JP2018012437A - tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire having excellent wet performance.SOLUTION: A tire has a tread part 2 in which a direction of mounting to a vehicle is specified. The tread part 2 includes: an outer shoulder land part 10 having an outer tread end; an outer middle land part 11 adjacent to the outer shoulder land part 10; and an outer shoulder main groove 3 extending in a tire circumferential direction therebetween. The outer shoulder land part 10 is provided with a plurality of outer shoulder lateral grooves 15. The outer middle land part 11 is provided with a plurality of first outer middle lug grooves 18. Each of the first outer middle lug grooves 18 is arranged at a position where the groove smoothly continues to any of the outer shoulder lateral grooves 15 through the outer shoulder main groove 3. Each of the outer middle lug grooves 18 is a bent groove which includes an outer part 21 at an outer shoulder main groove 3 side and an inner part 22 having an angle relative to the tire circumferential direction smaller than that of the outer part 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tire having excellent wet performance.

  For example, Patent Document 1 below proposes a tire in which a tread portion is provided with an outer shoulder lateral groove and an outer middle lug groove that communicate with the outer shoulder main groove. In order to improve wet performance, the outer middle lug groove of the tire is arranged at a position that is smoothly continuous with the outer shoulder lateral groove via the outer shoulder main groove.

  However, the entire outer middle lug groove of Patent Document 1 is inclined at a constant angle. Such an outer middle lug groove has a tendency to make it difficult for water in the groove to move to the outer shoulder main groove side during wet running, and there is room for further improvement in improving wet performance.

JP, 2015-171840, A

  The present invention has been devised in view of the above problems, and its main purpose is to provide a tire having excellent wet performance on the basis of improving the arrangement of the outer shoulder lateral groove and the outer middle lug groove. Yes.

  The present invention is a tire having a tread portion in which the direction of mounting on a vehicle is specified, wherein the tread portion has an outer tread end positioned on the vehicle outer side when the vehicle is mounted, and the tread portion An outer shoulder land portion having a tread end, an outer middle land portion adjacent to the outer shoulder land portion, and an outer shoulder main groove extending in the tire circumferential direction between the outer shoulder land portion, the outer shoulder land portion, A plurality of outer shoulder lateral grooves extending from the outer shoulder main groove to the outer tread end are provided, and the outer middle land portion extends obliquely from the outer shoulder main groove and terminates in the outer middle land portion. A plurality of grooves are provided, and each of the first outer middle lug grooves slides with one of the outer shoulder lateral grooves via the outer shoulder main groove. Each of the first outer middle lug grooves includes an outer portion on the outer shoulder main groove side and an inner portion having an angle with respect to the tire circumferential direction smaller than the outer portion. It is characterized by.

  In the tire of the present invention, it is preferable that the outer shoulder lateral groove includes a bent groove including an outer portion on the outer tread end side and an inner portion bent with respect to the outer portion.

  In the bent groove of the tire of the present invention, the inner portion has a gradually increasing groove width toward the outer tread end side, and the outer portion has a groove width gradually decreasing toward the outer tread end side. Is desirable.

  In the tire according to the present invention, it is preferable that the outer shoulder lateral groove has a maximum groove width at a connection portion between the inner portion and the outer portion.

  In the tire of the present invention, it is desirable that the length of the inner portion in the tire axial direction is smaller than the length of the first outer middle lug groove in the tire axial direction.

  In the tire of the present invention, an outer crown main groove is adjacent to the outer middle land portion on the side opposite to the outer shoulder main groove, and the outer middle land portion is inclined from the outer crown main groove. It is desirable that a second outer middle lug groove that extends and terminates in the outer middle land portion is provided, and the second outer middle lug groove is inclined in a direction opposite to the first outer middle lug groove.

  The outer shoulder land portion of the tire of the present invention is provided with a plurality of outer shoulder lateral grooves extending from the outer shoulder main groove to the outer tread end. The outer middle land portion is provided with a plurality of first outer middle lug grooves extending obliquely from the outer shoulder main groove and terminating in the outer middle land portion. Each of the first outer middle lug grooves is disposed at a position that is smoothly connected to one of the outer shoulder lateral grooves via the shoulder main groove. Such a groove arrangement can form a continuous drainage path from the inner end to the outer tread end of the first outer middle lug groove during wet running, and can exhibit excellent wet performance.

  Each first outer middle lug groove is a bent groove including an outer portion on the outer shoulder main groove side and an inner portion having an angle with respect to the tire circumferential direction smaller than the outer portion. The first outer middle lug groove can smoothly move the water in the groove toward the outer shoulder main groove as the tire rotates during wet running, thereby further improving the wet performance.

It is an expanded view of the tread part of the tire of one embodiment of the present invention. It is an enlarged view of the outer side shoulder land part and outer side middle land part of FIG. It is an enlarged view of the inner side shoulder land part and inner side middle land part of FIG. It is an enlarged view of the crown land part of FIG. It is an enlarged view of the outer side shoulder land part and outer side middle land part of other embodiment of this invention. It is an expanded view of the tread part of the tire of a comparative example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a development view of a tread portion 2 of a tire 1 showing an embodiment of the present invention. The tire 1 of the present invention can be used for various tires such as pneumatic tires for passenger cars and heavy loads, and non-pneumatic tires that are not filled with pressurized air inside the tires. The tire 1 of this embodiment is suitably used as a pneumatic tire for passenger cars.

  As shown in FIG. 1, the tread portion 2 includes an asymmetric tread pattern in which the mounting direction of the vehicle is specified. The tread portion 2 has an outer tread end To positioned on the vehicle outer side when the tire 1 is mounted on the vehicle, and an inner tread end Ti positioned on the vehicle inner side when the vehicle is mounted. The direction of mounting on the vehicle is displayed, for example, with letters or symbols on a sidewall (not shown).

  In the case of a pneumatic tire, each tread end To, Ti is a grounding position on the outermost side in the tire axial direction when a regular load is applied to the regular tire 1 and grounded on a plane with a camber angle of 0 °. The normal state is a state in which the tire is assembled on the normal rim and is filled with the normal internal pressure, and further, there is no load. In the present specification, unless otherwise specified, the dimensions and the like of each part of the tire are values measured in a normal state.

  The “regular rim” is a rim determined for each tire in the standard system including the standard on which the tire is based. For example, “Standard Rim” for JATMA, “Design Rim” for TRA, and “ETRTO” If there is "Measuring Rim".

  “Regular internal pressure” is the air pressure that each standard defines for each tire in the standard system including the standard on which the tire is based. “JAMATA” is the “highest air pressure”, TRA is the table “TIRE LOAD LIMITS AT” The maximum value described in “VARIOUS COLD INFLATION PRESSURES”, “INFLATION PRESSURE” for ETRTO.

  “Regular load” is a load determined by each standard for each tire in the standard system including the standard on which the tire is based. “JATMA” is “Maximum load capacity”, TRA is “TIRE LOAD LIMITS” The maximum value described in “AT VARIOUS COLD INFLATION PRESSURES”, “LOAD CAPACITY” in the case of ETRTO.

  In the tread portion 2 of the present embodiment, for example, an outer shoulder main groove 3, an outer crown main groove 4, an inner shoulder main groove 5, and an inner crown main groove 6 extending continuously in the tire circumferential direction are provided. . The outer shoulder main groove 3 is provided on the outermost tread end To side. The outer crown main groove 4 is provided between the outer shoulder main groove 3 and the tire equator C, for example. The inner shoulder main groove 5 is provided, for example, on the innermost tread end Ti side. The inner crown main groove 6 is provided between the inner shoulder main groove 5 and the tire equator C. Each of the main grooves 3 to 6 desirably extends linearly along the tire circumferential direction, for example.

  The distance in the tire axial direction from the tire equator C to the outer shoulder main groove 3 or the inner shoulder main groove 5 is preferably, for example, 0.25 to 0.35 times the tread width TW. The distance in the tire axial direction from the tire equator C to the outer crown main groove 4 or the inner crown main groove 6 is preferably 0.08 to 0.15 times the tread width TW, for example. However, the arrangement of the main grooves is not limited to such a range. The tread width TW is a distance in the tire axial direction between the outer tread end To and the inner tread end Ti in the normal state.

  In order to improve the steering stability and wet performance on a dry road surface in a well-balanced manner, the groove widths W1 to W4 of the main grooves 3 to 6 are preferably 4 to 8% of the tread width TW, for example. From the same viewpoint, the groove depth of each of the main grooves 3 to 6 is preferably 5.0 to 12.0 mm, for example.

  In order to improve steering stability, the outer shoulder main groove 3 preferably has the smallest groove width among the main grooves 3 to 6, for example. The groove width W1 of the outer shoulder main groove 3 is preferably 0.20 to 0.90 times the groove width W4 of the inner shoulder main groove 5, for example. As a result, the rigidity of the outer side in the tire axial direction of the tread portion 2 is increased, and as a result, excellent steering stability is obtained.

  The tread portion 2 is provided with the above-described main groove, so that the outer shoulder land portion 10, the outer middle land portion 11, the inner shoulder land portion 12, the inner middle land portion 13, and the crown land portion 14 are separated. Yes.

  FIG. 2 shows an enlarged view of the outer shoulder land portion 10 and the outer middle land portion 11. As shown in FIG. 2, the outer shoulder land portion 10 is formed between the outer shoulder main groove 3 and the outer tread end To. The outer middle land portion 11 is formed between the outer shoulder main groove 3 and the outer crown main groove 4, and is adjacent to the outer shoulder land portion 10 via the outer shoulder main groove 3.

  The outer shoulder land portion 10 is provided with a plurality of outer shoulder lateral grooves 15. Each outer shoulder lateral groove 15 extends from the outer shoulder main groove 3 to the outer tread end To. Such an outer shoulder lateral groove 15 can discharge the water in the outer shoulder main groove 3 from the outer tread end To during wet running, thereby improving the wet performance. A more detailed configuration of the outer shoulder lateral groove 15 will be described later.

  The outer middle land portion 11 is provided with a plurality of first outer middle lug grooves 18. The first outer middle lug groove 18 extends obliquely from the outer shoulder main groove 3 and terminates in the outer middle land portion 11.

  Each first outer middle lug groove 18 is disposed at a position that is smoothly continuous with any one of the outer shoulder lateral grooves 15 via the outer shoulder main groove 3. Note that “smoothly continuous” includes an aspect in which one groove is continuous with the other groove so as to form one groove when the groove is virtually extended along the groove shape.

  The arrangement of the first outer middle lug groove 18 and the outer shoulder lateral groove 15 is substantially continuous through the outer shoulder main groove 3 from the inner end of the first outer middle lug groove 18 to the outer tread end To during wet running. A drainage path is formed, and excellent wet performance can be exhibited.

  Each first outer middle lug groove 18 includes an outer portion 21 on the outer shoulder main groove 3 side and an inner portion 22 having an angle with respect to the tire circumferential direction smaller than the outer portion. Such a first outer middle lug groove 18 can smoothly move the water in the groove toward the outer shoulder main groove 3 with the rotation of the tire during wet running, thereby further improving the wet performance. .

  In order to further exert the above-described effects, the angle θ1 of the outer portion 21 with respect to the tire circumferential direction is preferably, for example, 50 to 70 °. The angle θ2 of the inner portion 22 with respect to the tire circumferential direction is preferably, for example, 30 to 45 °.

  The crossing angle θ3 between the outer portion 21 and the inner portion 22 is preferably 140 ° or more, more preferably 145 ° or more, preferably 160 ° or less, more preferably 155 ° or less.

  The first outer middle lug groove 18 of the present embodiment is, for example, a bent groove that is partially bent. The bent groove can make the angle θ2 of the inner portion 22 smaller, and can further exert the above-described effects. However, the first outer middle lug groove 18 may be a groove that curves smoothly. Such first outer middle lug groove 18 can prevent uneven wear of the edge.

  The length L1 of the first outer middle lug groove 18 in the tire axial direction is preferably 0.40 to 0.60 times the width W4 of the outer middle land portion 11 in the tire axial direction, for example. Such first outer middle lug groove 18 can improve wet performance while maintaining the rigidity of outer middle land portion 11.

  It is desirable that the groove width of the first outer middle lug groove 18 gradually increases toward the outer tread end To side. Such first outer middle lug groove 18 is useful for guiding water in the groove toward the outer shoulder main groove 3 side during wet running.

  The outer middle land portion 11 of the present embodiment is further provided with a plurality of second outer middle lug grooves 19. Each second outer middle lug groove 19 extends obliquely from the outer crown main groove 4 and terminates in the outer middle land portion 11. In the present embodiment, the first outer middle lug groove 18 and the second outer middle lug groove 19 are alternately provided in the tire circumferential direction without intersecting each other. Such arrangement of the lug grooves 18 and 19 can improve the wet performance while maintaining the rigidity of the outer middle land portion 11.

  In order to further exhibit the above-described effects, it is desirable that each second outer middle lug groove 19 be inclined in the opposite direction to the first outer middle lug groove 18, for example.

  The length L2 of the second outer middle lug groove 19 in the tire axial direction is preferably 0.40 to 0.60 times the width W4 of the outer middle land portion 11 in the tire axial direction, for example. In particular, the length L2 of the second outer middle lug groove 19 is preferably smaller than the length L1 of the first outer middle lug groove 18. Thereby, the rigidity of the inner side in the tire axial direction of the outer middle land portion 11 is maintained, and the steering stability is improved.

  As a more desirable mode, in the present embodiment, a region where the second outer middle lug groove 19 is projected in the tire circumferential direction contacts the first outer middle lug groove 18. Such arrangement of the lug grooves 18 and 19 can effectively prevent the occurrence of the hydroplaning phenomenon.

  The pitch P2 of the outer shoulder lateral grooves 15 is preferably 0.4 to 0.6 times the pitch P1 of the first outer middle lug grooves 18, for example. As a result, the outer shoulder lateral groove 15 disposed at a position smoothly continuing to the first outer middle lug groove 18 and the outer shoulder lateral groove 15 not adjacent to the first outer middle lug groove 18 are alternately provided in the tire circumferential direction. .

  It is desirable that at least one of the outer shoulder lateral grooves 15 is a bent groove including, for example, an outer portion 23 on the outer tread end To side and an inner portion 24 that is bent with respect to the outer portion 23. Such a bent groove can smoothly guide the water in the drainage path constituted by the first outer middle lug groove 18 and the outer shoulder lateral groove 15 to the outer tread end To side during wet running.

  In the present embodiment, the outer portion 23 is slightly inclined with respect to the tire axial direction, and the inner portion 24 is inclined in the direction opposite to the outer portion 23. However, it is not limited to such an embodiment, and the inner portion 24 may be inclined in the same direction as the outer portion 23.

  The crossing angle θ4 between the outer portion 23 and the inner portion 24 is preferably 150 ° or more, more preferably 155 ° or more, preferably 170 ° or less, more preferably 165 ° or less. Such outer shoulder lateral grooves 15 can obtain the above-described effects while suppressing local changes in rigidity of the outer shoulder land portion 10.

  For example, the groove width of the inner portion 24 of the outer shoulder lateral groove 15 gradually increases toward the outer tread end To side. On the other hand, the width of the outer portion 23 of the outer shoulder lateral groove 15 gradually decreases toward the outer tread end To. Such an outer shoulder lateral groove 15 can maintain the rigidity of the outer shoulder land portion 10 on the outer tread end To side while ensuring the groove volume of the inner portion 24, and as a result, the steering stability and wet performance on the dry road surface can be achieved. Helps to improve balance.

  In the present embodiment, the connection portion 25 between the inner portion 24 and the outer portion 23 has vertices 28 and 28 where the edge of the outer portion 23 and the edge of the inner portion 24 intersect. Further, the outer shoulder lateral groove 15 of the present embodiment has a maximum groove width between the vertices 28 and 28 of the connecting portion 25. The maximum groove width W5 of the outer shoulder lateral groove 15 is preferably 0.50 to 0.70 times the groove width W2 of the outer shoulder main groove 3, for example.

  It is desirable that the apexes 28 and 28 of the connecting portion 25 are displaced in the tire axial direction. Such a connection part 25 can suppress the uneven wear of the edge.

  The length L3 of the inner portion 24 of the outer shoulder lateral groove 15 in the tire axial direction is preferably smaller than the length L1 of the first outer middle lug groove 18 in the tire axial direction. Specifically, the length L3 of the inner portion 24 is preferably 0.70 to 0.90 times the length L1 of the first outer middle lug groove 18. As a result, uneven wear on the inner side in the tire axial direction of the outer shoulder land portion 10 is suppressed.

  An outer shoulder sipe 27 is further provided in the outer shoulder land portion 10 of the present embodiment. The outer shoulder sipe 27 is provided, for example, between the outer shoulder lateral grooves 15 adjacent in the tire circumferential direction.

  The outer shoulder sipe 27 extends inward in the tire axial direction from the outer tread end To and is interrupted in the outer shoulder land portion 10. As a further desirable aspect, the outer shoulder sipe 27 extends along the outer portion 23 of the outer shoulder lateral groove 15. Such an outer shoulder sipe 27 can suppress distortion of the tread between the outer shoulder lateral grooves 15 and 15.

  FIG. 3 shows an enlarged view of the inner shoulder land portion 12 and the inner middle land portion 13. As shown in FIG. 3, the inner shoulder land portion 12 is formed between the inner shoulder main groove 5 and the inner tread end Ti. The inner middle land portion 13 is divided between the inner shoulder main groove 5 and the inner crown main groove 6 and is adjacent to the inner shoulder land portion 12.

  The inner middle land portion 13 is preferably provided with, for example, a plurality of inner middle lateral grooves 30 that cross the land portion.

  Each inner middle lateral groove 30 includes, for example, a first portion 31 extending obliquely from the inner crown main groove 6 and a second portion continuing to the first portion 31 and extending in the opposite direction to the inner shoulder main groove 5. 32.

  The first portion 31 preferably has a length L4 in the tire axial direction that is larger than that of the second portion 32, for example. The length L4 of the first portion 31 is preferably 0.65 to 0.80 times the width W6 of the inner middle land portion 13 in the tire axial direction, for example. Such an inner middle lateral groove 30 can supplement the drainage of the inner crown main groove 6 during wet running.

  The crossing angle θ5 between the first portion 31 and the second portion 32 is preferably 100 to 140 °, more preferably 110 to 130 °. Such an inner middle lateral groove 30 can guide water in the groove to the main grooves on both sides without excessively reducing the rigidity of the inner middle land portion 13.

  The inner shoulder land portion 12 is provided with a plurality of inner shoulder lateral grooves 34 and a plurality of inner shoulder sipes 35, for example. The inner shoulder lateral groove 34 and the inner shoulder sipe 35 extend from the inner shoulder main groove 5 to the inner tread end Ti, respectively.

  The inner shoulder lateral groove 34 is preferably a bent groove including an outer portion 36 on the inner tread end Ti side and an inner portion 37 bent with respect to the outer portion 36, for example.

  In the present embodiment, the outer portion 36 is slightly inclined with respect to the tire axial direction, and the inner portion 37 is inclined in the direction opposite to the outer portion 36. However, it is not limited to such a mode, and the inner portion 37 may be inclined in the same direction as the outer portion 36.

  The groove width of the inner portion 37 of the inner shoulder lateral groove 34 gradually increases toward the inner tread end Ti side. The outer portion 36 of the inner shoulder lateral groove 34 has a groove width that gradually decreases toward the inner tread end Ti side. Thus, the inner shoulder lateral groove 34 has the maximum groove width at the connecting portion 38 between the outer portion 36 and the inner portion 37. Such an inner shoulder lateral groove 34 can maintain the groove volume of the inner portion 37 and maintain the rigidity on the inner tread end Ti side of the inner shoulder land portion 12, and thereby improve the steering stability and wet performance on the dry road surface. Helps to improve balance.

  The inner portion 37 of the inner shoulder lateral groove 34 is preferably inclined in the same direction as the second portion 32 of the inner middle lateral groove 30. As a more desirable mode, the opening on the inner shoulder main groove 5 side of the inner portion 37 and the second portion 32 is displaced in the tire circumferential direction. Thereby, the inner side shoulder lateral groove 34 and the inner middle lateral groove 30 are discontinuously arranged. Such a groove arrangement is useful for suppressing excessive opening of the grooves 34 and 30 and thus improving steering stability on a dry road surface.

  The inner shoulder sipe 35 is preferably bent along the outer portion 36 and the inner portion 37 of the inner shoulder lateral groove 34. Such an inner shoulder sipe 35 can suppress distortion of the tread between the inner shoulder lateral grooves 34.

  FIG. 4 shows an enlarged view of the crown land portion 14. As shown in FIG. 4, the crown land portion 14 is provided between the outer crown main groove 4 and the inner crown main groove 6.

  In order to improve the steering stability on the dry road surface, the crown land portion 14 of the present embodiment is configured by ribs extending continuously in the tire circumferential direction.

  The crown land portion 14 includes, for example, a first crown sipe 41 extending from the outer crown main groove 4 and interrupted in the crown land portion 14, and a second crown sipe extending from the inner crown main groove 6 and interrupted in the crown land portion 14. 42 is preferably provided.

  It is desirable that the first crown sipe 41 and the second crown sipe 42 are inclined in the same direction, for example. The first crown sipe 41 and the second crown sipe 42 are provided alternately in the tire circumferential direction, for example. Such sipe 41,42 can suppress the partial wear of the crown land part 14 comprised with the rib.

  The enlarged view of the outer side shoulder land part 10 and the outer side middle land part 11 of other embodiment of this invention is shown by FIG. As shown in FIG. 5, in this embodiment, a chamfer 45 is provided in each groove. The chamfer 45 is a surface in which a corner between the tread surface and the groove wall is notched.

  It is desirable that the chamfered portion 45a provided in the outer portion 23 of the outer shoulder lateral groove 15 and the chamfered portion 45b provided in the inner portion 24 each have a gradually increasing width toward the connecting portion 25 side. Such chamfered portions 45 a and 45 b can enhance the drainage of the outer shoulder lateral groove 15.

  As mentioned above, although the tire of one embodiment of the present invention was explained in detail, the present invention is not limited to the above-mentioned specific embodiment, and can be carried out by changing to various modes.

A tire of size 225 / 45R17 having the basic pattern of FIG. 1 was prototyped. As a comparative example, as shown in FIG. 6, a tire in which the first outer middle lug groove extends linearly was manufactured. Each test tire was tested for wet performance and handling stability on dry roads. The common specifications and test methods for each test tire are as follows.
Wearing rim: 17 × 7.5J
Tire internal pressure: 230kPa
Test vehicle: 2000cc displacement, front-wheel drive vehicle Tire mounting position: all wheels

<Wet performance>
The test vehicle traveled on an asphalt road surface with a radius of 100 m provided with a puddle having a depth of 5 mm and a length of 20 m, and the lateral acceleration (lateral G) of the front wheels was measured. The result is an average lateral G at a speed of 50 to 80 km / h, and is indicated by an index with the value of the comparative example being 100. It shows that wet performance is excellent, so that a numerical value is large.

<Operation stability on dry road>
Steering stability when driving on the dry road surface with the test vehicle was evaluated by the driver's sensuality. A result is a score which makes a comparative example 100, and shows that the steering stability on a dry road surface is excellent, so that a numerical value is large.
The test results are shown in Table 1.

  As a result of the test, it was confirmed that the tires of the examples exhibited excellent wet performance. In addition, it was confirmed that the tires of the examples also maintained the steering stability on the dry road surface.

2 tread portion 3 outer shoulder main groove 10 outer shoulder land portion 11 outer middle land portion 15 outer shoulder lateral groove 18 first outer middle lug groove 21 outer portion 22 inner portion To outer tread end

Claims (6)

A tire having a tread portion in which a direction of mounting on a vehicle is specified,
The tread portion has an outer tread end located outside the vehicle when mounted on the vehicle,
The tread portion includes an outer shoulder land portion having the outer tread end, an outer middle land portion adjacent to the outer shoulder land portion, and an outer shoulder main groove extending between them in the tire circumferential direction.
The outer shoulder land portion is provided with a plurality of outer shoulder lateral grooves extending from the outer shoulder main groove to the outer tread end,
The outer middle land portion is provided with a plurality of first outer middle lug grooves extending obliquely from the outer shoulder main groove and terminating in the outer middle land portion,
Each of the first outer middle lug grooves is disposed at a position that is smoothly continuous with any of the outer shoulder lateral grooves via the outer shoulder main groove,
Each of the first outer middle lug grooves includes an outer portion on the outer shoulder main groove side and an inner portion having an angle with respect to the tire circumferential direction smaller than the outer portion.   The tire according to claim 1, wherein the outer shoulder lateral groove includes a bent groove including an outer portion on an outer tread end side and an inner portion bent with respect to the outer portion.   3. The bent groove according to claim 2, wherein the inner portion has a groove width gradually increasing toward the outer tread end side, and the outer portion has a groove width gradually decreasing toward the outer tread end side. tire.   The tire according to claim 2 or 3, wherein the outer shoulder lateral groove has a maximum groove width at a connection portion between the inner portion and the outer portion.   The tire according to any one of claims 2 to 4, wherein a length of the inner portion in the tire axial direction is smaller than a length of the first outer middle lug groove in the tire axial direction. On the side opposite to the outer shoulder main groove of the outer middle land portion, an outer crown main groove is adjacent,
The outer middle land portion is provided with a second outer middle lug groove extending obliquely from the outer crown main groove and terminating in the outer middle land portion,
The tire according to any one of claims 1 to 5, wherein the second outer middle lug groove is inclined in a direction opposite to the first outer middle lug groove.

Images