Tire tread structure

Abstract

The invention provides a tire tread structure which comprises a plurality of longitudinal grooves extending in the circumferential direction of a tire, and the longitudinal grooves are formed in the width direction of the tire at intervals so as to divide a tire tread of the tire into two tire shoulder pattern parts and a middle pattern part located between the two tire shoulder pattern parts. The first communicating groove is formed in the middle pattern part and is used for communicating two adjacent longitudinal grooves; wherein the number of the first communicating grooves is multiple, the multiple first communicating grooves are formed in the circumferential direction of the tire at intervals so as to divide the middle pattern part into multiple middle pattern blocks, at least part of the middle pattern blocks are located in a wear heat generation area of the tire, the wear heat generation area has the area S1, and the middle pattern blocks located in the wear heat generation area have the area S2; the area S1 and the area S2 meet the condition that 0.75 S1 < = S2 < = 0.85 S2. The mining dump truck tire effectively solves the problem that a mining dump truck tire in the prior art cannot give consideration to the control performance, the heat dissipation performance, the wear resistance and the cutting resistance at the same time.

Description

Technical Field

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

[0002] At present, mining dump trucks often face complex mining road conditions under different climatic conditions during actual work. For example, in the rainy season with more rainfall, the mining road is muddy and slippery, and the tires of mining dump trucks need to have better handling performance. In the hot and dry season with less rain, the temperature of the mining road is high, and the tires of mining dump trucks need to have better heat resistance and heat dissipation performance (heat resistance is often determined by the performance of tire rubber). At the same time, since mining roads are usually unpaved roads with more gravel on the road, the tires of mining dump trucks also need to have higher wear resistance and cutting resistance.

[0003] However, there is a lack of tires on the market that can balance handling performance, heat dissipation performance, wear resistance and cutting resistance. Especially when heat accumulates and the temperature rises on the tread, the rubber on the tread is more likely to wear and be cut, which leads to a shorter service life of mining dump truck tires, seriously affecting the user's cost of use. Summary of the invention

[0004] The main purpose of the present invention is to provide a tire tread structure to solve the problem that the mining dump truck tires in the prior art cannot take into account the handling performance, heat dissipation performance, wear resistance and cutting resistance.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a tire tread structure, comprising: 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 to separate the tire tread into two shoulder pattern portions and an intermediate pattern portion located between the two shoulder pattern portions; a first connecting groove, which is arranged on the intermediate pattern portion, and the first connecting groove is used to connect two adjacent longitudinal grooves; wherein, there are a plurality of first connecting grooves, and the plurality of first connecting grooves are arranged at intervals along the circumference of the tire to separate the intermediate pattern portion into a plurality of intermediate pattern blocks, at least part of the intermediate pattern blocks are located in the wear and heat generating area of ​​the tire, the wear and heat generating area has an area S1, and the intermediate pattern block located in the wear and heat generating area has an area S2, and the area S1 and the area S2 satisfy the following: 0.75S1≤S2≤0.85S2.

[0006] Furthermore, there are multiple intermediate tread portions, and in two adjacent intermediate tread portions, the multiple first connecting grooves on one intermediate tread portion are arranged correspondingly to the multiple first connecting grooves on the other intermediate tread portion.

[0007] Furthermore, the tire tread structure also includes: the first connecting groove includes a first sub-groove, a second sub-groove and a third sub-groove that are interconnected, the second sub-groove is located between the first sub-groove and the third sub-groove, the extension direction of the first sub-groove is set at a first angle A1 with the width direction of the tire, the extension direction of the second sub-groove is set at a second angle A2 with the width direction of the tire, and the extension direction of the third sub-groove is set at a third angle A3 with the width direction of the tire; wherein the first angle A1, the second angle A2 and the third angle A3 satisfy the following: 4°≤A1≤8°, 52°≤A2≤56°, 4°≤A3≤8°.

[0008] Furthermore, the tire tread structure also includes: a second connecting groove, which is arranged on the shoulder pattern portion, one end of the second connecting groove extends into the longitudinal groove adjacent to the shoulder pattern portion, and the other end of the second connecting groove extends to the shoulder of the tire to be connected with the side of the tire; wherein the second connecting groove includes a fourth sub-groove, a fifth sub-groove and a sixth sub-groove that are interconnected, the fifth sub-groove is located between the fourth sub-groove and the sixth sub-groove, the extension direction of the fourth sub-groove is set at a fourth angle A4 with the width direction of the tire, the extension direction of the fifth sub-groove is set at a fifth angle A5 with the width direction of the tire, and the extension direction of the sixth sub-groove is set at a sixth angle A6 with the width direction of the tire, and the fourth angle A4, the fifth angle A5 and the sixth angle A6 satisfy the following: 4°≤A4≤8°, 52°≤A5≤56°, 4°≤A6≤8°.

[0009] Furthermore, a plurality of second connecting grooves separate the shoulder pattern portion into a plurality of shoulder pattern blocks, and the tire tread structure also includes: a groove, at least part of which is arranged on the shoulder pattern block, one end of the groove extends to the shoulder of the tire to be connected with the side of the tire, and the other end of the groove extends toward the center plane S of the tire into the middle pattern portion and is spaced apart from the center plane S; wherein, the overall extension direction of the groove is arranged at a seventh angle A7 with the width direction of the tire, and the seventh angle A7 satisfies: 10°≤A7≤11°, and the width of the groove gradually decreases in the direction from the shoulder pattern block to the center plane S.

[0010] Further, the middle tread portion has a width L2, the portion of the groove located in the middle tread portion has a length l in the width direction of the tire, and the width L2 and the length l satisfy: 0.15L2≤l≤0.5L2.

[0011] Furthermore, the multiple longitudinal grooves include: a first longitudinal groove, at least a portion of the first longitudinal groove coincides with the center plane S of the tire, a plurality of first heat dissipation recesses are arranged on the groove wall of the first longitudinal groove, the plurality of first heat dissipation recesses located on one groove wall of the first longitudinal groove are arranged one-to-one correspondingly to the plurality of first heat dissipation recesses located on another groove wall of the first longitudinal groove, a first heat dissipation portion is formed between the first heat dissipation recesses and the first heat dissipation recesses arranged correspondingly thereto, the first longitudinal groove has a width W1, the first heat dissipation portion has a maximum width W2, and the width W1 and the maximum width W2 satisfy: 2.5W1≤W2≤4W2; the longitudinal groove located on one side of the first longitudinal groove is a second longitudinal groove, and the second longitudinal groove is arranged in a broken line shape.

[0012] Furthermore, a second heat dissipation recess is provided on the groove wall of the first connecting groove, and the second heat dissipation recess located on one groove wall of the first connecting groove and the second heat dissipation recess located on the other groove wall of the first connecting groove are formed between the second heat dissipation recess. The first connecting groove has a width W3, and the second heat dissipation portion has a maximum width W4. The width W3 and the maximum width W4 satisfy: 2.5W3≤W4≤4W3.

[0013] Further, in the cross-section where the first longitudinal groove has the first heat dissipation portion, the groove wall of the first longitudinal groove includes a first groove wall surface and a second groove wall surface connected to each other, the second groove wall surface is arc-shaped and is arranged away from the groove bottom of the first longitudinal groove relative to the first groove wall surface, and along the direction from the groove bottom of the first longitudinal groove to the tread, the distance between the second groove wall surfaces on the two groove walls of the first longitudinal groove gradually increases to form first heat dissipation recesses on the two groove walls of the first longitudinal groove respectively; in the cross-section where the first connecting groove has the second heat dissipation portion, the groove wall of the first connecting groove includes a third groove wall surface and a fourth groove wall surface connected to each other, the fourth groove wall surface is arc-shaped and is arranged away from the groove bottom of the first connecting groove relative to the third groove wall surface, and along the direction from the groove bottom of the first connecting groove to the tread, the distance between the fourth groove wall surfaces on the two groove walls of the first connecting groove gradually increases to form second heat dissipation recesses on the two groove walls of the first connecting groove respectively.

[0014] Furthermore, a strip structure reinforcement is arranged on the bottom of the second longitudinal groove, and one groove wall of the second longitudinal groove is connected to another groove wall of the second longitudinal groove through the strip structure reinforcement; wherein, the connecting end of the first connecting groove and the second longitudinal groove and the strip structure reinforcement are staggered; and / or, the connecting end of the second connecting groove and the second longitudinal groove and the strip structure reinforcement are staggered.

[0015] Furthermore, the shoulder pattern portion has a width L1, the middle pattern portion has a width L2, the tread has a width L3, and the width L1, the width L2 and the width L3 satisfy: 0.225L3≤L1≤0.25L3, 0.25L3≤L2≤0.275L3.

[0016] Furthermore, a groove wall of the groove includes a first sub-groove wall, a second sub-groove wall and a third sub-groove wall connected in sequence, the second sub-groove wall forms a step surface on the groove wall of the groove, and the connection between the first sub-groove wall and the second sub-groove wall and the connection between the second sub-groove wall and the third sub-groove wall are both provided with chamfers, and the groove bottom of the groove is arranged in an arc shape; wherein, the extension direction of the first sub-groove wall and the extension direction of the third sub-groove wall are both arranged at an eighth angle A8 with the normal of the groove, and the eighth angle A8 satisfies: 12.5°≤A6≤15°, there is a distance L4 between the first sub-groove wall and the third sub-groove wall, the distance L4 satisfies: 4mm≤L4≤6mm, the depth H1 of the groove satisfies: 70mm≤H1≤85mm, and the height H2 of the first sub-groove wall and the depth H1 satisfy: 0.3H1≤H2≤0.5H1.

[0017] According to the technical solution of the present invention, the plurality of longitudinal grooves of the tire tread structure extend along the circumference of the tire, and the plurality of longitudinal grooves are arranged at intervals along the width direction of the tire to separate the tire tread into two shoulder pattern portions and an intermediate pattern portion located between the two shoulder pattern portions, and the first connecting groove is arranged on the intermediate pattern portion, and the first connecting groove is used to connect two adjacent longitudinal grooves. There are a plurality of first connecting grooves, and the plurality of first connecting grooves are arranged at intervals along the circumference of the tire to separate the intermediate pattern portion into a plurality of intermediate pattern blocks, and at least part of the intermediate pattern blocks are located in the wear and heat generating area of ​​the tire, and the wear and heat generating area has an area S1, and the intermediate pattern blocks located in the wear and heat generating area have an area S2, and the area S1 and the area S2 satisfy the following: 0.75S1≤S2≤0.85S2. In this way, the wear and heat generating area of ​​the tire is actually the core friction and heat accumulation area of ​​the tire during rolling and driving. The tread in the wear and heat generating area is divided into a large number of independent intermediate pattern blocks through the longitudinal grooves and the first connecting grooves, so that the heat generated in the wear and heat generating area can be dissipated through the longitudinal grooves and the first connecting grooves. The above-mentioned setting of area S1 and area S2 ensures that the contact area between the tread in the wear and heat generating area and the running surface is relatively appropriate, which not only enables a sufficiently large friction force to be generated between the tire and the running surface, but also improves the traction performance and handling performance of the tire. It also makes each middle pattern block have good rigidity, thereby improving the wear resistance and cut resistance of the tire tread; on the other hand, it ensures that the groove area size of the wear and heat generating area is relatively appropriate, so that the heat generated by the tire during driving can be dissipated through the grooves in time, thereby improving the heat dissipation performance of the tire, avoiding the problem of accelerated wear caused by heat accumulation on the tread, and further improving the heat dissipation performance and wear resistance and cut resistance of the tire, thereby solving the problem in the prior art that mining dump truck tires cannot take into account the handling performance, heat dissipation performance and wear resistance and cut resistance, thereby extending the service life of the tire. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a 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 of the present invention. In the drawings:

[0019] Figure 1 A partial front view showing an embodiment of a tire tread structure according to the present invention;

[0020] Figure 2 Shows Figure 1 A schematic cross-sectional view of the tire tread structure at BB;

[0021] Figure 3 Shows Figure 1 A schematic cross-sectional view of the tire tread structure at JJ;

[0022] Figure 4 Shows Figure 1 A schematic cross-sectional view of a tire tread structure at CC;

[0023] Figure 5 Shows Figure 1 A schematic cross-sectional view of the tire tread structure at DD;

[0024] Figure 6 Shows Figure 1 A schematic cross-sectional view of the tire tread structure at GG;

[0025] Figure 7 Shows Figure 1 A schematic cross-sectional view of the tire tread structure at FF;

[0026] Figure 8 Shows Figure 1 A schematic cross-sectional view of the EE of the tire tread structure;

[0027] Fig. 9 Shows Figure 1 Schematic diagram of the longitudinal section of the strip structural reinforcement of the tire tread structure.

[0028] The above drawings include the following reference numerals:

[0029] 1. Wear heat generating area; 10. Longitudinal groove; 11. First longitudinal groove; 111. First heat dissipation recess; 112. First groove wall; 113. Second groove wall; 12. Second longitudinal groove; 20. Shoulder pattern portion; 21. Shoulder pattern block; 30. Middle pattern portion; 31. Middle pattern block; 40. First connecting groove; 41. First sub-groove; 42. Second sub-groove; 43. Third sub-groove; 44. Second heat dissipation recess; 45. Third groove wall; 46. Fourth groove wall; 50. Second connecting groove; 51. Fourth sub-groove; 52. Fifth sub-groove; 53. Sixth sub-groove; 60. Concave groove; 61. First sub-groove wall; 62. Second sub-groove wall; 63. Third sub-groove wall; 70. Strip structure reinforcement; 80. Wear mark. DETAILED DESCRIPTION

[0030] 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 invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] 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.

[0032] In the present invention, unless otherwise specified, the directional words used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer 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.

[0033] In order to solve the problem in the prior art that mining dump truck tires cannot take into account the handling performance, heat dissipation performance, wear resistance and cut resistance at the same time, the present application provides a tire tread structure.

[0034] like Figures 1 to 9 As shown, the tire tread structure includes a plurality of longitudinal grooves 10 and a first connecting groove 40, each longitudinal groove 10 extends along the circumferential direction of the tire, and the plurality of longitudinal grooves 10 are arranged at intervals along the width direction of the tire to separate the tire tread into two shoulder pattern portions 20 and a middle pattern portion 30 located between the two shoulder pattern portions 20, and the first connecting groove 40 is arranged on the middle pattern portion 30, and the first connecting groove 40 is used to connect two adjacent longitudinal grooves 10. There are a plurality of first connecting grooves 40, and the plurality of first connecting grooves 40 are arranged at intervals along the circumferential direction of the tire to separate the middle pattern portion 30 into a plurality of middle pattern blocks 31, and at least part of the middle pattern blocks 31 are located in the wear and heat generating area 1 of the tire, and the wear and heat generating area 1 has an area S1, and the middle pattern blocks 31 located in the wear and heat generating area 1 have an area S2, and the area S1 and the area S2 satisfy: 0.75S1≤S2≤0.85S2.

[0035] According to the technical solution of this embodiment, the plurality of longitudinal grooves 10 of the tire tread structure extend along the circumference of the tire, and the plurality of longitudinal grooves 10 are arranged at intervals along the width direction of the tire to separate the tread of the tire into two shoulder pattern portions 20 and a middle pattern portion 30 located between the two shoulder pattern portions 20. The first connecting groove 40 is arranged on the middle pattern portion 30, and the first connecting groove 40 is used to connect two adjacent longitudinal grooves 10. There are a plurality of first connecting grooves 40, and the plurality of first connecting grooves 40 are arranged at intervals along the circumference of the tire to separate the middle pattern portion 30 into a plurality of middle pattern blocks 31, and at least part of the middle pattern blocks 31 are located in the wear and heat generating area 1 of the tire, and the wear and heat generating area 1 has an area S1, and the middle pattern blocks 31 located in the wear and heat generating area have an area S2, and the area S1 and the area S2 satisfy: 0.75S1≤S2≤0.85S2. In this way, the wear and heat generating area 1 of the tire is actually the core friction and heat accumulation area of ​​the tire during rolling and driving. The tread in the wear and heat generating area 1 is divided into a large number of independent intermediate pattern blocks 31 through the longitudinal grooves 10 and the first connecting grooves 40, so that the heat generated in the wear and heat generating area 1 can be dissipated through the longitudinal grooves 10 and the first connecting grooves 40. The above-mentioned setting of area S1 and area S2 ensures that the contact area between the tread in the wear and heat generating area 1 and the driving surface is relatively appropriate, which not only enables a sufficiently large friction force to be generated between the tire and the driving surface, but also improves the traction performance of the tire. and handling performance, and also make each middle pattern block 31 have good rigidity, thereby improving the wear resistance and cut resistance of the tire tread; on the other hand, it ensures that the groove area of ​​the wear and heat generating area 1 is relatively appropriate, so that the heat generated by the tire during driving can be dissipated through the grooves in time, thereby improving the heat dissipation performance of the tire, avoiding the problem of accelerated wear caused by heat accumulation on the tread, and further improving the heat dissipation performance and wear resistance and cut resistance of the tire, thereby solving the problem in the prior art that the mining dump truck tire cannot take into account the handling performance, heat dissipation performance and wear resistance and cut resistance, and extending the service life of the tire.

[0036] In the present embodiment, there are three longitudinal grooves 10 , which are arranged at intervals along the width direction of the tire to divide the tread into two shoulder pattern portions 20 and two middle pattern portions 30 located between the two shoulder pattern portions 20 .

[0037] Specifically, the wear and heat generating area 1 on the tire tread can be obtained through software simulation, that is, the area of ​​the tire mounted on the vehicle body with a higher temperature during the movement of the vehicle body. In fact, during the rolling and driving of the tire, due to the effect of centrifugal force, the contact footprint of the tire will become smaller and mainly concentrated in the central wear and heat generating area 1. Therefore, the sea-land ratio (the ratio of area S1 to area S2) and the pattern structure in the wear and heat generating area 1 have a great influence on the wear resistance and heat dissipation performance of the tread, especially the heat dissipation performance and traction performance under heavy load conditions on harsh roads.

[0038] Specifically, if the sea-to-land ratio (the ratio of area S1 to area S2) is too large, it means that the area of ​​the middle pattern block 31 is too large, which in turn leads to poor heat dissipation performance of the tread. If the sea-to-land ratio (the ratio of area S1 to area S2) is too small, it means that the area of ​​the middle pattern block 31 is too small, and the rigidity of the middle pattern block 31 is too small, which in turn leads to poor wear resistance, puncture resistance and cut resistance of the tread.

[0039] Optionally, there are multiple intermediate pattern parts 30, and in two adjacent intermediate pattern parts 30, the multiple first connecting grooves 40 on one intermediate pattern part 30 are arranged correspondingly to the multiple first connecting grooves 40 on the other intermediate pattern part 30. In this way, the first connecting grooves 40 arranged correspondingly on the two intermediate pattern parts 30 can form an approximately "X"-shaped structure with the longitudinal grooves 10, thereby increasing the air flow speed inside the grooves, so that the heat inside the tread can be quickly taken away by the airflow, further improving the heat dissipation performance and wear resistance and cutting resistance of the tire. At the same time, the grooves of the approximately "X"-shaped structure can also better balance the rigidity of the intermediate pattern part 30, thereby increasing the interaction force between the tire and the driving surface, and improving the handling performance of the tire.

[0040] like Figure 1As shown, the first connecting groove 40 includes a first sub-groove 41, a second sub-groove 42 and a third sub-groove 43 that are interconnected. The second sub-groove 42 is located between the first sub-groove 41 and the third sub-groove 43. The extension direction of the first sub-groove 41 is set at a first angle A1 with the width direction of the tire, the extension direction of the second sub-groove 42 is set at a second angle A2 with the width direction of the tire, and the extension direction of the third sub-groove 43 is set at a third angle A3 with the width direction of the tire. Among them, the first angle A1, the second angle A2 and the third angle A3 satisfy: 4°≤A1≤8°, 52°≤A2≤56°, 4°≤A3≤8°. In this way, the above arrangement makes the first connecting groove 40 in a "Z" shape, so that the first connecting groove 40 can perform rigid balance on the middle pattern portion 30 in both the width direction and the circumferential direction of the tire, so as to further increase the interaction force between the tread and the running surface, thereby improving the handling performance of the tire. At the same time, the above-mentioned setting of the angle ensures that the air can flow smoothly in the first connecting groove 40, thereby increasing the air flow speed in the first connecting groove 40 and improving the heat dissipation performance of the tire.

[0041] In this embodiment, the first angle A1 and the third angle A3 are 6°.

[0042] In this embodiment, the second angle A2 is 54°.

[0043] like Figure 1As shown, the tire tread structure also includes a second connecting groove 50, which is arranged on the shoulder pattern portion 20, one end of the second connecting groove 50 extends into the longitudinal groove 10 adjacent to the shoulder pattern portion 20, and the other end of the second connecting groove 50 extends to the shoulder of the tire to communicate with the side of the tire. The second connecting groove 50 includes a fourth sub-groove 51, a fifth sub-groove 52 and a sixth sub-groove 53 which are interconnected. The fifth sub-groove 52 is located between the fourth sub-groove 51 and the sixth sub-groove 53. The extension direction of the fourth sub-groove 51 is set at a fourth angle A4 with the width direction of the tire. The extension direction of the fifth sub-groove 52 is set at a fifth angle A5 with the width direction of the tire. The extension direction of the sixth sub-groove 53 is set at a sixth angle A6 with the width direction of the tire. The fourth angle A4, the fifth angle A5 and the sixth angle A6 satisfy: 4°≤A4≤8°, 52°≤A5≤56°, 4°≤A6≤8°. In this way, the second connecting groove 50 arranged on the shoulder pattern portion 20 can guide the air in the tread to the side of the tire, further improving the heat dissipation performance of the tire. At the same time, on the one hand, the above-mentioned arrangement makes the second connecting groove 50 have a "Z" shape design, so that the second connecting groove 50 can balance the rigidity of the shoulder pattern portion 20 in the width direction of the tire and the circumferential direction of the tire, thereby increasing the interaction force between the tire and the running surface and improving the handling performance of the tire (especially the steering handling performance. When the vehicle turns, the interaction force between the shoulder pattern portion 20 and the running surface is greater); on the other hand, the angle design ensures that the air can flow smoothly in the second connecting groove 50, thereby increasing the air flow rate and improving the heat dissipation performance of the tire.

[0044] In this embodiment, the fourth angle A4 and the sixth angle A6 are both 6°.

[0045] In this embodiment, the fifth angle A5 is 54°.

[0046] In this embodiment, a plurality of second connecting grooves 50 are also provided on the shoulder pattern portion 20. The plurality of second connecting grooves 50 are provided one-to-one correspondingly to the plurality of first connecting grooves 40. There is an offset distance between the second connecting grooves 50 and the corresponding first connecting grooves 40 in the axial direction of the tire.

[0047] like Figure 1As shown, a plurality of second connecting grooves 50 separate the shoulder pattern portion 20 into a plurality of shoulder pattern blocks 21, and the tire tread structure further comprises a groove 60, at least part of which is arranged on the shoulder pattern block 21, one end of the groove 60 extends to the shoulder of the tire to communicate with the side of the tire, and the other end of the groove 60 extends toward the center plane S of the tire into the middle pattern portion 30 and is arranged at intervals from the center plane S. Among them, the overall extension direction of the groove 60 is arranged at a seventh angle A7 with the width direction of the tire, and the seventh angle A7 satisfies: 10°≤A7≤11°, and the width of the groove 60 gradually decreases in the direction from the shoulder pattern block 21 to the center plane S. In this way, the above-mentioned setting of the groove 60 helps to further balance the rigidity of the shoulder pattern portion 20 and the middle pattern portion 30, and the width gradient design helps to ensure that the middle pattern block 31 in the wear and heat generating area 1 (the area where the tread mainly contacts the driving surface) is more rigid than the shoulder pattern portion 20, so as to further improve the handling performance and traction performance of the tire.

[0048] In this embodiment, the minimum width of the groove 60 is 9 mm to 10 mm, and the maximum width of the groove 60 is 64 mm to 65 mm. In fact, compared with the width design of other groove structures on the tread, the maximum width of the groove 60 is designed to be larger and the width variation distance is large, so that the groove 60 can timely dissipate the heat in the shoulder pattern portion 20 while ensuring that the groove 60 can achieve a good balance of the tread rigidity, thereby further improving the heat dissipation reliability of the tire.

[0049] like Figure 1 As shown, the upper half of the contour line of the groove 60 includes the first straight line, the second straight line and the third straight line, and the lower half of the contour line of the groove 60 includes the fourth straight line and the fifth straight line, the third straight line is connected to the fifth straight line through an arc line, the first straight line is set at 3° to the width direction of the tire, the second straight line is set at 2° to the width direction of the tire, the third straight line is set at 11° to the width direction of the tire, the fourth straight line is set at 3° to the width direction of the tire, and the fifth straight line is set at 11° to the width direction of the tire.

[0050] In this embodiment, the middle tread portion 30 has a width L2, and the portion of the groove 60 located in the middle tread portion 30 has a length l in the width direction of the tire, and the width L2 and the length l satisfy: 0.15L2≤l≤0.5L2. The above arrangement ensures that the groove 60 can balance the rigidity of the middle tread portion 30 and play a heat dissipation function, while preventing the groove 60 from extending into the middle tread portion 30 too long, which would cause it to have too great an impact on the rigidity of the middle tread portion 30, and further improve the functional stability of the groove 60.

[0051] In this embodiment, the plurality of longitudinal grooves 10 include a first longitudinal groove 11 and a second longitudinal groove 12, at least part of the first longitudinal groove 11 coincides with the center plane S of the tire, a plurality of first heat dissipation recesses 111 are arranged on the groove wall of the first longitudinal groove 11, the plurality of first heat dissipation recesses 111 located on one groove wall of the first longitudinal groove 11 are arranged one-to-one with the plurality of first heat dissipation recesses 111 located on another groove wall of the first longitudinal groove 11, a first heat dissipation portion is formed between the first heat dissipation recess 111 and the first heat dissipation recess 111 arranged corresponding thereto, the first longitudinal groove 11 has a width W1, the first heat dissipation portion has a maximum width W2, and the width W1 and the maximum width W2 satisfy: 2.5W1≤W2≤4W2. The longitudinal groove 10 located on one side of the first longitudinal groove 11 is the second longitudinal groove 12, and the second longitudinal groove 12 is arranged in a broken line shape. In this way, the above-mentioned setting of the first heat dissipation part can further improve the heat dissipation performance of the tire, so as to improve the wear resistance and cut resistance of the tire, and the above-mentioned setting of the width W1 and the maximum width W2 ensures that the first heat dissipation part can still play a heat dissipation function during the process of tread extrusion deformation, further improving the heat dissipation performance of the tire. At the same time, the second longitudinal groove 12 in the shape of a broken line can increase the area of ​​the second longitudinal groove 12, further improving the heat dissipation performance of the tire.

[0052] In this embodiment, a second heat dissipation recess 44 is provided on the groove wall of the first connecting groove 40, and the second heat dissipation recess 44 located on one groove wall of the first connecting groove 40 and the second heat dissipation recess 44 located on another groove wall of the first connecting groove 40 surround and form a second heat dissipation portion, the first connecting groove 40 has a width W3, the second heat dissipation portion has a maximum width W4, and the width W3 and the maximum width W4 satisfy: 2.5W3≤W4≤4W3. In this way, the above-mentioned setting of the second heat dissipation portion can further improve the heat dissipation performance of the tire, so as to improve the wear resistance and cutting resistance of the tire, and the above-mentioned setting of the width W3 and the maximum width W4 ensures that the second heat dissipation portion can still play a heat dissipation function during the process of tread extrusion deformation, further improving the heat dissipation performance of the tire.

[0053] Specifically, the principle of the first heat dissipation part and the second heat dissipation part improving the heat dissipation performance of the tire is as follows:

[0054] During the rolling process of the tire, the tread will be periodically extruded and deformed. In fact, for the first longitudinal groove 11 and the first connecting groove 40, when the tread is extruded and deformed, the two groove walls of the first longitudinal groove 11 and the two groove walls of the first connecting groove 40 will fit together, and the airflow in the groove cannot flow. Especially when the tire rolls at a fast speed, the tire heat dissipation performance is greatly affected. Therefore, the first heat dissipation part and the second heat dissipation part are provided in this embodiment. When the groove walls of the first heat dissipation part and the second heat dissipation part fit together, a hole-like structure for heat dissipation can still be formed, thereby improving the heat dissipation performance of the tire and reducing the probability of "thermal delamination" of the tire during high-speed driving. At the same time, the first heat dissipation part and the second heat dissipation part can also increase the interaction force between the tire and the form surface, thereby improving the handling performance of the tire.

[0055] In this embodiment, the first heat dissipation portion and the second heat dissipation portion are arranged in an approximately elliptical shape, which not only improves the appearance of the tire, but also makes the edges of the first heat dissipation portion and the second heat dissipation portion not sharp, reduces the possibility of pattern blocks falling off, and extends the service life of the tire.

[0056] It should be noted that the shapes of the first heat dissipation portion and the second heat dissipation portion are not limited thereto and can be adjusted according to working conditions and usage requirements. Optionally, the first heat dissipation portion and the second heat dissipation portion are circular in design or polygonal in design.

[0057] Specifically, this embodiment realizes the smooth flow of gas in the tread in an integrated manner through the first heat dissipation portion, the second heat dissipation portion, the first longitudinal groove 11 and the first connecting groove 40 with an "X" shape, and the second connecting groove 50 with a "Z" shape design on the shoulder pattern portion 20. And through the limitation of area S1 and area S2, it ensures that the groove area located in the wear heat generating area 1 is large enough as a whole, so as to ensure that the heat dissipation performance of the tire can meet the use requirements of the tire.

[0058] In this embodiment, the width W1 of the first longitudinal groove 11 and the width W3 of the first connecting groove 40 can be designed according to the actual performance of the tire rubber material to ensure that when the tread is extruded and deformed, the two groove walls of the first longitudinal groove 11 and the two groove walls of the first connecting groove 40 will fit each other. In this way, the above arrangement makes the rigidity of the middle pattern portion 30 change in a segmented manner, that is, when the groove walls are not in contact, the middle pattern portion 30 is normally extruded and deformed and generates a large interaction force with the driving surface, thereby improving the handling performance of the tire, and when the groove walls are in contact, the rigidity of the middle pattern portion 30 increases suddenly to improve the wear resistance, cutting resistance and puncture resistance of the middle pattern portion 30. At the same time, the first heat dissipation portion and the second heat dissipation portion can still dissipate heat at this time to avoid heat accumulation, thereby comprehensively improving the heat dissipation performance and wear resistance and cutting resistance of the tire.

[0059] like Figure 7 As shown, in the cross section of the first longitudinal groove 11 having the first heat dissipation portion, the groove wall of the first longitudinal groove 11 includes a first groove wall surface 112 and a second groove wall surface 113 connected to each other, the second groove wall surface 113 is arc-shaped and is arranged away from the groove bottom of the first longitudinal groove 11 relative to the first groove wall surface 112, and the distance between the second groove wall surfaces 113 on the two groove walls of the first longitudinal groove 11 gradually increases in the direction from the groove bottom of the first longitudinal groove 11 to the tread, so as to form the first heat dissipation recess 111 on the two groove walls of the first longitudinal groove 11. In this way, the above arrangement makes the opening of the cross section at the first heat dissipation portion be arranged in a "trumpet-shaped" manner, so as to increase the heat dissipation area and improve the heat dissipation performance, while preventing stones on the running surface from being clamped into the first heat dissipation portion with a larger area, thereby improving the tire's ability to prevent stones from being clamped.

[0060] like Figure 8 As shown, in the cross section of the first longitudinal groove 11 at the first heat dissipation portion, the width w1 at its opening satisfies: 15mm≤w1≤20mm, the diameter R1 of the arc-shaped second groove wall 113 satisfies: 35mm≤R1≤45mm, and the depth G3 satisfies: 40mm≤G3≤50mm.

[0061] like Figure 7 As shown, in the cross section of the first longitudinal groove 11 where the first heat dissipation portion is not provided, the groove wall is a vertical groove wall with a depth of G3, and the overall width W1 is consistent, and the width W1 satisfies: 5mm≤W1≤8mm, and the groove bottom is an arc surface.

[0062] like Figure 8 As shown, in the cross section of the first connecting groove 40 having the second heat dissipation portion, the groove wall of the first connecting groove 40 includes a third groove wall surface 45 and a fourth groove wall surface 46 connected to each other, the fourth groove wall surface 46 is arc-shaped and is arranged away from the groove bottom of the first connecting groove 40 relative to the third groove wall surface 45, and the distance between the fourth groove wall surfaces 46 on the two groove walls of the first connecting groove 40 gradually increases in the direction from the groove bottom of the first connecting groove 40 to the tread, so as to form the second heat dissipation recess 44 on the two groove walls of the first connecting groove 40. In this way, the above arrangement makes the cross section at the third heat dissipation portion present a "trumpet-shaped" design, so as to increase the heat dissipation area and improve the heat dissipation performance, while preventing stones on the running surface from being clamped into the second heat dissipation portion with a larger area, thereby improving the tire's ability to prevent stones from being clamped.

[0063] like Figure 3 As shown, in the cross section of the first connecting groove 40 where the second heat dissipation portion is located, the width W1 at its opening satisfies: 15mm≤W1≤20mm, the diameter R2 of the arc-shaped second groove wall surface 113 satisfies: 10mm≤R2≤45mm, and the depth G4 satisfies: 40mm≤G4≤50mm.

[0064] like Figure 2 As shown, in the cross section where the first connecting groove 40 is not provided with the second heat dissipation portion, the groove wall is a vertical groove wall with a depth of G4, and the overall width W3 is consistent. The width W3 satisfies: 3mm≤W3≤4mm, and the groove bottom is an arc surface.

[0065] In this embodiment, a strip structure reinforcement 70 is provided on the groove bottom of the second longitudinal groove 12, and one groove wall of the second longitudinal groove 12 is connected to the other groove wall of the second longitudinal groove 12 through the strip structure reinforcement 70. Among them, the first connecting groove 40 is staggered with the connecting end of the second longitudinal groove 12 and the strip structure reinforcement 70; and / or, the second connecting groove 50 is staggered with the connecting end of the second longitudinal groove 12 and the strip structure reinforcement 70. In this way, the strip structure reinforcement 70 can improve the anti-stone clamping ability of the second longitudinal groove 12 (the depth of the part provided with the strip structure reinforcement 70 is shallower and less likely to clamp stones), and can also strengthen the groove bottom of the second longitudinal groove 12 to avoid cracking and splitting at the groove bottom of the second longitudinal groove 12, thereby extending the service life of the tire.

[0066] like Figure 1 , Figure 5 and Figure 6 As shown, along the circumference of the tire, the second longitudinal groove 12 between two adjacent grooves 60 has a length L5, and the strip structural reinforcement 70 has a length L6, and the length L5 and the length L6 satisfy: 0.2L5≤L6≤0.25L5. The second longitudinal groove 12 has a depth G1 at the position where the strip structural reinforcement 70 is provided, and the second longitudinal groove 12 has a depth G2 at other positions (where the strip structural reinforcement 70 is not provided), and the depth G1 and the depth G2 satisfy: 13mm≤G2-G1≤24mm. In this way, the above-mentioned size limitation ensures that the strip structural reinforcement 70 has a sufficiently large structural reinforcement performance.

[0067] Specifically, after the tire is inflated, the distance between the shoulder pattern portion 20 and the middle pattern portion 30 (the second longitudinal groove 12) will cause the width of the second longitudinal groove 12 to change irregularly (mainly increase) due to the different growth of the crown. On the one hand, it will cause the second longitudinal groove 12 to be prone to stone clamping; on the other hand, it will cause the groove bottom of the second longitudinal groove 12 to be prone to cracking. Both stone clamping and groove bottom cracking will cause damage to the tire and affect the tire life. The provision of a strip structural reinforcement 70 connecting the two groove walls of the second longitudinal groove 12 can offset the above deformation and enhance the structural strength of the groove bottom, thereby avoiding the occurrence of the above adverse conditions and extending the service life of the tire.

[0068] like Figure 5As shown, in the cross section where the second longitudinal groove 12 is not provided with the strip structural reinforcement 70, the groove wall is a vertical groove wall, the depth G5 satisfies: 40mm≤G5≤50mm, the width w5 is generally consistent and satisfies: 14mm≤w5≤16mm, and the groove bottom is an arc surface.

[0069] like Figure 6 As shown, in the cross section where the first longitudinal groove 11 is provided with the strip-shaped structural reinforcement 70 , the groove wall is a vertical groove wall, and the depth G6 satisfies: G6=0.4H1.

[0070] like Fig. 9 As shown, in the longitudinal cross-sectional view of the strip structure reinforcement 70, the two opposite side surfaces of the strip structure reinforcement 70 are inclined surfaces to form a trapezoidal boss structure, which is beneficial to improving the structural reinforcement capacity of the strip structure reinforcement 70, and the two inclined surfaces are set at a ninth angle A9 with the normal of the strip structure reinforcement 70, and the ninth angle A9 satisfies: 12.5°≤A9≤15°, and chamfers are set at the edges and corners of the strip structure reinforcement 70 and at the connection with the bottom of the groove to avoid the problems of easy wear and easy stone clamping caused by sharp edges.

[0071] Optionally, the shoulder pattern portion 20 has a width L1, the middle pattern portion 30 has a width L2, the tread has a width L3, and the widths L1, L2, and L3 satisfy: 0.225L3≤L1≤0.25L3, 0.25L3≤L2≤0.275L3. In this way, the above arrangement makes the overall rigidity of the shoulder pattern portion 20 and the middle pattern portion 30 more appropriate, so that the tire has higher handling performance on the basis of satisfying the wear resistance, cutting resistance, puncture resistance, and heat dissipation performance of the tire, so as to ensure that the passengers have sufficiently high riding safety.

[0072] like Figure 7As shown, a groove wall of the groove 60 includes a first sub-groove wall 61, a second sub-groove wall 62 and a third sub-groove wall 63 connected in sequence, the second sub-groove wall 62 forms a step surface on the groove wall of the groove 60, the connection between the first sub-groove wall 61 and the second sub-groove wall 62 and the connection between the second sub-groove wall 62 and the third sub-groove wall 63 are both provided with chamfers, and the groove bottom of the groove 60 is arranged in an arc shape. Among them, the extension direction of the first sub-groove wall 61 and the extension direction of the third sub-groove wall 63 are both arranged at an eighth angle A8 with the normal line of the groove 60, and the eighth angle A8 satisfies: 12.5°≤A6≤15°, there is a distance L4 between the first sub-groove wall 61 and the third sub-groove wall 63, and the distance L4 satisfies: 4mm≤L4≤6mm, the depth H1 of the groove 60 satisfies: 70mm≤H1≤85mm, and the height H2 of the first sub-groove wall 61 and the depth H1 satisfy: 0.3H1≤H2≤0.5H1. In this way, on the one hand, the above-mentioned arrangement forms a step structure on the groove wall of the groove 60, so as to increase the area of ​​the groove 60, improve the heat dissipation performance of the tire, reduce the risk of stone clamping of the tire, improve the rigidity of the groove wall, and further extend the service life of the tire; on the other hand, the arc design of the groove bottom, the angle design and the above-mentioned size design are all conducive to reducing the risk of stone clamping of the groove 60.

[0073] In this embodiment, a wear mark 80 is further provided on the groove bottom of the groove 60 , and the wear mark 80 is used to assist users and maintenance personnel in understanding the wear condition of the tread.

[0074] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0075] 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 to separate the tire tread into two shoulder pattern portions and an intermediate pattern portion located between the two shoulder pattern portions, and the first connecting groove is arranged on the intermediate pattern portion, and the first connecting groove is used to connect two adjacent longitudinal grooves. There are a plurality of first connecting grooves, and the plurality of first connecting grooves are arranged at intervals along the circumference of the tire to separate the intermediate pattern portion into a plurality of intermediate pattern blocks, and at least part of the intermediate pattern blocks are located in the wear and heat generating area of ​​the tire, and the wear and heat generating area has an area S1, and the intermediate pattern blocks located in the wear and heat generating area have an area S2, and the area S1 and the area S2 satisfy: 0.75S1≤S2≤0.85S2. In this way, the wear and heat generating area of ​​the tire is actually the core friction and heat accumulation area of ​​the tire during rolling and driving. The tread in the wear and heat generating area is divided into a large number of independent intermediate pattern blocks through the longitudinal grooves and the first connecting grooves, so that the heat generated in the wear and heat generating area can be dissipated through the longitudinal grooves and the first connecting grooves. The above-mentioned setting of area S1 and area S2 ensures that the contact area between the tread in the wear and heat generating area and the running surface is relatively appropriate, which not only enables a sufficiently large friction force to be generated between the tire and the running surface, but also improves the traction performance and handling performance of the tire. It also makes each middle pattern block have good rigidity, thereby improving the wear resistance and cut resistance of the tire tread; on the other hand, it ensures that the groove area size of the wear and heat generating area is relatively appropriate, so that the heat generated by the tire during driving can be dissipated through the grooves in time, thereby improving the heat dissipation performance of the tire, avoiding the problem of accelerated wear caused by heat accumulation on the tread, and further improving the heat dissipation performance and wear resistance and cut resistance of the tire, thereby solving the problem in the prior art that mining dump truck tires cannot take into account the handling performance, heat dissipation performance and wear resistance and cut resistance, thereby extending the service life of the tire.

[0076] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0077] 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.

[0078] 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.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tire tread structure, characterized in that: include: A plurality of longitudinal grooves (10), each of the longitudinal grooves (10) extending in the circumferential direction of the tire, and the plurality of longitudinal grooves (10) being arranged at intervals along the width direction of the tire so as to separate the tread of the tire into two shoulder pattern portions (20) and an intermediate pattern portion (30) located between the two shoulder pattern portions (20); A first connecting groove (40) is provided on the middle tread portion (30), wherein the first connecting groove (40) is used to connect two adjacent longitudinal grooves (10); There are a plurality of first connecting grooves (40), and the plurality of first connecting grooves (40) are arranged at intervals along the circumference of the tire to divide the intermediate pattern portion (30) into a plurality of intermediate pattern blocks (31), and at least part of the intermediate pattern blocks (31) are located in a wear and heat generating area (1) of the tire, the wear and heat generating area (1) has an area S1, and the intermediate pattern blocks (31) located in the wear and heat generating area (1) have an area S2, and the area S1 and the area S2 satisfy the following relationship: 0.75S1≤S2≤0.85S2.

2. The tire tread structure according to claim 1, characterized in that: There are a plurality of intermediate tread portions (30), and in two adjacent intermediate tread portions (30), a plurality of first connecting grooves (40) on one intermediate tread portion (30) and a plurality of first connecting grooves (40) on the other intermediate tread portion (30) are arranged correspondingly.

3. The tire tread structure according to claim 1, characterized in that: The tire tread structure further comprises: The first connecting groove (40) comprises a first sub-groove (41), a second sub-groove (42) and a third sub-groove (43) which are connected to each other, the second sub-groove (42) is located between the first sub-groove (41) and the third sub-groove (43), the extension direction of the first sub-groove (41) and the width direction of the tire form a first angle A1, the extension direction of the second sub-groove (42) and the width direction of the tire form a second angle A2, and the extension direction of the third sub-groove (43) and the width direction of the tire form a third angle A3; Among them, the first angle A1, the second angle A2 and the third angle A3 satisfy the following conditions: 4°≤A1≤8°, 52°≤A2≤56°, 4°≤A3≤8°.

4. The tire tread structure according to claim 1, characterized in that: The tire tread structure further comprises: A second connecting groove (50) is provided on the shoulder pattern portion (20), one end of the second connecting groove (50) extends into the longitudinal groove (10) adjacent to the shoulder pattern portion (20), and the other end of the second connecting groove (50) extends to the shoulder of the tire to communicate with the side of the tire; Wherein, the second connecting groove (50) comprises a fourth sub-groove (51), a fifth sub-groove (52) and a sixth sub-groove (53) which are interconnected, the fifth sub-groove (52) is located between the fourth sub-groove (51) and the sixth sub-groove (53), the extension direction of the fourth sub-groove (51) forms a fourth angle A4 with the width direction of the tire, the extension direction of the fifth sub-groove (52) forms a fifth angle A5 with the width direction of the tire, the extension direction of the sixth sub-groove (53) forms a sixth angle A6 with the width direction of the tire, and the fourth angle A4, the fifth angle A5 and the sixth angle A6 satisfy the following conditions: 4°≤A4≤8°, 52°≤A5≤56°, 4°≤A6≤8°.

5. The tire tread structure according to claim 4, characterized in that: The plurality of second connecting grooves (50) separate the shoulder pattern portion (20) into a plurality of shoulder pattern blocks (21), and the tire tread structure further comprises: A groove (60), at least part of which is arranged on the shoulder pattern block (21), one end of which extends to the shoulder of the tire to communicate with the side of the tire, and the other end of which extends toward the center plane S of the tire into the middle pattern portion (30) and is spaced from the center plane S; The overall extension direction of the groove (60) is arranged at a seventh angle A7 with the width direction of the tire, and the seventh angle A7 satisfies: 10°≤A7≤11°, and the width of the groove (60) gradually decreases in the direction from the shoulder pattern block (21) to the center plane S.

6. The tire tread structure according to claim 5, characterized in that: The middle tread portion (30) has a width L2, and the portion of the groove (60) located in the middle tread portion (30) has a length l in the width direction of the tire, and the width L2 and the length l satisfy: 0.15L2≤l≤0.5L2.

7. The tire tread structure according to claim 4, characterized in that: The plurality of longitudinal grooves (10) include: A first longitudinal groove (11), at least a portion of the first longitudinal groove (11) coincides with a center plane S of the tire, a plurality of first heat dissipation recesses (111) are arranged on the groove wall of the first longitudinal groove (11), the plurality of first heat dissipation recesses (111) located on one groove wall of the first longitudinal groove (11) and the plurality of first heat dissipation recesses (111) located on another groove wall of the first longitudinal groove (11) are arranged one-to-one correspondingly, a first heat dissipation portion is formed between the first heat dissipation recesses (111) and the first heat dissipation recesses (111) arranged correspondingly thereto, the first longitudinal groove (11) has a width W1, the first heat dissipation portion has a maximum width W2, the width W1 and the maximum width W2 satisfy the following relationship: 2.5W1≤W2≤4W2; The longitudinal groove (10) located on one side of the first longitudinal groove (11) is a second longitudinal groove (12), and the second longitudinal groove (12) is arranged in a broken line shape.

8. The tire tread structure according to claim 7, characterized in that: A second heat dissipation recess (44) is provided on the groove wall of the first connecting groove (40), and a second heat dissipation recess (44) located on one groove wall of the first connecting groove (40) and a second heat dissipation recess (44) located on another groove wall of the first connecting groove (40) are surrounded to form a second heat dissipation portion, the first connecting groove (40) has a width W3, the second heat dissipation portion has a maximum width W4, and the width W3 and the maximum width W4 satisfy the following relationship: 2.5W3≤W4≤4W3.

9. The tire tread structure according to claim 8, characterized in that: In a cross section where the first longitudinal groove (11) has the first heat dissipation portion, the groove wall of the first longitudinal groove (11) comprises a first groove wall surface (112) and a second groove wall surface (113) connected to each other, the second groove wall surface (113) is arc-shaped and is arranged away from the groove bottom of the first longitudinal groove (11) relative to the first groove wall surface (112), and along the direction from the groove bottom of the first longitudinal groove (11) to the tread, the distance between the second groove wall surfaces (113) on the two groove walls of the first longitudinal groove (11) gradually increases, so as to form the first heat dissipation recess (111) on the two groove walls of the first longitudinal groove (11) respectively; In a cross section where the first connecting groove (40) has the second heat dissipation portion, the groove wall of the first connecting groove (40) includes a third groove wall surface (45) and a fourth groove wall surface (46) connected to each other, the fourth groove wall surface (46) is arc-shaped and is arranged away from the groove bottom of the first connecting groove (40) relative to the third groove wall surface (45), and along the direction from the groove bottom of the first connecting groove (40) to the tread, the distance between the fourth groove wall surfaces (46) on the two groove walls of the first connecting groove (40) gradually increases, so as to form the second heat dissipation recessed portions (44) on the two groove walls of the first connecting groove (40), respectively.

10. The tire tread structure according to claim 7, characterized in that: A strip-shaped structural reinforcement (70) is provided on the groove bottom of the second longitudinal groove (12), and one groove wall of the second longitudinal groove (12) is connected to another groove wall of the second longitudinal groove (12) through the strip-shaped structural reinforcement (70); Wherein, the first connecting groove (40) is staggered with the connecting end of the second longitudinal groove (12) and the strip structure reinforcement (70); and / or the second connecting groove (50) is staggered with the connecting end of the second longitudinal groove (12) and the strip structure reinforcement (70).

11. The tire tread structure according to claim 1, characterized in that: The shoulder pattern portion (20) has a width L1, the middle pattern portion (30) has a width L2, the tread has a width L3, and the width L1, the width L2, and the width L3 satisfy the following conditions: 0.225L3≤L1≤0.25L3, 0.25L3≤L2≤0.275L3.

12. The tire tread structure according to claim 5, characterized in that: A groove wall of the groove (60) comprises a first sub-groove wall (61), a second sub-groove wall (62) and a third sub-groove wall (63) which are connected in sequence, the second sub-groove wall (62) forms a step surface on the groove wall of the groove (60), the connection between the first sub-groove wall (61) and the second sub-groove wall (62) and the connection between the second sub-groove wall (62) and the third sub-groove wall (63) are both provided with chamfers, and the groove bottom of the groove (60) is arranged in an arc shape; The extension direction of the first sub-groove wall (61) and the extension direction of the third sub-groove wall (63) are both arranged at an eighth angle A8 with the normal of the groove (60), and the eighth angle A8 satisfies: 12.5°≤A8≤15°; there is a distance L4 between the first sub-groove wall (61) and the third sub-groove wall (63), and the distance L4 satisfies: 4mm≤L4≤6mm; the depth H1 of the groove (60) satisfies: 70mm≤H1≤85mm; the height H2 of the first sub-groove wall (61) and the depth H1 satisfy: 0.3H1≤H2≤0.5H1.

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