Winter tire

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

 

The present invention relates to a winter tire provided with the tread bracelet, in which slit drainage grooves made with a configuration that is designed, in particular, to improve the adhesion of the tyre with the road on a dry road surface without adversely affecting the characteristics of grip on wet or snow covered or icy road surface.

It is known that during dry road tire having a tread bracelet with a smooth surface (buswith a smooth tread), provides the characteristics of the grip, superior characteristics similar tires, which, with similar other characteristics, has a tread bracelet, the surface of which is made with grooves defining multiple blocks, which are made with a slit drainage grooves. Essentially, this is because the tread bracelet with smooth surface provides more surface contact with the ground and has a higher rigidity when exposure exposure to shear stress (or shear stresses).

On the other hand, on wet or snow-covered road surface, the tire tread with the bracelet, which has a smooth surface, provides operational characteristics that are significantly worse than the operational nature of the stick, provide the same tire tread bracelet which has a surface made with slit drainage grooves and recesses. Indeed, the implementation of these grooves and recesses is essential to ensure the possibility of leakage of water that may be present on the road surface, and to avoid cases of lifting tires (aquaplaning), slit drainage grooves made in the tread blocks bracelet, provide an opportunity to improve the grip of the tires on the snow-covered road surface because of their ability to keep the inside of the snow, which, as is known, can provide more friction on the snow present on the road surface, in comparison with friction, which is ensured by protective bracelet.

Therefore, bus, suitable for driving in all road conditions, mentioned above, must satisfy the requirement of a harmonious combination of opposite configuration requirements so that execution of the grooves on the tread bracelet and execution of slit drainage grooves on the blocks defined by the grooves of the tread pattern was optimized in accordance with the specified requirements when using.

One of the causes of lack of grip of the tire p is tectorum bracelet with grooves, can be connected with low resistance blocks the effects of shear stresses, which leads to their excessive deformation. This disadvantage becomes more apparent when the blocks are made with a slit drainage grooves.

It should be stated that in the context of the present description, the term "slit drainage groove" is intended to denote a small grooves made in the block and having a width of from 0.1 to 1.5 mm and a depth of from 1 to 15 mm

In addition, the term "connection type protrusion-depression" hold in the direction of the tangent"relevant in the context of this description to the two parts of the block, is intended to denote a connection between two parts, which is designed in such a way as to prevent displacement of these parts relative to each other in any direction, which in the area of the block is a essentially a direction tangent to the surface of the block, the outer in the radial direction, which forms a part of the surface of the tire tread.

The term "slit drainage groove restraint type" is intended to denote a slit drainage grooves are designed so that part of the block that it determines have at least one connection protrusion-depression" hold in the direction of the tangent.

With another hundred the ons, the term "slit drainage groove neuderjimogo type" is intended to denote a slit drainage grooves are designed so that part of the block that it determines have no connection type protrusion-depression" hold in the direction of the tangent.

In addition, the term "direction tangent" relative to the tread surface at some point intended to denote any direction, "owned" a plane tangent to the tread surface at the given point. In relation to the blocks of the tread bracelet tangent plane as a first approximation, can be identied with the plane on which rolls the tire, when the blocks are in contact with the road surface.

In the European patent 1195271 shows the tire in which the tread bracelet made with many blocks, stretching one after another in the circumferential direction of the tread of the bracelet when each block is executed first set slit drainage grooves restraint type extending in the axial direction and intersecting the second set slit drainage grooves restraint type extending in the circumferential direction, in such a manner as to divide each block type puzzle.

In the document JP 2000-25419 shows the bus, in which PR is tectomy bracelet made with lots of blocks, stretching one after the other down the length of the tread bracelet in the circumferential direction, with each unit made a lot slit drainage grooves restraint type extending in the axial direction. In accordance with the idea of this document, each slit drainage groove restraint type is made with the possibility of formation of a single connection type protrusion-depression" hold in the direction of the tangent between the two parts of the block, separated by narrow drainage ditch.

In the document GB 742821 among the various embodiments described therein is shown a tire, the tread bracelet which is made of blocks, each of which extends over the entire length of the tread bracelet in the circumferential direction, and each of which has one slit drainage ditch, which runs in the circumferential direction of the block and is made with the possibility of formation of a continuous sequence of connections of type "protrusion-depression", which are held in a direction tangentially between the two parts of the block, separated by narrow drainage ditch.

First, the applicant has verified that the presence of slit drainage grooves restraint type in blocks provides increase their rigidity when the exposure blocks the effects of tense is th shift to improve the operational characteristics of the tires when driving on dry roads as during braking and during application of traction force, as well as when driving in turns.

Further, the applicant has found that the rigidity of the block is increased for a given number of slit drainage grooves restraint types that are available in it, if you increase the number of connections of type "protrusion-depression" hold in the direction of the tangent, which are formed by each slit drainage grooves restraint type between the two parts of the block. In particular, the applicant has verified that slit drainage grooves restraint type, provided with only one connection type protrusion-depression" hold in the direction of the tangent, can be very effective, especially when they are made in blocks having a substantial surface area.

The applicant also noted that the possibility of relative displacement in the radial direction of the parts of the block, separated by narrow drainage ditch, gives the tire improved performance when driving in wet conditions or snow covered or icy road surface.

By designing and testing blocks with different configurations slit drainage convocatorias type, the applicant has established, in units of this type, which are described, for example, in EP 1195271, there was a state of deadlock parts of the block formed by slit drainage grooves, which effectively prevented any relative displacement of the parts of the blocks in the radial direction, resulting in deteriorated characteristics of adhesion of the tires with the road when driving on wet or snow covered or icy roads. Actually blocks "behaved" very similar to the bus with blocks without slit drainage grooves.

Further, the applicant has realized that to meet the above-mentioned various requirements needed to optimize the configuration and location of slit drainage grooves restraint type in the block so as to provide as effectively as possible, the interlocking parts of the block, separated by narrow drainage grooves restraint type, in relation to their displacement relative to each other in any direction tangent to the tread surface so that, nevertheless, it did not limit the possibility of displacement of these parts of the block relative to each other in the direction at an angle to the tread surface.

In conclusion, the applicant has found that by performing one or more slit drainage grooves by keeping the existing type, extending in the axial direction in multiple units so that each slit drainage groove has at least two connection type protrusion-depression" hold in the direction of the tangent, and while avoiding the presence of slit drainage grooves restraint type, intersecting each other within the blocks, get the bus, which provides optimum traction when driving as on wet or snow covered or icy roads and dry roads.

In particular, in accordance with its first aspect the invention relates to a bus containing:

- tread bracelet, which formed the tread surface, the outer in the radial direction;

- first set of blocks made in the specified tread bracelet;

at least, the first slit drainage retaining groove type extending in at least one unit from the specified first set, in essentially the axial direction on the specified tread bracelet;

when specified, the first slit drainage groove is made with a possibility of formation between the first and second parts of the block, separated by the specified first slit drainage groove, at least two individual p is x and a clear connection type protrusion-depression" so, to prevent the offset of the specified first and the second parts of the block relative to each other in any direction, which is specified in the block represents, essentially, the direction tangent to the tread surface, and with the possibility of a displacement of the specified first and the second parts of the block relative to each other in the direction at an angle to the tread surface, with the specified first slit drainage groove intersects with the specified block any other slit drainage retaining groove type.

The applicant has found that, thus, part of the block, separated by narrow drainage retaining groove type, effectively held relative to each other in such a way as to provide giving optimum rigidity of the block when its exposure to the effects of shear stresses, even when the block is of considerable length in the axial direction. However, at the same time, due to avoid intersections between slit drainage grooves holding the type of the unit, which are separated by a slit drainage retaining groove type, retain sufficient capacity to offset each other in the radial direction.

In accordance with the above aspect of the present izaberete what I can have, at least one of the preferred characteristics specified in the further description.

In the specified at least one unit from the specified first set is preferably the second slit drainage groove neuderjimogo type, made with the possibility of a displacement relative to each other corresponding parts of the block, separated by the specified second slit drainage groove in at least one direction, essentially tangent to the tread surface.

Thus, it is envisaged that as the slit drainage grooves holding type and slit drainage grooves neuderjimogo type is executed in the same block. Thus, in the same block can be performed all slit drainage grooves that are considered necessary to ensure the functionality of the corresponding traction when driving on wet or snow covered or icy roads, there is no limitation related to the use of only slit drainage grooves holding type, which can lead to an overly rigid connection between the parts of the block, leading essentially to the blocking of the possibility of displacement relative to each other.

On the contrary, the number of slit drainage ka is AVOK restraint type and number of slit drainage grooves neuderjimogo type can be properly balanced.

At least one unit from the specified first set is preferably at least two first slit drainage grooves restraint type, located at some distance from each other and extending in the specified essentially axial direction.

More preferably, if between these two first slit drainage grooves restraint type extends, at least one second slit drainage groove neuderjimogo type.

As a result of tests it was proved that this sequence located at intervals within the same block slit drainage grooves holding type and slit drainage grooves neuderjimogo type allows you to provide the best balance of the above requirements to the rigidity of the block relative to the tangent to the stress and simultaneously to freedom of displacement of parts of the block relative to each other in the radial direction. It should be noted that this characteristic is missing part of the block, bounded on both opposite sides of the two retaining slit drainage grooves.

Also preferably, the specified second slit drainage groove extending essentially parallel to the specified first slit drainage groove of the holding type.

In accordance with a preferred characteristic of the invention above, at least two first slit drainage retaining groove located at a distance from each other, comprising from 3 to 30 mm

In each block from the specified first set is preferably at most three slit drainage grooves restraint type.

Thus, avoid a situation in which a slit-like drainage grooves holding type are too close to each other, resulting in excessive retention of the unit, located between them, and the lack of freedom of relative displacement in the radial direction.

In accordance with a preferred sign of blocks from the specified first set extend mainly in the specified axial direction.

In accordance with another preferred characteristic blocks from the specified first set extend predominantly in the circumferential direction specified on the specified tread bracelet.

Thus, slit drainage grooves restraint type extend in the axial direction as in the blocks, extending mainly in the axial direction, and the blocks extending predominantly in the circumferential direction, to maintain configuration delevigne the drainage grooves, which helps traction when driving on wet or snow covered or icy roads in the case of tangential stresses essentially coplanar with respect to the district direction, which is typical for situations application of traction and braking at the wheels, which run parallel to the movement of the vehicle.

In accordance with a preferred characteristic in the specified tread the bracelet is made the second set of blocks extending predominantly in a direction inclined with respect to the specified axial direction and direction to the district, set on the specified tread bracelet, and in at least one unit of the specified second set of at least first slit drainage groove restraint type extends essentially parallel to the inclined specified direction.

In accordance with another preferred characteristic in the specified tread the bracelet is made the second set of blocks extending predominantly in a direction inclined with respect to the specified axial direction and direction to the district, set on the specified tread bracelet, and at least one unit of the specified second set of at least first slit drainage groove to hold the type extends, essentially perpendicularly to the specified inclined direction.

Thus, when the blocks extending in an inclined direction, also performed on the surface of the tread, receive the configuration of the retaining slit drainage grooves that promotes traction when driving on wet or snow covered or icy roads in the case of tangential stresses, transverse with respect to the district direction, which is typical for situations application of traction and braking at the wheels, which are located at an angle to the movement of the vehicle, or when you turn.

For each direction representing a direction essentially at a tangent to the tread surface, in the area specified connection type protrusion-depression" preferably formed of at least two separate plot specified first slit drainage grooves holding type, the projections of which in the direction shown superimposed on each neoclarityn section.

Thus, the two parts of the block, separated by narrow drainage retaining groove type, are held relative to each other regardless of the direction of force applied even to only one of the parts of the unit, provided that the direction of the pre which is a direction tangent. In other words, the two parts of the block behave like a single element in their exposure to the effects of shear stresses.

The configuration of the specified first slit drainage grooves restraint type preferably formed through consistent repetition of basic geometric module along the length of the specified first slit drainage grooves restraint type.

Thus, when the block parts are exposed to shear stress, provided their essentially uniform characteristics throughout their length.

In a preferred embodiment of the invention indicated at least two connection type protrusion-depression" are compounds of type "dovetail".

More preferably, if specified, at least two connection type protrusion-depression" performed essentially identical.

This feature makes it possible to avoid or at least limit in a holding slit drainage groove zone, in which the holding effect between the two parts of the block varies considerably, resulting in a lack of uniform distribution of forces.

In addition, this feature makes it possible to facilitate the manufacture of inserts required for formation of a holding slit drainage grooves during stage four the Finance sacrificial bracelet.

Particularly preferably, if between two consecutive connections type protrusion-depression" between the said first part and the second part is formed by connection type protrusion-depression" between the said second part and the first part having a configuration that is essentially identical, but has the opposite direction in relation to these two next to each other to join the protrusion-depression".

This characteristic allows a connection between the two parts of the block, separated by the retaining slit drainage groove, which is completely uniform along the length of the holding slit drainage grooves.

Specified the first slit drainage groove restraint type preferably extends in the specified block of the specified first set in a direction essentially perpendicular to the tread surface.

Thus, at the stage of manufacturing tires facilitated the extraction operation inserts, which are necessary to form the retaining slit drainage grooves in the forming stage.

The characteristics and advantages of the invention will become more apparent from the detailed description of the preferred described as an example of his variant Khujand the exercise of, illustrated by non-limiting example with reference to the attached drawings, on which:

figure 1 is a schematic view of a tire made in accordance with the present invention;

figure 2 is a view of part of the tread bracelet tire of figure 1 on an enlarged scale;

figure 3 is a view of the zone part of the sacrificial bracelet of figure 2 in an even more enlarged scale.

On the attached drawings reference character 1 indicates generally a tire made in accordance with the present invention.

The tire 1 has a design of the tyre, which in itself is conventional and is not shown in the attached drawings, and includes a tread bracelet 2, which is located radially on the outside of the tire 1, and which formed the tread surface 3, identified as the tread surface of the bracelet 2, the outer in the radial direction and intended to enter into contact with the road surface 4, as shown schematically in figure 1, for rolling thereon bus 1.

On the tread bracelet 2 has many pockets, which usually can have different sizes and directions, and which in the preferred example described and illustrated in this description represent a circumferential recesses 5A extending essentially, PA is allele district Y-direction, set in the tread bracelet 2, axial recesses 5b, extending essentially parallel to the axial direction X defined on the tread bracelet 2, and inclined recesses 5C, stretching so that they are inclined relatively to the County Y-direction and in the axial direction X.

Grooves 5A-5C define the boundaries and provide education relevant sets of blocks arranged in series along the scan sacrificial bracelet 2 in the circumferential direction.

In particular, established the first set of blocks extending predominantly in the axial direction or predominantly in the circumferential direction, which are respectively indicated in figure 2 by the reference positions 6A and 6b, and the second set of blocks 7, which extends mainly in the Z-direction which is inclined relative to the axial direction X and the relative circumferential direction Y.

Each block 6A, 6b of the first set includes at least a first slit drainage groove 10 restraint type, extending essentially in the axial direction X along the entire length of the block in an axial direction so that it divides the block 6A, 6b on the first and second parts of the block, indicated respectively by the reference positions and 9.

In each block 6A, 6b is preferably two or three first slit drainage grooves 10 extending in the axial direction and located at a distance from each other, which is from 3 to 30 mm

Each first slit drainage groove 10 is arranged to provide education between the parts 8 and 9 of the block, at least two connections 11 type protrusion-depression", which are separate and distinct and which are held in the direction of the tangent. In other words, compound (11) is designed in such a way as to prevent displacement of the parts 8, 9 of the block relative to each other in any direction And that in the area of the specified block 6A, 6b to which they belong, represents, essentially, the direction tangent to the surface 3 of the tread (shown as the example shown in figure 1).

However, each first slit drainage groove 10 extends to the inner side of the block 6A, 6b, essentially perpendicular to the tread surface 3 thus, to allow displacement of the parts 8, 9 of the block relative to each other essentially in the radial direction.

In addition, in each block 6A, 6b is executed at most three first slit drainage grooves 10, and none of them intersects with another slit Dre the most important retaining groove type.

In the preferred example described herein, the compound (11) type protrusion-depression" are compounds of the type dovetail, although can be used in other configurations, provided that they can provide the holding parts 8, 9 of the block in the direction of the tangent, parts 8, 9 of the block divided by the first slit drainage groove 10, as described above.

In particular, suitable first slit drainage grooves, which have a configuration in which for each direction And representing, essentially, the direction tangent to the tread surface 3, in the connection zone 11-type protrusion-depression" is composed of at least two separate part of the first slit drainage grooves 10, the projections of which in the direction And superimposed on each other metoclopram. Figure 3 shows as an example a situation in which relative direction And tangent to the surface 3 of the tread area unit 6A formed sections 13A, 13b and 13C of the first slit drainage grooves 10, the projections of which in the direction of a straight line perpendicular to the given direction, superimposed on each other in the zone 14.

In addition, each first slit drainage groove 10 is made with such a configuration that it has a serial repetition of one and that is about the same basic geometric module, providing education connection type "dovetail". Thus, compound (11) type protrusion-depression"essentially identical to each other and extend mainly in the axial direction as particularly evident for blocks 6A, each first slit drainage groove 10 provides the formation of a continuous sequence of compounds 11 type protrusion-depression" between the parts 8, 9 of the block.

In addition, it should be noted that with this configuration between the two compounds 11 type protrusion-depression", following each other, is formed by the connection 12 type protrusion-depression, formed with essentially the same configuration, but with opposite direction with respect to compounds 11 type protrusion-depression".

In addition, in each block 6A, 6b in a place located between the first slit drainage grooves 10 and essentially parallel to them, a second slit drainage groove 20 neuderjimogo type.

In accordance with the definition given above, the second slit drainage groove 20 is made with a configuration that enables the displacement of the respective parts 21, 22 of the block, separated by the groove, relative to each other at least in one direction, essentially tangent to the surface 3 of the protector. In p edocfile example, described in this description, the parts 21, 22 of the block can be moved relative to each other in the circumferential direction Y.

The blocks 6A, extending mainly in the axial direction can be reduced circuit size ("short step") or larger in the circumferential direction ("long step"). As the first and last performed with two first slit drainage grooves 10 extending from the sides of the box 6A, opposite in the circumferential direction, while the number of second slit drainage grooves 20 located between the first slit drainage grooves 10 varies: in the case of blocks with a short step performed by only one second slit drainage groove 20, while in the case of blocks with long stride made two second slit drainage grooves 20.

It should be noted that no part of the block is not limited along the corresponding sides in the axial direction, only the first slit drainage grooves 10.

Similarly, the blocks 6A, 6b also in blocks 7, which extends mainly in the Z-direction, made the first slit drainage grooves 30 restraint type. The first slit drainage grooves 30 may extend essentially parallel to the inclined direction Z or, on the contrary, essentially perpendicular Naklo the resultant z direction.

In addition, also in blocks 7 can be performed by the second slit drainage grooves 31 neuderjimogo type spaced from the first slit drainage grooves 30 and essentially parallel to them.

The applicant was subjected bus 1 test to determine adhesion with the road, particularly during braking and to determine characteristics when driving on various road canvas (covered in snow, wet and dry) and compared the results with the bus, which is very similar in size, composition and tread pattern, but with blocks made with slit drainage grooves neuderjimogo type.

The results, as illustrated in table 1, show operational characteristics when driving on snow-covered road surface, which were very similar for the two tires, while in traffic conditions on wet and dry road performance, provide a tire made in accordance with the present invention, proved to be significantly better.

Table 1
Comparative tireThe tire according to the invention
Braking on snow00 100
Traction on snow100100
Characteristics when driving on snow100105
Braking on a wet road100103
Grip on wet road100105
Characteristics when driving on a wet road100100
Braking on dry road100105
Characteristics when driving on dry road100105
The longitudinal rigidity of the tread100100

1. Bus (1), containing:
- tread bracelet (2)on which is formed the surface (3) of the tread, the outer in the radial direction;
- first set of blocks (6A, 6b), performed on the specified tread bracelet;
at least, the first slit drainage groove(10) restraint type, passing at least one block from the specified first set, essentially in the axial direction (X)defined on the specified tread bracelet;
when specified, the first slit drainage groove is made with a possibility of formation between the first (8) and second (9) parts of the block, separated by the specified first slit drainage groove, at least two separate and distinct connections (11) type protrusion-depression" to prevent the offset of the specified first and second parts of the block relative to each other in any direction (A), which is in the specified block represents, essentially, the direction tangent to the tread surface, and to allow displacement of the mentioned first and second parts of the block relative to each other in the direction at an angle to the tread surface, with the specified first slit drainage groove intersects with the specified block any other slit drainage retaining groove type, with the specified at least one unit (6A, 6b) from the specified first set a second slit drainage groove (20) neuderjimogo type, made with the possibility of a displacement relative to each other corresponding parts (21, 22) of the block, separated by the specified second is eleveno drainage groove, in at least one direction, essentially tangent to the tread surface.

2. The tire according to claim 1, in which indicated at least one unit (6A, 6b) from the specified first set completed at least the first two slit drainage grooves (10) restraint type, located at some distance from each other and extending in the specified essentially axial direction.

3. The tire according to claim 2, in which between these two first slit drainage grooves (10) restraint type extends, at least one second slit drainage groove (20) neuderjimogo type.

4. The tire according to claim 3, in which the second slit drainage groove (20) extends essentially parallel to the specified first slit drainage grooves (10) restraint type.

5. Tire according to any one of claim 2 to 4, in which indicated at least two first slit drainage grooves (10) restraint type located at a distance from each other, comprising from 3 mm to 30 mm

6. The tire according to claim 1, in which for each block from the specified first set is provided by at most three slit drainage grooves (10) restraint type.

7. The tire according to claim 1, in which the blocks (6A) from the specified first set extend mainly in the specified axial direction the attachment.

8. The tire according to claim 1, in which the blocks (6b) from the specified first set extend predominantly in the circumferential direction specified on the specified tread bracelet.

9. The tire according to claim 1, in which the specified tread the bracelet is made the second set of blocks (7)extending mainly in the direction (Z), inclined with respect to the specified axial direction and direction to the district, set on the specified tread bracelet, with at least the first slit drainage groove (30) restraint type extends essentially parallel to the specified inclined direction, at least one unit (7) from the specified second set.

10. The tire according to claim 1, in which the specified tread the bracelet is made the second set of blocks (7)extending mainly in the direction (Z), inclined with respect to the specified axial direction and direction to the district, set on the specified tread bracelet, with at least the first slit drainage groove (30) restraint type extends essentially perpendicular to the specified inclined direction, at least one unit (7) from the specified second set.

11. The tire according to claim 1, in which for each direction (A)representing a direction essentially at a tangent is the specified surface (3) of the tread, in the specified connection (11) - type protrusion-depression" is composed of at least two separate plot (13A, 13b) of the first slit drainage grooves (10) restraint type, the projections of which in the direction shown superimposed on each neoclarityn section (14).

12. The tire according to claim 1, in which the configuration of the specified first slit drainage grooves (10) restraint type formed through consistent repetition of basic geometric module along the length of the specified first slit drainage grooves restraint type.

13. The tire according to claim 1, in which indicated at least two compounds (11) - type protrusion-depression" are compounds of type "dovetail".

14. The tire according to claim 1, in which indicated at least two compounds (11) - type protrusion-depression" performed essentially identically.

15. The bus 14, in which between two consecutive connections (11) type protrusion-depression" between the said first part (8) of the block and the specified second part (9) of the block formed by the connection (12) - type protrusion-depression" between the said second part (9) of the block and the first part (8) of the block having a configuration essentially identical, but in the opposite direction in relation to these two next to each other to join the protrusion-depression".

16. Shi is and according to claim 1, in which the first slit drainage groove (10) restraint type extends in the specified unit (6A, 6b) from the specified first set in a direction essentially perpendicular to the tread surface.



 

Same patents:

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

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

Automotive tire // 2521033

FIELD: transport.

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

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

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

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

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

FIELD: road vehicles.

SUBSTANCE: pneumatic tire tread cap has grooves limiting raised repetitive patterns, at least one of which is provided with first cuts and second cuts, each cut being limited by two main side surfaces interconnected by end surface. Bottom surfaces of first cuts and top surfaces of second cuts are functionally intercoupled so that, at any degree of wear of pneumatic tire tread, length of edges on rolling surface is at least 75% of length of said edges in new tire tread cap.

EFFECT: improved adhesion of tread and road at any wear, reduced noise in running.

11 cl, 12 dwg, 1 tbl

FIELD: automotive industry; tire industry; road vehicles.

SUBSTANCE: proposed pneumatic tire tread cap is provided with great number of cuts, mainly, cross-orientated. According to invention, some of cross cuts at no wear form on tread running surface zones in form of cavities with mean width exceeding or equal to 2 mm, and maximum depth Pt not exceeding 80% of thickness of tread cap subject to wear. Other cross cuts form on the same tread running surface notches of width less than 2 mm and depth not exceeding Pt. great number of notches continue in zones in form of cavities so that after uniform wear of tread cap, volume of zones in form of cavities, opening on new tread running surface is of value within 50% and 150% of volume formed by zones at no wear. Forming member contains thick and thin parts.

EFFECT: improved wheel tread-to-road adhesion during entire service life of pneumatic tire.

6 cl, 8 dwg

FIELD: tire industry.

SUBSTANCE: proposed tire tread has three ring grooves and great number of cross grooves limiting four rows of blocks arranged along circumference, namely, two axial external shoulder rows and two central rows along sides of equatorial plane. Cross grooves meet in equatorial plane in preset direction of tire rolling. Each cross groove of tread central rows has widening of cross section of mainly circular profile formed at equal distance from ends and designed for gripping of snow. To provide low noise level when running along dry road, front cross edge profiles of adjacent blocks of central rows contains at least two series curvilinear sections.

EFFECT: improved gripping on snow-covered road, provision of noiseless running along dry roads and increased wear resistance of tread blocks.

33 cl, 7 dwg

Tread of tire // 2288846

FIELD: tire industry; heavy-weight truck tires.

SUBSTANCE: proposed tire tread with relief pattern is formed by two circumferential grooves. Said grooves are limited by two ribs of mean width containing great number of cuts whose contours on contact surface, when non-worn-out, are arranged between two points of intersection A and B, AB segment forming angle α not exceeding 40° in cross direction of tread. Each cut 7 of mean width E contains sequence of sections of cut. Some of said sections of cut over entire surface parallel to contact surface in non-worn-out state and enclosed between surface in non-worn-out state and 2/3 of maximum depth of cut have contours forming mean angle β not exceeding 15° in longitudinal direction of tread.

EFFECT: increased tire life.

8 cl, 7 dwg

FIELD: road transport; heavy radial-ply tires.

SUBSTANCE: proposed tire has tread with number of circular grooves and number of cross grooves forming solid section circular rows in tread. Each solid section is provided with slots in front part of running surface.

EFFECT: increased wear resistance of tire.

4 cl, 3 dwg

Pneumatic tire // 2333842

FIELD: transport.

SUBSTANCE: invention relates to automotive tires. The tread body is furnished with a dropper running axially in a zigzag manner and deep into the tire, the said dropper having an invariable depth. It features the rigidity index F defined as shown below, varying in the dropper lengthwise direction. The rigidity index makes F=(1+φ1)x(1+φ2)x(1+φ3), where φ1 is the dropper amplitude (mm) on the tire body step; φ2 is the dropper amplitude (mm) across the body section perpendicular to the dropper line on the step surface; φ3 is the dropper ridge line amplitude, the ridge running deep down, if the dropper wall surface seen from above. More particularly, the dropper amplitude φ1 on the tire outside exceeds, in axial direction, the dropper amplitude φ1' on the tire equatorial plane, and the dropper amplitude φ2 on the tire outside exceeds, in axial direction, the dropper amplitude φ2' on the tire equatorial plane. Thus, an irregular tire tread wear property is combined with adequate operating properties on moistened and snow-covered road surfaces.

EFFECT: reliable steering on moistened and snow-covered road surfaces.

9 cl, 22 dwg, 2 tbl

FIELD: transport.

SUBSTANCE: tyre for vehicle wheel contains tread band having tread pattern formed by at least two annular parts located in axial direction placed near each other. At least annular part have first geometric module repeated many times along direction of annular tyre length. First geometric module contains at least two shoulder blocks levelled-off in annular direction along side edge of tread band and separated by grooves positioned across annular outstretch direction of tyre and elongated ridge limited by two grooves inclined against annular outstretch direction. Elongated ridge is separated into many interim blocks with regard to axial outstretch of tread band separated by number of slots made essentially across elongated ridge.

EFFECT: tyre performance characteristics are improved.

58 cl, 7 dwg, 2 tbl

FIELD: automobile production.

SUBSTANCE: invention pertains to vehicle tyre protectors. Tyre tread for pneumatic tyre contains raised pattern that consists of many raised elements in a form of blocks and/or salient angles, limited by grooves. Many of raised elements are equipped with at least one notch oriented along some average direction. The direction is defined as angle between right line passing through the ends of this notch at running surface and transverse direction of tyre tread. Each notch is limited by walls made of rubber mixture and contains at least two areas, average orientation of which, measured in relation to transverse direction, differs from average orientation of this notch. At any rate, some of the said areas with orientation that differs from average direction of this notch have at least one projection that locally decreases the width of this notch by 50% of its maximum width.

EFFECT: improvement of tyre tread traction.

9 cl, 6 dwg

FIELD: transportation.

SUBSTANCE: invention is related to motor industry. Pneumatic tyre comprises multiple blocks on its tread, which are defined with grooves installed along periphery of tyre, substantially, in its circumferential direction, and multiple cross grooves that cross grooves arranged in circumferential direction. All grooves are formed on surface of tyre tread. At that slot-like grooves are arranged on tyre tread, every of which has at least one pair of inclines surfaces, installed in direction of depth of this groove inside block, separating every such block on its front side, and pair bulges installed on opposite walls of such slot-like groove. Every pair of specified bulges has total height equal to width of slot-like groove, and specified bulges are formed on at least one specified pair of inclined surfaces of slot-like groove, besides bulges are arranged one opposite the other. Method for tyre manufacture is realised with the help of vulcanisation die mould, in which multiple special knives are installed, being designed to form according slot-like grooves in tyre tread.

EFFECT: tyre adhesion properties improve.

6 cl, 27 dwg

Air tire // 2381109

FIELD: automotive industry.

SUBSTANCE: proposed air tire comprises blocks arranged on its tread and separated by multiple peripheral lengthwise grooves 3 and multiple crosswise grooves 5. Said blocks have slot-like drain grooves arranged along tire circumference. Inner peripheral slot-like drain grooves run straight along tire radial direction, while outer peripheral slot-like drain grooves represent radial zigzag patterns.

EFFECT: improved controllability irrespective of road carpet.

9 cl, 7 dwg

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