Pneumatic tire

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

 

The invention relates to a pneumatic tire provided with a tread pattern including units formed from the longitudinal grooves and transverse grooves, in particular to a pneumatic tire to reduce the level of noise from the tread.

In the bus with a picture of the blocks with blocks on the tread surface, where the longitudinal grooves are 'in the longitudinal direction of the tire and lateral grooves are perpendicular to the longitudinal direction, there is a problem, consisting in the fact that the edge of the block with the first side of the ground contact Bob on the road surface during contact with the ground and produces a shock noise. And vibration during the shot causes agitation of the air in the longitudinal groove and creates a cavity resonance.

To solve this problem in the blocks use soft rubber to soften the blow in the moment when the edge of the block in contact with the road surface to reduce impact noise. Unfortunately, if the rubber block is too soft, the blocks strongly deformed during contact with the ground and contraction and the opening of the transverse grooves produces loud noise of the air suction. As a result, this may cause more noise from the tread, and there is a possibility of formation of uneven wear. Here the noise from the tread determined by the t as every noise, coming from a tread pattern including, for example, the above shock noise, cavity resonance, the noise of the air suction, etc. Thus, it is difficult to largely reduce the noise from the tread, because mitigation rubber limited.

In this regard, with the objective of reducing the impact of noise in the published patent application of Japan No. 2000-309207 proposed bus comprising a block (a), equipped with a large number of concave-convex non-planar parts (b) on the radially outer edge (AE), where the combined surface (as) addressed to the transverse groove, and the surface (ts) of the tread. In accordance with the published patent application of Japan No. 2000-309207 above the non-planar part (b) made in the form of holes and notches. Unfortunately, despite the fact that achieve the effect of reducing noise, in a block do not expect to achieve the effect of reducing cavity resonance in the longitudinal grooves.

Thus, the aim of the present invention is to provide a pneumatic tire capable of eliminating the noise from the tread by reducing impact noise and cavity resonance at the noise of the air suction.

In accordance with the present invention a pneumatic tire includes a tread with blocks, and each specified block has a surface wall of the block, facing p is pepper the groove, inclined at an angle (Θ) from 5 to 40 degrees relative to the axial direction of the tire with the formation of sharp edges and obtuse-angled edge of the block, where the surface of the block between the acute-angled edge and the obtuse-angled edge provided with at least two slits with a width of 0.3 to 2.0 mm so that the distance P2, measured from the acute-angled edge to one of the at least two slots closest to the acute-angled edge, is greater than the distance D1, measured from the specified obtuse-angled edge to one of the at least two slots closest to the obtuse-angled edge; each distance is measured along the radial outside edge of the wall surface of the block to the center of the slot width.

The blocks can be arranged in longitudinal rows separated by longitudinal grooves and longitudinal rows may include a Central number, located on the equator of the tire.

Preferably, each of at least two slots has a longitudinal length L of 2.0 to 6.0 mm

Preferably, at least two slots located at the distance R from 0.1 to 0.4 of the length W of the specified radial outside edge of the wall surface of the block where the distance R is measured along a specified radial outer edge, between the centers of the width of the adjacent slots, and the length W is measured along a specified radial outer edges.

The distance is preferably not less than a specified distance P1 on the side of the obtuse-angled edge, but less than the specified distance P2 on the side of the acute-angled edge.

Thus, in the present invention the transverse grooves inclined at a relatively large angle (5 to 40 degrees) relative to the axial direction of the tire. This allows the gradual entry of the block in contact from sharp edges and soften the blow. Also, on the surface of the wall block is provided with at least two slots facing in the transverse grooves, and therefore the rigidity of the edges of the block can be moderately reduced. In combination with mitigation impact, due to the above tilt lug grooves provide suppressing the shock noise.

Meanwhile, when using a softer rubber blocks, the block is deformed during contact with the soil and the amount of transverse grooves is changed. This can lead to increased noise air suction. However, the slot in accordance with the present invention operates as a channel for exhaust air and the compressed air in the transverse grooves can be issued that suppresses noise of the air suction.

Due to the inclination of the transverse grooves blocks undesirable equipped with the acute-angled and obtuse-angled edges. However, the distance P2, measured from the acute-angled edge to one of the at least two about what the iesi, located close to the sharp edge, is greater than the distance D1, measured from the obtuse-angled edge to one of the at least two slots located closer to the obtuse-angled edge. Thus, moving the acute-angled edges with low stiffness or vibration of the acute-angled edges can be suppressed at the time of impact, which suppresses the occurrence of cavity resonance in the longitudinal grooves.

Because the block is in contact with the ground by the acute-angled edge, the air pressure in the transverse groove above from the side of the obtuse-angled edge.

In the present invention the ratio of the distance between P1 and P2 is:

P1<P2.

Cut from the side of the obtuse angle formed close to the obtuse-angled edge. Obtuse-angled edge is experiencing high air pressure, so that the compressed air in the transverse grooves can be effectively released. Moreover, the rigidity of the obtuse-angled edge is reduced and decreases the energy, so that uneven wear can be suppressed in the area of the obtuse-angled edge.

Brief description of drawings

In Fig.1 shows the expanded view of the tread pattern of the pneumatic tire in accordance with the invention;

In Fig.2 presents an enlarged view of the block from above;

In Fig.3 presents a view of the cross-section of the block of Fig.2;

In Fig.4(a), 4(B) 4(C) and 4(D) presents the types of Blo is a top, showing another embodiment, and

In Fig.5 presents a perspective view of the block according to the example of the prior art.

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

In Fig.1 shows the expanded view of the tread of the heavy duty radial tire in accordance with the invention. As shown in Fig.1, a pneumatic tire 1 shows the embodiment provided on the surface 2 of the protector of the longitudinal grooves 3, passing in the longitudinal direction of the tire and lateral grooves 4, passing in a direction perpendicular relative to the longitudinal grooves 3, with the formation of blocks 6 on the surface 2 of the protector.

Longitudinal grooves 3 in the present embodiment include the axially inner longitudinal grooves 3i, located on both sides of the equator With the tires, and the axially outer longitudinal grooves 3s located axially outside the axially inner longitudinal grooves 3i.

Transverse grooves 4 in the present embodiment includes an axial inner transverse grooves 4i, located between the axially inner longitudinal grooves 3i, the axially intermediate transverse grooves 4m, located between each of the axially inner longitudinal groove 3i and each axially outer longitudinal groove 3s, and Sealine-external transverse grooves 4s, located between each of the axially outer longitudinal groove 3s and each edge of The tread.

Therefore, the surface 2A of the tread comprises a tread formed from a number of Central units 6C, surrounded by longitudinal grooves 3i and transverse grooves 4i, rows of axially-intermediate units 6m, surrounded by longitudinal grooves 3i and 3s and transverse grooves 4m, and rows of axially-outer blocks 6s, surrounded by longitudinal grooves 3s, the edges of The tread and lateral grooves 4s.

Obviously, in the pneumatic tire 1 can be made various changes and it is not limited by the figure of the blocks. At least one of the rows of blocks 6 can be replaced and received, for example, on the pattern of blocks and edges passing continuously in the longitudinal direction of the tire. The width and depth of the aforementioned longitudinal grooves 3 and transverse grooves 4 are also not specifically limited and can be chosen arbitrarily width and depth of the grooves, as in a traditional pneumatic tire.

Each of these transverse grooves 4 is inclined at an angle (Θ) from 5 to 40 degrees relative to the axial direction of the tire. As shown in Fig.2, the transverse grooves 4 formed in the form of inclined grooves. Thus, each of the above components equipped with 6 edges 7 blocks on crossed and above the transverse grooves 4 and the longitudinal grooves 3. Region 7 blocks include acute-angled edges 7a, where the angle (α) of the edge has the shape of an acute angle and obtuse-angled edges 7b, where the angle (α) of the edge has the shape of an obtuse angle between the transverse groove 4 and the longitudinal groove 3.

Moreover, the above blocks 6 have a surface SA of the wall of the block, facing to the above-mentioned transverse groove 4, at least two slits 9 (three slots 9 in the present embodiment), passing in the longitudinal direction.

Each of the slots 9 is a narrow groove width Ws from 0.3 to 2.0 mm, One end of the slot 9 extends to the surface SA of the wall block and the other end ends within the block 6. The longitudinal length L of the slot 9 is preferably from 2.0 to 6.0 mm, and the depth (h) of the slot 9, measured from the tread surface 2, is preferably from 0.3 to 1.0, the Well depth of the transverse grooves 4 facing the slits 9 (shown in Fig.3). Adjacent the slits 9 are from each other the same distance in the present embodiment. Each distance R, measured between the centers of the width of the adjacent slots 9, is from 0.1 to 0.4 of length W radially outer edges 6E. And radially-outer edge 6E defined as the edge where it joins the surface SA of the wall of the block and the surface 2 of the protector.

In the above block of 6 one of the slots 9, closest to the acute-angled edge 7a, denoted as PR the pain 9a, and one of the slots 9 nearest the obtuse-angled edge 7b, designated as the slot 9b. In this example, the distance P2, measured from the acute-angled edge 7a to the slot 9a, the nearest to the acute-angled edge 7a, is greater than the distance D1, measured from the specified obtuse angle 7b to the slot 9b, the nearest to the obtuse-angled edge 7b, and each distance is measured along the radially outer edges 6E wall surface of the block to the center of the width of the slot.

In the tire 1 with the same tread pattern above the transverse grooves 4 is inclined at an angle (Θ) from 5 to 40 degrees relative to the axial direction of the tire, and the block 6 can come into contact with the surface of the ground gradually, from the acute-angled edges 7a, which lessens the impetus for the strike. Moreover, on the surface SA of the walls of the block are at least two slots 9, facing the transverse grooves 4. These slits 9 are feasible to reduce the rigidity of the edge of the block with the first side of the contact area with the ground. In combination with mitigation impact, due to the slope above the transverse grooves 4, the slits can suppress the shock noise. In particular, if the above angle (Θ) is less than 5 degrees, and if there is one slot 9, the effect of mitigating the shock at impact is insufficient. However, if the angle (Θ) exceeds 40 degrees, the characteristic of the clutch with wet the m road surface and adhesive force, which characteristics provided with transverse grooves, not improve. Therefore, the angle (Θ) is preferably not less than 25 degrees.

Above the slot 9 serves as a channel to exhaust air inside the transverse grooves 4. During contact with the ground slot 9 contribute to the discharge of the air compressed due to the deformation of the transverse grooves 4, and reduce the noise of air suction.

If the width Ws of the slot 9 is more than 2.0 mm, the amount of transverse grooves 4, which includes the slots 9 becomes larger, which may not be desirable to increase the noise of the air suction. If the above width Ws is less than 0.3 mm, the knife blade to generate cuts will be too thin to form the slot itself. Thus, the lower limit of the width Ws is preferably not less than 0.6 mm, and the upper limit is not more than 1.5 mm, more preferably not more than 1.0 mm

If the length L of the slot 9 is less than 2.0 mm, the mitigation of shock at impact is not very effective, and the slits 9 may not sufficiently suppress the shock noise. However, if the length L exceeds 6.0 mm, the balance of rigidity of the block becomes worse and this can cause uneven wear. Thus, the lower limit of the length L is preferably not less than 3.0 mm, and the upper limit is preferably SOS is to place not more than 5.0 mm

If the depth (h) of the slot 9 is less than 0.3, the Well depth of the transverse grooves, mitigation of shock at impact will not be very effective, and the slot 9 is worn at the initial stage of wear, thereby reducing the previously obtained effect. However, if the depth (h) of the slot 9 exceeds 1.0 Well depth of the transverse grooves, the balance of rigidity of the block becomes worse, thereby causing uneven wear. Therefore, the lower limit of the depth (h) of the slot is preferably not less than 0.5 of the Well depth of the transverse grooves. And so that when the operation is not wore out only some of the slots 9, all the slots 9 preferably have equivalent widths Ws, length L and depth (h).

If the distance P between the grooves 9 is less than 0.1 of the length W of the radially-outer edge 6E balance of rigidity of the block becomes worse and you may experience uneven wear. However, if the distance R exceeds 0.4 length W, the mitigation of shock at impact is not very efficient, which is not enough suppressing the shock noise. Therefore, the lower limit of the distance R is preferably at least 0.15, more preferably not less than 2.0 length W And the upper limit is preferably not more than 0.3.

Moreover, in the present invention, with regard to the acute-angled edges 7a and obtuse-angled edge 7b formed are listed in the above transverse grooves 4, which are inclined, the distance P2 to the slot 9 is greater than the distance P1. Therefore, it can reduce the displacement of the acute-angled edge 7a of low rigidity or vibration of the acute-angled edge 7a during impact and all this enables suppression of excitation and the occurrence of cavity resonance in the longitudinal grooves 3. At the same time to maintain a good balance of rigidity of the blocks, the above distance P between the grooves 9 are preferably not less than the distance D1, but less than the distance P2; that is, preferably the ratio between the intervals is:

P1≤P<P2.

To balance the above-mentioned rigidity of the block, the ratio (α2·P2)/(α1·P1) preferably is 1.0 ą 0.2. Work (α2·P2) is the product of the above angle α2 of the acute-angled edges 7a and the above distance P2, and the product (α1·P1) is the product of the angle α1 is obtuse-angled edges 7b and the above distance P1.

In particular, in the present invention the above-mentioned longitudinal groove 3 formed in the form of straight grooves passing linearly in the longitudinal direction. But we should not assume that the longitudinal grooves 3 are limited to rectilinear grooves. As shown in Fig.4(a), 4(B) 4(C) and 4(D), the surface SB of the wall of the block, facing to the longitudinal groove , may include inclined part 10, tilted, for example, at an angle (β) relative to the longitudinal direction. In particular, if the above-mentioned inclined portion 10 extends from the acute-angled edges 7a and/or obtuse edges 7b, the above-mentioned angle (β) of the inclined portion 10 is smaller than the angle (Θ) of the transverse grooves 4. With this arrangement, the angle (α) of the acute-angled region 7a has a shape of an acute angle, and the angle (α) is obtuse-angled edge has the shape of an obtuse angle. Moreover, the surface of the SB wall block in a position located at a distance above the edge 7 of the block may be provided with cutouts.

The above-described specific preferred embodiments of the present invention, but obviously that can be made various changes, and the present invention is not limited to the embodiments presented in the drawings.

Comparative tests

Made of heavy-duty radial tires size 275/80R22,5 on the basis of the tread pattern shown in Fig.1, and the technical specifications presented in table 1, and tested them on the noise level in comparison with each other. Each tire had essentially the same design as shown below, with the exception of technical characteristics is presented in table 1:

Length W radially outer edge of each block: 35 mm;

The width of the longitudinal grooves: 9 mm;

the depth of the longitudinal grooves: 16 mm;

The width of the transverse grooves: 7 mm;

The Well depth of the transverse grooves: 16 mm

Trials tires on the noise level

One tire is rotated on the drum in accordance with bench tests defined in the standard JASOC606 in anechoic room under the following conditions:

Wheel rim: 7,50×22,5;

Internal pressure: 900 kPa;

Load: 23,7 kN;

Speed: 40 km/h

Sound level (O. A.) noise was measured using a microphone located at a distance of one meter from the center of the tire and at a height of 0.25 m, and determined the difference with the noise level of the comparative examples. The results of the tests are presented in table 1. A negative value (minus) means lower noise level.

The test results confirm that the tires according to the examples according to the invention allow, in General, to reduce the level of noise from the tread, suppressing the shock noise and cavity resonance, when the noise of the air suction.

Table 1
Cf.Ave.1Cf.Ave.2Cf.Ave.3Ave.1Ave.2Ave.3Ave.4Ave.5 Ave.6Ave.7Ave.8
The number of slots03333333333
Depth (h) of the slits [mm]-11,511,511,511,511,511,511,511,511,511,5
The ratio h/Well-0,720,720,720,720,720,720,720,720,720,72
The width Ws of the slot [mm]-3,03,0 2,01,51,00,60,31,01,01,0
The length L of the slits [mm]-6,06,06,06,06,06,06,06,06,06,0
The distance R between the slits [mm]-8,58,58,58,58,58,58,58,58,58,5
The ratio P/W-0,240,240,240,240,240,240,240,240,24 0,24
The angle (Θ) of inclination of the transverse grooves [C]303030303030303025155
The angle α1 is obtuse-angled edge12012012012012012012012011510595
The angle α2 of the acute-angled edge6060606060606060657585
The distance P1 [mm]-966666666
The distance P2 [mm]-9121212121212121212
Does the ratio P1≤P<P2nonoYesYesYesYesYesYesYesYesYes
Noise level [dB]STD.+0,4+0,2-0,2-0,3-0,4-0,4-0,5-0,4-0,3-0,2
Continuation of table 1
Ave.9Ave.10Ave.11Ave.12Ave.13Ave.14Ave.15Ave.16Ave.17Ave.18Ave.19
The number of slots22553333333
Depth (h) of the slits [mm]11,511,511,511,564,83,511,511,511,511,5
The ratio h/Well0,72 0,720,720,720,3750,300,220,720,720,720,72
The width Ws of the slot [mm]1,01,01,01,01,01,01,01,01,01,01,0
The length L of the slits [mm]6,06,06,06,06,06,06,02,03,05,07,0
The distance R between the slits [mm]1412,55,03,58,58,58,58,5 8,58,58,5
The ratio P/W0,40,360,140,10,240,240,240,240,240,240,24
The angle (Θ) of inclination of the transverse grooves [C]3030303030303030303030
The angle α1 is obtuse-angled edge120120120120120120120120120120120
The angle α2 of the acute-angled edge6060 606060606060606060
The distance P1 [mm]67,5576666666
The distance P2 [mm]1515101412121212121212
Does the ratio P1≤P<P2YesYesYesnoYesYesYesYesYesis and Yes
Noise level [dB]-0,3-0,3-0,5-0,5-0,4-0,4-0,3-0,3-0,3-0,5and-0.6

1. A pneumatic tire comprising a tread provided with blocks, each specified block has a wall surface of the block facing the transverse groove is inclined at an angle (Θ) from 5 to 40 degrees relative to the axial direction of the tire with the formation of sharp edges and obtuse-angled edge of the block, where the surface of the block between the acute-angled edge and the obtuse-angled edge provided with at least two slits with a width of 0.3 to 2.0 mm so that the distance P2, measured from the acute-angled edge to one of the at least two slots closest to the acute-angled edge, is greater than the distance P1, measured from the specified obtuse-angled edge to one of the at least two slots closest to the obtuse-angled edge; each distance measured along the radially outer edge of the wall surface of the block to the center of the slot width.

2. Pneumatic tyre under item 1, in which is specified the s blocks are arranged in longitudinal rows, separated by longitudinal grooves.

3. Pneumatic tyre under item 2, in which the mentioned longitudinal rows include a Central number, located on the equator of the tire.

4. Pneumatic tyre on p. 3, in which the transverse grooves of the Central row are inclined in one direction and the transverse grooves of the other series are tilted in the other direction different from the direction of the slope of the Central range.

5. Pneumatic tyre under item 2, in which the protector is provided on the equator of the tire rib, passing continuously in the longitudinal direction.

6. Pneumatic tyre under item 1, in which each of the said at least two slots has a longitudinal length L of 2.0 to 6.0 mm

7. Pneumatic tyre under item 1, in which indicated at least two slots located at the distance R from 0.1 to 0.4 of the length W of the specified radial outside edge of the wall surface of the block where the distance R is measured along a specified radial outer edge, between the centers of the width of the adjacent slots, and the length W is measured along a specified radial outer edges.

8. Pneumatic tyre under item 7, in which the distance R is not less than the specified distance P1 on the side of the obtuse-angled edge, and less than the specified distance P2 on the side of the acute-angled edge.

9. Pneumatic tyre under item 1, in which the specified angle (Θ) is not less than 25 degrees.

p> 10. Pneumatic tyre under item 1, in which indicated at least two slits are three slots.



 

Same patents:

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

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

Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

FIELD: transport.

SUBSTANCE: tread contains multiple grooved obstructing elements (4) which are formed by and located in circular grooves (2). Herewith, obstructing elements (4) go from bottom (21) of circular groove (2) and blocks at least 70% of cross-section area of circular groove (2). Bending parameter of grooved obstructing elements (4) is determined as E·I/(h3l), where E is module at 10% elongation of material used for grooved obstructing elements, I is inertia moment of grooved obstructing element cross-section, h is height of grooved obstructing element, and l is width of grooved obstructing element, and ranges from 250 Pa to 350 Pa.

EFFECT: providing grooved obstructing elements wear to degree equivalent to tread section wear degree while reducing noise caused by resonance of air columns and maintaining retraction characteristics.

6 cl, 6 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

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

Tire // 2533641

FIELD: transport.

SUBSTANCE: tread contains blocks. Block (100) includes a pair of extending sections (40) which protrude in direction of tire circumference, respectively from side surface (25A) and side surface (25B), and a pair of outwardly outstanding sections (60) which overhang outwards, respectively from this pair of extending sections (40) in direction of tire circumference. Extending section includes sharp angle (45) formed by intersecting sloping groove and ring groove. Extending section (40A) lays at the side of one edge in direction of tread width, and extending section (40B) lays at the side of the other edge in direction of tread width. Top surface relating to outwardly outstanding section (60) in radial tire direction is inclined relative to radial direction of tire.

EFFECT: better tire performance on snow.

4 cl, 7 dwg, 1 tbl

Up!