JP7178962B2 - pneumatic tire - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire with performance on ice and snow.

A studless tire designed for performance on ice and snow has a traction pattern in which the tire tread is partitioned by circumferential grooves and the circumferentially continuous land is divided into multiple blocks by widthwise grooves, with sipes formed in each block. well known.

The sipe absorbs water to eliminate the water film that forms between the road surface and the tire, and the edge of the sipe cuts through the water film on the road surface and comes into direct contact with the road surface, thereby improving traction.

By increasing the number of sipes formed in the block, the edge component in the block increases and the performance on ice and snow can be improved.
However, when the number of sipes increases, the divided blocks divided by the sipes in the block become smaller, the rigidity is low, and the divided blocks on the outside in the tire circumferential direction are particularly prone to breakage due to deformation during vehicle running.

Therefore, two sipes are concentrated in the central portion of the block in the tire circumferential direction to secure an edge component due to the sipes, and the two sipes concentrated in the central portion form a large block on the outside of the two tire circumferential directions. There is an example in which an outer divided block and a small central divided block are divided, and the outer divided block is made as large as possible to maintain rigidity and prevent damage during vehicle travel (see Patent Document 1).

JP-A-2008-149768

In order to further improve the performance on snow and ice of the pneumatic tire disclosed in Patent Document 1, it is sufficient to increase the number of sipes for the block and increase the edge component. The challenge is to maintain the size of the divided blocks and suppress the loss of blocks.
In addition, depending on the increased sipe, the rigidity of the dividing block is lowered, and deformation at the time of contact with the ground is increased, which may cause bottom cracks in the groove bottom of the sipe.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to provide a pneumatic tire that has improved performance on ice and snow and that suppresses chipping of blocks and cracking of groove bottoms of sipes. .

In order to achieve the above object, the present invention
forming a plurality of circumferentially continuous land portions partitioned by a plurality of circumferential grooves extending in the tire circumferential direction in the tread of the tire;
Among the circumferential grooves, the inner land portion of the land portions positioned inward in the tire width direction from the outermost circumferential groove in the tire width direction is formed by a circumferential narrow groove extending in the tire circumferential direction. divided in the direction to form two rows of divided land portions,
The divided land portion is partitioned into a plurality of blocks by a plurality of width direction grooves extending in the tire width direction,
The two rows of divided land portions adjacent to each other with the circumferential narrow groove interposed therebetween are staggered such that the blocks formed respectively are out of phase with each other in the tire circumferential direction and partly overlap alternately in the tire circumferential direction. In a pneumatic tire located
At least three width-direction sipes extending in the tire width direction are formed in the block intensively at the central portion of the block in the tire circumferential direction,
The width direction sipes are opened on both side surfaces of the block in the tire width direction,
Among the circumferential grooves, the inner circumferential grooves other than the outermost circumferential grooves have a groove width narrower than that of the outermost circumferential grooves, and have a groove width that allows the inner land portions to come into contact with each other when grounded. To provide a pneumatic tire characterized by:

According to this configuration, three width direction sipes, which are sipes with openings on both sides extending in the tire width direction, are formed in one block, so that edge components are increased from the two width direction sipes, and performance on ice and snow can be further improved. can.
Among the circumferential grooves, the inner circumferential grooves other than the outermost circumferential grooves have a groove width narrower than that of the outermost circumferential grooves, and have a groove width that allows the inner land portions to come into contact with each other during ground contact. The inner land portion and the inner land portions on both sides are in contact with each other, and the multiple inner land portions are integrated to increase the overall rigidity. However, large deformation can be suppressed, and occurrence of bottom cracks in the groove bottom of the widthwise sipe can be suppressed.

In addition, since at least three widthwise sipes extending in the tire widthwise direction are formed in the blocks partitioned by the plurality of widthwise grooves of the divisional land portion intensively at the central portion of the block in the tire circumferential direction, At least three sipes concentrated in the central portion divide the blocks into two large outer divided large blocks and small inner divided small blocks on the outer side in the tire circumferential direction, and the outer divided large blocks are made as large as possible to maintain rigidity, When grounded, the outer divided large blocks are in contact with the adjacent blocks through the narrow circumferential grooves to further increase the rigidity, thereby suppressing the damage of the outer divided large blocks when the vehicle is running.

In a preferred embodiment of the invention,
Of the at least three width direction sipes, the outermost two outer width direction sipes and the inner width direction sipe between the two outer width direction sipes have the same depth in the tire radial direction.

According to this configuration, the two outer width direction sipes and the inner width direction sipe between them have the same depth in the tire radial direction. Bottom cracks are not likely to occur at the bottom of the groove.

In a preferred embodiment of the invention,
The circumferential groove extends in a zigzag shape in the tire circumferential direction while swaying in the tire width direction,
The block has a center in the tire circumferential direction that is bent to match the zigzag shape of the circumferential groove,
The inner width direction sipe is formed at the bent portion of the block.

According to this configuration, the center of the block in the tire circumferential direction is bent in accordance with the zigzag shape of the circumferential groove, and the inner width direction sipe is formed in this bent portion, so that two tire circumferential direction sipes are formed. Since the outside divided blocks are divided into approximately equal sizes to maintain the rigidity, it is possible that one of the outer divided blocks will be smaller than the other, reducing rigidity and causing damage during vehicle running. do not have.

In a preferred embodiment of the invention,
The block is bent at the center in the tire circumferential direction so that the side surface of the zigzag shape on the side of the circumferential groove protrudes.

According to this configuration, since the block is bent at the center in the tire circumferential direction so that the zigzag-shaped circumferential groove side surface protrudes, the inner width direction sipe of the bent portion and the outer widths of both sides thereof are bent. The directional sipe has an opening on the side surface of the block protruding on the side of the circumferential groove, and can easily discharge the water absorbed when the block touches the ground to the circumferential groove, thereby improving the drainage performance.

In the present invention, at least three widthwise sipes extending in the tire widthwise direction are formed concentratedly at the central portion of the block in the tire circumferential direction in the blocks partitioned by the plurality of widthwise grooves of the divided land portion. Therefore, at least three sipes are used to further increase the edge component and improve performance on ice and snow, and at least three sipes concentrated in the center divide the block into two blocks, one on the outer side in the circumferential direction of the tire, and the other on the inner side. It is possible to divide into blocks and maintain the rigidity by making the outer divided block as large as possible to suppress damage during vehicle running.

In addition, among the circumferential grooves, the inner circumferential grooves other than the outermost circumferential grooves have a groove width narrower than that of the outermost circumferential grooves, so that the inner land portions can contact each other when grounded, so that a small inner dividing block can be formed. Even if a large amount of ground pressure is received, the rigidity of the inner dividing block is secured by contacting the adjacent blocks, which prevents the inner dividing block from significantly deforming and causes bottom cracks at the groove bottom of the width direction sipe. can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a tire width direction sectional drawing of the pneumatic tire which concerns on one embodiment of this invention. It is a partial plan view of the tread of the same pneumatic tire. It is a partially enlarged plan view of an inner land portion of the tread. 4 is a partial cross-sectional view of the inner land portion taken along the IV-IV arrow in FIG. 3; FIG. 4 is a partial cross-sectional view of the same tread taken along line VV in FIG. 3; FIG.

An embodiment according to the present invention will be described below with reference to FIGS. 1 to 5. FIG.
FIG. 1 is a cross-sectional view in the tire width direction of a pneumatic tire 1 that is a heavy-duty radial tire for trucks and buses according to the present embodiment (cross-sectional view taken along a plane including the tire rotation center axis).

The pneumatic tire 1 has a toroidal shape by winding both side edges around a pair of left and right bead rings 2, 2 each formed by winding a metal wire in a ring shape, so that the area between the both side edges bulges outward in the tire radial direction. A carcass ply 3 is formed.

An air permeable inner liner portion 4 is formed on the inner surface of the carcass ply 3 .
A plurality of belts 6 are wound on the outer periphery of the crown portion of the carcass ply 3 to form a belt layer 5, and a tread 7 is formed to cover the outer side in the tire radial direction.
The belt layer 5 is formed by stacking belts 6 in a plurality of layers, and each belt 6 is formed by covering a belt cord with belt rubber to form a strip.

Sidewall portions 8 are formed on the outer surfaces of both side portions of the carcass ply 3 .
A bead portion 9 covering an annular end wound around the bead ring 2 of the carcass ply 3 and folded back continues to the inner liner portion 4 on the inside and to the sidewall portion 8 on the outside.

FIG. 2 is a partial plan view of the tread 7, showing the portion of the tread that contacts the road surface when the tire touches the ground. between.
1 and 2, the tread 7 has two circumferential grooves 11i and 11o extending in the tire width direction on both sides of the tire equator line Le at the center in the tire width direction. They are formed at approximately equal intervals.

The four circumferential grooves 11o, 11i, 11i, 11o are the inner circumferential grooves 11i, 11i on the inner side in the tire width direction near the tire equator Le, and the outermost outermost groove in the tire width direction of the inner circumferential groove 11i. and an outer circumferential groove 11o.
Both of the circumferential grooves 11i and 11o extend in a zigzag shape in the tire circumferential direction while swaying in the tire width direction.

Five land portions 12C, 12B, 12A, 12B, and 12C are defined by the four circumferential grooves 11o, 11i, 11i, and 11o and extend in the tire circumferential direction.
Three inner land portions 12B, 12A, 12B are defined inside the tire equator line Le between the outermost circumferential grooves 11o, 11o on both sides in the tire width direction.
A shoulder land portion 12C is defined in the tire shoulder region outside the outermost circumferential groove 11o in the tire width direction.

Of the circumferential grooves 11i and 11o, the inner circumferential grooves 11i other than the outermost circumferential groove 11o have a groove width narrower than that of the outermost circumferential groove 11o. , 12B are groove widths that can be in contact with each other.

The inner land portions 12A and 12B are divided in the tire width direction by circumferential narrow grooves 13 extending in a zigzag shape in the tire circumferential direction while swaying in the tire width direction at the center in the tire width direction, thereby forming two rows of divided land portions 12p and 12q. is formed.

The divided land portions 12p and 12q are partitioned into a plurality of blocks 15P and 15Q by a plurality of widthwise grooves 14 provided at equal intervals in the tire circumferential direction and extending in the tire width direction.
The width direction groove 14 has a large groove width, and the depth in the tire radial direction is about half the depth of the circumferential grooves 11i and 11o.

Blocks 15P and 15Q formed in two rows of divided land portions 12p and 12q which are adjacent to each other with the circumferential narrow groove 13 interposed therebetween are arranged such that blocks 15P and 15Q are shifted in the tire circumferential direction and partly overlapped alternately in the tire circumferential direction. located in a staggered pattern.

The blocks 15P and 15Q are bent at the center in the tire circumferential direction in accordance with the zigzag shape of the circumferential groove 11i (or the circumferential groove 11o) and the circumferential narrow groove 13. As shown in FIG.
The blocks 15P and 15Q are bent at the center in the tire circumferential direction so that the side surfaces 15Ps and 15Qs on the side of the zigzag-shaped circumferential groove 11i (or the circumferential groove 11o) protrude (see FIG. 3).

Three widthwise sipes 16a, 16m, 16z extending in the widthwise direction of the tire are formed concentrating on bent portions at the centers of the blocks 15P, 15Q in the tire circumferential direction.
The widthwise sipes 16a, 16m, 16z are cuts with a groove width of less than 1.0 mm.

Of the width direction sipes 16a, 16m, 16z, the outermost two outer width direction sipes 16a, 16z and the inner width direction sipe 16m formed between the two outer width direction sipes 16a, 16z are arranged in the tire radial direction. are the same and substantially the same as the depth of the width direction groove 14 (see FIG. 5).
An inner width direction sipe 16m is formed at the bent portion of the blocks 15P and 15Q at the center in the tire circumferential direction.

The three width direction sipes 16a, 16m, 16z are double-side open sipes that are open on both side surfaces of the blocks 15P, 15Q in the tire width direction.
That is, the widthwise sipes 16a, 16m, and 16z have one end opened in the circumferential groove 11i (or the circumferential groove 11o) and the other end opened in the circumferential narrow groove 13 to form the circumferential groove 11i (or the circumferential groove 11o). The groove 11o) and the circumferential narrow groove 13 are communicated with each other.

Therefore, referring to FIG. 3, the block 15P is an outer divided large block having a long outer block length in the tire circumferential direction (the length of the block in the tire circumferential direction) due to the width direction sipes 16a, 16m, and 16z which are sipes with openings on both sides. It is divided into 15Pa, 15Pz and inner divided small blocks 15Pm, 15Pn having a short block length between the outer divided large blocks 15Pa, 15Pz.
Similarly, the blocks 15Q are composed of large outer divided large blocks 15Qa and 15Qz with long block lengths on the outer side in the tire circumferential direction due to width direction sipes 16a, 16m, and 16z, and inner side blocks with short and small block lengths between the outer large divided blocks 15Qa and 15Qz. It is divided into divided small blocks 15Qm and 15Qn.

Here, since the widthwise sipes 16a, 16m, 16z are narrow cuts with a groove width of less than 1.0 mm, the blocks on both sides of the widthwise sipes 16a, 16m, 16z are pressed and deformed and come into contact with each other when grounded. be able to.

That is, when grounded, the outer divided large block 15Pa, the inner divided small blocks 15Pm, 15Pn, the outer divided large block 15Pz, the outer divided large block 15Qa, and the inner divided small block 15Qm are divided by the three widthwise sipes 16a, 16m, 16z. , 15Qn, and the outer divided large blocks 15Qz are pressed and deformed to be in contact with each other, and the blocks 15P and 15Q can be integrated into one to increase the rigidity.

Furthermore, the groove width of the circumferential fine groove 13 is the same as or slightly larger than that of the widthwise sipes 16a, 16m, and 16z. The block 15P and the block 15Q thus formed are pressed and deformed to be continuously meshed with each other, so that the rigidity in the tire circumferential direction can be improved.

Referring to FIG. 2, the shoulder land portion 12C on the outer side in the tire width direction from the outermost circumferential groove 11o is connected to the inner shoulder land portion 12Ci on the inner side in the tire width direction by a circumferential narrow groove 21 linearly extending in the tire circumferential direction. It is divided into an outer shoulder land portion 12Co on the outer side in the tire width direction.
The inner shoulder land portion 12Ci has a larger width in the tire width direction and higher rigidity than the outer shoulder land portion 12Co.

The inner shoulder land portion 12Ci is partitioned into a plurality of inner blocks 23 by inner width direction lug grooves 22 provided at equal intervals in the tire circumferential direction and extending in the tire width direction.
The depth in the tire radial direction of the inner width direction lug grooves 22 is half the depth in the tire radial direction of the outermost circumferential grooves 11o.

The inner block 23 is formed with an inner width direction narrow groove 24 extending in the tire width direction at the central portion in the tire circumferential direction.
The inner width direction narrow groove 24 is a double-sided open sipe with one end opening at 11o and the other end opening at the circumferential direction narrow groove 21, and the depth in the tire radial direction is the same as the inner width direction lug groove 22. .

Therefore, the inner block 23 is divided into small blocks with short block lengths by the inner width direction narrow grooves 24 .
Although the inner width direction narrow groove 24 has a groove width slightly larger than that of the sipe, when the tire touches the ground, the small blocks on both sides of the inner width direction narrow groove 24 are press-deformed and come into contact with each other.

The outer shoulder land portion 12Co, which is defined on the outer side in the tire width direction by the circumferential narrow grooves 21 of the shoulder land portion 12C, has a plurality of outer width direction lug grooves 32 extending in the tire width direction provided at equal intervals in the tire circumferential direction. It is partitioned into outer blocks 33 .
The outer side of the outer block 33 in the tire width direction is the tire contact edge E. As shown in FIG.

The outer width direction lug grooves 32 have a large groove width, and the depth in the tire radial direction is substantially the same as the depth in the tire radial direction of the inner width direction lug grooves 22 .
The outer widthwise lug grooves 32 are formed at the same positions as the inner widthwise lug grooves 22 in the tire circumferential direction.
Therefore, since the inner widthwise lug grooves 22 and the outer widthwise lug grooves 32 in the shoulder land portion 12C are formed at the same position in the tire circumferential direction, the drainage performance of the shoulder land portion 12C is improved.

The embodiment of the pneumatic tire according to the present invention, which has been described in detail above, has the following effects.
2 and 3, the inner land portions 12A and 12B located inside the outermost circumferential grooves 11o in the tread 7 of the pneumatic tire 1 are formed by the circumferential narrow grooves 13 to extend the width of the tire. It is divided in the direction into two rows of divided land portions 12p and 12q.

In block 15P (15Q), three width direction sipes 16a, 16m, 16z extending in the tire width direction are concentrated in the center of block 15P (15Q) in the tire circumferential direction. The block 15P (15Q) is formed by the three width direction sipes 16a, 16m, and 16z, and the two outer divided large blocks 15Pa, 15Pz (15Qa, 15Qz) with a long block length and a small block with a short block length are formed on the outer side of the tire circumferential direction. It is divided into inner divided small blocks 15Pm and 15Pn (15Qm and 15Qn).

Three width direction sipes 16a, 16m and 16z, which are openings on both sides extending in the width direction of the tire, are formed in one block 15P (15Q), so the edge component is increased from the two width direction sipes, and performance on ice and snow is further improved. can be made

When grounded, the outer divided large blocks 15Pa, 15Pz (15Qa, 15Qz) and the inner divided small blocks 15Pm, 15Pn (15Qm, 15Qn), which are divided into widthwise sipes 16a, 16m, 16z, are in contact with adjacent blocks, but the rigidity When the ground pressure is concentrated on the inner divided small blocks 15Pm, 15Pn (15Qm, 15Qn) with low , the inner divided small blocks 15Pm, 15Pn (15Qm, 15Qn) are likely to be greatly deformed.

In the present pneumatic tire 1, as shown in FIG. 2, among the circumferential grooves 11i and 11o, the inner circumferential grooves 11i other than the outermost circumferential groove 11o have a groove width greater than that of the outermost circumferential groove 11o. Since the width of the groove is narrow enough to allow the inner land portions 12A and 12B to contact each other when grounded, the inner land portion 12A and the inner land portions 12B and 12B on both sides of the inner land portion 12A and the inner land portions 12B and 12B are brought into contact with each other when the ground is touched to form the inner land portions 12B, 12A and 12B. Since the overall rigidity is increased by integration, even if the small inner divided small blocks 15Pm, 15Pn (15Qm, 15Qn) divided by the width direction sipes 16a, 16m, 16z receive a large ground pressure, they will not be greatly deformed. is suppressed, and the occurrence of bottom cracks in the groove bottoms of the widthwise sipes 16a, 16m, and 16z can be suppressed.

Of the widthwise sipes 16a, 16m, and 16z, the outermost two outer widthwise sipes 16a and 16z and the inner widthwise sipe 16m between the two outer widthwise sipes 16a and 16z have a depth in the tire radial direction. Therefore, neither the outer width direction sipes 16a, 16z nor the inner width direction sipe 16m is particularly susceptible to bottom cracks at the groove bottom.

2 and 3, three width direction sipes 16a, 16m, and 16z concentrated in the central portion divide the block 15P (15Q) into two large outside large blocks 15Pa, 15Pa, 15Pa, 15Q, 15P, 15Q, 15P, 15Q, 15Q, 15Q, 15P, 15Q, 15Q, 15P, 15Q, 15P, 15P, 15Q, 15P, 15Q, 15P, 15P, 15P, 15P, 15P, 15Q, 15P, 15Q, 15P, 15Q, and 15Q, respectively. Divide into 15Pz (15Qa, 15Qz) and small inner divided small blocks 15Pm, 15Pn (15Qm, 15Qn), outer divided large blocks 15Pa, 15Pz (15Qa, 15Qz) as large blocks as possible to maintain rigidity, and outside when grounding The large divided blocks 15Pa, 15Pz (15Qa, 15Qz) are in contact with the adjacent blocks 15P (15Q) through the narrow circumferential grooves 11i to further increase the rigidity. Deficiency of 15Pz (15Qa, 15Qz) can be suppressed.

As shown in FIGS. 2 and 3, the circumferential grooves 11i and 11o extend in a zigzag shape in the tire circumferential direction while swaying in the tire width direction. It is bent according to the zigzag shape of the grooves 11i and 11o, and since the inner width direction sipe 16m is formed at this bent portion, the two outer divided large blocks 15Pa and 15Pz (15Qa and 15Qz) on the outer side in the tire circumferential direction are formed. Since the blocks are divided substantially evenly into appropriate sizes to maintain rigidity, one outer large block becomes smaller than the other outer large block, reducing rigidity and causing damage when the vehicle is running. no.

The blocks 15P and 15Q are bent at the center in the tire circumferential direction so that the side surfaces of the zigzag-shaped circumferential grooves 11i and 11o protrude. The widthwise sipes 16a, 16z have openings on the side surfaces of the protruding circumferential grooves 11i, 11o of the blocks 15P, 15Q, so that the water absorbed during grounding can be easily discharged to the circumferential grooves 11i, 11o. , can improve drainage.

Although the pneumatic tire according to one embodiment of the present invention has been described above, the aspect of the present invention is not limited to the above embodiment, and can be implemented in various aspects within the scope of the gist of the present invention. includes things.

For example, the inner width direction sipe sandwiched between the two outer width direction sipes 16a and 16z of the blocks 15P and 15Q is not limited to one, and two or more inner width direction sipes are formed to increase the edge component. However, since the inner divided small blocks divided by the inner width direction sipes also require a certain degree of rigidity, the inner width direction sipes cannot be formed so many.

The pneumatic tire of the present invention can be applied not only to tires for trucks and buses, but also to tires for passenger cars.

DESCRIPTION OF SYMBOLS 1... Pneumatic tire 2... Bead ring 3... Carcass ply 4... Inner liner part 5... Belt layer 6... Belt 7... Tread 8... Side wall part 9... Bead part
11i... inner circumferential groove, 11o... outermost circumferential groove,
12A, 12B... Inner land portion, 12C... Shoulder land portion, 12Ci... Inner shoulder land portion, 12Co... Outer shoulder land portion,
12p, 12q: Divided land portion, 13: Circumferential narrow groove, 14: Width direction groove,
15P... block, 15Pa, 15Pz... outer divided large block, 15Pm, 15Pn... inner divided small block,
15Q... block, 15Qa, 15Qz... outer divided large block, 15Qm, 15Qn... inner divided small block,
16a, 16z... Outside width direction sipe, 16m... Inside width direction sipe,
21...Circumferential narrow groove,
22... Inner widthwise lug grooves, 23...Inner block, 24...Inner widthwise narrow grooves,
32... Outer width direction lug groove, 33... Outer block.

Claims (4)

A plurality of circumferentially continuous land portions (12A, 12B, 12C) defined by a plurality of circumferential grooves (11i, 11o) extending in the tire circumferential direction are formed in the tread of the tire,
The inner land portion among the land portions (12A, 12B, 12C) positioned inward in the tire width direction from the outermost circumferential groove (11o) of the circumferential grooves (11i, 11o) in the tire width direction. The portions (12A, 12B) are divided in the tire width direction by circumferential narrow grooves (13) extending in the tire circumferential direction to form two rows of divided land portions (12p, 12q),
The divided land portions (12p, 12q) are partitioned into a plurality of blocks (15P, 15Q) by a plurality of widthwise grooves (14) extending in the tire width direction,
Two rows of divided land portions (12p, 12q) adjacent to each other across the circumferential narrow groove (13) have blocks (15P, 15Q) formed thereon that are partially out of phase with each other in the tire circumferential direction. In a pneumatic tire that is staggered so that the are alternately overlapped in the tire circumferential direction,
At least three widthwise sipes (16a, 16m, 16z) extending in the tire width direction are formed in the blocks (15P, 15Q) concentratedly at the center of the blocks (15P, 15Q) in the tire circumferential direction,
The width direction sipes (16a, 16m, 16z) are opened on both side surfaces of the blocks (15P, 15Q) in the tire width direction,
Of the circumferential grooves (11i, 11o), the inner circumferential groove (11i) other than the outermost circumferential groove (11o) has a groove width narrower than that of the outermost circumferential groove (11o). A pneumatic tire characterized by having a groove width that allows inner land portions (12A, 12B) to come into contact with each other. Outermost two outer widthwise sipes (16a, 16z) of at least three widthwise sipes (16a, 16m, 16z) and inner widthwise sipes (16a, 16z) between the two outer widthwise sipes (16a, 16z) The pneumatic tire according to claim 1, wherein the sipes (16m) have the same depth in the tire radial direction. The circumferential grooves (11i, 11o) extend in a zigzag shape in the tire circumferential direction while swaying in the tire width direction,
The blocks (15P, 15Q) are bent at their centers in the tire circumferential direction to match the zigzag shape of the circumferential grooves (11i, 11o),
The pneumatic tire according to claim 2, wherein the inner width direction sipe (16m) is formed at a bent portion of the block. 4. The block (15P, 15Q) according to claim 3, wherein the center in the tire circumferential direction is bent so that a side surface of the zigzag-shaped circumferential grooves (11i, 11o) protrudes. pneumatic tires.

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