JP2011102080A - Tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire capable of restraining stone trapping such as a pebble, while reducing tire noise, when a resonator including a longitudinal groove and a peripheral groove is arranged. <P>SOLUTION: This pneumatic tire 10 is provided with a plurality of rib-like land parts 110 and 120 partitioned by peripheral directional grooves 11, 12 and 13, a resonator R1 and a resonator R2 forming a predetermined space by recessing inward in the tire radial direction and grounding the rib-like land parts 110 and 120 on a road surface. The resonator R1 and the resonator R2 include a peripheral groove 152 and a peripheral groove 156 communicating with a longitudinal groove 154, a longitudinal groove 158 and a peripheral directional groove 12. A groove width of the longitudinal groove 154 sand the longitudinal groove 158 changes along the tire peripheral direction TC, and expands toward the road surface side along the tire radial direction. The groove depth of the longitudinal groove 154 and the longitudinal groove 158 changes along the tire peripheral direction TC, In the deepest part deepest in the groove depth, the groove width is widest, and in the shallowest part shallowest in the groove depth, the groove depth is narrowest. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a plurality of rib-like land portions defined by a plurality of circumferential grooves extending along the tire circumferential direction, recessed toward the inner side in the tire radial direction, and the rib-like land portions are brought into contact with the road surface to obtain a predetermined The present invention relates to a tire provided with a resonator that forms a space and communicates with a circumferential groove.

  Conventionally, in a tire mounted on a passenger car or the like, various methods of reducing air column resonance noise caused by a space formed by a circumferential groove extending along the tire circumferential direction and a road surface have been realized. For example, a tire is known in which a resonator is provided in a rib-like land portion extending along the tire circumferential direction. Such a resonator includes a longitudinal groove extending along the tire circumferential direction, and a lateral groove communicating with the longitudinal groove and the circumferential groove and extending along the tread width direction.

  In such a tire, a so-called “stone biting” in which stones are sandwiched between vertical grooves and circumferential grooves during traveling occurs, and tire noise increases when the sandwiched stones come into contact with the road surface. Therefore, in order to suppress the occurrence of stone biting, a method of forming protrusions in a predetermined space formed between the road surface, for example, the bottom of a longitudinal groove or the bottom of a circumferential groove is widely known ( For example, Patent Document 1).

Japanese Patent Laid-Open No. 2008-296795 (page 3-4, FIGS. 1, 3)

  By the way, in recent years, in automobiles and the like, vehicle noise (wind noise, mechanical noise, etc.) has been further reduced, and the demand for reducing tire noise has been increasing.

  However, the tire described above has the following problems. That is, the volume of the circumferential groove in which the protrusion for preventing is formed is smaller than the volume of the circumferential groove in which the protrusion is not formed. For this reason, there is a problem that the effect of reducing the air columnar resonance noise is lower than that of a resonator without protrusions.

  In addition, when the above-described tire is worn, there is a problem that tire noise generated due to the protrusions coming into contact with the road surface is generated. That is, in the case of the tire having the protrusions described above, there is still room for improvement in order to reduce the tire noise even if the stone biting can be effectively reduced.

  In view of the above, an object of the present invention is to provide a tire capable of suppressing biting of stones such as pebbles while reducing tire noise when a resonator including longitudinal grooves, lateral grooves, and the like is provided.

  In order to solve the above-described problems, the present invention has the following features. First, the first feature of the present invention is that a plurality of rib-shaped land portions (for example, for example, a plurality of circumferential grooves (for example, the circumferential grooves 11) extending along the tire circumferential direction (tire circumferential direction TC). A rib-shaped land portion 110) and a resonator that is recessed toward the inside in the tire radial direction, and that the rib-shaped land portion contacts the road surface (road surface RS) to form a predetermined space and communicates with the circumferential groove ( For example, a resonator R1) is provided, and a plurality of the resonators are provided along the tire circumferential direction and extend along the tire circumferential direction (for example, the vertical groove 154), and the vertical grooves and the circumferential A tire (pneumatic tire 10) including a lateral groove (for example, the lateral groove 152) that communicates with the directional groove and extends along the tread width direction (tread width direction TW), and extends along the tread width direction of the longitudinal groove The groove width (groove width W) is the tire circumference The groove depth (groove depth D) along the tire radial direction (tire radial direction TD) of the longitudinal groove is changed along the tire radial direction and spreads toward the road surface side along the tire radial direction. In the deepest portion (end portion 160b) that changes along the tire circumferential direction and the groove depth is the deepest, the groove width is the widest and in the shallowest portion (end portion 160a) where the groove depth is the shallowest, The gist of the groove is the narrowest.

  According to such a tire, the groove width changes along the tire circumferential direction, and becomes the widest at the deepest portion where the groove depth is deepest. For this reason, when a stone is caught in the vertical groove during traveling, the stone moves to a deeper groove, that is, a wider groove as the tire rotates. Furthermore, since the groove width increases as it goes to the road surface side along the tire radial direction, the stones sandwiched between the vertical grooves are likely to come off the vertical grooves as the tire rotates.

  In addition, a resonator including a lateral groove and a longitudinal groove is provided, and since a projection or the like is not formed on the side wall forming the longitudinal groove, tire noise can be reduced as compared with a groove having a projection on the side wall. . Therefore, it is possible to provide a tire that can suppress biting of pebbles and the like while reducing tire noise.

  A second feature of the present invention relates to the first feature of the present invention, and is summarized in that the lateral groove is connected to an end portion on a kicking side along a tire circumferential direction of the longitudinal groove.

  A third feature of the present invention relates to the first or second feature of the present invention, in a cross section along the tread width direction and the tire radial direction, a line along the side wall of the rib-like land portion, and a tire radial direction. In summary, the angle formed by the line along the line increases from the shallowest part to the deepest part.

  A fourth feature of the present invention relates to any one of the first to third features of the present invention, wherein in the cross section along the tire circumferential direction and the tire radial direction, the vertical groove extends from the shallowest portion to the deepest portion. The gist is to incline over the part.

  According to the characteristics of the present invention, when a resonator including vertical grooves, horizontal grooves, and the like is provided, it is possible to provide a tire that can suppress biting of stones such as pebbles while reducing tire noise.

FIG. 1 is a partial development view of a tread pattern of a pneumatic tire 10 according to an embodiment of the present invention. FIG. 2 is a diagram showing the shape of the resonator R1 when viewed in the tread width direction according to the embodiment of the present invention. FIG. 3 is a partial development view of the rib-like land portion 110 of the pneumatic tire 10 according to the embodiment of the present invention. FIG. 4 shows a cross-sectional shape along the tire radial direction TD and the tread width direction TW of the longitudinal groove 154 of the rib-like land portion 110 according to the embodiment of the present invention. (A) shows the AA cross section in FIG. (B) shows the BB cross section in FIG. FIG. 5 is a partial development view of a tire according to a modification of the embodiment of the present invention.

  Next, an embodiment of a tire according to the present invention will be described with reference to the drawings. Specifically, (1) overall schematic configuration of tire, (2) shape of rib-like land portion 110, (3) cross-sectional shape of longitudinal groove 154, (4) modification, (5) comparative evaluation, (6) Actions and effects, and (7) other embodiments will be described.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(1) Overall Schematic Configuration of Tire FIG. 1 is a partial development view of a tread pattern of a pneumatic tire 10 according to an embodiment of the present invention. Specifically, it is a partial development view of a tread pattern on the ground contact surface G of the pneumatic tire 10. The pneumatic tire 10 is a tire that is designed to reduce tire noise such as air columnar resonance and is mounted on a passenger car or the like that requires high silence. The pneumatic tire 10 may be filled with an inert gas such as nitrogen gas instead of air.

  A plurality of circumferential grooves are formed in the pneumatic tire 10. Specifically, circumferential grooves 11, 12 and 13 are formed in the pneumatic tire 10. The circumferential grooves 11, 12, and 13 extend along the tire circumferential direction TC. Further, the pneumatic tire 10 is provided with a plurality of rib-like land portions 110 and rib-like land portions 120 partitioned by the circumferential grooves 11, 12, and 13.

  Specifically, the rib-like land portion 110 is provided adjacent to the circumferential groove 11 and the circumferential groove 12 between the circumferential groove 11 and the circumferential groove 12. The rib-shaped land portion 120 is provided adjacent to the circumferential groove 12 and the circumferential groove 13 between the circumferential groove 12 and the circumferential groove 13. The rib-like land portion 110 and the rib-like land portion 120 extend along the tire circumferential direction TC. The rib-like land portion 110 and the rib-like land portion 120 are provided on the inner side and the outer side, respectively, when the pneumatic tire 10 is mounted on the vehicle with reference to the tire equator line CL.

  The pneumatic tire 10 is provided with a resonator that is recessed toward the inside in the tire radial direction and that forms a predetermined space when the rib-like land portion contacts the road surface. Specifically, the rib-shaped land portion 110 is provided with a resonator R1. The rib-like land portion 120 is provided with a resonator R2. The resonator R1 includes a lateral groove 152 and a longitudinal groove 154. The resonator R <b> 2 includes a lateral groove 156 and a longitudinal groove 158.

(2) Shape of Rib Land 110 Next, the shape of the rib land 110 will be described with reference to FIGS. The rib-shaped land portion 120 and the resonator R2 are the same except that they are mounted on the opposite side of the rib-shaped land portion 110 with respect to the tire equator line CL, and thus detailed description thereof is omitted.

  FIG. 2 is a diagram showing the shape of the resonator R1 when viewed in the tread width direction according to the embodiment of the present invention. The shape of the resonator R1 formed by the rib-like land portion 110 of the pneumatic tire 10 and the road surface RS is shown. FIG. 3 is a partial development view of the rib-like land portion 110 of the pneumatic tire 10 according to the embodiment of the present invention.

  The resonator R1 includes a rib-shaped land portion 110 that is recessed toward the inner side in the tire radial direction when the rib-shaped land portion 110 contacts the road surface RS in a state where a normal load is applied to the pneumatic tire 10, and the road surface RS. And a predetermined space formed by A plurality of resonators R1 are provided along the tire circumferential direction TC.

  The longitudinal groove 154 extends along the tire circumferential direction TC. The lateral groove 152 communicates with one end of the longitudinal groove 154 and the circumferential groove 12 and extends along the tread width direction TW. The lateral groove 152 continues to the end portion on the kicking side along the tire circumferential direction TC of the longitudinal groove 154. The width of the lateral groove 152 along the tire circumferential direction TC is narrower than the groove width W of the vertical groove 154 along the tread width direction TW. For example, the width along the tire circumferential direction TC of the lateral groove 152 is 0.5 mm to 1.1 mm. The length of the lateral groove 152 along the tread width direction TW is 3 mm to 20 mm. Similarly, the width along the tire circumferential direction TC of the longitudinal groove 154 is 2 mm to 10 mm. The length of the vertical groove 154 along the tread width direction TW is 5 mm to 60 mm.

  As shown in FIG. 2 and FIG. 3, the groove depth along the tire radial direction TD of the longitudinal groove 154 with respect to the ground contact surface where the rib-shaped land portion 110 contacts the road surface RS is along the tire circumferential direction TC. Change. The shallowest portion of the longitudinal groove 154 is located on the stepping side along the tire circumferential direction TC of the longitudinal groove 154, and the deepest portion of the longitudinal groove 154 is located on the kicking side along the tire circumferential direction TC of the longitudinal groove 154. To do. Specifically, the groove depth is deepest at the kick-out side end portion 160b that is one end of the longitudinal groove 154 in the tire circumferential direction TC, and is shallowest at the tread side end portion 160a that is the other end of the longitudinal groove 154. . That is, in the present embodiment, the end 160a is the shallowest portion (depth D1) having the shallowest groove depth. Further, the end 160b is the deepest portion (depth D2) having the deepest groove depth.

  The bottom surface 160 of the longitudinal groove 154 is linear in a cross-sectional view along the tire circumferential direction TC and the tire radial direction TD. In the cross section along the tire circumferential direction TC and the tire radial direction TD, the longitudinal groove 154 is inclined from the shallowest part to the deepest part. Specifically, the vertical groove 154 is inclined from the end 160a to the end 160b.

(3) Cross-sectional shape of longitudinal groove 154 Next, the longitudinal groove 154 of the rib-like land portion 110 will be described with reference to FIGS. 3 and 4.

  FIG. 4 shows the cross-sectional shape of the longitudinal groove 154 of the rib-like land portion 110 along the tire radial direction TD and the tread width direction TW. Specifically, FIG. 4A shows an AA cross section in FIG. FIG.4 (b) shows the BB cross section in FIG.

  The groove width W along the tread width direction TW of the vertical groove 154 changes along the tire circumferential direction TC. Specifically, as shown in FIG. 4A, the groove width W1, which is the groove width on the road surface RS side, is the narrowest at the end 160a. Further, as shown in FIG. 4B, the groove width W2, which is the groove width on the road surface RS side, is the widest at the kicking-side end portion 160b along the tire circumferential direction TC. Further, the groove width W3 which is the groove width of the bottom surface 160 is the narrowest at the end portion 160a. As shown in FIG. 4B, the groove width W4, which is the groove width of the bottom surface 160, is the widest at the end 160b.

  Further, the groove width increases as it goes to the road surface RS side along the tire radial direction TD. For example, the groove width W1 at the end 160a is wider than the groove width W3 of the bottom surface 160. Similarly, the groove width W2 at the end 160b is wider than the groove width W4 of the bottom surface 160.

  When the internal pressure of the pneumatic tire 10 is set to 80% of the maximum internal pressure defined by JATMA, the groove depth D1 of the end 160a in the cross section along the tread width direction TW and the tire radial direction TD. Is the shallowest in the longitudinal groove 154, and is set to 2 mm to 7 mm, for example. The groove depth D2 at the similar end 160b is deepest in the vertical groove 154, and is set to 3 mm to 8 mm, for example.

  In the cross section along the tread width direction TW and the tire radial direction TD, the angle θ formed by the line along the side wall 162 of the rib-like land portion 110 and the line along the tire radial direction TD is the shallowest part ( It becomes larger as it goes from the end 160a to the deepest part (end 160b). Specifically, the angle θ increases as it goes from the end portion 160a to the end portion 160b. The angle θ2 at the end portion 160b is larger than the angle θ1 at the end portion 160a. For example, the angle θ1 is set to 0 degrees to 10 degrees. The angle θ2 is set to 10 degrees to 30 degrees.

(4) Modification In the embodiment described above, the rib-like land portion 110 is provided with the resonator R1 that is a resonator. In the modification, a rib-like land portion 110 provided with a resonator different from the resonator R1 will be described. Note that, in the following modifications, differences from the embodiment will be mainly described, and redundant description will be omitted.

(4.1) Modification 1
FIG. 5 is a partial development view of a tire according to a modification of the embodiment of the present invention. Specifically, FIG. 5 is a front view of a rib-like land portion 110 according to a modification of the embodiment of the present invention. In the embodiment of the present invention, the longitudinal groove 154 of the resonator R1 extends along the tire circumferential direction TC, and the lateral groove 152 extends along the tread width direction TW in the tread surface view. For example, as shown in FIG. 5A, the resonator R1A includes a lateral groove 152A extending obliquely along the tread width direction and a tire circumferential direction. The longitudinal groove 154A may be provided, and the connecting portion between the lateral groove 152A and the longitudinal groove 154A may be curved.

(4.2) Modification 2
As shown in FIG. 5B, the resonator R1B may be formed by a lateral groove 152B extending obliquely along the tread width direction TW and a vertical groove 154B extending along the tire circumferential direction TC.

(4.3) Modification 3
As shown in FIG. 5C, the resonator R1C is located at a position other than the end of the longitudinal groove 154C, the lateral groove 152C extending obliquely along the tread width direction TW, the longitudinal groove 154C extending along the tire circumferential direction. It may include a lateral groove 156C.

(5) Comparative Evaluation Next, a test method for comparative evaluation between the pneumatic tire according to the example having the pattern similar to the pneumatic tire 10 described above and the pneumatic tire according to the comparative example and the result thereof will be described.

(5.1) Test Method Using a test vehicle, the stone biting evaluation and the block rigidity evaluation of the pneumatic tires according to Examples and Comparative Examples were performed. The test conditions for the comparative evaluation are as follows.

・ Test vehicle: Sedan type passenger car (Japanese car)
・ Used tire size: 215 / 55R17
・ Rim size used: Standard rim described in ETRTO ・ Set internal pressure: Standard internal pressure described in ETRTO ・ Set load: Maximum load described in ETRTO (maximum load capacity)
・ Running speed: 20km / h
The pneumatic tire according to the comparative example is formed by a groove width along the tread width direction, a groove depth along the tire radial direction, a line along the side wall of the rib-like land portion, and a line along the tire radial direction. It is the same as the pneumatic tire 10 except that the angles are the same. The pneumatic tire according to the first embodiment is the same as the pneumatic tire 10.

  Evaluation of stone bite: Each pneumatic tire was mounted on a rim, and after adjusting the air pressure and set load, the vehicle traveled 1 km on a gravel road with many pebbles, and the number of stone bites was confirmed.

(5.2) Test Results As shown in Table 1, the number of stone biting of the pneumatic tire according to the example was lower than the number of stone biting of the pneumatic tire according to the comparative example.

Moreover, the rigidity of the block of the pneumatic tire which concerns on an Example improved 2 to 10% in the whole block rather than the block rigidity of the pneumatic tire which concerns on a comparative example. In particular, the block stiffness in the maximum depth region of the pneumatic tire according to the example was improved by 5 to 20% as compared with the block stiffness in the maximum depth region of the pneumatic tire according to the comparative example.

(6) Action / Effect According to the pneumatic tire 10, the groove width W changes along the tire circumferential direction TC, and becomes the widest at the deepest deepest part of the groove depth D. For this reason, when a stone is caught in the longitudinal groove 154 during traveling, the stone moves to the deeper groove depth D, that is, the wider groove width W as the tire rotates. Furthermore, since the groove width W increases along the tire radial direction TD toward the road surface RS, the stones sandwiched between the vertical grooves 154 are easily detached from the vertical grooves 154 as the tire rotates.

  In addition, the resonator R1 including the lateral groove 152 and the vertical groove 154 is provided, and the side wall 162 that forms the vertical groove 154 is not formed with a protrusion or the like. Tire noise can be reduced. Therefore, it is possible to provide the pneumatic tire 10 that can suppress biting of stones and the like while reducing tire noise.

  When traveling on a wet road surface, the water flowing through the longitudinal groove 154 flows from the stepping side to the kicking side. In the present embodiment, the lateral groove 152 continues to the kick-out side end 160b of the longitudinal groove 154 along the tire circumferential direction TC. For this reason, the water flowing through the longitudinal groove 154 flows into the lateral groove 152 at the end 160 b on the kick-out side and reaches the circumferential groove 12. That is, drainage can be improved.

Normally, the cross-sectional area of the longitudinal groove 154 along the tire circumferential direction TC and the tire radial direction TD increases from the shallowest part to the deepest part, and the rib-like land part 110 that forms the side wall 162 of the longitudinal groove 154. The rigidity of is reduced. In the present embodiment, the angle θ increases from the shallowest part (end part 160a) to the deepest part (end part 160b). For this reason, the load applied to the rib-like land portion 110 forming the side wall 162 of the vertical groove 154 is reduced as it goes to the end portion 160b. That is, it is possible to compensate for a decrease in the rigidity of the rib-like land portion 110 that is caused by going from the shallowest portion to the deepest portion. Thereby, the fall of steering stability accompanying the fall of the rigidity of rib-like land part 110 can be controlled.

  According to this embodiment, the shallowest part (end part 160a) is located on the stepping side along the tire circumferential direction TC of the longitudinal groove 154, and the deepest part (end part 160b) is the tire circumferential direction of the longitudinal groove 154. Located on the kick-out side along TC. For this reason, the stones sandwiched between the vertical grooves 154 easily move to the deepest portion (the end portion 160b) as the tire rotates, and thus easily come off the vertical grooves 154.

  According to this embodiment, since the vertical groove 154 is inclined from the shallowest part to the deepest part, drainage can be improved and the occurrence of the hydroplaning phenomenon can be suppressed.

  In the above-described (6) action / effect, the rib-shaped land portion 110, the vertical groove 154, and the like have been described, but it is needless to say that the rib-shaped land portion 120, the vertical groove 158, and the like have the same effects.

(7) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, the shape of the resonator R1 is not necessarily limited to the shape of the horizontal groove 152 and the vertical groove 154 described above, and may be different shapes along the tire circumferential direction TC. Specifically, the resonator R1 having a different volume may be provided according to the required resonance frequency band, or may have a shape other than the resonator R1. Further, the shape of the resonator R1 may be different from the outer side when the vehicle is mounted and the inner side when the vehicle is mounted, with the tire equator line CL as a reference.

  In the above-described embodiment, the lateral groove 152 is continuous with the kick-out side end portion 160b along the tire circumferential direction TC of the vertical groove 154, but is not limited thereto, and may be continuous with the stepping-side end portion 160a. This also provides a function as the resonator R1, and the vertical groove 154 can suppress biting of stones such as pebbles.

  In the embodiment described above, the angle θ formed by the line along the side wall of the vertical groove 154 and the line along the tire radial direction TD increases as it goes from the shallowest part to the deepest part. Not limited to this, it may be set according to the shape of the vertical groove 154.

  In the embodiment described above, in the cross section along the tire circumferential direction TC and the tire radial direction TD, the longitudinal groove 154 is inclined from the shallowest part to the deepest part, but is not limited to this, and is gently swelled outward in the tire radial direction. It may be formed in an arc shape or the like.

  In the embodiment described above, the resonator R1 is provided along the tire circumferential direction TC. However, the present invention is not limited to this, and for example, a plurality of resonators may be provided along the tire circumferential direction TC.

  In the embodiment described above, the circumferential grooves 11, 12, and 13 extend linearly along the tire circumferential direction TC. However, if the circumferential groove extends along the tire circumferential direction TC, the circumferential groove 11 is not necessarily straight. The shape is not limited to a zigzag shape and a wave shape.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  θ1, θ2: Angle, CL: Tire equator line, G: Ground plane, R1, R1A, R1B, R1C, R2 ... Resonator, RS ... Road surface, TC ... Tire circumferential direction, TD ... Tire radial direction, TW ... Tread width Direction, W1, W2, W3, W4 ... groove width, 10 ... pneumatic tire, 11, 12, 13 ... circumferential groove, 110, 120 ... rib-like land portion, 152, 152A, 152B, 152C ... lateral groove, 154, 154A, 154B, 154C ... Vertical groove, 156, 156C ... Horizontal groove, 158 ... Vertical groove, 160 ... Bottom surface, 160a, 160b ... End, 162 ... Side wall

Claims (5)

A plurality of rib-like land portions defined by a plurality of circumferential grooves extending along the tire circumferential direction;
Recessed toward the inner side in the tire radial direction, the rib-like land portion is in contact with the road surface to form a predetermined space, and a resonator communicating with the circumferential groove is provided,
A plurality of the resonators are provided along the tire circumferential direction, and include a longitudinal groove extending along the tire circumferential direction, and a lateral groove communicating with the longitudinal groove and the circumferential groove and extending along the tread width direction. Because
The groove width along the tread width direction of the longitudinal groove changes along the tire circumferential direction, and spreads toward the road surface side along the tire radial direction,
The groove depth along the tire radial direction of the longitudinal groove changes along the tire circumferential direction,
In the deepest part where the groove depth is deepest, the groove width is the widest,
In the shallowest part where the groove depth is the shallowest, the groove width is the narrowest tire.   2. The tire according to claim 1, wherein the lateral groove is connected to an end portion on a kick-out side along the tire circumferential direction of the vertical groove.   In the cross section along the tread width direction and the tire radial direction, the angle formed by the line along the side wall of the rib-like land portion and the line along the tire radial direction is from the shallowest portion to the deepest portion. The tire according to claim 1, which becomes larger as going. In the longitudinal groove, the shallowest portion is located on the stepping side along the tire circumferential direction of the longitudinal groove,
The tire according to any one of claims 1 to 3, wherein the deepest portion is positioned on a kick-out side along the tire circumferential direction of the vertical groove.   The tire according to any one of claims 1 to 4, wherein the longitudinal groove inclines from the shallowest portion to the deepest portion in a cross section along a tire circumferential direction and a tire radial direction.

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