JP6676452B2 - tire - Google Patents

Description

  The present invention relates to a tire capable of improving the yield by improving the hook removal property.

  Conventionally, in a tire having a sipe on a tread surface of a land block formed on a tread surface, the rigidity of the land block has been improved. Compared with the sipe whose shape is changed only on the tread surface of the tread surface, the sipe whose shape is changed in the tire radial direction (for example, Patent Document 1) has a rigidity of the land block even when the number of sipe is increased. Enhanced. Thus, the sipe whose shape is changed in the tire radial direction can suppress a decrease in the contact area due to the fall of the land block, and is effective in improving the performance of the tire.

JP-A-10-181315

  The sipe whose shape is changed in the tire radial direction tends to have a complicated shape in the tire radial direction, and the shape of a mold blade forming the sipe is also complicated. For this reason, in a tire having a sipe whose shape is changed in the tire radial direction, the pull-out resistance of the blade tends to increase at the time of pulling out after vulcanization at the time of manufacturing, and the pulling out property tends to deteriorate.

  The inventor of the present invention has conducted intensive studies to improve the hook removal property when a sipe having a bent shape in the tire radial direction and a shape changed in the tire radial direction is formed. As a result, a large peak is generated in the pull-out force required when the land block comes off from each blade of the hook when the hook comes off after vulcanization of the tire, and the occurrence of this large peak is a cause of the deterioration of the hook removal property. I found that. The present inventor has further conducted intensive studies on the cause of the large peak.

  In the conventional tire, the positions of the bent portions formed in the tire radial direction (depth direction) of each sipe are aligned in the depth direction (that is, the positions of the bent portions of the blades of the shuttle forming the sipe are aligned). ing). For this reason, when the hook comes off after vulcanization of the tire, the timing at which each small block partitioned between the sipes of the land block comes off from the bent portion of each blade of the hook becomes the same (that is, the bent portion of each blade becomes land). The present inventor has found that the timing of exiting from the block becomes the same) and the peak generated in the pull-out force increases. In particular, it has been found that the fact that the positions of the bent portions at the shallowest positions of the sipes in the depth direction are uniform is a factor that increases the peak of the pull-out force.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a tire capable of improving the hook removal property in the manufacturing process and improving the yield even when a plurality of sipes having a bent portion in the tire radial direction are provided.

(1) A tire according to the present invention includes a plurality of sipe having a crossing groove, a land block defined by the groove, and a bent portion formed in the tire radial direction on the surface of the tread. When the inside of the tire radial direction from the tread surface of the land block is the depth direction, at least one of the plurality of sipes is the position of the bent portion at the shallowest position in the depth direction. However, it is characterized in that it is different from the position in the depth direction of the bent portion at the shallowest position of another sipe.
(2) The tire according to (1), wherein, among the plurality of sipes, adjacent sipes have different positions in the depth direction of the bent portions at their respective shallowest positions. I do.
(3) The tire according to (1), wherein the plurality of sipes have different positions in the depth direction of the bent portions at the shallowest positions of the sipes.
(4) The tire according to (3), wherein the plurality of sipes are three or more sipes, and the bending portions at the shallowest positions in adjacent sipes among the plurality of sipes are connected to each other. A plurality of line segments are all inclined in the same direction with respect to a direction in which the plurality of sipes are arranged on the tread surface of the land block.
(5) The tire according to (2), wherein the plurality of sipes are three or more sipes, and the bent portions at the shallowest positions in adjacent sipes among the plurality of sipes are connected to each other. The plurality of line segments are characterized in that adjacent line segments are inclined in different directions with respect to the direction in which the plurality of sipes are arranged on the tread surface of the land block.

  According to the present invention, even with a plurality of sipes having a bent portion in the tire radial direction, by suppressing the peak value of the pull-out force required at the time of hook removal in the manufacturing process, to improve the hook removal properties, A tire capable of improving the yield can be provided.

FIG. 1 is a diagram illustrating a tread pattern according to the first embodiment. FIG. 2 is a perspective view of a main part of the tread according to the first embodiment. FIG. 3 is a diagram illustrating an example of sipe arrangement in the first embodiment. FIG. 4 is a diagram illustrating an example of sipe arrangement in the second embodiment. FIG. 5 is a diagram illustrating an example of a sipe arrangement according to the third embodiment. FIG. 6 is a diagram illustrating a prediction result of a pull-out force according to the second embodiment.

  Hereinafter, a tire according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a tread pattern of the tire according to the first embodiment. FIG. 2 shows a perspective view of a main part of the tread according to the first embodiment.

  A circumferential groove 12 is formed on the surface of the tread 11 so as to extend along the circumferential direction of the tire, which is a plurality of crossing grooves, and is formed to extend along a direction intersecting the circumferential groove 12. A lateral groove (lug groove) 13 and a plurality of land blocks 14 defined by the circumferential groove 12 and the lateral groove 13 are provided. Each land block 14 has a plurality of sipes 15 (151 to 154) on the tread side (the surface side of the land block 14). In addition, the code | symbol CL of FIG. 1 is a center line which shows the center of the width direction of a tire.

  The sipe 15 extends in the tire width direction on the surface (the tread surface) of the land block 14, and is a sipe whose shape is changed in the tire radial direction in a plane perpendicular to the tire width direction.

  Here, the shape of the sipe 15 on the surface (tread surface) of the land block 14 is, for example, a straight line parallel to the tire width direction. The shape of the sipe 15 on the surface of the land block 14 may be a sawtooth wave, a trapezoidal wave, or the like.

  FIG. 3 is a diagram illustrating an example of the arrangement of sipes in the first embodiment (a diagram illustrating a cross section of the land block along the tire circumferential direction). Here, the depth direction is defined as the inner side in the tire radial direction l0 from the surface (tread surface) 14k of the land block 14.

  Each of the sipes 15 (151 to 154) has a first bent portion a1 to a4 and a second bent portion b1 to b4 in the tire radial direction l0. The sipes 151 to 154 are linearly inclined with respect to the tire radial direction with the shallowest portions (shallowest ends) c1 to c4, which are open ends to the surface (the tread surface) 14k of the land block 14, as starting points. A first inclined portion 15p terminating at one bent portion a1 to a4 is provided. In addition, the sipes 151 to 154 have a first bent portion a1 to a4 as a starting end, a second inclined portion 15q that ends at a second bent portion b1 to b4, and a second bent portion b1 to b4 as a starting end. And a third inclined portion 15r having a sipe deepest portion (deepest end) e1 to e4 which is the innermost in the tire radial direction of the sipe. Here, the first bent portions a1 to a4 are bent portions at the lowest position, the second bent portions b1 to b4 are bent portions at the lowest position, and the first inclined portion 15p is the lowest position. This is a sipe portion, and the third inclined portion 15r is a deepest sipe portion.

  The land block 14 is divided into small blocks 143 to 147 by sipes 151 to 154.

  In the present embodiment, the first inclined portion 15p and the third inclined portion 15r of the sipes 151 to 154 have substantially the same inclination angle with respect to the tire radial direction, but the two inclination angles may be different. . Further, the inclination angles of the first and third inclined portions 15p and 15r with respect to the tire radial direction may be different between the sipes 151 to 154. In the present embodiment, the second inclined portion 15q also has the same inclination angle with respect to the tire radial direction among the sipes 151 to 154, but may have a different inclination angle.

  In the present embodiment, as shown in FIGS. 2 and 3, among the sipes 151 to 154, adjacent sipes have different depth-wise positions of the first bent portions at their respective shallowest positions. That is, adjacent sipes 151 and 152 are different from each other in the depth direction positions D1 and D2 of the first bent portions a1 and a2 at the respective shallowest positions. Adjacent sipes 152 and 153 differ from each other in the depth positions D2 and D3 of the first bent portions a2 and a3 at the respective shallowest positions. Adjacent sipes 153 and 154 differ from each other in the depth positions D3 and D4 of the first bent portions a3 and a4 at the shallowest positions. In the present embodiment, the same sipe is used for sipes that are not adjacent to each other. Therefore, in the sipes 151 and 153 that are not adjacent to each other, the positions D1 and D3 in the depth direction of the first bent portions a1 and a3 are the same position (depth D1 = depth D3), In 152 and 154, the positions D2 and D4 in the depth direction of the first bent portions a2 and a4 are the same position (depth D2 = depth D4).

  As described above, in the present embodiment, adjacent sipes have different depth-wise positions of the first bent portions at the respective shallowest positions. Thereby, at the time of hook removal after vulcanization of the tire, the bent portions of the blades forming the first bent portions a1, a2 of the blades forming the adjacent sipes 151, 152 come off from the land block 14. The timing can be shifted. Note that the bent portion on the blade side that forms the first bent portion of the sipe is hereinafter referred to as a first bent portion of the blade.

  In other words, in the adjacent small blocks 144 and 145, the timing at which the small block 144 exits from the first bent portion of the blade forming the sipe 151 and the timing at which the small block 145 moves from the first bent portion of the blade forming the sipe 152 The exit timing can be shifted. Similarly, in the adjacent small blocks 145 and 146, the timing at which the small block 145 escapes from the first bent portion of the blade forming the sipe 152, and the timing at which the small block 146 moves out of the first bent portion of the blade forming the sipe 153 The exit timing can be shifted. Further, in the adjacent small blocks 146 and 147, the timing at which the small block 146 escapes from the first bent portion of the blade forming the sipe 153 and the small block 147 escapes from the first bent portion of the blade forming the sipe 154. The timing can be shifted.

  Therefore, in the present embodiment, the timing at which the small blocks adjacent to each other in the land block come off from the first bent portion of the shuttle blade in the manufacturing process can be shifted. As a result, the present embodiment can suppress the peak value of the pull-out force required at the time of the hook removal even if it includes a plurality of sipes having a bent portion in the tire radial direction, and improves the hook removal property. , Yield can be improved. That is, by reducing the peak value of the pull-out force required at the time of hook removal, the small block can easily come off from the blade, and in the present embodiment, the amount of deformation of the small block at the time of hook removal can be reduced. Thus, in the present embodiment, it is possible to suppress breakage of the small block when the hook comes off, and to improve the production yield.

  Here, a line segment connecting the first bent portions at the shallowest position in the adjacent sipes in the sipes 151 to 154, that is, the first bent portions a1 and a2, and the first bent portions a2 and a3. And the line segments connecting the first bent portions a3 and a4 are referred to as line segments l1, l2 and l3, respectively. In the present embodiment, the line segments l1, l2, and l3 are adjacent to each other in the direction in which the sipes 151 to 154 are lined up on the surface (tread surface) 14k of the land block 14 (here, the tire circumferential direction). On the other hand, they are inclined in different directions. That is, the line segments l1 and l2 have different inclination directions with respect to the tire circumferential direction, and the line segments l2 and l3 have different inclination directions with respect to the tire circumferential direction.

  Here, the inclination in different directions (that is, the inclination directions are different) means that, in the line segments, the position Dn in the depth direction of the first bent portion an as the starting point and the first bent portion an as the end point. This means that the magnitude relationship between the depth and the position Dn + 1 in the depth direction of +1 is different. For example, in the line segment l1 and the line segment l2, first, the position D1 in the depth direction of the first bent portion a1 as the start point of the line segment l1, and the depth direction of the first bent portion a2 as the end point The depth relationship with the position D2 is depth D1> depth D2, and the start point side is larger than the end point side. On the other hand, the magnitude relationship between the depth D2 of the first bent portion a2 serving as the start point of the line segment l2 and the position D3 of the first bent portion a3 serving as the end point in the depth direction. Is such that depth D2 <depth D3, and the start point side is smaller than the end point side.

  As described above, in the line segment l1 and the line segment l2, the magnitude of the depth between the position in the depth direction of the first bent portion serving as the start point and the position in the depth direction of the first bent portion serving as the end point is determined. The relationship is reversed, with the line segment l1 and the line segment l2 being inclined in different directions. Similarly, the line segment l2 and the line segment l3 are inclined in different directions.

  Accordingly, in the present embodiment, the direction in which the timing of exiting from the first bent portion of the blade between the two small blocks in the first pair of small blocks (small blocks 144 and 145) and the direction following the direction are shifted. The direction in which the timing at which the blade leaves the first bent portion between the two small blocks in the second set of adjacent small blocks (small blocks 145 and 146) is reversed. Further, the direction of shifting the timing of the blade coming out of the first bent portion between the two small blocks in the second set of adjacent small blocks (small blocks 145 and 146) is followed by the third adjacent small block. The direction of shifting the timing at which the blade leaves the first bent portion between the two small blocks in the set of small blocks (small blocks 146 and 147) is reversed.

  The positions D1 to D4 in the depth direction of the first bent portions a1 to a4 of each sipe are as follows: position D2 is a position shallower than D1, position D3 is a position deeper than D2, and position D4 is a position shallower than D3. It has become. As described above, the position in the depth direction of the first bent portion a1 to a4 of each sipe does not change in the same direction in the tire circumferential direction, but changes in a different direction between adjacent sipes. ing.

  As described above, in the present embodiment, the timing at which the two small blocks exit the first bent portion of the blade forming the sipe is shifted not between all the small blocks but between two adjacent small blocks. I just need. Therefore, in the present embodiment, it is possible to control the hook removal timing of the small block with a high degree of freedom. That is, the position in the depth direction of the first bent portion (the bent portion at the lowest position) of each sipe can be set with a high degree of freedom.

  In the present embodiment, the positions of the first bent portions at the shallowest positions in the depth direction are different between adjacent sipes, but depending on the occurrence state of the peak value of the pullout force. Only one sipe may be different from the other sipe in the depth direction position of the first bent portion at the shallowest position. Also in this case, an effect of suppressing the peak value of the pull-out force can be obtained as compared with the conventional example.

  Next, a second embodiment will be described with reference to FIGS. FIG. 4 is a diagram showing a layout example of sipes in the second embodiment (a diagram showing a cross section of a land block along a tire circumferential direction). FIG. 6 is a diagram illustrating a prediction result of a pull-out force according to the second embodiment. Portions having the same names as those in the first embodiment are denoted by the same reference numerals. Here, the description will focus on the differences from the first embodiment.

  In the second embodiment, the bent portions a1 to a4 at the shallowest positions of the sipes 151 to 154 formed in the land block 14 are all different in the depth direction positions D1 to D4. In the embodiment, the relationship of depth D2 <depth D4 <depth D3 <depth D1 is satisfied. Thereby, at the time of hook removal after tire vulcanization, in each blade forming the sipes 151 to 154, each first bent portion of each blade forming the first bent portions a1 to a4 is Can be shifted at all times.

  In other words, in the small blocks 144 to 147, the timing at which the small block 144 exits from the first bent portion of the blade forming the sipe 151 and the timing at which the small block 145 exits from the first bent portion of the blade forming the sipe 152 The timing at which the small block 146 exits the first bent portion of the blade forming the sipe 153 and the timing at which the small block 147 exits the first bent portion of the blade forming the sipe 154 can be all shifted. .

  Therefore, in the present embodiment, not only the adjacent small blocks in the land block but also each of the small blocks 144 to 147 can shift the timing at which the small blocks 144 to 147 come off from the first bent portion of the shuttle blade in the manufacturing process. it can. As a result, even when the present embodiment includes a sipe having a bent portion in the tire radial direction, it is possible to further suppress the peak value of the pull-out force at the time of the hook pull-out as compared with the first embodiment. And yield can be further improved.

  FIG. 6 shows a calculation result of the prediction of the pull-out force by the finite element method (FEM) when the present embodiment is used. In the present embodiment, it was confirmed that the pull-out force peak value was reduced by 23% as compared with the conventional tire in which the positions in the depth direction of the bent portions at the shallowest positions of the respective sipes were all the same.

  Moreover, after vulcanizing the tire raw material rubber using a mold (mold) corresponding to one sector of a tread pattern (a pattern similar to FIG. 1 in a tread view) of the tire of the present embodiment, the mold is pulled out. The force peak was measured. Similarly, after vulcanizing the tire raw rubber using a mold corresponding to one sector of the tread pattern in the conventional tire in which the positions in the depth direction of each bent portion at the shallowest position of each sipe are all the same. The peak value of the pull-out force of the mold was measured. As a result, assuming that the conventional pulling force peak value of the tread pattern mold is 100, the pulling force peak value of the tread pattern mold of the present embodiment is 85, and in this embodiment, the pulling force (hook pullout force) is Force) A reduction effect of 15% of the peak value was obtained.

  Here, a line segment connecting the first bent portions at the shallowest position in the adjacent sipes in the sipes 151 to 154, that is, the first bent portions a1 and a2, and the first bent portions a2 and a3. And the line segments connecting the first bent portions a3 and a4 are referred to as line segments l1, l2 and l3, respectively. In the present embodiment, similarly to the first embodiment, the line segments l1, l2, and l3 are arranged in the direction in which the sipes 151 to 154 are lined up on the surface (tread surface) 14k of the land block 14 between adjacent line segments ( Here, it is inclined in different directions with respect to the tire circumferential direction).

  Accordingly, in the present embodiment, the direction in which the timing of exiting from the first bent portion of the blade between the two small blocks in the first pair of small blocks (small blocks 144 and 145) and the direction following the direction are shifted. The direction in which the timing at which the blade leaves the first bent portion between the two small blocks in the second set of adjacent small blocks (small blocks 145 and 146) is reversed. Further, the direction of shifting the timing of the blade coming out of the first bent portion between the two small blocks in the second set of adjacent small blocks (small blocks 145 and 146) is followed by the third adjacent small block. The direction of shifting the timing at which the blade leaves the first bent portion between the two small blocks in the set of small blocks (small blocks 146 and 147) is reversed.

  The positions D1 to D4 in the depth direction of the first bent portions a1 to a4 of each sipe are all different, but the positional relationship of the first bent portion between adjacent sipes is the same as in the first embodiment. The position D2 is a position shallower than the position D1, the position D3 is a position deeper than the position D2, and the position D4 is a position shallower than the position D3. As described above, the position in the depth direction of the first bent portion a1 to a4 of each sipe does not change in the same direction in the tire circumferential direction, but changes in a different direction between adjacent sipes. ing.

  As described above, in this embodiment, the timing at which each small block exits the first bent portion of the blade forming the sipe does not have to be shifted in the same direction between all the small blocks. The timing control can be performed with a certain degree of freedom as compared with the case where the timing is shifted in the same direction. That is, the position in the depth direction of the first bent portion (the shallowest bent portion) of each sipe can be set to a certain degree of freedom as compared with the case where the position is shifted in the same direction.

  Next, a third embodiment will be described with reference to FIG. FIG. 5 is a diagram showing a layout example of sipes in the third embodiment (a diagram showing a cross section of the land block along the tire circumferential direction), and the same reference numerals are assigned to the same names as those in the first embodiment. . Here, the description will focus on the differences from the first embodiment.

  In the third embodiment, similarly to the second embodiment, the bent portions a1 to a4 at the shallowest positions of the sipes 151 to 154 formed in the land block 14 are located at positions D1 to D4 in the depth direction. (However, this embodiment is different from the second embodiment in the relationship between the depths of the positions D1 to D4, and has the relationship of depth D4 <depth D3 <depth D2 <depth D1). . In the present embodiment, the first bent portions a1 to a4 are formed in the respective blades forming the sipes 151 to 154 at the time of the hook removal after the vulcanization of the tire, because the positions D1 to D4 in the depth direction are all different. The timing at which each first bent portion of each blade exits the land block 14 can be all shifted.

  In other words, in the small blocks 144 to 147, the timing at which the small block 144 exits from the first bent portion of the blade forming the sipe 151 and the timing at which the small block 145 exits from the first bent portion of the blade forming the sipe 152 The timing at which the small block 146 exits the first bent portion of the blade forming the sipe 153 and the timing at which the small block 147 exits the first bent portion of the blade forming the sipe 154 can be all shifted. .

  Therefore, in the present embodiment, not only the adjacent small blocks in the land block but also each of the small blocks 144 to 147 can shift the timing at which the small blocks 144 to 147 come off from the first bent portion of the shuttle blade in the manufacturing process. it can. As a result, even when the present embodiment includes a sipe having a bent portion in the tire radial direction, it is possible to further suppress the peak value of the pull-out force at the time of the hook pull-out as compared with the first embodiment. And yield can be further improved.

  Here, a line segment connecting the first bent portions at the shallowest position in the adjacent sipes in the sipes 151 to 154, that is, the first bent portions a1 and a2, and the first bent portions a2 and a3. And the line segments connecting the first bent portions a3 and a4 are referred to as line segments l1, l2 and l3, respectively. In the present embodiment, the line segments l1, l2, and l3 are all in the same direction with respect to the direction in which the sipes 151 to 154 are lined up (here, the tire circumferential direction) on the surface (tread surface) 14k of the land block 14. It is inclined. Here, the inclination in the same direction (the same inclination direction) means that, in the line segments, the position Dn in the depth direction of the first bent portion an as the starting point and the first bent portion an as the end point in the line segments This means that the magnitude relationship of the depth with the position Dn + 1 in the depth direction of +1 is the same. For example, in the line segment l1 and the line segment l2, first, the position D1 in the depth direction of the first bent portion a1 as the start point of the line segment l1, and the depth direction of the first bent portion a2 as the end point The depth relationship with the position D2 is depth D1> depth D2, and the start point side is larger than the end point side. Next, the depth relationship between the position D2 in the depth direction of the first bent portion a2 serving as the start point of the line segment l2 and the position D3 in the depth direction of the first bent portion a3 serving as the end point is expressed by: Depth D2> Depth D3, where the start point side is also larger than the end point side. As described above, in the line segment l1 and the line segment l2, the magnitude of the depth between the position in the depth direction of the first bent portion serving as the start point and the position in the depth direction of the first bent portion serving as the end point is determined. The relationship is the same (in this case, the start point side is larger than the end point side), and the line segment l1 and the line segment l2 are inclined in the same direction. Similarly, both the line segment l2 and the line segment l3 are inclined in the same direction.

  Accordingly, in the present embodiment, the direction in which the timing of exiting from the first bent portion of the blade between the two small blocks in the first pair of small blocks (small blocks 144 and 145) and the direction following the direction are shifted. The direction in which the timing at which the blade exits from the first bent portion between the two small blocks in the second set of adjacent small blocks (small blocks 145 and 146) is the same. Further, the direction of shifting the timing of the blade coming out of the first bent portion between the two small blocks in the second set of adjacent small blocks (small blocks 145 and 146) is followed by the third adjacent small block. The direction in which the timing at which the blade leaves the first bent portion between the two small blocks in the set of small blocks (small blocks 146 and 147) is the same.

  Further, the depth positions D1 to D4 of the first bent portions a1 to a4 of each sipe have a relationship of depth D4 <depth D3 <depth D2 <depth D1. As described above, the positions in the depth direction of the first bent portions a1 to a4 of each sipe change in the same direction in the tire circumferential direction.

  Therefore, in the present embodiment, when the shuttle is pulled out, the small blocks 144 to 147 arranged in the tire circumferential direction are sequentially shifted in the same direction in the order in which the small blocks 144 to 147 are removed from the first bent portion of the blade forming the sipe. To go. Thus, in the present embodiment, each small block is more easily removed from each blade of the shuttle, and the pulling force itself when the shuttle is removed can be reduced. Therefore, in this embodiment, in addition to the effect of suppressing the peak value of the pull-out force by shifting the timing at which each small block comes out of the first bent portion of the blade between the small blocks, the pull-out force itself at the time of hook removal Can be reduced, the effect of suppressing the peak value can be obtained, and the pull-out force peak value at the time of the hook pull-out can be further suppressed than in the second embodiment.

  In the first to third embodiments, the sipe 15 extends along the tire width direction on the surface of the land block 14, but the sipe 15 extends in the tire circumferential direction on the surface of the land block 14. It may extend along.

  The embodiments of the present invention have been described above. However, these embodiments are merely exemplifications described for facilitating the understanding of the present invention, and the present invention is not limited to the embodiments. The technical scope of the present invention is not limited to the specific technical items disclosed in the above embodiments, but also includes various modifications, changes, and alternative technologies that can be easily derived therefrom.

11 Tread 12 Circumferential groove 13 Lateral groove (lug groove)
14 Land block 14k Surface (land surface) of land block
15, 151 to 154 Sipe 15p First inclined portion 15q Second inclined portion 15r Third inclined portion a1 to a4 First bent portion (bent portion at the lowest position)
b1 to b4 Second bent portion c1 to c4 Sipe shallowest part e1 to e4 Sipe deepest part l0 Tire radial direction l1 to l3 line segment

Claims (1)

On the surface of the tread, an intersecting groove, a land block defined by the groove, and a plurality of three or more sipes having a bent portion in the tire radial direction formed in the land block,
When the tire radial direction inner side from the tread of the land block is the depth direction,
Among the plurality of sipes, adjacent sipes have different positions in the depth direction of the bent portions at their respective shallowest positions,
A plurality of line segments connecting the bent portions at the shallowest position in the adjacent sipe of the plurality of sipes are arranged in the adjacent line segments, and the plurality of sipes on the tread surface of the land block are arranged. A tire characterized by being inclined in different directions with respect to the direction .

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