JP5346688B2 - tire - Google Patents

Description

  The present invention relates to a tire including a rib-like land portion partitioned by a circumferential groove extending along the tire circumferential direction, and more particularly to a tire provided with a resonator such as a Helmholtz resonator in the rib-like land portion.

  In recent years, demand for reducing tire noise has increased in passenger cars, etc., due to further progress in reducing vehicle noise (wind noise, mechanical noise, etc.) and further consideration for the environment. ing.

  Of the tire noise, in order to reduce air columnar resonance noise caused by the space formed by the circumferential groove extending along the tire circumferential direction and the road surface, a constant space is formed by the tread coming into contact with the road surface. A tire is known in which a Helmholtz resonator having an air chamber portion and a narrowed groove portion communicating with the air chamber portion and the circumferential groove is provided in a rib-like land portion extending along the tire circumferential direction (for example, a patent) Reference 1).

JP 2008-179289 A (page 4-5, FIG. 3)

  However, the conventional tire described above has the following problems. In other words, in order to further reduce tire noise such as air column resonance noise, if many resonators such as Helmholtz resonators are provided in the rib-like land portion, the rigidity of the rib-like land portion around the resonator is reduced, There were problems that adversely affected the vehicle's maneuverability and the wear resistance of the rib-like land.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tire that further reduces tire noise such as air column resonance noise while ensuring the maneuverability of the vehicle and the wear resistance of the rib-like land portion.

  In order to solve the above-described problems, the present invention has the following features. First, the first feature of the present invention includes a rib-like land portion (rib-like land portion 300) partitioned by circumferential grooves (circumferential grooves 12, 21) extending along the tire circumferential direction, and the rib Resonator (resonator 320) which is recessed toward the inner side in the tire radial direction in the shape of the land, and that the rib-like land is in contact with the road surface to form a predetermined space and only one end of the predetermined space is opened. In which the resonator has an air chamber portion (air chamber portion 321) that is recessed toward the inside in the tire radial direction and forms the air chamber portion. The shape of the wall portion is asymmetric, and the gist of the gap between the pair of wall portions becomes narrower in the tire radial direction inside in the cross section along the tread width direction and the tire radial direction. .

  According to the first feature of the present invention, since the interval between the wall portions of the air chamber portion of the resonator becomes narrower toward the inner side in the tire radial direction, the rigidity of the wall portion of the resonator can be improved. it can. Thus, even if a resonator is formed in the rib-like land portion, the rigidity of the rib-like land portion does not decrease, so that it is possible to ensure the maneuverability of the vehicle and the wear resistance of the tire. Further, even if a resonator is formed in the rib-like land portion, the rigidity does not decrease, so that more resonators can be arranged in the rib-like land portion. Accordingly, tire noise such as air column resonance can be further reduced.

  A second feature of the present invention relates to the first feature of the present invention, wherein at least one of the wall portions is linear in a cross section along the tread width direction and the tire radial direction, and the other wall portion is The gist of the invention is that it has a convex shape toward one of the wall portions in the cross section along the tread width direction and the tire radial direction.

  A third feature of the present invention relates to the first feature of the present invention, wherein at least one of the wall portions is linear in a cross section along the tread width direction and the tire radial direction, and the other wall portion is The gist is that it is stepped in the cross section along the tread width direction and the tire radial direction.

  A fourth feature of the present invention relates to any one of the first to third features of the present invention, wherein the resonator includes the air chamber portion, a narrowed groove portion communicating with the air chamber portion and the circumferential groove. The gist is that the resonator is a Helmholtz resonator including the constricted groove 112 and the constricted grooves 122A and 122B.

  The fifth feature of the present invention includes a rib-like land portion (rib-like land portion 100) defined by circumferential grooves (circumferential grooves 11 and 12) extending along the tire circumferential direction, and the tire radial inner side. A first resonator (resonator 110) in which only one end of the predetermined space is opened while the rib-like land portion is in contact with the road surface and the rib-like land portion is in contact with the road surface, and the tire radial inner side A second resonator (resonator 120A, resonator 120B) having a predetermined space formed by the rib-shaped land portion being in contact with the road surface and having only one end of the predetermined space opened. A tire (pneumatic tire 10) provided on the rib-like land portion, wherein the first resonator is adjacent to the second resonator in a tread width direction, the first resonator, and the second resonator. Between the resonator and the tire A circumferential wall portion (circumferential wall 180) extending along the direction is provided, and the thickness of the circumferential wall portion increases inward in the tire radial direction in the cross section along the tread width direction and the tire radial direction. The gist is that it is thick.

  According to the fifth feature of the present invention, since the thickness of the circumferential wall portion becomes thicker toward the inner side in the tire radial direction, the rigidity of the rib-like land portion around the resonator can be improved. Thereby, the controllability of the vehicle and the wear resistance of the tire can be ensured.

  The first resonator is adjacent to the second resonator in the tread width direction. Therefore, many resonators can be arranged in a limited space in the rib-like land portion. Accordingly, tire noise such as air column resonance can be further reduced.

  A sixth feature of the present invention relates to the fifth feature of the present invention, wherein the first resonator and the second resonator are each an air chamber portion (air chamber portion 111, The gist is that the Helmholtz resonator includes an air chamber portion 121A, 121B) and a narrowed groove portion (the narrowed groove portion 112, the narrowed groove portions 122A, 122B) communicating with the air chamber portion and the circumferential groove.

  A seventh feature of the present invention relates to the fifth or sixth feature of the present invention, wherein the circumferential wall portion has an adjacent portion adjacent to the narrowed groove portion, and the thickness of the adjacent portion is a tread width. The gist is that, in the cross section along the direction and the tire radial direction, the thickness increases as it goes inward in the tire radial direction.

  According to the seventh aspect of the present invention, in the resonator, it is possible to effectively reinforce a portion where rigidity is particularly likely to decrease. Thereby, block missing can be prevented and the function of the resonator can be maintained.

  An eighth feature of the present invention relates to any one of the fifth to seventh features of the present invention, wherein the circumferential wall is tapered in a cross section along the tread width direction and the tire radial direction. Is the gist.

  According to the characteristics of the present invention, it is possible to provide a tire in which tire noise such as air column resonance noise is further reduced while ensuring the maneuverability of the vehicle and the wear resistance of the rib-like land portion.

FIG. 1 is a partial perspective view of a pneumatic tire 10 according to an embodiment of the present invention. FIG. 2 is a partial front view of the pneumatic tire 10 according to the embodiment of the present invention. FIG. 3 is an enlarged view for explaining the shape of the rib-like land portion according to the embodiment of the present invention. FIG. 4 is an enlarged perspective view of a part of the ground contact surface G of the pneumatic tire 10 according to the embodiment of the present invention. Fig.5 (a) is sectional drawing in the aa line | wire of FIG. FIGS. 5B and 5C are diagrams for explaining a modification of the circumferential wall. FIG. 6 is an enlarged perspective view of a part of the ground contact surface G for explaining the shapes of the air chamber portion 111 and the narrowed groove portion 112. FIG. 7A is a cross-sectional view taken along line xx of FIG. FIG. 7B is a cross-sectional view taken along line yy of FIG. FIG. 8 is an enlarged view of a part of the ground contact surface G shown in FIG. FIG. 9 is an enlarged view for explaining the resonator 320 formed in the rib-like land portion 300 shown in FIG. FIG. 10A is a cross-sectional view taken along line bb in FIG. FIG. 10B is a view for explaining a modification of the wall portion 312a and the wall portion 311a forming the air chamber portion 321. 11 is a cross-sectional view taken along line cc of FIG. FIG. 12 is a view for explaining the arrangement positions of resonators according to other embodiments of the present invention. 13 is a cross-sectional view taken along line F2-F2 of FIG. FIG. 14 is a diagram showing a contact surface G with the road surface of the pneumatic tire 10A of FIG.

  Next, an embodiment of a tire according to the present invention will be described with reference to the drawings. Specifically, (1) the overall schematic configuration of the tire, (2) the shape of the rib-like land portion, (3) actions and effects, and (4) other embodiments will be described.

  In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. In addition, there may be a case where the dimensional relationships and ratios are different between the drawings.

(1) Overall Schematic Configuration of Tire FIG. 1 is a partial perspective view of a pneumatic tire 10 according to this embodiment. FIG. 2 is a partial front view of the pneumatic tire 10.

  A plurality of circumferential grooves are formed in the pneumatic tire 10. The pneumatic tire 10 is provided with a plurality of rib-like land portions that are partitioned by the circumferential groove and extend along the tire circumferential direction (direction D1 in FIG. 1). The pneumatic tire 10 is a tire that is designed to reduce tire noise such as air columnar resonance and is mounted on a passenger car or the like that requires high silence. The pneumatic tire 10 may be filled with an inert gas such as nitrogen gas instead of air. A region indicated by a dotted line in FIG. 2 represents a contact surface G where the pneumatic tire 10 contacts the road surface in a state where a normal load is applied.

  Specifically, circumferential grooves 11, 12, 21 and 22 are formed in the pneumatic tire 10. The circumferential grooves 11, 12, 21, and 22 extend along the tire circumferential direction.

  A rib-like land portion 100 is formed between the circumferential groove 11 and the circumferential groove 12. A rib-like land portion 300 is formed between the circumferential groove 12 and the circumferential groove 21. A shoulder land portion 400 is formed on the outer side in the tread width direction than the circumferential groove 22.

(2) Shape of rib-shaped land portion The shape of the rib-shaped land portion will be described with reference to FIG. Specifically, the shape of the rib-like land portion 100 will be described. The rib-like land portion 100 includes a resonator 110, a resonator 120A, and a resonator 120B.

  The resonator 110 is recessed toward the inside in the tire radial direction. The resonator 110 forms a predetermined space when the rib-shaped land portion 100 contacts the road surface, and only one end of the predetermined space is opened.

  The resonator 120A and the resonator 120B are located on the outer side (Wout) in the tread width direction than the resonator 110, and are recessed toward the inner side in the tire radial direction. The resonator 120A and the resonator 120B form a predetermined space when the rib-like land portion 100 is in contact with the road surface, and only one end of the predetermined sky k is opened.

  In the present embodiment, the resonator 120A and the resonator 120B are located outside the resonator 110 in the tread width direction (Wout) and outside when the vehicle is mounted. That is, the resonator 110 is located on the inner side (Win) in the tread width direction than the resonator 120A and the resonator 120B, and on the inner side when the vehicle is mounted.

  In the present embodiment, the number of resonators 120 </ b> A and resonators 120 </ b> B is larger than the number of resonators 110. In a state where a normal load is applied to the pneumatic tire 10, the number of resonators 120 </ b> A and resonators 120 </ b> B located in the ground contact surface G is larger than the number of resonators 110. In the present embodiment, the resonator 110 constitutes a first resonator, and the resonator 120A and the resonator 120B constitute a second resonator.

  The resonator 110 is a Helmholtz resonator including an air chamber portion 111 that is recessed toward the inside in the tire radial direction, and a narrowed groove portion 112 that communicates with the air chamber portion 111 and the circumferential groove 12. The narrowed groove 112 is formed at the same position as the air chamber 111 in the tire circumferential direction. That is, the narrowed groove portion 112 and the air chamber portion 111 are arranged in a letter shape. The volume of the narrowed groove 112 is smaller than the volume of the air chamber 111.

  The resonator 120 </ b> A is a Helmholtz resonator including an air chamber portion 121 </ b> A that is recessed toward the inside in the tire radial direction and a narrowed groove portion 122 </ b> A that communicates with the air chamber portion 121 </ b> A and the circumferential groove 11. The narrowed groove 122A is formed at the same position as the air chamber 121A in the tire circumferential direction. That is, the narrowed groove 122A and the air chamber 121A are arranged in a letter shape. The volume of the narrowed groove 122A is smaller than the volume of the air chamber 121A.

  The resonator 120 </ b> B is a Helmholtz resonator including an air chamber 121 </ b> B that is recessed toward the inside in the tire radial direction and a narrowed groove 122 </ b> B that communicates with the air chamber 121 </ b> B and the circumferential groove 11. The narrowed groove 122B is formed at the same position as the air chamber 121B in the tire circumferential direction. That is, the narrowed groove 122B and the air chamber 121B are arranged in a letter shape. The volume of the narrowed groove 122B is smaller than the volume of the air chamber 121B.

  A circumferential wall 180 extending along the tire circumferential direction is provided between the resonator 110 and the resonator 120A and between the resonator 110 and the resonator 120B.

  FIG. 4 is an enlarged perspective view of a part of the ground contact surface G for explaining the shapes of the rib-like land portion 100 and the rib-like land portion 300. As shown in FIG. 4, the rib-shaped land portion 100 includes a land portion 113 and a land portion 123. In a state where a normal load is applied to the pneumatic tire 10, the air chamber portion 111 is formed by the land portion 113 and the circumferential wall 180. In addition, in a state where a normal load is applied to the pneumatic tire 10, the air chamber portion 121 </ b> A and the air chamber portion 121 </ b> B are formed by the land portion 123 and the circumferential wall 180.

  Fig.5 (a) is sectional drawing in the aa line | wire of FIG. A side wall 181 that is one side surface of the circumferential wall 180 forms a side wall of the resonator 110. Further, the side wall 182 which is the other side surface of the circumferential wall 180 forms a side wall of the resonator 120B. The thickness d of the circumferential wall 180 increases in the tire radial direction inside in the cross section along the tread width direction and the tire radial direction. For example, the circumferential wall 180 is tapered in a cross section along the tread width direction and the tire radial direction.

  FIG. 5B is a diagram illustrating a modification of the circumferential wall. It is sectional drawing in the aa line | wire of FIG. 4 similarly to Fig.5 (a). The thickness of the circumferential wall 180a which is a modified example becomes thicker as it goes inward in the tire radial direction in the cross section along the tread width direction and the tire radial direction. In the cross section along the tread width direction and the tire radial direction, the side walls 181a and 182a are formed in a straight line.

  FIG.5 (c) is a figure explaining the modification of the circumferential direction wall. It is sectional drawing in the aa line | wire of FIG. 4 similarly to Fig.5 (a). The thickness of the circumferential wall 180b, which is a modified example, becomes thicker toward the inner side in the tire radial direction in the cross section along the tread width direction and the tire radial direction. In the cross section along the tread width direction and the tire radial direction, the side walls 181b and 182b are formed in a step shape.

  FIG. 6 is an enlarged perspective view of a part of the ground contact surface G for explaining the shapes of the air chamber portion 111 and the narrowed groove portion 112. FIG. 7A is a cross-sectional view taken along line xx of FIG. The shape of the pair of wall portions forming the air chamber portion 111 is asymmetric. The distance d2 between the pair of wall portions (the distance between the end portion 113a of the land portion 113 and the side wall 181 of the circumferential wall 180) d2 increases inward in the tire radial direction in the cross section along the tread width direction and the tire radial direction. It is narrow. The thickness d of the side wall 181 of the circumferential wall 180, which is an adjacent portion adjacent to the narrowed groove portion 112, becomes thicker toward the inner side in the tire radial direction in the cross section along the tread width direction and the tire radial direction.

  FIG. 7B is a cross-sectional view taken along line yy of FIG. The interval between the wall portions forming the narrowed groove portion 112 (the distance between the end portion 113a of one land portion 113 adjacent to the narrowed groove portion 112 and the end portion 113a of the other land portion 113) d3 is the tire circumferential direction and the tire diameter. It is constant in the cross section along the direction.

  FIG. 8 is an enlarged view of a part of the ground contact surface G shown in FIG. The shape of the resonator 110, the resonator 120A, and the resonator 120B in the tread surface view will be described with reference to FIG.

  The length L1 along the tire circumferential direction of the resonator 110 is longer than the length L2 along the tire circumferential direction of the resonator 120A. The length L1 along the tire circumferential direction of the resonator 110 is longer than the length L3 along the tire circumferential direction of the resonator 120B.

  The narrow groove portion 112 of the resonator 110 is inclined with respect to the tire circumferential direction in the tread surface view. The narrowed groove 122A of the resonator 120A is inclined with respect to the tire circumferential direction in the tread surface view. The narrowed groove 122B of the resonator 120B is inclined with respect to the tire circumferential direction in the tread surface view.

  The narrowed groove portion 112 communicates with the air chamber portion 111 at an end portion 111e of the air chamber portion 111 in the tire circumferential direction. The narrowed groove 122A communicates with the air chamber 121A at the end 121Ae of the air chamber 121A in the tire circumferential direction. The narrowed groove 122B communicates with the air chamber 121B at the end 121Be in the tire circumferential direction of the air chamber 121B. The narrowed groove portion 112, the narrowed groove portion 122A, and the narrowed groove portion 122B communicate with the air chamber portion 111, the air chamber portion 121A, and the air chamber portion 121B at an acute angle. That is, the narrowed groove 112, the narrowed groove 122A, and the narrowed groove 122B are formed at the same position as the air chamber 111, the air chamber 121A, and the air chamber 121B in the tire circumferential direction.

  An angle θ1 with respect to the tire circumferential direction of the narrowed groove portion 112 constituting the resonator 110 is substantially the same as an angle θ2 with respect to the tire circumferential direction of the narrowed groove portion 122A constituting the resonator 120A in a tread surface view.

  The constricted groove portion 112 constituting the resonator 110 defined by the circumferential wall 180 and the constricted groove portion 122A constituting the resonator 120A located on the opposite side of the resonator 110 with respect to the circumferential wall 180 are the tire circumferential direction. Are formed at different positions.

  Similarly, the constriction groove portion 112 constituting the resonator 110 defined by the circumferential wall 180 and the constriction groove portion 122B constituting the resonator 120B located on the opposite side of the resonator 110 with respect to the circumferential wall 180 are as follows: They are formed at different positions in the tire circumferential direction.

  FIG. 9 is an enlarged view for explaining the resonator 320 formed in the rib-like land portion 300 shown in FIG. Specifically, the rib-like land portion 300 is partitioned by circumferential grooves 12 and 21 extending along the tire circumferential direction. The rib-shaped land portion 300 includes a land portion 311 and a land portion 312.

  The rib-shaped land portion 300 is formed with a resonator 320 that is recessed toward the inside in the tire radial direction and forms a predetermined space when the land portion 311 and the land portion 312 of the rib-shaped land portion 300 are in contact with the road surface. The

  FIG. 10A is a cross-sectional view taken along line bb in FIG. The resonator 320 is a Helmholtz resonator including an air chamber portion 321 that is recessed toward the inside in the tire radial direction, and a narrowed groove portion 322 that communicates with the air chamber portion 321 and the circumferential groove 21. The narrowed groove 322 is open at both ends of a predetermined space. The volume of the narrowed groove portion 322 is smaller than the volume of the air chamber portion 321.

  The distance dW between the wall 312a and the wall 311a forming the air chamber portion 321 is narrower toward the inner side in the tire radial direction in the cross section along the tread width direction and the tire radial direction. One wall 311a is linear in the cross section along the tread width direction and the tire radial direction, and the wall 312a is convex toward the wall 311a in the cross section along the tread width direction and the tire radial direction. is there.

  FIG. 10B is a view for explaining a modification of the wall portion 312a and the wall portion 311a forming the air chamber portion 321. It is sectional drawing in the bb line of FIG. 4 similarly to Fig.10 (a). The interval between the wall portion 312a 'and the wall portion 311a', which is a modified example, becomes narrower toward the inner side in the tire radial direction in the cross section along the tread width direction and the tire radial direction. One wall 311a 'is linear in the cross section along the tread width direction and the tire radial direction, and the wall 312a' is stepped in the cross section along the tread width direction and the tire radial direction.

  11 is a cross-sectional view taken along line cc of FIG. The end portion 312a of the land portion 312 is formed such that the thickness in the tire radial direction becomes thinner as it approaches the narrowed groove portion 322 in the cross section along the tire circumferential direction and the tire radial direction.

(3) Action / Effect According to the pneumatic tire 10, the resonator 320 has the air chamber portion 321 recessed toward the inner side in the tire radial direction, and the interval between the wall portions forming the air chamber portion 321 is tread. In the cross section along the width direction and the tire radial direction, it becomes narrower toward the inner side in the tire radial direction. That is, since the wall portion is built up, the rigidity of the wall portion of the resonator 320 can be improved. Thus, even if the resonator 320 is formed in the rib-shaped land portion, the rigidity of the rib-shaped land portion does not decrease, so that it is possible to ensure the vehicle maneuverability and the tire wear resistance. Further, even if a resonator is formed in the rib-like land portion, the rigidity does not decrease, so that more resonators can be arranged in the rib-like land portion. Accordingly, tire noise such as air column resonance can be further reduced.

  In the pneumatic tire 10, a circumferential wall 180 extending along the tire circumferential direction is provided between the resonator 110 and the resonators 120A and 120B. The thickness of the circumferential wall 180 is determined by the tread width. The cross section along the direction and the tire radial direction becomes thicker toward the inner side in the tire radial direction. Therefore, the rigidity of the rib-like land portion around the resonator 110, the resonator 120A, and the resonator 120B can be improved. Thereby, the controllability of the vehicle and the wear resistance of the tire can be ensured.

  The resonator 110 is adjacent to the resonator 120A and the resonator 120B in the tread width direction. Therefore, many resonators can be arranged in a limited space in the rib-like land portion. Accordingly, tire noise such as air column resonance can be further reduced.

  The distance d2 between the pair of wall portions forming the air chamber portion 111 becomes narrower toward the inner side in the tire radial direction in the cross section along the tread width direction and the tire radial direction. The thickness of the side wall 181 of the circumferential wall 180, which is an adjacent portion adjacent to the narrowed groove portion 112, becomes thicker toward the inner side in the tire radial direction in the cross section along the tread width direction and the tire radial direction. Therefore, in the resonator, it is possible to effectively reinforce a portion where the rigidity is likely to decrease. Thereby, block missing can be prevented and the function of the resonator can be maintained.

(4) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments and examples will be apparent to those skilled in the art. For example, the embodiment of the present invention can be modified as follows.

  In the pneumatic tire 10, the case where the resonator 110, the resonator 120A, and the resonator 120B are formed in the rib-like land portion 100 and the rib-like land portion 300 has been described. However, the resonator may be formed on all land portions.

  In the pneumatic tire 10A shown in FIG. 12, a resonator is provided in each of the plurality of rib-like land portions. FIG. 13 is a cross-sectional view taken along the line F2-F2 of the pneumatic tire 10A. FIG. 14 is a diagram illustrating the ground contact surface G of the pneumatic tire 10A.

  The pneumatic tire 10A has circumferential grooves 11A, 12A, 21A, and 22A. A rib-like land portion 100A is formed between the circumferential groove 11A and the circumferential groove 12A. A rib-like land portion 200A is formed between the circumferential groove 12A and the circumferential groove 21A. A shoulder land portion 300A is formed on the outer side in the tread width direction than the circumferential groove 22A.

  The pneumatic tire 10A includes a rib-shaped land portion 100A and a rib-shaped land portion 200A that is separate from the rib-shaped land portion 100A and is located outside the rib-shaped land portion 100A in the tread width direction. The rib-like land portion 100A is provided with a resonator 110A (first resonator), and the rib-like land portion 100A is provided with a resonator 210A (second resonator). The pneumatic tire 10A has a rib-like land portion 300A (shoulder land portion), and the resonator 310A is also formed in the rib-like land portion 300A.

  Resonator 210A is located outside of resonator 110A when the vehicle is mounted. The resonator 310A is located on the inner side than the resonator 110A when the vehicle is mounted. That is, the resonator 310A has the same configuration as the resonator 110A and the resonator 210A.

  In the present embodiment, in the ground plane G, the number of resonators 210A and resonators 310A is larger than the number of resonators 110A. Further, the number of resonators 310A is larger than the number of resonators 210A.

  In the present embodiment, the rib-like land portion 200A is located outside the rib-like land portion 100A in the tread width direction (outside when the vehicle is mounted).

  As described above, according to the pneumatic tire 10A, when a plurality of rib-like land portions are formed on the tire, by forming a resonator for each rib-like land portion, air column resonance for each rib-like land portion is formed. Sound can be effectively suppressed.

  In the embodiment described above, the circumferential grooves 11, 12, 21, and 22 extend linearly along the tire circumferential direction. However, if the circumferential grooves extend along the tire circumferential direction, they are not necessarily straight. The shape is not limited to a zigzag shape and a wave shape.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  DESCRIPTION OF SYMBOLS 10 ... Tire, 10A ... Tire, 11, 12, 21, 22 ... Circumferential groove | channel, 100 ... Rib-like land part, 100A ... Rib-like land part, 110 ... Resonator, 110A ... Resonator, 111 ... Air chamber part, 111e ... end portion, 112 ... narrowed groove portion, 113 ... land portion, 113a ... end portion, 120A ... resonator, 120A, 120B ... resonator, 120B ... resonator, 121A, 121B ... air chamber portion, 121Ae ... end portion, 121Be ... end, 122A, 122B ... narrowed groove part, 123 ... land part, 180 ... circumferential wall, 180a ... circumferential wall, 180b ... circumferential wall, 181 ... side wall, 181a, 181b ... side wall, 182 ... side wall, 200A ... rib-shaped land portion 210A ... resonator, 300 ... rib-like land portion, 311 ... land portion, 311a ... wall portion, 312 ... land portion, 312a ... wall portion, 12a ... end, 320 ... resonator, 32 ... air chamber section, 322 ... narrowing groove 400 ... shoulder land portion

Claims (8)

Having a rib-like land portion defined by circumferential grooves extending along the tire circumferential direction;
The rib-shaped land portion is recessed toward the inner side in the tire radial direction, and the rib-shaped land portion is in contact with the road surface to form a predetermined space, and a resonator is provided that opens only one end of the predetermined space. Tires,
The resonator has an air chamber portion recessed toward the inside in the tire radial direction,
The shape of the pair of wall portions forming the air chamber portion is asymmetric,
The tire in which the distance between the pair of wall portions becomes narrower toward the inner side in the tire radial direction in a cross section in the tread width direction along the tread width direction and the tire radial direction. At least one of the wall portions is linear in the tread width direction cross section along the tread width direction and the tire radial direction,
The tire according to claim 1, wherein the other wall portion has a convex shape toward the one wall portion in a tread width direction cross section along the tread width direction and the tire radial direction. At least one of the wall portions is linear in the tread width direction cross section along the tread width direction and the tire radial direction,
The tire according to claim 1, wherein the other wall portion has a step shape in a cross section in the tread width direction along the tread width direction and the tire radial direction. The resonator is
The tire according to any one of claims 1 to 3, wherein the tire is a Helmholtz resonator including the air chamber portion and a narrowed groove portion communicating with the air chamber portion and the circumferential groove. Having a rib-like land portion defined by circumferential grooves extending along the tire circumferential direction;
A first resonator that is recessed toward the inside in the tire radial direction, and that the rib-shaped land portion is in contact with the road surface to form a predetermined space, and only one end of the predetermined space is opened;
The rib-shaped land portion is recessed toward the inside in the tire radial direction, and the rib-shaped land portion is in contact with the road surface to form a predetermined space, and a second resonator in which only one end of the predetermined space is opened. The tire provided in the
The first resonator is adjacent to the second resonator in the tread width direction,
Between the first resonator and the second resonator, a circumferential wall portion extending along the tire circumferential direction is provided,
The tire in which the thickness of the circumferential wall portion becomes thicker toward the inner side in the tire radial direction in a cross section in the tread width direction along the tread width direction and the tire radial direction. The first resonator and the second resonator are:
An air chamber that is recessed toward the inside in the tire radial direction;
The tire according to claim 5, wherein the tire is a Helmholtz resonator including the air chamber portion and a narrowed groove portion communicating with the circumferential groove. The circumferential wall portion has an adjacent portion adjacent to the narrowed groove portion,
The tire according to claim 5 or 6, wherein the thickness of the adjacent portion becomes thicker toward the inner side in the tire radial direction in a cross section in the tread width direction along the tread width direction and the tire radial direction. The tire according to any one of claims 5 to 7, wherein the circumferential wall portion is tapered in a tread width direction cross section along a tread width direction and a tire radial direction.

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