Movement performance tire tread pattern structure

Abstract

The invention discloses a tread pattern structure of a tire with movement performance, and relates to the technical field of tires, the tread pattern structure is used on a tread band, and the tread band sequentially comprises a sub-tread band A, a sub-tread band B and a sub-tread band C from the middle to the two sides in the transverse direction; the tread band is formed by combining a plurality of identical tread modules T in the circumferential direction, the tread modules T replicating in the circumferential direction of the tire and having a predetermined circumferential length J; the tread module T comprises a first pattern groove, a second pattern groove and a third pattern groove which are arranged on the opposite sides relative to the equatorial plane X-X of the tire. According to the invention, a plurality of scientific and beautiful pattern grooves are arranged, and the shape, the width, the section and the like of the pattern grooves are designed again, so that the movement performance of the tire is greatly improved.

Description

Technical Field

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

[0002] Tires are the only parts of vehicles (such as motorcycles, electric vehicles, etc.) that are in direct contact with the road surface. Their main functions are to bear the load, transmit the power required for the vehicle to travel, enable the vehicle to drive stably, cope with different road conditions, etc. The tire pattern has an important impact on the vehicle's power / braking performance, drainage performance, grip performance, driving comfort, and driving safety.

[0003] When a vehicle is driving at high speed, its tires need to have grip, drainage, stability and traction on different road surfaces. However, the current tire pattern design has relatively simple functions, and small stones are easily stuck in the tread grooves. At this time, sharp stones may puncture the rubber outer layer of the tire, causing air leakage and affecting driving safety. Secondly, the drainage effect of the tire will be weakened, resulting in weaker grip and braking performance of the tire on wet and slippery roads, and its sports performance is relatively weak. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tread pattern structure of a sports performance tire, which greatly improves the sports performance of the tire by setting a plurality of scientific and beautiful pattern grooves and redesigning the shape, width, cross-section, etc. of the pattern grooves.

[0005] To solve the above technical problems, the technical solution of the present invention is achieved as follows:

[0006] A sports performance tire tread pattern structure is used on the tread belt;

[0007] The tread band includes a sub-tread band A, a sub-tread band B and a sub-tread band C in sequence from the middle to both sides in the transverse direction, wherein the sub-tread band A is the crown area, the sub-tread band B is the shoulder area, and the sub-tread band C is the sidewall area; the sub-tread band A includes a sub-tread band A1 and a sub-tread band A2, the sub-tread band A1 is a predetermined axial width portion of the sub-tread band A with a smaller gap-to-rubber ratio, and the sub-tread band A2 is the other central portion of the sub-tread band A;

[0008] The tread band is composed of a plurality of identical tread modules T in the circumferential direction, which are replicated along the circumferential direction of the tire and have a predetermined circumferential length J; the tread module T comprises a first groove, a second groove and a third groove arranged on opposite sides relative to the equatorial plane XX of the tire;

[0009] The pattern groove 1 is composed of a pattern groove 1a, a pattern groove 1b, and a pattern groove 1c connected and combined with each other; the pattern groove 1a is limited to the sub-tread band B and the sub-tread band C, the pattern groove 1b is limited to the sub-tread band A2 and the sub-tread band B, and the pattern groove 1c is limited to the sub-tread band A2;

[0010] The second pattern groove is composed of the second pattern groove a, the second pattern groove b, the second pattern groove c, and the second pattern groove d connected and combined with each other; the second pattern groove a is limited to the sub-tread band B and the sub-tread band C, the second pattern groove b is limited to the sub-tread band B, the second pattern groove c is limited to the sub-tread band A2, and the third pattern groove d is limited to the sub-tread band A2;

[0011] Pattern groove three is defined on the sub-tread band B.

[0012] As a preferred embodiment of the tread pattern structure of a sports performance tire, the ratio of the sub-tread band A to the entire axial width WT of the tread band is 25%-35%; the ratio of the sub-tread band A1 to the entire axial width of the sub-tread band A is 23%-33%; the void-to-rubber ratio of the sub-tread band A1 is greater than or equal to 97%;

[0013] The ratio of the sub-tread band C to the entire tread band axial width WT is 23%-28%.

[0014] As a preferred embodiment of the tread pattern structure of a sports performance tire, the ratio of the length 30z of the pattern groove of the pattern groove 1 in the circumferential direction to the predetermined circumferential length J of the tread module T is 16%-26%, and the groove width of the pattern groove 1 is limited to 2mm-10mm;

[0015] Among them, the ratio of the length 30cz of the pattern groove c in the circumferential direction to 30z is 27%-37%, and the angle between the pattern groove c and the center line of XX is between 5°-15° (acute angle); the ratio of the length 30bh of the pattern groove b in the axial direction to WT is 21%-31%, and the angle between the pattern groove b and the center line of XX is between 105°-115° (obtuse angle); the ratio of the length 30ah of the pattern groove a in the axial direction to WT is 11%-21%, and the angle between the pattern groove a and the center line of XX is between 22°-32° (acute angle).

[0016] As a preferred embodiment of the tread pattern structure of a sports performance tire, the ratio of the length 31z of the second tread groove in the circumferential direction to the predetermined circumferential length J of the tread module T is 90%-100%, and the width of the second tread groove is limited to 2mm-10mm;

[0017] Among them, the ratio of the length 31dz of the pattern groove IId in the circumferential direction to 30z is 8%-18%, and the angle between the pattern groove IId and the center line of XX is between 6°-16° (acute angle); the ratio of the length 31cz of the pattern groove IIc in the circumferential direction to 31z is 32%-42%, and the angle between the pattern groove IIc and the center line of XX is between 18°-28° (acute angle); the ratio of the length 31bh of the pattern groove IIb in the circumferential direction to WT is 15%-25%, and the angle between the pattern groove IIb and the center line of XX is between 63°-73° (acute angle); the ratio of the length 31ah of the pattern groove IIa in the circumferential direction to WT is 6%-16%, and the angle between the pattern groove IIa and the center line of XX is between 23°-33° (acute angle).

[0018] As a preferred embodiment of the tread pattern structure of a sports performance tire, the ratio of the length of the pattern groove three in the circumferential direction to the axial width WT of the entire tread band is 15%-20%, the angle between the pattern groove three and the XX center line is between 40°-50° (acute angle), and the pattern groove width of the pattern groove three is limited to 2mm-10mm.

[0019] As a preferred embodiment of the tread pattern structure of a sports performance tire, the tread module T further includes a pattern groove 4 arranged on the opposite side relative to the equatorial plane XX of the tire; the pattern groove 4 is composed of a pattern groove 4a, a pattern groove 4b, and a pattern groove 4c connected and combined with each other; the pattern groove 4a is defined on the sub-tread band C, and the pattern groove 4b and the pattern groove 4c are both defined on the sub-tread band B; the ratio of the length 33z of the pattern groove 4 in the circumferential direction to the predetermined circumferential length J of the tread module T is 53%-63%, and the pattern groove width of the pattern groove 4 is limited to 1mm-3mm;

[0020] Among them, the ratio of the length 33cz of the pattern groove four c in the circumferential direction to 33z is 31%-41%, and the angle between the pattern groove four c and the center line of XX is between 18°-28° (acute angle); the ratio of the length 33bh of the pattern groove four b in the circumferential direction to WT is 12%-22%, and the angle between the pattern groove four b and the center line of XX is between 60°-70° (acute angle); the ratio of the length 30ah of the pattern groove four a in the circumferential direction to WT is 6%-16%, and the angle between the pattern groove four a and the center line of XX is between 23°-33° (acute angle).

[0021] As a preferred embodiment of the tread pattern structure of a sports performance tire, the tread module T also includes pattern groove five and pattern groove six arranged on opposite sides relative to the equatorial plane XX of the tire; pattern groove five and pattern groove six are both interconnected with pattern groove two; pattern groove five and pattern groove six are both limited on the sub-tread band A.

[0022] As a preferred embodiment of the tread pattern structure of a sports performance tire, the tread band is applied to a motorcycle tire, and the land ratio of the tire is greater than 70% and less than 80%.

[0023] As a preferred embodiment of the tread pattern structure of a sports performance tire, the cross-sectional shape of the pattern groove on the tread module T is a wedge-shaped dovetail shape that is narrow at the top and wide at the bottom.

[0024] As a preferred embodiment of the tread pattern structure of a sports performance tire, the two side walls of the pattern groove on the tread module T are connected with a plurality of evenly distributed protrusions along the opening direction thereof; the surface of the protrusion is an arc surface.

[0025] After adopting the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The tread module T comprises a pattern groove 1, a pattern groove 2 and a pattern groove 3 arranged on opposite sides relative to the equatorial plane XX of the tire; wherein the pattern groove 1 is composed of a pattern groove 1a, a pattern groove 1b and a pattern groove 1c connected and combined with each other; the pattern groove 2 is composed of a pattern groove 2a, a pattern groove 2b, a pattern groove 2c and a pattern groove 2d connected and combined with each other; these pattern grooves are crisscrossed, which can greatly improve the grip of the tire.

[0027] 2. The tread module T also includes a pattern groove four arranged on the opposite side relative to the equatorial plane XX of the tire; wherein the pattern groove four is composed of a pattern groove four a, a pattern groove four b, and a pattern groove four c connected and combined with each other; by adding the pattern groove four, the grip and stability of the tire are further improved.

[0028] 3. The tread module T also includes a fifth and sixth tread grooves arranged on opposite sides relative to the equatorial plane XX of the tire; by adding the fifth and sixth tread grooves, the tire's grip and stability are further improved, and the drainage capacity is further improved, reducing the risk of sideslip.

[0029] 4. In order to reduce the possibility of stones getting stuck in the tread grooves, the cross-sectional shape of the tread grooves on the tread module T is a wedge-shaped dovetail that is narrow at the top and wide at the bottom. At this time, when the tread grooves contact the wheel surface, the groove openings become narrower due to extrusion, so stones are not easily stuck in the grooves.

[0030] 5. In order to further reduce the possibility of stones getting stuck in the tread grooves, protrusions are set on the two side walls of the tread grooves. The protrusions can effectively block the stones, so that the high-speed rotating tire will not reduce the grip and braking performance due to the stuck stones, thereby improving the tire's sports performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 is a schematic plan view of a tire tread band in Embodiment 1;

[0033] Figure 2 for Figure 1 A partial enlarged view of the middle pattern groove 1;

[0034] Figure 3 for Figure 1 A partial enlarged view of the second middle tread groove;

[0035] Figure 4 for Figure 1 A partial enlarged view of the middle pattern groove three;

[0036] Figure 5 for Figure 1 A partial enlarged view of the middle tread groove four;

[0037] Figure 6 is a cross-sectional view of the tire in Example 1;

[0038] Figure 7 is a cross-sectional view of the pattern groove in the second embodiment;

[0039] Figure 8 It is a cross-sectional view of the pattern groove in the third embodiment. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1, as Figures 1 to 4 , Figure 6 As shown, a tread pattern structure of a sports performance tire is used on a tread band 8, and the tread band 8 is applied to a motorcycle tire 1, and the land ratio of the tire 1 is greater than 70% and less than 80%;

[0042] The tread band 8 includes a sub-tread band A, a sub-tread band B and a sub-tread band C in sequence from the middle to both sides in the transverse direction, wherein the sub-tread band A is the crown area, the sub-tread band B is the shoulder area, and the sub-tread band C is the sidewall area; the sub-tread band A includes a sub-tread band A1 and a sub-tread band A2, the sub-tread band A1 is a predetermined axial width portion of the sub-tread band A with a smaller gap-to-rubber ratio, and the sub-tread band A2 is the other central portion of the sub-tread band A;

[0043] The tread band 8 is composed of a plurality of identical tread modules T in the circumferential direction, which are replicated along the circumferential direction of the tire 1 and have a predetermined circumferential length J; the tread module T comprises a pattern groove 1 30, a pattern groove 2 31 and a pattern groove 32 arranged on opposite sides relative to the equatorial plane XX of the tire 1;

[0044] The pattern groove 1 30 is composed of a pattern groove 1 30a, a pattern groove 1 30b, and a pattern groove 1 30c connected and combined with each other; the pattern groove 1 30a is defined on the sub-tread band B and the sub-tread band C, the pattern groove 1 30b is defined on the sub-tread band A2 and the sub-tread band B, and the pattern groove 1 30c is defined on the sub-tread band A2;

[0045] The second tread groove 31 is composed of a second tread groove 31a, a second tread groove 31b, a second tread groove 31c, and a second tread groove 31d connected and combined with each other; the second tread groove 31a is limited to the sub-tread band B and the sub-tread band C, the second tread groove 31b is limited to the sub-tread band B, the second tread groove 31c is limited to the sub-tread band A2, and the third tread groove 32d is limited to the sub-tread band A2;

[0046] Pattern groove three 32 is defined on the sub-tread band B.

[0047] The ratio of sub-tread band A to the axial width WT of the entire tread band 8 is 25%-35%; the ratio of sub-tread band A1 to the axial width of the entire sub-tread band A is 23%-33%; the void-to-rubber ratio of sub-tread band A1 is greater than or equal to 97%; the ratio of sub-tread band C to the axial width WT of the entire tread band 8 is 23%-28%.

[0048] like Figure 2 As shown, the ratio of the length 30z of the pattern groove 1 30 in the circumferential direction to the predetermined circumferential length J of the tread module T is 16%-26%, and the pattern groove width of the pattern groove 1 30 is limited to 2mm-10mm;

[0049] Among them, the ratio of the length 30cz of the pattern groove 30c in the circumferential direction to 30z is 27%-37%, and the angle between the pattern groove 30c and the center line of XX is between 5°-15° (acute angle); the ratio of the length 30bh of the pattern groove 30b in the axial direction to WT is 21%-31%, and the angle between the pattern groove 30b and the center line of XX is between 105°-115° (obtuse angle); the ratio of the length 30ah of the pattern groove 30a in the axial direction to WT is 11%-21%, and the angle between the pattern groove 30a and the center line of XX is between 22°-32° (acute angle).

[0050] like Figure 3 As shown, the ratio of the length 31z of the second pattern groove 31 in the circumferential direction to the predetermined circumferential length J of the tread module T is 90%-100%, and the width of the second pattern groove 31 is limited to 2mm-10mm;

[0051] Among them, the ratio of the length 31dz of the second pattern groove 31d in the circumferential direction to 30z is 8%-18%, and the angle between the second pattern groove 31d and the center line of XX is between 6°-16° (acute angle); the ratio of the length 31cz of the second pattern groove 31c in the circumferential direction to 31z is 32%-42%, and the angle between the second pattern groove 31c and the center line of XX is between 18°-28° (acute angle); the ratio of the length 31bh of the second pattern groove 31b in the circumferential direction to WT is 15%-25%, and the angle between the second pattern groove 31b and the center line of XX is between 63°-73° (acute angle); the ratio of the length 31ah of the second pattern groove 31a in the circumferential direction to WT is 6%-16%, and the angle between the second pattern groove 31a and the center line of XX is between 23°-33° (acute angle).

[0052] like Figure 4 As shown, the ratio of the length of the pattern groove three 32 in the circumferential direction to the axial width WT of the entire tread band 8 is 15%-20%, the angle between the pattern groove three 32 and the XX center line is between 40°-50° (acute angle), and the groove width of the pattern groove three 32 is limited to 2mm-10mm.

[0053] like Figure 5As shown, the tread module T further includes a pattern groove 24 33 arranged on the opposite side relative to the equatorial plane XX of the tire 1; the pattern groove 24 33 is composed of a pattern groove 24 33a, a pattern groove 24 33b, and a pattern groove 24 33c connected and combined with each other; the pattern groove 24 33a is defined on the sub-tread band C, and the pattern groove 24 33b and the pattern groove 24 33c are both defined on the sub-tread band B; the ratio of the length 33z of the pattern groove 24 33 in the circumferential direction to the predetermined circumferential length J of the tread module T is 53%-63%, and the pattern groove width of the pattern groove 24 33 is limited to 1mm-3mm;

[0054] Among them, the ratio of the length 33cz of the pattern groove four 33c in the circumferential direction to 33z is 31%-41%, and the angle between the pattern groove four 33c and the center line of XX is between 18°-28° (acute angle); the ratio of the length 33bh of the pattern groove four 33b in the circumferential direction to WT is 12%-22%, and the angle between the pattern groove four 33b and the center line of XX is between 60°-70° (acute angle); the ratio of the length 30ah of the pattern groove four 33a in the circumferential direction to WT is 6%-16%, and the angle between the pattern groove four 33a and the center line of XX is between 23°-33° (acute angle).

[0055] like Figure 1 As shown, the tread module T also includes a fifth pattern groove 34 and a sixth pattern groove 35 arranged on opposite sides relative to the equatorial plane XX of the tire 1; the fifth pattern groove 34 and the sixth pattern groove 35 are interconnected with the second pattern groove 31; the fifth pattern groove 34 and the sixth pattern groove 35 are both limited on the sub-tread band A.

[0056] Embodiment 2, as Figure 7 As shown, this embodiment is implemented on the basis of the first embodiment, and the difference between this embodiment and the first embodiment is that the cross-sectional shape of the pattern groove on the tread module T is designed to be a wedge-shaped dovetail shape with a narrow top and a wide bottom. At this time, when the pattern groove contacts the wheel surface, the groove is squeezed and narrowed, so stones are not easily stuck in the groove.

[0057] Embodiment three, as Figure 8 As shown, this embodiment is implemented on the basis of the second embodiment, and the difference between this embodiment and the second embodiment is that: the two side walls of the pattern groove on the tread module T are connected with multiple evenly distributed protrusions along the opening direction thereof; the surface of the protrusion is an arc surface. The protrusion can effectively block stones, so that the high-speed rotating tire will not reduce the grip and braking performance due to the stuck stones, thereby improving the sports performance of the tire.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tread pattern structure of a sports performance tire, used on a tread belt, characterized in that: The tread band includes a sub-tread band A, a sub-tread band B and a sub-tread band C in sequence from the middle to both sides in the transverse direction; the sub-tread band A includes a sub-tread band A1 and a sub-tread band A2, the sub-tread band A1 is a predetermined axial width portion of the sub-tread band A with a smaller gap-to-rubber ratio, and the sub-tread band A2 is the other central portion of the sub-tread band A; The tread band is composed of a plurality of identical tread modules T in the circumferential direction, the tread modules T are replicated along the circumferential direction of the tire and have a predetermined circumferential length J; the tread modules T include a first groove, a second groove and a third groove arranged on opposite sides relative to the equatorial plane XX of the tire; The pattern groove 1 is composed of a pattern groove 1a, a pattern groove 1b, and a pattern groove 1c connected and combined with each other; the pattern groove 1a is limited to the sub-tread band B and the sub-tread band C, the pattern groove 1b is limited to the sub-tread band A2 and the sub-tread band B, and the pattern groove 1c is limited to the sub-tread band A2; The second pattern groove is composed of the second pattern groove a, the second pattern groove b, the second pattern groove c, and the second pattern groove d connected and combined with each other; the second pattern groove a is limited to the sub-tread band B and the sub-tread band C, the second pattern groove b is limited to the sub-tread band B, the second pattern groove c is limited to the sub-tread band A2, and the third pattern groove d is limited to the sub-tread band A2; The pattern groove three is defined on the sub-tread band B.

2. The tread pattern structure of a sports performance tire according to claim 1, characterized in that: The ratio of the sub-tread band A to the entire tread band axial width WT is 25%-35%; the ratio of the sub-tread band A1 to the entire tread band A axial width is 23%-33%; the void-to-rubber ratio of the sub-tread band A1 is greater than or equal to 97%; The ratio of the sub-tread band C to the entire tread band axial width WT is 23%-28%.

3. The tread pattern structure of a sports performance tire according to claim 1, characterized in that: The ratio of the length 30z of the pattern groove 1 in the circumferential direction to the predetermined circumferential length J of the tread module T is 16%-26%, and the pattern groove width of the pattern groove 1 is limited to 2mm-10mm; Among them, the ratio of the length 30cz of the pattern groove c in the circumferential direction to 30z is 27%-37%, and the angle between the pattern groove c and the center line of XX is between 5°-15°; the ratio of the length 30bh of the pattern groove b in the axial direction to WT is 21%-31%, and the angle between the pattern groove b and the center line of XX is between 105°-115°; the ratio of the length 30ah of the pattern groove a in the axial direction to WT is 11%-21%, and the angle between the pattern groove a and the center line of XX is between 22°-32°.

4. The tread pattern structure of a sports performance tire according to claim 3, characterized in that: The ratio of the length 31z of the second tread groove in the circumferential direction to the predetermined circumferential length J of the tread module T is 90%-100%, and the width of the second tread groove is limited to 2mm-10mm; Among them, the ratio of the length 31dz of the pattern groove IId in the circumferential direction to 30z is 8%-18%, and the angle between the pattern groove IId and the center line of XX is between 6°-16°; the ratio of the length 31cz of the pattern groove IIc in the circumferential direction to 31z is 32%-42%, and the angle between the pattern groove IIc and the center line of XX is between 18°-28°; the ratio of the length 31bh of the pattern groove IIb in the circumferential direction to WT is 15%-25%, and the angle between the pattern groove IIb and the center line of XX is between 63°-73°; the ratio of the length 31ah of the pattern groove IIa in the circumferential direction to WT is 6%-16%, and the angle between the pattern groove IIa and the center line of XX is between 23°-33°.

5. The tread pattern structure of a sports performance tire according to claim 4, characterized in that: The ratio of the length of the pattern groove of the third pattern groove in the circumferential direction to the axial width WT of the entire tread band is 15%-20%, the angle between the pattern groove three and the XX center line is between 40°-50°, and the pattern groove width of the third pattern groove is limited to 2mm-10mm.

6. The tread pattern structure of a sports performance tire according to claim 1, characterized in that: The tread module T also includes pattern grooves 24 arranged on opposite sides relative to the equatorial plane XX of the tire; The pattern groove 29 is composed of a pattern groove 29a, a pattern groove 29b, and a pattern groove 29c connected and combined with each other; the pattern groove 29a is limited to the sub-tread band C, and the pattern groove 29b and the pattern groove 29c are both limited to the sub-tread band B; The ratio of the length 33z of the tread groove 4 in the circumferential direction to the predetermined circumferential length J of the tread module T is 53%-63%, and the tread groove width of the tread groove 4 is limited to 1mm-3mm; Among them, the ratio of the length 33cz of the pattern groove four c in the circumferential direction to 33z is 31%-41%, and the angle between the pattern groove four c and the center line of XX is between 18°-28°; the ratio of the length 33bh of the pattern groove four b in the circumferential direction to WT is 12%-22%, and the angle between the pattern groove four b and the center line of XX is between 60°-70°; the ratio of the length 30ah of the pattern groove four a in the circumferential direction to WT is 6%-16%, and the angle between the pattern groove four a and the center line of XX is between 23°-33°.

7. The tread pattern structure of a sports performance tire according to claim 1, characterized in that: The tread module T further comprises a fifth and a sixth tread groove arranged on opposite sides relative to the equatorial plane XX of the tire; The fifth and sixth tread grooves are interconnected with the second tread groove; the fifth and sixth tread grooves are limited on the sub-tread band A.

8. The tread pattern structure of a sports performance tire according to any one of claims 1 to 7, characterized in that: The tread band is applied to a motorcycle tire, and the land ratio of the tire is greater than 70% and less than 80%.

9. The tread pattern structure of a sports performance tire according to claim 8, characterized in that: The cross-sectional shape of the pattern groove on the tread module T is a wedge-shaped dovetail shape that is narrow at the top and wide at the bottom.

10. The tread pattern structure of a sports performance tire according to claim 9, characterized in that: Multiple evenly distributed protrusions are connected to both side walls of the pattern groove on the tread module T along the direction in which the groove is opened; and the surface of the protrusion is an arc surface.

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