JP2012011799A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pneumatic tire in which partial wear resistance is enhanced by preventing a fall-down of blocks while wet performance is well-maintained.SOLUTION: In a pneumatic tire in which a plurality of blocks 3 are partitioned with a plurality of circumferential grooves 1 and a plurality of lug grooves 2, on one wall face of a communicative part of the lug grooves 2 with the circumferential grooves 1, there are installed projections 4 protruding toward the other wall face. These projections 4 are designed to have an overhanging shape in which the projection width on the tread surface side is greater than the projection on the groove bottom side. Also, on the groove bottom on the other wall face side of the lug grooves 2, a bottom lowered part 5 is provided in which the groove depth is made greater than in other parts of the lug grooves 2.

Description

  The present invention relates to a pneumatic tire, and more particularly, to a pneumatic tire that improves uneven wear resistance while maintaining good wet performance.

  In a pneumatic tire, in order to improve wet performance, a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lug grooves extending in the tire width direction are provided in the tread portion, and a plurality of circumferential grooves and lug grooves are used to form a plurality of circumferential grooves and lug grooves. The tread pattern which divided the block is adopted. However, in such a tire, there is a problem that uneven wear tends to occur because the rigidity of the tread portion composed of a plurality of blocks is low.

  In Patent Document 1, in such a tire, a bottom raised portion having a shallow groove depth is provided at the groove bottom of the lug groove, and the groove width of the lug groove in the portion where the bottom raised portion is provided is wider than the groove width of other portions. In addition, it is proposed to ensure rigidity and maintain wet performance.

  However, a tire provided with such a raised bottom portion cannot sufficiently suppress the collapse of the block, and the effect of improving the uneven wear resistance is still insufficient and there is room for improvement.

JP 2007-1484 A

  An object of the present invention is to provide a pneumatic tire that prevents the collapse of a block and improves uneven wear resistance while maintaining good wet performance.

  In order to achieve the above object, the pneumatic tire of the present invention includes a plurality of circumferential grooves extending in the tire circumferential direction in the tread portion, and a plurality of lug grooves extending in the tire width direction and communicating with the circumferential grooves. In the pneumatic tire in which a plurality of blocks are defined by the circumferential groove and the lug groove, a protrusion protruding toward the other wall surface is provided on one wall surface of the communication portion of the lug groove with the circumferential groove. The protrusion has an overhang shape in which the protrusion width on the tread surface side is larger than the protrusion width on the groove bottom side, and the groove bottom on the other wall surface side of the lug groove is grooved more than other portions of the lug groove. A bottom-lowering portion having a large depth is provided.

  In the present invention, since the overhang-shaped protrusion that protrudes from the other wall surface is provided on one wall surface of the communication portion of the lug groove with the circumferential groove, the protrusion comes into contact with the opposite groove wall surface when the block collapses. Therefore, the block can be prevented from falling down, and deformation can be suppressed and uneven wear can be suppressed. Moreover, since it is an overhang shape, the protrusion width gradually decreases toward the groove bottom, and sufficient space for drainage is secured on the groove bottom side of the lug groove, so that the wet performance is maintained. In addition, the bottom of the groove on the other wall side has a bottom-lowering part with a greater depth than the other parts of the lug groove. Can be maintained.

  In this invention, it is preferable that the planar view shape which looked at protrusion from the tread surface side is a mountain-shaped curve. As a result, the side surface of the protrusion becomes a smooth curved surface, so that the flow of water is not hindered by the edge and the like, and the wet performance can be improved. Can be prevented.

  In the present invention, it is preferable that the length in the tire width direction of the protrusion is 30 to 100% of the length in the tire width direction of the lug groove in the ground contact region. Thereby, it becomes possible to make wet performance and uneven wear resistance compatible at a higher level.

  In the present invention, the protrusion width of the protrusion on the tread surface side is preferably 70 to 90% of the groove width of the lug groove. As a result, the protrusion can easily come into contact with the other wall surface, so that the block can be effectively prevented from falling down. Furthermore, it is preferable that the protrusion width on the groove bottom side of the protrusion is 30 to 70% of the protrusion width on the tread surface side. Thereby, even when the protrusion comes into contact with the other wall surface, a space is secured on the groove bottom side, so that the wet performance can be improved.

  In this invention, it is preferable that the height from the groove bottom of a lug groove of a protrusion is 70 to 90% of the groove depth of a lug groove. As a result, the protrusions come into contact with a higher part of the other wall surface, so that the block can be effectively prevented from falling down.

  In this invention, it is preferable that the depth of a bottom-lowering part is 10 to 30% of the groove depth of a lug groove. Thereby, wet performance and uneven wear resistance can be achieved at a higher level.

  In this invention, it is preferable that the tire width direction length in the groove bottom of the lug groove of a bottom-lowering part is 90 to 110% of the tire width direction length of a protrusion. As a result, a sufficient space for drainage can be secured, so that the wet performance can be improved. Furthermore, it is preferable that the length in the tire width direction on the bottom surface of the bottom-lowering portion is 70 to 90% of the length in the tire width direction on the groove bottom of the lug groove in the bottom-lowering portion. Thereby, wet performance and uneven wear resistance can be achieved at a higher level.

  In the present invention, the width of the bottom-lowering portion is preferably 70 to 100% of the width obtained by removing the protrusion width on the groove bottom side of the protrusion from the groove width of the lug groove. As a result, a sufficient space for drainage can be secured, so that the wet performance can be improved.

  In the present invention, the top of the protrusion may be arranged on the circumferential groove side so that the distance from the end of the protrusion on the circumferential groove side to the top of the head is 50% or less of the length in the tire width direction of the protrusion. preferable. Thereby, the fall of the block corner on the main groove side can be effectively prevented, and uneven wear resistance can be further improved.

It is an expanded view which shows an example of the tread pattern of the pneumatic tire which consists of embodiment of this invention. It is a perspective view which expands and shows the block of the shoulder part of the pneumatic tire of FIG. It is the top view which looked at the block of the shoulder part of the pneumatic tire of Drawing 1 from the tread surface side. It is XX arrow sectional drawing of the block of the shoulder part of the pneumatic tire of FIG. It is a YY arrow sectional drawing of the block of the shoulder part of the pneumatic tire of FIG. It is a perspective view which expands and shows the block of the shoulder part of the pneumatic tire which consists of other embodiment of this invention.

  Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a tread pattern of a pneumatic tire according to an embodiment of the present invention, and FIGS.

  As shown in FIG. 1, the tread portion T is formed with three circumferential grooves 1 extending in the tire circumferential direction and a plurality of lug grooves 2 communicating with the circumferential groove 1 and extending in the tire width direction. Yes. The lug groove 2 located on the shoulder portion outside the circumferential groove 1 on the outermost side in the tire width direction extends from the circumferential groove 1 to the outside of the ground contact end E, but here only the portion in the ground contact area is depicted. is doing. A plurality of blocks 3 are formed by the circumferential grooves 1 and the lug grooves 2.

  The circumferential grooves 1 are preferably formed in a straight shape in order to ensure good wet performance. Also, in order to ensure good wet performance, the lug groove 2 disposed in the center region communicates with the circumferential groove 1 at both ends, and the lug groove 2 disposed in the shoulder region is in relation to the outer circumferential groove 1. Communicate. Although FIG. 1 illustrates the case where three circumferential grooves 1 are formed, the number of circumferential grooves 1 is not particularly limited. Further, the direction of inclination of the lug groove 2 is not particularly limited, and is not limited to the pattern shown in FIG.

  As shown in FIGS. 1-5, the protrusion 4 which protrudes toward the other wall surface is formed in one wall surface of the communicating part with respect to the circumferential groove 1 of the lug groove 2. The protrusion 4 has an overhang shape in which the protrusion width W4a on the tread surface side is larger than the protrusion width W4b on the groove bottom side. Further, a bottom-lowering portion 5 having a groove depth larger than that of the other portion of the lug groove 2 is formed at the groove bottom of the lug groove 2 on the side opposite to the side where the projection 4 is provided.

  As described above, since the overhang-shaped protrusion 4 protruding toward the other wall surface is provided on one wall surface of the communication portion of the lug groove 2 with respect to the circumferential groove 1, the lug groove 2 is sandwiched when the block 3 is collapsed. The protrusion 4 abuts against the wall surface of the adjacent block 3 to support the block 3, whereby excessive falling can be prevented. Moreover, since this protrusion 4 is an overhang shape and the protrusion width W4a on the tread surface side is larger than the protrusion width W4b on the groove bottom side, it becomes possible to support the block 3 on the tread surface side. The block 3 can be prevented from falling down efficiently. Furthermore, since the width of the protrusion 4 gradually decreases toward the groove bottom side and a sufficient space for drainage is secured on the groove bottom side of the lug groove 2, the wet performance can be maintained satisfactorily. On the other hand, at the groove bottom of the lug groove 2 on the side opposite to the side on which the protrusions 4 are provided (the other wall surface side), a bottom-lowering portion 5 having a groove depth larger than other portions of the lug groove 2 is formed. Therefore, the lug grooves 2 that are reduced by the protrusions 4 can be compensated, and the wet performance can be maintained better.

  As shown in FIGS. 1-3, it is preferable that the projection 4 has a mountain-shaped curved shape when viewed from the tread surface side. Since the side surface of the protrusion 4 does not have an edge and becomes a smooth curved surface, the water flow is good and wet performance can be improved. Furthermore, since the contact surface of the projection 4 supporting the block 3 is a smooth curved surface, the stability is increased when the block 3 is supported, and the projection 4 is hardly worn. When the protrusions are curved in this manner, more preferably, the radii R1, R2 and R3 of the curved portions are 30 to 500% of the groove width W2 of the lug grooves 2 as shown in FIG. good. If the radius R1, R2, R3 of the curved portion is less than 30% of the groove width W2 of the lug groove 2, the arc of the curved portion is small and the protrusion 4 is sharp, so that uneven wear resistance is reduced. On the other hand, when the radius R1, R2, R3 of the curved portion exceeds 500% of the groove width W2 of the lug groove 2, the drainage performance deteriorates and sufficient wet performance cannot be obtained.

  The length L4 of the protrusion 4 is preferably 30 to 100% of the length L2 of the lug groove 2. Here, the length L2 of the lug groove 2 is a dimension measured in the tire width direction of the lug groove 2 in the ground contact region as shown in FIG. It is a dimension measured in the tire width direction. Thus, the wet performance can be further improved by specifying the length L4 of the protrusion 4 in the tire width direction. If the length L4 of the protrusion 4 is less than 30% of the length L2 of the lug groove 2, the protrusion 4 cannot sufficiently support the block 3 when the block 3 is collapsed. On the contrary, if the length L4 of the protrusion 4 is larger than 100% of the length L2 of the lug groove 2, the drainage space of the lug groove 2 is reduced, so that the wet performance is impaired.

  More preferably, the length L4 of the protrusion 4 is set to 30 to 50% of the length L2 of the lug groove 2 in the center portion inside the circumferential groove 1 on the outermost side in the tire width direction, and the outermost side in the tire width direction is set. In the shoulder portion outside the circumferential groove 1, the length L4 of the reinforcing portion 4 is preferably set to 50 to 100% of the length L2 of the lug groove 2.

  As shown in FIG. 5, the protrusion 4 is formed in an overhang shape, and the protrusion width W <b> 4 a on the tread surface side of the protrusion 4 is preferably 70 to 90% of the groove width W <b> 2 of the lug groove 2. By specifying the protrusion width W4a of the protrusion 4 in this manner, the protrusion 4 can easily come into contact with the other wall surface, so that the block 3 can be effectively prevented from falling down. Furthermore, the protrusion width W4b on the groove bottom side of the protrusion 4 is preferably 30 to 70% of the protrusion width W4a on the tread surface side of the protrusion 4. By specifying the range for the protrusion width W4a on the tread surface side in this way, a sufficient space can be secured on the groove bottom side when the protrusion 4 comes into contact with the block 3, so that the drainage performance is improved and the wet performance is improved. Can be improved. If the protrusion width W4b on the groove bottom side is less than 30% of the protrusion width W4a on the tread surface side, the width of the protrusion 4 is significantly smaller on the groove bottom side than the tread surface side, and the durability of the protrusion 4 is reduced. Uneven wear resistance decreases. On the contrary, if the protrusion width W4b on the groove bottom side exceeds 70% of the protrusion width W4a on the tread surface side, the space formed on the groove bottom side cannot be sufficiently secured, so that the drainage performance is lowered and sufficient wet performance is obtained. I can not.

  In the present invention, as shown in FIGS. 4 and 5, it is preferable that the height H4 of the protrusion 4 from the bottom of the lug groove 2 is 70 to 90% of the groove depth D2 of the lug groove 2. . Thus, by specifying the height H4 from the groove bottom of the protrusion 4, it becomes possible to contact the higher part of the wall surface of the block 3 where the protrusion 4 faces, so that the block 3 is effectively collapsed. Can be prevented. If the height H4 of the protrusion 4 is less than 70% of the groove depth D2 of the lug groove 2, it is impossible to contact the high position of the wall surface of the block 3 and the uneven wear resistance is lowered. On the contrary, if the height H4 of the protrusion 4 exceeds 90% of the groove depth D2 of the lug groove 2, the proportion of the protrusion 4 in the lug groove 2 becomes too large, so that the drainage performance is lowered and sufficient wet performance is obtained. I can't.

  In the present invention, as shown in FIGS. 4 and 5, the bottom-lowering portion 5 is provided on the groove bottom opposite to the side on which the projection 4 of the lug groove 2 is provided. The depth D5 of the bottom-lowering portion 5 is preferably 10 to 30% of the groove depth D2 of the lug groove 2. Thus, by specifying the depth D5 of the bottom-lowering part 5, drainage performance can be improved and wet performance can be improved. If the depth D5 of the bottom-lowering portion 5 is less than 10% of the groove depth D2 of the lug groove 2, the cross-sectional area of the bottom-lowering portion 5 becomes too small, so that drainage performance cannot be obtained sufficiently and wet performance is sufficiently improved. I can't do it. When the depth D5 of the bottom raised portion 5 exceeds 30% of the groove depth D2 of the lug groove 2, the cross-sectional area of the bottom lowered portion 5 becomes too large, and the bottom lowered portion 5 is easily deformed, so that uneven wear resistance is reduced. .

  In the present invention, it is preferable that the length L5a of the bottom-lowering portion 5 at the groove bottom of the lug groove 2 is 90 to 110% of the length L4 of the protrusion 4. Here, the length L5a of the bottom-lowering portion 5 is a dimension measured in the tire width direction of the bottom-lowering portion 5 at the groove bottom of the lug groove 2, as shown in FIG. Is a dimension measured in the tire width direction of the protrusion 4. Thus, by specifying the length in the tire width direction at the groove bottom of the lug groove 2 of the bottom-lowering portion 5, the drainage performance can be improved and the wet performance can be improved. If the length L5a of the bottom-lowering part 5 is less than 90% of the length L4 of the protrusion 4, the bottom-lowering part 5 is too short relative to the length of the protrusion 4, so that the effect of improving the wet performance is sufficient. It is not obtained. Conversely, when the length L5a of the bottom raised portion 5 exceeds 110% of the length L5a of the protrusion 4, the bottom lowered portion 5 becomes too wide and the uneven wear resistance is lowered.

  As shown in FIG. 4, the cross-sectional shape of the bottom-lowering portion 5 when notched along the longitudinal direction of the lug groove 2 is such that the length L5b of the bottom-lowering portion 5 at the bottom surface of the bottom-lowering portion 5 is at the bottom of the lug groove. A trapezoidal shape that is smaller than the length L5a of the bottom-lowering portion 5 is preferable. Although the length L5b at the bottom surface of the bottom-lowering portion 5 and the length L5a at the bottom of the lug groove may be rectangular, the trapezoidal shape improves water flow and improves drainage performance. Wet performance can be improved. In particular, the length L5b at the bottom surface of the bottom-lowering portion 5 is preferably 70 to 90% of the length L5a at the groove bottom of the lug groove 2. When the length L5b at the bottom surface of the bottom-lowering portion 5 is less than 70% of the length L5a at the bottom of the lug groove 2, the volume of the bottom-lowering portion is reduced, so that the drainage performance is reduced and the wet performance is improved. Cannot be obtained sufficiently. If the length L5b at the bottom surface of the bottom-lowering portion 5 exceeds 90% of the length L5a at the groove bottom of the lug groove 2, it is substantially equivalent to a rectangular shape, and the effect of improving wet performance cannot be sufficiently obtained. In addition, you may make the bottom-lowering part 5 into a smooth curved surface.

  In the present invention, the bottom-lowering portion 5 is provided between the top of the protrusion 4 at the groove bottom and the groove wall on the opposite side of the protrusion 4, so that the bottom-lowering portion 5 extends from the groove width W 2 of the lug groove 2 to the protrusion 4. Of the groove bottom side except for the protruding width W4b. Therefore, it is preferable that the width W5 of the bottom-lowering portion 5 is 70 to 100% of the length W2-W4b obtained by removing the protrusion width W4b on the groove bottom side of the protrusion 4 from the groove width W2 of the lug groove 2. If the width W5 of the bottom-lowering part 5 is less than 70% of the length W2-W4b, the bottom-lowering part 5 is too narrow, so that the drainage performance is lowered and sufficient wet performance cannot be obtained. On the contrary, when the width W5 of the bottom-lowering part 5 exceeds 100% of the length W2-W4b, the bottom-lowering part 5 enters under the protrusion part 4, and manufacture becomes difficult. Moreover, since the bottom-lowering part 5 becomes too large in the width direction, uneven wear resistance decreases.

  As shown in FIG. 6, the top 4 t of the protrusion 4 does not have to be positioned at the center 4 c in the width direction of the protrusion 4, and the top 4 t of the protrusion 4 is changed in the longitudinal direction of the lug groove 2. The location where the protrusion 4 abuts against the opposing block 3 can be varied. By doing so, the location which prevents the block 3 from falling down can be appropriately changed. In particular, the top 4t of the protrusion 4 is arranged on the circumferential groove side so that the distance L4t from the end on the circumferential groove side of the protrusion 4 to the top 4t is 50% or less of the length L4 of the protrusion 4. It is preferable. Thus, by arranging the top 4t of the protrusion 4 on the circumferential groove side, it is possible to effectively prevent the corner 3 from being collapsed, which is greatly affected by deformation and movement in the block 3. If the distance L4t from the end of the protrusion 4 on the circumferential groove side to the top 4t exceeds 50% of the length L4 of the protrusion 4, the uneven wear resistance cannot be sufficiently improved.

  The tire size is 225 / 45R17, and the tread portion is provided with three circumferential grooves extending straight in the tire circumferential direction and a plurality of lug grooves extending in the tire width direction. In the pneumatic tire which divided the block, 17 types of tires of conventional examples, comparative examples 1 to 3, and examples 1 to 13 in which the structure of the communication portion with the circumferential groove of the lug groove is as shown in Tables 1 and 2 Created.

  The conventional example is an example in which a raised portion is provided in the lug groove. Comparative Example 1 is an example in which a protrusion that is not an overhang shape is provided in the lug groove while no bottom-lowering portion is provided. Comparative Example 2 is an example in which a lug groove is provided with a protrusion and a bottom-lowering portion that are not overhanging. Comparative Example 3 is an example in which an overhang-shaped protrusion is provided in the lug groove but no bottom-lowering portion is provided.

  Examples 1 to 13 are examples in which an overhang-shaped protrusion and a bottom-lowering portion are provided in a lug groove. For the protrusion, the tread surface side protruding width, groove bottom side protruding width, tire width direction length, height from the groove bottom, respectively, the bottom lowered part, the depth, the length at the lug groove bottom, The length and width at the bottom are different. In Tables 1 and 2, the protrusion width on the tread surface side of the protrusion is expressed by the ratio of the protrusion width on the tread surface side to the groove width of the lug groove (W4a / W2 × 100%). Expressed by the ratio of the groove bottom side protruding width to the surface side protruding width (W4b / W4a × 100%), the length of the protrusion in the tire width direction is the ratio of the length of the protrusion in the tire width direction of the lug groove in the tire width direction. (L4 / L2 × 100%), and the height of the protrusion from the groove bottom is expressed by the ratio of the height from the groove bottom to the lug groove depth (H4 / D2 × 100%). The depth is expressed by the ratio of the depth of the bottom lowered portion to the depth of the lug groove (D5 / D2 × 100%), and the length of the bottom lowered portion at the bottom of the lug groove is the bottom lowered with respect to the length of the protrusion in the tire width direction. Length ratio at the bottom of the lug groove (L5a / L4 × 100 ), And the length at the bottom of the bottom-lowering portion is expressed by the ratio of the length at the bottom of the bottom-lowering portion to the length at the bottom of the groove (L5b / L5a × 100%). The width of the lowered portion is expressed by the ratio of the width of the bottom lowered portion to the length obtained by removing the protrusion width on the groove bottom side of the protrusion from the groove width of the lug groove (W5 / (W2−W4b) × 100%).

  About these 17 types of tires, uneven wear resistance and wet performance were evaluated by the following evaluation methods, and the results are also shown in Tables 1 and 2.

Uneven wear resistance A test tire is assembled to a wheel with a rim size of 7 1 / 2J and mounted on a test vehicle. After running 5000 km on a test course consisting of an asphalt road surface at an air pressure of 220 kPa, four blocks on the shoulder circumference of the tire The difference between the amount of wear at both ends in the tire width direction and the amount of wear at the center in the tire width direction was measured. The evaluation results are shown as an index with the conventional example being 100, using the reciprocal of the measured value. The larger the index value, the smaller the difference in the amount of wear and the better the uneven wear resistance.

Wet performance The test tire was assembled on a wheel with a rim size of 71 / 2J and mounted on a test vehicle, and the wet performance was evaluated on a test course with air pressure of 220 kPa sprinkled on the asphalt road surface. The evaluation results are shown as an index with the conventional example being 100. A larger index value means better wet performance.

  As can be seen from Tables 1 and 2, all of Examples 1 to 13 significantly improve uneven wear resistance while maintaining good wet performance in comparison with the conventional example, and highly compatible with these performances. did. On the other hand, Comparative Examples 1 to 3 were insufficient in improving wet performance and uneven wear resistance.

1 circumferential groove 2 lug groove 3 block 4 protrusion 5 bottom-lowering portion T tread portion E tire ground contact edge

Claims (11)

The tread portion is provided with a plurality of circumferential grooves extending in the tire circumferential direction and a plurality of lug grooves extending in the tire width direction and communicating with the circumferential grooves, and the plurality of blocks are formed by the circumferential grooves and the lug grooves. In partitioned pneumatic tires,
Protrusion projecting toward the other wall surface is provided on one wall surface of the lug groove communicating with the circumferential groove, and the protrusion has an overhang where the protrusion width on the tread surface side is larger than the protrusion width on the groove bottom side. A pneumatic tire having a shape and a bottom-lowering portion having a groove depth larger than other portions of the lug groove at the groove bottom on the other wall surface side of the lug groove.   The pneumatic tire according to claim 1, wherein a shape of the projection viewed from the tread surface side is a mountain-shaped curve.   The pneumatic tire according to claim 1 or 2, wherein a length of the protrusion in the tire width direction is 30 to 100% of a length in the tire width direction of the lug groove in the contact area.   The pneumatic tire according to claim 1, 2, or 3, wherein a protrusion width of the protrusion on the tread surface side is 70 to 90% of a groove width of the lug groove.   The pneumatic tire according to any one of claims 1 to 4, wherein a protrusion width on the groove bottom side of the protrusion is 30 to 70% of a protrusion width on the tread surface side.   The pneumatic tire according to any one of claims 1 to 5, wherein the height of the protrusion from the groove bottom of the lug groove is 70 to 90% of the groove depth of the lug groove.   The depth of the said bottom-lowering part is 10 to 30% of the groove depth of the said lug groove, The pneumatic tire in any one of Claims 1-6 characterized by the above-mentioned.   The air according to any one of claims 1 to 7, wherein a length in a tire width direction at a bottom of the lug groove of the bottom-lowering portion is 90 to 110% of a length in the tire width direction of the protrusion. Tires.   The tire width direction length in the bottom face of the said bottom-lowering part is 70 to 90% of the length in the groove bottom of the said lug groove of the said bottom-lowering part, The one in any one of Claims 1-8 characterized by the above-mentioned. Pneumatic tire.   The width of the bottom-lowering portion is 70 to 100% of the width obtained by removing the protrusion width on the groove bottom side of the protrusion from the groove width of the lug groove. Pneumatic tires.   The top of the protrusion is disposed on the circumferential groove side so that the distance from the end of the protrusion on the circumferential groove side to the top of the protrusion is 50% or less of the length in the tire width direction of the protrusion. The pneumatic tire according to any one of claims 1 to 10.

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