Pneumatic tire

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

 

The present invention relates to a pneumatic tire suitable for use in winter, and, more precisely, relates to a pneumatic tire having improved performance characteristics when driving on ice and improved operational characteristics when driving on snow with good balance.

Pneumatic tire for winter use, such as nachipovna bus, usually has the following configuration. A plurality of longitudinal grooves extending in the circumferential direction of the tire, and many lateral grooves extending in the width direction of the tire, made in the tread portion, and these longitudinal and lateral grooves define the boundaries of a plurality of blocks. Numerous slit-like drainage grooves, passing in the width direction of the tire formed in each of the blocks (see, for example, the publication of the patent application of Japan No.. 2009-96220).

Such a pneumatic tire designed for use in the winter, must have operational characteristics for driving on ice and operational characteristics for driving on snow. Typically, when required to improve operational performance for driving on ice, the number of slit-like drainage grooves, which must be performed in each block is increased to enhance the edge effect, provide.�prominent drainage grooves. However, the implementation of numerous slit-like drainage grooves in each block leads to a decrease in block rigidity and, hence, to decrease the stability control of the vehicle when driving on snow. In some cases, even the operational characteristics when driving on ice deteriorate because of the flattening of the blocks. Accordingly, it is difficult to simultaneously improve both the operational characteristics when driving on ice and operational characteristics when driving on snow.

The object of the present invention is to provide a pneumatic tire having improved performance characteristics when driving on ice and improved operational characteristics when driving on snow with good balance.

A pneumatic tyre according to the present invention for solving the above problems is a pneumatic tire, containing: a tread portion extending in the circumferential direction of the tire and forming an annular shape; the two parts constituting the sidewall and respectively located on both sides of the tread portion; and two side parts located respectively with the inner sides of the parts constituting the sidewall in the radial direction of the tire, wherein the tread portion is formed with many of prodelin�x grooves extending in the circumferential direction of the tire, and multiple lateral grooves extending in the width direction of the tire, with longitudinal grooves and lateral grooves define the boundaries of a plurality of rows of blocks, each of which includes a plurality of blocks, each set of blocks in the set of rows of blocks performed with numerous slit-like drainage grooves, passing in the width direction of the tire, and a plurality of longitudinal grooves includes a first longitudinal groove located at the place closest to the Equatorial line of the tire, a second longitudinal groove located closer to one end of the contact zone in the direction of width of the tire, than the first longitudinal groove, and a third longitudinal groove located closer to this one end of the contact zone in the tire width direction than the second longitudinal groove, with many rows of blocks includes a first row of blocks, formed between the first longitudinal groove and the second longitudinal groove, the second row of blocks, formed between the second longitudinal groove and a third longitudinal groove, and the third row of blocks formed in the shoulder area closer to this one end of the contact zone in the tire width direction than the third longitudinal groove, the length of each of the blocks, included in the first row of blocks and the second row unit�in, not less than 1.5 times and not more than 2.5 times the length of each of the blocks included in the third row of blocks, the width of each of the blocks included in the second row of blocks is greater than the width of each of the blocks included in the first row of blocks, while lateral grooves defining the blocks of the first row of blocks, and the lateral grooves defining the blocks of the second row of blocks are offset relative to each other in the circumferential direction of the tire by a distance of not less than 0.2 and more than 0.8 times the length of each of the blocks in the first row of blocks, and the lateral grooves defining the blocks of the second row of blocks, and the lateral grooves defining the blocks of the third row of blocks are arranged so that they communicate with each other, being inclined in the same direction relative to the direction of the width of the tire.

In the present invention, each block included in the first row of blocks and the second row of blocks, made with a length that is greater than the length of each block included in the third row of blocks located in the shoulder area. Thus, each block included in the first row of blocks and the second row of blocks, will have a relatively higher stiffness. In addition, the lateral grooves defining the blocks of the first row of blocks, and the lateral grooves defining g�anity blocks of the second row of blocks, are offset from each other in the circumferential direction of the tire. Thus, the blocks included in the first row of blocks and the second row of blocks will limit the flattening each other. As a result, even if numerous slit-like drainage grooves are formed in each block of the first row of blocks and the second row of blocks, it will be possible to avoid reduction of the rigidity of the blocks of data for a slit-like drainage grooves. Thus, the operational characteristics when driving on ice and operational characteristics when driving on snow can be improved with good balance for pneumatic tires designed for winter use, such as nachipovna bus.

In addition, each unit included in the second row of blocks, made with a greater width compared with the width of each block included in the first row of blocks. Through this configuration, there is great rigidity of each block located on the outer side of the tread portion. Thus, the stability control of the vehicle when driving on snow can be improved. In addition, the lateral grooves defining the blocks of the second row of blocks, and the lateral grooves defining the blocks of the third row of blocks are arranged so that they communicate with others�d, being tilted in the same direction relative to the direction of the width of the tire. This configuration provides improved operational characteristics associated with the displacement of the snow, and, thus, the stability control of the vehicle when driving on snow can be improved.

In the present invention the width of the second longitudinal grooves is preferably less than the width of the third longitudinal grooves. The implementation of the second longitudinal grooves narrower provides amplification of the action of the blocks included in the first row of blocks and the second row of blocks, while ensuring their support for each other, and, thus, the stability control of the vehicle when driving on snow can be improved.

The width of each of the blocks included in the second row of blocks, preferably not less than 1.2 times and not more than 1.5 times the width of each of the blocks included in the first row of blocks. Thus, the stability control of the vehicle when driving on snow can be improved.

The first longitudinal groove preferably has a maximum width of the grooves of the plurality of longitudinal grooves. The placement of the first longitudinal grooves having a maximum width of the grooves in the Central zone of the tread portion provides improved initial response when steering �the Board by way of the steering wheel when driving when driving on snow, and, thus, the stability control of the vehicle when driving on snow can be improved.

Each of the blocks included in the first row of blocks and the second row of blocks, preferably made with one closed groove having one end closed in the block. Such closed grooves provide improved braking performance when driving on snow and almost do not cause reduction of rigidity of each block. In particular, preferably, the lateral grooves and the closed grooves in the first row of blocks were tilted in the same direction relative to the direction of the width of the tire, and lateral grooves and the closed grooves in the second row of blocks were tilted in the same direction relative to the direction of the width of the tire. This configuration provides improved characteristics associated with the displacement of the snow, and, thus, the stability control of the vehicle when driving on snow can be improved.

The angle of inclination of the lateral grooves and the closed grooves relative to the direction of the width of the tire in the first row of blocks is preferably from 15° to 40°, and the angle of inclination of the lateral grooves and the closed grooves relative to the direction of the width of the second row of blocks is preferably from 15° to 40°. This configuration allows to provide pain�nd the shear force of columns of snow when driving when driving on snow, while ensuring sufficient rigidity of the blocks. Thus, can be enhanced braking characteristics when driving on snow.

The present invention is applicable to a pneumatic tire designed to be mounted on the vehicle so that any of the two lateral sides of the tire may be drawn to an outer side of the vehicle. However, the present invention is also applicable to pneumatic tires having such an asymmetric tread pattern, the tire will be mounted on the vehicle with a certain side of the tire facing the outer side of the vehicle. In that case, when the pneumatic tire has an asymmetric tread pattern, the tire will be mounted on the vehicle with a certain/specified side of the tire facing the outer side of the vehicle, the first-third rows of blocks preferably are located in the area closer to the outer side of the vehicle than the Equatorial line of the tire in the tread portion. This configuration effectively provides increased stability when operating the vehicle when driving on snow.

In addition, in the pneumatic tire has an asymmetric tread pattern, the tire will be mounted on the vehicle with a certain/specified side �ins, drawn to an outer side of the vehicle, a plurality of longitudinal grooves preferably includes a fourth longitudinal groove located closer to the other end of the contact zone in the tire width direction than the first longitudinal groove, and a fifth longitudinal groove located closer to this other end of the contact zone in the tire width direction than the fourth longitudinal groove, with many rows of blocks preferably includes a fourth row of blocks, formed between the first longitudinal groove and the fourth longitudinal groove, the fifth row of blocks formed between the fourth longitudinal groove and the fifth longitudinal groove, and the sixth row of blocks, educated in the shoulder area closer to this other end of the contact zone in the tire width direction than the fifth longitudinal groove, and the fifth row of blocks adjacent to the sixth row of blocks, preferably has a maximum width of the blocks among the rows of blocks located between the first longitudinal groove and the fifth longitudinal groove. In other words, it is preferable that in the area closer to the inner side of the vehicle than the Equatorial line of the tire in the tread portion, the fifth row of blocks had a maximum width of the blocks among the rows of blocks located between the first longitudinal groove and fifth longitudinally� groove. This configuration provides increased stiffness units located on the outer side of the tread portion, also in the area closer to the inner side of the vehicle. Thus, can improve the stability of the vehicle when driving on snow.

The length of each of the blocks included in the fourth row of blocks, is preferably not less than 0.7 of the length of each of the blocks included in the first row of blocks, and not more than 1.3 times the length of each of the blocks included in the first row of blocks, and the lateral grooves defining the blocks of the first row of blocks, and the lateral grooves defining the blocks of the fourth row of blocks preferably are offset relative to each other in the circumferential direction of the tire by a distance of not less than 0.2 and not more than 0.8 of the length of each of the blocks in the first row of blocks. The placement of the blocks with greater length in the Central zone of the tread portion, as described above, provides improved stability when operating the vehicle when driving on snow. In addition, by locating the lateral grooves defining the blocks in the first row and the lateral grooves defining the blocks in the fourth row, with offset relative to each other in the direction along the okra�surface of the tire, the blocks included in the first row of blocks and the fourth row of blocks may limit the flattening each other.

Lateral grooves defining the blocks of the fifth row of blocks, and the lateral grooves defining the blocks of the sixth row of blocks, preferably are arranged so that they communicate with each other, being inclined in the same direction relative to the direction of the width of the tire. This configuration provides improved characteristics associated with the displacement of the snow, and what could be improved stability when operating the vehicle when driving on snow.

In the present invention the width of the grooves and the depth of the grooves, the longitudinal grooves is not limited in a particular way. For example, the width of each of the grooves is 2 mm or more and 15 mm or less, and the depth of each groove is 6 mm or more and 10 mm or less. Closed groove is defined as a groove, which has a maximum width of the groove equal to 2 mm or more and 10 mm or less (preferably 3 mm or more and 7 mm or less), and the maximum depth of the grooves is 5 mm or more and 10 mm or less. Meanwhile, slit drainage groove is defined as a groove, grooves having a width equal to 1 mm or less. In addition, the closed groove is a groove having end �part b, hole in the block. Nevertheless, it is possible that slit drainage groove with a width of 1 mm or less was reported with a closed end portion. Such slit drainage groove with small width does not cause significant attenuation of the effects provided by the "closure" of the grooves.

Hereinafter the present invention will be described in more detail with reference to the accompanying drawings, in which:

Fig. 1 is a perspective view showing a pneumatic tire according to one embodiment of the present invention;

Fig.2 is a meridional cross-section showing a pneumatic tire according to this embodiment of the present invention;

Fig.3 is a detailed view showing the tread pattern of the pneumatic tire according to this embodiment of the present invention;

Fig.4 is a plan view showing the main part of the tread pattern of the pneumatic tire of Fig.3 on an enlarged scale;

Fig.5 is a plan view showing the main part of the tread pattern of the pneumatic tire of Fig.3 in a larger view.

Fig.6 is a plan view showing the main part of the tread pattern of the pneumatic tire of Fig.3 on an enlarged scale;

Fig.7 is a detailed view showing the tread pattern of the pneumatic tire according to another embodiment of the present invention; and

Fig.8 - deployed�the second kind, showing the tread pattern of the tyre test (Comparative example 1).

The configuration according to the present invention will be described below in detail with reference to the accompanying drawings. Fig.1 and 2 show a pneumatic tire according to one embodiment of the present invention. As shown in Fig.1 and 2, a pneumatic tire according to this embodiment of the includes a tread portion 101 extending in the circumferential direction of the tire and having an annular shape, the two parts 102, constituting the sidewall and respectively located on both sides of the tread portion 101, and two side pieces 103, respectively located on the inner sides of the parts 102, constituting the sidewall in the radial direction of the tire.

Two layer 104 of the frame are positioned so that they extend from one side portion 103 to the other side portion 103. Each of the layers data frame 104 includes many reinforcing cords extending in the radial direction of the tire, and bent around the core 105 of the bead from the inside to the outside of the tire, wherein the core 105 side is provided in each of the side parts 103. The filler material 106 of a Board having a triangular cross section and formed from a rubber compound, is located on the outer circumferential periphery of each of the cores 105 b�mouths.

Multiple layers 107 of the belt embedded in the tread portion 101 in the portion located from the outer circumferential periphery of the layers 104 of the frame. Data layers 107 of the belt include many reinforcing cords inclined at angle relative to the direction along the tire circumference. Reinforcing cords in one layer are arranged so that they intersect with a reinforcing cords in the other layer. In the layers 107 of the belt angles that reinforcing cords inclined relative to the direction along the tire circumference, set within the range of, for example, from 10° to 40°. At least one coating layer 108 of the belt is located from the outer circumferential periphery of the layer 107 of the frame. The covering layer of the breaker 108 is provided to improve durability when driving at high speeds and includes reinforcing cords arranged at an angle, constituting, for example, 5° or less, relative to the direction along the tire circumference.

It should be noted that the internal configuration of the tyre for bus, described above, is a typical example of the pneumatic tire, and the invention is not limited to this configuration.

Fig.3 shows the tread pattern of the pneumatic tire according to this embodiment of the present invention. Each of Fig.4-6 shows the main part of the tread. The pneumatic�Skye tire according to this variant implementation has an asymmetric tread pattern, the tyre must be mounted on the vehicle with its defined/specified side facing the outer side of the vehicle. IN denotes the inner side of the vehicle, and OUT indicates an outer side of the vehicle.

As shown in Fig.3, a plurality of longitudinal grooves 1, 2, 3, 4 and 5 extending in the circumferential direction of the tire, and many lateral grooves 11, 21, 31, 41, 51 and 61 extending in the width direction of the tire, is formed in the tread portion 101. A lot of ranks 10, 20, 30, 40, 50 and 60 units, including a plurality of blocks 15, 22, 32, 42, 52 and 62, are limited longitudinal grooves 1-5 and lateral grooves 11-61.

In particular, the longitudinal groove 1 (the first longitudinal groove is located at the place closest to the Equatorial line CL of the tire, the longitudinal groove 2 (the second longitudinal groove is located closer to one end of the contact zone in the tire width direction (to the outer side of the vehicle) than the longitudinal groove 1, the longitudinal groove 3 (the third longitudinal groove is located closer to this one end of the contact zone in the tire width direction (to the outer side of the vehicle) than the longitudinal groove 2, the longitudinal groove 4 (the fourth longitudinal groove) is located closer to the other end of the contact zone in the direction of the tire width (in�morning side of the vehicle), than the longitudinal groove 1, and the longitudinal groove 5 (the fifth longitudinal groove is located closer to the other end of the contact zone in the tire width direction (to the inner side of the vehicle) than the longitudinal groove 4.

A number of 10 units (the first row of blocks) is formed between the longitudinal groove 1 and the longitudinal groove 2, the number of 20 blocks (the second row of blocks) is formed between the longitudinal groove 2 and the longitudinal groove 3, the range of 30 blocks (third row of blocks) formed in the shoulder area closer to this one end of the contact zone in the tire width direction (to the outer side of the vehicle) than the longitudinal groove 3, the range of 40 blocks (fourth row of blocks) is formed between the longitudinal groove 1 and the longitudinal groove 4, a number of 50 units (the fifth row of blocks) formed between the longitudinal groove 4 and the longitudinal groove 5, and a number of 60 blocks (sixth row of blocks) formed in the shoulder area closer to the other end of the contact zone of the tire in the tire width direction (to the inner side of the vehicle) than the longitudinal groove 5.

A series of 10 blocks includes a plurality of blocks 12, the boundaries of which are defined by longitudinal grooves 1, 2 and lateral grooves 11. Numerous slit-like drainage grooves 13 in the width direction of the tire and each having a zigzag shape on the surface of the tread, images�cies in each block 12. In addition, each block 12 is formed with one closed groove 14, one end of which is closed in the block 12 and the other end is open in the longitudinal groove 1 next to the block 12.

Some 20 blocks includes a plurality of blocks 22, the boundaries of which are defined by longitudinal grooves 2, 3 and lateral grooves 21. Numerous slit-like drainage grooves 23 in the width direction of the tire and each having a zigzag shape on the surface of the protector is formed in each block 22. In addition, each block 22 is closed one groove 24, one end of which is closed in the block 22 and the other end is open in the longitudinal groove 3 near the block 22.

Some 30 blocks includes a plurality of blocks 32, the boundaries of which are defined by longitudinal grooves 3 and lateral grooves 31. Numerous slit-like drainage grooves 33 in the width direction of the tire and each having a zigzag shape on the surface of the protector is formed in each block 32.

Some 40 blocks includes a plurality of blocks 42, the boundaries of which are defined by longitudinal grooves 1, 4 and lateral grooves 41. Numerous slit-like drainage grooves 43 in the width direction of the tire and each having a zigzag shape on the surface of the protector is formed in each block 42.

The number includes 50 units in �you lots of blocks 52, the boundaries of which are defined by longitudinal grooves 4, 5 and lateral grooves 51. Numerous slit-like drainage grooves 53 in the width direction of the tire and each having a zigzag shape on the surface of the protector is formed in each block 52. In addition, each block 52 is provided with two closed grooves 54, one end of which is closed in the block 52 and the other end is open in the longitudinal groove 4 near the block 52, and a closed groove 55, one end of which is closed in the block 52 and the other end is open in the longitudinal groove 5 near the block 52.

Some 60 blocks includes a plurality of blocks 62, the boundaries of which are determined by the longitudinal groove 5 and the side grooves 61. Numerous slit-like drainage grooves 63 in the width direction of the tire and each having a zigzag shape on the surface of the protector is formed in each block 62.

In the pneumatic tire described above, the length L12 of each block 12 included in the range of 10 blocks in the direction along the tire circumference and the length L22 of each unit 22 included in the range of 20 blocks in the circumferential direction of the tire is not less than 1.5 times and not more than 2.5 times higher than each of the length L32 of each unit 32 included in the range of 30 blocks in the circumferential direction of the tyre (see Fig.4). The implementation of the lengths L12, L22 blocks 12, 22 larger than DL�on L32 block 32 in the shoulder area, provides relative increase in the stiffness of each of the blocks 12, 22, included in the ranks 10, 20 blocks. If each of the lengths L12, L22 blocks 12, 22 will be less than the value of 1.5 times the length L32 of the block 32, the rigidity of the blocks 12, 22 is not provided sufficiently. On the other hand, if each of the lengths L12, L22 blocks 12, 22 is more than 2.5 times greater than the length L32 of the block 32, deteriorating the operational characteristics when driving on snow.

In addition, the lateral grooves 11, which determine the boundaries of the blocks 12 of a series of 10 units, and lateral grooves 21 defining the boundaries of the blocks 22 of row 20 blocks are offset relative to each other in the circumferential direction of the tire by a distance of not less than 0.2 and not more than 0.8 of the length L12 of the block 12 of a series of 10 units, more preferably not less than 0.4 and not more than 0.6 of the length L12. By locating the lateral grooves 11 row 10 of blocks and the lateral grooves 21 row 20 blocks offset from each other in the circumferential direction of the tire, as described above, the blocks 12, 22, included in the ranks 10, 20 blocks, limit the flattening each other. If the amount of displacement between the side grooves 11 row 10 of blocks and lateral grooves 21 row 20 blocks is not in the above range, the effect of limiting the flattening of the blocks 12, 22 will be insufficient. It should be noted that the offset value, description�nye here represents the distance in the circumferential direction of the tire from a portion of one of the side grooves 11 that is open in the longitudinal groove 2, to that portion of the respective one of the lateral grooves 21, open in the longitudinal groove 2.

As described above, each of the lengths L12, L22 blocks 12, 22 is made greater than the length L32 of the block 32 in the shoulder area, and lateral grooves 11 row 10 of blocks and lateral grooves 21 row 20 blocks are offset from each other in the circumferential direction of the tire. Thus, even if the numerous slit-like drainage grooves 13, 23 are formed in each of the blocks 12, 22 from the ranks 10, 20 blocks, it is possible to avoid reduction of the rigidity of the blocks 12, 22, caused by the data of the slit-like drainage grooves 13, 23. Therefore, the operational characteristics when driving on ice and operational characteristics when driving on snow can be improved with good balance in the pneumatic tire intended for winter use, such as nachipovna bus.

In addition, the width W22 of each unit 22 included in the range of 20 blocks, is greater than the width W12 of each block 12 included in the range of 10 blocks (see Fig.5). The width W22 of block 22, contained in a number of 20 units, preferably not less than 1.2 times and not more than 1.5 times greater than the width W12 unit 12 included in the range of 10 blocks. Thus, the stiffness increased�recover it in the direction the corresponding order of location blocks blocks 12 and 22, i.e. becomes larger toward the outer side in the width direction of the tread portion 101. Thus, the stability control of the vehicle when driving on snow can be improved. If the width W22 of the block 22 will be less than the value of 1.2 times longer than the width W12 of the block 12, the effect of increasing the rigidity of the block 22 will be insufficient. On the other hand, if the width W22 of the block 22 will be more than the value of 1.5 times the width W12 of the block 12, the effect of increasing sustainability in the management of the vehicle when driving on snow decreases due to a decrease of the area of the grooves.

Each of the lateral grooves 21, which define the boundaries of the blocks 22 of row 20 blocks and a corresponding one of the lateral grooves 31 defining the boundaries of the blocks 32 of a series of 30 blocks, are arranged so that they communicate with each other, being inclined in the same direction relative to the direction of the width of the tire. The placement of the lateral grooves 21 row 20 blocks and lateral grooves 31 series 30 blocks so that they reported to each other, provides an improvement of the characteristics associated with the displacement of the snow, and, thus, the stability control of the vehicle when driving on snow can be improved.

In the pneumatic tire described you�e, the width W2 of the groove in the longitudinal groove 2 is smaller than the width W3 of the groove in the longitudinal grooves 3. The implementation of longitudinal grooves 2 narrower provides amplification of the action of the blocks 12, 22, included in the ranks 10, 20 blocks, while ensuring their support for each other, and, thus, the stability control of the vehicle when driving on snow can be improved. In particular, it is preferable that the width W2 of the groove defined for the longitudinal grooves 2 is set in the range from 2 mm to 6 mm and the width W3 of the groove defined for the longitudinal groove 3 was set in the range from 4 mm to 10 mm.

Among the many longitudinal grooves 1-5 longitudinal groove 1 has a width W1 of the groove, which is the highest. In other words, the width W1 of the groove defined for the longitudinal groove 1 is set larger than the width W2 of the groove defined for the longitudinal grooves 2 than the width W3 of the groove defined for the longitudinal grooves 3 than the width W4 of the groove defined for the longitudinal grooves 4, and the width W5 of the groove defined for the longitudinal groove 5. The placement of longitudinal grooves 1, having a width W1 of the groove, which is greatest in the Central zone of the tread portion 101 provides improved initial response when steering through the steering wheel when driving when driving on SN�GU, and, thus, the stability control of the vehicle when driving on snow can be improved. In other words, a broad longitudinal groove 1 provides reliable traction in the snow. In particular, it is preferable that the width W1 of the groove defined for the longitudinal grooves 1, was specified in the range from 5 mm to 15 mm.

One closed groove 14 is located in each block 12 included in the range of 10 blocks, and one closed groove 24 is located in each unit 22 included in the range of 20 blocks, with one end closed grooves 14, 23 is closed. Such closed grooves 14, 24 provide improved braking performance when driving on snow, and the stiffness of the blocks 12, 22 is almost not reduced. In that case, when added closed grooves 14, 24, preferably, the lateral grooves 11 and closed grooves 14 in a row of 10 blocks were tilted in the same direction relative to the direction of the width of the tire, and lateral grooves 21 and closed grooves 24 in the range of 20 blocks were tilted in the same direction relative to the direction of the width of the tire. This configuration provides improved characteristics associated with the displacement of the snow, and, thus, the stability control of the vehicle when driving on snow can be improved.

The angles θ11, θ14 tilt Bo�lateral grooves 11 and the closed grooves 14 in a row of 10 blocks relative to the direction of the width of the tire is set in the range of 15° to 40°, and the angles θ21, θ24 of inclination of the lateral grooves 21 and the closed grooves 24 in a series of 20 units relative to the direction of the width of the tire is set in the range of 15° to 40° (see Fig.6). This configuration allows providing a large shear force of columns of snow when driving when driving on snow, while ensuring sufficient rigidity of the blocks 12, 22. Thus, the braking characteristics when driving on snow can be improved. If the angles θ11, θ14, θ21 and θ24 slope is less than 15°, the stability control of the vehicle when driving on snow decreases. On the other hand, if the angles θ11, θ14, θ21 and θ24 tilt amount to more than 40°, the rigidity of the blocks 12, 22 is reduced and braking characteristics when driving on snow-dependent shear forces of columns of snow, is also deteriorating. It should be noted that each of the angles θ11, θ14, θ21 and θ24 slope determined on the basis of a straight line passing through both ends having a greater length of one of the surfaces of the walls of the respective grooves.

Pneumatic tire described above, has such an asymmetric tread pattern, the tyre must be mounted on the vehicle with a certain/specified side of the tire facing the outer side of the vehicle, and ranks 10, 20, 30 blocks, with the characteristics described above, charac�hree in the area closer to the outer side of the vehicle than the Equatorial line CL of the tire in the tread portion 101. Thus, the stability control of the vehicle when driving on snow can be effectively increased.

Meanwhile, in the zone located closer to the inner side of the vehicle than the Equatorial line CL of the tire, in the tread portion 101, a series of 50 units, with a number of neighbouring 60 blocks located in the shoulder area, has the greatest width among the rows of blocks 40, 50 blocks located between the longitudinal groove 1 and the longitudinal groove 5. In other words, regarding the values of the width W42, W52 blocks 42, 52, included in the series 40, 50 blocks, the width greater than the width W52 W42. Thus, also in the zone located closer to the inner side of the vehicle, the rigidity of the blocks 42, 52 becomes larger toward the outer side in the width direction of the tread portion 101. Thus, the stability control of the vehicle when driving on snow can be improved.

The length L42 of each unit 42 included in the range of 40 blocks, in the direction along the tire circumference is set such that it amounted to not less than 0.7 of the length L12 of each block 12 included in the range of 10 blocks in the circumferential direction of the tire and not more than 1.3 times the length L12 of each block, vklyucheno� in the range of 10 blocks, in the circumferential direction of the tire. In other words, the length L42 of the block 42 is similar to the length L12 of the block 12. By placing thus a relatively long blocks 42 in the Central zone of the tread portion 101, the stability control of the vehicle when driving on snow can be improved.

In addition, the lateral grooves 11, which determine the boundaries of the blocks 12 of a series of 10 units, and lateral grooves 41 defining the boundaries of the blocks 42 from number 40 blocks are offset relative to each other in the circumferential direction of the tire by a distance of not less than 0.2 and not more than 0.8 of the length L12 of the block 12 of a series of 10 units, more preferably not less than 0.4 and not more than 0.6 of the length L12. By locating the lateral grooves 11 row 10 of blocks and side grooves 41 series 40 blocks offset from each other in the circumferential direction of the tire, the blocks 12, 42, included in the ranks of 10, 40 blocks, limit the flattening each other. If the amount of displacement between the side grooves 11 row 10 of blocks and side grooves 41 series 40 blocks is not in the above range, the effect of limiting the flattening of the blocks 12, 42 will be insufficient. It should be noted that the offset value described here represents a distance in the circumferential direction of the tire from a portion of one of the side grooves 11 that is open in the longitudinal groove 1, up to an hour�and a corresponding one of the side grooves 41, open in a longitudinal groove 1.

Each of the lateral grooves 51, which define the boundaries of the blocks 52 of a series of 50 units and a corresponding one of the lateral grooves 61 that define the boundaries of blocks 62 from some 60 blocks are arranged so that they communicate with each other, being inclined in the same direction relative to the direction of the width of the tire. The placement of the lateral grooves 51 number of 50 units and lateral grooves 61 series 60 blocks so that they reported to each other, provides an improvement of the characteristics associated with the displacement of the snow, and, thus, the stability control of the vehicle when driving on snow can be improved.

Fig.7 is a plan view showing the tread pattern of the pneumatic tire according to another embodiment of the present invention. A pneumatic tyre according to this variant implementation has a more longitudinal grooves than a pneumatic tyre according to the variant of implementation described above. Components same as the components in Fig.3, are denoted by the same reference positions, and their detailed descriptions are omitted.

As shown in Fig.7, a longitudinal groove 6 (sixth longitudinal groove) extending in the circumferential direction of the tire, added between the longitudinal groove 4 and the longitudinal groove 5 in the tread portion 101. Thus, a number of 70 blocks (with�dimou row of blocks) will be formed between the longitudinal groove 4 and the longitudinal groove 6.

Some 70 blocks includes a plurality of 72 units, the boundaries of which are defined by longitudinal grooves 4, 6 and lateral grooves 71. Numerous slit-like drainage grooves 73 in the width direction of the tire and each having a zigzag shape on the surface of the protector is formed in each block 72. In addition, each block 72 is executed one closed groove 74, one end of which is closed in the block 72 and the other end is open in the longitudinal groove 6, the neighboring block 72. The number of longitudinal grooves may be increased in accordance with the width of the tread portion 101 as described above.

Above were described in detail preferred embodiments of the present invention. It should be understood that various modifications, substitutions and replacements can be made for the embodiments, provided that such modifications, substitutions and replacements made within the essence and scope of the present invention defined in the attached claims.

Were prepared pneumatic tires according to Examples 1-6 with the following configuration. Each of the pneumatic tires had a tire size of 215/60R16 and the asymmetric tread pattern, the tyre must be mounted on the vehicle with its specified/to a specific side facing the outer side transport�th funds. In each of the pneumatic tires, similar to that shown in Fig.1, a plurality of longitudinal grooves extending in the circumferential direction of the tire, and many lateral grooves extending in the width direction of the tire were made in the tread, and a plurality of rows of blocks each of which includes a plurality of blocks, were formed by data of the longitudinal grooves and lateral grooves. In each of the multiple blocks included in the rows of blocks were made of numerous slit-like drainage grooves, passing in the width direction of the tire. Widths W1, W2, W3, W4 and W5 grooves, longitudinal grooves, the width W12, W22, W42 and W52 blocks for the blocks included in the first to fourth rows of blocks, the presence or absence of closed grooves in the blocks included in the first and second rows of blocks were set as shown in table 1 for each of Examples 1-6.

In each of Examples 1-6, the ratio of the lengths of the blocks for the first to fourth rows of blocks was as follows L12:L22:L32:L42=2:2:1:2. Lateral grooves of the first row of blocks and lateral grooves of the second row of blocks have been located with an offset from each other in the circumferential direction of the tire by a distance equal to 0.5 times the length L12 of the block. Lateral grooves of the first row of blocks and lateral grooves of the fourth row of blocks have been located with an offset from each other�and in the circumferential direction of the tire by a distance equal to 0.5 of the length L12 of the block. The angles θ11, θ21 of inclination of the lateral grooves of the first row of blocks and the second row of blocks was 25°. In the case where the blocks included in the first row of blocks and the second row of blocks were performed in closed grooves, angles θ14, θ24 tilt closed grooves was 25°. In addition, all values of the depth of the grooves, the longitudinal grooves was 9.1 mm.

For comparison was prepared by the tire in Comparative example 1 having the tread pattern shown in Fig.8. In particular, in the tire according to Comparative example 1 in tread parts were made four longitudinal grooves extending in the circumferential direction of the tire, and many lateral grooves extending in the width direction of the tire, and five rows of blocks, each of which is formed of multiple blocks that were formed by the longitudinal grooves and lateral grooves. In addition, numerous slit-like drainage grooves, passing in the width direction of the tire were made in each of the multiple blocks included in the rows of blocks. In the comparative example, the width of the grooves, two longitudinal grooves located in the center, was 8 mm, and the width of the grooves, two longitudinal grooves located on the side of the shoulder, was 6 mm. All the values of the depth of the grooves, the longitudinal grooves was 9.1 mm.

�La the tires, intended for testing, was performed evaluating the braking performance when driving on ice and stability control of the vehicle when driving on snow using the evaluation method described below. The evaluation results are shown in table 1.

Braking characteristics when driving on ice

Each of the tire test was mounted on a wheel having a rim size of 16×7J, inflated to an air pressure gap of 230 kPa, and mounted on the vehicle, intended for testing. Braking is performed to stop the vehicle moving at a speed of 40 km/h on ice, and measured the braking distance up to the full stop of the vehicle. The evaluation results are shown by using indicators representing the inverse of the measured values, while the result for Comparative example 1 is 100. Higher rate means better braking performance when driving on ice.

The stability control of the vehicle when driving on snow

Each of the tire test was mounted on a wheel having a rim size of 16×7J, inflated to an air pressure gap of 230 kPa, and mounted on the vehicle, intended for testing. After that was done ozenc�first test when driving on snow, performed by the test driver. The evaluation results are shown by indices, wherein the result for Comparative example 1 is 100. Higher rate means better stability when operating the vehicle when driving on snow.

Table 1
Comparative
example 1
Example 1Example 2Example 3Example 4Example 5Example 6
The width of the grooves,
defined for
longitudinal grooves (mm)
W1-6,06,07,06,06,07,0
W2-4,53,53,54,53,53,5
W3- 6,06,06,06,06,06,0
W4-3,53,53,53,53,53,5
W5-6,06,06,06,06,06,0
Width of block (mm)W11-11,0Of 13.012,011,0Of 13.012,0
W2115,015,015,015,015,015,0
W41-17,017,017,0 17,017,017,0
W51-23,023,023,023,023,023,0
The availability or
no
closed grooves
NoNoNoNoAvailableAvailableAvailable
Brake feature
when driving
on ice
100105105105105105105
Stability at
traffic control
means
when driving
on snow
100103107110108112115

�AK obvious from table 1, the tires according to Examples 1-6 had the best braking performance when driving on ice and stability when operating the vehicle when driving on snow compared with the tire in Comparative example 1.

1. A pneumatic tyre, comprising:
the tread portion extending in the circumferential direction of the tire and forming an annular shape;
the two parts constituting the sidewall and respectively located on both sides of the tread portion; and
two side pieces located respectively with the inner sides of the parts constituting the sidewall in the radial direction of the tire,
when the tread portion is formed with a plurality of longitudinal grooves extending in the circumferential direction of the tire, and multiple lateral grooves extending in the width direction of the tire, with longitudinal grooves and lateral grooves define the boundaries of a plurality of rows of blocks, each of which includes a plurality of blocks, each set of blocks in the set of rows of blocks performed with numerous slit-like drainage grooves, passing in the width direction of the tire,
moreover, a plurality of longitudinal grooves includes a first longitudinal groove located at the place closest to the Equatorial line of the tire, a second longitudinal groove located closer to one to�ntsu of the contact zone in the direction of width of the tire, than the first longitudinal groove, and a third longitudinal groove located closer to the specified one end of the contact zone in the tire width direction than the second longitudinal groove,
with many rows of blocks includes a first row of blocks, formed between the first longitudinal groove and the second longitudinal groove, the second row of blocks, formed between the second longitudinal groove and a third longitudinal groove, and the third row of blocks formed in the shoulder area closer to the specified one end of the contact zone in the tire width direction than the third longitudinal groove
the length of each of the blocks included in the first row of blocks and the second row of blocks, not less than 1.5 times and not more than 2.5 times the length of each of the blocks included in the third row of blocks,
the width of each of the blocks included in the second row of blocks is greater than the width of each of the blocks included in the first row of blocks,
and the lateral grooves defining the blocks of the first row of blocks, and the lateral grooves defining the blocks of the second row of blocks are offset relative to each other in the circumferential direction of the tire at a distance of not less than 0.2 and more than 0.8 times the length of each of the blocks in the first row of blocks,
while lateral grooves defining the blocks of �which row of blocks, and lateral grooves defining the blocks of the third row of blocks are arranged so that they communicate with each other, being inclined in the same direction relative to the direction of the width of the tire.

2. A pneumatic tyre according to claim 1, in which the width of the second longitudinal grooves is less than the width of the third longitudinal grooves.

3. A pneumatic tyre according to claim 1 or 2, in which the width of each of the blocks included in the second row of blocks, not less than 1.2 times and not more than 1.5 times the width of each of the blocks included in the first row of blocks.

4. A pneumatic tyre according to claim 1 or 2, in which the first longitudinal groove has a maximum width of the grooves of the plurality of longitudinal grooves.

5. A pneumatic tyre according to claim 1 or 2, in which each of the blocks included in the first row of blocks and the second row of blocks, made with one closed groove having one end closed in the block.

6. A pneumatic tyre according to claim 5, in which
lateral grooves and the closed grooves in the first row of blocks is tilted in the same direction relative to the direction of the width of the tire, and
lateral grooves and the closed grooves in the second row of blocks is tilted in the same direction relative to the direction of the width of the tire.

7. A pneumatic tyre according to claim 6, in which
the angle of inclination of the lateral grooves and the closed grooves relative to dir�of the tire width in the first row of blocks is from 15° to 40°, and
the angle of inclination of the lateral grooves and the closed grooves relative to the direction of the width of the second row of blocks is from 15° to 40°.

8. A pneumatic tyre according to claim 1 or 2, with the asymmetric tread pattern that she will be mounted on the vehicle with a certain/specified side of the tire facing the outer side of the vehicle, and
first - third rows of blocks are located in the area closer to the outer side of the vehicle than the Equatorial line of the tire in the tread portion.

9. A pneumatic tyre according to claim 8, in which
a plurality of longitudinal grooves includes a fourth longitudinal groove located closer to the other end of the contact zone in the tire width direction than the first longitudinal groove, and a fifth longitudinal groove located closer to this other end of the contact zone in the tire width direction than the fourth longitudinal groove
with many rows of blocks includes a fourth row of blocks, formed between the first longitudinal groove and the fourth longitudinal groove, the fifth row of blocks formed between the fourth longitudinal groove and the fifth longitudinal groove, and the sixth row of blocks formed in the shoulder area closer to this other end of the contact zone in the tire width direction than the fifth longitudinal groove
p�eacham fifth row of blocks, adjacent to the sixth row of blocks, has the greatest width among the rows of blocks blocks located between the first longitudinal groove and the fifth longitudinal groove.

10. A pneumatic tyre according to claim 9, in which
the length of each of the blocks included in the fourth row of blocks is not less than 0.7 of the length of each of the blocks included in the first row of blocks, and not more than 1.3 times the length of each of the blocks included in the first row of blocks, and
lateral grooves defining the blocks of the first row of blocks, and the lateral grooves defining the blocks of the fourth row of blocks are offset relative to each other in the circumferential direction of the tire by a distance of not less than 0.2 and not more than 0.8 of the length of each of the blocks in the first row of blocks.

11. A pneumatic tyre according to claim 9, in which the lateral grooves defining the blocks of the fifth row of blocks, and the lateral grooves defining the blocks of the sixth row of blocks, arranged so that they communicate with each other, being inclined in the same direction relative to the direction of the width of the tire.



 

Same patents:

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

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 // 2537987

FIELD: transport.

SUBSTANCE: invention relates to motor tire tread pattern. Tire tread is provided with blocks each one of which has surface of block wall facing transversal groove tilted at an angle (Θ) of 5 to 40 degrees relative to axial tire direction and thus forming acute-angled edge and obtuse-angled edge of block. Block wall surface between acute-angled edge and obtuse-angled edge is provided with at least two slots of 0.3 to 2.0 mm in width. Distance P2 measured from acute-angled edge to one of at least two mentioned slots the nearest to acute-angled edge is greater than distance P1 measured from mentioned obtuse-angled edge to one of at least two mentioned slots the nearest to obtuse-angled edge. Each distance is measured along radially outer edge of block wall surface to slot centre across width.

EFFECT: tire noise reduction.

10 cl, 5 dwg, 1 tbl

Auto tire // 2531534

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire 1 comprises: circular groove 12 made in crown zone, tread runner 22 divided by said groove 12 and crosswise grooves made at tread runner. Crosswise grooves comprises first crosswise groove 32 dividing the tread runner into several blocks and second crosswise groove 51 dividing the block 42 separated by first crosswise groove into block first and second parts 61, 62. Circular groove part depth in contact with second block is smaller than that of circular groove in contact with first block.

EFFECT: higher stiffness, better tread drainage.

5 cl, 5 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter. Winter tire (1) has tread (2) with relied patter composed of multiple lengthwise grooves (4) and crosswise grooves (5) isolating the blocks (6) extending radially from base surface (3) of tread (2) to make at least one lengthwise row. Every block (6) has two lengthwise lateral surfaces (7) that make the boundaries of two appropriate lengthwise grooves (4) and two crosswise side surfaces (8) that make the boundaries of two appropriate crosswise grooves (5). At least one of units (6) has lateral channels (9) each being formed at side surface (7, 8) of appropriate block (6) to extend from base surface (3) of tread (2) to top surface (10) of block (6) to prevent radial extension of trapped snow from inner section of lateral channel (9).

EFFECT: perfected grip and snow-clad roads.

19 cl, 16 dwg

FIELD: transport.

SUBSTANCE: invention relates to pneumatic tire for vehicles, in particular to be used in winter conditions of driving. Tread is provided with multiple narrow sipes (4) which pass in transversal direction of tread in parallel to each other. Mutually opposite walls (5) of sipes contain mutually matching projections (6, 7) and recesses (16, 17). The projections (6, 7) are rounded raised areas. The projections (6) are located in separate areas in radially outer region of one sipe wall (5). In this structure, each of mentioned projections (6) has one flat side forming supporting surface (6a) oriented in radial direction and essentially perpendicular to sipe wall (5). The projections (7) are located in separate areas in radially inner region of one sipe wall (5). In this structure, each of mentioned projections (7) has one flat side forming supporting surface (7a) passing essentially in parallel to upper surface of positive profile.

EFFECT: better tire adhesion to ice-covered road surface while providing uniform wear of tire tread.

10 cl, 3 dwg

Pneumatic tire // 2525187

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to studless tire tread pattern. Tire (1) tread (2) has several (5R) crown blocks (5b) separated by crosswise crown grooves (8), two rows (6R) of mid blocks (6b) separated by mid crosswise grooves (9) and two rows (7R) of shoulder blocks (7b) separated by shoulder crosswise groves (10). Every crown crosswise groove (8) is level in lengthwise direction with one crosswise crown mid groove (9) so that crosswise groove (8) is located in area (Mc) of the mid crosswise groove confined by 1st and 2nd crosswise straight lines (Za and Zb). The latter extend through 1st and 2nd extreme ends (9a, 9b) of the mid crosswise groove (9), respectively. Longitudinal length of crosswise mid groove are (Mc) makes at least 25% but not over 50% of pitch length (P) confined by 1st extreme ends (9a, 9b). Are (Mc) of mid crosswise groove does not overlap anyone shoulder crosswise groove (10).

EFFECT: better bite.

8 cl, 7 dwg, 1 tbl

Pneumatic tire // 2524522

FIELD: transport.

SUBSTANCE: invention relates to vehicle tread pattern. Pneumatic tire (1) contains tread (2) which includes projections (23) formed by longitudinal grooves made in longitudinal direction of tire and by transversal grooves (24) crossing longitudinal grooves. The transversal grooves (24) in longitudinal direction of tire form multiple pitches (P1, P2 and P3) of tread pattern. In this structure, in the tread (2) shoulder, as tread pattern pitch decreases the volume ratio of transversal grooves (24) in the volume of portion corresponding to tread pattern pitch increases, and in the central zone of tread (2), as tread pattern pitch decreases the volume ratio of transversal grooves in the volume of portion corresponding to tread pattern pitch decreases.

EFFECT: higher stability of vehicle driving while keeping tread uniformity.

4 cl, 5 dwg

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

15 cl, 19 dwg

Pneumatic tire // 2521052

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

9 cl, 5 dwg, 1 tbl

High-capacity tire // 2541553

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, particularly, to high-capacity tires. Tire comprises tread with blocs each being provided with zigzag-like blade made at the surface of contact with soil. Relationship between bloc length A measured in straight line crossing the centre of gravity of said contact surface and bloc maximum width (B) making the axial spacing between the most remote edges of said contact surface varies from 0.8 to 1.7. Said zigzag blade is located at central area extending from the centre of gravity of said contact surface on both sides of lengthwise direction through 25% of block length (A). Said zigzag-blade consists of two straight larger length sections extending axially inward from both sides of the blocs in the tire axial direction. Besides, it includes straight section of smaller length extending between inner ends of said larger-length sections so that lengthwise spacing between said most remote ends of said blade varies from 10 to 35% of bloc length (A).

EFFECT: reduced stepwise wear at sufficient road grip.

8 cl, 6 dwg

Pneumatic tire // 2537987

FIELD: transport.

SUBSTANCE: invention relates to motor tire tread pattern. Tire tread is provided with blocks each one of which has surface of block wall facing transversal groove tilted at an angle (Θ) of 5 to 40 degrees relative to axial tire direction and thus forming acute-angled edge and obtuse-angled edge of block. Block wall surface between acute-angled edge and obtuse-angled edge is provided with at least two slots of 0.3 to 2.0 mm in width. Distance P2 measured from acute-angled edge to one of at least two mentioned slots the nearest to acute-angled edge is greater than distance P1 measured from mentioned obtuse-angled edge to one of at least two mentioned slots the nearest to obtuse-angled edge. Each distance is measured along radially outer edge of block wall surface to slot centre across width.

EFFECT: tire noise reduction.

10 cl, 5 dwg, 1 tbl

Winter tire // 2531435

FIELD: transport.

SUBSTANCE: invention relates to winter tire. Tire (1) comprises multiple blocks (6a, 6b), at least one slit-like retaining-type drain groove (6a, 6b) extending in at least one block of said set in, in fact, axial direction (X) defined at said tread band. Said first slit-like retaining-type drain groove is configured to make between the first (8) and the second (9) parts of the block at least two separate joints (11) of "recess-ledge" type separated by said first groove to rule out the relative shifts of said blocks in whatever direction (A).

EFFECT: better grip on wet, snowy or icy roads.

16 cl, 2 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: invention relates to tread of tires to be used in winter. Winter tire (1) has tread (2) with relied patter composed of multiple lengthwise grooves (4) and crosswise grooves (5) isolating the blocks (6) extending radially from base surface (3) of tread (2) to make at least one lengthwise row. Every block (6) has two lengthwise lateral surfaces (7) that make the boundaries of two appropriate lengthwise grooves (4) and two crosswise side surfaces (8) that make the boundaries of two appropriate crosswise grooves (5). At least one of units (6) has lateral channels (9) each being formed at side surface (7, 8) of appropriate block (6) to extend from base surface (3) of tread (2) to top surface (10) of block (6) to prevent radial extension of trapped snow from inner section of lateral channel (9).

EFFECT: perfected grip and snow-clad roads.

19 cl, 16 dwg

FIELD: transport.

SUBSTANCE: invention relates to pneumatic tire for vehicles, in particular to be used in winter conditions of driving. Tread is provided with multiple narrow sipes (4) which pass in transversal direction of tread in parallel to each other. Mutually opposite walls (5) of sipes contain mutually matching projections (6, 7) and recesses (16, 17). The projections (6, 7) are rounded raised areas. The projections (6) are located in separate areas in radially outer region of one sipe wall (5). In this structure, each of mentioned projections (6) has one flat side forming supporting surface (6a) oriented in radial direction and essentially perpendicular to sipe wall (5). The projections (7) are located in separate areas in radially inner region of one sipe wall (5). In this structure, each of mentioned projections (7) has one flat side forming supporting surface (7a) passing essentially in parallel to upper surface of positive profile.

EFFECT: better tire adhesion to ice-covered road surface while providing uniform wear of tire tread.

10 cl, 3 dwg

Pneumatic tire // 2526573

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile tire intended to be used on ice. On the surface of tire crown zone located between both edges of tread there are multiple grooves positioned in circumferential direction of tire; multiple transversal grooves located in transversal direction of tire. Each of transversal grooves has point of curvature between main grooves and/or between main groove and tire edge so that they have convex from in circumferential direction of tire. Multiple main grooves and multiple transversal grooves from multiple separate blocks each one of which includes circumferential projection of shape that coincides with convex form of transversal grooves. Each of the blocks contains at least one transversal lamel located in tire transversal direction and coinciding in its shape with transversal grooves where transversal lamel size in tire transversal direction is equal to size of block with transversal lamel located in it if both ones are projected on one plane including tire rotation axis and perpendicular to block surface.

EFFECT: better tire friction properties on ice.

10 cl, 6 tbl, 14 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

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

15 cl, 19 dwg

FIELD: transport.

SUBSTANCE: tire has tread (1) including at least one groove (3) of circular orientation and multiple raised elements (21, 22). Note here that every said raised element comprises contact side (11) with crosswise width Lt and lateral walls (210). Note also that there is at least one raised element with multiple noise killing devices. Note that every said device has elongated cavity (4) of total volume Vc to open toward lateral wall (210). Note that said cavity features total length Lc larger than said length Lt and geometry that includes several interconnected parts (40, 41, 42, 43, 44, 45). Note also that length Lc makes the sum of parts of said cavity. Note that every said cavity (4) extends over the entire length Lc with notch (5) extending radially outward out to rolling surface. Note that sum tread sum Ly of lengths in projection in crosswise direction of every cavity is at least 1.5 times larger than the sum Lx of length in projection if the cavity circumferential direction.

EFFECT: perfected noise killing.

9 cl, 8 dwg

Pneumatic tire // 2521455

FIELD: transport.

SUBSTANCE: pneumatic tire includes tread section which contains ring grooves (2-4) running in circular direction of tire, as well as lateral grooves (5, 6) running in direction of tire width, and multiple road-contacting blocks (7), separated by ring and lateral grooves. Each of road-contacting blocks contains lamellae (8), which run from tread running surface inside blocks to specified depth in radial direction of tire, herewith, each one of lamellae has end section communicating with at least any one of ring and lateral grooves. At least one of multiple lamellae contains widening ring-shaped section on its inner end in radial direction of tire. Herewith, the widening ring-shaped section is increased in its diameter gradually and smoothly running to side walls of road-contacting block.

EFFECT: creation of pneumatic tire with high drainage effect, as well as prevention of tearing lamella in tire tread.

9 cl, 12 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

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