JP7099063B2 - tire - Google Patents

Description

The present invention relates to a tire, and more particularly to a tire suitable for high-speed running.

The following Patent Document 1 proposes tires used for both public road driving and circuit driving. In order to ensure wet performance on public roads, the tire has a first main groove arranged between the equator of the tire and the inner tread ground contact end, one end communicating with the first main groove and the other end outside. It has a second lateral groove that terminates at the tread portion.

Japanese Unexamined Patent Publication No. 2017-03604

However, the first main groove and the second lateral groove have a problem that water between the outer tread portion and the road surface cannot be sufficiently discharged during wet running. On the other hand, when the outer tread portion is provided with a main groove continuously extending in the tire circumferential direction, there is a problem that the pattern rigidity of the outer tread portion is lowered and the cornering performance on a dry road surface is deteriorated.

The present invention has been devised in view of the above problems, and an object of the present invention is to provide a tire capable of exhibiting excellent cornering performance while ensuring wet performance.

The present invention is a tire having a tread portion whose mounting direction on a vehicle is specified, and the tread portion has an outer tread grounding end that is outside the vehicle when mounted on the vehicle and an inner tread that is inside the vehicle when mounted on the vehicle. It has a ground contact end and an outer tread portion between the tire equatorial line and the outer tread ground contact end, and the tread portion extends continuously in the tire circumferential direction between the tire equatorial line and the inner tread ground contact end. A first main groove and a plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end are provided, and the distance in the tire axial direction from the tire equatorial line to the groove center line of the first main groove is The outer tread portion is 0.20 times or less the half width of the tread, and the outer tread portion is not provided with a main groove continuously extending in the tire circumferential direction.

In the tire of the present invention, it is desirable that the first lateral groove is arranged at an angle of 0 to 20 ° with respect to the tire axial direction.

In the tire of the present invention, the tread portion is provided with a plurality of second lateral grooves extending from the first main groove toward the outer tread ground contact end side and interrupting between the tire equator and the outer tread ground contact end. Is desirable.

In the tire of the present invention, it is desirable that the second lateral groove is arranged at an angle of 0 to 20 ° with respect to the tire axial direction.

In the tire of the present invention, it is desirable that the depth of the first lateral groove gradually decreases toward the outer tread ground contact end side.

In the tire of the present invention, it is desirable that the tread portion is provided with a second main groove continuously extending in the tire circumferential direction between the first main groove and the inner tread ground contact end.

In the tire of the present invention, it is desirable that the groove width of the second main groove is larger than the groove width of the first main groove.

In the tire of the present invention, it is desirable that the distance in the tire axial direction from the tire equator to the groove center line of the second main groove is 0.65 to 0.85 times the half width of the tread.

In the tire of the present invention, it is desirable that the tread portion is provided with a plurality of third lateral grooves extending from the second main groove toward the outer tread ground contact end side and interrupted in front of the first main groove.

In the tire of the present invention, it is desirable that the tread portion is provided with a plurality of fourth lateral grooves extending from the second main groove to at least the inner tread ground contact end.

In the tire of the present invention, it is desirable that the groove width of the fourth lateral groove is larger than the groove width of the third lateral groove.

In the tire of the present invention, it is desirable that each of the third lateral groove and the fourth lateral groove does not intersect the region where the first lateral groove extends along the tire axial direction.

In the tread portion of the tire of the present invention, a first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end, and a plurality of first main grooves extending from the first main groove to at least the outer tread ground contact end. 1 Horizontal groove is provided. Further, the distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.

Since the first main groove is provided at a position close to the equator of the tire, water near the equator of the tire can be effectively discharged when going straight on a wet road surface. Further, since the first lateral groove extends from the first main groove to the outer tread ground contact end, the outer tread that supplements the drainage property of the first main groove and exerts a large ground pressure when turning on a wet road surface. The drainage of the part can be ensured.

The outer tread portion of the tire of the present invention is not provided with a main groove that extends continuously in the tire circumferential direction. Therefore, the outer tread portion has high lateral rigidity and can exhibit excellent cornering performance on a circuit, for example.

It is a development view of the tread part of the tire of one Embodiment of this invention. FIG. 3 is a sectional view taken along line AA of FIG. It is an enlarged view of the tread part which shows the 1st main groove and the 2nd main groove of FIG. (A) is a sectional view taken along line BB of FIG. 3, and (B) is a sectional view taken along line CC of FIG. It is an enlarged view of the inner tread part of FIG. FIG. 5 is a sectional view taken along line DD of FIG. It is a development view of the tread part of the tire of the comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a developed view of the tread portion 2 of the tire 1 of the present embodiment. FIG. 2 shows a sectional view taken along line AA of the tread portion 2 of FIG. As shown in FIGS. 1 and 2, the tire 1 of the present embodiment is used, for example, as a pneumatic tire for a passenger car, and particularly as a high-performance tire premised on use in both public road driving and circuit driving. It is preferably used.

The tire 1 has a tread portion 2 whose mounting direction on the vehicle is designated. The orientation of mounting on the vehicle is indicated by characters or marks on, for example, a sidewall portion (not shown). In FIGS. 1 and 2, when the tire 1 is mounted on the vehicle, the left side corresponds to the inside of the vehicle and the right side of FIG. 1 corresponds to the outside of the vehicle.

By designating the mounting direction on the vehicle, the tread portion 2 has an outer tread ground contact end To that is outside the vehicle when mounted on the vehicle and an inner tread ground contact end Ti that is inside the vehicle when mounted on the vehicle. ..

The outer tread ground contact end To and the inner tread ground contact end Ti are cambered by applying a normal load to a tire 1 in a normal state in which a normal rim (not shown) is rim-assembled, a normal internal pressure is applied, and there is no load. This is the outermost contact position in the tire axial direction when the tire is grounded on a flat surface at an angle of 0 °.

A "regular rim" is a rim defined for each tire in the standard system including the standard on which the tire is based. For example, "standard rim" for JATTA and "Design Rim" for TRA. If it is ETRTO, it is "Measuring Rim".

"Regular internal pressure" is the air pressure defined for each tire in the standard system including the standard on which the tire is based. For JATTA, "maximum air pressure", for TRA, the table "TIRE LOAD LIMITS AT" The maximum value described in "VARIOUS COLD INFLATION PRESSURES", or "INFLATION PRESSURE" for ETRTO.

"Regular load" is the load defined for each tire in the standard system including the standard on which the tire is based. "Maximum load capacity" for JATTA and "TIRE LOAD LIMITS" for TRA. The maximum value described in "AT VARIOUS COLD INFLATION PRESSURES", or "LOAD CAPACITY" for ETRTO.

The tread portion 2 includes an outer tread portion 4 between the tire equator C and the outer tread ground contact end To, and an inner tread portion 5 between the tire equator C and the inner tread ground contact end Ti. The tread portion 2 includes a first main groove 11 extending continuously in the tire circumferential direction between the tire equator C and the inner tread ground contact end Ti, and a plurality of extending from the first main groove 11 to at least the outer tread ground contact end To. A first lateral groove 16 is provided. In addition, in this specification, a "main groove" means a groove which extends continuously in the tire circumferential direction with a groove width of 5.0 mm or more. The groove width is the distance between the two groove edges in the direction orthogonal to the length direction of the groove. The “horizontal groove” means a groove extending in the tire axial direction, but includes an aspect extending diagonally with respect to the tire axial direction.

FIG. 3 shows an enlarged view of the tread portion 2 showing the first main groove 11 and the first lateral groove 16. As shown in FIG. 3, the distance L1 in the tire axial direction from the tire equator C to the groove center line of the first main groove 11 is 0.20 times or less the tread half width TWh. The half-width tread TWh corresponds to the distance in the tire axial direction from the tire equator C to the outer tread ground contact end To or from the tire equator C to the inner tread ground contact end Ti in the normal state.

Since the first main groove 11 is provided at a position close to the tire equator C, water in the vicinity of the tire equator C can be effectively discharged when traveling straight on a wet road surface. Further, since the first lateral groove 16 extends from the first main groove 11 to the outer tread ground contact end To, the drainage property of the first main groove 11 is supplemented, and a large contact pressure is applied when turning on a wet road surface. The drainage property of the acting outer tread portion 4 can be ensured.

The outer tread portion 4 of the tire 1 of the present invention is not provided with a main groove that extends continuously in the tire circumferential direction. Therefore, the outer tread portion 4 has high lateral rigidity, and can exhibit excellent cornering performance on a circuit, for example.

As described above, the main groove is a groove having a groove width of 5.0 mm or more and continuously extending in the tire circumferential direction. The outer tread portion 4 of the present invention may be provided with a vertical groove that deviates from the definition of the main groove. That is, the outer tread portion 4 has, for example, a medium-width vertical groove extending in the tire circumferential direction with a groove width of less than 5.0 mm and 3.5 mm or more, or a tire circumference having a groove width of less than 3.5 mm and 1.5 mm or more. A narrow vertical groove extending in the direction or a vertical sipe having a width of less than 1.5 mm and extending in the tire circumferential direction may be provided.

In the tire 1 of the present invention, a mode in which the outer tread portion 4 is not provided with a main groove and a medium-sized vertical groove, or a mode in which the main groove, the medium-sized vertical groove, and the small vertical groove are not provided can be adopted. As a more desirable embodiment, the outer tread portion 4 of the present embodiment is not provided with any of the medium-width vertical groove, the narrow-width vertical groove, and the vertical sipe. That is, the outer tread portion 4 of the present embodiment is provided with only a plurality of first lateral grooves 16.

In the first main groove 11 of the present embodiment, the groove edges 11e on both sides are arranged in the inner tread portion 5. Further, the distance L1 from the tire equator C to the groove center line of the first main groove 11 is preferably 0.05 times or more, more preferably 0.10 times or more, and preferably 0. It is 18 times or less, more preferably 0.15 times or less. Such a first main groove 11 can enhance the wet performance and the cornering performance on a dry road surface in a well-balanced manner.

The first main groove 11 of the present embodiment extends linearly in parallel with the tire circumferential direction with a constant groove width, for example. However, the present invention is not limited to such an aspect, and the first main groove 11 may contain, for example, a component in which the groove width changes in the tire circumferential direction or extends diagonally in the tire circumferential direction, and may be wavy or zigzag. It may extend in a shape.

The groove width W1 of the first main groove 11 is, for example, 0.10 to 0.20 times the tread half width TWh. Such a first main groove 11 can improve wet performance while maintaining the pattern rigidity of the tread portion 2.

As shown in FIG. 2, it is desirable that the depth d1 of the first main groove 11 is at least 4 mm or more. More specifically, the depth d1 of the first main groove 11 is preferably 5.0 to 6.5 mm. As a result, the cornering performance and the wet performance on the dry road surface are improved in a well-balanced manner.

It is desirable that the first main groove 11 includes, for example, a chamfered portion 21 having a recessed corner portion between the groove edge 11e and the groove wall 11w. The angle θ1 of the chamfered portion 21 with respect to the tread normal passing through the groove edge 11e is preferably 45 to 75 °, more preferably 55 to 65 °. Such a chamfered portion 21 is useful for suppressing uneven wear of the groove edge while improving the drainage property of the first main groove 11.

As shown in FIG. 3, the first lateral groove 16 extends in the tire axial direction with a constant groove width, for example. The first lateral groove 16 of the present embodiment is slightly curved and extends so as to be convex in the tire circumferential direction, for example.

The first lateral groove 16 is arranged at an angle of 45 ° or less, preferably 35 ° or less with respect to the tire axial direction, for example. As a further preferred embodiment, the first lateral groove 16 of the present embodiment is arranged at an angle θ2 of 0 to 20 ° with respect to the tire axial direction, for example. Such a first lateral groove 16 can maintain the lateral rigidity of the outer tread portion 4 and enhance the wet performance without impairing the cornering performance.

It is desirable that the angle θ2 of the first lateral groove 16 with respect to the tire axial direction gradually increases, for example, toward the outer tread ground contact end To side. Such a first lateral groove 16 can guide the water in the groove to the outer tread ground contact end To side during wet running, and can further improve the wet performance.

The angle θ3 between the groove center line of the first horizontal groove 16 and the groove center line of the first main groove 11 is preferably 70 to 90 °, for example. As a result, the communication portion between the first main groove 11 and the first horizontal groove 16 can exhibit high drainage.

The groove width W3 of the first lateral groove 16 is, for example, 0.02 to 0.12 times the tread half width TWh, and preferably 0.06 to 0.12 times. It is desirable that the groove width W3 of the first lateral groove 16 is smaller than, for example, the groove width W1 of the first main groove 11. Specifically, the groove width W3 of the first horizontal groove 16 is 0.50 to 0.70 times the groove width W1 of the first main groove 11. Such a first lateral groove 16 can improve the wet performance and the cornering performance in a well-balanced manner.

FIG. 4A shows a sectional view taken along line BB of the first lateral groove 16. As shown in FIG. 4A, the maximum depth d3 of the first lateral groove 16 is 0.90 to 1.10 times the depth d1 of the first main groove 11 (shown in FIG. 2). In this embodiment, it is the same as the depth d1 of the first main groove 11.

As shown in FIG. 2, it is desirable that the depth of the first lateral groove 16 gradually decreases toward, for example, the outer tread ground contact end To side. Such a first lateral groove 16 can gradually increase the rigidity of the outer tread portion 4 toward the outer tread ground contact end To side, and thus can improve the steering stability at the time of a sharp turn.

As shown in FIG. 4A, it is desirable that the first lateral groove 16 includes, for example, a chamfered portion 23 having a recessed corner portion between the groove edge 16e and the groove wall 16w. The angle θ4 with respect to the tread normal passing through the groove edge 16e of the chamfered portion 23 is preferably, for example, 45 to 60 °. Such a chamfered portion 23 is useful for suppressing uneven wear of the groove edge while improving the drainage property of the first lateral groove 16.

As shown in FIG. 3, it is desirable that the tread portion 2 is provided with a plurality of second lateral grooves 17. The second lateral groove 17 extends from the first main groove 11 to the outer tread ground contact end To side and is interrupted between the tire equator C and the outer tread ground contact end To. In the present embodiment, the first lateral groove 16 and the second lateral groove 17 are alternately provided in the tire circumferential direction.

The second lateral groove 17 is slightly curved and extends so as to be convex in the tire circumferential direction, for example. The second lateral groove 17 of the present embodiment is curved in the same direction as the first lateral groove 16. In a preferred embodiment, the second lateral groove 17 is curved with a smaller curvature than the first lateral groove 16.

The second lateral groove 17 is arranged at an angle of 45 ° or less, preferably 35 ° or less with respect to the tire axial direction, for example. As a more preferable embodiment, the second lateral groove 17 of the present embodiment is arranged at an angle θ5 of 0 to 20 ° with respect to the tire axial direction, for example. Such a second lateral groove 17 can improve wet performance together with the first lateral groove 16 while maintaining the lateral rigidity of the outer tread portion 4.

The second lateral groove 17 is interrupted on the tire equator C side of the center position of the outer tread portion 4 in the tire axial direction, for example. In a preferred embodiment, the length L3 of the second lateral groove 17 in the tire axial direction is the groove center line of the first main groove 11 from the intersection of the groove center line of the first main groove 11 and the groove center line of the first lateral groove 16. It is smaller than the distance L4 in the tire circumferential direction to the intersection of the second horizontal groove 17 with the groove center line. Specifically, the length L3 of the second lateral groove 17 in the tire axial direction is preferably 0.20 to 0.60 times the tread half width TWh, and more preferably 0.30 to 0.50 times. Such a second lateral groove 17 is useful for improving wet performance and cornering performance in a well-balanced manner.

It is desirable that the groove width W4 of the second horizontal groove 17 is smaller than, for example, the groove width W1 of the first main groove 11. Further, it is desirable that the groove width W4 of the second horizontal groove 17 is smaller than the groove width W3 of the first horizontal groove 16. Specifically, it is desirable that the groove width W4 of the second horizontal groove 17 is 0.60 to 0.90 times the groove width W3 of the first horizontal groove 16.

FIG. 4B shows a sectional view taken along line CC of the second lateral groove 17. As shown in FIG. 4B, the maximum depth d4 of the second lateral groove 17 is, for example, 0.90 to 1 of the maximum depth d3 of the first lateral groove 16 (shown in FIG. 4A). .10 times, which is the same as the depth d3 in this embodiment. It is desirable that the second lateral groove 17 has the same chamfered portion 25 as the first lateral groove 16.

FIG. 5 shows an enlarged view of the inner tread portion 5. As shown in FIG. 5, the inner tread portion 5 of the present embodiment is provided with a second main groove 12. The second main groove 12 extends continuously in the tire circumferential direction between the first main groove 11 and the inner tread ground contact end Ti.

The second main groove 12 is provided, for example, on the inner tread ground contact end Ti side with respect to the center position of the inner tread portion 5 in the tire axial direction. Specifically, it is desirable that the distance L2 in the tire axial direction from the tire equator C to the groove center line of the second main groove 12 is 0.65 to 0.85 times the tread half width TWh. Such a second main groove 12 can effectively discharge water between the inner tread portion 5 and the road surface during wet running.

The groove width W2 of the second main groove 12 is, for example, 0.15 to 0.25 times the tread half width TWh. It is desirable that the groove width W2 of the second main groove 12 is larger than, for example, the groove width W1 of the first main groove 11 (shown in FIG. 3). The groove width W2 of the second main groove 12 is, for example, 1.05 to 1.20 times the groove width W1 of the first main groove 11. Such a second main groove 12 is useful for enhancing traction on a wet road surface.

As shown in FIG. 2, the second main groove 12 has, for example, a depth in the same range as the depth of the first main groove 11 described above. The depth d2 of the second main groove 12 of the present embodiment is the same as the depth d1 of the first main groove 11. Further, the second main groove 12 has, for example, a chamfered portion similar to that of the first main groove 11.

As shown in FIG. 5, the inner tread portion 5 is located between the first land portion 8 between the first main groove 11 and the second main groove 12 and between the second main groove 12 and the inner tread ground contact end Ti. Includes the second tread 9 of. The width W5 of the first land portion 8 in the tire axial direction is at least 0.25 times or more the tread half width TWh. The width W5 of the first land portion 8 of the present embodiment is preferably 0.35 to 0.65 times, more preferably 0.40 to 0.55 times the tread half width TWh. The width W6 of the second land portion 9 in the tire axial direction is, for example, 0.10 to 0.20 times the tread half width TWh.

The inner tread portion 5 is provided with a plurality of third lateral grooves 18. The third lateral groove 18 extends from the second main groove 12 toward the outer tread ground contact end To side and is interrupted in front of the first main groove 11. Such a third lateral groove 18 can improve wet performance while maintaining the rigidity of the first land portion 8.

The third lateral groove 18 extends in the tire axial direction with a constant groove width, for example. The first lateral groove 16 of the present embodiment is slightly curved and extends so as to be convex in the tire circumferential direction, for example. The third lateral groove 18 of the present embodiment is convex in the opposite direction to, for example, the first lateral groove 16 and the second lateral groove 17 (shown in FIG. 3). The third lateral groove 18 is curved with a curvature smaller than that of the first lateral groove 16, for example.

The third lateral groove 18 is arranged at an angle of 45 ° or less, preferably 35 ° or less with respect to the tire axial direction, for example. As a further preferred embodiment, the third lateral groove 18 of the present embodiment is arranged at an angle θ6 of 0 to 20 ° with respect to the tire axial direction, for example.

The third lateral groove 18 is interrupted on the tire equator C side of the center position of the first land portion 8 in the tire axial direction, for example. The length L5 of the third lateral groove 18 in the tire axial direction is smaller than, for example, the length L3 of the second lateral groove 17 in the tire axial direction (shown in FIG. 3). Specifically, the length L5 of the third lateral groove 18 in the tire axial direction is preferably 0.25 to 0.40 times the tread half width TWh. Such a third lateral groove 18 can enhance the wet performance and the cornering performance in a well-balanced manner.

It is desirable that the third lateral groove 18 has, for example, the same groove width and groove depth as the above-mentioned second lateral groove 17. Further, it is desirable that the third lateral groove 18 has the same cross-sectional shape as the second lateral groove 17.

It is desirable that the inner tread portion 5 is provided with a plurality of fourth lateral grooves 19. The fourth lateral groove 19 extends from the second main groove 12 to at least the inner tread ground contact end Ti. Such a fourth lateral groove 19 is useful for enhancing traction on a wet road surface.

The fourth lateral groove 19 is arranged at an angle of 0 to 20 ° with respect to the tire axial direction, for example. The fourth lateral groove 19 of the present embodiment is 0 ° with respect to the tire axial direction.

It is desirable that the groove width W7 of the fourth horizontal groove 19 is smaller than, for example, the groove width W1 of the first main groove 11 and the groove width W2 of the second main groove 12. Further, it is desirable that the groove width W7 of the fourth lateral groove 19 is larger than the groove width of the third lateral groove 18, for example. Specifically, the groove width W7 of the fourth horizontal groove 19 is, for example, 0.65 to 0.75 times the groove width W2 of the second main groove 12.

FIG. 6 shows a sectional view taken along line DD of the fourth lateral groove 19. As shown in FIG. 6, it is desirable that the depth d5 of the fourth lateral groove 19 is, for example, the same as the depth d2 (shown in FIG. 2) of the second main groove 12.

It is desirable that the fourth lateral groove 19 does not have a chamfered portion, for example, and has a groove wall 19w extending from the groove edge 19e at a constant angle. Such a fourth lateral groove 19 can provide a high frictional force by its edge and enhance traction on a wet road surface.

As shown in FIG. 1, it is desirable that the fourth lateral groove 19 does not intersect with, for example, a region extending the third lateral groove 18 along the tire axial direction. The region corresponds to a region in which the third lateral groove 18 is extended in parallel with the tire axial direction. It is desirable that the third lateral groove 18 and the fourth lateral groove 19 are alternately provided in the tire circumferential direction.

It is desirable that each of the third lateral groove 18 and the fourth lateral groove 19 does not intersect the region extending the first lateral groove 16 along the tire axial direction. The region corresponds to a region in which the first lateral groove 16 is extended in parallel with the tire axial direction. It is desirable that each of the third lateral groove 18 and the fourth lateral groove 19 does not intersect the region extending the second lateral groove 17 along the tire axial direction. Such an arrangement of each lateral groove helps to suppress uneven wear of the tread portion while allowing each lateral groove to exhibit high drainage.

Although the tire of one embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment described above, and may be modified into various embodiments.

A size 205 / 55R16 tire with the basic tread pattern of FIG. 1 was prototyped based on the specifications in Table 1. As a comparative example, as shown in FIG. 7, a main groove b provided in the outer tread portion a and a plurality of lateral grooves c extending from the main groove b to the outer tread ground contact end To side and interrupted in the outer tread portion a. A tire with tread was prototyped. Wet performance and cornering performance on dry roads of each test tire were tested. The common specifications and test methods for each test tire are as follows.
Rim: 16 x 6.5J
Tire internal pressure: 230kPa

<Wet performance>
An inside drum tester was used, and the rate of occurrence of the hydroplaning phenomenon was measured when each test tire traveled on a drum surface at a depth of 5.0 mm under the following conditions. The result is an index with Comparative Example 1 as 100, and the larger the value, the higher the generation rate and the better the wet performance.
Slip angle: 1.0 °
Vertical load: 4.2kN

<Cornering performance on dry roads>
The cornering performance of the following test vehicle equipped with the above test tires when traveling on a circuit course on a dry road surface was evaluated by the driver's sensuality. The result is a score with a comparative example of 100, and the larger the value, the better the steering stability.
Test vehicle: Displacement 2000cc, rear-wheel drive vehicle Test tire mounting position: All-wheel test results are shown in Table 1.

As a result of the test, it was confirmed that the tire of the example exhibited excellent cornering performance while ensuring wet performance.

2 Tread part 4 Outer tread part 11 1st main groove 16 1st lateral groove C Tire equator To Outer tread ground contact end Ti Inner tread ground contact end

Claims (10)

A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
The first lateral groove is arranged at an angle of 0 to 20 ° with respect to the tire axial direction.
tire. A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end,
A plurality of second lateral grooves extending from the first main groove toward the outer tread ground contact end and interrupting between the tire equator and the outer tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
tire. The tire according to claim 2, wherein the second lateral groove is arranged at an angle of 0 to 20 ° with respect to the tire axial direction. A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
The depth of the first lateral groove gradually decreases toward the outer tread ground contact end side.
tire. A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A second main groove continuously extending in the tire circumferential direction between the first main groove and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
The groove width of the second main groove is larger than the groove width of the first main groove.
tire. A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A second main groove continuously extending in the tire circumferential direction between the first main groove and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
The distance in the tire axial direction from the tire equator to the groove center line of the second main groove is 0.65 to 0.85 times the half width of the tread.
tire. A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A second main groove continuously extending in the tire circumferential direction between the first main groove and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
The tread portion is provided with a plurality of third lateral grooves extending from the second main groove toward the outer tread ground contact end side and interrupted in front of the first main groove.
tire. A tire with a tread that is oriented to be mounted on a vehicle.
The tread portion has an outer tread ground contact end that is outside the vehicle when mounted on the vehicle, an inner tread ground contact end that is inside the vehicle when mounted on the vehicle, and an outer tread portion between the tire equator and the outer tread ground contact end. ,
In the tread part,
A first main groove extending continuously in the tire circumferential direction between the tire equator and the inner tread ground contact end,
A second main groove continuously extending in the tire circumferential direction between the first main groove and the inner tread ground contact end,
A plurality of first lateral grooves extending from the first main groove to at least the outer tread ground contact end,
A plurality of fourth lateral grooves extending from the second main groove to at least the inner tread ground contact end are provided.
The distance in the tire axial direction from the tire equator to the groove center line of the first main groove is 0.20 times or less the half width of the tread.
The outer tread portion is not provided with a main groove that continuously extends in the tire circumferential direction.
tire. The tread portion is provided with a plurality of third lateral grooves extending from the second main groove toward the outer tread ground contact end side and interrupted in front of the first main groove.
The tire according to claim 8, wherein the groove width of the fourth lateral groove is larger than the groove width of the third lateral groove. The tread portion is provided with a plurality of third lateral grooves extending from the second main groove toward the outer tread ground contact end side and interrupted in front of the first main groove.
The tire according to claim 8, wherein each of the third lateral groove and the fourth lateral groove does not intersect with a region extending the first lateral groove along the tire axial direction.

Images