KR100390245B1 - Tire having a non-symmetry type tread pattern - Google Patents

Abstract

The present invention relates to a tire having an asymmetric tread pattern, wherein a pair of main longitudinal grooves 21a and 21b are formed in the middle portion of the tread width A so as to face each other along the circumferential direction of the tire. The main block is disposed between the main blocks 11 are divided into a plurality of main blocks 11 forming a circular shape, so that the main blocks 11 are arranged at predetermined intervals along the tire circumferential direction, and the main blocks 11 Both main longitudinal grooves 21a and 21b communicate with each other via the boundary grooves 22 therebetween, so that the wet handling performance of the tire is improved and hydroplaning is greatly suppressed.

Description

Tire having a non-symmetry type tread pattern

The present invention relates to a tire having an asymmetric tread pattern. In particular, in a tire having an asymmetric tread pattern in which a main longitudinal groove of a wave is formed on both sides of the main block, the main block is divided into a plurality of blocks forming a circle. The present invention relates to a tire having an asymmetrical tread pattern that greatly suppresses hydroplaning during wet road driving and greatly improves wet handling performance.

As is well known, with respect to the circumferential center of the tread pattern, the outer part is important for handling performance on dry road surface, and the inner part is important for wet performance on wet road surface. The higher the grounding ratio, the better the handling performance, while the lower the lower the grounding ratio, the more hydroplaning is suppressed. In recent years, the tread patterns of the outer and inner sections are based on the center of the tire circumferential direction. Tires of asymmetrical tread patterns that are formed differently have been proposed and are already widely used.

In particular, in the case of a tire having an asymmetrical tread pattern in which water between the road surface and the tread is guided to the main longitudinal groove of the waveform and then discharged into and out of the tread through separate grooves connected to the main longitudinal groove, Since the adjacent blocks are formed in a waveform, the frictional force between these blocks and the road surface is increased, and the braking performance is improved.

However, in the conventional asymmetrical tread pattern tire in which the corrugated main longitudinal groove is formed, the main block disposed between the pair of main longitudinal grooves is integrally formed along the tire circumferential direction, so that the wet performance is improved by the integral main block during corner driving. There was a problem of deterioration.

In addition, since the grooves forming the tread pattern are blocked inward and outward by the main block, the formation of the tread pattern for improving the drainage function is restricted, and there is a difficulty in preventing hydroplaning from occurring during wet road driving.

The present invention has been invented to solve the above problems, the main block is divided into a number of blocks forming a circular shape, the wet handling performance of the tire is greatly improved, hydroplaning during wet road running is suppressed as much as possible The object is to provide a tire with an asymmetric tread pattern.

1 is a view showing a portion of a tire having an asymmetric tread pattern according to the present invention.

-Explanation of terms for the main parts of the accompanying drawings-

11; Main block, 11a; Auxiliary Groove,

12; Outer first block, 12a; Auxiliary Groove,

13; Outer second block, 13a; Auxiliary Groove,

14; Inner first block 14a; Auxiliary Groove,

15; Inner second block 15a; Auxiliary Groove,

16; Inner third block, 16a; Auxiliary Groove,

21a, 21b; Main bellows, 22; Home,

23; Outer first inclined groove, 24; Outer auxiliary bellows,

25; Outer second inclined groove, 26; Inner first inclined groove,

27; Inner second inclined groove, 28; Inner third inclined groove,

29; Reverse Slope,

A; Tread Width,

B; Separation distance from the center of the tread width A to the center of the main block 11,

C; Wave height of the main longitudinal grooves 21a and 21b,

D; Separation distance in the width direction from the center of the tread width A to the outer auxiliary longitudinal groove 24,

E; Separation distance in the width direction from the outer tread boundary line to the start position of the outer second block auxiliary groove 13a,

F; Separation distance in the width direction from the center of the main block 11 to the end position of the outer first block auxiliary groove 12a,

G; Separation distance in the width direction from the center of the tread width A to the start position of the inner first inclined groove 26,

H; Separation distance in the width direction from the inner tread boundary line to the starting position of the inner reverse slope groove 29,

I; Separation distance in the width direction from the center of the tread width A to the end position of the inner first block auxiliary groove 14a,

J; Separation distance in the width direction from the end position of the inner first block auxiliary groove 14a to the start position of the inner second inclined groove 27,

K; Separation distance in the width direction from the starting position of the inner second inclined groove 27 to the starting position of the inner third inclined groove 27,

L; Separation distance in the width direction from the inner tread boundary line to the start position of the inner second and third block auxiliary grooves 15a and 16a,

M; Separation distance in the width direction from the center of the main block 11 to the start position of the main block auxiliary groove 11a,

R1; Radius of curvature of the outer first inclined groove 23,

R2; Radius of curvature of the outer second inclined groove 25,

R3; Radius of curvature of the inner first bevel 26,

R4; Radius of curvature of the main block auxiliary groove 11a,

θ1; Inclination angle at the start position of the outer first inclined groove 23,

θ2; Inclination angle at the start position of the outer second inclined groove 25,

θ3; Inclination angle at the starting position of the inner first inclined groove 26,

θ4; Inclination angle of the inner reverse slope groove 29,

θ5; Inclination angle of the inner third inclined groove 28,

θ6; The inclination angle at the start position of the main block auxiliary groove 11a.

A pair of main longitudinal grooves are formed in the middle portion of the tread width so as to face the tire circumferential direction, and a main block is disposed therebetween, and the main block is divided into a plurality of main blocks forming a circle, and thus these main blocks In a tire having asymmetrical tread patterns disposed at predetermined intervals along a tire circumferential direction and in which both main longitudinal grooves communicate with each other through boundary grooves between main blocks, the pitch of the tire is a first pitch and a second pitch. And a third pitch, the first pitch is larger than the second pitch, the second pitch is larger than the third pitch, the first pitch is in the range of 28 to 36 mm, the second pitch is in the range of 22 to 31 mm The third pitch satisfies the range of 18 to 28 mm, and the tread width satisfies the range of 0.75 to 0.85 times the entire tire width, but the separation distance in the width direction from the center of the tread width to the center of the main block is Tra The width of 0.03 ~ 0.05 times the width, the diameter of the main block satisfies the range of 0.06 ~ 0.10 times the width of the tread, and the width of the main longitudinal grooves ranges from 0.04 to 0.06 times the width of the tread, the depth of Tires with an asymmetric tread pattern, characterized in that the range of 7 to 9 mm, its corrugation height is within 0.3 times the width of the main longitudinal groove, and the depth of the boundary groove is within the range of 3 to 6 mm. Preferably, the present invention is a pair of auxiliary grooves are formed in the main block facing the main block, the separation distance in the width direction from the center of the main block to the start position of the main block auxiliary groove is the main It satisfies the range of 0.5 to 0.8 times the diameter of the block, the inclination angle at the starting position of the main block auxiliary groove is within the range of 70 to 90 °, and the radius of curvature of the main block auxiliary groove is within the range of 10 to 25 mm. , Its width ranges from 0.6 to 1.0 Above, its depth is in the range of 4-8 mm.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a part of a tire having an asymmetric tread pattern according to the present invention, according to the present invention, a pair of main longitudinal grooves 21a along the circumferential direction of the tire in the middle portion of the tread width (A) 21b are formed to face each other, and a plurality of main blocks 11 forming a circle between them 21a and 21b are disposed at predetermined intervals along the tire circumferential direction, and boundary grooves between the main blocks 11 Both main longitudinal grooves 21a and 21b communicate with each other via 22).

In this case, even when driving on a wet road surface, the water guided to the left and right main longitudinal grooves 21a and 21b freely flows through the boundary grooves 22 between the main blocks 11, so that the drainage function is improved and hydroplaning is greatly increased. Suppressed.

In addition, since the main blocks 11 are formed in a circular block independent from each other along the tire circumferential direction, the wet handling function is greatly improved when cornering.

1 illustrates an embodiment of the present invention, wherein a pitch of a tire is divided into a first pitch, a second pitch, and a third pitch, wherein the first pitch is greater than the second pitch, and the second pitch is greater than the third pitch. The first pitch satisfies the range of 28 to 36 mm, the second pitch satisfies the range of 22 to 31 mm, and the third pitch satisfies the range of 18 to 28 mm. An example is applied to a tire having an asymmetric tread pattern satisfying the range of 0.75 to 0.85 times.

In this case, the separation distance B in the width direction from the center of the tread width A to the center of the main block 11 satisfies the range of 0.03 to 0.05 times the tread width A, and the main block 11 ) Diameter satisfies the range of 0.06 ~ 0.10 times, and the width of the main longitudinal grooves (21a, 21b) is in the range of 0.04 ~ 0.06 times the tread width (A), its depth is in the range of 7 ~ 9 mm, The waveform height C thereof satisfies the range within 0.3 times the width of the main longitudinal grooves 21a and 21b, and the depth of the boundary groove 22 satisfies the range of 3 to 6 mm.

In addition, as shown in FIG. 1, when the pair of auxiliary grooves 11a are formed in the main block 11 so as to face each other, the drainage function is further improved while maintaining the rigidity of the main block 11 uniformly. In the case of the embodiment, the separation distance M in the width direction from the center of the main block 11 to the start position of the main block auxiliary groove 11a is in the range of 0.5 to 0.8 times the diameter of the main block 11. The inclination angle θ6 at the start position of the main block auxiliary groove 11a satisfies the range of 70 to 90 °, and the radius of curvature R4 of the main block auxiliary groove 11a is in the range of 10 to 25 mm. It is preferable that its width satisfies the range of 0.6 to 1.0, and its depth satisfies the range of 4 to 8 mm.

Meanwhile, as shown in FIG. 1, when the inner and outer tread patterns of the main longitudinal grooves 21a and 21b are formed, the difference in the grounding ratio between the inside of the tread and the outside of the tread is minimized, so that uneven wear of the tread is suppressed. It explains in more detail.

First, the outer tread pattern includes an outer auxiliary longitudinal groove 24 disposed in parallel with the corrugated main longitudinal grooves 21a and 21b, and is disposed at predetermined intervals along the tire circumferential direction, and thus the outer main longitudinal groove 21a and the outer auxiliary longitudinal groove 24. ) And an outer first inclined groove 23 which communicates with each other, and an outer agent which is disposed at a predetermined interval along the tire circumferential direction and extends outward from the outer auxiliary longitudinal groove 24 while intersecting with the outer first inclined groove 23. The second inclined groove 25 is formed, but the outer first and second inclined grooves 23 and 25 are formed to be inclined in the vehicle traveling direction with respect to the center of the main block 11. The width of the outer auxiliary longitudinal groove 24 satisfies the range of 0.025 to 0.04 times the tread width A, the depth thereof is in the range of 7 to 8.5 mm, and the outer auxiliary longitudinal groove 24 from the center of the tread width A. The separation distance D in the width direction up to) satisfies the range of 0.28 to 0.38 times the tread width A. The depth of the outer first inclined groove 23 satisfies the range of 5 to 8.5mm, the width thereof is to be gradually increased from the start position to the end position (from the inner side to the outer side), the minimum width thereof is 3 In the range of ˜5 mm, its maximum width satisfies the range of 5 to 7 mm, the inclination angle θ1 at its starting position ranges from 70 to 90 °, and its radius of curvature R1 is 80 to 150 mm. It satisfies the range, and its starting position is a point where the horizontal line in the tire width direction passing through the center of the main block 11 and the outer line of the outer corrugated main longitudinal groove 21a cross each other. The width of the outer second inclined groove 25 satisfies the range of 3 to 8 mm, its radius of curvature R2 is in the range of 400 to 500 mm, the inclination angle θ2 at its starting position is 70 to 90 It satisfies the range of °, its starting position is the point where the horizontal line in the tire width direction passing through the center of the main block 11 and the outer line of the auxiliary longitudinal groove 24 cross each other. On the other hand, as shown in Fig. 1, the outer first · is formed by the outer main longitudinal groove (21a) and the outer first inclined groove 23, the outer auxiliary longitudinal groove 24 and the outer second inclined groove (25). When the auxiliary grooves 12a and 13a are formed in the two blocks 12 and 13, the stiffness of the first and second blocks 12 and 13 is kept uniform, and the drainage function is improved. The outer first block auxiliary groove 12a is parallel to the outer first inclined groove 23 from the outer line of the outer corrugated main longitudinal groove 21a and crosses the thickness center of the outer first block 12. The separation distance F in the width direction from the center of the center to the end position of the outer first block auxiliary groove 12a satisfies the range of 0.2 to 0.25 times the tread width A, and the outer first block The depth of the auxiliary groove (12a) is in the range of 4 ~ 8mm, its width satisfies the range of 0.6 ~ 1.0, its radius of curvature is the same as the radius of curvature (R1) of the outer first inclined groove (23). The outer second block auxiliary groove 13a crosses the thickness center of the outer second block 13 while being parallel to the outer second inclined groove 25, and the depth thereof is in the range of 2 to 6 mm, and the width thereof. Is within the range of 1 to 3 mm, its radius of curvature is the same as the radius of curvature R2 of the outer second inclined groove 25, from the outer tread boundary line to the start position of the outer second block auxiliary groove 13a The separation distance (E) of satisfies the range of 0.5 to 0.8 times the tread width (A).

In addition, the inner tread pattern may be formed to be inclined in a direction opposite to the vehicle traveling direction with respect to the center of the main block 11 and disposed at predetermined intervals along the tire circumferential direction, and the main block ( 11, the inner third inclined groove 28 and the main which are inclined in the vehicle traveling direction with a center of the tire circumferential direction and arranged in a predetermined interval along the tire circumferential direction to communicate with the inner first inclined grooves 26 facing each other; The inner second inclined groove 27 formed between the inner first inclined grooves 26 facing each other is formed to be inclined in the opposite direction to the vehicle traveling direction with respect to the center of the block 11. The depth of the inner first inclined groove 26 is in the range of 6 to 8.5mm, its width is in the range of 4 to 8mm, its radius of curvature R3 is in the range of 600 to 1000mm, at its starting position Inclination angle θ3 satisfies the range of 25 to 45 °, and the separation distance G in the width direction from the center of the tread width A to the start position of the inner first inclined groove 26 is the tread width ( The range of 0.08 to 0.13 times of A) is satisfied. The depth of the inner second inclined groove 27 is in the range of 4 to 8 mm, the width thereof is in the range of 2 to 6 mm, the radius of curvature thereof is the same as the radius of curvature of the inner first inclined groove 26. Since the separation distance (I + J) in the width direction from the center of the tread width A to the start position of the inner second inclined groove 27 satisfies the range of 0.17 to 0.25 times the tread width A. , The inner second inclined groove 27 crosses the thickness center of a portion of the inner first block 14 formed by the inner first inclined groove 26 and the inner third inclined groove 28, and the inner third inclined groove 27. The block disposed inside the tire based on the inclined groove 28 is divided into an inner second block 15 and an inner third block 16. The depth of the inner third inclined groove 28 is in the range of 4 ~ 8mm, its width is in the range of 3 ~ 6mm, the inclination angle (θ5) at its starting position satisfies the range of 10 ~ 30 ° The radius of curvature thereof is infinity (= straight line), and the separation distance K in the width direction from the starting position of the inner second inclined groove 27 to the starting position of the inner third inclined groove 27 is defined as a tread width ( The range of 0.05 to 0.08 times of A) is satisfied. Meanwhile, as shown in FIG. 1, the inner tread boundary lines of the inner first and second inclined grooves 26 and 27 are bent correspondingly to each other in the reverse direction (vehicle traveling direction) to thereby form the inner reverse slope groove 29. When formed, the handling performance is improved while maintaining the drainage performance satisfactorily. The inner reverse slope groove 29 has a width in the range of 3 to 6 mm, its inclination angle θ4 at its starting position satisfies a range of 70 to 90 degrees, and its radius of curvature is infinite (= straight line), The separation distance H in the width direction from the inner tread boundary line to the start position of the inner reverse slope groove 29 satisfies the range of 0.05 to 0.08 times the tread width A. In addition, as shown in FIG. 1, when the auxiliary grooves 14a, 15a, and 16a are formed in the inner first, second, and third blocks 14, 15, and 16, the rigidity of these blocks 14, 15, and 16 is increased. It maintains uniformity and improves drainage function. The inner first block auxiliary groove 14a is an inner first inclined groove 26 from a point where a horizontal line in the tire width direction passing through the center of the main block 11 and an outer line of the inner corrugated main longitudinal groove 21b cross each other. While crossing the thickness center of the inner first block 14 while being parallel to, the distance I in the width direction from the center of the tread width A to the end position of the inner first block auxiliary groove 14a is It satisfies the range of 0.13 to 0.18 times the tread width A, the depth of the inner first block auxiliary groove 14a is in the range of 4 to 8 mm, the width thereof is in the range of 0.6 to 1.0 mm, The radius of curvature is the same as the radius of curvature R3 of the inner first inclined groove 26. The inner second and third block auxiliary grooves 15a and 16a are parallel to the inner reverse slope grooves 29 and traverse the thickness center of the inner second and third blocks 15 and 16, and the depth thereof is 2.0 to 5.0. In the range of mm, its width satisfies the range of 0.6 to 1.0 mm, and its radius of curvature is equal to the radius of curvature of the inclined groove 29 (= straight line), and the inner second and third blocks are supported from the inner tread boundary. The separation distance L in the width direction to the start positions of the grooves 15a and 16a satisfies the range of 0.03 to 0.06 times the tread width A.

On the other hand, the portions where the grooves forming the tread pattern are interconnected are appropriately rounded so that the edge portions of the blocks bounded by the grooves are not damaged as much as possible. In addition, the shoulder portion of the inner reverse slope groove 29 (inner portion than the inner boundary of the tread) and the shoulder portion of the corresponding second and third block auxiliary grooves 15a and 16a may be reversely inclined again. The handling performance of the inner tread pattern is improved.

When the inner and outer tread patterns are formed as shown in FIG. 1, the difference in the grounding ratio between the inside of the tread and the outside of the tread can be minimized, thereby suppressing the occurrence of hydroplaning and uneven wear of the tread as much as possible.

According to the present invention as described above, the main block is divided into a plurality of blocks forming a circle, the wet handling performance of the tire is improved, there is an effect that the hydroplaning during wet road running is greatly suppressed.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the following claims.

Claims (3)

A pair of main longitudinal grooves 21a and 21b are formed in the middle portion of the tread width A so as to face each other along the tire circumferential direction, and the main blocks are disposed between the main blocks 21a and 21b. The main blocks 11 are divided into a plurality of main blocks 11, and these main blocks 11 are arranged at predetermined intervals along the tire circumferential direction, and both main longitudinal grooves are formed through the boundary grooves 22 between the main blocks 11. In a tire having an asymmetrical tread pattern in which 21a and 21b are in communication, As the pitch of the tire is divided into a first pitch, a second pitch, and a third pitch, the first pitch is larger than the second pitch, the second pitch is larger than the third pitch, and the first pitch is in the range of 28 to 36 mm. The second pitch satisfies the range of 22 to 31 mm, the third pitch satisfies the range of 18 to 28 mm, and the tread width A satisfies the range of 0.75 to 0.85 times the entire tire width, The separation distance B in the width direction from the center of (A) to the center of the main block 11 satisfies the range of 0.03 to 0.05 times the tread width A, and the diameter of the main block 11 is tread. It satisfies the range of 0.06 to 0.10 times the width A, and the width of the main longitudinal grooves 21a and 21b is in the range of 0.04 to 0.06 times the tread width A, and the depth thereof is in the range of 7 to 9 mm. , The waveform height (C) thereof satisfies the range within 0.3 times the width of the main longitudinal grooves (21a, 21b), the depth of the boundary grooves 22 satisfy the range of 3 ~ 6mm Tread Pattern With tires. (delete) The method of claim 1, A pair of auxiliary grooves 11a are formed in the main block 11 so as to face each other, and the separation distance M in the width direction from the center of the main block 11 to the start position of the main block auxiliary grooves 11a. Satisfies the range of 0.5 to 0.8 times the diameter of the main block 11, the inclination angle θ6 at the start position of the main block auxiliary groove 11a satisfies the range of 70 to 90 degrees, the main block auxiliary groove The radius of curvature R4 of (11a) is in the range of 10 to 25 mm, its width is in the range of 0.6 to 1.0, and its depth is in the range of 4 to 8 mm. tire.