tire

Abstract

To provide a five-rib tire exerting excellent steering stability while maintaining superior riding comfort.SOLUTION: A tread part 2 of a tire is configured by four circumferential grooves 3 and five land parts 4. The circumferential groove 3 includes two shoulder circumferential grooves 5 and two crown circumferential grooves 6, and the land part 4 includes two shoulder land parts 7, two middle land parts 8 and a crown land part 9. The two middle land parts 8 each comprise a vertical sipe 10, a plurality of first and second middle lateral grooves 11 and 12. The two shoulder land parts 7 each comprise a plurality of plural shoulder lateral grooves 15 extending from a tread end and ending in the shoulder land part 7.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tire. [Background technology]

[0002] Patent Document 1 below proposes a tire whose tread portion is divided into five land portions (hereinafter, may be referred to as a "5-rib tire.") The tire of Patent Document 1 has an improved groove arrangement to improve driving stability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-168356 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, with the increasing performance of vehicles, tires are required to have better driving stability. However, depending on the groove arrangement, the improved driving stability may result in a loss of ride comfort.

[0005] The present invention has been devised in view of the above problems, and has as its main object to provide a 5-rib tire that exhibits excellent steering stability while maintaining ride comfort. [Means for solving the problem]

[0006] The present invention relates to a tire having a tread portion, the tread portion being composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread edges, and five land portions divided by the circumferential grooves, the circumferential grooves including two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portions including two shoulder land portions including the tread ends, two middle land portions divided between the shoulder circumferential groove and the crown circumferential groove, and a land portion between the two crown circumferential grooves. and a crown land portion divided into a crown land portion and a middle land portion, each of the two middle land portions including a longitudinal sipe extending continuously in the tire circumferential direction, a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe, and a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe, and each of the two shoulder land portions including a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion.

[0007] In the tire of the present invention, it is desirable that the tread portion has a specified mounting orientation on a vehicle, the two tread ends consist of an outer tread end that is located on the outer side of the vehicle when mounted on the vehicle, and an inner tread end that is located on the inner side of the vehicle when mounted on the vehicle, the two shoulder land portions consist of an outer shoulder land portion including the outer tread end and an inner shoulder land portion including the inner tread end, and the two middle land portions consist of an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion.

[0008] In the tire of the present invention, it is preferable that the width in the axial direction of the outer shoulder land portion is larger than the width in the axial direction of the outer middle land portion.

[0009] In the tire of the present invention, it is preferable that the axial width of the outer middle land portion is larger than the axial width of the crown land portion.

[0010] In the tire of the present invention, it is preferable that the axial width of the crown land portion is larger than the axial width of the inner middle land portion.

[0011] In the tire of the present invention, it is preferable that the axial width of the inner middle land portion is larger than the axial width of the inner shoulder land portion.

[0012] In the tire of the present invention, the axial width of the outer shoulder land portion is desirably 101% to 107% of the axial width of the crown land portion.

[0013] In the tire of the present invention, the axial width of the inner shoulder land portion is desirably 93% to 99% of the axial width of the crown land portion.

[0014] In the tire of the present invention, it is preferable that the outer shoulder land portion, the outer middle land portion, the crown land portion and the inner middle land portion each have a greater circumferential rigidity than the adjacent land portion on the inner side of the vehicle when mounted on the vehicle.

[0015] In the tire of the present invention, it is preferable that the groove width of the shoulder circumferential groove is smaller than the groove width of the crown circumferential groove.

[0016] In the tire of the present invention, the groove width of the shoulder circumferential groove is desirably 93% to 99% of the groove width of the crown circumferential groove.

[0017] In the tire of the present invention, it is preferable that the crown land portion is provided with a plurality of crown sipes crossing the crown land portion.

[0018] A second aspect of the present invention is a tire having a tread portion, the tread portion being composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread edges and five land portions divided by the circumferential grooves, the circumferential grooves including two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portions being composed of two shoulder land portions including the tread ends, two middle land portions divided between the shoulder circumferential groove and the crown circumferential groove, and the two crown circumferential grooves. and a crown land portion divided between the two middle land portions, each of which includes a longitudinal sipe extending continuously in the tire circumferential direction, a plurality of first middle sipes extending from the crown circumferential groove and ending within the middle land portion without communicating with the longitudinal sipes, and a plurality of second middle sipes extending from the shoulder circumferential groove and ending within the middle land portion without communicating with the longitudinal sipes, and the two shoulder land portions each include a plurality of shoulder lateral grooves extending from the tread end and ending within the shoulder land portion.

[0019] In the tire of the present invention, it is preferable that a first chamfered portion that opens into the ground contact surface of the middle land portion is provided on an outer side in the tire radial direction of the first middle sipe.

[0020] In the tire of the present invention, it is preferable that the first chamfered portion is provided on a sipe edge on both sides of the first middle sipe in the tire circumferential direction.

[0021] In the tire of the present invention, it is preferable that a second chamfered portion that opens into the ground contact surface of the middle land portion is provided on an outer side in the tire radial direction of the second middle sipe.

[0022] In the tire of the present invention, it is preferable that the second chamfered portion is provided on a sipe edge on both sides of the second middle sipe in the tire circumferential direction. Effect of the Invention

[0023] The tire of the present invention has a tread portion that is configured with four circumferential grooves and five land portions divided by the circumferential grooves. The land portions include two shoulder land portions including the tread ends, two middle land portions divided between the shoulder circumferential grooves and the crown circumferential groove, and a crown land portion divided between the two crown circumferential grooves.

[0024] Each of the two middle land portions includes a longitudinal sipe extending continuously in the tire circumferential direction, a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe, and a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe.

[0025] The longitudinal sipes maintain the circumferential rigidity of the middle land portion while moderately reducing the axial rigidity of the tire, improving ride comfort. In addition, the first middle lateral grooves and the second middle lateral grooves are interrupted within the middle land portion without communicating with the longitudinal sipes, thereby improving ride comfort while maintaining the circumferential rigidity of the middle land portion.

[0026] On the other hand, the two middle land portions, which maintain the circumferential rigidity of the tire, also help improve steering stability.

[0027] Furthermore, each of the two shoulder land portions of the present invention includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, thereby achieving excellent steering stability while maintaining ride comfort. [Brief description of the drawings]

[0028] [Figure 1] 1 is a development view of a tread portion of a tire according to one embodiment of the present invention. [Diagram 2] 2 is an enlarged view of an outer middle land portion, an inner middle land portion, and a crown land portion in FIG. 1. [Diagram 3] FIG. 2 is an enlarged view of an outer shoulder land portion and an inner shoulder land portion of FIG. [Figure 4] 3 is a cross-sectional view taken along line AA in FIG. 2. [Diagram 5] FIG. 4 is a development view of a tread portion of a tire according to another embodiment of the present invention. [Figure 6] 6 is an enlarged view of an outer middle land portion, an inner middle land portion, and a crown land portion in FIG. 5. [Figure 7] 7 is a cross-sectional view taken along line BB in FIG. 6. [Figure 8] FIG. 11 is a cross-sectional view of a first middle sipe and a first chamfered portion of another embodiment. [Figure 9] FIG. 4 is an enlarged view of an outer middle land portion, an inner middle land portion, and a crown land portion of a comparative tire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a development view of a tread portion 2 of a tire 1 according to the present embodiment. The tire 1 according to the present embodiment is used, for example, as a pneumatic tire for a passenger vehicle. However, the tire 1 according to the present invention is not limited to such an embodiment.

[0030] 1, a tire 1 of this embodiment has a tread portion 2 in which the mounting direction on a vehicle is specified, for example. The mounting direction on a vehicle is indicated by, for example, letters or marks on a sidewall portion or the like (not shown).

[0031] The tread portion 2 is composed of four circumferential grooves 3 extending continuously in the tire circumferential direction between two tread ends To, Ti, and five land portions 4 separated by the circumferential grooves 3.

[0032] The two tread ends To, Ti include an outer tread end To located on the outer side of the vehicle when mounted on the vehicle, and an inner tread end Ti located on the inner side of the vehicle when mounted on the vehicle.

[0033] In the case of a pneumatic tire, the outer tread edge To and the inner tread edge Ti are the axially outermost contact points when a tire 1 in a normal condition, that is, when mounted on a normal rim, inflated to a normal internal pressure, and unloaded, is placed on the ground with a normal load and a camber angle of 0 degrees. Unless otherwise specified, the dimensions of each part of the tire are values ​​measured in a normal condition.

[0034] A "genuine rim" is a rim that is defined for each tire by the standard system that includes the standard on which the tire is based. For example, in the case of JATMA, it is called a "standard rim," in the case of TRA, it is called a "Design Rim," and in the case of ETRTO, it is called a "Measuring Rim."

[0035] "Normal internal pressure" is the air pressure set for each tire by each standard in the standard system on which the tire is based. In the case of JATMA, it is the "maximum air pressure." In the case of TRA, it is the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES." In the case of ETRTO, it is the "INFLATION PRESSURE."

[0036] "Normal load" is the load that each standard specifies for each tire in the system of standards on which the tire is based. For JATMA, it is "maximum load capacity." For TRA, it is the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES." For ETRTO, it is "LOAD CAPACITY."

[0037] The circumferential groove 3 extends linearly in parallel to the tire circumferential direction with a constant groove width, for example. However, the circumferential groove 3 may extend in a wavy manner or may extend with a groove width that changes periodically.

[0038] The circumferential grooves 3 include two shoulder circumferential grooves 5 and two crown circumferential grooves 6. The shoulder circumferential grooves 5 are provided on each side of the tire equator C. The two crown circumferential grooves 6 are disposed between the two shoulder circumferential grooves 5. In this embodiment, the crown circumferential grooves 6 are provided on each side of the tire equator C.

[0039] The two shoulder circumferential grooves 5 consist of an outer shoulder circumferential groove 5A and an inner shoulder circumferential groove 5B. The outer shoulder circumferential groove 5A is provided between an outer tread edge To and a tire equator C. The inner shoulder circumferential groove 5B is provided between an inner tread edge Ti and a tire equator C.

[0040] The two crown circumferential grooves 6 include an outer crown circumferential groove 6A and an inner crown circumferential groove 6B. The outer crown circumferential groove 6A is provided between the outer shoulder circumferential groove 5A and the tire equator C. The inner crown circumferential groove 6B is provided between the inner shoulder circumferential groove 5B and the tire equator C.

[0041] The axial distance from the tire equator C to the groove center line of the shoulder circumferential groove 5 is preferably, for example, 25% to 35% of the tread width TW. The axial distance from the tire equator C to the groove center line of the crown circumferential groove 6 is preferably, for example, 5% to 15% of the tread width TW. The tread width TW is the axial distance from the outer tread edge To to the inner tread edge Ti in the normal state.

[0042] Each circumferential groove 3 has a groove width greater than at least 1.5 mm, preferably 3.0 mm or more, and more preferably 4.0 mm or more. The groove width of each circumferential groove 3 is preferably, for example, 4.0% to 7.0% of the tread width TW. The groove depth of each circumferential groove is preferably, for example, 5 to 12 mm.

[0043] As a desirable aspect, the groove width W1 of the shoulder circumferential groove 5 in this embodiment is smaller than the groove width W2 of the crown circumferential groove 6. Specifically, the groove width W1 of the shoulder circumferential groove 5 is 93% to 99% of the groove width W2 of the crown circumferential groove 6, and preferably 94% to 98%.

[0044] The land portion 4 includes two shoulder land portions 7 including the outer tread edge To or the inner tread edge Ti, two middle land portions 8 divided between the shoulder circumferential groove 5 and the crown circumferential groove 6, and a crown land portion 9 divided between the two crown circumferential grooves 6. The two shoulder land portions 7 in this embodiment are composed of an outer shoulder land portion 7A including the outer tread edge To and an inner shoulder land portion 7B including the inner tread edge Ti. The two middle land portions 8 are composed of an outer middle land portion 8A and an inner middle land portion 8B. The outer middle land portion 8A is adjacent to the outer shoulder land portion 7A and is divided between the outer shoulder circumferential groove 5A and the outer crown circumferential groove 6A. The inner middle land portion 8B is adjacent to the inner shoulder land portion 7B and is divided between the inner shoulder circumferential groove 5B and the inner crown circumferential groove 6B.

[0045] 2 shows an enlarged view of the outer middle land portion 8A, the inner middle land portion 8B, and the crown land portion 9. As shown in FIG. 2, the outer middle land portion 8A and the inner middle land portion 8B each include a longitudinal sipe 10 extending continuously in the tire circumferential direction, a plurality of first middle lateral grooves 11 extending from the crown circumferential groove 6 and ending in the middle land portion 8 without communicating with the longitudinal sipe 10, and a plurality of second middle lateral grooves 12 extending from the shoulder circumferential groove 5 and ending in the middle land portion 8 without communicating with the longitudinal sipe 10. In this specification, the term "sipe" means a cut having a width of 1.5 mm or less.

[0046] The longitudinal sipes 10 improve ride comfort by appropriately reducing the axial rigidity of the tire while maintaining the circumferential rigidity of the middle land portion 8. In addition, the first middle lateral grooves 11 and the second middle lateral grooves 12 are discontinued within the middle land portion 8 without communicating with the longitudinal sipes 10, thereby improving ride comfort while maintaining the circumferential rigidity of the middle land portion 8.

[0047] On the other hand, the two middle land portions 8, which maintain the circumferential rigidity of the tire, also contribute to improving driving stability. In addition, a tire having the two middle land portions 8 can be expected to generate a relatively large cornering force even when the ground pressure and slip angle are small. For this reason, for example, when the tire of the present invention is mounted on all wheels of a FF vehicle, the rear tires generate sufficient cornering force, which makes it easier to converge the yawing of the vehicle when starting to turn, and provides excellent driving stability.

[0048] An enlarged view of the outer shoulder land portion 7A and the inner shoulder land portion 7B is shown in Fig. 3. As shown in Fig. 3, each of the two shoulder land portions 7 of the present invention includes a plurality of shoulder lateral grooves 15 extending from the outer tread edge To or the inner tread edge Ti and terminated within the shoulder land portion 7, so that the tire can exhibit excellent steering stability while maintaining ride comfort.

[0049] A more detailed configuration of this embodiment will be described below. In the tire 1 of this embodiment, the axial width of each land portion is specified as follows so that the tire 1 exhibits better driving stability when mounted on a FF vehicle.

[0050] As shown in Fig. 1, the axial width W3 of the outer shoulder land portion 7A is larger than the axial width W4 of the outer middle land portion 8A. The axial width W4 of the outer middle land portion 8A is larger than the axial width W5 of the crown land portion 9. The axial width W5 of the crown land portion 9 is larger than the axial width W6 of the inner middle land portion 8B. The axial width W6 of the inner middle land portion 8B is larger than the axial width W7 of the inner shoulder land portion 7B.

[0051] In other words, the inner shoulder land portion 7B has the smallest width among the five land portions, and the outer shoulder land portion 7A, the outer middle land portion 8A, the crown land portion 9 and the inner middle land portion 8B are each set to have a larger axial width in the tire than the adjacent land portions on the inside of the vehicle when mounted on the vehicle.

[0052] When the tire 1 of this embodiment is mounted on all wheels of a FF vehicle, the front tires exert a large cornering force, improving responsiveness to steering, while the rear tires also exert a sufficient cornering force, making it easier to converge the yawing of the vehicle when starting to turn. Therefore, when the tire 1 of this embodiment is mounted on all wheels of a FF vehicle, it can exert better steering stability.

[0053] From the viewpoint of further enhancing the above-mentioned effects, the width W3 of the outer shoulder land portion 7A is preferably 16% or more of the tread width TW. The width W3 of the outer shoulder land portion 7A is preferably 101% to 107% of the width W5 of the crown land portion 9. The width W4 of the outer middle land portion 8A is preferably 101% to 105% of the width W5 of the crown land portion 9. The width W6 of the inner middle land portion 8B is preferably 95% to 99% of the width W5 of the crown land portion 9. The width W7 of the inner shoulder land portion 7B is preferably 93% to 99% of the width W5 of the crown land portion 9. The tire of this embodiment can exert a large cornering force and improve the steering stability whether it is used for the front wheels or the rear wheels of a vehicle.

[0054] As shown in Fig. 2, the longitudinal sipe 10 provided in the middle land portion 8 is preferably provided in the axial center of the middle land portion 8. Such a longitudinal sipe 10 exhibits the above-mentioned effects, and can reduce the impact sound when the middle land portion 8 touches the ground, thereby improving noise performance. The axial distance from the longitudinal edge of the middle land portion 8 on the tire equator C side to the longitudinal sipe 10 is preferably 20% to 80% of the axial width of the middle land portion 8, and more preferably 40% to 60%. As a more preferable aspect, the longitudinal sipe 10 of this embodiment is provided at the axial center of the middle land portion 8.

[0055] The width of the longitudinal sipes 10 is 1.5 mm or less, and preferably 0.6 to 1.2 mm. The depth of the longitudinal sipes 10 is, for example, 1.5 to 4.0 mm. The longitudinal sipes 10 are provided, for example, over 80% to 100% of the entire circumference of the tire.

[0056] The first middle lateral grooves 11 are, for example, inclined with respect to the tire axial direction. In this embodiment, the first middle lateral grooves 11A arranged in the outer middle land portion 8A and the first middle lateral grooves 11B arranged in the inner middle land portion 8B are inclined in the same direction (downward to the right in FIG. 2). The angle θ1 of the first middle lateral grooves 11 with respect to the tire axial direction is, for example, 15 to 30°, and preferably 19 to 25°. Such first middle lateral grooves 11 are useful for improving ride comfort and handling stability in a well-balanced manner.

[0057] The second middle lateral grooves 12A provided in the outer middle land zone 8A are inclined, for example, in the same direction with respect to the tire axial direction as the first middle lateral grooves 11. The angle θ2 of the second middle lateral grooves 12A with respect to the tire axial direction is smaller than the angle θ1 of the first middle lateral grooves 11. The angle θ2 is, for example, 5 to 15°, and preferably 7 to 13°.

[0058] The angle of the second middle lateral grooves 12B in the inner middle land portion 8B with respect to the tire axial direction is, for example, smaller than the angle θ2 of the second middle lateral grooves 12A in the outer middle land portion 8A. The angle of the second middle lateral grooves 12B in the inner middle land portion 8B with respect to the tire axial direction is 10° or less, preferably 5° or less. More preferably, the second middle lateral grooves 12 in this embodiment extend parallel to the tire axial direction.

[0059] The first middle lateral grooves 11 and the second middle lateral grooves 12 have the same circumferential pitch length P1. The circumferential distance L1 between the inner end of the first middle lateral groove 11 on the longitudinal sipe 10 side and the inner end of the second middle lateral groove 12 on the longitudinal sipe 10 side is preferably 10% or less of the circumferential pitch length P1. As a result, the first middle lateral grooves 11 and the second middle lateral grooves 12 effectively reduce the rigidity of the middle land portion 8, improving the ride comfort and reducing the impact sound when the middle land portion 8 touches the ground.

[0060] The axial length L2 of the first middle lateral groove 11 and the axial length L3 of the second middle lateral groove 12 are, for example, 30% to 45% of the axial width of the land portion in which these grooves are provided (i.e., the width W4 of the outer middle land portion 8A or the width W6 of the inner middle land portion 8B).

[0061] The length L2 of the first middle lateral groove 11 and the length L3 of the second middle lateral groove 12 are preferably 6.0 to 11.0 mm, more preferably 9.0 to 10.4 mm. The axial distance L4 from the inner end of the first middle lateral groove 11 or the second middle lateral groove 12 on the longitudinal sipe 10 side to the longitudinal sipe 10 is, for example, 3.0 to 5.0 mm. Such first middle lateral grooves 11 and second middle lateral grooves 12 are useful for improving the steering stability and ride comfort in a well-balanced manner.

[0062] From the same viewpoint, the groove width W8 of the first middle lateral groove 11 and the groove width W9 of the second middle lateral groove 12 are, for example, 3.5 mm or less, and preferably 1.8 to 2.2 mm.

[0063] The inner middle land portion 8B is provided with a plurality of inner middle sipes 18. The inner middle sipes 18 extend from the inner shoulder circumferential groove 5B and terminate within the inner middle land portion 8B without communicating with the longitudinal sipes 10. The inner middle sipes 18 reduce the rigidity of the inner middle land portion 8B and improve ride comfort and noise performance.

[0064] The length L5 of the inner middle sipe 18 in the tire axial direction is, for example, 30% to 45% of the width W6 of the inner middle land portion 8B in the tire axial direction. The length L5 of the inner middle sipe 18 is, for example, 6.0 to 11.0 mm, and preferably 9.0 to 10.4 mm.

[0065] The width of the inner middle sipes 18 is, for example, 0.5 to 1.5 mm, and preferably 0.5 to 0.7 mm. The angle of the inner middle sipes 18 with respect to the tire axial direction is, for example, 0.9 to 1.5°.

[0066] In this embodiment, the inner middle sipes 18 and the second middle lateral grooves 12 are alternately provided in the tire circumferential direction. The distance L6 in the tire circumferential direction between the inner middle sipes 18 and the second middle lateral grooves 12 is, for example, 35% to 50% of one pitch length P2 in the tire circumferential direction of the second middle lateral grooves 12. Such an arrangement of the inner middle sipes 18 can suppress uneven wear of the inner middle land portion 8B while achieving the above-mentioned effects.

[0067] In the outer middle land portion 8A of the present embodiment, no grooves or sipes are provided other than the longitudinal sipes 10, the first middle lateral grooves 11, and the second middle lateral grooves 12. In the inner middle land portion 8B of the present embodiment, no grooves or sipes are provided other than the longitudinal sipes 10, the first middle lateral grooves 11, the second middle lateral grooves 12, and the inner middle sipes 18.

[0068] In the present embodiment, the crown land portion 9 is provided with, for example, a plurality of crown narrow grooves 20. The crown narrow grooves 20 cross the crown land portion 9. In addition, the crown narrow grooves 20 are provided at the same pitch as the first middle lateral grooves 11.

[0069] The circumferential distance L7 between the end of the crown narrow groove 20 and the end of the first middle lateral groove 11 on the tire equator C side is, for example, 10% or less of one pitch length P1 of the first middle lateral groove 11 in the tire circumferential direction. In a preferred embodiment, the end of the crown narrow groove 20 overlaps with an area obtained by extending the end of the first middle lateral groove 11 in parallel to the tire axial direction. In this embodiment, the above-mentioned relationship is established between the first middle lateral groove 11A provided in the outer middle land portion 8A and the crown narrow groove 20, and between the first middle lateral groove 11B provided in the inner middle land portion 8B and the crown narrow groove 20. As a result, each land portion works together to provide a cornering force, improving the linearity of steering.

[0070] The angle of the crown narrow groove 20 with respect to the tire axial direction is, for example, 5 to 15°, and preferably 8 to 14°. The crown narrow groove 20 of this embodiment is curved convexly to one side in the tire circumferential direction (downward in FIG. 2) by smoothly changing the angle with respect to the tire axial direction.

[0071] Fig. 4 shows a cross-sectional view of the crown narrow groove 20 taken along line AA in Fig. 2. As shown in Fig. 4, the crown narrow groove 20 includes an opening 21 having an opening width W10 of 1.6 to 2.8 mm on the tread surface, for example, and a sipe portion 22 continuing to the bottom of the opening 21. The width W11 of the sipe portion 22 is, for example, 0.5 to 1.5 mm. Such a crown narrow groove 20 is useful for improving the steering stability and ride comfort in a well-balanced manner.

[0072] From the same viewpoint, the depth d1 of the crown narrow groove 20 is, for example, not more than 5.0 mm, and preferably 1.5 to 3.5 mm.

[0073] 2, the crown land portion 9 is not provided with any grooves or sipes other than the above-mentioned crown narrow groove 20. This ensures the rigidity of the crown land portion 9, and improves the driving stability.

[0074] As shown in Fig. 3, the shoulder lateral grooves 15 are inclined with respect to the tire axial direction, for example. In this embodiment, the shoulder lateral grooves 15 are inclined in the opposite direction to the first middle lateral grooves 11 (shown in Fig. 2) with respect to the tire axial direction. The angle θ3 of the shoulder lateral grooves 15 with respect to the tire axial direction is, for example, 10 to 30°. Such shoulder lateral grooves 15 provide frictional force in a direction different from that of the first middle lateral grooves 11 by their edges, which helps to improve driving stability.

[0075] The groove width W12 of the shoulder lateral groove 15 is, for example, 2.0 to 8.0 mm. The axial length L8 of the shoulder lateral groove 15 is, for example, 50% to 80% of the axial width of the land portion in which the shoulder lateral groove 15 is provided (i.e., the width W3 of the outer shoulder land portion 7A or the width W7 of the inner shoulder land portion 7B).

[0076] The axial distance L9 from the inner end of the shoulder lateral groove 15 to the shoulder circumferential groove 5 is, for example, 5 to 25 mm, and preferably 12 to 20 mm. The distance L9 is preferably greater than the axial distance between the first middle lateral groove 11 and the second middle lateral groove 12 (shown in FIG. 2). This ensures sufficient rigidity of the shoulder land portion 7.

[0077] As a more preferable embodiment, the axial length of the shoulder lateral groove 15B provided in the inner shoulder land portion 7B is shorter than the axial length of the shoulder lateral groove 15A provided in the outer shoulder land portion 7A. This ensures rigidity near the inner tread edge Ti, and further improves steering stability.

[0078] The shoulder land portion 7 is provided with, for example, a plurality of shoulder sipes 25. The shoulder sipes 25 cross the shoulder land portion 7. In this embodiment, the shoulder sipes 25 and the shoulder lateral grooves 15 are provided alternately in the tire circumferential direction. The width of the shoulder sipes 25 is, for example, 0.6 to 1.2 mm.

[0079] 1, the circumferential distance between the end of the shoulder circumferential groove 5 side of the shoulder sipe 25A provided in the outer shoulder land portion 7A and the end of the second middle lateral groove 12A on the shoulder circumferential groove 5 side is preferably 10% or less of one circumferential pitch length of the second middle lateral groove 12. This allows the land portions to work together to provide a cornering force, improving steering linearity.

[0080] From a similar viewpoint, it is desirable that the circumferential distance between the end of the shoulder circumferential groove 5 side of the shoulder sipe 25B provided in the inner shoulder land portion 7B and the end of the shoulder circumferential groove 5 side of the inner middle sipe 18 be 10% or less of one circumferential pitch length of the inner middle sipe 18.

[0081] The shoulder land portion 7 is not provided with any grooves or sipes other than the above-mentioned shoulder lateral grooves 15 and shoulder sipes 25.

[0082] In this embodiment, the grooves and sipes are arranged in each land portion, so that the outer shoulder land portion 7A, the outer middle land portion 8A, the crown land portion 9, and the inner middle land portion 8B have a higher circumferential rigidity than the adjacent land portion on the inside of the vehicle when mounted on the vehicle. The tire 1 having such a rigidity distribution can exert a large cornering force and improve the linearity of steering.

[0083] Fig. 5 shows a development view of a tread portion 2 of a tire 1 according to another embodiment of the present invention. Fig. 6 shows an enlarged view of an outer middle land portion 8A, an inner middle land portion 8B, and a crown land portion 9 shown in Fig. 5. Note that, for configurations not specifically described in this embodiment, the configurations of the embodiments shown in Figs. 1 to 4 can be applied.

[0084] As shown in FIG. 5 and FIG. 6, in this embodiment, the two middle land portions 8 (the outer middle land portion 8A and the inner middle land portion 8B) each include a plurality of first middle sipes 31 extending from the crown circumferential groove 6 and ending in the middle land portion 8 without communicating with the longitudinal sipes 10, and a plurality of second middle sipes 32 extending from the shoulder circumferential groove 5 and ending in the middle land portion 8 without communicating with the longitudinal sipes 10. Such first middle sipes 31 and second middle sipes 32 can maintain the rigidity of the middle land portion 8 and further improve the steering stability. The first middle sipes 31 can be applied to the configuration of the first middle lateral grooves 11 described above with respect to the configuration in the tread plan view (e.g., length, angle, and pitch). Similarly, the second middle sipes 32 can be applied to the configuration in the tread plan view with respect to the configuration of the second middle lateral grooves 12 described above.

[0085] FIG. 7 shows a cross-sectional view of line BB in FIG. 6. As shown in FIG. 7, a first chamfered portion 33 that opens on the ground contact surface of the middle land portion 8 is provided on the radially outer side of the first middle sipe 31. The first chamfered portion 33 opens with a width larger than that of the first middle sipe 31. In a more preferable embodiment, the first chamfered portion 33 is provided on the sipe edges on both sides of the first middle sipe 31 in the tire circumferential direction. Such a first chamfered portion 33 can suppress distortion of the ground contact surface of the middle land portion 8 and suppress uneven wear thereof. However, the present invention is not limited to such an embodiment, and for example, the first middle sipe 31 may extend from its bottom to the ground contact surface of the middle land portion 8 with a constant width.

[0086] An opening width W14 of the first chamfered portion 33 is, for example, 3.0 to 4.5 times the width W13 of the first middle sipe 31. A depth d4 of the first chamfered portion 33 is, for example, 30% or less of a total depth d3 from the ground contact surface of the middle land portion 8 to the bottom of the first middle sipe 31, and is preferably 15% to 25%.

[0087] The first chamfered portion 33 includes, for example, an inclined surface 35 that continues to the ground contact surface of the middle land portion 8. The inclined surface 35 is inclined at an angle of, for example, 10 to 45° with respect to a normal line that passes through the opening edge of the first chamfered portion 33 and is perpendicular to the ground contact surface of the middle land portion 8.

[0088] Similarly, as shown in Fig. 6, a second chamfered portion 34 that opens at the contact surface of the middle land portion 8 is provided on the radially outer side of the second middle sipe 32. The second chamfered portion 34 is preferably provided on the sipe edges on both sides in the circumferential direction of the tire of the second middle sipe 32. The configuration of the above-mentioned first chamfered portion 33 shown in Fig. 7 can be applied to the second chamfered portion 34.

[0089] Fig. 8 shows yet another embodiment of the first chamfered portion 33. As shown in Fig. 8, the first chamfered portion 33 may be provided only on one sipe edge of the first middle sipe 31 in the tire circumferential direction. Such a first chamfered portion 33 can suppress distortion of the ground contact surface while maintaining the rigidity of the middle land portion 8. The embodiment shown in Fig. 8 can also be applied to the second middle sipe 32 and the second chamfered portion 34.

[0090] Although the tire according to one embodiment of the present invention has been described in detail above, the present invention is not limited to the above specific embodiment and can be modified and carried out in various aspects. EXAMPLES

[0091] A tire having a size of 205 / 55R16 and the basic tread pattern of FIG. 1 was prototyped based on the specifications of Tables 1-2. As a comparative example, a tire having an outer middle land portion a and an inner middle land portion b shown in FIG. 9 was prototyped. The outer middle land portion a and the inner middle land portion b of the comparative example are each provided with a plurality of lateral grooves c crossing these land portions, and are not provided with longitudinal sipes extending continuously in the tire circumferential direction. The comparative example tire has substantially the same pattern as that shown in FIG. 1, except for the above-mentioned configuration. Each test tire was tested for steering stability, ride comfort, and noise performance. The common specifications and test methods of each test tire are as follows. Rim: 16×6.5JJ Tire pressure: 220kPa Test vehicle: 1500cc, front-wheel drive Tire mounting position: All wheels

[0092] <Handling stability> The driving stability of the test vehicle when it was driven on a dry road surface was evaluated by the driver. The results are expressed as a score based on the comparative example being 100, with a higher score indicating better driving stability.

[0093] <Ride comfort> The test vehicle was used to evaluate the ride comfort when traveling on a dry road surface by the driver. The results are given as a score based on the comparative example being 100, with a higher score indicating a better ride comfort.

[0094] <Noise performance> The test vehicle was driven on a dry road surface at 40 to 100 km / h, and the maximum sound pressure of noise inside the vehicle was measured. The results are expressed as an index with the sound pressure of the comparative example being 100, and the smaller the value, the smaller the noise during driving and the more excellent the noise performance. The test results are shown in Tables 1-2.

[0095] [Table 1]

[0096] [Table 2]

[0097] As a result of the test, it was confirmed that the tire of the embodiment exhibited excellent driving stability while maintaining ride comfort. It was also confirmed that the tire of the embodiment exhibited excellent noise performance.

[0098] A tire having a middle land portion as shown in FIG. 6 was prototyped based on the specifications in Table 3, and the same tests as described above were carried out. The results of the tests are shown in Table 3.

[0099] [Table 3]

[0100] As a result of the test, it was confirmed that the tires of the examples shown in Table 3 also exhibited excellent steering stability while maintaining ride comfort. It was also confirmed that the tires of the above examples exhibited excellent noise performance. [Explanation of symbols]

[0101] 2 Tread section 3 Circumferential groove 4 Land 5 Shoulder circumferential groove 6 Crown circumferential groove 7 Shoulder Land Section 8 Middle Land Section 9 Crown Land Division 10 Vertical sipes 11 First Middle Yokomizo 12 Second Middle Yokomizo 15 Shoulder groove

Claims

1. A tire having a tread portion with a specified mounting orientation on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the crown land portion in the tire axial direction is larger than the width of the inner middle land portion in the tire axial direction. tire.

2. A tire having a tread portion with a specified mounting orientation on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the inner middle land portion in the tire axial direction is larger than the width of the inner shoulder land portion in the tire axial direction. tire.

3. A tire having a tread portion with a specified mounting orientation on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the outer shoulder land portion in the tire axial direction is 101% to 107% of the width of the crown land portion in the tire axial direction. tire.

4. A tire having a tread portion with a specified mounting orientation on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the inner shoulder land portion in the tire axial direction is 93% to 99% of the width of the crown land portion in the tire axial direction. tire.

5. A tire as described in any one of claims 1 to 4, wherein the axial width of the outer shoulder land portion is greater than the axial width of the outer middle land portion.

6. A tire as described in any one of claims 1 to 5, wherein the axial width of the outer middle land portion is greater than the axial width of the crown land portion.

7. A tire as described in any one of claims 1 to 6, wherein the outer shoulder land portion, the outer middle land portion, the crown land portion and the inner middle land portion each have greater circumferential rigidity in the tire when mounted on a vehicle than the adjacent land portion on the inside of the vehicle.

8. A tire having a tread portion, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle lateral grooves extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; a plurality of second middle lateral grooves extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipe; Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The crown land portion is provided with a plurality of crown sipes crossing the crown land portion. tire.

9. A tire as described in any one of claims 1 to 8, wherein the groove width of the shoulder circumferential groove is smaller than the groove width of the crown circumferential groove.

10. A tire as described in any one of claims 1 to 9, wherein the groove width of the shoulder circumferential groove is 93% to 99% of the groove width of the crown circumferential groove.

11. A tire having a tread portion with a specified mounting orientation on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle sipes extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes; a plurality of second middle sipes extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes, Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the crown land portion in the tire axial direction is larger than the width of the inner middle land portion in the tire axial direction. tire.

12. A tire having a tread portion with a specified orientation for mounting on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle sipes extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes; a plurality of second middle sipes extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes, Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the inner middle land portion in the tire axial direction is larger than the width of the inner shoulder land portion in the tire axial direction. tire.

13. A tire having a tread portion with a specified orientation for mounting on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle sipes extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes; a plurality of second middle sipes extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes, Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the outer shoulder land portion in the tire axial direction is 101% to 107% of the width of the crown land portion in the tire axial direction. tire.

14. A tire having a tread portion with a specified orientation for mounting on a vehicle, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, The two tread ends include an outer tread end located on the outer side of the vehicle when the tire is mounted on the vehicle, and an inner tread end located on the inner side of the vehicle when the tire is mounted on the vehicle, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two shoulder land portions include an outer shoulder land portion including the outer tread edge and an inner shoulder land portion including the inner tread edge, the two middle land portions include an outer middle land portion adjacent to the outer shoulder land portion and an inner middle land portion adjacent to the inner shoulder land portion, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle sipes extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes; a plurality of second middle sipes extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes, Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The width of the inner shoulder land portion in the tire axial direction is 93% to 99% of the width of the crown land portion in the tire axial direction. tire.

15. A tire having a tread portion, The tread portion is composed of four circumferential grooves extending continuously in the tire circumferential direction between two tread ends and five land portions divided by the circumferential grooves, the circumferential groove includes two shoulder circumferential grooves and two crown circumferential grooves disposed between the two shoulder circumferential grooves, the land portion includes two shoulder land portions including the tread ends, two middle land portions partitioned between the shoulder circumferential groove and the crown circumferential groove, and a crown land portion partitioned between the two crown circumferential grooves, The two middle land portions each have: A longitudinal sipe extending continuously in the tire circumferential direction; a plurality of first middle sipes extending from the crown circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes; a plurality of second middle sipes extending from the shoulder circumferential groove and terminated within the middle land portion without communicating with the longitudinal sipes, Each of the two shoulder land portions includes a plurality of shoulder lateral grooves extending from the tread edge and terminated within the shoulder land portion, The crown land portion is provided with a plurality of crown sipes crossing the crown land portion. tire.

16. A tire as described in any of claims 11 to 15, wherein a first chamfered portion that opens at the contact surface of the middle land portion is provided on the radially outer side of the first middle sipe.

17. The tire as described in claim 16, wherein the first chamfered portion is provided on a sipe edge on both sides of the first middle sipe in the tire circumferential direction.

18. A tire as described in any of claims 11 to 17, wherein a second chamfered portion that opens at the contact surface of the middle land portion is provided on the radially outer side of the second middle sipe.

19. A tire as described in claim 18, wherein the second chamfered portion is provided on a sipe edge on both sides of the second middle sipe in the tire circumferential direction.

Images