Tire

Abstract

According to the invention, excellent noise performance and wetland road holding performance are obtained. The present invention is provided with: a first main groove (21), a second main groove (22), a third main groove (23), and a fourth main groove (24), the groove width of the outermost side in the vehicle width direction being formed narrower than the groove width of the innermost side in the vehicle width direction; a first land section (31), a second land section (32), a third land section (33), a fourth land section (34), and a fifth land section (35) provided from the inside in the vehicle width direction to the outside in the vehicle width direction; a narrow groove (351) of the fifth land portion (35); a first sipe (311), one end of which penetrates the first main groove (21) but does not penetrate the first main groove (21); a second sipe (321); a third sipe (331); a fourth sipe (341); a fifth sipe (352) having one end penetrating the narrow groove (351) but not penetrating the narrow groove (351); and a fifth lug groove (353); wherein the number of the second sipes (321) is at least twice the number of the sipes (331) and (341), the sipes (321), (341) and (351) are inclined in the same direction with respect to the tire width direction, and the first sipes (311), the fifth sipes (352) and the fifth lug grooves (353) have an inclination in the same direction.

Description

Technical Field

[0001] The present invention relates to a tire. Background Art

[0002] For example, Patent Document 1 discloses a pneumatic tire that can improve wet driving stability while ensuring vehicle exterior noise performance.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: WO 2018 / 151108 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] To improve noise performance (NV: Noise Vibration), it is effective to reduce the groove width and groove volume of the tread. However, if the groove width and groove volume are reduced, drainage cannot be ensured, resulting in a problem of poor wet grip performance.

[0008] An object of the present invention is to provide a tire that can achieve excellent noise performance and wet grip performance.

[0009] Means for Solving the Problems

[0010] To achieve the above object, a tire according to one aspect of the present invention is a tire that specifies the orientation with respect to the vehicle width direction when mounted on a vehicle and has an asymmetric tread pattern on the tread surface with the tire equatorial plane as a boundary. The tread pattern includes: first, second, third, and fourth main grooves that extend in the tire circumferential direction and are provided in four numbers from the inner side in the vehicle width direction to the outer side in the vehicle width direction in the tire width direction, and at least the groove width of the outermost groove in the vehicle width direction is formed to be narrower than that of the innermost groove in the vehicle width direction; first, second, third, fourth, and fifth land portions that are divided by the respective main grooves, extend in a rib shape in the tire circumferential direction, and are provided in five numbers along the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction; fine grooves that extend in the tire circumferential direction in the fifth land portion and are provided in at least one number in the tire width direction, and the groove width is narrower than that of the fourth main groove; first sipes that penetrate to the first main groove at one end but do not penetrate through in the first land portion and extend to the outer side in the tire width direction at the other end, and are provided in a plurality of numbers in the tire circumferential direction and are the only ones in the first land portion; second sipes that extend in the tire width direction in the second land portion and are provided in a plurality of numbers in the tire circumferential direction; third sipes that extend in the tire width direction in the third land portion and are provided in a plurality of numbers in the tire circumferential direction; fourth sipes that extend in the tire width direction in the fourth land portion and are provided in a plurality of numbers in the tire circumferential direction; fifth sipes that penetrate to the fine groove at one end but do not penetrate through in the fifth land portion and extend to the outer side in the tire width direction at the other end, and are provided in a plurality of numbers in the tire circumferential direction and are the only ones outside the fine groove in the tire width direction; fifth transverse grooves that penetrate to the fourth main groove at one end in the fifth land portion, extend to the outer side in the tire width direction at the other end, and terminate without penetrating to the fine groove, and are provided in a plurality of numbers in the tire circumferential direction; the number of the second sipes is more than twice that of the third sipes or the fourth sipes, and the sipes or grooves provided in the second land portion, the third land portion, and the fourth land portion are provided to be inclined in the same direction with respect to the vehicle width direction, and the first sipes, the fifth sipes, and the fifth transverse grooves have the same inclination as the sipes or the grooves provided in the second land portion, the third land portion, and the fourth land portion.

[0011] Advantages of the Invention

[0012] According to the present invention, the noise performance and the wet grip performance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a meridian sectional view of a pneumatic tire according to an embodiment.

[0014] Figure 2 is a top view of the tread surface of a pneumatic tire according to an embodiment.

[0015] Figure 3 It is a partially enlarged top view of the tread of a pneumatic tire according to an embodiment.

[0016] Figure 4 It is a partially enlarged top view of the tread of a pneumatic tire according to an embodiment.

[0017] Figure 5 It is a three-dimensional schematic diagram of the sipe pattern of a pneumatic tire according to an embodiment.

[0018] Figure 6 It is a three-dimensional schematic diagram of another example of the sipe pattern of a pneumatic tire according to an embodiment.

[0019] Figure 7 It is a graph showing the results of performance tests of a pneumatic tire according to an embodiment.

[0020] Figure 8 It is a graph showing the results of performance tests of a pneumatic tire according to an embodiment. Detailed Embodiments

[0021] Hereinafter, based on the drawings, embodiments of the pneumatic tire of the present invention will be described in detail. It should be noted that the present invention is not limited to this embodiment. In addition, among the constituent elements of this embodiment, there are elements that can be replaced while maintaining the identity of the invention and the replacement is obvious. Furthermore, multiple improvement examples described in this embodiment can be arbitrarily combined within the range obvious to those skilled in the art.

[0022] In the following description, the tire radial direction refers to the direction orthogonal to the tire rotation axis (not shown) that is the rotation axis of the pneumatic tire 1. The inner side in the tire radial direction refers to the side facing the tire rotation axis in the tire radial direction, and the outer side in the tire radial direction refers to the side away from the tire rotation axis in the tire radial direction. Further, the tire circumferential direction refers to the circumferential direction centered on the tire rotation axis. In addition, the tire width direction refers to the direction parallel to the tire rotation axis. The inner side in the tire width direction refers to the side facing the tire equatorial plane (tire equator line) CL in the tire width direction, and the outer side in the tire width direction refers to the side away from the tire equatorial plane CL in the tire width direction. The tire equatorial plane CL is a plane that is orthogonal to the tire rotation axis and passes through the center of the tire width of the pneumatic tire 1. The position of the tire equatorial plane CL in the tire width direction coincides with the tire width direction center line that is the center position of the pneumatic tire 1 in the tire width direction. The tire width is the width in the tire width direction between the outermost portions located in the tire width direction, that is, the distance between the portions that are farthest from the tire equatorial plane CL in the tire width direction. The tire equator line is a line located on the tire equatorial plane CL and extending along the tire circumferential direction of the pneumatic tire 1. Further, the cross-section in the tire meridian direction (meridian cross-section) refers to the cross-section when the tire is cut in a plane including the tire rotation axis.

[0023] In addition, the inner side in the vehicle width direction and the outer side in the vehicle width direction are defined as the orientations with respect to the vehicle width direction (tire width direction) when the tire is mounted on the vehicle. Specifically, the pneumatic tire 1 includes a mounting display portion (not shown) that indicates the mounting direction of the tire with respect to the vehicle. The mounting direction display portion is formed, for example, by marks or irregularities marked on the sidewall portion of the tire. For example, ECE R30 (Regulation No. 30 of the Economic Commission for Europe) requires that a display portion of the vehicle mounting direction be provided on the sidewall portion that is the outer side in the vehicle width direction in the vehicle-mounted state. The pneumatic tire 1 of the present embodiment designates the orientation with respect to the vehicle width direction when mounted on the vehicle.

[0024] As Figure 1 shown, the pneumatic tire 1 of the present embodiment has an annular structure centered on the tire rotation axis and includes: a pair of bead cores 11, 11; a pair of sidewall cores 12, 12; a carcass ply 13; a belt ply 14; a tread rubber 15; a pair of sidewall rubbers 16, 16; and a pair of rim cushion rubbers 17, 17.

[0025] The pair of bead cores 11, 11 has an annular structure formed by winding bead wires made of steel or organic fiber material multiple times in the tire circumferential direction and constitutes the cores of the left and right bead portions.

[0026] The pair of sidewall cores 12, 12 are respectively disposed on the outer periphery in the tire radial direction of the pair of bead cores 11, 11 and constitute the bead portions.

[0027] The carcass layer 13 has a single-layer structure formed by one carcass ply or a multi-layer structure formed by laminating multiple carcass plies, and is annularly disposed between the left and right bead cores 11, 11 to form the skeleton of the tire. In addition, both end portions of the carcass layer 13 are wound back in a manner that wraps the bead core 11 and the bead apex 12 and are fixed to the outer side in the tire width direction. Further, the carcass ply of the carcass layer 13 is formed by coating rubber to cover a plurality of carcass cords formed of steel or organic fiber materials (e.g., aramid, nylon, polyester, rayon, etc.) and performing rolling processing, and has a carcass angle with an absolute value of 80° or more and 95° or less (defined as the inclination angle of the length direction of the carcass cord with respect to the tire circumferential direction).

[0028] The belt layer 14 is formed by laminating a pair of crossed belts 141, 142 and a belt cover layer 143, and is disposed to surround the outer periphery of the carcass layer 13. The pair of crossed belts 141, 142 are formed by coating rubber to cover a plurality of belt cords formed of steel or organic fiber materials and performing rolling processing, and have a belt angle with an absolute value between 20° and 55°. In addition, the pair of crossed belts 141, 142 have belt angles of opposite signs (defined as the inclination angle of the length direction of the belt cord with respect to the tire circumferential direction), and the length directions of the belt cords cross each other and are laminated (so-called cross-ply structure). The belt cover layer 143 is formed by coating rubber to cover belt cords formed of steel or organic fiber materials, and has a belt angle with an absolute value of 0° or more and 10° or less. In addition, the belt cover layer 143 is, for example, a strip formed by coating rubber to cover one or more belt cords, and is formed by spirally winding the strip around the outer peripheral surface of the crossed belts 141, 142 in the tire circumferential direction for multiple turns.

[0029] The tread rubber 15 is disposed on the outer periphery in the tire radial direction of the carcass layer 13 and the belt layer 14 to form the tread portion of the tire. In addition, on the tread portion, the tread rubber 15 forms a tread 15a on the outer peripheral surface that contacts the road surface during driving.

[0030] A pair of sidewall rubbers 16, 16 are respectively disposed on the outer side in the tire width direction of the carcass layer 13 to form the left and right sidewall portions.

[0031] A pair of rim cushion rubbers 17, 17 are respectively disposed on the inner side in the tire radial direction of the two bead cores 11, 11 and the wound-back portion of the carcass layer 13, and form the contact surfaces of the left and right bead portions with respect to the rim flange.

[0032] In addition, as Figure 1 and Figure 2As shown, the pneumatic tire 1 of the embodiment has a tread pattern 15b on the tread 15a. The tread pattern 15b of an all-season tire is shown on the pneumatic tire 1 of the embodiment. The tread pattern 15b shown on the pneumatic tire 1 of the embodiment is asymmetric in the tire width direction with the tire equatorial plane CL as the boundary.

[0033] As Figure 2 shown, in the tread pattern 15b, in the tire width direction, four circumferential main grooves, namely a first main groove 21, a second main groove 22, a third main groove 23, and a fourth main groove 24, are included from the inner side in the vehicle width direction to the outer side in the vehicle width direction, and they extend in the tire circumferential direction. In the tread pattern 15b, from the inner side in the vehicle width direction to the outer side in the vehicle width direction, a first land portion 31, a second land portion 32, a third land portion 33, a fourth land portion 34, and a fifth land portion 35 are included in the tire width direction. They are divided by the four main grooves 21, 22, 23, and 24 and extend in a rib shape in the tire circumferential direction. The first land portion 31 and the fifth land portion 35 are also referred to as shoulder land portions on the outer side in the tire width direction, and the second land portion 32, the third land portion 33, and the fourth land portion 34 are also referred to as central land portions on the inner side in the tire width direction. The tread pattern 15b includes a first sipe 311 in the first land portion 31. The tread pattern 15b includes a second sipe 321 in the second land portion 32. The tread pattern 15b includes a third sipe 331 in the third land portion 33. The tread pattern 15b includes a fourth sipe 341 in the fourth land portion 34. The tread pattern 15b includes a fine groove 351, a fifth sipe 352, and a fifth transverse groove 353 in the fifth land portion 35. Additionally, regarding the tread pattern 15b, as Figure 3 shown, the tread pattern 15b includes a second transverse groove 322 in the second land portion 32. Additionally, as Figure 4 shown, the tread pattern 15b includes a third transverse groove 332 in the third land portion 33. The tread pattern 15b includes a fourth transverse groove 342 in the fourth land portion 34.

[0034] Here, the main groove refers to the groove that is obliged to display the wear indicator specified in JATMA, generally having a groove width of 4.0 [mm] or more and a groove depth of 6.5 [mm] or more. In addition, the transverse groove refers to the transverse groove extending in the tire width direction, generally having a groove width of 1.0 [mm] or more and less than 6.0 [mm] and a groove depth of 3.0 [mm] or more and less than 6.5 [mm], and is open when the tire is in contact with the ground to function as a groove. Further, the fine groove refers to the longitudinal groove extending in the tire circumferential direction, generally having a groove width of 1.0 [mm] or more and less than 4.0 [mm] and a groove depth of 3.0 [mm] or more and less than 6.5 [mm], and is open when the tire is in contact with the ground to function as a groove. Additionally, the siped tread refers to the cut groove formed on the tread surface of the tire, generally having a siped tread width of less than 1.0 [mm] and a siped tread depth of 2.0 [mm] or more, and is closed when the tire is in contact with the ground.

[0035] Regarding the groove width, the measurement is the maximum value of the distance between the left and right groove walls on the tread surface in the unloaded state where the tire is mounted on the specified rim and filled with the specified internal pressure. In the case of the bead area having a notch or chamfer at the edge portion, in the cross-sectional view with the groove length direction as the normal direction, the groove width is measured based on the intersection point of the extended lines of the tread surface and the groove wall.

[0036] Regarding the groove depth, the measurement is the maximum value of the distance from the tread surface to the groove bottom in the unloaded state where the tire is mounted on the specified rim and filled with the specified internal pressure. In addition, in the case where the groove has local unevenness or siped tread at the groove bottom, the groove depth is measured excluding these unevenness or siped tread.

[0037] Regarding the siped tread width, the measurement is the maximum value of the opening width of the siped tread on the tread surface of the bead area in the unloaded state where the tire is mounted on the specified rim and filled with the specified internal pressure.

[0038] The tire contact surface with the ground is defined as the contact surface between the tire and the flat plate when the tire is mounted on the specified rim, given the specified internal pressure, placed vertically relative to the flat plate in a stationary state, and a load corresponding to the specified load is applied.

[0039] The specified rim means the "applicable rim" specified by JATMA, the "Design Rim" specified by TRA, or the "Measuring Rim" specified by ETRTO. In addition, the specified internal pressure means the "maximum air pressure" specified by JATMA, the maximum value of the "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" specified by TRA, or the "INFLATION PRESSURES" specified by ETRTO. In addition, the specified load means the "maximum load capacity" specified by JATMA, the maximum value of the "TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES" specified by TRA, or the "LOAD CAPACITY" specified by ETRTO. However, in JATMA, in the case of passenger car tires, the specified internal pressure is 180 [kPa] of air pressure, and the specified load is 88 [%] of the maximum load capacity.

[0040] The tread pattern 15b will be described in detail below.

[0041] As Figure 2 shown, regarding the first main groove 21, the second main groove 22, the third main groove 23, and the fourth main groove 24, from the inner side in the vehicle width direction to the outer side in the vehicle width direction, the fourth main groove 24 on the outermost side in the vehicle width direction has the narrowest groove width compared to the other main grooves 21, 22, 23. The main grooves 21, 22, 23 other than the fourth main groove 24 on the outermost side in the vehicle width direction have the same or narrower groove width from the inner side in the vehicle width direction to the outer side in the vehicle width direction. The groove width relationship of the main grooves includes: among the 4 main grooves, the first main groove 21 has the widest groove width, the second main groove 22 and the third main groove 23 have the same groove width and are narrower than the first main groove 21, and the fourth main groove 24 has the narrowest groove width. Regarding the pneumatic tire 1 of the embodiment, in terms of obtaining the effects of the present invention, the groove width of the fourth main groove 24 on the outermost side in the vehicle width direction is preferably formed to be 75 [%] or less with respect to the first main groove 21 on the innermost side in the vehicle width direction.

[0042] As Figure 2As shown, the first sipe 311 of the first land portion 31 is formed by penetrating the first main groove 21 at one end and extending outward in the tire width direction at the other end. One end of the first sipe 311 becomes a junction point that does not penetrate the first main groove 21. That is, the first sipe 311 is arranged at a position staggered in the tire circumferential direction so as to avoid the presence of a second sipe 321 penetrating from one side of the second land portion 32 on the extension line at the position penetrating the first main groove 21. A plurality of first sipes 311 are arranged in the tire circumferential direction. The spacing of the first sipes 311 in the tire circumferential direction may be unequally spaced according to the change in spacing. The first sipe 311 is uniquely formed on the first land portion 31, and no groove is formed on the first land portion 31 except for this. It is called a sipe pattern tone.

[0043] In terms of obtaining the effects of the present invention, the first sipe 311 is preferably as follows: Figure 5 and Figure 6 The first sipe 311 of the embodiment is formed into a three-dimensional shape like the sipe 101 shown. Figure 6 The three-dimensional shape of the sipe 101 is shown.

[0044] Figure 5 The sipe pattern 101 shown is formed by bending the opening 101a opened on the tread 15a. Figure 5 The sipes 101 shown are formed with sipe walls 101b facing each other in the radial direction of the tire, and at least one of the sipe walls 101b is formed with a concave-convex 101c. Figure 5 In the embodiment, the concavo-convex 101c is formed as a concave portion (shallow concave portion) on one sipe wall 101b. In addition, the other sipe wall 101b facing the one sipe wall 101b having the concave portion may not have a concavo-convex portion, or may have a convex portion extending into the shallow concave portion. In this way, Figure 5 The sipes 101 shown are formed into a three-dimensional shape. Figure 6 The sipe pattern 101 shown is formed by bending an opening 101a opened on the tread 15a. Figure 6 The sipes 101 shown are formed with sipe walls 101b in the tire radial direction facing each other, and each sipe wall 101b is formed into a waveform 101d that curves (or zigzags) toward the tire radial direction. Figure 6 The illustrated sipe 101 is formed into a three-dimensional shape.

[0045] like Figure 2 and Figure 3As shown, the second cut groove pattern 321 of the second circumferential rib portion 321 is formed by extending in the tire width direction. A plurality of the second transverse grooves 321 are arranged in the tire circumferential direction. According to the pitch variation, the pitch of the second cut groove pattern 321 in the tire circumferential direction can be unequal intervals. The number of the second cut groove patterns 321 is more than twice that of the third cut groove pattern 331 and the fourth cut groove pattern 341. As Figure 3 shown, the second transverse groove 322 of the second circumferential rib portion 32 is formed by extending in the tire width direction. A plurality of the second transverse grooves 322 are arranged in the tire circumferential direction. According to the pitch variation, the pitch of the second transverse groove 322 in the tire circumferential direction can be unequal intervals. The second circumferential rib portion 32 is formed only by the second cut groove pattern 321 and the second transverse groove 322.

[0046] As Figure 3 shown, these second transverse grooves 322 and the second cut groove patterns 321 are formed continuously with each other. Specifically, one end of the second transverse groove 322 penetrates to the first main groove 21 or the second main groove 22, and the other end terminates within the second circumferential rib portion 32. And, one end of the second cut groove pattern 321 penetrates to the second main groove 22 or the first main groove 21, and the other end penetrates to the other end of the second transverse groove 322. That is, when one end of the second transverse groove 322 penetrates to the first main groove 21, one end of the second cut groove pattern 321 penetrates to the second main groove 22, and the other end penetrates to the other end of the second transverse groove 322 and is continuous with each other. On the other hand, when one end of the second transverse groove 322 penetrates to the second main groove 22, one end of the second cut groove pattern 321 penetrates to the first main groove 21, and the other end penetrates to the other end of the second transverse groove 322 and is continuous with each other.

[0047] In addition, a plurality of groups of the second transverse grooves 322 and the second cut groove patterns 321 formed continuously with each other are arranged in the tire circumferential direction. And, the groups of the second transverse grooves 322 and the second cut groove patterns 321 adjacent to each other in the tire circumferential direction are arranged in a staggered manner in the tire circumferential direction. That is, with respect to the group of the second transverse groove 322 that penetrates to the first main groove 21 and the second cut groove pattern 321 that penetrates to the second main groove 22, in other adjacent groups in the tire circumferential direction, the second transverse groove 322 penetrates to the second main groove 22, and the second cut groove pattern 321 penetrates to the first main groove 21. Thus, in the groups of the second transverse grooves 322 and the second cut groove patterns 321 formed continuously with each other, the adjacent groups in the tire circumferential direction alternate in the tire width direction and are arranged in a staggered manner in the tire circumferential direction.

[0048] In addition, in the group of the second transverse groove 322 and the second siped 321 adjacent to each other in the tire circumferential direction, the second transverse groove 322 penetrates through the tire circumferential direction relative to the second siped 321. And, in the group of the second transverse groove 322 and the second siped 321 adjacent to each other in the tire circumferential direction, the biases of the second transverse groove 322 are arranged in a staggered manner in the tire circumferential direction. That is, in the group of the second transverse groove 322 and the second siped 321 arranged on the one side in the tire circumferential direction where the second transverse groove 322 biases towards the second siped 321, in other groups adjacent to each other in the tire circumferential direction, the second transverse groove 322 is arranged on the other side in the tire circumferential direction where the second transverse groove 322 biases towards the second siped 321. Thus, in the group of the second transverse groove 322 and the second siped 321 formed continuously with each other, the biases of the second transverse groove 322 in the groups adjacent to each other in the tire circumferential direction alternate and are arranged in a staggered manner in the tire circumferential direction.

[0049] In addition, in the pneumatic tire 1 of the embodiment, the second circumferential land portion 32 may be uniquely formed with the second siped 321 without the second transverse groove 322. In this case, as Figure 2 shown, one end of the second siped 321 penetrates through to the first main groove 21, and the other end penetrates through to the second main groove 22. That is, in the pneumatic tire 1 of the embodiment, when the second siped 321 does not have the second transverse groove 322, the tire width direction length L1 is 100 [%] with respect to the width B2 of the second circumferential land portion 32 (refer to Figure 2 and Figure 3 ). In addition, in the pneumatic tire 1 of the embodiment, when there is the second transverse groove 322, in terms of obtaining the effects of the present invention, it is preferable that the tire width direction length L2 of the second transverse groove 322 is 45 [%] or less with respect to the width B2 of the second circumferential land portion 32 (refer to Figure 3 ).

[0050] As Figure 2 and Figure 4 shown, the third siped 331 of the third circumferential land portion 33 is formed to extend in the tire width direction. A plurality of the third sipeds 331 are arranged in the tire circumferential direction. According to the change in the pitch, the pitch of the third siped 331 in the tire circumferential direction can be unequal intervals. In terms of obtaining the effects of the present invention, it is preferable that the third siped 331 is formed in a three-dimensional shape like the siped 101 as Figure 5 and Figure 6 shown. The three-dimensional shape of the siped 101 shown in Figure 5 is applied to the third siped 331 of the embodiment. As Figure 4As shown, the third transverse groove 332 of the third circumferential rib portion 33 is formed by extending in the tire width direction. A plurality of the third transverse grooves 332 are arranged in the tire circumferential direction. Depending on the pitch variation, the pitch of the third transverse grooves 332 in the tire circumferential direction can be uneven. The third circumferential rib portion 33 is formed only by the third sipes 331 and the third transverse grooves 332.

[0051] As Figure 4 shown, these third transverse grooves 332 and the third sipes 331 are formed continuously with each other. Specifically, one end of the third transverse groove 332 penetrates through to the second main groove 22, and the other end terminates within the third circumferential rib portion 33. And, one end of the third sipe 331 penetrates through to the other end of the third transverse groove 332, and the other end terminates within the third circumferential rib portion 33. That is, in the group of the third transverse grooves 332 and the third sipes 331 formed continuously with each other, the third transverse groove 332 penetrates through to the second main groove 22, and the third sipe 331 that penetrates through to the third transverse groove 332 terminates within the third circumferential rib portion 33. And, a plurality of groups of the third transverse grooves 332 and the third sipes 331 formed continuously with each other are arranged in the tire circumferential direction. Additionally, in the group of the third transverse grooves 332 and the third sipes 331 formed continuously with each other, the circumferential groove widths W1, W2 expand from the other end through which the third sipe 331 penetrates to the one end that penetrates through to the second main groove 22, thereby forming the third transverse groove 332. In terms of obtaining the effects of the present invention, it is preferable that W1 / W2 of the circumferential groove widths W1, W2 is 5 [%] or more and 30 [%] or less.

[0052] In addition, in the pneumatic tire 1 of the embodiment, the third circumferential rib portion 33 may be formed only with the third sipes 331 without the third transverse grooves 332. In this case, as Figure 2 shown, the third sipe 331 includes a structure with both ends terminating within the third circumferential rib portion 33 and a structure with one end penetrating through to the second main groove 22 and the other end terminating within the third circumferential rib portion 33. Additionally, when the third sipe 331 has the third transverse groove 332, one end penetrates through to the other end of the third transverse groove 332 and penetrates through to the second main groove 22 via the third transverse groove 332, and the other end terminates within the third circumferential rib portion 33. In addition, in the pneumatic tire 1 of the embodiment, in terms of obtaining the effects of the present invention, it is preferable that the tire width direction length L3 of the third sipe 331 alone or including the third transverse groove 332 is 70 [%] or less with respect to the width B3 of the third circumferential rib portion 33 (refer to Figure 4 ). In addition, in the pneumatic tire 1 of the embodiment, in terms of obtaining the effects of the present invention, it is preferable that the tire width direction length L4 of the third transverse groove 332 is 40 [%] or less with respect to the width B3 of the third circumferential rib portion 33 (refer to Figure 4 ).

[0053] As Figure 2 and Figure 4 shown, the fourth knife groove pattern 341 of the fourth circumferential land portion 34 is formed by extending in the tire width direction. A plurality of the fourth knife groove patterns 341 are arranged in the tire circumferential direction. According to the change in the pitch, the pitch of the fourth knife groove pattern 341 in the tire circumferential direction can be unequal intervals. As Figure 4 shown, the fourth transverse groove 342 of the fourth circumferential land portion 34 is formed by extending in the tire width direction. A plurality of the fourth transverse grooves 342 are arranged in the tire circumferential direction. According to the change in the pitch, the pitch of the fourth transverse groove 342 in the tire circumferential direction can be unequal intervals. The fourth circumferential land portion 34 is formed only by the fourth knife groove pattern 341 and the fourth transverse groove 342.

[0054] As Figure 4 shown, these fourth transverse grooves 342 and the fourth knife groove patterns 341 are formed continuously with each other. Specifically, one end of the fourth transverse groove 342 penetrates through to the third main groove 23, and the other end terminates within the fourth circumferential land portion 34. And, one end of the fourth knife groove pattern 341 penetrates through the other end of the fourth transverse groove 342, and the other end terminates within the fourth circumferential land portion 34. That is, in the group of the fourth transverse groove 342 and the fourth knife groove pattern 341 formed continuously with each other, the fourth transverse groove 342 penetrates through to the third main groove 23, and the fourth knife groove pattern 341 penetrating through to the fourth transverse groove 342 terminates within the fourth circumferential land portion 34. And, a plurality of groups of the fourth transverse groove 342 and the fourth knife groove pattern 341 formed continuously with each other are arranged in the tire circumferential direction. In addition, in the group of the fourth transverse groove 342 and the fourth knife groove pattern 341 formed continuously with each other, from the other end through which the fourth knife groove pattern 341 penetrates to one end penetrating through to the third main groove 23, the circumferential groove widths W3, W4 expand, thereby forming the fourth transverse groove 342. In terms of obtaining the effects of the present invention, it is preferable that W3 / W4 of the circumferential groove widths W3, W4 is 5 [%] or more and 30 [%] or less.

[0055] In addition, in the pneumatic tire 1 of the embodiment, the fourth circumferential land portion 34 may be uniquely formed with the fourth knife groove pattern 341 without the fourth transverse groove 342. In this case, as Figure 2 shown, the fourth knife groove pattern 341 includes a structure with both ends terminating within the fourth circumferential land portion 34 and a structure with one end penetrating through to the third main groove 23 and the other end terminating within the fourth circumferential land portion 34. In addition, when the fourth knife groove pattern 341 has the fourth transverse groove 342, one end penetrates through to the other end of the fourth transverse groove 342 and penetrates through to the third main groove 23 via the fourth transverse groove 342, and the other end terminates within the fourth circumferential land portion 34. In addition, in the pneumatic tire 1 of the embodiment, in terms of obtaining the effects of the present invention, it is preferable that the tire width direction length L5 of the fourth knife groove pattern 341 that is unique or includes the fourth transverse groove 342 is 70 [%] or less with respect to the width B4 of the fourth circumferential land portion 34 (refer toFigure 4 ). In addition, in the pneumatic tire 1 of the embodiment, in order to obtain the effect of the present invention, the fourth lug groove 342 preferably has a tire width direction length L6 of 40% or less relative to the width B4 of the fourth land portion 34 (see Figure 4 ).

[0056] like Figure 2 As shown, the thin groove 351 of the fifth land portion 35 is extended in the tire circumferential direction outside the fourth main groove 24 in the tire width direction. The thin groove 351 is formed to have a groove width narrower than the fourth main groove 24. Specifically, in terms of obtaining the effect of the present invention, the thin groove 351 is preferably formed to be 20% or less relative to the groove width of the fourth main groove 24. At least one thin groove 351 is provided in the tire width direction. In the case where there are multiple thin grooves 351, in order to suppress the generation of noise, it is preferably about two.

[0057] like Figure 2 As shown, the fifth sipe 352 of the fifth land portion 35 is formed by penetrating the thin groove 351 at one end and extending outward in the tire width direction at the other end. One end of the fifth sipe 352 becomes a junction point that does not penetrate the thin groove 351. That is, the fifth sipe 352 is arranged at a position staggered in the tire circumferential direction so as to avoid the fifth sipe 352 existing opposite to each other on the extended line when there is a penetrating sipe or groove on the inner side of the thin groove 351 in the tire width direction at the position penetrating the thin groove 351. A plurality of fifth sipes 352 are arranged in the tire circumferential direction. The pitch of the fifth sipe 352 in the tire circumferential direction may be unequally spaced according to the change in pitch. The fifth sipe 352 is uniquely formed on the outer side of the thin groove 351 of the fifth land portion 35 in the tire width direction, and no groove is formed on the outer side of the thin groove 351 in the tire width direction. It is called a sipe tone.

[0058] In terms of obtaining the effects of the present invention, the fifth sipe 352 is preferably as follows: Figure 5 and Figure 6 The fifth sipe 352 of the embodiment is formed into a three-dimensional shape like the sipe 101 shown. Figure 6 The three-dimensional shape of the sipe 101 is shown.

[0059] like Figure 2 As shown, the fifth lug groove 353 of the fifth land portion 35 is formed by penetrating the fourth main groove 24 at one end of the fifth land portion 35 and terminating in the fifth land portion 35 at the other end, and extending in the tire width direction. A plurality of fifth lug grooves 353 are arranged in the tire circumferential direction. According to the change in spacing, the spacing of the fifth lug grooves 353 in the tire circumferential direction can be unequally spaced.

[0060] In the pneumatic tire 1 of the embodiment, in terms of obtaining the effects of the present invention,Figures 2 to 4 As shown, the second sipes 321, second transverse grooves 322, third sipes 331, third transverse grooves 332, fourth sipes 341, and fourth transverse grooves 342 provided in the second circumferential land portion 32, third circumferential land portion 33, and fourth circumferential land portion 34, which are the central circumferential land portions, are preferably inclined in the same direction with respect to the tire width direction. Further, in the pneumatic tire 1 of the embodiment, as Figure 2 shown, the first sipes 311, fifth sipes 352, and fifth transverse grooves 353 provided in the first circumferential land portion 31 and the fifth circumferential land portion 35, which are the shoulder circumferential land portions, have the same inclination as the second sipes 321, second transverse grooves 322, third sipes 331, third transverse grooves 332, fourth sipes 341, and fourth transverse grooves 342.

[0061] As described above, the pneumatic tire 1 of the embodiment is specified to have an orientation with respect to the vehicle width direction when mounted on a vehicle, and has a tread pattern 15b that is asymmetric in the tire width direction with the tire equatorial plane CL as a boundary on the tread 15a. Further, the tread pattern 15b includes: first main grooves 21, second main grooves 22, third main grooves 23, and fourth main grooves 24, which extend in the tire circumferential direction and are provided in four in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction, and at least the outermost groove width in the vehicle width direction is formed narrower than the innermost side in the vehicle width direction; first land portions 31, second land portions 32, third land portions 33, fourth land portions 34, and fifth land portions 35, which are divided by the respective main grooves 21, 22, 23, 24, extend in a rib shape in the tire circumferential direction, and are provided in five in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction; fine grooves 351, which extend in the tire circumferential direction in the fifth land portion 35 and are provided in at least one in the tire width direction, and the groove width is narrower than that of the fourth main groove 24; first sipes 311, one end of which penetrates to the first main groove 21 but does not penetrate in the first land portion 31, and the other end extends to the outer side in the tire width direction, and a plurality of them are provided in the tire circumferential direction, and they are the only ones in the first land portion 31; second sipes 321, which extend in the tire width direction in the second land portion 32 and a plurality of them are provided in the tire circumferential direction; third sipes 331, which extend in the tire width direction in the third land portion 33 and a plurality of them are provided in the tire circumferential direction; fourth sipes 341, which extend in the tire width direction in the fourth land portion 34 and a plurality of them are provided in the tire circumferential direction; fifth sipes 352, one end of which penetrates to the fine groove 351 but does not penetrate in the fifth land portion 35, and the other end extends to the outer side in the tire width direction, and a plurality of them are provided in the tire circumferential direction, and they are the only ones on the outer side in the tire width direction of the fine groove 351; fifth transverse grooves 353, one end of which penetrates to the fourth main groove 24 in the fifth land portion 35, and the other end extends to the outer side in the tire width direction and terminates without penetrating to the fine groove 351, and a plurality of them are provided in the tire circumferential direction. Further, the number of the second sipes 321 is more than twice that of the third sipes 331 and the fourth sipes 341, and the sipes 321, 331, 341 and grooves (322, 332, 342) provided in the second land portion 32, the third land portion 33, and the fourth land portion 34 are inclined in the same direction with respect to the tire width direction, and the first sipes 311, the fifth sipes 352, and the fifth transverse grooves 353 have the same inclination as the sipes 321, 331, 341 and grooves (322, 332, 342) provided in the second land portion 32, the third land portion 33, and the fourth land portion 34.

[0062] According to the pneumatic tire 1, in the said structure, drainage performance is ensured on the inner side in the vehicle width direction to obtain high wet grip performance, and pitch noise is reduced on the outer side in the vehicle width direction to obtain noise performance. Specifically, according to the pneumatic tire 1, mainly, since the groove width of the first main groove 21 is wider on the inner side in the vehicle width direction and the groove width of the fourth main groove 24 is narrower on the outer side in the vehicle width direction, drainage performance and pitch noise reduction are balanced. Since the number of the second sipes 321 in the second land portion 32 is larger than that in the third land portion 33 and the fourth land portion 34, drainage performance and pitch noise reduction are balanced. Fine grooves 351 are formed in the fifth land portion 35 on the outer side in the vehicle width direction. Although the groove width of the fourth main groove 24 is reduced, the groove volume is compensated, thereby compensating the drainage performance on the outer side in the vehicle width direction. Since the fifth transverse groove 353 does not penetrate through to the fine grooves 351, pitch noise is reduced. Since the first sipes 311 and the fifth sipes 352 are made into non-penetrating structures and the circumferential positional relationship with other sipes is staggered, pitch noise is reduced. In addition, since the directions of the inclination angles of the sipes or the transverse grooves are made the same, drainage performance is improved.

[0063] In addition, in the pneumatic tire 1 of the embodiment, the second land portion 32 includes a second transverse groove 322 having one end penetrating through to the first main groove 21 or the second main groove 22 and the other end terminating within the second land portion 32, and one end of the second sipes 321 penetrates through to the second main groove 22 or the first main groove 21 and the other end penetrates through to the other end of the second transverse groove 322.

[0064] According to the pneumatic tire 1, in the second land portion 32 near the inner side in the vehicle width direction, by ensuring the groove volume on the inner side in the vehicle width direction within the necessary minimum range, wet grip performance and noise performance can be balanced.

[0065] In addition, in the pneumatic tire 1 of the embodiment, the mutually continuous second transverse groove 322 and the second sipes 321 are arranged in a staggered manner along the tire circumferential direction.

[0066] According to the pneumatic tire 1, it is possible to suppress the drainage difference caused when the rotation direction is reversed under low tire tension in the asymmetric tread pattern 15b and improve the wet grip performance.

[0067] In addition, in the pneumatic tire 1 of the embodiment, the second transverse groove 322 penetrates through with a bias relative to the second sipes 321 in the tire circumferential direction, and the bias is arranged in a staggered manner along the tire circumferential direction.

[0068] According to the pneumatic tire 1, by dispersing the period in the tire circumferential direction, pitch noise can be reduced and noise performance can be improved.

[0069] In addition, in the pneumatic tire 1 of the embodiment, one end of the third siped 331 penetrates through to the second main groove 22, and the other end terminates within the third land 33. One end of the fourth siped 341 penetrates through to the third main groove 23, and the other end terminates within the fourth land 34.

[0070] According to this pneumatic tire 1, by preventing the absorption and leakage of sound, the noise performance can be improved.

[0071] In addition, the pneumatic tire 1 of the embodiment includes: a third transverse groove 332 that penetrates through to the second main groove 22 at one end within the third land 33 and terminates within the third land 33 at the other end; a fourth transverse groove 342 that penetrates through to the third main groove 23 at one end within the fourth land 34 and terminates within the fourth land 34 at the other end; one end of the third siped 331 penetrates through to the other end of the third transverse groove 332 and penetrates through to the second main groove 22 via the third transverse groove 332, and one end of the fourth siped 341 penetrates through to the other end of the fourth transverse groove 342 and penetrates through to the third main groove 23 via the fourth transverse groove 342.

[0072] According to this pneumatic tire 1, by ensuring the groove volume within the necessary minimum range, both the wet grip performance and the noise performance can be taken into account.

[0073] In addition, in the pneumatic tire 1 of the embodiment, the circumferential groove width expands from the other end to one end to form the third transverse groove 332, and the circumferential groove width expands from the other end to one end to form the fourth transverse groove 342.

[0074] According to this pneumatic tire 1, by further ensuring the groove volume within the necessary minimum range, both the wet grip performance and the noise performance can be taken into account.

[0075] In addition, in the pneumatic tire 1 of the embodiment, the third siped 331 has a three-dimensional shape.

[0076] According to this pneumatic tire 1, it is possible to achieve both suppressing the uneven wear of the third land 33 on the inner side in the tire width direction by ensuring rigidity and ensuring drainage performance.

[0077] In addition, in the pneumatic tire 1 of the embodiment, the first siped 311 and the fifth siped 352 have three-dimensional shapes.

[0078] According to this pneumatic tire 1, it is possible to prevent the first land 31 and the fifth land 35 on the outer side in the tire width direction from tipping, prevent the heel-to-toe wear in the tire circumferential direction between the sipeds, thereby reducing the pitch noise and improving the noise performance.

[0079] In the present embodiment, as described above, a pneumatic tire has been described in the form of an example of a tire. However, the example is not limited thereto, and the structure described in the present embodiment can also be arbitrarily applied to other tires within the range obvious to those skilled in the art. As other tires, for example, a non-pneumatic tire can be cited.

[0080] Example

[0081] Figure 7 And Figure 8 is a chart showing the performance test results of the pneumatic tire of the embodiment. Hereinafter, performance evaluation tests of the pneumatic tire of the conventional example, the pneumatic tire of the comparative example, and the pneumatic tire of the example of the embodiment will be described. The performance evaluation test is a test regarding noise performance and wet grip performance.

[0082] For the evaluation test of the noise performance, a pneumatic tire with a tire size of 235 / 50R18 97W was assembled onto a standard rim of the JATMA standard with a rim size of 18×7.5J and installed on a 2WD minivan as a test vehicle. The applied air pressure was 230 kPa at the front and 240 kPa at the rear. And, in the evaluation test, the test vehicle was driven by a test driver on a test track, and the noise energy in the driver's seat ear was measured and indexed. This evaluation was performed by index evaluation based on the conventional example (100), and the larger the reciprocal of the value, the better the noise performance.

[0083] For the evaluation test of the wet grip performance, a pneumatic tire with a tire size of 235 / 50R18 97W was assembled onto a standard rim of the JATMA standard with a rim size of 18×7.5J and installed on a 2WD minivan as a test vehicle. The applied air pressure was 220 kPa both at the front and the rear. And, in the evaluation test, the test vehicle was driven by a test driver on a test track of the R711 reference road surface, and the wet grip performance was measured and indexed based on the μ-s characteristics. This evaluation was performed by index evaluation based on the conventional example (100), and the larger the value, the better the noise performance.

[0084] All four main grooves of the pneumatic tire in the conventional example have the same groove width, do not have fine grooves, the ratio of the second knife groove pattern to the third knife groove pattern and the fourth knife groove pattern is the same, the first knife groove pattern penetrates the groove, and the fifth transverse groove is continuous and communicates with the fifth knife groove pattern.

[0085] In the pneumatic tire of Example 1, the first main groove among the four main grooves has the widest groove width, the second and third main grooves have the same groove width and are narrower than the first main groove, the fourth main groove has the narrowest groove width, there are fine grooves with a groove width narrower than that of the fourth main groove, the ratio of the second siped pattern to the third and fourth siped patterns is 2 times, the first and fifth siped patterns are through grooves but do not penetrate, and the fifth transverse groove is only provided to penetrate up to the fourth main groove. In addition, other characteristics of the pneumatic tires in Examples 2 to 15 are specified.

[0086] Some of the provisions for the pneumatic tires in Comparative Examples 1 to 4 are different from those of the pneumatic tire in Example 1.

[0087] Moreover, as shown by the test results, it can be seen that the pneumatic tire in this example has improved noise performance and wet grip performance compared to the conventional example.

[0088] The present invention includes the following inventions.

[0089] [Invention 1]

[0090] A tire

[0091] which is a tire specified to have an orientation with respect to the vehicle width direction when mounted on a vehicle and having an asymmetric tread pattern with the tire equatorial plane as a boundary on the tread

[0092] The tread pattern includes:

[0093] First, second, third, and fourth main grooves that extend in the tire circumferential direction and are provided with four in the tire width direction from the inner side to the outer side of the vehicle width direction, and at least the groove width of the outermost side in the vehicle width direction is formed to be narrower than that of the innermost side in the vehicle width direction;

[0094] First, second, third, fourth, and fifth rib portions that are divided by each of the main grooves, extend in a rib shape in the tire circumferential direction, and are provided with five in the tire width direction from the inner side to the outer side of the vehicle width direction;

[0095] Fine grooves that extend in the tire circumferential direction in the fifth rib portion and are provided with at least one in the tire width direction, and the groove width is narrower than that of the fourth main groove;

[0096] A first siped pattern that penetrates to the first main groove at one end but does not penetrate in the first rib portion, extends to the outer side in the tire width direction at the other end, is provided with a plurality in the tire circumferential direction, and is the only one in the first rib portion;

[0097] A second siped pattern that extends in the tire width direction in the second rib portion and is provided with a plurality in the tire circumferential direction;

[0098] The third knife groove pattern, which extends in the tire width direction on the third annular shore portion and is provided with a plurality of them in the tire circumferential direction;

[0099] The fourth knife groove pattern, which extends in the tire width direction on the fourth annular shore portion and is provided with a plurality of them in the tire circumferential direction;

[0100] The fifth knife groove pattern, one end of which penetrates through to the fine groove but does not penetrate in the fifth annular shore portion, and the other end extends outward in the tire width direction, and a plurality of them are provided in the tire circumferential direction, and it is the only one on the outer side of the fine groove in the tire width direction;

[0101] The fifth transverse groove, one end of which penetrates through to the fourth main groove in the fifth annular shore portion, and the other end extends outward in the tire width direction and terminates without penetrating through to the fine groove, and a plurality of them are provided in the tire circumferential direction;

[0102] The number of the second knife groove patterns is more than twice that of the third knife groove pattern and the fourth knife groove pattern,

[0103] The knife groove patterns or grooves provided on the second annular shore portion, the third annular shore portion, and the fourth annular shore portion are arranged to be inclined in the same direction with respect to the tire width direction,

[0104] The first knife groove pattern, the fifth knife groove pattern, and the fifth transverse groove have the same inclination as the knife groove patterns or the grooves provided on the second annular shore portion, the third annular shore portion, and the fourth annular shore portion.

[0105] [Invention 2]

[0106] The tire according to Invention 1, wherein

[0107] The second annular shore portion includes a second transverse groove, one end of which penetrates through to the first main groove or the second main groove, and the other end terminates within the second annular shore portion;

[0108] One end of the second knife groove pattern penetrates through to the second main groove or the first main groove, and the other end penetrates through to the other end of the second transverse groove.

[0109] [Invention 3]

[0110] The tire according to Invention 2, wherein

[0111] The second transverse groove and the second knife groove pattern that penetrate through each other are arranged in a staggered manner along the tire circumferential direction.

[0112] [Invention 4]

[0113] The tire according to Invention 3, wherein

[0114] The second transverse groove is more inclined to be continuous relative to the second siped pattern in the circumferential direction of the tire, and the inclination is arranged in a staggered manner in the circumferential direction of the tire.

[0115] [Invention 5]

[0116] For a tire according to any one of Inventions 1 to 4, wherein

[0117] One end of the third siped pattern penetrates through to the second main groove, and the other end terminates within the third circumferential rib.

[0118] One end of the fourth siped pattern penetrates through to the third main groove, and the other end terminates within the fourth circumferential rib.

[0119] [Invention 6]

[0120] For a tire according to Invention 5,

[0121] It includes:

[0122] A third transverse groove, one end of which penetrates through to the second main groove in the third circumferential rib and the other end terminates within the third circumferential rib;

[0123] A fourth transverse groove, one end of which penetrates through to the third main groove in the fourth circumferential rib and the other end terminates within the fourth circumferential rib;

[0124] One end of the third siped pattern penetrates through to the other end of the third transverse groove and penetrates through to the second main groove via the third transverse groove,

[0125] One end of the fourth siped pattern penetrates through to the other end of the fourth transverse groove and penetrates through to the third main groove via the fourth transverse groove.

[0126] [Invention 7]

[0127] For a tire according to Invention 6, wherein

[0128] The circumferential groove width expands from the other end to one end to form the third transverse groove,

[0129] The circumferential groove width expands from the other end to one end to form the fourth transverse groove.

[0130] [Invention 8]

[0131] For a tire according to any one of Inventions 1 to 7, wherein the third siped pattern has a three-dimensional shape.

[0132] [Invention 9]

[0133] For a tire according to any one of Inventions 1 to 8, wherein the first siped pattern and the fifth siped pattern have three-dimensional shapes.

[0134] Explanation of Reference Numerals

[0135] 1: Pneumatic tire (tire)

[0136] 15b: Tread pattern

[0137] 15a: Tread

[0138] 21: First main groove

[0139] 22: Second main groove

[0140] 23: Third main groove

[0141] 24: Fourth main groove

[0142] 31: First land portion

[0143] 32: Second land portion

[0144] 33: Third land portion

[0145] 34: Fourth land portion

[0146] 35: Fifth land portion

[0147] 311: First siped pattern

[0148] 321: Second siped pattern

[0149] 322: Second transverse groove

[0150] 331: Third siped pattern

[0151] 332: Third transverse groove

[0152] 341: Fourth siped pattern

[0153] 342: Fourth transverse groove

[0154] 351: Fine groove

[0155] 352: Fifth siped pattern

[0156] 353: Fifth transverse groove

Claims

1. A tire, which is a tire specified to have an orientation with respect to the vehicle width direction when mounted on a vehicle and has an asymmetric tread pattern with the tire equatorial plane as a boundary on the tread surface, The tread pattern includes: First, second, third, and fourth main grooves, which extend circumferentially of the tire and are provided with four in number from the inner side in the vehicle width direction to the outer side in the vehicle width direction in the tire width direction, and at least the groove width of the outermost groove in the vehicle width direction is formed to be narrower than that of the innermost groove in the vehicle width direction; First, second, third, fourth, and fifth land portions, which are delimited by each of the main grooves and extend in a rib shape circumferentially of the tire, and are provided with five in number in the tire width direction from the inner side in the vehicle width direction to the outer side in the vehicle width direction; Fine grooves, which extend circumferentially of the tire in the fifth land portion and are provided with at least one in the tire width direction, and the groove width is narrower than that of the fourth main groove; First sipes, one end of which penetrates through to the first main groove but does not penetrate in the first land portion, and the other end extends to the outer side in the tire width direction, and a plurality of them are provided in the circumferential direction of the tire, and they are the only ones in the first land portion; Second sipes, which extend in the tire width direction in the second land portion and are provided with a plurality of them in the circumferential direction of the tire; Third sipes, which extend in the tire width direction in the third land portion and are provided with a plurality of them in the circumferential direction of the tire; Fourth sipes, which extend in the tire width direction in the fourth land portion and are provided with a plurality of them in the circumferential direction of the tire; Fifth sipes, one end of which penetrates through to the fine groove but does not penetrate in the fifth land portion, and the other end extends to the outer side in the tire width direction, and a plurality of them are provided in the circumferential direction of the tire, and they are the only ones on the outer side in the tire width direction of the fine groove; Fifth transverse grooves, one end of which penetrates through to the fourth main groove in the fifth land portion, and the other end extends to the outer side in the tire width direction and terminates without penetrating through to the fine groove, and a plurality of them are provided in the circumferential direction of the tire; The number of the second sipes is more than twice that of the third sipes and the fourth sipes, The sipes or grooves provided in the second land portion, the third land portion, and the fourth land portion are provided to be inclined in the same direction with respect to the tire width direction, The first sipes, the fifth sipes, and the fifth transverse grooves have the same inclination as the sipes or the grooves provided in the second land portion, the third land portion, and the fourth land portion.

2. The tire according to claim 1, wherein the second circumferential rib portion includes a second transverse groove, one end of which penetrates to the first main groove or the second main groove, and the other end terminates within the second circumferential rib portion; one end of the second siped pattern penetrates to the second main groove or the first main groove, and the other end penetrates to the other end of the second transverse groove.

3. The tire according to claim 2, wherein the second transverse groove and the second siped pattern that communicate with each other are arranged in a staggered manner along the tire circumferential direction.

4. The tire according to claim 3, wherein the second transverse groove is biased in the tire circumferential direction with respect to the second siped pattern, and the bias is arranged in a staggered manner along the tire circumferential direction.

5. The tire according to claim 1, wherein one end of the third siped pattern penetrates to the second main groove, and the other end terminates within the third circumferential rib portion, one end of the fourth siped pattern penetrates to the third main groove, and the other end terminates within the fourth circumferential rib portion.

6. The tire according to claim 5, which includes: Third transverse grooves, one end of which penetrates through to the second main groove in the third land portion, and the other end terminates within the third land portion; Fourth transverse grooves, one end of which penetrates through to the third main groove in the fourth land portion, and the other end terminates within the fourth land portion; One end of the third sipes penetrates through to the other end of the third transverse grooves and penetrates through to the second main groove via the third transverse grooves, One end of the fourth sipes penetrates through to the other end of the fourth transverse grooves and penetrates through to the third main groove via the fourth transverse grooves.

7. The tire according to claim 6, wherein the circumferential groove width expands from one end to the other end to form the third transverse groove, the circumferential groove width expands from one end to the other end to form the fourth transverse groove.

8. The tire according to claim 1, wherein the third siped has a three-dimensional shape.

9. The tire according to claim 1, wherein the first siped and the fifth siped have a three-dimensional shape.

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