JP2014118053A - Pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration of steering stability to improve while improving the performances of drainage and riding comfort.SOLUTION: A pneumatic tire 1 comprises a plurality of land parts 23A by specifying a mounting direction to the inside and outside of a vehicle when being mounted to the vehicle and by forming a plurality of main grooves 22 on a tread surface. Plural recesses 10 are provided along the extending direction of the main grooves 22 on at least one of the sidewall 23a directing to the tire width direction of at least one land part 23A. The volume of the recess 10 is large as the recess is provided on the sidewall 23a near the innermost side of the vehicle, and that of the recess 10 is small as the recess is provided on the sidewall 23a near the outermost side of the vehicle.

Description

  The present invention relates to a pneumatic tire. More specifically, the present invention relates to a pneumatic tire that improves deterioration of steering stability performance while improving drainage performance and riding comfort performance.

  Conventionally, for example, Patent Literature 1 to Patent Literature 3 show a pneumatic tire that improves drainage performance (or snow drainage performance) by providing a recess in a groove wall of a groove formed on a tread surface. Conventionally, Patent Document 4 discloses a pneumatic tire that includes a block by a groove formed on a tread surface, and changes the cross-sectional area of a recess formed on a side wall of the block to suppress heel and toe wear. . Conventionally, Patent Document 5 discloses an air that suppresses uneven wear caused by uneven contact pressure by reducing the volume of the recess formed in the middle of the groove wall as the distance from the corner intersecting the groove increases. An inset tire is shown.

Japanese Patent Laid-Open No. 11-32238 JP-A-2005-324685 JP 2006-137239 A JP 2004-98943 A JP 2005-193702 A

  Like the pneumatic tire described in the above-mentioned patent document, drainage performance is improved by forming a recess in the groove wall (side wall of the block), and uneven wear is improved by appropriately changing the cross-sectional area (volume) of the recess. It is known that On the other hand, pneumatic tires are desired to improve ride comfort. In addition, when a recess is formed in the groove wall (side wall of the block) as in the pneumatic tire described in the patent document, the block rigidity is lowered, and thus the steering stability performance during turning tends to deteriorate.

  This invention is made in view of the above, Comprising: It aims at providing the pneumatic tire which can improve deterioration of steering stability performance, improving drainage performance and riding comfort performance.

  In order to solve the above-described problems and achieve the object, the pneumatic tire according to the first aspect of the present invention is specified by the orientation of the inside and outside of the vehicle when the vehicle is mounted, and a plurality of grooves are formed on the tread surface. In the pneumatic tire including the land portion, at least one of the side walls facing the tire width direction of the at least one land portion arranged in the tire width direction is provided with a plurality of recesses along the extending direction of the groove, The concave portion provided on the side wall near the innermost side of the vehicle has a larger volume, and the concave portion provided on the side wall near the outermost side of the vehicle has a smaller volume.

  According to this pneumatic tire, the groove sectional area of the groove is increased by the recess, so that the drainage performance of the groove is improved. For this reason, drainage performance can be improved. Moreover, the concave portion provided on the side wall closer to the innermost side of the vehicle has a larger volume, and the concave portion provided on the side wall closer to the outermost side of the vehicle has a smaller volume (including 0), thereby providing a land portion on the outer side of the vehicle provided with the concave portion. The rigidity of the land portion inside the vehicle is lower than the rigidity of the vehicle. The land portion on the inner side of the vehicle is highly loaded and contributes to ride comfort when traveling straight ahead. For this reason, the ride comfort performance can be improved because the load is received by the land portion inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion is provided on the side wall of the land portion, the rigidity of the land portion is lowered, so that the steering stability performance at the time of turning tends to deteriorate. In this regard, according to this pneumatic tire, the concave portion provided on the side wall near the vehicle innermost side has a larger volume, and the concave portion provided on the side wall closer to the outermost vehicle side has a smaller volume (including 0). The rigidity of the land portion outside the vehicle is higher than the rigidity of the land portion inside the vehicle provided with the recess. The land portion outside the vehicle is more loaded than the inside of the vehicle when turning the vehicle, and contributes to the steering stability performance. For this reason, since the load is received by the land portion outside the vehicle having high rigidity when the vehicle turns, deterioration of the steering stability performance can be suppressed.

  Further, the pneumatic tire of the second invention is the pneumatic tire according to the first invention, wherein the land portion extends along the tire circumferential direction and is arranged in the tire width direction, and the lug groove intersecting the main groove. And a plurality of the recesses are provided along the extending direction of the main groove with respect to at least one of the side walls facing the tire width direction of at least one of the land portions arranged in the tire width direction. The concave portion provided on the side wall near the innermost side of the vehicle has a larger total volume, and the concave portion provided on the side wall near the outermost side of the vehicle has a smaller total volume.

  According to this pneumatic tire, since the groove cross-sectional area of the main groove is increased by the recess, the drainage of the main groove is improved. For this reason, drainage performance can be improved. Moreover, the concave portion provided on the side wall closer to the innermost side of the vehicle has a larger volume, and the concave portion provided on the side wall closer to the outermost side of the vehicle has a smaller volume (including 0), thereby providing a land portion on the outer side of the vehicle provided with the concave portion. The rigidity of the land portion inside the vehicle is lower than the rigidity of the vehicle. The land portion on the inner side of the vehicle is highly loaded and contributes to ride comfort when traveling straight ahead. For this reason, the ride comfort performance can be improved because the load is received by the land portion inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion is provided on the side wall of the land portion, the rigidity of the land portion is lowered, so that the steering stability performance at the time of turning tends to deteriorate. In this regard, according to this pneumatic tire, the concave portion provided on the side wall near the vehicle innermost side has a larger volume, and the concave portion provided on the side wall closer to the outermost vehicle side has a smaller volume (including 0). The rigidity of the land portion outside the vehicle is higher than the rigidity of the land portion inside the vehicle provided with the recess. The land portion outside the vehicle is more loaded than the inside of the vehicle when turning the vehicle, and contributes to the steering stability performance. For this reason, since the load is received by the land portion outside the vehicle having high rigidity when the vehicle turns, deterioration of the steering stability performance can be suppressed.

  The pneumatic tire according to a third aspect of the present invention is the pneumatic tire having a plurality of land portions by designating a direction inside and outside the vehicle when the vehicle is mounted and forming a plurality of grooves on a tread surface. The portion is formed in a block shape by a plurality of main grooves extending in the tire circumferential direction and arranged in the tire width direction, and lug grooves intersecting the main groove, and the recesses are arranged in the tire width direction. A plurality of side walls which are at least one of the land portions and are oriented in the tire circumferential direction of the land portions are provided along the extending direction of the lug grooves, and are provided on the side walls near the innermost side of the vehicle. The concave portion has a larger total volume, and the concave portion provided on the side wall closer to the outermost side of the vehicle has a smaller total volume.

  According to this pneumatic tire, since the groove cross-sectional area of the lug groove is increased by the recess, the drainage performance of the lug groove is improved. For this reason, drainage performance can be improved. Moreover, the concave portion provided on the side wall closer to the innermost side of the vehicle has a larger volume, and the concave portion provided on the side wall closer to the outermost side of the vehicle has a smaller volume (including 0), thereby providing a land portion on the outer side of the vehicle provided with the concave portion. The rigidity of the land portion inside the vehicle is lower than the rigidity of the vehicle. The land portion on the inner side of the vehicle is highly loaded and contributes to ride comfort when traveling straight ahead. For this reason, the ride comfort performance can be improved because the load is received by the land portion inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion is provided on the side wall of the land portion, the rigidity of the land portion is lowered, so that the steering stability performance at the time of turning tends to deteriorate. In this regard, according to this pneumatic tire, the concave portion provided on the side wall near the vehicle innermost side has a larger volume, and the concave portion provided on the side wall closer to the outermost vehicle side has a smaller volume (including 0). The rigidity of the land portion outside the vehicle is higher than the rigidity of the land portion inside the vehicle provided with the recess. The land portion outside the vehicle is more loaded than the inside of the vehicle when turning the vehicle, and contributes to the steering stability performance. For this reason, since the load is received by the land portion outside the vehicle having high rigidity when the vehicle turns, deterioration of the steering stability performance can be suppressed.

  A pneumatic tire according to a fourth aspect of the present invention is the pneumatic tire having a plurality of land portions by designating a direction inside and outside the vehicle when the vehicle is mounted and forming a plurality of grooves on a tread surface. The portion is formed in a block shape by a plurality of main grooves extending in the tire circumferential direction and arranged in the tire width direction, and lug grooves intersecting the main groove, and the recesses are arranged in the tire width direction. For at least two of the plurality of side walls facing the tire width direction of the land portion, a plurality of the recesses provided in the side walls near the innermost side of the vehicle are provided in a plurality along the extending direction of the main groove. And the concave portion provided on the side wall near the outermost vehicle is formed to have a smaller total volume, and the concave portion is at least two of the land portions arranged in the tire width direction. Each facing in the tire circumferential direction A plurality of the concave portions provided on the side wall near the innermost side of the vehicle are provided in a plurality along the extending direction of the lug groove with respect to the wall. The volume is small.

  According to this pneumatic tire, since the groove cross-sectional areas of the main groove and the lug groove are increased by the recess, the drainage of the main groove and the lug groove is improved. For this reason, drainage performance can be improved. Moreover, the concave portion provided on the side wall closer to the innermost side of the vehicle has a larger volume, and the concave portion provided on the side wall closer to the outermost side of the vehicle has a smaller volume (including 0), thereby providing a land portion on the outer side of the vehicle provided with the concave portion. The rigidity of the land portion inside the vehicle is lower than the rigidity of the vehicle. The land portion on the inner side of the vehicle is highly loaded and contributes to ride comfort when traveling straight ahead. For this reason, the ride comfort performance can be improved because the load is received by the land portion inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion is provided on the side wall of the land portion, the rigidity of the land portion is lowered, so that the steering stability performance at the time of turning tends to deteriorate. In this regard, according to this pneumatic tire, the concave portion provided on the side wall near the vehicle innermost side has a larger volume, and the concave portion provided on the side wall closer to the outermost vehicle side has a smaller volume (including 0). The rigidity of the land portion outside the vehicle is higher than the rigidity of the land portion inside the vehicle provided with the recess. The land portion outside the vehicle is more loaded than the inside of the vehicle when turning the vehicle, and contributes to the steering stability performance. For this reason, since the load is received by the land portion outside the vehicle having high rigidity when the vehicle turns, deterioration of the steering stability performance can be suppressed.

  The pneumatic tire according to a fifth aspect of the present invention is the pneumatic tire according to any one of the first, second, and fourth aspects, wherein the concave portion is provided on the concave portion provided on the side wall of the land portion facing the tire width direction. The total volume Vout of the concave portion in the side wall that is the outermost side of the vehicle and the total volume Vin of the concave portion in the side wall that is provided with the concave portion and is the innermost side of the vehicle are 1.5 ≦ Vin / Vout ≦ 80. It is characterized by satisfying the range of

  According to this pneumatic tire, by setting Vin / Vout within the above range, it is possible to maintain the balance of the rigidity difference of the land portion, and to obtain the effect of improving the ride comfort performance and the effect of improving the steering stability performance remarkably. Can do.

  A pneumatic tire according to a sixth aspect of the present invention is the pneumatic tire according to the third or fourth aspect, wherein the concave portion is provided on each side wall of the land portion facing the tire circumferential direction so that the concave portion is provided and the vehicle outermost side is provided. The total volume Vout ′ of the concave portion in the land portion and the total volume Vin ′ of the concave portion in the land portion where the concave portion is provided and located on the innermost side of the vehicle are 1.5 ≦ Vin ′ / Vout ′ ≦ 80. It is characterized by satisfying the range of

  According to this pneumatic tire, by setting Vin ′ / Vout ′ in the above range, the balance of the rigidity difference between the land portions can be maintained, and the effect of improving the riding comfort performance and the effect of improving the steering stability performance are remarkable. Can be obtained.

  The pneumatic tire according to a seventh aspect of the present invention is the first, second, fourth, or fifth aspect, wherein the concave portion provided on the side wall of the land portion facing the tire width direction is In the side wall provided with the recess, the tire circumferential length Ld excluding the recess and the total tire circumferential length Lw satisfy a range of 0.05 ≦ Ld / Lw ≦ 0.70. To do.

  According to this pneumatic tire, by setting Ld / Lw within the above range, it is possible to maintain the balance of the rigidity difference between the land portions, and to obtain a remarkable effect of improving riding comfort performance and improvement of steering stability performance. Can do.

  The pneumatic tire according to an eighth aspect of the present invention is the pneumatic tire according to any one of the third, fourth, and sixth aspects, wherein the concave portion is provided on the concave portion provided on the side wall of the land portion facing the tire circumferential direction. In the side wall, the tire width direction length Ld ′ excluding the concave portion and the total tire width direction length Lw ′ satisfy the range of 0.05 ≦ Ld ′ / Lw ′ ≦ 0.70. And

  According to this pneumatic tire 1, by setting Ld ′ / Lw ′ within the above range, the balance of the rigidity difference between the land portions can be maintained, and the effect of improving the ride comfort performance and the effect of improving the steering stability performance are remarkable. Can get to.

  Moreover, the pneumatic tire of the ninth invention is the invention according to any one of the first to eighth inventions, from the groove bottom of the groove forming the side wall provided with the recess to the center position in the tire radial direction of the recess. The distance D1 and the groove depth D of the groove satisfy a range of 0.10 ≦ D1 / D ≦ 0.60.

  According to this pneumatic tire, when D1 / D is less than 0.10 or exceeds 0.60, since the concave portion is provided near the base of the land portion or near the tip, the effect of causing a difference in rigidity of the land portion is low. On the other hand, when D1 / D is in the range of 0.10 or more and 0.60 or less, since the concave portion is provided near the center of the land portion, an effect of causing a difference in rigidity of the land portion can be remarkably obtained.

  The pneumatic tire according to the present invention can improve deterioration of steering stability performance while improving drainage performance and riding comfort performance.

FIG. 1 is a meridional sectional view of a pneumatic tire according to an embodiment of the present invention. FIG. 2 is a plan view showing a tread portion of the pneumatic tire according to the embodiment of the present invention. FIG. 3 is a perspective view showing a part of the tread portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a part of the tread portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 5 is a perspective view showing a part of the tread portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 6 is a perspective view showing a part of the tread portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 7 is an enlarged perspective view showing a part of the tread portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 8 is an enlarged cross-sectional view showing a concave portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view showing a concave portion of the pneumatic tire according to the first embodiment of the present invention. FIG. 10 is a plan view showing a tread portion of a pneumatic tire according to a modification of the first embodiment of the present invention. FIG. 11 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 2 of the present invention. FIG. 12 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 2 of the present invention. FIG. 13 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 2 of the present invention. FIG. 14 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 2 of the present invention. FIG. 15 is an enlarged perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 2 of the present invention. FIG. 16 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 3 of the present invention. FIG. 17 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 3 of the present invention. FIG. 18 is a perspective view showing a part of a tread portion of a pneumatic tire according to Embodiment 3 of the present invention. FIG. 19 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention. FIG. 20 is a perspective view showing a part of the tread portion of the pneumatic tire of Comparative Example 1 according to the Example of the present invention. FIG. 21 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention. FIG. 22 is a perspective view showing a part of the tread portion of the pneumatic tire of the comparative example 2 according to the embodiment of the present invention. FIG. 23 is a chart showing the results of the performance test of the pneumatic tire according to the example of the present invention. FIG. 24 is a perspective view showing a part of the tread portion of the pneumatic tire of the comparative example 3 according to the embodiment of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. The constituent elements of this embodiment include those that can be easily replaced by those skilled in the art or those that are substantially the same. Further, a plurality of modifications described in this embodiment can be arbitrarily combined within the scope obvious to those skilled in the art.

  FIG. 1 is a meridional sectional view of a pneumatic tire according to this embodiment, and FIG. 2 is a plan view showing a tread portion of the pneumatic tire according to this embodiment.

  In the following description, the tire radial direction refers to a direction orthogonal to the rotation axis (not shown) of the pneumatic tire 1, and the tire radial direction inner side refers to the side toward the rotation axis in the tire radial direction, the tire radial direction outer side. Means the side away from the rotation axis in the tire radial direction. Further, the tire circumferential direction refers to a direction around the rotation axis as a central axis. Further, the tire width direction means a direction parallel to the rotation axis, the inner side in the tire width direction means the side toward the tire equator plane (tire equator line) CL in the tire width direction, and the outer side in the tire width direction means the tire width direction. Is the side away from the tire equatorial plane CL. The tire equatorial plane CL is a plane that is orthogonal to the rotation axis of the pneumatic tire 1 and passes through the center of the tire width of the pneumatic tire 1. The tire width is the width in the tire width direction between the portions located outside in the tire width direction, that is, the distance between the portions farthest from the tire equatorial plane CL in the tire width direction. The tire equator line is a line along the tire circumferential direction of the pneumatic tire 1 on the tire equator plane CL. In the present embodiment, the same sign “CL” as that of the tire equator plane is attached to the tire equator line.

  As shown in FIG. 1, the pneumatic tire 1 according to the present embodiment includes a tread portion 2, shoulder portions 3 on both sides thereof, and a sidewall portion 4 and a bead portion 5 that are sequentially continuous from the shoulder portions 3. Yes. The pneumatic tire 1 includes a carcass layer 6, a belt layer 7, and a belt reinforcing layer 8.

  The tread portion 2 is made of a rubber material (tread rubber), is exposed at the outermost side in the tire radial direction of the pneumatic tire 1, and the surface thereof is the contour of the pneumatic tire 1. A tread surface 21 is formed on the outer peripheral surface of the tread portion 2, that is, on the tread surface that contacts the road surface during traveling. The tread surface 21 is provided with a plurality of (three in the present embodiment) main grooves 22 which are straight main grooves extending along the tire circumferential direction and parallel to the tire equator line CL. The tread surface 21 extends along the tire circumferential direction by the plurality of main grooves 22, and a plurality of rib-like land portions 23 parallel to the tire equator line CL are formed. As shown in FIG. 2, the tread surface 21 is provided with a lug groove 24 that intersects the main groove 22 in each land portion 23. For this reason, a block-shaped land portion 23 </ b> A in which the land portion 23 is divided into a plurality in the tire circumferential direction by the lug grooves 24 is formed. 2 is a schematic view of the tread portion 2. The main groove 22 may be formed to be bent or curved while extending along the tire circumferential direction, and the lug groove 24 may be formed from the tire. It may be formed bent or curved while extending while being inclined with respect to the circumferential direction.

  The shoulder portion 3 is a portion on both outer sides in the tire width direction of the tread portion 2. Further, the sidewall portion 4 is exposed at the outermost side in the tire width direction of the pneumatic tire 1. The bead unit 5 includes a bead core 51 and a bead filler 52. The bead core 51 is formed by winding a bead wire, which is a steel wire, in a ring shape. The bead filler 52 is a rubber material disposed in a space formed by folding the end portion in the tire width direction of the carcass layer 6 at the position of the bead core 51.

  The carcass layer 6 is configured such that each tire width direction end portion is folded back from the tire width direction inner side to the tire width direction outer side by a pair of bead cores 51 and is wound around in a toroidal shape in the tire circumferential direction. It is. The carcass layer 6 is formed by coating a plurality of carcass cords (not shown) arranged in parallel at an angle in the tire circumferential direction with an angle with respect to the tire circumferential direction being along the tire meridian direction. The carcass cord is made of organic fibers (polyester, rayon, nylon, etc.). The carcass layer 6 is provided as at least one layer.

  The belt layer 7 has a multilayer structure in which at least two belts 71 and 72 are laminated, and is disposed on the outer side in the tire radial direction which is the outer periphery of the carcass layer 6 in the tread portion 2 and covers the carcass layer 6 in the tire circumferential direction. It is. The belts 71 and 72 are made by coating a plurality of cords (not shown) arranged in parallel at a predetermined angle (for example, 20 degrees to 30 degrees) with a coat rubber with respect to the tire circumferential direction. The cord is made of steel or organic fiber (polyester, rayon, nylon, etc.). Further, the overlapping belts 71 and 72 are arranged so that the cords intersect each other.

  The belt reinforcing layer 8 is disposed on the outer side in the tire radial direction which is the outer periphery of the belt layer 7 and covers the belt layer 7 in the tire circumferential direction. The belt reinforcing layer 8 is formed by coating a plurality of cords (not shown) arranged substantially parallel (± 5 degrees) in the tire circumferential direction and in the tire width direction with a coat rubber. The cord is made of steel or organic fiber (polyester, rayon, nylon, etc.). The belt reinforcing layer 8 shown in FIG. 1 is disposed so as to cover the end of the belt layer 7 in the tire width direction. The configuration of the belt reinforcing layer 8 is not limited to the above, and is not clearly shown in the figure. However, the belt reinforcing layer 8 is configured to cover the entire belt layer 7 or has two reinforcing layers, for example, on the inner side in the tire radial direction. The reinforcing layer is formed so as to be larger in the tire width direction than the belt layer 7 and is disposed so as to cover the entire belt layer 7, and the reinforcing layer on the outer side in the tire radial direction is disposed so as to cover only the end portion in the tire width direction of the belt layer 7. Alternatively, for example, a configuration in which two reinforcing layers are provided and each reinforcing layer is disposed so as to cover only the end portion in the tire width direction of the belt layer 7 may be employed. That is, the belt reinforcing layer 8 overlaps at least the end portion in the tire width direction of the belt layer 7. The belt reinforcing layer 8 is provided by winding a strip-shaped strip material (for example, a width of 10 [mm]) in the tire circumferential direction.

  Further, when the pneumatic tire 1 of the present embodiment is mounted on a vehicle (not shown), the direction with respect to the inner side and the outer side of the vehicle is specified in the tire width direction. The designation of the direction is not clearly shown in the figure, but is indicated by, for example, an index provided on the sidewall portion 4. Hereinafter, the side facing the inner side of the vehicle when mounted on the vehicle is referred to as the inner side of the vehicle, and the side facing the outer side of the vehicle is referred to as the outer side of the vehicle. The designation of the vehicle inner side and the vehicle outer side is not limited to the case where the vehicle is mounted on the vehicle. For example, when the rim is assembled, the direction of the rim with respect to the inside and outside of the vehicle is determined in the tire width direction. For this reason, when the rim is assembled, the pneumatic tire 1 is designated with respect to the inner side (vehicle inner side) and the outer side (vehicle outer side) of the vehicle in the tire width direction. In the tread portion 2, the vehicle inner side means a range inside the vehicle with respect to the tire equator plane (tire equator line) CL when mounted on the vehicle, and the vehicle outer side means a tire equator when mounted on the vehicle. A range outside the vehicle from the surface (tire equator line) CL.

[Embodiment 1]
3 to 6 are perspective views illustrating a part of the tread portion of the pneumatic tire according to the present embodiment. In the pneumatic tire 1 of the present embodiment, the concave portion 10 is provided on the side wall 23a facing the tire width direction of the block-shaped land portion 23A.

  In the pneumatic tire 1 shown in FIG. 3, the concave portion 10 is provided in one of a plurality of side walls (corresponding to the groove wall of the main groove 22) 23 a facing the tire width direction of the land portions 23 </ b> A arranged in the tire width direction. It has been. A plurality of recesses 10 are provided along the extending direction of the main groove 22 (illustrated as four in this embodiment). Moreover, the recessed part 10 is provided in the side wall 23a arrange | positioned near the vehicle inner side from the tire equator surface CL. Moreover, it is preferable that all the recessed portions 10 have the same volume. Although not clearly shown in the figure, it is preferable that the recesses 10 are provided on the side walls 23a at the same position in the tire width direction in the land portions 23A arranged in the tire circumferential direction, and all have the same volume. In FIG. 3, the recess 10 is the side wall on the innermost side of the vehicle (the side farthest from the tire equatorial plane CL on the inner side of the vehicle) among the plurality of side walls 23 a of the land portions 23 </ b> A aligned in the tire width direction. Although the example arrange | positioned at 23a is shown, you may arrange | position at the other side wall 23a arranged near the vehicle inner side. That is, the pneumatic tire 1 shown in FIG. 3 has a larger volume as the concave portion 10 provided in the side wall 23a near the innermost vehicle and a smaller volume as the concave portion 10 provided in the side wall 23a closer to the outermost vehicle (here, the tire equator). Since the recessed part 10 is not provided in the side wall 23a outside the vehicle from the surface CL, the volume is 0).

  According to the pneumatic tire 1 shown in FIG. 3, the groove cross-sectional area of the main groove 22 is increased by the recess 10, so that the drainage of the main groove 22 is improved. For this reason, it becomes possible to improve drainage performance. In addition, since the recess 10 is provided on the side wall 23a of the land portion 23A that is disposed closer to the vehicle inner side than the tire equator CL, the land on the vehicle inner side is more rigid than the rigidity of the land portion 23A on the outer side of the vehicle on which the recess 10 is provided. The rigidity of the portion 23A is reduced. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion 10 is provided on the side wall 23a of the land portion 23A, the rigidity of the land portion 23A is lowered, so that the steering stability performance during turning tends to be deteriorated. In this regard, according to this pneumatic tire 1, the concave portion 10 is provided on the side wall 23a of the land portion 23A that is disposed closer to the vehicle inner side than the tire equator plane CL, so that the land portion on the inner side of the vehicle provided with the concave portion 10 is provided. The rigidity of the land portion 23A outside the vehicle is higher than the rigidity of 23A. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

  In the pneumatic tire 1 shown in FIGS. 4 to 6, the recesses 10 are provided on at least two of the plurality of side walls 23 a facing the tire width direction of the land portions 23 </ b> A arranged in the tire width direction. A plurality of recesses 10 are provided along the extending direction of the main groove 22 (illustrated as four in this embodiment). Further, the concave portion 10 is formed such that the concave portion 10 provided on the side wall 23a near the innermost side of the vehicle has a larger volume, and the concave portion 10 provided on the side wall 23a closer to the outermost side of the vehicle has a smaller volume. The volume of the recess 10 can be changed depending on the diameter of the recess 10 and the depth with respect to the side wall 23a. Moreover, it is preferable that each recessed part 10 provided in the same side wall 23a is made into the same volume. Further, although not explicitly shown in each drawing, it is preferable that the recesses 10 are provided on the side wall 23a at the same position in the tire width direction in the land portions 23A arranged in the tire circumferential direction, and all have the same volume.

  In FIG. 4, the recessed part 10 is arrange | positioned at the one side wall 23a facing the tire width direction of the different land part 23A located in a line with a tire width direction.

  In FIG. 5, the recessed part 10 is arrange | positioned at the both-sides wall 23a which faces one tire width direction among the land parts 23A arranged in a tire width direction. In FIG. 5, the recess 10 is the land on the innermost side of the vehicle (the side farthest from the tire equatorial plane CL on the inner side of the vehicle) among the plurality of side walls 23a facing the tire width direction of the land portions 23A arranged in the tire width direction. Although the example arrange | positioned at the side wall 23a of the part 23A is shown, it may be arrange | positioned at the other side wall 23a arranged near the vehicle inner side.

  In FIG. 6, the recessed part 10 is arrange | positioned at the side wall 23a facing the tire width direction of all the land parts 23A arranged in a tire width direction. The concave portion 10 is formed such that the volume of the concave portion 10 provided in the innermost side wall 23a is the largest, and the volume of the concave portion 10 gradually decreases toward the outer side wall 23a.

  According to the pneumatic tire 1 shown in FIGS. 4 to 6, since the groove cross-sectional area of the main groove 22 is increased by the recess 10, the drainage of the main groove 22 is improved. For this reason, it becomes possible to improve drainage performance. In addition, the concave portion 10 provided in at least two side walls 23a arranged in the tire width direction has a larger volume as the concave portion 10 provided in the side wall 23a closer to the innermost side of the vehicle, and the volume of the concave portion 10 provided in the side wall 23a closer to the outermost side of the vehicle. Is made smaller, the rigidity of the land portion 23A on the vehicle inner side is lower than the rigidity of the land portion 23A on the vehicle outer side provided with the recess 10. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion 10 is provided on the side wall 23a of the land portion 23A, the rigidity of the land portion 23A is lowered, so that the steering stability performance during turning tends to be deteriorated. In this regard, according to this pneumatic tire 1, the concave portion 10 provided on at least two side walls 23a arranged in the tire width direction has a larger volume as the concave portion 10 provided on the side wall 23a closer to the innermost side of the vehicle, and on the outermost side of the vehicle. Since the concave portion 10 provided in the closer side wall 23a is formed to have a smaller volume, the rigidity of the land portion 23A on the vehicle outer side is higher than the rigidity of the land portion 23A on the vehicle inner side where the recess 10 is provided. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

  In order to obtain the effect of improving the riding comfort performance and the effect of improving the steering stability performance, as shown in FIG. 6, all the land portions 23 </ b> A arranged in the tire width direction have sidewalls 23 a facing the tire width direction. A configuration in which the concave portion 10 is disposed, the volume of the concave portion 10 provided on the innermost side wall 23a is maximum, and the volume of the concave portion 10 gradually decreases toward the outer side wall 23a is most preferable. If it is this form, it will become possible to suppress the rigidity difference of adjacent land part 23A, and to suppress generation | occurrence | production of partial wear.

  FIG. 7 is an enlarged perspective view showing a part of the tread portion of the pneumatic tire according to the present embodiment. As shown in FIG. 7, the pneumatic tire 1 shown in FIGS. 3 to 6 is a distance D1 from the groove bottom of the main groove 22 forming the side wall 23a provided with the recess 10 to the center position in the tire radial direction of the recess 10. And the groove depth D of the main groove 22 preferably satisfy the range of 0.10 ≦ D1 / D ≦ 0.60. The reference for the distance D1 is the concave portion 10 at the innermost side in the tire radial direction when the minimum value is D1 / D, and the concave portion 10 at the outermost side in the tire radial direction when D1 / D is the maximum value.

  When D1 / D is less than 0.10 or exceeds 0.60, the concave portion 10 is provided in the vicinity of the base of the land portion 23A or in the vicinity of the tip, so that the effect of causing a difference in rigidity of the land portion 23A is low. On the other hand, when D1 / D is in the range of 0.10 or more and 0.60 or less, since the concave portion 10 is provided near the center of the land portion 23A, the effect of causing the rigidity difference of the land portion 23A is remarkably obtained.

  8 and 9 are enlarged cross-sectional views showing the recesses of the pneumatic tire according to the present embodiment. The cross-sectional shape of the recess 10 is preferably, for example, a semicircular shape as shown in FIG. 8 or a substantially trapezoidal shape with a groove width narrowed toward the groove bottom side as shown in FIG. In addition, although not explicitly shown in the drawing, the cross-sectional shape of the concave portion 10 may be a triangular shape, a quadrangular shape, or a shape having a convex portion inside the concave portion. Moreover, the opening shape of the recessed part 10 has a preferable circular shape as shown in FIGS. In addition, although not shown in the drawing, the opening shape of the recess 10 may be an elliptical shape, an oval shape, a polygonal shape, or the like.

  In addition, as shown in FIGS. 7 to 9, the pneumatic tire 1 of the present embodiment has an opening width B <b> 1 of the recess 10 having the maximum volume and a groove depth of the main groove 22 that forms the side wall 23 a where the recess 10 is provided. D satisfies the range of 0.04 ≦ B1 / D ≦ 0.5, the opening width B2 of the recess 10 having the minimum volume, and the groove depth D of the main groove 22 forming the side wall 23a in which the recess 10 is provided, Satisfies the range of 0.02 ≦ B2 / D ≦ 0.4, and the depth A1 of the concave portion 10 having the maximum volume and the length Lh in the tire width direction in the land portion 23A where the concave portion 10 is provided are 0.04. ≦ A1 / Lh ≦ 0.4 While satisfying the range of depth A2 of the recess 10 having the minimum volume and the tire width direction length Lh in the land portion 23A where the recess 10 is provided, 0.02 ≦ A2 / Lh It is preferable to satisfy the range of ≦ 0.3.

  In the pneumatic tire 1 of the present embodiment, the total volume Vout of the concave portion 10 in the side wall 23a provided with the concave portion 10 and the outermost side of the vehicle, and the concave portion 10 in the side wall 23a provided with the concave portion 10 and the innermost side of the vehicle. It is preferable that the total volume Vin satisfies the range of 1.5 ≦ Vin / Vout ≦ 80.

  According to this pneumatic tire 1, by setting Vin / Vout within the above range, the balance of the difference in rigidity of the land portion 23A can be maintained, and the effect of improving the riding comfort performance and the effect of improving the steering stability performance are remarkable. It becomes possible to obtain.

  In the pneumatic tire 1 of the present embodiment, the tire circumferential length Ld excluding the concave portion 10 and the total tire circumferential length Lw on the side wall 23a provided with the concave portion 10 are 0.05 ≦ Ld /. It is preferable to satisfy the range of Lw ≦ 0.70.

  According to this pneumatic tire 1, by setting Ld / Lw within the above range, the balance of the difference in rigidity of the land portion 23A can be maintained, and the effect of improving the riding comfort performance and the effect of improving the steering stability performance are remarkable. It becomes possible to obtain.

  FIG. 10 is a plan view showing a tread portion of a pneumatic tire according to a modification of the present embodiment. In the above-described embodiment, the pneumatic tire 1 in which the main groove 22 and the lug groove 24 form the block-shaped land portion 23 </ b> A in the tread portion 2 has been described. As a modified example, as shown in FIG. 10, the lug groove 24 is not provided (or one end of the lug groove 24 does not open to the main groove 22), and the rib-like land portion 23 is formed in the tread portion 2 by the main groove 22. In the formed pneumatic tire 1, a plurality of recesses 10 are formed along the extending direction of the main groove 22 with respect to at least one of the plurality of side walls 23 a facing the tire width direction of the land portions 23 aligned in the tire width direction. (Not shown) may be provided.

  As shown in FIGS. 3 to 6, the volume of the concave portion 10 provided on the side wall 23 a close to the innermost side of the vehicle is larger, and the volume of the concave portion 10 provided on the side wall 23 a close to the outermost side of the vehicle is smaller (tire equatorial plane). The volume when the concave portion 10 is not provided in the side wall 23a outside the vehicle from the CL is 0).

  According to the pneumatic tire 1 shown in FIG. 10, the groove cross-sectional area of the main groove 22 is increased by the recess 10, so that the drainage of the main groove 22 is improved. For this reason, it becomes possible to improve drainage performance. In addition, the concave portion 10 is provided on the side wall 23a of the land portion 23A arranged closer to the vehicle inner side than the tire equatorial plane CL, or the concave portion 10 provided on at least two side walls 23a arranged in the tire width direction is close to the innermost side of the vehicle. The concave portion 10 provided on the side wall 23a has a larger volume, and the concave portion 10 provided on the side wall 23a closer to the vehicle outermost side has a smaller volume. Thus, the rigidity of the land portion 23A outside the vehicle provided with the concave portion 10 can be increased. The rigidity of the land portion 23A inside the vehicle becomes low. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion 10 is provided on the side wall 23a of the land portion 23A, the rigidity of the land portion 23A is lowered, so that the steering stability performance during turning tends to be deteriorated. In this regard, according to the pneumatic tire 1, the concave portion 10 is provided on the side wall 23a of the land portion 23A arranged closer to the vehicle inner side than the tire equatorial plane CL, or provided on at least two side walls 23a aligned in the tire width direction. The concave portion 10 is provided with a larger volume as the concave portion 10 provided on the side wall 23a near the innermost side of the vehicle and a smaller volume as the concave portion 10 provided on the side wall 23a closer to the outermost side of the vehicle. The rigidity of the land portion 23A outside the vehicle is higher than the rigidity of the land portion 23A inside the vehicle. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

[Embodiment 2]
FIGS. 11-14 is a perspective view which shows a part of tread part of the pneumatic tire which concerns on this embodiment. In the pneumatic tire 1 of the present embodiment, the concave portion 11 is provided on the side wall 23b facing the tire circumferential direction of the block-shaped land portion 23A.

  In the pneumatic tire 1 shown in FIG. 11, the concave portion 11 is one of the land portions 23A arranged in the tire width direction and each side wall (groove wall of the lug groove 24) facing the tire circumferential direction of the land portion 23A. Equivalent to) 23b. A plurality of recesses 11 are provided along the extending direction of the lug grooves 24 (illustrated as four in this embodiment). Moreover, the recessed part 11 is provided in the side wall 23b arrange | positioned near the vehicle inner side from the tire equator surface CL. In addition, it is preferable that all the recesses 11 have the same volume. Although not clearly shown in the figure, it is preferable that the recesses 11 are provided on the side walls 23b of the land portions 23A arranged in the tire circumferential direction and have the same volume. In FIG. 11, the recess 11 is disposed on the side wall 23 b of the land portion 23 </ b> A on the innermost side of the vehicle (the side farthest from the tire equatorial plane CL on the inner side of the vehicle) among the land portions 23 </ b> A aligned in the tire width direction. Although an example is shown, you may provide in the side wall 23b of the other land part 23A arranged near the vehicle inner side. That is, the pneumatic tire 1 shown in FIG. 11 has a larger volume as the recess 11 provided in the side wall 23b near the innermost side of the vehicle and a smaller volume as the recess 11 provided in the side wall 23b closer to the outermost side of the vehicle (here, the tire equator). Since the recess 11 is not provided on the side wall 23b outside the surface CL, the volume is 0).

  According to the pneumatic tire 1 shown in FIG. 11, the groove cross-sectional area of the lug groove 24 is increased by the recess 11, so that the drainage of the lug groove 24 is improved. For this reason, it becomes possible to improve drainage performance. In addition, since the recess 11 is provided on the side wall 23b of the land portion 23A that is disposed closer to the vehicle inner side than the tire equator CL, the land on the vehicle inner side is more rigid than the rigidity of the land portion 23A on the vehicle outer side where the recess 11 is provided. The rigidity of the portion 23A is reduced. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle goes straight. On the other hand, if the concave portion 11 is provided on the side wall 23b of the land portion 23A, the rigidity of the land portion 23A is lowered, so that the steering stability performance at the time of turning tends to deteriorate. In this regard, according to this pneumatic tire 1, the concave portion 11 is provided on the side wall 23b of the land portion 23A arranged closer to the vehicle inner side than the tire equatorial plane CL, so that the land portion on the inner side of the vehicle provided with the concave portion 11 is provided. The rigidity of the land portion 23A outside the vehicle is higher than the rigidity of 23A. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

  In the pneumatic tire 1 shown in FIGS. 12 to 14, the recess 11 is provided on each side wall 23 b that is at least two land portions 23 </ b> A arranged in the tire width direction and faces the tire circumferential direction of the land portion 23 </ b> A. A plurality of recesses 11 are provided along the extending direction of the lug grooves 24 (illustrated as four in this embodiment). Further, the concave portion 11 is formed such that the concave portion 11 provided on the side wall 23b near the innermost side of the vehicle has a larger volume and the concave portion 11 provided on the side wall 23b closer to the outermost side of the vehicle has a smaller volume. The volume of the recess 11 can be changed by the diameter of the recess 11 and the depth with respect to the side wall 23b. Moreover, it is preferable that each recessed part 11 provided in each side wall 23b facing the tire circumferential direction of one land part 23A is made the same in volume. Although not clearly shown in the figure, it is preferable that the recesses 11 are provided on the side walls 23b at the same position in the tire width direction in the land portions 23A arranged in the tire circumferential direction, and all have the same volume.

  In FIG. 12, the recessed part 11 is arrange | positioned at the side wall 23b facing the tire circumferential direction of the different land part 23A located in a line with a tire width direction.

  In FIG. 13, the recesses 11 are arranged on the side walls 23 b facing all the land portions 23 </ b> A aligned in the tire width direction in the tire circumferential direction.

  In FIG. 14, the recess 11 is disposed on the side wall 23 b facing all the land portions 23 </ b> A aligned in the tire width direction. Each recessed part 11 provided in each side wall 23b facing the tire circumferential direction of one land portion 23A is formed such that the volume gradually decreases from the vehicle inner side toward the vehicle outer side.

  According to the pneumatic tire 1 shown in FIGS. 12 to 14, since the groove cross-sectional area of the lug groove 24 is increased by the recess 11, the drainage of the lug groove 24 is improved. For this reason, it becomes possible to improve drainage performance. In addition, the concave portion 11 provided on the side wall 23b of at least two land portions 23A arranged in the tire width direction has a larger volume as the concave portion 11 provided on the side wall 23b closer to the innermost side of the vehicle, and is provided on the side wall 23b closer to the outermost side of the vehicle. By forming the volume as small as the recess 11, the rigidity of the land portion 23 </ b> A inside the vehicle is lower than the rigidity of the land portion 23 </ b> A outside the vehicle provided with the recess 11. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle goes straight. On the other hand, if the concave portion 11 is provided on the side wall 23b of the land portion 23A, the rigidity of the land portion 23A is lowered, so that the steering stability performance at the time of turning tends to deteriorate. In this regard, according to the pneumatic tire 1, the concave portion 11 provided on the side wall 23b of at least two land portions 23A arranged in the tire width direction has a larger volume as the concave portion 11 provided on the side wall 23b closer to the innermost side of the vehicle. Since the volume of the concave portion 11 provided on the side wall 23b near the outermost vehicle is smaller, the rigidity of the land portion 23A outside the vehicle is higher than the rigidity of the land portion 23A inside the vehicle where the concave portion 11 is provided. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

  In order to obtain the effect of improving the riding comfort performance and the effect of suppressing the deterioration of the steering stability performance, as shown in FIG. 14, the sidewalls 23b facing the tire circumferential direction of all the land portions 23A aligned in the tire width direction are used. It is most preferable that the concave portions 11 are disposed and the concave portions 11 provided on the side walls 23b facing the tire circumferential direction of one land portion 23A gradually decrease in volume from the vehicle inner side toward the vehicle outer side. If it is this form, it will become possible to suppress the rigidity difference of adjacent land part 23A, and to suppress generation | occurrence | production of partial wear.

  FIG. 15 is an enlarged perspective view showing a part of the tread portion of the pneumatic tire according to the present embodiment. In the pneumatic tire 1 shown in FIGS. 11 to 14, as shown in FIG. 15, a distance D <b> 1 from the groove bottom of the lug groove 24 forming the side wall 23 b provided with the recess 11 to the center position in the tire radial direction of the recess 11. It is preferable that (D1 ′) and the groove depth D (D ′) of the lug groove 24 satisfy the range of 0.10 ≦ D1 / D ≦ 0.60. The reference of the distance D1 (D1 ′) when a plurality of recesses 11 are provided is the recess 11 on the innermost side in the tire radial direction in the case of the minimum value D1 / D, and the reference in the case of the maximum value D1 / D. It is the recessed part 11 of a tire radial direction outer side.

  When D1 / D is less than 0.10 or exceeds 0.60, the concave portion 11 is provided in the vicinity of the base of the land portion 23A or in the vicinity of the tip, so that the effect of causing a difference in rigidity of the land portion 23A is low. On the other hand, when D1 / D is in the range of 0.10 or more and 0.60 or less, since the concave portion 11 is provided near the center of the land portion 23A, the effect of causing the rigidity difference of the land portion 23A is remarkably obtained.

  The cross-sectional shape of the recess 11 is preferably, for example, a semicircular shape as shown in FIG. 8 or a substantially trapezoidal shape with a groove width narrowed toward the groove bottom side as shown in FIG. In addition, although not explicitly shown in the drawing, the cross-sectional shape of the concave portion 11 may be a triangular shape, a quadrangular shape, or a shape having a convex portion inside the concave portion. Moreover, the opening shape of the recessed part 11 has a preferable circular shape as shown in FIGS. In addition, although not shown in the figure, the opening shape of the recess 11 may be an elliptical shape, an oval shape, a polygonal shape, or the like.

  In addition, as shown in FIGS. 8, 9, and 15, the pneumatic tire 1 of the present embodiment includes an opening width B1 of the concave portion 11 having the maximum volume and a main groove 22 that forms a side wall 23a in which the concave portion 11 is provided. The groove depth D satisfies the range of 0.04 ≦ B1 / D ≦ 0.5, and the opening width B2 of the recess 11 having the minimum volume and the groove depth of the main groove 22 forming the side wall 23a in which the recess 11 is provided. The depth A satisfies the range of 0.02 ≦ B2 / D ≦ 0.4, and the depth A1 of the concave portion 11 having the maximum volume and the tire width direction length Lh in the land portion 23A where the concave portion 11 is provided, While satisfying the range of 0.04 ≦ A1 / Lh ≦ 0.4, the depth A2 of the recess 11 having the minimum volume and the tire width direction length Lh in the land portion 23A where the recess 11 is provided are 0.02 ≦ It is preferable to satisfy the range of A2 / Lh ≦ 0.3.

  In the pneumatic tire 1 of the present embodiment, the total volume Vout ′ of the concave portion 11 in the land portion 23A provided with the concave portion 11 and on the outermost side of the vehicle, and the land portion 23A provided with the concave portion 11 and provided on the innermost side of the vehicle. It is preferable that the total volume Vin ′ of the recesses 11 satisfies a range of 1.5 ≦ Vin ′ / Vout ′ ≦ 80.

  By setting Vin ′ / Vout ′ in the above range, the balance of the difference in rigidity of the land portion 23A can be maintained, and the effect of improving the ride comfort performance and the effect of improving the steering stability performance can be obtained remarkably.

  Further, in the pneumatic tire 1 of the present embodiment, the tire width direction length Ld ′ excluding the recess 11 and the total tire width direction length Lw ′ of the side wall 23b provided with the recess 11 are 0.05 ≦. It is preferable to satisfy the range of Ld ′ / Lw ′ ≦ 0.70.

  According to this pneumatic tire 1, by setting Ld ′ / Lw ′ within the above range, the balance of the rigidity difference of the land portion 23A can be maintained, and the effect of improving the riding comfort performance and the effect of improving the steering stability performance can be achieved. It becomes possible to obtain significantly.

[Embodiment 3]
FIGS. 16-18 is a perspective view which shows a part of tread part of the pneumatic tire which concerns on this embodiment. The pneumatic tire according to the present embodiment includes both the pneumatic tire 1 according to the first embodiment and the second embodiment described above, and the recess 10 is provided in the side wall 23a facing the tire width direction of the block-shaped land portion 23A. And the recessed part 11 is provided in the side wall 23b which faces the tire circumferential direction of the block-shaped land part 23A.

  In the pneumatic tire 1 shown in FIG. 16, the recess 10 is provided in one of a plurality of side walls (corresponding to the groove wall of the main groove 22) 23 a facing the tire width direction of the land portions 23 </ b> A arranged in the tire width direction. It has been. A plurality of recesses 10 are provided along the extending direction of the main groove 22 (illustrated as four in this embodiment). Moreover, the recessed part 10 is provided in the side wall 23a arrange | positioned near the vehicle inner side from the tire equator surface CL. Moreover, it is preferable that all the recessed portions 10 have the same volume. Although not clearly shown in the figure, it is preferable that the recesses 10 are provided on the side walls 23a at the same position in the tire width direction in the land portions 23A arranged in the tire circumferential direction, and all have the same volume. In FIG. 16, the recess 10 is the side wall on the innermost side of the vehicle (the side farthest from the tire equator plane CL on the inner side of the vehicle) among the plurality of side walls 23 a facing the tire width direction of the land portions 23 </ b> A arranged in the tire width direction. Although the example arrange | positioned at 23a is shown, you may arrange | position at the other side wall 23a arranged near the vehicle inner side. That is, the pneumatic tire 1 shown in FIG. 16 has a larger volume as the concave portion 10 is provided on the side wall 23a near the innermost side of the vehicle, and has a smaller volume as the concave portion 10 is provided on the side wall 23a closer to the outermost side of the vehicle. Since the recessed part 10 is not provided in the side wall 23a outside the vehicle from the surface CL, the volume is 0).

  Further, in the pneumatic tire 1 shown in FIG. 16, the recess 11 is one of the land portions 23A arranged in the tire width direction and each side wall (the lug groove 24 of the lug groove 24) facing the tire circumferential direction of the land portion 23A. (Corresponding to the groove wall) 23b. A plurality of recesses 11 are provided along the extending direction of the lug grooves 24 (illustrated as four in this embodiment). Moreover, the recessed part 11 is provided in the side wall 23b arrange | positioned near the vehicle inner side from the tire equator surface CL. In addition, it is preferable that all the recesses 11 have the same volume. Although not clearly shown in the figure, it is preferable that the recesses 11 are provided on the side walls 23b of the land portions 23A arranged in the tire circumferential direction and have the same volume. In FIG. 16, the recess 11 is disposed on the side wall 23b of the land portion 23A on the innermost side of the vehicle (the side farthest from the tire equatorial plane CL on the inner side of the vehicle) among the land portions 23A arranged in the tire width direction. Although an example is shown, you may provide in the side wall 23b of the other land part 23A arranged near the vehicle inner side. That is, the pneumatic tire 1 shown in FIG. 16 has a larger volume as the recess 11 provided in the side wall 23b near the innermost vehicle and a smaller volume as the recess 11 provided in the side wall 23b closer to the outermost vehicle (here, the tire equator). Since the recess 11 is not provided on the side wall 23b outside the surface CL, the volume is 0).

  According to the pneumatic tire 1 shown in FIG. 16, the groove cross-sectional areas of the main groove 22 and the lug groove 24 are increased by the recess 10 and the recess 11, so that the drainage of the main groove 22 and the lug groove 24 is improved. For this reason, it becomes possible to improve drainage performance. Moreover, the concave portion 10 is provided on the side wall 23a of the land portion 23A disposed closer to the vehicle inner side than the tire equator plane CL, and the concave portion 11 is disposed on the vehicle inner side closer to the vehicle inner side than the tire equator plane CL. As a result, the rigidity of the land portion 23A on the vehicle inner side is lower than the rigidity of the land portion 23A on the vehicle outer side where the concave portion 10 and the concave portion 11 are provided. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle goes straight. On the other hand, if the concave portion 10 is provided on the side wall 23a of the land portion 23A and the concave portion 11 is provided on the side wall 23b of the land portion 23A, the rigidity of the land portion 23A is reduced, so that the steering stability performance during turning tends to deteriorate. . In this regard, according to this pneumatic tire 1, the concave portion 10 is provided on the side wall 23a of the land portion 23A disposed closer to the vehicle inner side than the tire equator surface CL, and the concave portion 11 is closer to the vehicle inner side than the tire equator surface CL. By providing the land portion 23A on the side wall 23b, the rigidity of the land portion 23A outside the vehicle is higher than the rigidity of the land portion 23A inside the vehicle provided with the recess 10 and the recess 11. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

  In the pneumatic tire 1 shown in FIGS. 17 and 18, the recesses 10 are provided on at least two of the plurality of side walls 23a facing the tire width direction of the land portions 23A arranged in the tire width direction. A plurality of recesses 10 are provided along the extending direction of the main groove 22 (illustrated as four in this embodiment). Further, the concave portion 10 is formed such that the concave portion 10 provided on the side wall 23a near the innermost side of the vehicle has a larger volume, and the concave portion 10 provided on the side wall 23a closer to the outermost side of the vehicle has a smaller volume. The volume of the recess 10 can be changed depending on the diameter of the recess 10 and the depth with respect to the side wall 23a. Moreover, it is preferable that each recessed part 10 provided in the same side wall 23a is made into the same volume. Further, although not explicitly shown in each drawing, it is preferable that the recesses 10 are provided on the side wall 23a at the same position in the tire width direction in the land portions 23A arranged in the tire circumferential direction, and all have the same volume.

  Further, in the pneumatic tire 1 shown in FIGS. 17 and 18, the recess 11 is provided on each side wall 23b that is at least two land portions 23A arranged in the tire width direction and faces the tire circumferential direction of the land portion 23A. Yes. A plurality of recesses 11 are provided along the extending direction of the lug grooves 24 (illustrated as four in this embodiment). Further, the concave portion 11 is formed such that the concave portion 11 provided on the side wall 23b near the innermost side of the vehicle has a larger volume and the concave portion 11 provided on the side wall 23b closer to the outermost side of the vehicle has a smaller volume. The volume of the recess 11 can be changed by the diameter of the recess 11 and the depth with respect to the side wall 23b. Moreover, it is preferable that each recessed part 11 provided in each side wall 23b facing the tire circumferential direction of one land part 23A is made the same in volume. Although not clearly shown in the figure, it is preferable that the recesses 11 are provided on the side walls 23b at the same position in the tire width direction in the land portions 23A arranged in the tire circumferential direction, and all have the same volume.

  In FIG. 17, the recessed part 10 is arrange | positioned at the one side wall 23a facing the tire width direction of the different land part 23A located in a line with a tire width direction. Moreover, the recessed part 11 is arrange | positioned at the side wall 23b facing the tire circumferential direction of the different land part 23A located in a line in the tire width direction.

  In FIG. 18, the recessed part 10 is arrange | positioned at the side wall 23a facing the tire width direction of all the land parts 23A arranged in a tire width direction. The concave portion 10 is formed such that the volume of the concave portion 10 provided in the innermost side wall 23a is the largest, and the volume of the concave portion 10 gradually decreases toward the outer side wall 23a. Moreover, the recessed part 11 is arrange | positioned at the side wall 23b facing the tire circumferential direction of all the land parts 23A arranged in a tire width direction. Each recessed part 11 provided in each side wall 23b facing the tire circumferential direction of one land portion 23A is formed such that the volume gradually decreases from the vehicle inner side toward the vehicle outer side.

  According to the pneumatic tire 1 shown in FIGS. 17 and 18, the groove cross-sectional areas of the main groove 22 and the lug groove 24 are increased by the recess 10 and the recess 11, so that the drainage of the main groove 22 and the lug groove 24 is good. Become. For this reason, it becomes possible to improve drainage performance. In addition, the concave portion 10 provided in at least two side walls 23a arranged in the tire width direction has a larger volume as the concave portion 10 provided in the side wall 23a closer to the innermost side of the vehicle, and the concave portion 10 provided in the side wall 23b closer to the outermost side of the vehicle. And the recesses 11 provided on the side walls 23b of the at least two land portions 23A arranged in the tire width direction are larger in volume as the recesses 11 are provided on the side walls 23b closer to the innermost side of the vehicle, and closer to the outermost side of the vehicle. Since the volume of the recess 11 provided in 23a is smaller, the rigidity of the land portion 23A on the vehicle inner side is lower than the rigidity of the land portion 23A on the vehicle outer side where the recess 10 and the recess 11 are provided. The land portion 23A on the inner side of the vehicle is highly loaded and contributes to ride comfort performance when traveling straight. For this reason, it is possible to improve the riding comfort performance because the load is received by the land portion 23A inside the vehicle having low rigidity when the vehicle is traveling straight. On the other hand, if the concave portion 10 is provided on the side wall 23a of the land portion 23A and the concave portion 11 is provided on the side wall 23b of the land portion 23A, the rigidity of the land portion 23A is reduced, so that the steering stability performance during turning tends to deteriorate. . In this regard, according to this pneumatic tire 1, the concave portion 10 provided on at least two side walls 23a arranged in the tire width direction has a larger volume as the concave portion 10 provided on the side wall 23a closer to the innermost side of the vehicle, and the outermost side of the vehicle. The recessed portion 11 formed in the side wall 23b of the at least two land portions 23A arranged in the tire width direction has a smaller volume as the recessed portion 10 provided in the closer side wall 23a, and the recessed portion 11 provided in the side wall 23b closer to the vehicle innermost side. Since the volume of the concave portion 11 provided on the side wall 23b close to the outermost side of the vehicle is smaller, the land portion 23A on the outer side of the vehicle is more rigid than the rigidity of the land portion 23A on the inner side of the vehicle on which the concave portion 10 and the concave portion 11 are provided. Increased rigidity. The land portion 23A on the outside of the vehicle is loaded more than the inside of the vehicle when the vehicle turns, and contributes to the steering stability performance. For this reason, since the load is received by the land portion 23A outside the vehicle having high rigidity when the vehicle is turning, it is possible to suppress the deterioration of the steering stability performance.

  In order to obtain the effect of improving the riding comfort performance and the effect of suppressing the deterioration of the steering stability performance, as shown in FIG. 18, the sidewalls 23a facing the tire width direction of all land portions 23A aligned in the tire width direction are provided. A configuration in which the concave portion 10 is arranged, the volume of the concave portion 10 on the innermost side of the vehicle is maximum, and the volume of the concave portion 10 gradually decreases toward the outer side of the vehicle is most preferable. If it is this form, it will become possible to suppress the rigidity difference of adjacent land part 23A, and to suppress generation | occurrence | production of partial wear. Furthermore, in order to obtain the effect of improving the ride comfort performance and the effect of suppressing the deterioration of the steering stability performance, as shown in FIG. 18, the side walls 23b facing the tire circumferential direction of all land portions 23A aligned in the tire width direction are used. It is most preferable that the concave portions 11 are disposed and the concave portions 11 provided on the side walls 23b facing the tire circumferential direction of one land portion 23A gradually decrease in volume from the vehicle inner side toward the vehicle outer side. If it is this form, it will become possible to suppress the rigidity difference of adjacent land part 23A, and to suppress generation | occurrence | production of partial wear.

  Note that the pneumatic tire 1 of the present embodiment is similar to the above-described first and second embodiments (see FIGS. 7 and 15), from the groove bottom of the main groove 22 that forms the side wall 23 a provided with the recess 10. It is preferable that the distance D1 to the center position in the tire radial direction of the concave portion 10 and the groove depth D of the main groove 22 satisfy a range of 0.10 ≦ D1 / D ≦ 0.60. The reference for the distance D1 is the concave portion 10 at the innermost side in the tire radial direction when the minimum value is D1 / D, and the concave portion 10 at the outermost side in the tire radial direction when D1 / D is the maximum value. Moreover, the distance D1 (D1 ′) from the groove bottom of the lug groove 24 forming the side wall 23b provided with the recess 11 to the center position in the tire radial direction of the recess 11 and the groove depth D (D ′ of the lug groove 24). ) Preferably satisfies the range of 0.10 ≦ D1 / D ≦ 0.60. The reference of the distance D1 (D1 ′) when a plurality of recesses 11 are provided is the recess 11 on the innermost side in the tire radial direction in the case of the minimum value D1 / D, and the reference in the case of the maximum value D1 / D. It is the recessed part 11 of a tire radial direction outer side.

  When D1 / D is less than 0.10 or exceeds 0.60, the concave portion 10 is provided in the vicinity of the base of the land portion 23A or in the vicinity of the tip, so that the effect of causing a difference in rigidity of the land portion 23A is low. On the other hand, when D1 / D is in the range of 0.10 or more and 0.60 or less, since the concave portion 10 is provided near the center of the land portion 23A, the effect of causing the rigidity difference of the land portion 23A is remarkably obtained.

  Moreover, the cross-sectional shape of the recessed part 10 and the recessed part 11 is made into the substantially trapezoid which narrowed the groove width toward the groove bottom side as shown, for example in FIG. preferable. In addition, although not explicitly shown in the drawing, the cross-sectional shape of the concave portion 10 and the concave portion 11 may be a triangular shape, a square shape, a shape having a convex portion inside the concave portion, or the like. Moreover, the opening shape of the recessed part 10 and the recessed part 11 has a preferable circular shape as shown in FIGS. In addition, although not shown in the drawing, the opening shape of the recess 10 may be an elliptical shape, an oval shape, a polygonal shape, or the like.

  Moreover, as shown in FIGS. 7 to 9 and 15, the pneumatic tire 1 of the present embodiment forms an opening width B <b> 1 of the recesses 10 and 11 having the maximum volume and a side wall 23 a on which the recesses 10 and 11 are provided. The groove depth D of the main groove 22 satisfies the range of 0.04 ≦ B1 / D ≦ 0.5, the opening width B2 of the recesses 10 and 11 having the minimum volume, and the side wall 23a on which the recesses 10 and 11 are provided. The depth D of the main groove 22 that satisfies the above condition satisfies the range of 0.02 ≦ B2 / D ≦ 0.4, and the depth A1 of the concave portions 10 and 11 having the maximum volume and the land on which the concave portions 10 and 11 are provided. The length Lh in the tire width direction in the portion 23A satisfies the range of 0.04 ≦ A1 / Lh ≦ 0.4, and the depth A2 of the recesses 10 and 11 having the minimum volume and the land on which the recesses 10 and 11 are provided. The length Lh in the tire width direction in the portion 23A is 0.02 ≦ A It is preferable to satisfy the range of /Lh≦0.3.

  In the pneumatic tire 1 of the present embodiment, the total volume Vout of the concave portion 10 in the side wall 23a provided with the concave portion 10 and the outermost side of the vehicle, and the concave portion 10 in the side wall 23a provided with the concave portion 10 and the innermost side of the vehicle. It is preferable that the total volume Vin satisfies the range of 1.5 ≦ Vin / Vout ≦ 80.

  Moreover, in the pneumatic tire 1 of the present embodiment, the total volume Vout ′ of the concave portion 11 in the land portion 23A provided with the concave portion 11 and on the outermost side of the vehicle, and the land portion 23A provided with the concave portion 11 and provided on the innermost side of the vehicle. It is preferable that the total volume Vin ′ of the recesses 11 satisfies a range of 1.5 ≦ Vin ′ / Vout ′ ≦ 80.

  According to this pneumatic tire 1, by setting Vin / Vout and Vin ′ / Vout ′ within the above ranges, it is possible to maintain the balance of the rigidity difference of the land portion 23A, and to improve the riding comfort performance and the steering stability performance. It is possible to obtain a remarkable improvement effect.

  In the pneumatic tire 1 of the present embodiment, the tire circumferential length Ld excluding the concave portion 10 and the total tire circumferential length Lw on the side wall 23a provided with the concave portion 10 are 0.05 ≦ Ld /. It is preferable to satisfy the range of Lw ≦ 0.70.

  Moreover, in the pneumatic tire 1 of the present embodiment, the tire width direction length Ld ′ excluding the recess 11 and the total tire width direction length Lw ′ of the side wall 23b provided with the recess 11 are 0.05 ≦. It is preferable to satisfy the range of Ld ′ / Lw ′ ≦ 0.70.

  According to this pneumatic tire 1, by setting Ld / Lw and Ld ′ / Lw ′ within the above ranges, the balance of the rigidity difference of the land portion 23 </ b> A can be maintained, and the riding performance performance can be improved and the steering stability performance can be maintained. It is possible to obtain a remarkable improvement effect.

  In this example, performance tests on drainage performance, steering stability performance, and riding comfort performance were performed on multiple types of pneumatic tires with different conditions (see FIGS. 19 to 24).

  In this performance test, a pneumatic tire having a tire size of 215 / 60R16 is assembled on a regular rim, filled with a regular internal pressure (220 [kPa]), and a test vehicle (rear wheel drive vehicle having a displacement of 2500 [cc]) is tested. ).

  The regular rim is “standard rim” defined by JATMA, “Design Rim” defined by TRA, or “Measuring Rim” defined by ETRTO. The normal internal pressure is “maximum air pressure” defined by JATMA, the maximum value described in “TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES” defined by TRA, or “INFLATION PRESSURES” defined by ETRTO.

  The drainage performance is evaluated by measuring the running speed of the test vehicle when the maximum lateral acceleration of the tire occurs when the test vehicle runs on a test course with a water depth of 10 ± 1 [mm] and a turning radius of 100 [m]. taking measurement. Then, based on the measurement result, index evaluation is performed using the conventional pneumatic tire as a reference (100). This evaluation shows that the larger the value, the better the drainage performance.

  Steering stability performance is evaluated by running the dry test course at a speed of 60 [km / h] to 120 [km / h] on the above test vehicle, straight running stability during straight running, lane change and cornering The items of turning stability, rigidity, and steering are evaluated by sensory evaluation by two skilled test drivers. This sensory evaluation gives a score of 1 to 10 points for each item, calculates the average of the scores of two skilled test drivers, and shows this as an index based on the conventional pneumatic tire as a reference (100). If this index is larger than that of the comparative example, it indicates that the deterioration of the steering stability performance is suppressed.

  In the evaluation method of ride comfort performance, the test vehicle is run on a flat and dry test course at a speed of 60 km / h, and the running vibration is evaluated by sensory evaluation by one skilled test driver. This sensory evaluation evaluates the driving vibration in five stages, shows the average of three times as an index based on the conventional pneumatic tire (100), and the larger this index, the better the ride comfort performance Is shown.

  FIG. 19 shows an embodiment in which a concave portion is provided on a side wall of the land portion facing in the tire width direction. In FIG. 19, the conventional pneumatic tire has no recess. Further, the pneumatic tire of Comparative Example 1 is obtained by reversing the vehicle inner side and the vehicle outer side of FIG. Further, the pneumatic tire of Comparative Example 2 has a recess on the side wall of the land portion facing in the tire width direction, but as shown in FIG. 20, the volume of the recess is uniform in the tire width direction. Compare with 4 to Example 11. On the other hand, in FIG. 19, the pneumatic tires of Examples 1 to 11 have recesses in the side walls of the land portion facing the tire width direction, and the volume of the recesses is different in the tire width direction. Example 1 corresponds to FIG. Example 2 corresponds to FIG. Example 3 corresponds to FIG. Examples 4 to 11 correspond to FIG. In Example 5 to Example 11, the position (D1 / D) of the recess is within a specified range. In Examples 8 to 11, the ratio (Vin / Vout) of the total volume of the recesses on the side wall in the tire width direction is within a specified range. In Example 10 and Example 11, the ratio (Ld / Lw) of the tire circumferential direction length on the side wall in the tire width direction is within a specified range.

  FIG. 21 shows an embodiment in which a concave portion is provided on a side wall of the land portion facing the tire circumferential direction. In FIG. 21, the conventional pneumatic tire has no recess. Moreover, the pneumatic tire of Comparative Example 3 is obtained by reversing the vehicle inner side and the vehicle outer side of FIG. 11 and is compared with Example 12. Further, the pneumatic tire of Comparative Example 4 has a recess on the side wall of the land portion facing in the tire circumferential direction. However, as shown in FIG. 22, the volume of the recess is uniform in the tire width direction. Comparison with 15 to Example 22. On the other hand, in FIG. 21, the pneumatic tires of Examples 12 to 22 have recesses on the side walls of the land portion facing the tire circumferential direction, and the volume of the recesses is different in the tire width direction. Example 12 corresponds to FIG. Example 13 corresponds to FIG. Example 14 corresponds to FIG. Examples 15 to 22 correspond to FIG. In Examples 16 to 22, the position (D1 '/ D') of the recess is within a specified range. In Examples 19 to 22, the ratio (Vin ′ / Vout ′) of the total volume of the recesses on the side wall in the tire circumferential direction is within a specified range. In Example 21 and Example 22, the ratio (Ld ′ / Lw ′) of the length in the tire width direction at the side wall in the tire circumferential direction is within a specified range.

  FIG. 23 is an example in which a recess is provided on a side wall of the land portion facing in the tire width direction and the tire circumferential direction. In FIG. 23, the conventional pneumatic tire does not have a recess. Further, the pneumatic tire of Comparative Example 5 is obtained by reversing the vehicle inner side and the vehicle outer side of FIG. In addition, the pneumatic tire of Comparative Example 6 has recesses on the side walls facing the tire width direction and the tire circumferential direction of the land portion. However, as shown in FIG. The volume is equal and compared with Example 25-Example 32. On the other hand, in FIG. 23, the pneumatic tires of Examples 23 to 32 have recesses in the side walls facing the tire width direction and the tire circumferential direction of the land portion, and the volume of the recesses in the tire width direction and the tire circumferential direction is large. Different. Example 23 corresponds to FIG. Example 24 corresponds to FIG. Examples 25 to 32 correspond to FIG. In Examples 26 to 32, the positions of the recesses (D1 / D and D1 '/ D') are within a specified range. In Examples 29 to 32, the ratio (Vin / Vout) of the total volume of the recesses on the side wall facing the tire width direction and the ratio (Vin ′ / Vout ′) of the total volume of the recesses on the side wall facing the tire circumferential direction are specified. Range. In Example 31 and Example 32, the ratio of the tire circumferential direction length (Ld / Lw) on the side wall facing the tire width direction and the ratio of the tire width direction length (Ld '/ Lw') on the side wall facing the tire circumferential direction. Is the prescribed range.

  As shown in the test results of FIGS. 19, 21, and 23, the pneumatic tires of Examples 1 to 32 have improved drainage performance and riding comfort performance, and improved deterioration of steering stability performance. I understand that.

DESCRIPTION OF SYMBOLS 1 Pneumatic tire 2 Tread part 21 Tread surface 22 Main groove 23 (Rib shape) Land part 23A (Block shape) Land part 23a Side wall 23b Side wall 24 Lug groove 10 Concave part 11 Concave part

Claims (9)

In a pneumatic tire provided with a plurality of land portions by designating a direction inside and outside the vehicle at the time of vehicle mounting and forming a plurality of grooves on the tread surface,
A plurality of recesses are provided along the direction in which the groove extends in at least one of the side walls of the at least one land portion arranged in the tire width direction and facing the tire width direction, and are provided on the side wall close to the innermost side of the vehicle. The pneumatic tire according to claim 1, wherein the concave portion has a larger volume, and the concave portion provided on the side wall near the vehicle outermost side has a smaller volume. The land portion is formed in a block shape by a plurality of main grooves extending in the tire circumferential direction and arranged in the tire width direction, and lug grooves intersecting the main grooves,
A plurality of the recesses are provided along the extending direction of the main groove with respect to at least one side wall of the at least one land portion arranged in the tire width direction and facing the tire width direction. 2. The pneumatic tire according to claim 1, wherein the recessed portion provided has a larger total volume, and the recessed portion provided on the side wall closer to the vehicle outermost side has a smaller total volume. In a pneumatic tire provided with a plurality of land portions by designating a direction inside and outside the vehicle at the time of vehicle mounting and forming a plurality of grooves on the tread surface,
The land portion is formed in a block shape by a plurality of main grooves extending in the tire circumferential direction and arranged in the tire width direction, and lug grooves intersecting the main grooves,
The recess is at least one of the land portions arranged in the tire width direction, and a plurality of the recesses are provided along the extending direction of the lug grooves on the side walls facing the tire circumferential direction of the land portions, The pneumatic tire is characterized in that the concave portion provided in the side wall near the innermost side of the vehicle has a larger total volume, and the concave portion provided in the side wall near the outermost side of the vehicle has a smaller total volume. In a pneumatic tire provided with a plurality of land portions by designating a direction inside and outside the vehicle at the time of vehicle mounting and forming a plurality of grooves on the tread surface,
The land portion is formed in a block shape by a plurality of main grooves extending in the tire circumferential direction and arranged in the tire width direction, and lug grooves intersecting the main grooves,
A plurality of the recesses are provided along the extending direction of the main groove with respect to at least two of the plurality of side walls facing the tire width direction of the land portions arranged in the tire width direction, and are close to the vehicle innermost side. The concave portion provided on the side wall has a larger total volume, and the concave portion provided on the side wall near the vehicle outermost side has a smaller total volume,
And the said recessed part is provided with two or more along the extension direction of the said lug groove with respect to each side wall which is at least 2 of each said land part arranged in a tire width direction, and faces the tire circumferential direction of the said land part. The pneumatic tire is characterized in that the concave portion provided on the side wall near the innermost side of the vehicle has a larger total volume, and the concave portion provided on the side wall near the outermost side of the vehicle has a smaller total volume. About the concave portion provided on the side wall of the land portion facing the tire width direction,
The total volume Vout of the recess in the side wall that is the outermost side of the vehicle provided with the recess, and the total volume Vin of the recess in the side wall that is the innermost side of the vehicle provided with the recess is 1.5 ≦ Vin The pneumatic tire according to claim 1, wherein the pneumatic tire satisfies a range of / Vout ≦ 80. About the concave portion provided on each side wall facing the tire circumferential direction of the land portion,
The total volume Vout ′ of the concave portion in the land portion where the concave portion is provided and which is the outermost side of the vehicle, and the total volume Vin ′ of the concave portion in the land portion where the concave portion is provided and which is the innermost side of the vehicle are 1 The pneumatic tire according to claim 3, wherein the tire satisfies a range of 0.5 ≦ Vin ′ / Vout ′ ≦ 80. About the concave portion provided on the side wall of the land portion facing the tire width direction,
In the sidewall provided with the recess, the tire circumferential length Ld excluding the recess and the total tire circumferential length Lw satisfy a range of 0.05 ≦ Ld / Lw ≦ 0.70. The pneumatic tire according to any one of claims 1, 2, 4, and 5. About the concave portion provided on the side wall of the land portion facing the tire circumferential direction,
In the side wall provided with the recess, the tire width direction length Ld ′ excluding the recess and the total tire width direction length Lw ′ are within a range of 0.05 ≦ Ld ′ / Lw ′ ≦ 0.70. The pneumatic tire according to claim 3, wherein the pneumatic tire is satisfied.   The distance D1 from the groove bottom of the groove forming the side wall provided with the recess to the center position in the tire radial direction of the recess and the groove depth D of the groove are 0.10 ≦ D1 / D ≦ 0. The pneumatic tire according to claim 1, wherein the pneumatic tire satisfies a range of 60.

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