extend from the inclined grooves, was located in the area to 1/16 of the width of the tread from the edge of the tread in the width direction of the tire that makes it possible to more reliably reduce the phenomenon of slippage of the tire.

Also preferably, the angle of the branched grooves to the tire width direction ranged from 30° to 60°, which makes it possible to provide the equilibrium deformation of the rubber in the directions of width and around the circumference of the tire, thus providing an overall reduction of partial wear.

In addition, it is preferable that the angle of inclination of the inclined grooves relative to the direction of the width of the tyre is in the range from 5° to 45°.

Oblique grooves preferably extend from the edge of the tread, at least on 3/10 width of the tread inward in the direction �about the width of the tire, and the width of the inclined grooves is preferably from 10% to 30% of the width of the tread. In addition, the depth of the inclined grooves is preferably from 60% to 90% of the thickness of the tread rubber. Used in the present description, the term "thickness of the tread rubber" denotes the distance between the tread at a point 1/4 of the width of the tread, and the surface of the outer surface of the belt layer of the tire, located in the most remote from the center point in a direction along diameter of the tire.

The length of each branch of the groove from its end edges to the point of connection with the inclined groove is preferably from 50% to 90% of the distance between one edge of the inclined grooves, located on the edge of the tread, and the other edge of this groove. And leaf width of the grooves should preferably be from 0.5% to 4% of the width of the tread. In addition, the depth of branch grooves is preferably 1/3 or more of the depth of the inclined groove. The above makes it possible to achieve a balance between the deformation of the rubber in the direction across the width and around the circumference of the tire, thus achieving an overall reduction of partial wear.

Note that the negative ratio of the area of the contact surface of the tread with the ground, preferably from 15% to 30%, which makes it possible to provide a resisting�there is a heat protector. Negative attitude more than 30% reduces the rigidity of the tread, resulting may deteriorate the wear resistance of the tread. With a negative attitude is less than 15% deteriorates the characteristics of heat dissipation, which becomes the cause of malfunction, such as heat, etc.

The present invention provides a pneumatic tire effectively with high partial resistance to wear without deterioration of heat dissipation of the tread during rotation of the tire under load.

The invention is illustrated by drawings, on which:

Fig.1 is a view in perspective, showing part of the tread of the pneumatic tire as an embodiment of the present invention;

Fig.2(a) and 2(b) shows a perspective image in the disassembled view showing part of the protectors of standard samples 1 and 2 respectively, and Fig.2(C) 2(d) and 2(e) shows part of the protectors of the comparative samples 1, 2 and 3, respectively.

Typically, a pneumatic tyre of this variant has two beads, two sidewalls extending from sides of the outside in the diameter direction of the tire, and the crown is the area between the two sidewalls. In the configuration of the pneumatic tire has a carcass of toroidal passing between each embedded in the bead cent�com and broker composed of multiple belt layers in the crown area of the carcass outward in a radial direction of the tire.

Fig.1 presents a perspective view showing part of the tread of the pneumatic tire according to one possible embodiment of the present invention. A pneumatic tyre 1 according to this embodiment of the has a predetermined direction of rotation R and is equipped with treadmills, parts of which are formed on the crown area 3 by placing there a certain number of inclined grooves 5, which are spaced from each other in the circumferential direction of the tire and extending from both edges 11 of the tread to the Equatorial line e of the tire 1. Each inclined groove 5 includes an elongated portion 5A extending in a direction across the width of the tire, and an inclined portion 5b is inclined at an angle α relative to the direction across the width of the tire. Each branch groove 9 moves away from the inclined groove 5 in the area up to 1/4 of the width of the tread, measured from the edge of the protector 11, passes in the direction to the Equatorial line e in the direction opposite to that in which are inclined grooves 5, at an angle β relative to the line width direction of the tire, and ends respectively in the range of treadmills 6A or 6b of each half the width of the tread divided by the Equatorial line.

The following method of suppressing partial wear through the tread, made in accordance with the present invention. First, provided the oblique grooves 5. In particular, the portion 5b of each of the inclined grooves 5, is inclined toward the rotation direction R, produces the effect of suppressing the deformation of the tread rubber in the width direction of the tire, which occurs with the deformation of the belt. In addition, each inclined groove 5 is provided with a bifurcated groove, which departs from the inclined groove 5 in the area that are up to 1/4 of the width of the tread from the edge 11 of the tread that makes it possible to reduce the elements of the deformation of the rubber in the width direction of the tire in the side areas above. In the case where the branched grooves are held in the circumferential direction of the tire and intersect treadmills tread (see Fig.2(d)), are formed independent treadmills tread. As a result, it can contribute to the deformation of the tread rubber in the circumferential direction of the tire. Therefore, it is important that the branched grooves 9 are inclined to the Equatorial line e of the tire, as shown in Fig.1. In other words, in this configuration, the branched grooves 9 treadmills tread, parts of which are formed between the mutually inclined grooves 5, share bifurcated grooves 9 is angled relative to the direction of the circumference of the tire. At the point contacts�with the ground and tread, as shown by the arrow in Fig.1, the deformation of the tread leads to deformation of M1from the edge of the protector 11 and the deformation of M2from the Equatorial line e, and both of these strains, M1and M2occur in the direction along the branched grooves 9 to the end edge. Deformation of M2from the Equatorial line e inhibits the operation mode of the rubber in the width direction of the tire occurring during the deformation of the belt. On the end edge of the bifurcated grooves 9 both the deformation of M1and M2incorporate so that the elements of the deformation in the width direction of the tire at both sides of the bifurcated grooves 9 cancel each other and disappear. Residual elements of the deformation in the circumferential direction of the tire on the end edge of the bifurcated grooves 9 are connected to form elements of the deformation in the circumferential direction of the tire in the direction opposite to the direction of rotation R.

Fig.2(C) shows a portion of the tire, in which part of the tread is formed with inclined grooves. As shown by the arrow M3the deformation of the tread rubber, occurring when the above-mentioned deformation of the belt extends along the helical grooves 5 toward the rotation direction R; the elements of the deformation in the width direction of the tire meet each other on �equatorially bus lines and compensate each other. As a result there are main elements of the deformation in the circumferential direction of the tire. These elements of the deformation in the circumferential direction of the tire was the main cause partial wear. Now, when using bifurcated grooves 9 are formed of the above-mentioned elements of the deformation of the tire in the direction of its circumference in a direction opposite to the rotation direction R, the data elements of the deformation in the circumferential direction of the tire compensate each other. Thus, the partial suppression of wear in the circumferential direction of the tire.

As shown in Fig.1, the shortest distance d between the branch groove 9 and the adjacent inclined grooves 5 on the other hand relative to the direction of rotation is preferably from 15% to 30% of the width of the tread that makes it possible to more surely prevent the phenomenon of slippage of the tire. If the shortest distance d between the branch groove 9 and the adjacent inclined grooves 5 on the other hand relative to the direction of rotation is less than 15% of the width W of the tread, it becomes impossible to ensure sufficient deformation of the rubber in the circumferential direction of the tire in the bifurcated end of the groove and thus suppressing partial wear of the tire is impossible. In addition, if the crutch�ISEE the distance d between the branch groove 9 and the adjacent inclined grooves 5 on the other hand relative to the direction of rotation is less than 15% of the width W of the tread, deformation of the rubber in the width direction of the tire that occurs on the inner side branch grooves, and thus suppressing partial wear is impossible.

Also preferably, the point at which each branch groove 9 moves away from the inclined groove 5, was located in the area to 1/16 of the width W of the tread from the edge 11 of the tread in the width direction of the tire that makes it possible to more reliably reduce the phenomenon of slippage of the tire.

Also preferably, the angle β bifurcated grooves 9 to the tire width direction ranged from 30° to 60°, which makes it possible to provide the equilibrium deformation of the rubber in the directions of width and around the circumference of the tire, thus providing an overall reduction of partial wear.

In addition, it is preferable that the inclination angle α of the inclined grooves 5 relative to the direction of the width of the tyre is in the range from 5° to 45°.

The oblique grooves 5 preferably extend from the edge 11 of the tread, at least on 3/10 width W of the tread inward in the width direction of the tire, and the average width W1inclined grooves 5 is preferably from 10% to 30% of the width of the tread. In addition, the depth of the inclined grooves 5 is preferably from 60% to 90% of the thickness of the tread rubber.

The length of the I2each bifurcated to�grooves 9 from its end edges to the point of connection with the inclined groove 5 is preferably from 50% to 90% of the distance I 1between one edge of the inclined grooves 5 disposed at the edge of the tread, and the other edge of this groove. And average width w2bifurcated grooves should preferably be from 0.5% to 4% of the width of the tread. Additionally, the amount of the branched grooves is preferably 1/3 or more of the volume of inclined grooves. In addition, the depth of branch grooves is preferably 1/3 or more of the depth of the inclined grooves.

It should be noted that the negative ratio of the area of the contact surface of the tread with the ground, preferably from 15% to 30%, which makes it possible to provide resistance to heat generation of the tread. Negative attitude more than 30% reduces the rigidity of the tread, resulting may deteriorate the wear resistance of the tread. With a negative attitude is less than 15% deteriorates the characteristics of heat dissipation, which becomes the cause of malfunction, such as heat, etc.

In addition, the average value of the width of the branched grooves 9 should preferably be less than the average width of the inclined grooves 5, which gives more reliability to reduce the phenomenon of slippage of the tire.

It should be noted that there is a possibility of placement of a pointer such as an arrow on the visible part of the outer surface of the tire� as a means of indicating the direction of rotation. To this end for indicating the direction of rotation of tyres can be signs of any type; acceptable also signs indicating a position of the tire when installing or showing its internal and external parties.

As mentioned above, the explanation was made for shown in the drawings of samples. However, the present invention is not limited to the above variants of its implementation and can be modified as needed within the scope of the claims. For example, the inclined groove 5 in Fig.1 pass from the edge of the protector 11 with an approximately constant width and end close to the Equatorial line e of the tire. However, the oblique grooves 5 can be formed so that their width is partially expands or contracts to a certain point. In addition, the oblique grooves 5 can cross the Equatorial line e and to pass further. In addition, the oblique grooves 5 runs from the edge of the protector 11 can be both linear and to have a rounded shape. The meaning is that the majority of inclined grooves 5 must have above a sloping configuration. Bifurcated grooves may also deviate zigzag or in the form of a curve.

It was subsequently manufactured a pneumatic tyre according to the present invention, and the following are the results �the TsENKI its characteristics and their explanation. Each of the standard samples 1 and 2 and each of the comparative samples is the size of the tire 46/90R57.

On a standard sample 1 of the pneumatic tire suffered a tread pattern shown in Fig.2(a), in which the inclined grooves mutually connect the edges of the tread. Standard 2 of the pneumatic tire has a tread pattern shown in Fig.2(b), which, in addition to the tread pattern of the standard sample 1, the branched grooves extend in the circumferential direction of the tire and divide treadmills tread.

Comparative sample 1 has a tread pattern shown in Fig.2(C). In the tread pattern of a comparative example 2 shown in Fig.2(d), in comparison with the tread pattern of a comparative option 1 additionally introduced bifurcated grooves in the circumferential direction of the tire. In comparative sample 3, shown in Fig.2(e), branched grooves of the comparative sample 2 is over pushing the sides of blocks of treadmills.

All tread patterns of standard samples 1 and 2 and all the tread patterns are comparative samples 1, 2 and 3 is equipped with the following configurations of the grooves, as indicated in Table 1. Here, the term "depth of the inclined groove" means the depth of the groove at the point, which is an indicator of tread wear; the term "length of the inclined grooves" means the length if�AI, connecting the centers of the width of the groove, and the term "angle of inclination of the inclined grooves" means the angle of inclination of the inclined grooves relative to the direction of the width of the tire. In addition, the term "length of branch grooves" means the length of the line connecting the centers of the width of the groove, and the term "angle of the branched grooves" means the angle of the branched grooves relative to the direction of the width of the tire.

Tests to evaluate performance

Each of the above subjects tire mounted on the rim (29,0×6,0) when the internal pressure of 700 kPa and an applied load of 60,000 lbs. After using these tires as the tires of the front wheels of engineering vehicle for work on site or in the mine for 1,000 hours was conducted the analysis of all obtained results. These results are shown in Table 1.

The results of the evaluation are presented in Table 1 show that the sample of the tire made in accordance with the present invention, has a higher wear resistance. Moreover, it is clear that the location of the inclined grooves with tilt and completion of branch grooves in the blocks of tread also increases the wear resistance of the tire.

By means of the present invention created a pneumatic tyre with a higher resistance�usemost partial wear, by effectively suppressing the slippage of the tire in the direction across the width and along the circumference of the tire, without compromising the heat dissipation characteristics of the tread.

1. A pneumatic tyre with a given direction of rotation, comprising:
treadmills tread portion which is formed with a plurality of inclined grooves extending from both edges of the tread respectively to the Equatorial line of the tire tilted in the direction of rotation relative to the direction of the width of the tire, and
bifurcated grooves, each of which departs from the inclined portion of the groove being in the range of up to 1/4 of the width of the tread from the edge of the tread inward in the width direction of the tire, and directed towards the Equatorial line of the tire in the circumferential direction of the tire opposite to the circumferential direction of the tire, which are inclined grooves relative to the direction of the width of the tire, and ends in a block of the treadmill tread.

2. A pneumatic tyre according to claim 1, in which the shortest distance between the branch groove and the slant groove located near the end opposite the direction of rotation is from 15% to 30% of the width of the tread.

3. A pneumatic tyre according to claim 1 or 2, in which the point at which all branched grooves extend from the inclined grooves located in VNU�Rennie region to 1/16 of the width of the tread from the edge of the tread in the width direction of the tire.

4. A pneumatic tyre according to claim 1, in which the angle of the branched grooves relative to the direction across the width of the tire is from 30° to 60°.



 

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High-capacity tire // 2551699

FIELD: transport.

SUBSTANCE: invention relates to vehicle tire tread design. High-capacity tire includes tread provided with four or five longitudinal grooves so that in axial direction they divide the tread into five or six ribs. Five or six ribs include a pair of ribs of shoulder area each one of which is provided with shoulder lateral groove, and three or four ribs of crown area each one of which is provided with lateral grooves of crown. Lateral grooves of crown pass throughout the crown area rib width. Shoulder lateral grooves pass axially outwards from axially-inner edge of shoulder area rib so that they end at axial distance of 78 to 88% of shoulder area rib axial width from the mentioned axially-inner edge. Depth of longitudinal grooves is 15 to 20 mm. Depth of lateral grooves of crown is 9 to 30% of longitudinal grooves depth. Depth of shoulder lateral grooves is 9 to 25% of longitudinal grooves depth. Tread width TW is 0.78 to 0.87 of tire cross-section width SW.

EFFECT: improved resistance to shoulder tire wear, as well as improved running characteristics of tire on wt road surface.

6 cl, 6 dwg, 1 tbl

Pneumatic tire // 2550237

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. In the tread part, multiple longitudinal and lateral grooves are made. They determine boundaries of multiple rows of blocks. Each of the blocks includes sipes. Length of each of the blocks included into the first row of blocks and the second row of blocks is at least 1.5 times and not more than 2.5 times greater than length of each of the blocks included into the third row of blocks. Width of each of the blocks included into the second row of blocks is greater than width of each of the blocks included into the first row of blocks. Lateral grooves determining boarders of blocks in the first row of blocks and lateral grooves determining boarders of blocks in the second row of blocks are located with shift relative to each other in direction along tire circumference for a distance of at least 0.2 and at most 0.8 of the length of each of the blocks in the first row of blocks. Lateral grooves determining boarders of blocks in the second row of blocks and lateral grooves determining boarders of blocks in the third row of blocks are located so that they communicate with each other being inclined in the same direction relative to tire width direction.

EFFECT: improved operational performance during movement over ice and snow with good balance.

11 cl, 8 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: proposed tire comprises directed patter defining the direction of tire rotation and at least one crosswise groove on tread surface extending from tread edge and inward in direction over tread width beyond central point P of tread width half. Here this tread edge is located whereat groove wall of expulsion side has of at least one crosswise groove has the ledge. The latter extends towards inlet side groove wall relative to point Q. The latter represents the mid distance, over tread width, from tread edge to point P of tread width half. Note here that said ledge extends from position between points P and Q and inward beyond point Q in direction over the tread width.

EFFECT: higher resistance to abrasive wear.

4 cl, 6 dwg, 1 tbl

Pneumatic tire // 2548308

FIELD: transport.

SUBSTANCE: invention relates to tire tread. Pneumatic tire (10) tread (12) comprises two peripheral main grooves (14) made nearby the tire width centre some 1/3 of width W of the surface of contact with soil from edge (7) of said surface and oriented towards tire circumference. Central tread (16) arranged between two peripheral main grooves (14). Side grooves (18) are made on sides over tore width outside both peripheral main grooves (14). Main crosswise grooves (20) are arranged in side treads (18) extending from peripheral main grooves (14) to edges T of the surface of contact with soil. Side treads (18) include no main grooves to connect adjacent main crosswise grooves (20) with each other.

EFFECT: higher adhesion, better stability of control and acceleration characteristics on ice.

3 cl, 2 dwg, 2 tbl

FIELD: transport.

SUBSTANCE: invention relates to the automotive industry. A tyre frame being a tyre base, and a vulcanised tread which is glued to the tyre frame, are formed separately and connected to each other, forming the tyre. The tread, in its cross (axial) direction, has a set of grooves passing in its longitudinal (circumferential) direction. The tread thickness in the cross section gradually decreases from the equator to the edge from the side of the equator of the extreme external groove located in axial and extreme external area and is gradually increased from the external edge of the extreme external groove outside in the axial direction.

EFFECT: possibility of the regulation of uneven wear of the tread.

6 cl, 7 dwg

Pneumatic tire // 2523539

FIELD: transport.

SUBSTANCE: pneumatic tire 1 having excellent snow-running characteristics while keeping control stability and resistance to uneven wear, including tread 2 containing a pair of longitudinal crown grooves running continuously in longitudinal direction of tire at both sides of tire equator C and having edges, where one edge 3m runs in zigzag fashion, so that L-shaped sections 3s of groove edge are continuously interconnected in tire longitudinal direction, and the other edge 3n runs in corrugated manner so that arc-shaped sections of groove edge 3o having arc-shaped convexity towards groove centre are continuously interconnected in tire longitudinal direction where each section 3s of L-shaped groove edge includes long portion 3c inclined at angle of 1 to 20° relative to longitudinal direction, and short portion 3t with longitudinal length less than this value for long portion 3c and inclined in direction opposite to direction of the mentioned long portion 3c relative to longitudinal direction.

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

Automotive tire // 2521033

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tread 2 has rounded shoulders and is divided by the main lengthwise grooves 3 and crosswise grooves 4 in blocks 5 furnished with pockets 6, each having zigzag part 8. Lengthwise grooves 3 include at least two axially outer lengthwise grooves 3o dividing the tread 2 into shoulders Ysh and crowns Ycr wherein zigzag part 8 of pockets 6sh in shoulders Ysh features larger zigzag amplitude Wsh and larger zigzag pitch Psh that zigzag amplitude Wcr and zigzag pitch Wcr of zigzag part 8 of pockets 6cr in crowns Ycr. Inclination angle θsh of pockets 6sh relative to axial direction is smaller than angle θcr.

EFFECT: improved flotation at dry road at minimum deterioration of performances on snow-covered road.

7 cl, 7 dwg, 1 tbl

High-capacity tire // 2551699

FIELD: transport.

SUBSTANCE: invention relates to vehicle tire tread design. High-capacity tire includes tread provided with four or five longitudinal grooves so that in axial direction they divide the tread into five or six ribs. Five or six ribs include a pair of ribs of shoulder area each one of which is provided with shoulder lateral groove, and three or four ribs of crown area each one of which is provided with lateral grooves of crown. Lateral grooves of crown pass throughout the crown area rib width. Shoulder lateral grooves pass axially outwards from axially-inner edge of shoulder area rib so that they end at axial distance of 78 to 88% of shoulder area rib axial width from the mentioned axially-inner edge. Depth of longitudinal grooves is 15 to 20 mm. Depth of lateral grooves of crown is 9 to 30% of longitudinal grooves depth. Depth of shoulder lateral grooves is 9 to 25% of longitudinal grooves depth. Tread width TW is 0.78 to 0.87 of tire cross-section width SW.

EFFECT: improved resistance to shoulder tire wear, as well as improved running characteristics of tire on wt road surface.

6 cl, 6 dwg, 1 tbl

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