High-capacity tire

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. High-capacity tire includes tread provided with central longitudinal groove, crown longitudinal grooves at each side of this groove and crown lateral grooves passing between them thus crating blocks of crown. Crown block is additionally divided in longitudinal direction into two parts of the block by narrow groove of crown. Lateral groove of crown is provided at its bottom with web extending from bottom and connecting two crown blocks being adjacent in longitudinal direction. Lateral grooves of crown are inclined at an angle α of 10 to 30 degrees relative to axial direction of tire. The central longitudinal groove and axially-inner part of lateral crown groove which is located at axially inner side of web are of least depth than longitudinal groove of crown.

EFFECT: better tread self-cleaning of stones without creation of cracks at the bottom of groove and without performance degradation on wet road surface.

8 cl, 4 dwg, 1 tbl

 

The present invention relates to a pneumatic tire, more particularly to a heavy duty tire having a tread pattern consisting of blocks, which provides improved cleaning of stones captured by the grooves of the tread.

In the case of heavy duty tires for trucks, etc., developed for use on both paved and namewinner roads, for example, on gravel roads, construction sites, and provided with a tread pattern of the blocks to ensure sufficient grip on namewinner roads, there is a tendency that the small stones or hard objects on the road are captured by the grooves of the tread.

If the captured stones remain in the grooves and repeatedly hit the bottom of the grooves during movement, there is a possibility of damage to the bottom of the grooves, and pageprotection reinforcing layer cords, and therefore the durability of the tread is getting worse. Thus, there is a problem that the rate of recovery of used tyres is reduced.

Therefore, to prevent the capture of stones previously used the following techniques:

(a) providing the inclination of the side walls of the grooves so that the width of the groove gradually increases from the bottom of the groove to open the top, for example, as described in JP-2002-337514-A;

b) forming�tion of the tread grooves, it includes independent platform, protruding from the bottom of the grooves, for example, as described in JP-11-180112, and

b) reducing the width of the open part of the groove of the tread.

However, in the case of technical acceptance (a), provided that the width of the open top of the groove should not be changed, the width of the bottom of the groove decreases as the inclination of the side walls increases. Consequently, it becomes difficult to form the bottom of the grooves with large arc (in cross section). As a result at the bottom of the groove, due to repeated deformation during movement, may cause cracks.

In the case of technology acceptance (b) to form a platform independent, requires a relatively large width of the groove at the bottom, and therefore it becomes difficult to ensure the inclination of the side walls of the groove so that the stone was easy to retrieve.

In the case of technology acceptance (in) characteristics on wet roads (drainage) have the tendency to deterioration.

Thus, the aim of the present invention is to provide a heavy duty tire in which, to prevent damage to the bottom of the grooves and pageprotection reinforcing layer cords, improve self-cleaning of the tread from the captured stones that do not cause the formation of cracks at the bottom of the groove and degradation of performance on a wet road surface.

� accordance with the present invention heavy-duty tire comprises a tread, provided with a Central longitudinal groove located along the equator of the tire; the longitudinal grooves of the crown, located on each side of the Central longitudinal groove; transverse grooves of the crown extending from the Central longitudinal groove of the longitudinal groove of the crown so that the region between them in the longitudinal direction is divided into blocks of the crown; narrow grooves of the crown, located on the crown blocks so that they extend from the Central longitudinal groove of the longitudinal groove of the crown, additionally sharing in a longitudinal direction of the blocks of the crown into two pieces, and bridges located in the transverse grooves of the crown and protruding from the bottom of the grooves, connecting adjacent in the longitudinal direction of two unit of the crown;

in which transverse grooves of the crown is inclined at an angle α from 10 to 30 degrees relative to the axial direction of the tire, a Central longitudinal groove has a depth less than the depth of the longitudinal grooves of the crown, and an axially inner part of the transverse grooves of the crown, which is located on the axially inner side of the jumper has a depth less than the depth of the longitudinal grooves of the crown.

In the crown region of the tread ground pressure is relatively high, and the likelihood of damage to the captured stones are also relatively high. So transverse Kang�VCI of the crown in the crown region of the tread is inclined at an angle α as a result, captured stones can be easily moved during the movement along the direction of the transverse grooves of the crown.

Moreover, as the crown block is additionally divided in longitudinal direction into two parts block the narrow groove of the crown, during movement of the unit can be moved in the longitudinal direction of the tire, thus changing the width of the axial grooves of the crown. As a result, due to the synergetic effect of changing the width and inclination of the transverse grooves of the crown of stones captured by transverse grooves, are easily retrieved.

However, if the parts of the blocks move excessively, you may experience the so-called sawtooth (heel-and-toe wear in the blocks of the crown. Therefore, to support the bottom of the blocks and parts to prevent excessive movement of parts of the block, the transverse grooves of the crown is provided with a jumper.

In addition, the Central longitudinal groove and an axially inner part of the transverse grooves of the crown is made smaller than the longitudinal grooves of the crown. In other words, the thickness of the rubber tread on the bottom of the groove is increased. Thus, even if the seized hard stones fall out, due to high thickness rubber, damage pageprotection reinforcing layer cords can be avoided, and the durability of the tread and speed recovery ispolzovaniem can be increased.

Brief description of the drawings

Fig.1 shows a developed view showing an example of a pattern projector heavy-load tire according to the present invention.

Fig.2 shows an enlarged view of the main part of the projector of the tire in accordance with the present invention.

Fig.3(A) presents the cross-sectional view of the Central longitudinal grooves along the direction perpendicular to the longitudinal direction.

Fig.3(B) presents the cross-sectional view of the longitudinal grooves of the crown along the direction perpendicular to the longitudinal direction.

Fig.3(C) presents the cross-sectional view of the transverse grooves of the crown along the direction perpendicular to the longitudinal direction.

Fig.4 shows a cross sectional view along the line a-A in Fig.2.

Embodiments of the present invention is described in more detail with reference to the accompanying drawings.

In the drawings, heavy duty tire 1 of the present invention includes a tread 2, a limited surface 2s of the tread and is provided with a Central longitudinal groove 3 extending along the tire equator C; longitudinal grooves 4 of the crown, located on each side of the Central longitudinal grooves 3 and transverse grooves 6 of the crown extending from the Central longitudinal groove 3 to longitudinal grooves 4 crowns� so, what region Yc crown protector, which is limited by two longitudinal grooves 4 of the crown, divided into 5 blocks of the crown to form two longitudinal rows located between the Central longitudinal groove 3 and one of the longitudinal grooves 4 of the crown.

In this embodiment, the protector 2 is further provided with a longitudinal shoulder grooves 7 disposed axially outside of each longitudinal groove 4 of the crown; shoulder transverse grooves 9 extending from the shoulder longitudinal grooves 7 adjacent to the edge of The tread so that the shoulder region Ye tread, limited shoulder longitudinal groove 7 and the adjacent edge of The tread is divided into shoulder blocks 8, and middle transverse grooves 11 extending from the shoulder longitudinal grooves 7 adjacent to the longitudinal groove 4 of the crown so that the average area Ym protector, limited shoulder longitudinal groove 7 and the longitudinal groove 4 of the crown, divided by average units 10.

Accordingly, the protector 2 in this embodiment is provided on each side of the equator With tires near crown blocks 5 are arranged along the equator of the tire, near the shoulder blocks 8 arranged along the edge of The tread and a number of medium blocks 10 arranged between them. Thus, the block tread pattern consists of six rows of blocks.

Fig.3(A), 3(B) and 3(C) p�estaline cross-section of the Central longitudinal groove 3, longitudinal grooves 4 of the crown and transverse grooves 6 of the crown respectively perpendicular to the respective directions of the grooves along the length.

In this embodiment, as shown in the drawings, the side walls 3s Central longitudinal groove 3, the side walls 4s longitudinal grooves 4 of the crown and the sidewalls 6s transverse grooves 6 have the crown angle 9 less than 3 degrees relative to the direction perpendicular to the surface 2s of the tread.

This leads to more grooves on an open width of the groove and to improve the performance on wet road surface drainage and traction.

In the present invention, to control the capture area Yc crown protector, transverse grooves 6 of the crown is inclined at an angle a of 10 to 30 degrees relative to the axial direction of the tire, as shown in Fig.1. Thus, during the movement, there is axial movement (along the slope) of stones captured by transverse grooves 6 of the crown, which helps to improve the self-cleaning from the captured stones.

As shown in Fig.2, each of the blocks 5 of the crown is provided with a narrow groove 12 of the crown extending from the Central longitudinal groove 3 to the longitudinal groove 4 of the crown so that it further divides the block 5 of the crown in the longitudinal direction into two parts of the block 5A and 5B. The crown block is not divided d�ugih grooves (including the slats).

The narrow groove 12 of the crown has a width W12 of 0.5 to 1.0 mm on the surface 2s of the tread.

Due to the formation of narrow grooves 12 of the crown moving parts 5A and 5B of the blocks becomes freer in the direction towards or away from the adjacent transverse grooves 6 of the crown in the course of the movement, and therefore the width of the transverse grooves 6 changes every time when recessing a region of the tread comes in contact with the ground.

Therefore, due to this synergistic effect and the above-described inclination of the transverse grooves 6 of the crown self-cleaning from the captured stones can be further improved. If the angle α is less than 10 degrees, it becomes difficult to obtain such a synergistic effect. If the angle α is 30 degrees, it becomes difficult to obtain the required grip with the road.

However, if the parts 5A and 5B blocks move excessively, then you may experience a sawtooth wear on the front and rear of the unit 5 crown. Therefore, each transverse groove 6 of the crown is provided with a crosspiece 15.

Jumper 15 protrudes from the bottom of the grooves and passes between two adjacent blocks 15 of the crown so that connects these blocks. Thus restrain the movement of parts of blocks 5A and 5B in the direction towards or away from the transverse grooves 6 of the crown, and sawtooth wear and tear caused due to the narrow Kahn�wok 12 crowns can be minimized.

In this embodiment, the jumper is located so that the average axial direction position Pt jumper 15 is located closer to the equator With tires in relation to the average axial direction Rd of the transverse grooves 6 of the crown.

Thus part of the blocks 5A and 5B provided with greater support from the side of the tire equator than from the side edges of the tread (the contact pressure is higher from the equator than from the side edges of the tread), and the impact of the jumpers on 15 regulation of saw-tooth wear can be increased without increasing the size of the crosspiece 15, namely, without reducing the volume of the groove. Here, the average axial direction position Pt jumper 15 is in such a position on a radially outer surface of the crosspiece 15, which is on the Central line width (i) of the transverse grooves 6 of the crown. Average in axial direction the position of the Pt jumper 15 transverse grooves 6 of the crown is in this position to open the upper part of the transverse grooves 6 of the crown, which is on the Central line width (i) of the transverse grooves 6 of the crown.

In the present invention, as shown in Fig.4, the depth D3 of the Central longitudinal groove 3 and the depth H6i axially inner portion 6i transverse grooves 6 of the crown, which is located on the axially inner side of the crosspiece 15, �adaut so, to be less than the depth H4 of the longitudinal grooves 4 of the crown. Thus, in pertinent part, rubber protector that will capture and therefore there is a risk of damage in pageprotection reinforcing cord layer (the belt, the tie and the belt), the thickness of the rubber from the bottom of the groove for reinforcing the tread layer of the cord increases, and can be prevented damage to the reinforcing layer cords.

To this end preferably the difference between the depth of the grooves (H4-H3) and (H4-H6i) is not less than 5.0 mm but not more than 9.0 mm.

If this value is more than 9.0 mm, it becomes difficult to maintain the required characteristics of the drainage. If it is less than 5.0 mm, it becomes difficult to ensure a sufficient effect of preventing damage to reinforcing the tread layer cords.

In this embodiment, the depth No axially outer part 6o transverse grooves 6 of the crown, which is located axially outside jumpers from 15, is greater than the depth of the H6i above the axially inner portion 6i. Thereby provide uneven movement of parts 5A and 5B, which helps to improve the self-cleaning from the captured stone.

Preferably the depth No grooves axially outer part 6 is not less than the depth H4 of the longitudinal grooves of the crown. More preferably, the depth No grooves �is the same, as the depth H4 of the longitudinal grooves 4 of the crown, and the depth H6i grooves is the same as the depth DK of the Central longitudinal grooves 3. Thereby it is possible to minimize the stress concentration at the bottom of the groove.

Depth H15 jumpers (namely, depth of lintel 15 from the surface 2S of the tread) and depth of narrow grooves H12 12 of the crown is preferably from 40 to 60% of the depth H4 of the longitudinal grooves 4 of the crown. If the depth H15 jumpers or the depth of the grooves H12 is more than 60% of the depth H4 of the groove, then move the parts 5A and 5B of blocks is increased and it becomes difficult to control the occurrence of sawtooth wear. If the depth H15 jumpers or the depth of the grooves H12 is less than 40% of the depth H14 grooves, then the self-cleaning of the stones becomes insufficient.

Therefore, more preferably, when one of the depths H15 jumpers and H12 of the groove is 50 to 60% of the depth H4 of the groove, and the other is from 40 to 50% of the depth H4 of the groove.

In this embodiment, the depth No grooves axially outer part 6o and a depth H4 of the longitudinal grooves 4 of the crown is approximately 18 to 25 mm, and the depth DK of the Central longitudinal groove 3 and the depth H6i axially inner portion 6i is greater than the depth of the H15 jumper.

To further control the sawtooth wear, as shown in Fig.2, narrow Kanak� 12 crown in this embodiment provided in the form of "Z". The narrow groove 12 of the crown consists of the first main portion 12A extending from the Central longitudinal groove 3, the second main portion 12b extending from the longitudinal grooves of the crown 4 essentially parallel to the first main portion 12A, and a connecting portion 12C connecting the inner ends of the first main portion 12A and the second main portion 12b.

Internal angle γ between the connecting portion 12C and the first main part 12A and the interior angle between the connecting portion 12 C and the second main part 12b is at least 45 degrees, but not more than 90 degrees, preferably not more than 80 degrees.

Consequently, the parts 5A and 5B of the blocks can hold each other to control their excessive movement in the longitudinal direction, and thereby it is possible to reduce the sawtooth wear.

The first and second main parts 12A and 12b are essentially parallel to the transverse grooves 6 of the crown, and preferably the distance D between the first and second main parts 12A and 12b is from 2.0 to 10% of the length BL of the block 5 of the crown, measured perpendicular to the transverse groove 6 of the crown.

From the point of view of traction and driving stability, preferably the length BL of the block is 30 to 50 mm, and the minimum axial width BW (block width BW) unit 5 the crown is 30 to 40 mm.

In this embodiment, from the viewpoint of adhesion with �ear and capture stones, the Central longitudinal groove 3 is formed in the form of zigzag grooves, which consists of inclined main parts, inclined at an angle β from 1 to 15 degrees relative to the longitudinal direction of the tire, and 3b plots of inflection, passing between the main inclined portions 3A and tilted at an angle larger than the angle β in the longitudinal direction of the tire in the opposite direction inclined relative to the main portion 3A.

Such areas 3b inflection Central longitudinal grooves 3 can improve traction and braking force.

In this embodiment, the above narrow grooves 12 of the crown respectively cross sections of the 3 inflection Central longitudinal grooves 3. That is why the stones occupied inflection 3b, easy to move and fall out. The stones captured oblique main parts 3A and moved in sections 3b of inflection, they come out easily.

For the same reason, each transverse groove 6 of the crown intersects with one of the inclined main parts 3A of the Central longitudinal groove 3.

As shown in Fig.1, like the field Yc crown of the tread, shoulder area Ye tread, and, in addition, in the middle pane, Ym tread shoulder transverse grooves 9 and average transverse groove 11 is inclined at an angle α from 10 to 30 degrees relative to the axial eg�pursue tires, and the shoulder block 8 and the middle block 10 is provided with a shoulder narrow groove 17 and the middle narrow groove 18, respectively, further dividing the block 8 in the longitudinal direction into two parts 8A and 8B of blocks and the block 10 into two parts 10A and 10B units.

Thus, the shoulder transverse grooves 9 and secondary transverse grooves 11 provided with self-cleaning function of the stones.

To keep the sawtooth wear shoulder blocks 8 / medium 10, the shoulder transverse grooves 9 and secondary transverse grooves 11 are provided with crosspieces 20 and 21 projecting from the bottom of the respective grooves and connecting the two adjacent in the longitudinal direction of the block (two shoulder block 8, two middle block 10).

In the middle pane, Ym protector to primarily to provide drainage, the average transverse grooves 11 and the shoulder longitudinal grooves 7 are formed so that they have the same depth as the depth H4 of the longitudinal grooves 4 of the crown.

In the shoulder region Ye tread, in order primarily to ensure driving stability and resistance to uneven wear of the shoulder transverse grooves 9 are formed so that they are of lesser depth than the average transverse grooves 11, in this embodiment, essentially the same as the depth H6i axially inner portion 6i of the transverse grooves of the crown, namely from 0.9 to 1.1 depth H6i groove.

Sravnitel�testing

Were made of heavy-duty tires of size 11.00R20 (the size of the rim of 7.50×20) with the tread pattern shown in Fig.1, and the technical specifications presented in table 1, and tested to capture stones, uneven wear resistance and drainage.

1. Test drainage

Truck mounted with test tires (tire pressure 725 kPa) carried out a run on a wet road surface for a given route of bus testing and evaluate the characteristics of traffic on a wet road surface. The results are presented in the form of an indicator, based on the result for the comparative tire of comparative example 1 taken as 100, wherein the larger the value, the better the performance on wet road surface.

2. Test capture and resistance to uneven wear

The truck carried a run at a distance of 1500 km (gravel road: paved road = approximately 2:1). Then counted the number of captured stones in the crown region of the tread. The results are presented in the form of an indicator, based on the result for the comparative tire of comparative example 1 (see D. 1), taken as 100, wherein the larger the value, the better the capture of cameos.

Moreover, after driving for a distance of 1500 km were visually evaluated sawtooth wear of the blocks of the crown. Reza�Italy presented in the form of the indicator, based on the result for the comparative tire of comparative example 1 taken as 100, and the higher the value, the better the uneven wear resistance.

As shown in table 1, in the case of tires according to the embodiments of example 1 to example 6, due to the synergistic effect of inclination of the transverse grooves of the crown under an angle α, providing narrow grooves of the crown on the crown blocks, maintenance of bridges in the transverse grooves of the crown and the job of the depths H6i and NT is less than the depth H4, improved capture, while maintaining or enhancing the driving performance on wet roads and resistance to uneven wear.

Table 1
BusCP. D. 1PR.1PR.2CP. D. 2CP. D. 3CP. D. 4CP. D. 5PR.3PR.4PR.5PR.6
The depth H4 of the longitudinal grooves of the crown (mm)20,420,420,420,4 20,420,420,420,420,420,420,4
The depth DK of the Central longitudinal grooves (mm)The 15.4The 15.4The 15.4The 15.4The 15.4The 15.420,4The 15.4The 15.4The 15.4The 15.4
(N4)75757575757510075757575
Transverse groove of the crown angle α (deg.)010304010101010 101010
no
Lintel depth H15 (mm)10,210,210,210,2-10,210,210,28,28,28,2
(N4)50505050-505050404040
An axially inner part of the depth H6i (mm)The 15.4The 15.4The 15.4The 15.4The 15.4The 15.420,4The 15.4The 15.4The 15.4The 15.4
(N4)75 757575757510075757575
An axially outer part depth No (mm)20,420,420,420,420,420,420,4The 15.420,420,420,4
(N4)10010010010010010010075100100100
The narrow groove of the crown depth H12 (mm)no
10,210,210,210,210,2-10,210,28,210,212,2
(N4)5050505050-5050405060
The test results Capture1001051101109010080103105105105
The uneven wear resistance10010595 808080100105108105100
Drainage100105110115105951059595100100

1. Heavy duty tire comprising a tread provided with a Central longitudinal groove located along the equator of the tire; the longitudinal grooves of the crown, located on each side of the Central longitudinal grooves and transverse grooves of the crown extending from the Central longitudinal groove of the longitudinal groove of the crown so that the region between them in the longitudinal direction is divided into blocks of the crown; narrow grooves of the crown, located on the crown blocks so that they extend from the Central longitudinal groove of the longitudinal groove of the crown, additionally sharing in a longitudinal direction of the blocks of the crown into two pieces, and jumper located in the transverse grooves of the crown and protruding from the bottom of the grooves, connecting neighbor�ie in the longitudinal direction of two unit of the crown;
in which transverse grooves of the crown is inclined at an angle α from 10 to 30 degrees relative to the axial direction of the tire, a Central longitudinal groove has a depth less than the depth of the longitudinal grooves of the crown, and an axially inner part of the transverse grooves of the crown, which is located on the axially inner side of the jumper has a depth less than the depth of the longitudinal grooves of the crown.

2. Heavy-load tire according to claim 1 in which the axially outer side of the transverse grooves of the crown, located on the axially outer side of the jumper, deeper than the axially inner part of the axial grooves of the crown.

3. Heavy-load tire according to claim 2, in which a specified axial outer portion has the same depth as the longitudinal groove of the crown, and the axially inner portion has the same depth as the Central longitudinal groove.

4. Heavy-load tire according to claim 1, in which the middle of the bridge in an axial direction is located from the side of the tire equator from the middle in the axial direction of the transverse grooves of the crown.

5. Heavy-load tire according to claim 1, in which the side walls of the Central longitudinal grooves, the side walls of the longitudinal grooves of the crown and side walls of the transverse grooves of the crown is inclined at an angle θ of not more than 3 degrees relative to the direction perpendicular to the surface�resti protector.

6. Heavy-load tire according to claim 1, in which the depth of the lintel and the depth of the narrow grooves of the crown range from 40 to 60% of the depth of the longitudinal grooves of the crown.

7. Heavy-load tire according to one of claims.1-6, in which a Central longitudinal groove is a zigzag groove, consisting of inclined main parts, inclined at an angle β from 1 to 15 degrees relative to the longitudinal direction of the tire, and plots of inflection, inclined connecting the main part and is tilted in the opposite direction inclined with respect to the main parts in the longitudinal direction of the tire.

8. Heavy-load tire according to claim 7, in which a narrow longitudinal groove intersects with the plot of inflection of the Central longitudinal grooves.



 

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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

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 // 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

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