Pneumatic tires

Abstract

To provide a tire that can be improved in snow-road surface performance while securing rigidity of a block.SOLUTION: In a pneumatic tire, a first shoulder block comprises at least one first shoulder circumferential groove extending in a tire circumferential direction, and the at least one first shoulder circumferential groove gets away from each of a pair of first shoulder slits, and a center block comprises at least one center circumferential groove extending in the tire circumferential direction, where the at least one center circumferential groove is linked to each of a pair of center slits.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to pneumatic tires. [Background technology]

[0002] Conventionally, for example, a pneumatic tire has a plurality of main grooves extending in the tire circumferential direction and a plurality of lands defined by the plurality of main grooves and a pair of ground contact edges (for example, Patent Document 1). The lands have a plurality of slits extending in the tire width direction and a plurality of blocks defined by the plurality of slits.

[0003] The block has multiple circumferential grooves extending in the tire circumferential direction, and all of the circumferential grooves are away from the slits. This makes it possible to suppress a decrease in rigidity at the ends of the blocks in the tire circumferential direction. However, because the length of the circumferential grooves is short, it is not possible to increase traction by the edges of the circumferential grooves. Therefore, it is not possible to sufficiently improve snow road performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-247708 A Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present disclosure is to provide a pneumatic tire that can improve performance on snowy road surfaces while ensuring the rigidity of the blocks. [Means for solving the problem]

[0006] The pneumatic tire comprises a plurality of main grooves extending in a tire circumferential direction and a plurality of lands defined by the plurality of main grooves and a pair of ground contact edges, the plurality of lands comprising first and second shoulder lands arranged on the outermost sides in a tire width direction and a center land arranged closest to the tire equatorial plane, the first shoulder land comprising a plurality of first shoulder slits extending in the tire width direction and a first shoulder block defined by a pair of first shoulder slits adjacent in the tire circumferential direction among the plurality of first shoulder slits, the first shoulder block comprising at least one first shoulder circumferential groove extending in the tire circumferential direction, the at least one first shoulder circumferential groove being spaced apart from each of the pair of first shoulder slits, the center land comprising a plurality of center slits extending in the tire width direction and a center block defined by a pair of center slits adjacent in the tire circumferential direction among the plurality of center slits, the center block comprising at least one center circumferential groove extending in the tire circumferential direction, the at least one center circumferential groove being connected to each of the pair of center slits. [Brief description of the drawings]

[0007] [Figure 1] Illustrative diagram of the first inclined side [Diagram 2] Illustrative diagram of the second inclined side [Diagram 3] FIG. 1 is a cross-sectional view of a main portion of a pneumatic tire according to an embodiment of the present invention taken along a tire meridian plane. [Figure 4] FIG. 1 is a development view of a main part of a tread surface of a pneumatic tire according to the embodiment; [Diagram 5] FIG. 3 is a development view of the main part of the first shoulder land according to the embodiment. [Figure 6] FIG. 1 is a development view of a main part of the first mediate land according to the embodiment; [Figure 7] Exploded view of the main part of the center land according to the embodiment [Figure 8] FIG. 1 is an exploded view of a main part of the second mediate land according to the embodiment; [Figure 9]An exploded view of the main part of the second shoulder land according to the embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, one embodiment of a pneumatic tire will be described with reference to Figures 1 to 9. Note that in each figure, the dimensional ratios in the drawing do not necessarily match the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily match either.

[0009] Note that the dimensional values, positional relationships, and size relationships described below were measured in a normal unloaded state with a pneumatic tire (hereinafter also simply referred to as "tire") 1 mounted on a normal rim 30 and inflated to normal internal pressure. A normal rim is a rim that is determined for each tire 1 by a standard system that includes the standard on which the tire 1 is based, and is, for example, a standard rim for JATMA and a "Measuring Rim" for TRA and ETRTO.

[0010] In addition, the normal internal pressure is the air pressure set for each tire 1 by each standard in the standard system including the standard on which tire 1 is based, and in the case of JATMA, it is the maximum air pressure, in the case of TRA, it is the maximum value listed in the table "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES", and in the case of ETRTO, it is "INFLATION PRESSURE".

[0011] In each figure, the first direction D1 is the tire width direction D1 which is parallel to the tire rotation axis which is the center of rotation of the tire 1, the second direction D2 is the tire radial direction D2 which is the diameter direction of the tire 1, and the third direction D3 is the tire circumferential direction D3 around the tire rotation axis.

[0012] In the tire width direction D1, the inner side is the side closer to the tire equatorial plane S1, and the outer side is the side farther from the tire equatorial plane S1. In addition, in the tire radial direction D2, the inner side is the side closer to the tire rotation axis, and the outer side is the side farther from the tire rotation axis.

[0013] In the tire width direction D1, the first side D11 is also referred to as the first width direction side D11, and the second side D12 is also referred to as the second width direction side D12. In the tire circumferential direction D3, the first side D31 is also referred to as the first circumferential side D31, and the second side D32 is also referred to as the second circumferential side D32.

[0014] The tire equatorial plane S1 is a plane perpendicular to the tire rotation axis and located at the center in the tire width direction D1 of the tire 1, and the tire meridian plane is a plane that includes the tire rotation axis and is perpendicular to the tire equatorial plane S1. The tire equatorial line is a line where the outer surface of the tire 1 in the tire radial direction D2 (a tread surface 2a described later) and the tire equatorial plane S1 intersect.

[0015] As shown in Fig. 1, the side D4 that approaches the first circumferential side D31 as it approaches the first widthwise side D11 (the side that approaches the second circumferential side D32 as it approaches the second widthwise side D12) is referred to as the first inclined side D4. As shown in Fig. 2, the side D5 that approaches the second circumferential side D32 as it approaches the first widthwise side D11 (the side that approaches the first circumferential side D31 as it approaches the second widthwise side D12) is referred to as the second inclined side D5.

[0016] In addition, "inclined to the same side with respect to the tire circumferential direction D3 (tire width direction D1)" refers to the same inclined side (for example, the first inclined sides D4, D4 and the second inclined sides D5, D5 and the same). In other words, even if the inclination angles with respect to the tire circumferential direction D3 (tire width direction D1) are different, as long as they are the same inclined sides D4, D4 (D5, D5), they are included in "inclined to the same side with respect to the tire circumferential direction D3 (tire width direction D1)".

[0017] Additionally, "inclined on the opposite side with respect to the tire circumferential direction D3 (tire width direction D1)" refers to opposite inclined sides (first inclined side D4 and second inclined side D5). In other words, even if the inclination angle with respect to the tire circumferential direction D3 (tire width direction D1) is the same, if the inclination sides D4 and D5 are opposite, this is included in "inclined on the opposite side with respect to the tire circumferential direction D3 (tire width direction D1)".

[0018] 3, the tire 1 according to this embodiment includes a pair of beads 1a each having a bead core, sidewalls 1b each extending outward in the tire radial direction D2 from each bead 1a, and a tread 2 connected to the outer ends of the pair of sidewalls 1b in the tire radial direction D2, the outer surface (tread surface 2a) of which in the tire radial direction D2 comes into contact with the road surface. In this embodiment, the tire 1 is a pneumatic tire 1 in which air is put, and is mounted on a rim 30.

[0019] The tire 1 also includes a carcass 1c that is bridged between a pair of bead cores, and an inner liner 1d that is disposed inside the carcass 1c and has an excellent function of preventing gas permeation in order to maintain air pressure. The carcass 1c and the inner liner 1d are disposed along the inner circumference of the tire, spanning the beads 1a, the sidewalls 1b, and the tread 2.

[0020] The tire 1 has a structure that is asymmetric with respect to the tire equatorial plane S1. In this embodiment, the tire 1 is a tire for which the mounting direction on a vehicle is specified, and which side of the tire 1 faces the vehicle when mounted on the rim 30 is specified. The tread pattern formed on the tread surface 2a of the tread 2 has a shape that is asymmetric with respect to the tire equatorial plane S1.

[0021] The mounting orientation on the vehicle may be indicated, for example, on the sidewall 1b. Specifically, the sidewall 1b may include a sidewall rubber 1e arranged on the outer side of the carcass 1c in the tire width direction D1 to form the tire outer surface, and the sidewall rubber 1e may have an indication portion (not shown) on the surface thereof that indicates the mounting orientation on the vehicle.

[0022] For example, one sidewall 1b that is disposed on the inside (hereinafter also referred to as the "vehicle inner side") when mounted on a vehicle is marked with a label indicating that it is the vehicle inner side (for example, "INSIDE" or the like). Also, for example, the other sidewall 1b that is disposed on the outside (hereinafter also referred to as the "vehicle outer side") when mounted on a vehicle is marked with a label indicating that it is the vehicle outer side (for example, "OUTSIDE" or the like). Although not particularly limited, for example, as in this embodiment, the first width direction side D11 may be the vehicle outer side D11 and the second width direction side D12 may be the vehicle inner side D12.

[0023] The tread 2 includes a tread rubber 2b having a tread surface 2a that comes into contact with the road surface, and a belt 2c disposed between the tread rubber 2b and the carcass 1c. The tread surface 2a has a contact surface that actually comes into contact with the road surface, and the outer ends of the contact surface in the tire width direction D1 are called contact ends 2d, 2e. The contact surface refers to the tread surface 2a that comes into contact with the road surface when the tire 1 is mounted on a standard rim 30, inflated to a standard internal pressure, placed vertically on a flat road surface, and a standard load is applied.

[0024] The normal load is the load determined for each tire 1 by each standard in the standard system including the standard on which tire 1 is based. For JATMA, it is the maximum load capacity, for TRA, it is the maximum value shown in the table above, and for ETRTO, it is the "LOAD CAPACITY." However, if tire 1 is for passenger cars, it is 85% of the corresponding load at an internal pressure of 180 kPa.

[0025] 3 and 4, the tread rubber 2b includes a plurality of main grooves 3, 4, 5, 6 extending in the tire circumferential direction D3, and a plurality of lands 7, 8, 9, 10, 11 defined by the plurality of main grooves 3, 4, 5, 6 and a pair of ground contact edges 2d, 2e. Although not particularly limited, for example, as in this embodiment, the number of the main grooves 3, 4, 5, 6 may be four, and the number of the lands 7, 8, 9, 10, 11 may be five.

[0026] The main grooves 3, 4, 5, 6 extend continuously in the tire circumferential direction D3. The main grooves 3, 4, 5, 6 may have a portion that is shallower, a so-called tread wear indicator (not shown), which becomes exposed as the grooves wear, to indicate the degree of wear. For example, the main grooves 3, 4, 5, 6 may have a groove width that is 3% or more of the distance between the ground contact ends 2d, 2e (the dimension in the tire width direction D1). For example, the main grooves 3, 4, 5, 6 may have a groove width that is 5 mm or more.

[0027] A pair of main grooves 3, 4 arranged on the outermost sides in the tire width direction D1 are referred to as shoulder main grooves 3, 4. Of the shoulder main grooves 3, 4, the main groove 3 arranged on the first width direction side (vehicle outer side) D11 is referred to as the first shoulder main groove 3, and the main groove 4 arranged on the second width direction side (vehicle inner side) D12 is referred to as the second shoulder main groove 4.

[0028] The main grooves 5, 6 disposed between the pair of shoulder main grooves 3, 4 are referred to as center main grooves 5, 6. Of the center main grooves 5, 6, the main groove 5 disposed on the first width direction side (vehicle outer side) D11 is referred to as the first center main groove 5, and the main groove 6 disposed on the second width direction side (vehicle inner side) D12 is referred to as the second center main groove 6.

[0029] The lands 7, 8 defined by the shoulder main grooves 3, 4 and the ground contact edges 2d, 2e are called shoulder lands 7, 8, and the lands 9, 10, 11 defined by a pair of adjacent main grooves 3, 4, 5, 6 are called middle lands 9, 10, 11. The middle lands 9, 10 defined by the shoulder main grooves 3, 4 and the center main grooves 5, 6 are also called mediate lands 9, 10, and the middle land 11 defined by a pair of center main grooves 5, 6 is also called center land 11.

[0030] Of the shoulder lands 7, 8, the land 7 arranged on the first width direction side (vehicle outer side) D11 is referred to as the first shoulder land 7, and the land 8 arranged on the second width direction side (vehicle inner side) D12 is referred to as the second shoulder land 8. Also, of the intermediate lands 9, 10, the land 9 arranged on the first width direction side (vehicle outer side) D11 is referred to as the first intermediate land 9, and the land 10 arranged on the second width direction side (vehicle inner side) D12 is referred to as the second intermediate land 10.

[0031] Although not particularly limited, for example, as in the present embodiment, the main grooves 3, 4, 5, 6 may include straight main grooves 3, 5 and zigzag main grooves 4, 6. The straight main grooves 3, 5 are main grooves 3, 5 whose edges on the tread surface 2a are parallel to the tire circumferential direction D3, and the zigzag main grooves 4, 6 are main grooves 4, 6 whose edges on the tread surface 2a are inclined with respect to the tire circumferential direction D3.

[0032] The lands 7, 8, 9, 10, 11 each include a plurality of sub-grooves 12, 13, ..., 25, 26. Among the sub-grooves 12, 13, ..., 25, 26, the sub-grooves 12, 13, 14, 15, 16 extending along the tire circumferential direction D3 are referred to as circumferential grooves 12, 13, 14, 15, 16, and among the sub-grooves 12, 13, ..., 25, 26, the sub-grooves 17, 18, ..., 25, 26 extending along the tire width direction D1 are referred to as width grooves 17, 18, ..., 25, 26.

[0033] Among the lateral grooves 17, 18, ..., 25, 26, the lateral grooves 17, 18, 19, 20, 21 whose groove width on the tread surface 2a is 1.6 mm or more are referred to as slits 17, 18, 19, 20, 21. Also, among the lateral grooves 17, 18, ..., 25, 26, the lateral grooves 22, 23, 24, 25, 26 whose groove width on the tread surface 2a is less than 1.6 mm are referred to as sipes 22, 23, 24, 25, 26.

[0034] The inclination angle of the circumferential grooves 12, 13, 14, 15, 16 with respect to the tire circumferential direction D3 is preferably less than 45°, for example, 30° or less. The inclination angle of the width grooves 17, 18, ..., 25, 26 with respect to the tire width direction D1 is preferably 45° or less, for example, 30° or less.

[0035] Although not particularly limited, for example, as in the present embodiment, all the slits 17, 18, 19, 20, 21 may extend over the entire length of the lands 7, 8, 9, 10, 11 in the tire width direction D1. That is, both ends of all the slits 17, 18, 19, 20, 21 may be connected to the main grooves 3, 4, 5, 6 or the ground contact edges 2d, 2e, respectively. As a result, the lands 7, 8, 9, 10, 11 have a plurality of blocks 7a, 8a, 9a, 10a, 11a partitioned by the slits 17, 18, 19, 20, 21 aligned in the tire circumferential direction D3.

[0036] Although not particularly limited, for example, as in this embodiment, the numbers of blocks 7a, 8a, 9a, 10a, 11a of each land 7, 8, 9, 10, 11 may be the same, and the numbers of slits 17, 18, 19, 20, 21 of each land 7, 8, 9, 10, 11 may be the same. Furthermore, although not particularly limited, for example, as in this embodiment, the groove widths of the slits 17, 18, 19, 20, 21 may be constant (including not only the same but also approximately the same with a difference of ±5%) over the entire length.

[0037] In addition, although not particularly limited, for example, as in this embodiment, each of the blocks 7a, 8a, 9a, 10a, and 11a may be provided with one circumferential groove 12, 13, 14, 15, and 16. In addition, although not particularly limited, the groove width of the circumferential grooves 12, 13, 14, 15, and 16 may be, for example, 0.5 mm to 3.0 mm, and is preferably, for example, 1.0 mm to 2.0 mm.

[0038] Although not particularly limited, the length of the circumferential grooves 12, 13, 14, 15, 16 in the tire circumferential direction D3 is preferably, for example, 67% (= 2 / 3) or more, and more preferably 75% (= 3 / 4) or more, of the length of the blocks 7a, 8a, 9a, 10a, 11a in the tire circumferential direction D3. For example, the circumferential grooves 12, 13, 14, 15, 16 may extend in the tire circumferential direction D3 so as to intersect with all of the sipes 22, 23, 24, 25, 26 of the blocks 7a, 8a, 9a, 10a, 11a.

[0039] Here, the configuration of the sipes 22, 24 of the lands 7, 9, which are entirely positioned on the vehicle outer side (first width direction side) D11 of the tire equatorial plane S1, and the sipes 23, 25 of the lands 8, 10, which are entirely positioned on the vehicle inner side (second width direction side) D12 of the tire equatorial plane S1, will be described with reference to Figure 4.

[0040] 4, for example, the number of sipes 23 on the second shoulder land 8 may be greater than the number of sipes 22 on the first shoulder land 7. And, for example, the total length of the sipes 23 on the second shoulder land 8 may be greater than the total length of the sipes 22 on the first shoulder land 7.

[0041] Also, for example, as in the present embodiment, the number of sipes 25 of the second intermediate land 10 may be greater than the number of sipes 24 of the first intermediate land 9. And, for example, the total length of the sipes 25 of the second intermediate land 10 may be greater than the total length of the sipes 24 of the first intermediate land 9.

[0042] In this way, in the land 8, 10 that is entirely disposed on the second width direction side (vehicle inner side) D12 from the tire equatorial plane S1, the length of the sipes 23, 25 is increased, so that the traction by the edges of the sipes 23, 25 of the land 8, 10 on the second width direction side (vehicle inner side) D12 can be increased. This can improve the snowy road surface performance.

[0043] Moreover, by preventing the length of the sipes 22, 24 from becoming too long in the lands 7, 9 that are entirely disposed on the first width direction side (vehicle outer side) D11 of the tire equatorial plane S1, it is possible to prevent the rigidity of the lands 7, 9 on the first width direction side (vehicle outer side) D11 from decreasing, thereby improving the dry road performance (especially the steering stability during cornering).

[0044] Therefore, it is possible to achieve both snowy road performance by exerting traction and dry road performance by ensuring rigidity. As a result, although not limited thereto, the tire 1 according to the present embodiment can be used as an all-season tire (a tire suitable for dry roads and snowy roads). Note that the length of the sipes 22, 23, 24, 25, 26 (the same applies to the lengths of the respective parts 22c, 22d, 23c, 23d, ..., 25c, 25d, 26c, 26d described later) refers to the length of the groove width center of the sipes 22, 23, 24, 25, 26.

[0045] Next, the configuration of each of the lands 7, 8, 9, 10, and 11 will be described with reference to FIGS.

[0046] First, the configuration of the first shoulder land 7 will be described with reference to FIG.

[0047] For example, when the vehicle brakes or turns with the tire 1 as the outer wheel, a large force is likely to act on the first shoulder land 7. In contrast, as shown in Fig. 5, the circumferential groove (also called "first shoulder circumferential groove") 12 of the first shoulder land 7 is separated from each of a pair of slits (also called "first shoulder slits") 17, 17 that divide the block (also called "first shoulder block") 7a.

[0048] This makes it possible to suppress a decrease in the rigidity of the end portions of the blocks 7a in the tire circumferential direction D3, thereby suppressing a decrease in the rigidity of the blocks 7a, thereby improving, for example, the dry road performance (particularly, the braking performance and the steering stability during cornering).

[0049] Although not particularly limited, for example, as in this embodiment, the groove width of the circumferential groove 12 may be larger than the groove width of the sipes 22 and smaller than the groove width of the slits 17. Furthermore, although not particularly limited, for example, as in this embodiment, the circumferential groove 12 (specifically, the groove width center) may extend parallel to the tire circumferential direction D3 (including not only completely parallel, but also approximately parallel with an inclination of less than ±1°).

[0050] Also, for example, a first end 22a (outer end in the tire width direction D1) of the sipe 22 may be connected to an outer end 7b of the first shoulder land 7 in the tire width direction D1, and a second end 22b (inner end in the tire width direction D1) of the sipe 22 may be connected to an inner end 7c of the first shoulder land 7 in the tire width direction D1. That is, a first end 22a of the sipe 22 may be connected to the first ground-contact edge 2d, and a second end 22b of the sipe 22 may be connected to the first shoulder main groove 3.

[0051] Also, the sipe 22 may have, for example, a straight portion 22c extending straight and a zigzag portion 22d extending zigzag. And, for example, as in this embodiment, the circumferential groove 12 may intersect with the straight portion 22c of the sipe 22. For example, as in this embodiment, in the sipe 22 of the first shoulder land 7, the length of the straight portion 22c may be longer than the length of the zigzag portion 22d.

[0052] Also, for example, as in this embodiment, the straight portion 22c may be arranged in pairs on both sides of the sipe 22 in the tire width direction D1, and the zigzag portion 22d may be arranged between the pair of straight portions 22c, 22c. Also, for example, as in this embodiment, the slit 17 of the first shoulder land 7 and the sipe 22 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1.

[0053] Next, the configuration of the first mediate land 9 will be described with reference to FIG.

[0054] For example, when the vehicle turns with the tire 1 as the outer wheel, a relatively large force is likely to act on the first intermediate land 9. In contrast, as shown in Fig. 6, the circumferential groove (also called "first intermediate circumferential groove") 14 of the first intermediate land 9 is spaced apart from each of a pair of slits (also called "first intermediate slits") 19, 19 that divide the block (also called "first intermediate block") 9a.

[0055] This makes it possible to suppress a decrease in the rigidity of the end portions of the blocks 9a in the tire circumferential direction D3, thereby suppressing a decrease in the rigidity of the blocks 9a, thereby improving, for example, the dry road performance (especially the steering stability during cornering).

[0056] When the vehicle turns with the tire 1 as the outer wheel, the ground contact pressure of the inner region in the tire width direction D1 of the block 9a of the first intermediate land 9 is low, so that the traction by the edge of the inner region is likely to be small. On the other hand, the circumferential groove 14 is disposed on the inner side in the tire width direction D1 of the center L1 of the block 9a in the tire width direction D1.

[0057] This allows the edge length of the inner region of the block 9a to be longer, which prevents the traction of the inner region of the block 9a, where the ground pressure is low, from decreasing when turning on a snowy road surface. This prevents the snowy road performance (especially the steering stability when turning) from decreasing. The center L1 (the same applies to the center L2 described later) of the block 9a in the tire width direction D1 is a line parallel to the tire circumferential direction D3 that passes through the center position between the outermost end and the innermost end of the block 9a in the tire width direction D1.

[0058] Also, although not particularly limited, for example, as in this embodiment, the groove width of the circumferential groove 14 may be larger than the groove width of the sipes 24 and smaller than the groove width of the slits 19. Also, although not particularly limited, for example, as in this embodiment, the circumferential groove 14 (specifically, the groove width center) may extend parallel to the tire circumferential direction D3 (including not only completely parallel but also approximately parallel with an inclination of less than ±1°).

[0059] Also, for example, a first end 24a (outer end in the tire width direction D1) of the sipe 24 may be connected to an outer end 9b of the first intermediate land 9 in the tire width direction D1, and a second end 24b (inner end in the tire width direction D1) of the sipe 24 may be connected to an inner end 9c of the first intermediate land 9 in the tire width direction D1. That is, the first end 24a of the sipe 24 may be connected to the first shoulder main groove 3, and the second end 24b of the sipe 24 may be connected to the first center main groove 5.

[0060] Also, the sipe 24 may have, for example, a straight portion 24c extending straight and a zigzag portion 24d extending zigzag. And, for example, as in this embodiment, the circumferential groove 14 may intersect with the straight portion 24c of the sipe 24. Note that, for example, as in this embodiment, in the sipe 24 of the first intermediate land 9, the length of the straight portion 24c may be longer than the length of the zigzag portion 24d.

[0061] Also, for example, as in this embodiment, the straight portion 24c may be arranged in pairs on both sides of the sipe 24 in the tire width direction D1, and the zigzag portion 24d may be arranged between the pair of straight portions 24c, 24c. Also, for example, as in this embodiment, the slit 19 of the first intermediate land 9 and the sipe 24 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1.

[0062] Next, the configuration of the center land 11 will be described with reference to FIG.

[0063] For example, when a vehicle travels straight, the contact length (length in the tire circumferential direction D3) of the inner region in the tire width direction D1, particularly the center land 11, becomes longer. As a result, the circumferential groove (also called the "center circumferential groove") 16 of the center land 11 comes into contact with the ground many times.

[0064] On the other hand, the circumferential groove 16 of the center land 11 is connected to each of a pair of slits (also called "center slits") 21, 21 that divide the block (also called "center block") 11a. This allows the length of the circumferential groove 16 of the center land 11, which comes into contact with the ground many times, to be longer, so that the traction by the edge of the circumferential groove 16 on snowy roads can be increased. This allows the snowy road performance (especially the steering stability by preventing skidding) to be improved.

[0065] Although not particularly limited, for example, as in this embodiment, the groove width of the circumferential groove 16 may be larger than the groove width of the sipes 26 and smaller than the groove width of the slits 21. Furthermore, although not particularly limited, for example, as in this embodiment, the circumferential groove 16 (specifically, the groove width center) may extend parallel to the tire circumferential direction D3 (including not only completely parallel but also approximately parallel with an inclination of less than ±1°).

[0066] Also, for example, the first end 26a of the sipe 26 is connected to the first end 11b of the center land 11 in the tire width direction D1, and the second end 26b of the sipe 26 is connected to the second end 11c of the center land 11 in the tire width direction D1. That is, the first end 26a of the sipe 26 is connected to the first center main groove 5, and the second end 26b of the sipe 26 is connected to the second center main groove 6.

[0067] Also, the sipe 26 may have, for example, a straight portion 26c extending straight and a zigzag portion 26d extending zigzag. And, for example, as in this embodiment, the circumferential groove 16 may intersect with the zigzag portion 26d of the sipe 26. For example, as in this embodiment, in the sipe 26 of the center land 11, the length of the zigzag portion 26d may be longer than the length of the straight portion 26c.

[0068] Also, for example, as in this embodiment, the straight portion 26c may be arranged in pairs on both sides of the sipe 26 in the tire width direction D1, and the zigzag portion 26d may be arranged between the pair of straight portions 26c, 26c. Also, for example, as in this embodiment, the slit 21 of the center land 11 and the sipe 26 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1.

[0069] Next, the configuration of the second mediate land 10 will be described with reference to FIG.

[0070] As shown in Fig. 8, the circumferential groove (also called "second mediate circumferential groove") 15 of the second mediate land 10 is connected to one 20a of a pair of slits (also called "second mediate slits") 20a, 20b that divide the block (also called "second mediate block") 10a. This allows the length of the circumferential groove 15 to be secured.

[0071] In addition, the circumferential groove 15 of the second intermediate land 10 is spaced apart from the other 20b of the pair of slits 20a, 20b, which makes it possible to suppress a decrease in rigidity of one end of the block 10a in the tire circumferential direction D3.

[0072] Therefore, the traction by the edge of the circumferential groove 15 can be secured on the snowy road surface, so that the snowy road performance (especially the steering stability by preventing skidding) can be secured, and the rigidity of the block 10a can be prevented from decreasing. In this way, in the second intermediate land 10, for example, it is possible to achieve both the snowy road performance by exerting the traction and the dry road performance by securing the rigidity.

[0073] Although not particularly limited, for example, the groove depth (e.g., average groove depth) of one slit 20a may be shallower than the groove depth (e.g., average groove depth) of the other slit 20b. That is, the pair of slits 20a, 20b may include a shallow groove slit 20a connected to the circumferential groove 15 and a deep groove slit 20b separated from the circumferential groove 15 and having a deeper groove depth than the shallow groove slit 20a.

[0074] For example, as in this embodiment, the slits 20 arranged in the tire circumferential direction D3 may be shallow groove slits 20a and deep groove slits 20b arranged alternately in the tire circumferential direction D3. Also, for example, as in this embodiment, the slits 20a and 20b may have a protrusion 20c protruding from the groove bottom to the outside in the tire radial direction D2, thereby making the groove depth shallow.

[0075] Also, although not particularly limited, for example, as in this embodiment, the groove width of the circumferential groove 15 may be larger than the groove width of the sipe 25 and smaller than the groove width of the slit 20. Also, for example, as in this embodiment, among the multiple circumferential grooves 15a, 15b of the second intermediate land 10, some of the circumferential grooves 15a may be disposed inward in the tire width direction D1 from the center L2 of the block 9a in the tire width direction D1.

[0076] That is, the circumferential groove 15 of the second intermediate land 10 may be configured to include an inner circumferential groove 15a disposed on the inner side in the tire width direction D1 of the center L2 of the block 9a in the tire width direction D1, and a central circumferential groove 15b intersecting the center L2 of the block 9a in the tire width direction D1. Note that, for example, as in this embodiment, the circumferential grooves 15 aligned in the tire circumferential direction D3 may be arranged such that the inner circumferential grooves 15a and the central circumferential grooves 15b are alternately arranged in the tire circumferential direction D3.

[0077] In addition, the circumferential groove 15 (specifically, the groove width center) extends at an angle to the tire circumferential direction D3. This allows the length of the circumferential groove 15 of the second intermediate land 10 to be increased, so that the traction by the edge of the circumferential groove 15 on a snowy road surface can be increased. This improves the snowy road performance (especially the steering stability by preventing skidding).

[0078] Although not particularly limited, the angle at which the circumferential groove 15 is inclined with respect to the tire circumferential direction D3 is preferably, for example, 1° or more, and, for example, 10° or less. Also, for example, as in this embodiment, the circumferential groove 15 and the slits 20 may be inclined toward opposite sides D5, D4 with respect to the tire circumferential direction D3. Specifically, in this embodiment, the circumferential groove 15 extends with an inclination toward the second inclined side D5, and the slits 20 extend with an inclination toward the first inclined side D4.

[0079] Also, for example, the first end 25a of the sipe 25 may be connected to the side ends 10b, 10c of the second intermediate land 10 in the tire width direction D1, and the second end 25b of the sipe 25 may be separated from the side ends 10b, 10c of the second intermediate land 10 in the tire width direction D1. That is, the first end 25a of the sipe 25 may be connected to the main grooves 4, 6, and the second end 25b of the sipe 25 may be separated from the main grooves 4, 6.

[0080] Also, the sipe 25 may have, for example, a straight portion 25c extending straight and a zigzag portion 25d extending zigzag. For example, as in this embodiment, the circumferential groove 15 may intersect with the zigzag portion 25d of the sipe 25. For example, as in this embodiment, in the sipe 25 of the second intermediate land 10, the length of the zigzag portion 25d may be longer than the length of the straight portion 25c.

[0081] Also, for example, as in this embodiment, the straight portion 25c may be arranged on the first end 25a side of the sipe 25, and the zigzag portion 25d may be arranged on the second end 25b side of the sipe 25. Also, for example, as in this embodiment, the slit 20 of the second intermediate land 10 and the sipe 25 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1.

[0082] Next, the configuration of the second shoulder land 8 will be described with reference to FIG.

[0083] For example, when a vehicle brakes, a large force is likely to act on the second shoulder land 8. In response to this, for example, as shown in Fig. 9, a circumferential groove (also called "second shoulder circumferential groove") 13 of the second shoulder land 8 may be separated from each of a pair of slits (also called "second shoulder slits") 18, 18 that divide a block (also called "second shoulder block") 8a.

[0084] This can suppress a decrease in the rigidity of the end of the block 8a in the tire circumferential direction D3, and therefore suppress a decrease in the rigidity of the block 8a. Therefore, for example, the dry road performance (particularly, the braking performance) can be improved. Although not particularly limited, for example, as in this embodiment, the groove width of the circumferential groove 13 may be larger than the groove width of the sipe 23 and smaller than the groove width of the slit 18.

[0085] Also, the circumferential groove 13 (specifically, the groove width center) extends at an angle with respect to the tire circumferential direction D3. This allows the length of the circumferential groove 13 on the second shoulder land 8 to be increased, thereby increasing the traction of the edge of the circumferential groove 13 on snowy road surfaces. This improves snowy road performance (especially the steering stability by preventing skidding).

[0086] Although not particularly limited, the angle at which the circumferential groove 13 is inclined with respect to the tire circumferential direction D3 is preferably, for example, 1° or more, and, for example, 10° or less. Also, for example, as in this embodiment, the circumferential groove 13 and the slits 18 may be inclined toward opposite sides D5, D4 with respect to the tire circumferential direction D3. Specifically, in this embodiment, the circumferential groove 13 extends with an inclination toward the second inclined side D5, and the slits 18 extend with an inclination toward the first inclined side D4.

[0087] Also, for example, as in this embodiment, the first end 23a (outer end in the tire width direction D1) of the sipe 23 may be connected to the outer end 8b of the second shoulder land 8 in the tire width direction D1, and the second end 23b (inner end in the tire width direction D1) of the sipe 23 may be separated from the inner end 8c in the tire width direction D1 of the second shoulder land 8. In other words, the first end 23a of the sipe 23 may be connected to the second ground-contact edge 2e, and the second end 23b of the sipe 23 may be separated from the second shoulder main groove 4.

[0088] Also, the sipe 23 may have, for example, a straight portion 23c extending straight and a zigzag portion 23d extending zigzag. For example, as in this embodiment, the circumferential groove 13 may intersect with the zigzag portion 23d of the sipe 23. For example, as in this embodiment, in the sipe 23 of the second shoulder land 8, the length of the zigzag portion 23d may be longer than the length of the straight portion 23c.

[0089] Also, for example, as in this embodiment, the straight portion 23c may be disposed on the inside of the sipe 23 in the tire width direction D1, and the zigzag portion 23d may be disposed on the outside of the sipe 23 in the tire width direction D1. Also, for example, as in this embodiment, the slit 18 of the second shoulder land 8 and the sipe 23 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1.

[0090] 5 to 9, for example, like this embodiment, the slits 17, 18, 19, 20, 21 of each land 7, 8, 9, 10, 11 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1. Also, for example, like this embodiment, the sipes 22, 23, 24, 25, 26 of each land 7, 8, 9, 10, 11 may be inclined to the same side (first inclined side) D4 with respect to the tire width direction D1.

[0091] As described above, as in the present embodiment, the pneumatic tire 1 includes a plurality of main grooves 3, 4, 5, 6 extending in the tire circumferential direction D3, and a plurality of lands 7, 8, 9, 10, 11 defined by the plurality of main grooves 3, 4, 5, 6 and a pair of ground contact edges 2d, 2e. The plurality of lands 7, 8, 9, 10, 11 include first and second shoulder lands 7, 8 disposed on the outermost sides in the tire width direction D1, and a center land 11 disposed closest to the tire equatorial plane S1. The first shoulder land 7 includes a plurality of first shoulder slits 17 extending across the tire width direction D1, and a first shoulder block 7a defined by a pair of first shoulder slits 17, 17 adjacent to each other in the tire circumferential direction D3 among the plurality of first shoulder slits 17. It is preferable that the shoulder block 7a has at least one first shoulder circumferential groove 12 extending in the tire circumferential direction D3, and the at least one first shoulder circumferential groove 12 is spaced apart from each of the pair of first shoulder slits 17, 17, the center land 11 has a plurality of center slits 21 extending across the tire width direction D1, and a center block 11a defined by a pair of center slits 21, 21 adjacent to each other in the tire circumferential direction D3 among the plurality of center slits 21, and the center block 11a has at least one center circumferential groove 16 extending in the tire circumferential direction D3, and the at least one center circumferential groove 16 is connected to each of the pair of center slits 21, 21.

[0092] According to this configuration, since the first shoulder circumferential groove 12 is spaced apart from the pair of first shoulder slits 17, 17, it is possible to suppress a decrease in rigidity of the end portion of the first shoulder block 7a in the tire circumferential direction D3. This makes it possible to suppress a decrease in rigidity of the first shoulder block 7a.

[0093] When the vehicle travels straight, the contact length of the inner region in the tire width direction D1 becomes longer, so the center circumferential groove 16 is connected to each of the pair of center slits 21, 21. This allows the length of the center circumferential groove 16, which makes multiple contacts with the ground, to be longer, increasing traction on snowy roads by the edges of the center circumferential groove 16. This improves snowy road performance while ensuring the rigidity of the blocks 7a.

[0094] Furthermore, as in this embodiment, in the pneumatic tire 1, the multiple lands 7, 8, 9, 10, 11 further include a first intermediate land 9 arranged between the first shoulder land 7 and the center land 11, and the first intermediate land 9 has a plurality of first intermediate slits 19 extending across the tire width direction D1, and a first intermediate block 9a defined by a pair of first intermediate slits 19, 19 adjacent to each other in the tire circumferential direction D3 among the multiple first intermediate slits 19, and the first intermediate block 9a has at least one first intermediate circumferential groove 14 extending in the tire circumferential direction D3, and the at least one first intermediate circumferential groove 14 is preferably spaced apart from each of the pair of first intermediate slits 19, 19.

[0095] According to this configuration, since the first mediate circumferential groove 14 is separated from the pair of first mediate slits 19, 19, it is possible to suppress a decrease in rigidity of the end portion of the first mediate block 9a in the tire circumferential direction D3. This makes it possible to suppress a decrease in rigidity of the first mediate block 9a.

[0096] In addition, as in this embodiment, in the pneumatic tire 1, it is preferable that the at least one first intermediate circumferential groove 14 is positioned further inward in the tire width direction D1 than the center L1 of the first intermediate block 9a in the tire width direction D1.

[0097] According to this configuration, the ground pressure of the inner region of the first mediate block 9a in the tire width direction D1 becomes low during cornering, and the traction by the edge of the inner region tends to become small, but the first mediate circumferential groove 14 is arranged on the inner side in the tire width direction D1 than the center L1 of the first mediate block 9a in the tire width direction D1. This makes it possible to lengthen the edge length of the inner region of the first mediate block 9a, and therefore to prevent the traction of the inner region of the first mediate block 9a from becoming small during cornering on a snowy road surface.

[0098] Furthermore, as in this embodiment, in the pneumatic tire 1, the multiple lands 7, 8, 9, 10, 11 further include a second intermediate land 10 arranged between the second shoulder land 8 and the center land 11, and the second intermediate land 10 includes a multiple second intermediate slits 20 extending across the tire width direction D1, and a second intermediate block 10a defined by a pair of second intermediate slits 20, 20 adjacent to each other in the tire circumferential direction D3 among the multiple second intermediate slits 20, and the second intermediate block 10a includes at least one second intermediate circumferential groove 15 extending in the tire circumferential direction D3, and the at least one second intermediate circumferential groove 15 is connected to one of the pair of second intermediate slits 20, 20 and is separated from one of the pair of second intermediate slits 20, 20.

[0099] According to this configuration, the second mediate circumferential groove 15 is connected to one of the pair of second mediate slits 20, 20, so that the length of the second mediate circumferential groove 15 can be secured. This ensures traction by the edge of the second mediate circumferential groove 15 on snowy road surfaces, so that snowy road performance can be secured.

[0100] In addition, since the second mediate circumferential groove 15 is separated from one of the pair of second mediate slits 20, 20, it is possible to suppress a decrease in the rigidity of one end of the second mediate block 10a in the tire circumferential direction D3. This makes it possible to suppress a decrease in the rigidity of the second mediate block 10a.

[0101] In the pneumatic tire 1 according to the present embodiment, the at least one second intermediate circumferential groove 15 preferably extends so as to be inclined with respect to the tire circumferential direction D3.

[0102] According to this configuration, the second mediate circumferential groove 15 extends at an angle with respect to the tire circumferential direction D3, so that it is possible to increase the length of the second mediate circumferential groove 15. This increases the traction by the edge of the second mediate circumferential groove 15 on snowy road surfaces, thereby improving snowy road performance.

[0103] The pneumatic tire 1 is not limited to the configuration of the above-described embodiment, and is not limited to the above-described action and effect. Of course, various modifications can be made to the pneumatic tire 1 without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations, methods, etc. of the various modified examples described below and adopt them in the configurations, methods, etc. of the above-described embodiment.

[0104] (1) In the pneumatic tire 1 according to the above embodiment, the first mediate circumferential groove 14 is configured to be spaced apart from each of the pair of first mediate slits 19, 19. However, the pneumatic tire 1 is not limited to such a configuration. For example, the first mediate circumferential groove 14 may be configured to be connected to at least one of the pair of first mediate slits 19, 19.

[0105] (2) In the pneumatic tire 1 according to the above embodiment, the first intermediate circumferential groove 14 is disposed on the inner side in the tire width direction D1 of the center L1 of the first intermediate block 9a in the tire width direction D1. However, the pneumatic tire 1 is not limited to such a configuration.

[0106] For example, the first mediate circumferential groove 14 may be arranged on the outer side of the center L1 of the first mediate block 9a in the tire width direction D1. Also, for example, the first mediate circumferential groove 14 may be arranged to intersect with the center L1 of the first mediate block 9a in the tire width direction D1.

[0107] (3) In the pneumatic tire 1 according to the above embodiment, the second mediate circumferential groove 15 is connected to one of the pair of second mediate slits 20, 20 and separated from the other. However, the pneumatic tire 1 is not limited to such a configuration. For example, the second mediate circumferential groove 15 may be connected to each of the pair of second mediate slits 20, 20, or may be separated from each of the pair of second mediate slits 20, 20.

[0108] (4) In the pneumatic tire 1 according to the above embodiment, the second intermediate circumferential groove 15 extends at an angle with respect to the tire circumferential direction D3. However, the pneumatic tire 1 is not limited to this configuration. For example, the second intermediate circumferential groove 15 may extend parallel to the tire circumferential direction D3.

[0109] (5) In addition, in the pneumatic tire 1 according to the above embodiment, there is one land 11 that intersects with the tire equatorial plane S1, and the center land 11 that is disposed closest to the tire equatorial plane S1 is the land. However, the pneumatic tire 1 is not limited to such a configuration.

[0110] For example, the number of lands intersecting the tire equatorial plane S1 may be zero, or may be two. In these configurations, two center lands 11 are provided that are located closest to the tire equatorial plane S1, but it is sufficient that the first center land 11 and the first shoulder land 7, which are located on the first width direction side D11, among the first and second center lands 11 and the first and second shoulder lands 7, 8, have a predetermined configuration.

[0111] The specified configuration means that at least one first shoulder circumferential groove 12 of the block 7a of the first shoulder land 7 is separated from each of a pair of first shoulder slits 17, 17, and at least one center circumferential groove 16 of the block 11a of the first center land 11 is connected to each of a pair of center slits 21, 21.

[0112] (6) Furthermore, the pneumatic tire 1 according to the above embodiment is configured as a tire for which the mounting orientation on a vehicle is specified. However, the pneumatic tire 1 is not limited to such a configuration. For example, the pneumatic tire 1 may be configured as a tire for which the mounting orientation on a vehicle is not specified. Specifically, the tread pattern may be a tread pattern that is point-symmetric with respect to an arbitrary point on the tire equator line, or a tread pattern that is line-symmetric with respect to the tire equator line. [Explanation of symbols]

[0113] 1...pneumatic tire, 1a...bead, 1b...sidewall, 1c...carcass, 1d...inner liner, 1e...sidewall rubber, 2...tread, 2a...tread surface, 2b...tread rubber, 2c...belt, 2d...first ground contact edge, 2e...second ground contact edge, 3...first shoulder main groove, 4...second shoulder main groove, 5...first center main groove, 6...second center main groove, 7...first shoulder land, 7a...first shoulder block, 7b,8b,9b...outer end, 7c,8c,9c... Inner end, 8...second shoulder land, 8a...second shoulder block, 9...first mediate land, 9a...first mediate block, 10...second mediate land, 10a...second mediate block, 10b...side end, 10b...side end, 11...center land, 11a...center block, 11b...first end, 11c...second end, 12...first shoulder circumferential groove, 13...second shoulder circumferential groove, 14...first mediate circumferential groove, 15...second mediate circumferential groove, 15a...inner circumferential groove, 15 b...center circumferential groove, 16...center circumferential groove, 17...first shoulder slit, 18...second shoulder slit, 19...first intermediate slit, 20...second intermediate slit, 20a...shallow groove slit, 20b...deep groove slit, 20c...projection, 21...center slit, 22...first shoulder sipe, 22a, 23a, 24a, 25a, 26a...first end, 22b, 23b, 24b, 25b, 26b...second end, 22c, 23c, 24c, 25c, 26c...strip Rate portion, 22d, 23d, 24d, 25d, 26d...zigzag portion, 23...second shoulder sipe, 24...first intermediate sipe, 25...second intermediate sipe, 26...center sipe, 30...rim, D1...tire width direction, D2...tire radial direction, D3...tire circumferential direction, D4...first inclined side, D5...second inclined side, D11...first width direction side (vehicle outer side), D12...second width direction side (vehicle inner side), D31...first circumferential side, D32...second circumferential side, S1...tire equatorial plane

Claims

1. A tire has a plurality of main grooves extending in a circumferential direction of the tire, and a plurality of lands defined by the plurality of main grooves and a pair of ground contact edges, The plurality of lands include first and second shoulder lands arranged on the outermost sides in the tire width direction, and a center land arranged closest to a tire equatorial plane, The first shoulder land includes a plurality of first shoulder slits extending in the tire width direction, and a first shoulder block defined by a pair of first shoulder slits adjacent to each other in the tire circumferential direction among the plurality of first shoulder slits, The first shoulder block includes at least one first shoulder circumferential groove extending in the tire circumferential direction, The at least one first shoulder circumferential groove is spaced from each of the pair of first shoulder slits, The second shoulder land includes a plurality of second shoulder slits extending in the tire width direction, and a second shoulder block defined by a pair of second shoulder slits adjacent to each other in the tire circumferential direction among the plurality of second shoulder slits, The second shoulder block includes at least one second shoulder circumferential groove extending in the tire circumferential direction, The at least one second shoulder circumferential groove is spaced apart from each of the pair of second shoulder slits, The center land includes a plurality of center slits extending in the tire width direction, and a center block defined by a pair of center slits adjacent to each other in the tire circumferential direction among the plurality of center slits, The center block includes at least one center circumferential groove extending in the tire circumferential direction, The at least one central circumferential groove is connected to each of the pair of central slits.

2. A tire comprising a plurality of main grooves extending in a circumferential direction of the tire, and a plurality of lands defined by the plurality of main grooves and a pair of ground contact edges, The plurality of lands include first and second shoulder lands arranged on the outermost sides in the tire width direction, and a center land arranged closest to a tire equatorial plane, The first shoulder land includes a plurality of first shoulder slits extending in the tire width direction, and a first shoulder block defined by a pair of first shoulder slits adjacent to each other in the tire circumferential direction among the plurality of first shoulder slits, The first shoulder block includes at least one first shoulder circumferential groove extending in the tire circumferential direction, The at least one first shoulder circumferential groove is spaced from each of the pair of first shoulder slits, The center land includes a plurality of center slits extending in the tire width direction, and a center block defined by a pair of center slits adjacent to each other in the tire circumferential direction among the plurality of center slits, The center block includes at least one center circumferential groove extending in the tire circumferential direction, The at least one central circumferential groove is connected to each of the pair of central slits, The plurality of lands further includes a first intermediate land disposed between the first shoulder land and the center land, The first mediate land includes a plurality of first mediate slits extending in the tire width direction, and a first mediate block defined by a pair of first mediate slits adjacent to each other in the tire circumferential direction among the plurality of first mediate slits, The first mediate block includes at least one first mediate circumferential groove extending in the tire circumferential direction, The at least one first mediate circumferential groove is spaced from each of the pair of first mediate slits.

3. The pneumatic tire according to claim 2 , wherein the at least one first mediate circumferential groove is disposed on an inner side in the tire width direction than a center in the tire width direction of the first mediate block.

4. The plurality of lands further includes a second intermediate land disposed between the second shoulder land and the center land, The second mediate land includes a plurality of second mediate slits extending in the tire width direction, and a second mediate block defined by a pair of second mediate slits adjacent to each other in the tire circumferential direction among the plurality of second mediate slits, The second mediate block includes at least one second mediate circumferential groove extending in the tire circumferential direction, The pneumatic tire according to any one of claims 1 to 3, wherein the at least one second mediate circumferential groove is connected to one of the pair of second mediate slits and is separated from one of the pair of second mediate slits.

5. A tire comprising a plurality of main grooves extending in a circumferential direction of the tire, and a plurality of lands defined by the plurality of main grooves and a pair of ground contact edges, The plurality of lands include first and second shoulder lands arranged on the outermost sides in the tire width direction, and a center land arranged closest to a tire equatorial plane, The first shoulder land includes a plurality of first shoulder slits extending in the tire width direction, and a first shoulder block defined by a pair of first shoulder slits adjacent to each other in the tire circumferential direction among the plurality of first shoulder slits, The first shoulder block includes at least one first shoulder circumferential groove extending in the tire circumferential direction, The at least one first shoulder circumferential groove is spaced from each of the pair of first shoulder slits, The center land includes a plurality of center slits extending in the tire width direction, and a center block defined by a pair of center slits adjacent to each other in the tire circumferential direction among the plurality of center slits, The center block includes at least one center circumferential groove extending in the tire circumferential direction, The at least one central circumferential groove is connected to each of the pair of central slits, The plurality of lands further includes a second intermediate land disposed between the second shoulder land and the center land, The second mediate land includes a plurality of second mediate slits extending in the tire width direction, and a second mediate block defined by a pair of second mediate slits adjacent to each other in the tire circumferential direction among the plurality of second mediate slits, The second mediate block includes at least one second mediate circumferential groove extending in the tire circumferential direction, The at least one second mediate circumferential groove is connected to one of the pair of second mediate slits and is spaced apart from the one of the pair of second mediate slits; The at least one second mediate circumferential groove extends at an angle with respect to the tire circumferential direction.

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