JP2021091359A - Pneumatic tire - Google Patents

Abstract

To provide a pneumatic tire in which followability of a shoulder block with respect to a road surface can be improved.SOLUTION: In the pneumatic tire, a shoulder block comprises a plurality of sipes consecutively connected to land grooves. The plurality of sipes include a plurality of first sipes having a first width and a second sipe having a second width larger than the first width. The second sipe is arranged to be sandwiched between the plurality of first sipes in a tire circumferential direction.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to pneumatic tires.

Conventionally, for example, a pneumatic tire includes a plurality of inclined grooves inclined in the tire width direction and a plurality of land portions partitioned by the plurality of inclined grooves (for example, Patent Document 1). The land portion includes a land groove connecting the inclined grooves and a plurality of blocks partitioned by the land groove and arranged in the tire width direction.

The plurality of blocks include a shoulder block arranged on the outermost side in the tire width direction, and the shoulder block includes a plurality of sipes. By the way, in recent years, there has been a demand for a pneumatic tire capable of improving the followability of a shoulder block to a road surface.

Japanese Unexamined Patent Publication No. 2016-578

Therefore, an object of the present disclosure is to provide a pneumatic tire capable of improving the followability of the shoulder block to the road surface.

The pneumatic tire includes a plurality of inclined grooves extending outward from the tire equatorial line in the tire width direction and inclined with respect to the tire width direction, and a plurality of land portions partitioned by the plurality of inclined grooves. The land portion includes a land groove connecting the inclined grooves and a plurality of blocks partitioned by the land groove and arranged in the tire width direction, and the plurality of blocks are located most outward in the tire width direction. The shoulder block comprises a plurality of first sipe having a first width and a second sipe having a second width larger than the first width, including the shoulder block to be arranged. The two sipes are arranged so as to be connected to the land groove and sandwiched between the plurality of first sipes in the tire circumferential direction.

Development view of the main part of the tread surface of the pneumatic tire according to the embodiment Explanatory drawing of the first inclined side Explanatory drawing of the second inclined side Enlarged view of the shoulder block according to the same embodiment

Hereinafter, an embodiment of the pneumatic tire will be described with reference to FIGS. 1 to 4. In each drawing, the dimensional ratio of the drawings and the actual dimensional ratio do not always match, and the dimensional ratios between the drawings do not necessarily match.

As shown in FIG. 1, the pneumatic tire (hereinafter, also simply referred to as “tire”) 1 according to the present embodiment has a pair of bead portions (not shown) and each bead portion on the outside in the tire radial direction. It includes an extending sidewall portion (not shown) and a tread portion 2 which is connected to an outer end portion of a pair of sidewall portions in the tire radial direction and whose outer surface forms a tread surface 2a.

The tire 1 is mounted on a rim (not shown), and the inside of the tire 1 is pressurized by air. The use of the tire 1 is not particularly limited, but the tire 1 according to the present embodiment is a so-called all-season tire used on both a snowy road surface and a dry road surface.

In each figure, the first direction D1 is the tire width direction D1 parallel to the tire rotation axis, and the second direction D2 is the tire circumferential direction D2 which is the direction around the tire rotation axis. The tire radial direction is the radial direction of the tire 1.

The tire equatorial plane is a plane orthogonal to the tire rotation axis and is located at the center of the tire width direction D1, and the tire meridional plane is a plane including the tire rotation axis and is the tire equatorial plane. A surface orthogonal to a surface. The tire equator L1 is a line of the tire equator surface that intersects the tread surface 2a.

In the tire width direction D1, the inside is the side closer to the tire equator L1, and the outside is the side far from the tire equator L1. Further, of the tire width direction D1, one side D1a is referred to as a first width direction side D1a, and the other side D1b is referred to as a second width direction side D1b.

Of the tire circumferential directions D2, one side D2a is referred to as the first circumferential direction D2a, and the other side D2b is referred to as the second circumferential direction D2b. Although not particularly limited, in the present embodiment, the first circumferential direction side D2a is the rotation direction when the vehicle moves forward, that is, the rotation direction of the tire 1. As a result, in the present embodiment, the first circumferential direction side D2a is the stepping side, and the second circumferential direction side D2b is the kicking side.

Further, as shown in FIG. 2, the side toward the first circumferential direction D2a as it goes to the first width direction side D1a (and the side toward the second circumferential direction D2b as it goes to the second width direction side D1b). ) D3 is referred to as the first inclined side D3. Further, as shown in FIG. 3, the side toward the second circumferential direction D2b as it goes to the first width direction side D1a (and the side toward the first circumferential direction D2a as it goes to the second width direction side D1b). ) D4 is referred to as a second inclined side D4.

And, "the side that is inclined with respect to the tire width direction D1 is the same" means that it is the same inclined side (for example, the first inclined side D3, D3 and the second inclined side D4, D4). That is, even if the inclination angles with respect to the tire width direction D1 are different, if they are the same inclination sides D3 and D3 (D4, D4), they are included in "the inclination side with respect to the tire width direction D1 is the same".

Further, "the inclined side is opposite to the tire width direction D1" means that it is the opposite inclined side (first inclined side D3 and second inclined side D4). That is, even if the inclination angle with respect to the tire width direction D1 is the same, if it is the opposite inclination side D3 and D4, it is included in "the inclination side is opposite to the tire width direction D1".

Returning to FIG. 1, the tread surface 2a has a ground contact surface that touches the road surface, and the outer ends of the ground contact surface in the tire width direction D1 are referred to as ground contact ends 2b and 2b. Further, as the ground contact surface, the tire 1 is rim-assembled on the regular rim, the tire 1 is placed vertically on a flat road surface with the regular internal pressure charged, and the tread surface 2a that touches the road surface when a regular load is applied is provided. Point to.

A regular rim is a rim defined for each tire 1 in a standard system including a standard on which the tire 1 is based. For example, a standard rim for JATTA and a "Measuring Rim" for TRA and ETRTO. ..

The regular internal pressure is the air pressure defined for each tire 1 in the standard system including the standard on which the tire 1 is based. The maximum value described in "INFRATION PRESSURES", and in the case of ETRTO, it is "INFRATION PRESSURE". If the tire 1 is for a passenger car, it is set to 180 kPa, and if it is a tire 1 described as Extra Load or Reinforced, it is set to 220 kPa.

The normal load is the load defined for each tire 1 in the standard system including the standard on which the tire 1 is based. If it is JATTA, it is the maximum load capacity, and if it is TRA, it is the maximum described in the above table. If the value is ETRTO, it is "LOAD CAPACITY", but if the tire 1 is for a passenger car, it is set to 88% of the corresponding load of the internal pressure.

The tread portion 2 has a center main groove 3 arranged in the center of the tire width direction D1 and an inclined groove 4, which extends from the center main groove 3 toward the outside of the tire width direction D1 and is inclined with respect to the tire width direction D1. It has 5 and. Only one center main groove 3 is provided, and a plurality of inclined grooves 4 and 5 are provided.

The center main groove 3 extends in the tire circumferential direction D2. Specifically, the center main groove 3 extends parallel to the tire circumferential direction D2. The center main groove 3 is arranged on the tire equator L1. The center main groove 3 may be configured to extend in a zigzag shape along the tire circumferential direction D2. Further, the center main groove 3 may not be provided.

The inclined grooves 4 and 5 extend at least from the tire equator L1 to the ground contact end 2b. Specifically, the inclined grooves 4 and 5 extend from the center main groove 3 to at least the ground contact end 2b. The plurality of inclined grooves 4 and 5 are a first inclined groove 4 extending from the center main groove 3 toward the first width direction side D1a and a second inclined groove 4 extending from the center main groove 3 toward the second width direction side D1b. It includes an inclined groove 5.

The inclined grooves 4 and 5 extend toward the second circumferential direction D2b toward the outside of the tire width direction D1. Specifically, the first inclined groove 4 extends toward the outside of the tire width direction D1, that is, toward the second circumferential direction side D2b as it goes toward the first width direction side D1a, and the second inclined groove 5 As it goes to the outside of the tire width direction D1, that is, to the second width direction side D1b, it extends toward the second circumferential direction side D2b.

As a result, the side D4 where the first inclined groove 4 is inclined with respect to the tire width direction D1 is opposite to the side D3 where the second inclined groove 5 is inclined with respect to the tire width direction D1. Specifically, the inclined side D4 of the first inclined groove 4 is the second inclined side D4, and the inclined side D3 of the second inclined groove 5 is the first inclined side D3. The first inclined groove 4 and the second inclined groove 5 are alternately arranged in the tire circumferential direction D2.

Although not particularly limited, the center main groove 3 and the inclined grooves 4 and 5 have, for example, a groove width of 3% or more of the distance between the ground contact ends 2b and 2b (dimension in the tire width direction D1). It may be configured as. Further, although not particularly limited, the center main groove 3 and the inclined grooves 4 and 5 may have a groove width of, for example, 5 mm or more.

Further, the tread portion 2 includes a plurality of land portions 6 partitioned by a center main groove 3 and a plurality of inclined grooves 4, 4 (5, 5). The plurality of land portions 6 are a pair of first land portions 6 partitioned by a pair of first inclined grooves 4 and 4 adjacent in the tire circumferential direction D2 and a center main groove 3 and a pair adjacent to each other in the tire circumferential direction D2. Includes a second land portion 6 partitioned by the second inclined grooves 5 and 5 and the center main groove 3 of the above.

The land portion 6 includes a land groove 7 that connects the inclined grooves 4, 4 (5, 5) to each other, and a plurality of blocks 8, 9, 10 that are partitioned by the land groove 7 and arranged in the tire width direction D1. .. In the present embodiment, each land portion 6 is provided with two land grooves 7, and three blocks 8, 9, and 10.

The plurality of blocks 8, 9 and 10 are referred to as a center block 8, a quarter block 9 and a shoulder block 10 from the inside in the tire width direction D1. That is, the plurality of blocks 8, 9 and 10 include a center block 8 arranged most inside the tire width direction D1, a shoulder block 10 arranged most outside the tire width direction D1, and a center block 8 and a shoulder block. It includes a quarter block 9 arranged between the 10 and the 10th.

Although not particularly limited, in the present embodiment, on the side D3 (D4) where the land groove 7 of the land portion 6 is inclined with respect to the tire width direction D1, the inclined groove 4 (5) is with respect to the tire width direction D1. It is the opposite of the side D4 (D3) that tilts. Specifically, the inclined side of the first inclined groove 4 is the second inclined side D4, whereas the inclined side of the land groove 7 of the first land portion 6 is the first inclined side D3, while the first. 2 The inclined side of the inclined groove 5 is the first inclined side D3, whereas the inclined side of the land groove 7 of the second land portion 6 is the second inclined side D4.

Then, in the present embodiment, the angle at which the inclined grooves 4 and 5 incline with respect to the tire width direction D1 becomes smaller toward the outside of the tire width direction D1. The configurations of the inclined grooves 4 and 5 are not limited to such a configuration.

As shown in FIG. 4, the shoulder block 10 is divided into end regions 10a and 10a and a central region 10b in the tire circumferential direction D2. Specifically, the end region 10a and the central region 10b are located between the end points 10c and 10c in the circumferential direction D2 with respect to the ground contact region of the shoulder block 10 (the region inside the tire width direction D1 from the ground contact end 2b). It is divided into three equal parts. In FIG. 4, the boundary between the regions 10a and 10b is indicated by a broken line.

The shoulder block 10 includes a plurality of sipes 11 and 12. The sipes 11 and 12 are recesses having a width of 2.0 mm or less, and the land groove 7 is a recess having a width exceeding 2.0 mm. The number of sipes 11 and 12 is not particularly limited, but in the present embodiment, the number is three, so that the shoulder block 10 includes four block pieces 10d divided by the sipes 11 and 12. There is.

The plurality of sipes 11 and 12 are connected to the land ditch 7. As a result, when the ground is touched, the ends of the sipes 11 and 12 connected to the land groove 7 are easily opened, so that the sipes 11 and 12 can be prevented from closing. As a result, the edge effects of the sipes 11 and 12 can be fully exerted.

The plurality of sipes 11 and 12 include a plurality of first sipes (also referred to as "standard sipes") 11 having a first width and a second sipes ("wide sipes") having a second width larger than the first width. ”) 12 and is included. Although not particularly limited, for example, the second width may be 1.5 to 3.0 times the first width. Further, although not particularly limited, for example, the first width may be 0.5 mm to 0.8 mm, and for example, the second width may be 0.8 mm to 2.0 mm, or 0. It may be 0.8 mm to 1.2 mm.

Further, although not particularly limited, the width of the sipes 11 and 12 may be constant (not only the same but also substantially the same including a manufacturing error) over the entire length of the sipes 11 and 12. Further, the widths (first widths) of the plurality of first sipes 11 and 11 may be, for example, the same, or may be different, for example. Although not particularly limited, in the present embodiment, the widest sipe 12 among the sipe 11 and 12 of the shoulder block 10 is the second sipe 12.

The second sipe 12 is arranged so as to be sandwiched between the plurality of first sipe 11 and 11 in the tire circumferential direction D2. Moreover, the second sipe 12 extends to the grounding end 2b. Specifically, the second sipe 12 extends beyond the ground contact end 2b to the outside of the tire width direction D1. As a result, the shoulder block 10 is divided by the second sipe 12. Therefore, the followability of the shoulder block 10 to the road surface can be effectively improved.

As a result, in order to improve the followability of the shoulder block 10 to the road surface, it is not necessary to provide a large number of sipes 11 and 12 on the shoulder block 10, so that it is possible to suppress a decrease in the rigidity of the shoulder block 10. Therefore, for example, it is possible to improve the snow road surface performance, and for example, it is possible to suppress the deterioration of the dry road surface performance.

Although not particularly limited, it is preferable that at least a part of the second sipe 12 is arranged in the central region 10b of the shoulder block 10. In the present embodiment, all of the second sipes 12 are arranged in the central region 10b of the shoulder block 10. As a result, the shoulder block 10 is divided by the second sipe 12 in the central region 10b in the tire circumferential direction D2. Therefore, the followability of the shoulder block 10 to the road surface can be effectively improved.

Further, the plurality of sipes 11 and 12 include a straight sipe extending linearly and a bent sipe having a bend. The bending sipe has straight portions at both ends, and has a plurality of curved bending portions between the straight portions. The bent sipe may be provided with a plurality of bent portions over the entire length, and the bent portions may be formed by bending a straight line, that is, by refracting.

Although not particularly limited, in the present embodiment, all the first sipes 11 are bent sipes. Further, although not particularly limited, in the present embodiment, the second sipe 12 is a straight sipe. According to such a configuration, since the width of the second sipe 12 (second width) is large, the sipe length is linearly shortened, so that it is possible to suppress a decrease in the rigidity of the shoulder block 10. it can.

Further, the second sipe 12 intersects the first straight line portion 12a connected to the land groove 7 with the second straight line portion 12b inclined and intersects with the first straight line portion 12a, and the second straight line portion 12b inclined with respect to the second straight line portion 12b. It is provided with a third straight line portion 12c. The second sipe 12 includes a groove connecting portion 12d connected to the land groove 7 and a grounding end portion 12e located at the grounding end 2b.

The groove connecting portion 12d is arranged at the end portion of the first straight line portion 12a, and the ground contact end portion 12e is arranged at the middle portion of the second straight line portion 12b. As a result, the first angle θ1 (≦ 90 °) at which the groove connecting portion 12d (that is, the first straight portion 12a) intersects the tire width direction D1 is the ground contact end portion 12e (that is, the second straight portion 12b). Is different from the second angle θ2 (≦ 90 °) that intersects the tire width direction D1.

As a result, the force in the direction in which the first straight line portion 12a is easy to close is different from the force in the direction in which the second straight line portion 12b is easy to close. Therefore, when a force in a predetermined direction acts on the second sipe 12, even if one straight portion 12a (12b) of the second sipe 12 closes, the other straight portion 12b (12a) does not close. It is possible to prevent the entire second sipe 12 from closing. As a result, for example, the edge effect of at least a part of the second sipe 12 can always be exerted.

Although not particularly limited, the difference between the first angle θ1 and the second angle θ2 can be 3 ° to 30 °. Further, although not particularly limited, the first angle θ1 and the second angle θ2 can be set to 0 ° to 30 °, respectively. Further, although not particularly limited, in the present embodiment, the first angle θ1 is larger than the second angle θ2.

Further, the shoulder block 10 includes first width edge portions 10e and 10e and second width edge portions 10f facing the land groove 7 and intersecting and connecting with each other. Although not particularly limited, in the present embodiment, the first width edge portions 10e and 10e are provided in pairs, and the second width edge portions 10f are sandwiched between the pair of first width edge portions 10e and 10e. , Have been placed.

The first width edge portions 10e and 10e and the second width edge portion 10f are connected to the sipes 11 and 12, respectively. Although not particularly limited, in the present embodiment, the first width edge portion 10e is connected to the first sipe 11, and the second width edge portion 10f is connected to the second sipe 12. As described above, since the direction in which the first width edge portion 10e extends is different from the direction in which the second width edge portion 10f extends, the direction in which the end portion of the first sipe 11 is easily opened is the direction in which the second sipe 12 is easily opened. It is different from the direction of the force that the end of the is easy to open.

Moreover, the side D4 where the first width edge portion 10e is inclined with respect to the tire width direction D1 is opposite to the side D3 where the second width edge portion 10f is inclined with respect to the tire width direction D1. Specifically, the inclined side of the first width edge portion 10e is the second inclined side D4, and the inclined side of the second width edge portion 10f is the first inclined side D3.

As a result, the direction of the force that makes it easy to open the end of the first sipe 11 is the direction of the second inclined side D4, and the direction of the force that makes it easy to open the end of the second sipe 12 is the direction of the first inclined side D3. Is. Therefore, since the ends of the sipes 11 and 12 are opened against forces in various directions, the edge effect of the sipes 11 and 12 can be effectively exerted against forces in various directions.

Further, the quarter block 9 includes a width edge portion 9a facing the land groove 7 arranged between the quarter block 9 and the shoulder block 10. The shoulder block 10 includes a plurality of straight width edge portions 10e and 10f, whereas the quarter block 9 includes one straight width edge portion 9a.

As a result, the land groove 7 between the quarter block 9 and the shoulder block 10 becomes wider toward the second circumferential direction side D2b side. That is, in the present embodiment, the land groove 7 is widened from the stepping side to the kicking side. Thereby, the drainage performance of the land ditch 7 can be improved.

Further, the quarter block 9 includes a first peripheral edge portion 9b arranged on the first circumferential direction side D2a and a second peripheral edge portion 9c arranged on the second circumferential direction side D2b, and the shoulder block 10 includes a shoulder block 10. It includes a first peripheral edge portion 10g arranged on the first circumferential direction side D2a and a second peripheral edge portion 10h arranged on the second circumferential direction side D2b. The shoulder block 10 is provided with a protruding portion 10i that projects toward the second peripheral direction side D2b with respect to the extension line L2 of the second peripheral edge portion 9c of the quarter block 9.

As a result, for example, traction (force to be caught without slipping) is generated on the snow road surface by the edge of the protruding portion 10i facing the tire width direction D1. As a result, for example, it is possible to improve the turning performance on the snow road surface and the skid suppression performance when traveling straight on the snow road surface.

From the above, the pneumatic tire 1 according to the present embodiment includes a plurality of inclined grooves 4 and 5 extending from the tire equator L1 toward the outside of the tire width direction D1 and inclining with respect to the tire width direction D1. A plurality of land portions 6 partitioned by inclined grooves 4, 4 (5, 5) are provided, and the land portion 6 includes land portions 7 connecting the inclined grooves 4, 4 (5, 5) to each other. A plurality of blocks 8, 9, 10 which are partitioned by the land groove 7 and arranged in the tire width direction D1 are provided, and the plurality of blocks 8, 9, 10 are arranged most outside the tire width direction D1. The shoulder block 10 includes a shoulder block 10, which comprises a plurality of first sipes 11 having a first width and a second sipe 12 having a second width larger than the first width. The second sipe 12 is arranged so as to be connected to the land groove 7 and sandwiched between the plurality of first sipe 11 and 11 in the tire circumferential direction D2.

According to such a configuration, since the second sipe 12 is connected to the land groove 7, the end portion of the second sipe 12 is likely to open when the ground is touched, so that the second sipe 12 is prevented from closing. be able to. As a result, the edge effect of the second sipe 12 can be fully exerted.

The wide second sipe 12 is arranged so as to be sandwiched between the first sipe 11 and 11 in the tire circumferential direction D2. As a result, the shoulder block 10 is divided in the tire circumferential direction D2 by the second sipe 12, so that the followability of the shoulder block 10 to the road surface can be improved.

Further, in the pneumatic tire 1 according to the present embodiment, the second sipe 12 extends from the land groove 7 to at least the ground contact end 2b.

According to such a configuration, the ground contact area of the shoulder block 10 is divided by the second sipe 12 over the entire length in the tire width direction D1. Thereby, the followability of the shoulder block 10 to the road surface can be effectively improved.

Further, in the pneumatic tire 1 according to the present embodiment, the shoulder block 10 includes first and second width edge portions 10e and 10f facing the land groove 7 and intersecting and connecting with each other. The first and second width edge portions 10e and 10f are connected to the sipes 11 and 12, respectively.

According to such a configuration, since the first and second width edge portions 10e and 10f intersect and are connected to each other, the direction in which the first width edge portion 10e extends is the direction in which the second width edge portion 10f extends. It's different. As a result, the direction of the force at which the end of the sipe 11 connected to the first width edge 10e is easy to open is different from the direction of the force at which the end of the sipe 12 connected to the second width edge 10f is easy to open. ing.

Further, in the pneumatic tire 1 according to the present embodiment, the side D4 in which the first width edge portion 10e is inclined with respect to the tire width direction D1 has the second width edge portion 10f in the tire width direction D1. The configuration is opposite to that of the inclined side D3.

According to such a configuration, the inclined side D4 in the direction in which the first width edge portion 10e extends is opposite to the inclined side D3 in the direction in which the second width edge portion 10f extends. As a result, the direction of the force at which the end of the sipe 11 connected to the first width edge 10e is easy to open is larger than the direction of the force at which the end of the sipe 12 connected to the second width edge 10f is easy to open. It's different.

Further, in the pneumatic tire 1 according to the present embodiment, at least one of the plurality of sipes 11 and 12 12 includes a first straight line portion 12a connected to the land groove 7 and a second ground contact end 2b. A configuration in which a straight line portion 12b is provided, and the angle θ1 at which the first straight line portion 12a intersects the tire width direction D1 is different from the angle θ2 at which the second straight line portion 12b intersects the tire width direction D1. Is.

According to such a configuration, the angle θ1 at which the first straight line portion 12a intersects the tire width direction D1 is different from the angle θ2 at which the second straight line portion 12b intersects the tire width direction D1. The force in the direction in which the second straight line portion 12b is easy to close is different from the force in the direction in which the second straight line portion 12b is easy to close. As a result, a force acts on the sipe 12 in a predetermined direction, and even if one straight portion 12a (12b) is closed, the other straight portion 12b (12a) is not closed, so that the entire sipe 12 is closed. It is possible to prevent it from being stored.

The pneumatic tire 1 is not limited to the configuration of the above-described embodiment, and is not limited to the above-mentioned action and effect. Further, it goes without saying that the pneumatic tire 1 can be modified in various ways without departing from the gist of the present invention. For example, it goes without saying that one or a plurality of configurations and methods according to the following various modification examples may be arbitrarily selected and adopted for the configurations and methods according to the above-described embodiment.

(1) In the pneumatic tire 1, the depth of the second sipe 12 may be the same as, for example, the depth of the first sipe 11, and may be deeper than, for example, the depth of the first sipe 11. May be good. Further, in order to suppress the decrease in the rigidity of the shoulder block 10, the depth of the second sipe 12 may be shallower than the depth of the first sipe 11, for example.

(2) Further, in the pneumatic tire 1 according to the above embodiment, the first sipe 11 is connected to the land groove 7 and extends to the ground contact end 2b. However, the pneumatic tire 1 is not limited to such a configuration. For example, the first sipe 11 may be configured to be separated from the land ditch 7. Further, for example, the first sipe 11 may be configured to be separated from the grounding end 2b.

(3) Further, in the pneumatic tire 1 according to the above embodiment, the land portion 6 is provided with two land grooves 7, 7 for connecting the inclined grooves 4, 4 (5, 5) to each other. Is. However, the pneumatic tire 1 is not limited to such a configuration. For example, the land portion 6 may be configured to include one or three or more land grooves 7, 7 connecting the inclined grooves 4, 4 (5, 5) to each other, whereby the blocks 8, 9, It may be configured to have two or four or more of 10.

(4) Further, in the pneumatic tire 1 according to the above embodiment, one first sipe 11 is arranged on the first circumferential direction side D2a and one on the second circumferential direction side D2b with respect to the second sipe 12. It is a composition that is done. However, the pneumatic tire 1 is not limited to such a configuration. For example, a plurality of first sipes 11 may be arranged on the first circumferential direction side D2a with respect to the second sipes 12. Further, for example, a plurality of first sipes 11 may be arranged on the second circumferential direction side D2b with respect to the second sipes 12.

(5) Further, in the pneumatic tire 1 according to the above embodiment, the second sipe 12 extends from the land groove 7 to the outside of the ground contact end 2b in the tire width direction D1. However, the pneumatic tire 1 is not limited to such a configuration. For example, the second sipe 12 may not extend to the grounding end 2b, that is, may be separated from the grounding end 2b.

(6) Further, in the pneumatic tire 1 according to the above embodiment, the shoulder block 10 is configured to include a plurality of straight width edge portions 10e and 10f facing the land groove 7. However, the pneumatic tire 1 is not limited to such a configuration. For example, the shoulder block 10 may be configured to include one straight width edge portion 10e (10f) facing the land groove 7.

(7) Further, in the pneumatic tire 1 according to the above embodiment, the side D4 in which the first width edge portion 10e is inclined with respect to the tire width direction D1 has the second width edge portion 10f with respect to the tire width direction D1. It is the opposite of the side D3 that tilts. However, the pneumatic tire 1 is not limited to such a configuration. For example, the inclined side D4 (D3) of the first width edge portion 10e may be the same as the inclined side D4 (D3) of the second width edge portion 10f.

(8) Further, in the pneumatic tire 1 according to the above embodiment, the first angle θ1 in which the first straight line portion 12a connected to the land groove 7 intersects the tire width direction D1 is the second including the ground contact end 2b. The structure is such that the straight line portion 12b is different from the second angle θ2 that intersects the tire width direction D1. However, the pneumatic tire 1 is not limited to such a configuration. For example, the first angle θ1 may be the same as the second angle θ2. Moreover, for example, the first straight line portion 12a and the second straight line portion 12b may be connected so as to form a straight line.

(9) Further, in the pneumatic tire 1 according to the above embodiment, the first straight line portion 12a connected to the land groove 7 is connected to the second straight line portion 12b including the ground contact end 2b. Is. However, the pneumatic tire 1 is not limited to such a configuration.

For example, the first straight line portion 12a connected to the land groove 7 is connected so as to intersect another straight line portion, and the second straight line portion 12b including the ground contact end 2b intersects the other straight line portion. It may be configured to be connected. That is, at least one straight line portion or a bent portion may be provided between the first straight line portion 12a and the second straight line portion 12b.

1 ... Pneumatic tire, 2 ... Tread part, 2a ... Tread surface, 2b ... Grounding edge, 3 ... Center main groove, 4 ... 1st inclined groove, 5 ... 2nd inclined groove, 6 ... Land part, 7 ... Land groove , 8 ... Center block, 9 ... Quarter block, 9a ... Width edge, 9b ... First peripheral edge, 9c ... Second peripheral edge, 10 ... Shoulder block, 10a ... Edge area, 10b ... Central area, 10c ... End point 10d ... Block piece, 10e ... First width edge, 10f ... Second width edge, 10g ... First peripheral edge, 10h ... Second peripheral edge, 10i ... Projection, 11 ... First sipe, 12 ... First 2 sipes, 12a ... 1st straight line part, 12b ... 2nd straight line part, 12c ... 3rd straight line part, 12d ... groove connecting part, 12e ... grounding end part, D1 ... tire width direction, D1a ... 1st width direction side, D1b ... 2nd width direction side, D2 ... tire circumferential direction, D2a ... 1st peripheral direction side, D2b ... 2nd peripheral direction side, D3 ... 1st inclined side, D4 ... 2nd inclined side, L1 ... tire equatorial line

Claims (5)

A plurality of inclined grooves extending from the equator of the tire toward the outside in the tire width direction and inclined with respect to the tire width direction.
With multiple land areas, partitioned by multiple ramps,
The land portion includes a land groove connecting the inclined grooves and a plurality of blocks partitioned by the land groove and arranged in the tire width direction.
The plurality of blocks include a shoulder block arranged on the outermost side in the tire width direction.
The shoulder block comprises a plurality of first sipe having a first width and a second sipe having a second width larger than the first width.
The second sipe is a pneumatic tire that is connected to the land groove and is arranged so as to be sandwiched between the plurality of first sipe in the tire circumferential direction. The pneumatic tire according to claim 1, wherein the second sipe extends from the land groove to at least the ground contact end. The shoulder block comprises first and second width edges facing the land groove and intersecting and connecting with each other.
The pneumatic tire according to claim 1 or 2, wherein the first and second width edges are connected to the sipe, respectively. The inflated side according to claim 3, wherein the side where the first width edge portion is inclined with respect to the tire width direction is opposite to the side where the second width edge portion is inclined with respect to the tire width direction. tire. At least one of the plurality of sipes includes a first straight line portion connected to the land groove and a second straight line portion including a ground contact end.
The pneumatic tire according to any one of claims 1 to 4, wherein the angle at which the first straight line portion intersects with the tire width direction is different from the angle at which the second straight line portion intersects with the tire width direction. ..

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