JP5953064B2 - tire - Google Patents

Description

  The present invention relates to a tire in which a circumferential groove extending in the tire circumferential direction is formed in a tread portion.

  Conventionally, a tire in which a circumferential groove extending in the tire circumferential direction is formed in a tread portion is widely known (see, for example, Patent Document 1). When traveling on a wet road surface in rainy weather, water on the road surface enters the circumferential groove. Since the circumferential groove extends along the rotation direction of the tire, the water that has entered the circumferential groove is efficiently discharged along the circumferential groove. For this reason, the tire in which the circumferential groove is formed has good drainage performance.

JP 2011-235812 A

  Since the circumferential groove extends along the rotation direction of the tire, stones on the road surface easily enter the circumferential groove. If the size of the stone that has entered the circumferential groove is the same as the width of the circumferential groove along the tread width direction, so-called stone biting occurs where the stone is caught between both walls of the circumferential groove. .

  If the vehicle is run with the stones sandwiched, the stones may be pushed by the road surface and hit the groove bottom. If the stone repeatedly hits the groove bottom, the groove bottom is damaged and a crack is generated at the groove bottom. The generated crack sometimes reaches the belt that reinforces the tire. Thereby, since the belt is exposed to the outside, the belt is easily damaged. If the belt is damaged, the durability of the tire is greatly reduced.

  In a heavy-duty tire having a large groove width in the circumferential groove, a problem that a crack is generated in the groove bottom is particularly remarkable because stones easily enter the circumferential groove.

  Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a tire that can suppress the occurrence of cracks generated in the groove bottom due to stones that have entered the circumferential groove.

  In order to solve the above-described problems, the present invention has the following features. A feature of the present invention is a tire in which a circumferential groove extending in the tire circumferential direction is formed in a tread portion, and protrudes in the tread width direction on one side wall and the other side wall of the circumferential groove, and In the cross section along the tire circumferential direction and the tire radial direction, the protrusion extends while being inclined with respect to the tire radial direction, and The gist is that the extending direction in which the protrusions formed on the side walls of the first film extend and the extending direction in which the protrusions formed on the second side wall extend are the same direction.

  10 mm or more and 30 mm or less may be sufficient as the length of the said protrusion along the said tire circumferential direction.

  The length in the tire radial direction from the upper end of the protrusion in the tire radial direction to the tread surface in contact with the road surface is 3 mm or more, and from the lower end of the protrusion in the tire radial direction, the circumferential main groove The length in the tire radial direction to the groove bottom may be 1 mm or more and 4 mm or less.

  As the tire advances in the rotational direction, the height of the protrusion in the tire radial direction may decrease.

  The positions of the protrusions formed on the one side wall and the protrusions formed on the other side wall in the tire circumferential direction may coincide with each other.

  In a cross section orthogonal to the extending direction in which the protrusion extends, the width of the protrusion may be 2 mm or more and less than or equal to half of the length of the protrusion along the tire circumferential direction.

  In the cross section orthogonal to the extending direction in which the protrusion extends, the protrusion height at which the protrusion protrudes from the side wall is 0.5 mm or more and the width of the circumferential groove along the tread width direction 1/3 or less.

  In the cross section orthogonal to the extending direction in which the protrusion extends, the protrusion may protrude in an arc shape.

  The angle formed between the extending direction and the tire circumferential direction may be not less than 40 degrees and not more than 70 degrees.

  The positions of the protrusions formed on the one side wall and the protrusions formed on the other side wall in the tire circumferential direction may be shifted.

  According to the present invention, it is possible to suppress the occurrence of cracks generated at the groove bottom due to the stones that have entered the circumferential groove.

FIG. 1 is a partial perspective view of a circumferential groove 100 according to the present embodiment. FIG. 2 is a partially enlarged plan view of the circumferential groove 100 according to the present embodiment. FIG. 3 is a cross-sectional view of the circumferential groove 100 along the tread width direction twd and the tire radial direction trd. FIG. 4 is a cross-sectional view of the circumferential groove 100 along the tire circumferential direction tcd and the tire radial direction trd. FIG. 5 is a cross-sectional view orthogonal to the extending direction e in which the protrusion 10 extends. FIG. 6 is a partially enlarged plan view of the circumferential groove 100 according to another embodiment. FIG. 7 is a cross-sectional view of a circumferential groove 100 according to another embodiment along the tire circumferential direction tcd and the tire radial direction trd.

  An example of a tire according to the present invention will be described with reference to the drawings. Specifically, (1) a schematic configuration of the tire, (2) a schematic configuration of the protrusion 10, (3) operational effects, (4) other embodiments, and (5) comparative evaluation will be described.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. 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. It goes without saying that the drawings include parts having different dimensional relationships and ratios.

(1) Schematic Configuration of Tire A tire according to this embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a partial perspective view of a circumferential groove 100 according to the present embodiment. FIG. 2 is a partially enlarged plan view of the circumferential groove 100 according to the present embodiment. That is, FIG. 2 is a view of the circumferential groove 100 viewed from the tire radial direction trd.

  As shown in FIG. 1, in the tire according to the present embodiment, a circumferential groove 100 extending in the tire circumferential direction tcd is formed in the tread portion. The circumferential groove 100 has a groove bottom 130 and a side wall 150. Side wall 150 has side wall 150A located on one side and side wall 150B located on the other side in tread width direction twd. The groove bottom 130 continues the side wall 150A and the side wall 150B in the tread width direction twd. The protrusion 10 is formed on the side wall 150.

  The width M of the circumferential groove 100 along the tread width direction twd is the length in the tread width direction twd from the boundary between the tread surface 5 and the side wall 150A in contact with the road surface to the boundary between the tread surface 5 and the side wall 150B. .

  Although not shown, the tire according to this embodiment includes a bead core, a carcass, and a belt. The bead core is disposed in the bead portion. The carcass is disposed so as to straddle the pair of bead cores. The belt is disposed outside the carcass in the tire radial direction in the tread portion.

(2) Schematic Configuration of Projection 10 A schematic configuration of the projection 10 will be described with reference to FIGS. 1 to 5. FIG. 3 is a cross-sectional view of the circumferential groove 100 along the tread width direction twd and the tire radial direction trd. Specifically, FIG. 3 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a cross-sectional view of the circumferential groove 100 along the tire circumferential direction tcd and the tire radial direction trd. Specifically, FIG. 4 is a BB cross-sectional view of FIG. FIG. 5 is a cross-sectional view orthogonal to the extending direction e in which the protrusion 10 extends. Specifically, FIG. 5 is a CC cross-sectional view of FIG.

  As shown in FIGS. 1 to 3, a plurality of protrusions 10 projecting in the tread width direction twd are formed on one side wall 150 </ b> A and the other side wall 150 </ b> B of the circumferential groove 100. The plurality of protrusions 10 are arranged in the tire circumferential direction tcd.

  The protrusion 10 includes a protrusion 10A and a protrusion 10B. The protrusion 10A is formed on one side wall 150A. The protrusion 10B is formed on the other side wall 150B.

  As shown in FIG. 3, the protrusion 10 has an upper end 20 and a lower end 30. The upper end 20 is the outer end of the protrusion 10 in the tire radial direction trd. The lower end 30 is an end portion inside the protrusion 10 in the tire radial direction trd. The protrusion 10A has an upper end 20A and a lower end 30A. The protrusion 10B has an upper end 20B and a lower end 30B.

  The length h1 in the tire radial direction from the upper end 20 to the tread surface 5 in contact with the road surface is preferably 3 mm or more. That is, it is preferable to satisfy the range of 3 mm ≦ h1. The length h2 in the tire radial direction from the lower end 30 to the groove bottom 130 is preferably 1 mm or more and 4 mm or less. That is, it is preferable to satisfy the range of 1 mm ≦ h2 ≦ 4 mm. The length h2 is the length from the lower end 30 to the groove bottom portion located on the innermost side in the tire radial direction trd. In the present embodiment, the groove bottom portion located on the innermost side in the tire radial direction trd is located on the tire equator line CL.

  As shown in FIG. 4, in the cross section along the tire circumferential direction tcd and the tire radial direction trd, the protrusion 10 extends while being inclined with respect to the tire radial direction trd. In the present embodiment, the protrusion 10 extends linearly. In the cross section, the extending direction e in which the protrusion 10A formed on the side wall 150A extends and the extending direction e in which the protrusion 10B formed on the side wall 150B extends are the same direction. The angle θ formed between the extending direction e of the protrusion 10A and the tire radial direction trd is equal to the angle θ formed between the extending direction e of the protruding part 10B and the tire radial direction trd. The angle θ between the extending direction e in which the protrusion 10 extends and the tire circumferential direction tcd is preferably 40 degrees or more and 70 degrees or less.

  Note that the extending direction e in which the protruding portion 10A extends and the extending direction e in which the protruding portion 10B extends are the same direction, as viewed from the tread width direction twd, and the protruding portion 10A and the protruding portion. 10B means that the direction of inclination is the same. Specifically, in FIG. 4, the protrusions 10 </ b> A and the protrusions 10 </ b> B each have an upper end 20 </ b> A inclined to the right. Therefore, the angle θ by the protrusion 10A and the angle θ by the protrusion 10B may not be equal. That is, the angle formed between the extending direction e of the protrusion 10A and the tire radial direction trd and the angle formed between the extending direction e of the protruding part 10B and the tire radial direction trd may not be equal.

  Since the protrusion 10 extends while inclining with respect to the tire radial direction trd, the height of the protrusion 10 in the tire radial direction trd changes. Specifically, the height of the protrusion 10 in the tire radial direction trd decreases from one side to the other side in the tire circumferential direction tcd. In the present embodiment, as shown in FIG. 4, as the tire advances in the rotation direction R, the height of the protrusion 10 in the tire radial direction trd decreases. That is, in the tire circumferential direction tcd, the direction from the upper end 20 to the lower end 30 of the protrusion 10 coincides with the rotational direction R.

  In the tire according to this embodiment, the rotation direction is specified. The tire according to the present embodiment is marked with a mark indicating the rotation direction (not shown).

  The length D of the protrusion 10 along the tire circumferential direction tcd is preferably 10 mm or more and 30 mm or less. That is, it is preferable to satisfy the range of 10 mm ≦ D ≦ 30 mm. In the present embodiment, the length D is equal to the pitch interval P from one protrusion 10 to another protrusion 10 adjacent to the one protrusion 10 in the tire circumferential direction tcd.

  The positions of the protrusion 10A and the protrusion 10B in the tire circumferential direction tcd coincide with each other. Accordingly, the positions of the upper end 20A and the upper end 20B in the tire circumferential direction tcd coincide with each other, and the positions of the lower end 30A and the lower end 30B in the tire circumferential direction tcd coincide with each other. Accordingly, the protrusion 10A and the protrusion 10B overlap each other when viewed from the tread width direction twd.

  As shown in FIG. 5, the protrusion 10 protrudes in an arc shape in a cross section orthogonal to the extending direction e in which the protrusion 10 extends. In the cross section orthogonal to the extending direction e in which the protrusion 10 extends, the surface of the arc-shaped protrusion 10 is the protrusion 10, the side wall 150, the nodes a and b, which are nodes, and the protrusion in the tread width direction twd. It passes through the vertex c of the part 10.

  As shown in FIG. 5, the width w of the protrusion 10 is preferably 2 mm or more and not more than half of the length D of the protrusion 10 along the tire circumferential direction tcd. That is, it is preferable to satisfy the range of 2 mm ≦ w ≦ D / 2. In addition, the width | variety of the protrusion 10 is the width w orthogonal to the tread width direction twd. That is, the width of the protrusion 10 is a width along the side wall 150.

  As shown in FIG. 5, the protrusion height t at which the protrusion 10 protrudes from the side wall 150 is 0.5 mm or more and 1/3 or less of the width M of the circumferential groove 100 along the tread width direction twd. Preferably there is. That is, it is preferable to satisfy the range of 0.5 mm ≦ t ≦ M / 3.

(3) Effects According to the present embodiment, the protrusions 10 projecting in the tread width direction twd are formed on the side wall 150A and the side wall 150B of the circumferential groove 100, so that the stone that has entered the circumferential groove 100 is It is easy to hit the protrusion 10. Since the protrusion 10 can inhibit the stone from approaching the groove bottom 130, it is possible to suppress the groove bottom 130 from being damaged and cracking from occurring in the groove bottom 130. In addition, the side wall 150 on which the protrusion 10 is formed is hard to hit the stone by the protrusion 10, so that the side wall 150 can be prevented from being damaged.

  Further, the protrusion 10 extends while being inclined with respect to the tire radial direction trd, and the extending direction e of the protruding part 10A formed on the side wall 150A and the extending direction e of the protruding part 10B formed on the side wall 150B. Is the same direction. Centrifugal force acts on the stone that has entered the circumferential groove 100 by the rotation of the tire. When the tire is mounted such that the height of the protrusion 10 in the tire radial direction trd becomes lower as the tire proceeds in the rotation direction R, the tire extends more than the case where the extending direction e is parallel to the tire radial direction. The magnitude of the centrifugal force acting along the extending direction e inclined with respect to the radial direction trd increases. Therefore, the stones that enter the circumferential groove 100 and are sandwiched between the protrusions 10 adjacent to the tire circumferential direction tcd are easily discharged along the extending direction e. As a result, the occurrence of stone biting can be prevented and the occurrence of cracks occurring at the groove bottom can be suppressed.

  Moreover, it is preferable that the length D of the protrusion 10 along the tire circumferential direction tcd is 10 mm or more and 30 mm or less. Thereby, the stone that has entered the circumferential groove 100 can be efficiently discharged.

  Further, the length h1 in the tire radial direction from the upper end 20 to the tread surface 5 is preferably 3 mm or more. The length h2 in the tire radial direction from the lower end 30 to the groove bottom 130 is preferably 1 mm or more and 4 mm or less. Thereby, the stone that has entered the circumferential groove 100 can be efficiently discharged. Furthermore, when the length h1 is 3 mm or more, the protrusion 10 is difficult to contact the road surface. For this reason, damage to the protrusion 10 can be suppressed, and the occurrence of stone biting can be prevented over a long period of time. Moreover, drainage performance can be improved because length h2 is 1 mm or more. When length h2 is 4 mm or less, it can suppress that a stone is pinched | interposed between the protrusion 10 and the groove bottom 130. FIG. As a result, the generation of cracks occurring in the groove bottom 130 can be further suppressed.

  Further, the positions of the protrusion 10A and the protrusion 10B in the tire circumferential direction tcd coincide with each other. Therefore, stones sandwiched between the two protrusions 10A adjacent to the tire circumferential direction tcd and the two protrusions 10B adjacent to the tire circumferential direction tcd are easily discharged along the extending direction e. As a result, the occurrence of stone biting can be prevented and the occurrence of cracks occurring at the groove bottom can be suppressed.

  Further, the width w of the protrusion 10 is preferably 2 mm or more and not more than half of the length D of the protrusion 10 along the tire circumferential direction tcd. When the width w of the protrusion 10 is 2 mm or more, the area where the protrusion 10 contacts the side wall 150 increases. For this reason, even if a stone collides with the protrusion 10, the protrusion 10 becomes difficult to peel from the side wall 150, and generation | occurrence | production of a stone bit can be prevented over a long period of time. Since the width w of the protrusion 10 is less than or equal to half the length D of the protrusion 10 along the tire circumferential direction tcd, the length between the protrusions 10 adjacent to the tire circumferential direction tcd can be secured. The stone that has entered the directional groove 100 can be efficiently discharged.

  The protrusion height t at which the protrusion 10 protrudes from the side wall 150 is preferably 0.5 mm or more and 1/3 or less of the width M of the circumferential groove 100 along the tread width direction twd. Thereby, the stone that has entered the circumferential groove 100 can be efficiently discharged. When the protrusion height t is 0.5 mm or more, the stone is likely to hit the protrusion 10. It is possible to further inhibit the stone from approaching the groove bottom 130 and to suppress the occurrence of cracks in the groove bottom 130. When the protrusion height t is 1/3 or less of the width M of the circumferential groove 100, it is possible to suppress a decrease in drainage performance.

  Further, in the cross section orthogonal to the extending direction e in which the protrusion 10 extends, the protrusion 10 protrudes in an arc shape. Since the portion where the stone and the protrusion 10 are in contact can be reduced, the stone is less likely to be clogged between the protrusion 10A and the protrusion 10B. As a result, the stone that has entered the circumferential groove 100 can be efficiently discharged.

  In addition, the angle θ formed by the extending direction e in which the protrusion 10 extends and the tire circumferential direction tcd is preferably 40 degrees or more and 70 degrees or less. When the angle θ is not less than 40 degrees and not more than 70 degrees, the extending direction e and the direction of the centrifugal force acting on the stone become closer. For this reason, the magnitude of the centrifugal force acting along the extending direction e increases. Since the stones sandwiched between the protrusions 10 adjacent to each other in the tire circumferential direction tcd are more easily discharged along the extending direction e, the occurrence of cracks in the groove bottom 130 can be further suppressed.

(4) Other Embodiments Although the contents of the present invention have been disclosed through the embodiments of the present invention, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. The present invention includes various embodiments not described herein. Accordingly, the present invention includes various embodiments not described herein.

  Specifically, in the above-described embodiment, the positions of the protrusion 10A and the protrusion 10B in the tire circumferential direction tcd coincide with each other, but the present invention is not limited to this. For example, as shown in FIG. 6, the positions of the protrusion 10A and the protrusion 10B in the tire circumferential direction tcd may be shifted. The positional deviation x between the protrusion 10A and the protrusion 10B in the tire circumferential direction tcd is half the length D of the protrusion 10 along the tire circumferential direction tcd.

  In the above-described embodiment, the protrusion 10 extends linearly, but is not limited thereto. For example, as shown in FIG. 7, the protrusion 10 may extend in an arc shape in a cross section along the tire circumferential direction tcd and the tire radial direction trd. That is, the extending direction e is along the arc. In this case, the center point of the arc is preferably on the tread surface 5 side.

  Moreover, in the embodiment mentioned above, although the protrusion 10 protruded in circular arc shape, it is not restricted to this. For example, in the cross section orthogonal to the extending direction e in which the protrusion 10 extends, the protrusion 10 may protrude in a rectangular shape.

  In the embodiment described above, the length D of the protrusion 10 along the tire circumferential direction tcd is equal to the pitch interval P from one protrusion 10 to another protrusion 10 adjacent in the tire circumferential direction tcd. However, it is not limited to this. The length D and the pitch interval P may be different.

  In the tire according to the present invention, it is only necessary that at least one circumferential groove 100 in which the protrusion 10 is formed is formed. Therefore, the tire according to the present invention may have two circumferential grooves 100 in which the protrusions 10 are formed, or the circumferential grooves 100 and the protrusions 10 in which the protrusions 10 are formed. No circumferential grooves may be formed.

  The tire according to the present invention may be a pneumatic tire or a tire filled with rubber. Moreover, a gas-filled tire other than air containing a rare gas such as argon may be used. The tire according to the present invention can be suitably used in a heavy duty tire.

  As described above, the present invention includes various embodiments 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.

(5) Comparative evaluation In order to confirm the effect of the present invention, the following measurements were performed. In addition, this invention is not limited to a following example.

  For comparative evaluation, as tire wheels (tire load mass: 1900 kg) of a 10-ton truck under conditions of tire size: 295 / 75R22.5, internal pressure: 650 kPa, rim size: 8.25 × 2.5 Tires having the characteristics shown in Table 1 were used.

  In Table 1, the radial length h1 from the tread surface to the protrusion is the length h1 in the tire radial direction from the upper end of the protrusion to the tread surface. The radial length h2 from the protrusion to the groove bottom is the length h2 in the tire radial direction from the lower end of the protrusion to the groove bottom. The circumferential length D of the protrusion is the length D of the protrusion along the tire circumferential direction tcd. The protrusion width w is the width w of the protrusion perpendicular to the tread width direction twd in the cross section orthogonal to the extending direction e. The protrusion height t is the protrusion height t at which the protrusion protrudes from the side wall. The extending angle θ is an angle θ formed by the extending direction e and the tire circumferential direction tcd.

The shape of the protrusion is the shape of the protrusion in a cross section orthogonal to the extending direction e. The deviation in the circumferential direction of the protrusion is a positional deviation in the tire circumferential direction tcd between the protrusion formed on one side wall and the protrusion formed on the other side wall.

  Specifically, the tire according to the comparative example has a circumferential groove in which no protrusion is formed.

  The tire according to Example 1 is the same tire as the embodiment shown in FIGS. 1 to 5. The length h1 is 3 mm and the length h2 is 2 mm. The length D is 20 mm. The protrusion width w is 4 mm. The protrusion height t is 3 mm. The extension angle θ is 60 degrees. The shape of the protrusion is an arc shape. The deviation in the circumferential direction of the protrusion is 0 mm. That is, the positions in the tire circumferential direction tcd of the protrusion formed on one side wall and the protrusion formed on the other side wall are the same.

  The tire according to Example 2 differs from the tire according to Example 1 only in the shape of the protrusions. The shape of the protrusion of the tire according to Example 2 is a rectangular shape.

  The tire according to Example 3 differs from the tire according to Example 1 only in the circumferential displacement of the protrusion. The deviation in the circumferential direction of the protrusion of the tire according to Example 3 is 15 mm.

  The tire according to Example 4 differs from the tire according to Example 1 only in the extension angle θ. The extending angle θ of the tire according to Example 4 is 70 degrees.

  The tire according to Example 5 differs from the tire according to Example 1 only in the extension angle θ. The extending angle θ of the tire according to Example 5 is 80 degrees.

  The tire according to Example 6 differs from the tire according to Example 1 only in length h2. The length h2 of the tire according to Example 6 is 5 mm.

  The tire according to Example 7 differs from the tire according to Example 1 only in the extension angle θ. The extending angle θ of the tire according to Example 7 is 40 degrees.

On a road surface with a lot of pebbles, the test vehicle equipped with the tires was run for 10 km. In one tire of a traveling vehicle, the number of pebbles (the number of stone bites) sandwiched in the circumferential groove and the number of cracks generated at the groove bottom of the circumferential groove were measured. The results are shown in Table 1.

  As shown in Table 1, it was found that the number of stone bites and the number of groove bottom cracks were reduced in each example as compared with the comparative example.

  Further, it was found that the number of stone bites and the number of groove bottom cracks were reduced when the shape of the protrusion was an arc.

  It was also found that the length h2 was 2 mm less than 4 mm, and the number of stone bites and the number of groove bottom cracks were reduced.

  Further, it was found that the number of stone bites and the number of groove bottom cracks decreased when the extension angle θ was 70 degrees or less than 80 degrees.

  5 ... Tread surface, 10, 10A, 10B ... Projection, 20, 20A, 20B ... Upper end, 30, 30A, 30B ... Lower end, 100 ... Circumferential groove, 130 ... Groove bottom, 150, 150A, 150B ... Side wall, tcd ... tire circumferential direction, trd ... tire radial direction, twd ... tread width direction

Claims (8)

A tire in which a circumferential groove extending in a tire circumferential direction is formed in a tread portion,
On one side wall and the other side wall of the circumferential groove, a plurality of protrusions that protrude in the tread width direction and are arranged in the tire circumferential direction are formed.
In the section along the tire circumferential direction and the tire radial direction, the protrusion extends while inclining with respect to the tire radial direction,
In the cross section, the The extending direction of one of the formed protrusion on the side wall is formed on the other side wall to the extending direction extending projections extend, Ri same direction der,
The length in the tire radial direction from the lower end of the protrusion in the tire radial direction to the groove bottom of the circumferential main groove is 1 mm or more and 4 mm or less,
The position of the protrusion formed on the one side wall and the protrusion formed on the other side wall in the tire circumferential direction is shifted .   The tire according to claim 1, wherein a length of the protrusion along the tire circumferential direction is 10 mm or more and 30 mm or less. From the upper end of the projection in the tire radial direction, a length in the tire radial direction to the tread surface contacting the road surface, the tire according to claim 1 or 2 Ru der least 3 mm.   The tire according to any one of claims 1 to 3, wherein a height of the protrusion in the tire radial direction decreases as the tire advances in a rotating direction. The cross section perpendicular to the extending direction in which the protrusions extend has a width of the protrusions of 2 mm or more and less than or equal to half the length of the protrusions along the tire circumferential direction. The tire according to any one of 4 . In the cross section orthogonal to the extending direction in which the protrusion extends, the protrusion height at which the protrusion protrudes from the side wall is 0.5 mm or more and the width of the circumferential groove along the tread width direction The tire according to any one of claims 1 to 5 , wherein the tire is 1/3 or less. The tire according to any one of claims 1 to 6 , wherein the protrusion protrudes in an arc shape in a cross section orthogonal to an extending direction in which the protrusion extends. The tire according to any one of claims 1 to 7 , wherein an angle formed by the extending direction and the tire circumferential direction is not less than 40 degrees and not more than 70 degrees.

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