Tire tread structure

Abstract

The utility model provides a tire tread structure. Longitudinal grooves of the tire tread structure extend in the circumferential direction of a tire, the multiple longitudinal grooves are formed in the width direction of the tire at intervals, the arc length TAW of the tire tread, and the width W1 of a first longitudinal groove, the width W2 of a second longitudinal groove, the width W3 of a third longitudinal groove, the width W4 of a fourth longitudinal groove and the arc length TAW meet the conditions that W1 is larger than or equal to 0.052 TAW and smaller than or equal to 0.072 TAW, W2 is larger than or equal to 0.061 TAW and smaller than or equal to 0.081 TAW, and W3 is larger than or equal to 0.059 TAW and smaller than or equal to 0.079 TAW. W4 is greater than or equal to 0.026 TAW and less than or equal to 0.046 TAW; wherein the groove bottom of the first longitudinal groove and / or the groove bottom of the second longitudinal groove are / is provided with a protrusion, and the protrusion is provided with a first concave part. The tire tread structure effectively solves the problem that a tire tread structure of an electric automobile tire in the prior art cannot give consideration to the control performance and the driving noise at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of tires, in particular to a tire tread structure. Background Art

[0002] With the development of the automotive industry, the market share of electric vehicles continues to increase. Since the weight of electric vehicles is higher than that of ordinary fuel vehicles, the requirements for the handling performance of electric vehicles have become higher. As the tire is the only part of the vehicle that contacts the ground, the requirements for its handling performance have also increased. At the same time, compared with ordinary fuel vehicles, the drive system of electric vehicles has reduced the internal combustion engine and part of the transmission system, which leads to a greater proportion of tire driving noise in the total driving noise of electric vehicles, and the requirements for tire driving noise have also increased accordingly.

[0003] However, the tread pattern structure of the tires used in electric vehicles in the prior art often continues the traditional design, which is unable to better improve the handling performance of the tires and reduce the driving noise of the tires. Utility Model Content

[0004] The main purpose of the utility model is to provide a tire tread structure to solve the problem that the tire tread structure of electric vehicle tires in the prior art cannot take into account both handling performance and driving noise.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a tire tread structure, including: a plurality of longitudinal grooves, each of which extends along the circumference of the tire, and the plurality of longitudinal grooves are arranged at intervals along the width direction of the tire, and include a first longitudinal groove, a second longitudinal groove, a third longitudinal groove and a fourth longitudinal groove arranged in sequence from the inner side of the tire to the outer side of the tire, the tread of the tire has an arc length TAW, and the width W1 of the first longitudinal groove, the width W2 of the second longitudinal groove, the width W3 of the third longitudinal groove, the width W4 of the fourth longitudinal groove and the arc length TAW satisfy: 0.052TAW≤W1≤0.072TAW, 0.061TAW≤W2≤0.081TAW, 0.059TAW≤W3≤0.079TAW, 0.026TAW≤W4≤0.046TAW; wherein, a protrusion is provided on the groove bottom of the first longitudinal groove and / or the groove bottom of the second longitudinal groove, and a first recess is provided on the protrusion.

[0006] Furthermore, the bottom of the longitudinal groove is an arc-shaped surface, and along the radial direction of the tire, the arc-shaped surface protrudes toward a side away from the tire to form a convex portion; the height H1 of the convex portion satisfies: 0.2mm≤H1≤0.3mm.

[0007] Furthermore, the plurality of longitudinal grooves separate the tread into a shoulder pattern portion and an intermediate pattern portion located between the two shoulder pattern portions, the shoulder pattern portion close to the inner side of the tire is the inner shoulder pattern portion, and the tire tread structure further includes: a second recessed portion, which is arranged on the inner shoulder pattern portion, and the extension direction of the second recessed portion is arranged at a first angle A1 with the width direction of the tire, and the first angle A1 satisfies: 6°≤A1<10°; a third recessed portion, which is arranged on the inner shoulder pattern portion, and one end of the third recessed portion is connected to the longitudinal groove, and the other end of the third recessed portion is connected to the width direction of the tire. There is a preset distance between the shoulders, and the extension direction of the third recess is set at a second angle A2 with the width direction of the tire, and the second angle A2 satisfies: 6°≤A2<10°; there are multiple second recesses, and there are multiple third recesses, and the multiple second recesses are spaced along the circumference of the tire, and at least one third recess is set between two adjacent second recesses; wherein, the width of the second recess is W5, the width of the third recess is W6, and the width W5 and the width W6 satisfy: 2.2mm≤W5≤3.5mm, 2.2mm≤W6≤3.5mm.

[0008] Furthermore, the shoulder pattern portion close to the outer side of the tire is the outer shoulder pattern portion, and the tire tread structure also includes: a fourth recess, which is arranged on the outer shoulder pattern portion, and the extension direction of the fourth recess is arranged at a third angle A3 with the width direction of the tire, and the third angle A3 satisfies: 4°≤A3<8°; the width of the fourth recess is W7, and the width W7 satisfies: 2.2mm≤W7≤3.5mm; wherein, the first angle A1, the second angle A2 and the third angle A3 satisfy: 1°≤A1-A3≤3°, 1°≤A1-A3≤3°.

[0009] Further, the multiple intermediate pattern portions include an inner crown pattern portion and a center pattern portion, at least part of the center pattern portion coincides with the center plane S of the tire, the inner crown pattern portion is located on the side of the center pattern portion close to the inner side of the tire, and the tire tread structure also includes: a fifth recess, arranged on the inner crown pattern portion, the fifth recess includes a first sub-recess, a second sub-recess and a third sub-recess that are interconnected, the second sub-recess is located between the first sub-recess and the third sub-recess, and the ends of the first sub-recess and the third sub-recess away from each other are respectively connected to the longitudinal grooves located on both sides of the inner crown pattern portion; wherein, the extension direction of the first sub-recess is set at a fourth angle A4 with the width direction of the tire, and the extension direction of the third sub-recess is set at a fifth angle A5 with the width direction of the tire, and the fourth angle A4 and the fifth angle A5 satisfy: 32°≤A4≤38°, 22°≤A5≤28°; the width of the fifth recess is W8, and the width W8 satisfies: 0.4mm≤W8≤0.8mm.

[0010] Furthermore, the multiple intermediate pattern portions also include an outer crown pattern portion, which is located on the side of the central pattern portion away from the inner side of the tire, and the tire tread structure also includes: a sixth recess, arranged on the central pattern portion, for connecting the longitudinal grooves located on both sides of the central pattern portion; a seventh recess, arranged on the outer crown pattern portion, for connecting the longitudinal grooves located on both sides of the outer crown pattern portion; the width W9 of the sixth recess and the width W10 of the seventh recess satisfy: 0.4mm≤W9≤0.8mm, 0.4mm≤W10≤0.8mm; the extension direction of the sixth recess is set at a sixth angle A6 with the width direction of the tire, and the extension direction of the seventh recess is set at a seventh angle A7 with the width direction of the tire, and the sixth angle A6 and the seventh angle A7 satisfy: 13°≤A6≤19°, 13°≤A7≤19°.

[0011] Further, the plurality of second recesses divide the inner shoulder pattern portion into a plurality of inner shoulder pattern blocks, and the inner shoulder pattern block and a second recess adjacent thereto form a pattern group; and / or, there are a plurality of fourth recesses, and the plurality of fourth recesses are spaced apart along the circumferential direction of the tire to divide the outer shoulder pattern portion into a plurality of outer shoulder pattern blocks, and the outer shoulder pattern block and a fourth recess adjacent thereto form a pattern group; and / or, there are a plurality of fifth recesses, and the plurality of fifth recesses are spaced apart along the circumferential direction of the tire to divide the inner crown pattern portion into a plurality of inner crown pattern blocks, and the inner crown pattern block and a fifth recess adjacent thereto form a pattern group; and / or, there are a plurality of sixth recesses, and the plurality of sixth recesses are spaced apart along the circumferential direction of the tire to divide the center pattern portion into a plurality of A central pattern block, a pattern group is formed between the central pattern block and a sixth recess adjacent thereto; and / or, there are multiple seventh recesses, the multiple seventh recesses are spaced apart along the circumferential direction of the tire, and the outer crown pattern part is divided into multiple outer crown pattern blocks, and a pattern group is formed between the outer crown pattern block and a seventh recess adjacent thereto; wherein, there are multiple pattern groups, the multiple pattern groups include a first pattern group, a second pattern group, a third pattern group and a fourth pattern group, and the length P1 of the first pattern group, the length P2 of the second pattern group, the length P3 of the third pattern group and the length P4 of the fourth pattern group satisfy the following: 1.123P1≤P2≤1.183P1, 1.351P1≤P3≤1.411P1, 1.471P1≤P4≤1.531P1.

[0012] Furthermore, the arc length TAW and the nominal section width SN of the tire satisfy: 0.84SN≤TAW≤0.91SN; on the radial cross-section of the tire, the tread has an arc-shaped contour curve G, and the chord of the arc-shaped contour curve G has a maximum distance H2 from the arc-shaped contour curve G, and the maximum distance H2 and the arc length TAW satisfy: 0.042TAW≤H2≤0.048TAW; wherein, the arc-shaped contour curve G located on one side of the center plane S of the tire includes a first arc-shaped contour curve, a second arc-shaped contour curve and a third arc-shaped contour curve connected in sequence; the arc length CL1 of the first arc-shaped contour curve, the arc length CL2 of the second arc-shaped contour curve, the arc length CL3 of the third arc-shaped contour curve and the arc length TAW satisfy: 0.165TAW≤CL1≤0.180TAW, 0.165TAW≤CL2≤0.180TAW, 0.150TAW≤CL3≤0.175TAW.

[0013] Further, on the radial cross section of the tire, the first longitudinal groove, the second longitudinal groove, and the third longitudinal groove have a first intersection between the groove wall close to the outer side of the tire and the arcuate profile curve G, and the tangent of the arcuate profile curve G at the first intersection and the groove wall are set at an eighth angle A8; the first longitudinal groove, the second longitudinal groove, and the third longitudinal groove have a second intersection between the groove wall away from the outer side of the tire and the arcuate profile curve G, and the tangent of the arcuate profile curve G at the second intersection and the groove wall are set at a ninth angle A9, and the eighth angle A8 and the ninth angle A9 satisfy: 76°≤ A8≤80°, 73°≤A9≤77°; there is a third intersection between the groove wall of the fourth longitudinal groove close to the outer side of the tire and the arcuate contour curve G, and a tenth angle A10 is formed between the tangent of the arcuate contour curve G at the third intersection and the groove wall; there is a fourth intersection between the groove wall of the fourth longitudinal groove away from the outer side of the tire and the arcuate contour curve G, and a eleventh angle A11 is formed between the tangent of the arcuate contour curve G at the fourth intersection and the groove wall, and the tenth angle A10 and the eleventh angle A11 satisfy: 78°≤A10≤82°, 78°≤A11≤80°.

[0014] Furthermore, the projection of the contact surface between each intermediate tread portion and the running surface on the radial section of the tire is an arc line, and there is a maximum distance between the chord of the arc line and the arc line; wherein, the inner crown pattern portion has a maximum distance K1, and the maximum distance K1 satisfies: 0.23mm≤K1≤0.35mm, the center pattern portion has a maximum distance K2, and the maximum distance K2 satisfies: 0.23mm≤K2≤0.35mm, and the outer crown pattern portion has a maximum distance K3, and the maximum distance K3 satisfies: 0.23mm≤K3≤0.35mm; the maximum distance K1, the maximum distance K2 and the maximum distance K3 satisfy: H3<H2

[0015] ​By applying the technical solution of the utility model, the plurality of longitudinal grooves of the tire tread structure extend along the circumference of the tire, the plurality of longitudinal grooves are arranged at intervals along the width direction of the tire, and include a first longitudinal groove, a second longitudinal groove, a third longitudinal groove and a fourth longitudinal groove arranged in sequence from the inner side of the tire to the outer side of the tire, the tread of the tire has an arc length TAW, and the width W1 of the first longitudinal groove, the width W2 of the second longitudinal groove, the width W3 of the third longitudinal groove, the width W4 of the fourth longitudinal groove and the arc length TAW satisfy: 0.052TAW≤W1≤0.072TAW, 0.061TAW≤W2≤0.081TAW, 0.059TAW≤W3≤0.079TAW, 0.026TAW≤W4≤0.046TAW. Among them, a protrusion is provided on the groove bottom of the first longitudinal groove and / or the groove bottom of the second longitudinal groove, and a first recess is provided on the protrusion. In this way, the width settings of the first longitudinal groove, the second longitudinal groove, the third longitudinal groove and the fourth longitudinal groove ensure that the drainage area of ​​the tire is appropriate, thereby ensuring that the tire has a sufficiently large drainage capacity and improving the handling performance of the tire on slippery roads; on the other hand, since the width of the fourth longitudinal groove close to the outer side of the tire is the smallest, the ground contact rate of the tread close to the outer side of the tire is large, thereby improving the stability and safety of the tire when turning and driving in a straight line. At the same time, the protrusion with the first concave portion can disrupt the gas flow inside the groove, thereby improving the pumping noise during the tire driving process and reducing the driving noise of the tire, thereby solving the problem that the tire tread structure of the electric vehicle tire in the prior art cannot take into account both the handling performance and the driving noise, and improving the user's driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A partial front view of an embodiment of a tire tread structure according to the present utility model is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of a radial cross section of a tire tread structure;

[0019] Figure 3 Shows Figure 1 A schematic cross-sectional view of a pattern block of a tire tread structure;

[0020] Figure 4 Shows Figure 1 Schematic diagram of the cross-section of the longitudinal grooves of the tire tread structure.

[0021] The above drawings include the following reference numerals:

[0022] 10. longitudinal groove; 11. first longitudinal groove; 12. second longitudinal groove; 13. third longitudinal groove; 14. fourth longitudinal groove; 20. protrusion; 30. first recess; 40. protrusion; 50. inner shoulder tread portion; 51. inner shoulder tread block; 60. inner crown tread portion; 61. inner crown tread block; 70. center tread portion; 71. center tread block; 80. outer crown tread portion; 81. outer crown tread block; 90. outer shoulder tread portion; 91. outer shoulder tread block; 100. second recess; 110. third recess; 120. fourth recess; 130. fifth recess; 131. first sub-recess; 132. second sub-recess; 133. third sub-recess; 140. sixth recess; 150. seventh recess. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0025] In the present invention, unless otherwise specified, directional words such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0026] In order to solve the problem in the prior art that the tire tread structure of electric vehicle tires cannot take into account both handling performance and driving noise, the present application provides a tire tread structure.

[0027] like Figures 1 to 4As shown, the multiple longitudinal grooves 10 of the tire tread structure all extend along the circumference of the tire, and the multiple longitudinal grooves 10 are spaced apart along the width direction of the tire, and include a first longitudinal groove 11, a second longitudinal groove 12, a third longitudinal groove 13 and a fourth longitudinal groove 14 arranged in sequence from the inner side to the outer side of the tire, and the tread of the tire has an arc length TAW, and the width W1 of the first longitudinal groove 11, the width W2 of the second longitudinal groove 12, the width W3 of the third longitudinal groove 13, the width W4 of the fourth longitudinal groove 14 and the arc length TAW satisfy: 0.052TAW≤W1≤0.072TAW, 0.061TAW≤W2≤0.081TAW, 0.059TAW≤W3≤0.079TAW, 0.026TAW≤W4≤0.046TAW. A protrusion 20 is provided on the groove bottom of the first longitudinal groove 11 and / or the groove bottom of the second longitudinal groove 12 , and a first recess 30 is provided on the protrusion 20 .

[0028] By applying the technical solution of this embodiment, the multiple longitudinal grooves 10 of the tire tread structure all extend along the circumference of the tire, and the multiple longitudinal grooves 10 are spaced apart along the width direction of the tire, and include a first longitudinal groove 11, a second longitudinal groove 12, a third longitudinal groove 13 and a fourth longitudinal groove 14 arranged in sequence from the inner side to the outer side of the tire, and the tread of the tire has an arc length TAW, and the width W1 of the first longitudinal groove 11, the width W2 of the second longitudinal groove 12, the width W3 of the third longitudinal groove 13, the width W4 of the fourth longitudinal groove 14 and the arc length TAW satisfy: 0.052TAW≤W1≤0.072TAW, 0.061TAW≤W2≤0.081TAW, 0.059TAW≤W3≤0.079TAW, 0.026TAW≤W4≤0.046TAW. Among them, a protrusion 20 is arranged on the bottom of the first longitudinal groove 11 and / or the bottom of the second longitudinal groove 12, and a first recess 30 is arranged on the protrusion 20. In this way, the above-mentioned width setting of the first longitudinal groove 11, the second longitudinal groove 12, the third longitudinal groove 13 and the fourth longitudinal groove 14, on the one hand, ensures that the drainage area of ​​the tire is relatively appropriate, thereby ensuring that the tire has a sufficiently large drainage capacity and improves the handling performance of the tire on a slippery road; on the other hand, since the width of the fourth longitudinal groove 14 close to the outer side of the tire is the smallest, the ground contact rate of the tread close to the outer side of the tire is large, thereby improving the stability and safety of the tire when turning and driving in a straight line. At the same time, the protrusion 20 with the first recess 30 can disrupt the gas flow direction inside the groove, thereby improving the pumping noise during the tire driving process, reducing the driving noise of the tire, and thus solving the problem that the tire tread structure of the electric vehicle tire in the prior art cannot take into account both the handling performance and the driving noise, and improving the driving experience of the user.

[0029] Specifically, the tire tread structure is the portion of the tire that is the main contact portion between the tire and the running surface.

[0030] In this embodiment, the protrusion 20 is a strip-shaped boss, and the strip-shaped boss extends along the circumference of the tire.

[0031] Optionally, there are multiple strip-shaped bosses, and the multiple strip-shaped bosses are evenly spaced along the circumference of the tire.

[0032] In this embodiment, there are six strip-shaped bosses, and the six strip-shaped bosses are distributed in six equal parts around the central axis of the tire.

[0033] It should be noted that the number of the strip-shaped bosses is not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the number of the strip-shaped bosses is two, three, four, five, seven, eight, or more.

[0034] Optionally, the height H3 of the strip-shaped boss satisfies: 0.3 mm ≤ H3 ≤ 0.5 mm.

[0035] Optionally, the length L of the strip-shaped boss satisfies: 68 mm ≤ L ≤ 72 mm.

[0036] Optionally, the first recess 30 is a strip-shaped recess and is disposed on the surface of the strip-shaped boss. There are a plurality of first recesses 30 , and the plurality of first recesses 30 are spaced apart along the circumferential direction of the tire.

[0037] In this embodiment, the extension direction of the first recessed portion 30 in the first longitudinal groove 11 forms an angle with the width direction of the tire.

[0038] In this embodiment, the extending direction of the first recessed portion 30 located in the second longitudinal groove 12 is consistent with the width direction of the tire.

[0039] like Figure 4 As shown, the bottom of the longitudinal groove 10 is an arc-shaped surface, and along the radial direction of the tire, the arc-shaped surface protrudes toward the side away from the tire to form a convex portion 40. The height H1 of the convex portion 40 satisfies: 0.2mm≤H1≤0.3mm. In this way, the above arrangement makes it difficult for the bottom of the groove to crack after the tire is inflated, thereby extending the service life of the tire; on the other hand, the actual depth of the longitudinal groove 10 (the depth after the tire is inflated) is closer to the designed depth, so as to ensure that the drainage capacity of the longitudinal groove 10 is large enough, thereby improving the drainage performance of the tire.

[0040] In this embodiment, the bottoms of the first longitudinal groove 11 , the second longitudinal groove 12 , the third longitudinal groove 13 and the fourth longitudinal groove 14 are all provided with convex portions 40 .

[0041] Specifically, after the tire is inflated, the bottom of each longitudinal groove 10 will bulge under the action of pressure. The bulging bottom of the groove makes it more prone to cracking, which affects the service life of the tire. It will also cause the actual depth of the longitudinal groove 10 to be less than the designed depth, affecting the drainage performance of the longitudinal groove 10. By setting the bottom of the longitudinal groove 10 as a convex portion 40, the bulging phenomenon of the groove bottom after the tire is inflated is actually taken into consideration during the design stage, which not only completely avoids the problem of cracking of the groove bottom, but also can effectively reduce the depth change value caused by the bulging phenomenon of the groove bottom, so as to ensure that the drainage capacity of the longitudinal groove 10 is closer to the preset drainage capacity.

[0042] like Figure 1 As shown, a plurality of longitudinal grooves 10 separate the tread into a shoulder pattern portion and an intermediate pattern portion located between the two shoulder pattern portions. The shoulder pattern portion close to the inner side of the tire is the inner shoulder pattern portion 50. The tire tread structure also includes a second recess 100 and a third recess 110. The second recess 100 is arranged on the inner shoulder pattern portion 50. The extension direction of the second recess 100 forms a first angle A1 with the width direction of the tire. The first angle A1 satisfies: 6°≤A1<10°. The third recess 110 is arranged on the inner shoulder pattern portion 50. One end of the third recess 110 is connected to the longitudinal groove 10. The other end of the third recess 110 is at a preset distance from the shoulder of the tire. The extension direction of the third recess 110 forms a second angle A2 with the width direction of the tire. The second angle A2 satisfies: 6°≤A2<10°. There are multiple second recesses 100, and multiple third recesses 110. Multiple second recesses 100 are arranged at intervals along the circumference of the tire, and at least one third recess 110 is arranged between two adjacent second recesses 100. Among them, the width of the second recess 100 is W5, and the width of the third recess 110 is W6. The width W5 and the width W6 satisfy: 2.2mm≤W5≤3.5mm, 2.2mm≤W6≤3.5mm. In this way, the above-mentioned width setting, angle setting and number setting of the second recess 100 and the third recess 110 make both of them narrow grooves, so as to increase the grip of the inner shoulder pattern part 50 while avoiding the rigidity of the inner shoulder pattern part 50 being too small, thereby improving the dry and wet handling performance of the tire. At the same time, the above-mentioned setting makes the values ​​of the first angle A1 and the second angle A2 more flexible and diverse, which has adapted to different working conditions and usage requirements, and also improves the processing flexibility of the staff.

[0043] like Figure 1As shown, the shoulder pattern portion close to the outer side of the tire is the outer shoulder pattern portion 90, and the tire tread structure also includes a fourth recess 120, which is arranged on the outer shoulder pattern portion 90, and the extension direction of the fourth recess 120 is arranged at a third angle A3 with the width direction of the tire, and the third angle A3 satisfies: 4°≤A3<8°. The width of the fourth recess 120 is W7, and the width W7 satisfies: 2.2mm≤W7≤3.5mm. Among them, the first angle A1, the second angle A2 and the third angle A3 satisfy: 1°≤A1-A3≤3°, 1°≤A1-A3≤3°. In this way, the above-mentioned arrangement, on the one hand, makes the fourth recess 120 a narrow groove, so as to increase the grip of the outer shoulder pattern portion 90 while avoiding the rigidity of the outer shoulder pattern portion 90 being too small, thereby improving the dry and wet handling performance of the tire; on the other hand, it makes the value of the third angle A3 greater than the values ​​of the first angle A1 and the second angle A2, so as to ensure that the inner shoulder pattern portion 50 has better wet performance than the outer shoulder pattern portion 90, thereby being able to better exert the grip performance of the outer shoulder pattern portion 90, further improving the dry and wet handling performance of the tire.

[0044] In this embodiment, the second recess 100, the third recess 110 and the fourth recess 120 on the inner shoulder pattern portion 50 and the outer shoulder pattern portion 90 all have a depth D1, and the depth D1 and the depth D2 of the longitudinal groove 10 satisfy: 0.6D2≤D1≤0.65D2. In this way, the above arrangement can improve the heat dissipation capacity of the tire and prevent the tire shoulder from generating heat during the running of the tire.

[0045] like Figure 1As shown, the multiple intermediate pattern portions include an inner crown pattern portion 60 and a center pattern portion 70, at least a portion of the center pattern portion 70 coincides with the center plane S of the tire, the inner crown pattern portion 60 is located on the side of the center pattern portion 70 close to the inner side of the tire, and the tire tread structure also includes a fifth recess 130, which is arranged on the inner crown pattern portion 60, and the fifth recess 130 includes a first sub-recess 131, a second sub-recess 132 and a third sub-recess 133 which are interconnected, the second sub-recess 132 is located between the first sub-recess 131 and the third sub-recess 133, and the ends of the first sub-recess 131 and the third sub-recess 133 away from each other are respectively connected to the longitudinal grooves 10 located on both sides of the inner crown pattern portion 60. Among them, the extension direction of the first sub-recess 131 is set at a fourth angle A4 with the width direction of the tire, and the extension direction of the third sub-recess 133 is set at a fifth angle A5 with the width direction of the tire. The fourth angle A4 and the fifth angle A5 satisfy: 32°≤A4≤38°, 22°≤A5≤28°. The width of the fifth recess 130 is W8, and the width W8 satisfies: 0.4mm≤W8≤0.8mm. In this way, the zigzag fifth recess 130 can balance the rigidity of the inner crown pattern portion 60 to ensure that the ground contact pressure of the inner crown pattern portion 60, which is the main ground contact part of the tire, is uniform, thereby improving the ground contact pressure uniformity of the inner crown pattern portion 60. At the same time, the edge of the fifth recess 130 can also cut the water film between the tire tread and the driving surface during the driving process of the tire, so as to avoid the tire slipping caused by the formation of a complete water film between the tire tread and the driving surface, thereby improving the tire's anti-slip ability.

[0046] like Figure 1As shown, the plurality of intermediate tread portions further include an outer crown tread portion 80, which is located on the side of the central tread portion 70 away from the inner side of the tire, and the tire tread structure further includes a sixth recess 140 and a seventh recess 150, the sixth recess 140 being arranged on the central tread portion 70 to connect the longitudinal grooves 10 located on both sides of the central tread portion 70. The seventh recess 150 is arranged on the outer crown tread portion 80 to connect the longitudinal grooves 10 located on both sides of the outer crown tread portion 80. The width W9 of the sixth recess 140 and the width W10 of the seventh recess 150 satisfy: 0.4 mm ≤ W9 ≤ 0.8 mm, 0.4 mm ≤ W10 ≤ 0.8 mm. The sixth recess 140 is arranged at a sixth angle A6 with respect to the width direction of the tire, and the seventh recess 150 is arranged at a seventh angle A7 with respect to the width direction of the tire. The sixth angle A6 and the seventh angle A7 satisfy: 13°≤A6≤19°, 13°≤A7≤19°. Thus, the above arrangement makes the sixth recess 140 and the seventh recess 150 both narrow grooves, and the two can balance the rigidity of the center pattern portion 70 and the outer crown pattern portion 80 respectively, so as to improve the ground contact pressure uniformity of the center pattern portion 70 and the outer crown pattern portion 80, thereby increasing the grip of the two. At the same time, the edges of the sixth recess 140 and the seventh recess 150 can also cut the water film between the tire tread and the driving surface during the driving process of the tire, so as to avoid the tire slipping caused by the formation of a complete water film between the tire tread and the driving surface, thereby improving the tire's anti-slip ability.

[0047] In this embodiment, the sixth angle A6 and the seventh angle A7 have the same magnitude, but are in opposite directions. Figure 1 As shown, the sixth recess 140 is inclined downward, and the seventh recess 150 is inclined upward. In this way, the above arrangement can balance the dry and wet performance between the tread near the inner side of the tire and the tread near the outer side of the tire, so as to further improve the comprehensive performance of the tire; on the other hand, it can improve the self-aligning characteristics of the tire during driving, thereby improving the straight-line driving performance of the tire.

[0048] Specifically, the inner crown pattern portion 60, the center pattern portion 70 and the outer crown pattern portion 80 are actually the main contact portions between the tire tread and the ground. The above-mentioned arrangement of the fifth recess 130, the sixth recess 140 and the seventh recess 150 ensures that the main contact portions between the tire and the ground have a higher ground pressure uniformity, thereby increasing the tire's grip as a whole. The fine grooves are used to separate the various pattern portions, which can increase the rigidity of each pattern portion and reduce the deformation of the pattern blocks while improving the tire's ability to cut water film. The phenomenon of tipping over of the pattern blocks is avoided, thereby ensuring the tire's load-bearing capacity; on the other hand, it can cope with the adverse effects of the high torque generated when the electric vehicle is started on the tire, thereby extending the service life of the tire.

[0049] Optionally, a plurality of second recesses 100 separate the inner shoulder pattern portion 50 into a plurality of inner shoulder pattern blocks 51, and a pattern group is formed between the inner shoulder pattern block 51 and a second recess 100 adjacent thereto; and / or, a plurality of fourth recesses 120 are provided at intervals along the circumference of the tire to separate the outer shoulder pattern portion 90 into a plurality of outer shoulder pattern blocks 91, and a pattern group is formed between the outer shoulder pattern block 91 and a fourth recess 120 adjacent thereto; and / or, a plurality of fifth recesses 130 are provided at intervals along the circumference of the tire to separate the inner crown pattern portion 60 into a plurality of inner crown pattern blocks 61, and a pattern group is formed between the inner crown pattern block 61 and a fifth recess 130 adjacent thereto; and / or, a plurality of sixth recesses 140 are provided at intervals along the circumference of the tire, The center tread portion 70 is divided into a plurality of center tread blocks 71, and a pattern group is formed between the center tread block 71 and a sixth recess 140 adjacent thereto; and / or, there are a plurality of seventh recesses 150, and the plurality of seventh recesses 150 are arranged at intervals along the circumferential direction of the tire, and the outer crown tread portion 80 is divided into a plurality of outer crown tread blocks 81, and a pattern group is formed between the outer crown tread block 81 and a seventh recess 150 adjacent thereto; wherein, there are a plurality of pattern groups, and the plurality of pattern groups include a first pattern group, a second pattern group, a third pattern group and a fourth pattern group, and the length P1 of the first pattern group, the length P2 of the second pattern group, the length P3 of the third pattern group and the length P4 of the fourth pattern group satisfy the following conditions: 1.123P1≤P2≤1.183P1, 1.351P1≤P3≤1.411P1, 1.471P1≤P4≤1.531P1. In this way, the above arrangement makes the pattern distribution on the tire tread structure more chaotic, which is beneficial to reduce the probability of the tire generating resonance during driving, thereby reducing the driving noise of the tire and improving the driving comfort of the user.

[0050] In this embodiment, the length of the pattern group is actually the pitch of the tire.

[0051] In this embodiment, the actual length of the pattern group is obtained through finite element simulation analysis.

[0052] Optionally, the arc length TAW satisfies the following relationship with the nominal section width SN of the tire: 0.84SN≤TAW≤0.91SN. On the radial cross section of the tire, the tread has an arc-shaped profile curve G, and there is a maximum distance H2 between the chord of the arc-shaped profile curve G and the arc-shaped profile curve G, and the maximum distance H2 satisfies the following relationship with the arc length TAW: 0.042TAW≤H2≤0.048TAW. Among them, the arc-shaped profile curve G located on one side of the center plane S of the tire includes a first arc-shaped profile curve, a second arc-shaped profile curve and a third arc-shaped profile curve connected in sequence; the arc length CL1 of the first arc-shaped profile curve, the arc length CL2 of the second arc-shaped profile curve, the arc length CL3 of the third arc-shaped profile curve and the arc length TAW satisfy the following relationship: 0.165TAW≤CL1≤0.180TAW, 0.165TAW≤CL2≤0.180TAW, 0.150TAW≤CL3≤0.175TAW. In this way, by optimizing the length ratio of the arc profile curve, the uniformity of the ground pressure distribution between the tire and the ground can be further improved. At the same time, by optimizing the value of the maximum distance H2, while ensuring that the contact surface between the tire and the ground has a sufficiently large width, it can not only reduce the force on the shoulder, but also increase the force within the tire's ground contact range, which is beneficial for the tread structure to break through the water film, further improving the tire's wet performance and handling performance.

[0053] In this embodiment, the above setting of the maximum distance H2 ensures that its value is relatively appropriate. On the one hand, it can prevent the maximum distance H2 from being too large, which will lead to a reduction in the tire contact patch width, thereby reducing the dry handling performance of the tire; on the other hand, it can prevent the maximum distance H2 from being too small, which will lead to a reduction in the wet driving safety of the tire.

[0054] In this embodiment, the maximum distance H2 is the distance between the highest point of the arc-shaped profile curve G and its chord length.

[0055] In this embodiment, the highest point of the arc-shaped contour curve G is its midpoint, that is, the arc-shaped contour curve G is a symmetrical structure.

[0056] In this embodiment, the arc length TAW is actually the arc length of the arc profile curve G.

[0057] like Figure 2As shown, on the radial cross section of the tire, the first longitudinal groove 11, the second longitudinal groove 12 and the third longitudinal groove 13 have a first intersection point between the groove wall near the outer side of the tire and the arcuate profile curve G, and the tangent line of the arcuate profile curve G at the first intersection and the groove wall are set at an eighth angle A8. The first longitudinal groove 11, the second longitudinal groove 12 and the third longitudinal groove 13 have a second intersection point between the groove wall away from the outer side of the tire and the arcuate profile curve G, and the tangent line of the arcuate profile curve G at the second intersection and the groove wall are set at a ninth angle A9, and the eighth angle A8 and the ninth angle A9 satisfy: 76°≤A8≤80°, 73°≤A9≤77°. There is a third intersection between the groove wall of the fourth longitudinal groove 14 near the outer side of the tire and the arc profile curve G, and the tangent of the arc profile curve G at the third intersection is set at the tenth angle A10 with the groove wall. There is a fourth intersection between the groove wall of the fourth longitudinal groove 14 away from the outer side of the tire and the arc profile curve G, and the tangent of the arc profile curve G at the fourth intersection is set at the eleventh angle A11 with the groove wall. The tenth angle A10 and the eleventh angle A11 meet: 78°≤A10≤82°, 78°≤A11≤80°. In this way, the above setting ensures that the groove wall angle of the longitudinal groove 10 near the inner side of the tire is smaller, and the groove wall angle near the outer side of the tire is larger, which ensures that each pattern part is not easy to fall down when subjected to external force on the one hand; on the other hand, it ensures that the groove wall of the longitudinal groove 10 near the inner side of the tire can generate shear force on the ground during the running of the tire, further improving the tire's ability to cut water film, thereby improving the tire's anti-wetting performance.

[0058] like Figure 3 As shown, the contact surface between each intermediate pattern portion and the driving surface is projected on the radial section of the tire as an arc line, and there is a maximum distance between the chord of the arc line and the arc line. Among them, the inner crown pattern portion 60 has a maximum distance K1, and the maximum distance K1 satisfies: 0.23mm≤K1≤0.35mm, the center pattern portion 70 has a maximum distance K2, and the maximum distance K2 satisfies: 0.23mm≤K2≤0.35mm, and the outer crown pattern portion 80 has a maximum distance K3, and the maximum distance K3 satisfies: 0.23mm≤K3≤0.35mm. The maximum distance K1, the maximum distance K2 and the maximum distance K3 satisfy: H3<H2

[0059] ​In this embodiment, each pattern block is actually a symmetrical structure, that is, the pattern blocks are symmetrical to each other with the plane where the points on the arc line corresponding to the maximum distance are located being the symmetry plane.

[0060] like Figure 1 As shown, the edges of the second recess 100, the third recess 110, the fourth recess 120, the fifth recess 130, the sixth recess 140 and the seventh recess 150 in this embodiment (which can also be the corners of the pattern blocks) are provided with cut corners (chamfers). In this way, the above arrangement makes the tire tread structure more beautiful on the one hand; on the other hand, it can optimize the effective ground contact rate in the tire ground contact surface and balance the dry and wet performance of high-performance tires. At the same time, it can also ensure that each pattern portion has sufficient rigidity to cope with the high load requirements of electric vehicles on tires.

[0061] Table 1: Comprehensive evaluation table of old design tires and tires using the tire tread structure of this embodiment

[0062]

[0063]

[0064] The test items on the above surface evaluate the performance of the test vehicle when it is driving at a specified speed on a simulated urban road surface in a professional test field. The results are expressed as an index with the value of the comparison example (old design tire) being 100. The larger the value, the better the performance in the evaluation item.

[0065] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0066] The plurality of longitudinal grooves of the tire tread structure all extend along the circumference of the tire, and the plurality of longitudinal grooves are arranged at intervals along the width direction of the tire, and include a first longitudinal groove, a second longitudinal groove, a third longitudinal groove, and a fourth longitudinal groove arranged in sequence from the inner side of the tire to the outer side of the tire, and the tire tread has an arc length TAW, and the width W1 of the first longitudinal groove, the width W2 of the second longitudinal groove, the width W3 of the third longitudinal groove, the width W4 of the fourth longitudinal groove, and the arc length TAW satisfy: 0.052TAW≤W1≤0.072TAW, 0.061TAW≤W2≤0.081TAW, 0.059TAW≤W3≤0.079TAW, 0.026TAW≤W4≤0.046TAW. Among them, a protrusion is provided on the groove bottom of the first longitudinal groove and / or the groove bottom of the second longitudinal groove, and a first recess is provided on the protrusion. In this way, the width settings of the first longitudinal groove, the second longitudinal groove, the third longitudinal groove and the fourth longitudinal groove ensure that the drainage area of ​​the tire is appropriate, thereby ensuring that the tire has a sufficiently large drainage capacity and improving the handling performance of the tire on slippery roads; on the other hand, since the width of the fourth longitudinal groove close to the outer side of the tire is the smallest, the ground contact rate of the tread close to the outer side of the tire is large, thereby improving the stability and safety of the tire when turning and driving in a straight line. At the same time, the protrusion with the first concave portion can disrupt the gas flow inside the groove, thereby improving the pumping noise during the tire driving process and reducing the driving noise of the tire, thereby solving the problem that the tire tread structure of the electric vehicle tire in the prior art cannot take into account both the handling performance and the driving noise, and improving the user's driving experience.

[0067] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0070] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tire tread structure, characterized in that: include: A plurality of longitudinal grooves (10), each of the longitudinal grooves (10) extending along the circumference of the tire, the plurality of longitudinal grooves (10) being arranged at intervals along the width direction of the tire, and comprising a first longitudinal groove (11), a second longitudinal groove (12), a third longitudinal groove (13) and a fourth longitudinal groove (14) arranged in sequence from the inner side of the tire to the outer side of the tire, the tread of the tire having an arc length TAW, the width W1 of the first longitudinal groove (11), the width W2 of the second longitudinal groove (12), the width W3 of the third longitudinal groove (13), the width W4 of the fourth longitudinal groove (14) and the arc length TAW satisfying the following conditions: 0.052TAW≤W1≤0.072TAW, 0.061TAW≤W2≤0.081TAW, 0.059TAW≤W3≤0.079TAW, 0.026TAW≤W4≤0.046TAW; A protrusion (20) is provided on the bottom of the first longitudinal groove (11) and / or the bottom of the second longitudinal groove (12), and a first recess (30) is provided on the protrusion (20).

2. The tire tread structure according to claim 1, characterized in that: The bottom of the longitudinal groove (10) is an arc-shaped surface, and along the radial direction of the tire, the arc-shaped surface bulges toward a side away from the tire to form a convex portion (40); The height H1 of the convex portion (40) satisfies: 0.2 mm ≤ H1 ≤ 0.3 mm.

3. The tire tread structure according to claim 1, characterized in that: The plurality of longitudinal grooves (10) divide the tread into a shoulder pattern portion and an intermediate pattern portion located between the two shoulder pattern portions, the shoulder pattern portion close to the inner side of the tire is an inner shoulder pattern portion (50), and the tire tread structure further comprises: A second recess (100) is arranged on the inner shoulder pattern portion (50), and an extension direction of the second recess (100) forms a first angle A1 with the width direction of the tire, and the first angle A1 satisfies: 6°≤ A1＜10°； A third recess (110) is arranged on the inner shoulder pattern portion (50), one end of the third recess (110) is connected to the longitudinal groove (10), the other end of the third recess (110) is at a preset distance from the shoulder of the tire, and the extension direction of the third recess (110) forms a second angle A2 with the width direction of the tire, and the second angle A2 satisfies: 6°≤A2<10°; There are a plurality of the second recesses (100), and a plurality of the third recesses (110), wherein the plurality of the second recesses (100) are arranged at intervals along the circumferential direction of the tire, and at least one third recess (110) is arranged between two adjacent second recesses (100); The width of the second recess (100) is W5, the width of the third recess (110) is W6, and the width W5 and the width W6 satisfy: 2.2 mm ≤ W5 ≤ 3.5 mm, 2.2 mm ≤ W6 ≤ 3.5 mm.

4. The tire tread structure according to claim 3, characterized in that: The shoulder pattern portion close to the outer side of the tire is an outer shoulder pattern portion (90), and the tire tread structure further includes: The fourth recess (120) is arranged on the outer shoulder pattern portion (90), and the extension direction of the fourth recess (120) forms a third angle A3 with the width direction of the tire, and the third angle A3 satisfies: 4°≤ A3＜8°； The width of the fourth recess (120) is W7, and the width W7 satisfies: 2.2 mm ≤ W7 ≤ 3.5 mm; Among them, the first angle A1, the second angle A2 and the third angle A3 satisfy the following conditions: 1°≤A1-A3≤3°, 1°≤A1-A3≤3°.

5. The tire tread structure according to claim 4, characterized in that: The plurality of intermediate tread portions include an inner crown tread portion (60) and a center tread portion (70), at least a portion of the center tread portion (70) coincides with a center plane S of the tire, the inner crown tread portion (60) is located on a side of the center tread portion (70) close to the inner side of the tire, and the tire tread structure further includes: a fifth recess (130) disposed on the inner tread crown pattern portion (60), the fifth recess (130) comprising a first sub-recess (131), a second sub-recess (132) and a third sub-recess (133) which are connected to each other, the second sub-recess (132) being located between the first sub-recess (131) and the third sub-recess (133), and the ends of the first sub-recess (131) and the third sub-recess (133) which are away from each other are respectively connected to the longitudinal grooves (10) located on both sides of the inner tread crown pattern portion (60); The first sub-recess (131) is arranged at a fourth angle A4 with respect to the width direction of the tire, the third sub-recess (133) is arranged at a fifth angle A5 with respect to the width direction of the tire, and the fourth angle A4 and the fifth angle A5 satisfy: 32°≤A4≤38°, 22°≤A5≤28°; The width of the fifth recess (130) is W8, and the width W8 satisfies: 0.4mm≤W8≤0.8mm.

6. The tire tread structure according to claim 5, characterized in that: The plurality of intermediate tread portions further include an outer crown tread portion (80), wherein the outer crown tread portion (80) is located on a side of the central tread portion (70) away from the inner side of the tire, and the tire tread structure further includes: a sixth recess (140) disposed on the central tread portion (70) for connecting the longitudinal grooves (10) located on both sides of the central tread portion (70); A seventh recess (150) is provided on the outer tread crown pattern portion (80) to connect the longitudinal grooves (10) located on both sides of the outer tread crown pattern portion (80); The width W9 of the sixth recess (140) and the width W10 of the seventh recess (150) satisfy: 0.4 mm ≤ W9 ≤ 0.8 mm, 0.4 mm ≤ W10 ≤ 0.8 mm; The extension direction of the sixth recess (140) forms a sixth angle A6 with the width direction of the tire, and the extension direction of the seventh recess (150) forms a seventh angle A7 with the width direction of the tire. The sixth angle A6 and the seventh angle A7 satisfy: 13°≤A6≤19°, 13°≤A7≤19°.

7. The tire tread structure according to claim 6, characterized in that: The plurality of second recesses (100) divide the inner shoulder pattern portion (50) into a plurality of inner shoulder pattern blocks (51), and the inner shoulder pattern block (51) and a second recess (100) adjacent thereto form a pattern group; and / or, There are a plurality of the fourth recesses (120), and the plurality of the fourth recesses (120) are arranged at intervals along the circumferential direction of the tire to separate the outer shoulder pattern portion (90) into a plurality of outer shoulder pattern blocks (91), and the outer shoulder pattern block (91) and a fourth recess (120) adjacent thereto form a pattern group; and / or, There are a plurality of the fifth recesses (130), and the plurality of the fifth recesses (130) are arranged at intervals along the circumferential direction of the tire to separate the inner crown pattern portion (60) into a plurality of inner crown pattern blocks (61), and the inner crown pattern block (61) and one of the fifth recesses (130) adjacent thereto form a pattern group; and / or, There are a plurality of the sixth recesses (140), and the plurality of the sixth recesses (140) are arranged at intervals along the circumferential direction of the tire to divide the central tread portion (70) into a plurality of central tread blocks (71), and the central tread block (71) and a sixth recess (140) adjacent thereto form a tread group; and / or, There are a plurality of the seventh recesses (150), which are arranged at intervals along the circumferential direction of the tire, and the outer crown pattern portion (80) is divided into a plurality of outer crown pattern blocks (81), and the outer crown pattern block (81) and an adjacent seventh recess (150) form a pattern group; There are multiple pattern groups, including a first pattern group, a second pattern group, a third pattern group and a fourth pattern group. The length P1 of the first pattern group, the length P2 of the second pattern group, the length P3 of the third pattern group and the length P4 of the fourth pattern group satisfy: 1.123P1≤P2≤1.183P1, 1.351P1≤P3≤1.411P1, 1.471P1≤P4≤1.531P1.

8. The tire tread structure according to claim 1, characterized in that: The arc length TAW and the nominal section width SN of the tire satisfy the following conditions: 0.84SN≤TAW≤0.91SN; On the radial cross section of the tire, the tread has an arc-shaped profile curve G, a maximum distance H2 exists between a chord of the arc-shaped profile curve G and the arc-shaped profile curve G, and the maximum distance H2 satisfies the arc length TAW: 0.042TAW≤H2≤0.048TAW; Among them, the arc profile curve G located on one side of the center plane S of the tire includes a first arc profile curve, a second arc profile curve and a third arc profile curve connected in sequence; the arc length CL1 of the first arc profile curve, the arc length CL2 of the second arc profile curve, the arc length CL3 of the third arc profile curve and the arc length TAW satisfy: 0.165TAW≤CL1≤0.180TAW, 0.165TAW≤CL2≤0.180TAW, 0.150TAW≤CL3≤0.175TAW.

9. The tire tread structure according to claim 8, characterized in that: In the radial cross section of the tire, The first longitudinal groove (11), the second longitudinal groove (12) and the third longitudinal groove (13) have a first intersection point between the groove wall close to the outer side of the tire and the arcuate profile curve G, and the tangent line of the arcuate profile curve G at the first intersection point forms an eighth angle A8 with the groove wall; A second intersection point is formed between the groove wall of the first longitudinal groove (11), the second longitudinal groove (12) and the third longitudinal groove (13) away from the outer side of the tire and the arcuate profile curve G, a ninth angle A9 is formed between the tangent of the arcuate profile curve G at the second intersection and the groove wall, and the eighth angle A8 and the ninth angle A9 satisfy: 76°≤A8≤80°, 73°≤A9≤77°; The fourth longitudinal groove (14) has a third intersection point between the groove wall close to the outer side of the tire and the arcuate contour curve G, and the tangent line of the arcuate contour curve G at the third intersection forms a tenth angle A10 with the groove wall. The fourth longitudinal groove (14) has a fourth intersection point between the groove wall away from the outer side of the tire and the arcuate contour curve G, and the tangent line of the arcuate contour curve G at the fourth intersection forms an eleventh angle A11 with the groove wall. The tenth angle A10 and the eleventh angle A11 satisfy: 78°≤A10≤82°, 78°≤A11≤80°.

10. The tire tread structure according to claim 6, characterized in that: The projection of the contact surface between each of the intermediate pattern portions and the running surface on the radial cross section of the tire is an arc line, and the chord of the arc line has a maximum distance with the arc line; The inner tread crown pattern portion (60) has a maximum distance K1, and the maximum distance K1 satisfies: 0.23 mm ≤ K1 ≤ 0.35 mm; the center pattern portion (70) has a maximum distance K2, and the maximum distance K2 satisfies: 0.23 mm ≤ K2 ≤ 0.35 mm; the outer tread crown pattern portion (80) has a maximum distance K3, and the maximum distance K3 satisfies: 0.23 mm ≤ K3 ≤ 0.35 mm; The maximum distance K1, the maximum distance K2 and the maximum distance K3 satisfy the following: H3<H2<H1.

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