Tire

Abstract

The application provides a tire. The tire tread comprises a plurality of tread pattern portions arranged at intervals along the width direction of the tire, and at least one of the tread pattern portions is provided with a groove assembly, which comprises a communication groove, a longitudinal groove and a water absorption groove. The communication groove is arranged on the tread pattern portion and extends to the opposite two sides of the tread pattern portion along the width direction of the tire. The longitudinal groove is arranged on the tread pattern portion, at least part of the longitudinal groove extends along the circumferential direction of the tire, and at least part of the longitudinal groove is in communication with the communication groove. The water absorption groove is arranged on the tread pattern portion and is located at the communication position of the communication groove and the longitudinal groove to absorb and buffer the accumulated water at the communication position. At least part of the communication groove and at least part of the longitudinal groove are arranged in an arc shape. The application effectively solves the problem that the groove structure of the tire in the prior art cannot simultaneously consider the wet land handling performance and comfort of the tire.

Description

Technical Field

[0001] This invention relates to the field of tire technology, and more specifically, to a tire. Background Technology

[0002] Currently, tires, as the only component of a car in contact with the road surface, directly affect the vehicle's driving safety and comfort. Related research shows that once a vehicle's speed exceeds a certain level, the noise generated by the interaction between the tires and the road surface becomes the primary source of vehicle noise. Tire noise mainly includes vibration noise from the impact of tread blocks against the ground, pumping noise from the compression of air within the grooves, and aerodynamic noise from air turbulence between the tire and the road surface. Prolonged exposure to tire noise not only accelerates auditory fatigue and affects ride comfort but also causes various forms of chronic damage to the hearing, nervous system, and cardiovascular system. Furthermore, tire noise is a significant component of urban road noise pollution, continuously disturbing the living environment of residents. Meanwhile, driving safety on wet roads is a core issue in road safety. In rainy weather, a film of water forms between the tires and the road surface. When the vehicle speed reaches a certain level, the dynamic water pressure on the tires is sufficient to lift the tread off the road, causing hydroplaning. This significantly reduces tire grip, prolongs braking distance, and lowers driving safety. Therefore, as the ownership rate of private cars continues to increase, people's requirements for driving experience and driving safety are also being upgraded.

[0003] In existing technologies, tire tread design typically employs increased, deeper, and wider grooves to improve water drainage. These grooves break the water film between the tire and the road surface, enhancing water drainage while also increasing the friction area and ensuring good wet handling. Alternatively, closed grooves, which are not connected to other structures, can reduce pumping noise within the grooves. Adding sound-absorbing foam can further reduce tire noise and improve ride comfort.

[0004] However, increasing the number, depth, and width of grooves inevitably amplifies the pumping noise of airflow within the grooves. While closed grooves can improve the pumping noise of the grooves themselves, they can easily affect the drainage performance of the grooves, making it impossible to reduce tire noise while ensuring the tire's wet handling performance. Furthermore, adding sound-absorbing foam can increase tire production costs and overall weight, reducing tire economy. Summary of the Invention

[0005] The main objective of this invention is to provide a tire that solves the problem that the groove structure of existing tires cannot simultaneously achieve both wet handling and comfort.

[0006] To achieve the above objectives, the present invention provides a tire. The tire tread includes a plurality of tread pattern portions spaced apart along the width direction of the tire. At least one tread pattern portion is provided with a groove assembly. The groove assembly includes: a connecting sipe, disposed on the tread pattern portion, extending at both ends to two opposite sides of the tread pattern portion along the width direction of the tire; a longitudinal sipe, disposed on the tread pattern portion, at least a portion of the longitudinal sipe extending along the circumference of the tire and communicating with the connecting sipe; and a water-absorbing groove, disposed on the tread pattern portion, located at the connection between the connecting sipe and the longitudinal sipe, for absorbing and buffering water accumulation at the connection; wherein at least a portion of the connecting sipe and at least a portion of the longitudinal sipe are arc-shaped.

[0007] Furthermore, there are longitudinal grooves between two adjacent tread patterns; along the direction perpendicular to the tread, the groove depth D1 of the connecting sipe, the groove depth D2 of the longitudinal sipe, the groove depth D3 of the water absorption groove, and the groove depth D4 of the longitudinal groove satisfy the following: 0.5D1≤D2≤0.67D1, 0.5mm≤D3-D2≤0.7mm, 1mm≤D4-D2≤2.5mm; and / or, along the direction perpendicular to the tread, the projection of the water absorption groove on the tread... The water-absorbing groove is arranged in a polygonal shape; or, along the direction perpendicular to the tire tread, the projection of the water-absorbing groove onto the tire tread is circular, and the radius R1 of the circle, the width W1 of the connecting groove and the width W2 of the longitudinal groove satisfy: 2W1≤R1≤2.5W1, 0.5mm≤W1≤1.2mm, 0.5mm≤W2≤1mm; and / or, the groove wall of the water-absorbing groove is set at a first included angle A1 with respect to the normal of the water-absorbing groove, and the first included angle A1 satisfies: 3°≤A1≤7°.

[0008] Furthermore, along the width direction of the tire, the tread pattern has a width W3; the line connecting the two ends of the connecting groove forms a second included angle A2 with the circumferential direction of the tire; wherein, the connecting groove is formed by a first arc shape, and the radius R2, width W3, and second included angle A2 of the first arc shape satisfy: 35°≤A2≤75°. .

[0009] Furthermore, the groove assembly also includes: a support protrusion disposed on the sidewall of the connecting groove and protruding in a direction away from the sidewall of the connecting groove; wherein, there are at least two support protrusions, which are respectively disposed on two sidewalls of the connecting groove, and the at least two support protrusions are staggered along the width direction of the tire.

[0010] Furthermore, along the direction perpendicular to the tire tread, the supporting protrusion has a minimum distance C1 between itself and the outer circumferential surface of the tire, where the minimum distance C1 satisfies: 1mm ≤ C ≤ 2mm; and / or, along the direction perpendicular to the tire tread, the supporting protrusion has a height H1, where the height H1 and the groove depth D1 of the connecting sipe satisfy: 0.31D1 ≤ H1 ≤ 0.35D1; and / or, along the direction perpendicular to the sidewall of the connecting sipe, the protrusion height H2 of the supporting protrusion and the groove width W1 of the connecting sipe satisfy: 0.25W1 ≤ H2≤0.5W1; and / or, along the width direction of the tire, the tread pattern has a width W3, and the supporting protrusion has a length L1, the length L1 and the width W3 satisfy: 0.23W3≤L1≤0.27W3; and / or, along the width direction of the tire, the tread pattern has a width W3, and the minimum distance C2 between the supporting protrusion near the side of the tread pattern and the side of the tread pattern satisfies: 0.123W3≤C2≤0.127W3.

[0011] Furthermore, there are multiple connecting sipes, which are spaced apart along the circumference of the tire to divide the tread pattern into multiple tread pattern blocks; wherein, one of the two adjacent connecting sipes is provided with a longitudinal sipe and is connected to the corresponding longitudinal sipe.

[0012] Furthermore, the longitudinal sipes include a first sipe, a second sipe, and a third sipe connected in sequence. The second sipe is a straight segment, and the first and third sipes are both arc-shaped, with the second arc tangent to the second sipe. Along the circumference of the tire, the end of the first sipe away from the second sipe is spaced apart from one side of the tread pattern, and the end of the third sipe away from the second sipe is spaced apart from the other side of the tread pattern. The second sipe is connected to the connecting sipe.

[0013] Furthermore, along the width direction of the tire, the tread pattern portion has a width W3, the first sipe away from the second sipe has a distance C3 between its end and one side of the tread pattern portion, the third sipe away from the second sipe has a distance C4 between its end and the other side of the tread pattern portion, and the second sipe has a distance C5 between its side and the side of the tread pattern portion. The width W3, distance C3, distance C4, and distance C5 satisfy the following conditions: 0.2W3≤C3≤0.4W3, 0.2W3≤C4≤0.4W3, and 0.33W3≤C5≤0.67W3.

[0014] Furthermore, the tire also includes multiple pitch pattern units arranged sequentially along the circumference of the tire; along the circumference of the tire, there is a distance C6 between the end of the first sipe away from the second sipe and the connecting sipe connected to it, and the distance C6 and the pitch P of the corresponding pitch pattern unit satisfy: 0.33P≤C6≤0.67P; and / or, along the circumference of the tire, there is a distance C7 between the end of the third sipe away from the second sipe and the connecting sipe connected to it, and the distance C7 and the pitch P of the corresponding pitch pattern unit satisfy: 0.33P≤C7≤0.67P; and / or, along the circumferential direction of the tire, the distance C8 between the connecting end of the second sipe and the first sipe and the connecting sipe connected thereto, and the distance C8 and the pitch P of the corresponding pitch tread unit satisfy: 0.2P≤C8≤0.3P; and / or, along the circumferential direction of the tire, the distance C9 between the connecting end of the second sipe and the third sipe and the connecting sipe connected thereto, and the distance C9 and the pitch P of the corresponding pitch tread unit satisfy: 0.2P≤C9≤0.3P.

[0015] Furthermore, the connecting groove is arranged in a first arc shape, and the tread pattern block has a chamfer near the edge of the connecting groove; the chamfer is arranged in a third arc shape, and the radius of the third arc shape is equal to the radius of the first arc shape; wherein, along the direction perpendicular to the tread, the projection width of the chamfer on the tread gradually increases from one end of the connecting groove to the other end, and the maximum value W4 of the projection width of the chamfer on the tread satisfies the following relationship between W1≤W4≤3W1; and / or, along the direction perpendicular to the tread, the chamfer has a depth D5, and the depth D5 satisfies the following relationship: 0.5mm≤D5≤1.5mm.

[0016] According to the technical solution of this invention, the tire tread includes a plurality of tread pattern portions spaced apart along the width direction of the tire. At least one tread pattern portion is provided with a groove assembly. A connecting sipe of the groove assembly is provided on the tread pattern portion, and the two ends of the connecting sipe extend to two opposite sides of the tread pattern portion along the width direction of the tire. A longitudinal sipe is provided on the tread pattern portion, at least a portion of which extends along the circumference of the tire and is connected to the connecting sipe. A water-absorbing groove is provided on the tread pattern portion, located at the connection between the connecting sipe and the longitudinal sipe, to absorb and buffer water accumulated at the connection point; wherein, at least a portion of the connecting sipe and at least a portion of the longitudinal sipe are arc-shaped. In this way, during tire operation, the connecting sipe can drain water accumulated in the tread pattern portion to the two sides of the tread pattern portion, ensuring the tire's water drainage performance. It can also break the water film between the tread pattern portion and the driving surface, increasing the friction area between the tread pattern portion and the driving surface, and ensuring the tire's wet handling performance. Meanwhile, the arc-shaped connecting sipes, compared to wider grooves, extend the time for airflow to exit through the connecting sipes, reducing the airflow speed and volume per unit time. This weakens pump noise and eliminates the need for additional sound-dampening structures, thus reducing tire noise and ensuring driving comfort. Simultaneously, the longitudinal sipes separate the tread pattern from another angle. The arc-shaped longitudinal sipes, in conjunction with the connecting sipes, reduce the rigidity of the tread pattern, allowing it to creep and deform in different directions during contact with the road surface. This improves tire grip while absorbing and cushioning the impact energy between the tread pattern and the road surface, reducing noise generated by tread vibration. This also eliminates the need for additional sound-dampening structures, further reducing tire noise and improving driving comfort. Furthermore, the longitudinal sipes guide water accumulation between the tread pattern areas furthest from the connecting sipes and the road surface into the connecting sipes, increasing friction between the tread pattern and the road surface from another direction, ensuring good water drainage and wet handling. Meanwhile, the water-absorbing groove is located at the connection between the connecting groove and the longitudinal groove. On the one hand, when a large amount of water flows into the connection between the longitudinal groove and the connecting groove, it can instantly absorb and buffer the excess water, reduce the congestion and splashing of water at the connection, ensure the smooth drainage of water, and guarantee the tire's wet handling performance. On the other hand, it can create local expansion in the connecting groove. When the airflow flows from the connecting groove into the larger hole, the airflow suddenly expands and decelerates, and some of the sound energy is converted into internal energy and consumed, further reducing pump noise and improving the tire's driving comfort. This solves the problem that the groove structure of the tire in the existing technology cannot take into account both the tire's wet handling and comfort. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A partial front view of an embodiment of a tire according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 A magnified view of a portion of the image;

[0020] Figure 3 It shows Figure 1 Sectional view at EE in the middle;

[0021] Figure 4 It shows Figure 2 Sectional view at point AA;

[0022] Figure 5 It shows Figure 4 Sectional view at DD in the middle;

[0023] Figure 6 It shows Figure 2 Sectional view at point BB in the middle;

[0024] Figure 7 It shows Figure 2 Sectional view at point CC.

[0025] The above figures include the following reference numerals:

[0026] 1. Tread pattern area; 101. Tread pattern block; 111. Cut corner;

[0027] 2. Longitudinal trenches;

[0028] 10. Connecting tool groove;

[0029] 20. Longitudinal groove; 21. First groove; 22. Second groove; 23. Third groove;

[0030] 30. Absorbent groove;

[0031] 40. Support protrusion. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] In this invention, unless otherwise stated, directional terms such as "up" and "down" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0035] To address the problem that the groove structure of existing tires cannot simultaneously achieve both wet handling and comfort, this application provides a tire.

[0036] like Figures 1 to 7 As shown, the tire tread includes multiple tread pattern portions 1 spaced apart along the width direction of the tire. At least one tread pattern portion 1 is provided with a groove assembly, which includes a connecting sipe 10, a longitudinal sipe 20, and a water-absorbing groove 30. The connecting sipe 10 is provided on the tread pattern portion 1, and its two ends extend to two opposite sides of the tread pattern portion 1 along the width direction of the tire. The longitudinal sipe 20 is provided on the tread pattern portion 1, and at least a portion of the longitudinal sipe 20 extends along the circumference of the tire and is connected to the connecting sipe 10. The water-absorbing groove 30 is provided on the tread pattern portion 1 and is located at the connection between the connecting sipe 10 and the longitudinal sipe 20 to absorb and buffer water accumulated at the connection. At least a portion of the connecting sipe 10 and at least a portion of the longitudinal sipe 20 are arc-shaped.

[0037] Applying the technical solution of this embodiment, the tire tread includes a plurality of tread pattern portions 1 spaced apart along the width direction of the tire. At least one tread pattern portion 1 is provided with a groove assembly. A connecting sipe 10 of the groove assembly is provided on the tread pattern portion 1. Along the width direction of the tire, the two ends of the connecting sipe 10 extend to two opposite sides of the tread pattern portion 1. A longitudinal sipe 20 is provided on the tread pattern portion 1. At least a portion of the longitudinal sipe 20 extends along the circumference of the tire and is connected to the connecting sipe 10. A water-absorbing groove 30 is provided on the tread pattern portion 1. The water-absorbing groove 30 is located at the connection between the connecting sipe 10 and the longitudinal sipe 20 to absorb and buffer water accumulation at the connection. At least a portion of the connecting sipe 10 and at least a portion of the longitudinal sipe 20 are arc-shaped. In this way, during tire operation, the connecting groove 10 can drain water accumulated in the tread pattern 1 to both sides of the tread pattern 1, ensuring the tire's water drainage performance. It can also break the water film between the tread pattern 1 and the driving surface, increasing the friction area between the tread pattern 1 and the driving surface, thus ensuring the tire's wet handling performance. At the same time, the arc-shaped connecting groove 10, compared to a wider groove, can prolong the time for airflow to exit from the connecting groove 10, reducing the airflow speed and discharge volume per unit time, thereby weakening pump noise and eliminating the need for additional noise reduction structures, thus reducing tire driving noise and ensuring tire driving comfort. Meanwhile, the longitudinal sipes 20 can separate the tread pattern 1 from another angle. The arc-shaped longitudinal sipes 20, together with the connecting sipes 10, can reduce the rigidity of the tread pattern 1, allowing the tread pattern 1 to creep and deform in different directions during contact with the driving surface. This improves tire grip and absorbs and buffers the impact kinetic energy between the tread pattern 1 and the driving surface, reducing the noise generated by the vibration of the tread pattern 1. This eliminates the need for additional noise reduction structures, further reducing tire noise and improving driving comfort. Simultaneously, the longitudinal sipes 20 can guide water accumulated between the area of ​​the tread pattern 1 that is further away from the connecting sipes 10 and the driving surface into the connecting sipes 10, and increase the friction between the tread pattern 1 and the driving surface from another direction, ensuring the tire's water drainage performance and wet handling. Meanwhile, the water-absorbing groove 30 is set at the connection between the connecting groove 10 and the longitudinal groove 20. On the one hand, when a large amount of water flows into the connection between the longitudinal groove 20 and the connecting groove 10, it can instantly absorb and buffer the excess water, reduce the congestion and splashing of water flow at the connection, ensure the smooth drainage of water, and guarantee the tire's wet handling performance. On the other hand, it can form an expansion in the local area of ​​the connecting groove 10. When the airflow flows from the connecting groove 10 into the larger hole, the airflow suddenly expands and decelerates, and some of the sound energy is converted into internal energy and consumed, further reducing pump noise and improving the tire's driving comfort. This solves the problem that the groove structure of the tire in the prior art cannot take into account both the tire's wet handling performance and comfort.

[0038] like Figure 1 , Figure 2 , Figure 3 and Figure 7As shown, there is a longitudinal groove 2 between two adjacent tread patterns 1; along the direction perpendicular to the tread, the groove depth D1 of the connecting sipe 10, the groove depth D2 of the longitudinal sipe 20, the groove depth D3 of the water absorption groove 30, and the groove depth D4 of the longitudinal groove 2 satisfy the following: 0.5D1≤D2≤0.67D1, 0.5mm≤D3-D2≤0.7mm, 1mm≤D4-D2≤2.5mm; and / or, along the direction perpendicular to the tread, the projection of the water absorption groove 30 on the tread... The water-absorbing groove 30 is arranged in a polygonal shape; or, along the direction perpendicular to the tire tread, the projection of the water-absorbing groove 30 onto the tire tread is circular, and the radius R1 of the circle, the groove width W1 of the connecting groove 10, and the groove width W2 of the longitudinal groove 20 satisfy: 2W1≤R1≤2.5W1, 0.5mm≤W1≤1.2mm, 0.5mm≤W2≤1mm; and / or, the groove wall of the water-absorbing groove 30 is set at a first included angle A1 with respect to the normal of the water-absorbing groove 30, and the first included angle A1 satisfies: 3°≤A1≤7°. In this way, the connecting groove 10 on the tread pattern 1 drains the water accumulated between the tread pattern 1 and the driving surface into the longitudinal groove 2 on one side of the tread pattern 1, thereby achieving the drainage of water between the tread pattern 1 and the driving surface and ensuring the reliability of tire drainage. Subsequently, the depth D4 of the longitudinal groove 2 is 1.0mm to 2.5mm deeper than the depth D1 of the connecting sipe 10. This ensures that water accumulated between the tread pattern 1 and the driving surface is drained while maintaining a certain rigidity in the tread pattern 1, thus ensuring the stability of the tire tread blocks and the handling stability of the tire. It also allows some of the connecting sipe 10 to remain in place even in the later stages of tire wear to drain water, consistently ensuring good wet handling. Simultaneously, the depth D3 of the water-absorbing groove 30 is 0.5mm to 0.7mm deeper than the depth D2 of the longitudinal sipe 20. This depth difference creates a height difference at the connection point between the longitudinal sipe 20 and the connecting sipe 10, causing the water-absorbing groove 30 to generate a local negative pressure suction effect during tire rolling. This absorbs and buffers excess water when there is a large amount of water in the longitudinal sipe 20 and the connecting sipe 10, ensuring the tire's wet grip and also helping to dissipate sound energy within the buffer grooves, thus reducing tire noise. Meanwhile, the various shapes of the water-absorbing grooves 30 can adapt to different working conditions and usage scenarios, improving the processing flexibility of the workers. Furthermore, the projected circular radius R1 of the water-absorbing groove 30 is 2 to 2.5 times the groove width W1 of the connecting groove 10, ensuring that the water-absorbing groove 30 has sufficient volume to absorb instantaneous water accumulation while reducing additional tread noise or excessive weakening of tread block rigidity caused by an excessively large water-absorbing groove 30, thus ensuring the tire's drainage performance and comfort. Simultaneously, the groove width W1 of the connecting groove 10 is limited to 0.5mm to 1.2mm, resulting in a narrower groove width, reducing the amount of air expelled from the groove per unit time, and suppressing the pumping noise of the connecting groove 10 at the sound source.The width W2 of the longitudinal sipe 20 is limited to 0.5mm to 1.0mm. This ensures smooth drainage of water from the tread pattern 1 and the driving surface to the connecting sipe 10, while also helping to reduce airflow noise. Meanwhile, the wall of the water-absorbing groove 30 is set at a first angle A1 of 3° to 7° with the normal, forming a tapered structure that gradually narrows from top to bottom. This allows the water in the water-absorbing groove 30 to be smoothly discharged along the inclined sidewall when the tire is in contact with the ground, avoiding water flow impact noise caused by right-angled sidewalls. Furthermore, when the tire recovers its deformation after leaving the ground, the tapered structure enables a gradual release of water, effectively suppressing the explosive noise caused by the rapid intake or discharge of a large amount of air-water mixture. On the other hand, compared to the right-angled sidewall configuration, this configuration increases the rigidity of the tread pattern 1, ensuring its wear resistance and handling stability.

[0039] In this embodiment, the polygon can be a square, a rectangle, etc.

[0040] In this embodiment, the groove depth D2 of the longitudinal groove 20 is less than the groove depth D1 of the connecting groove 10.

[0041] Preferably, the width W1 of the connecting groove 10 is 0.6 mm to 1.0 mm.

[0042] Preferably, the groove depth D1 of the connecting groove 10 is 1.0 mm to 1.6 mm shallower than the groove depth D4 of the longitudinal groove 2.

[0043] In this embodiment, the projection of the water-absorbing groove 30 onto the tire surface is circular.

[0044] Preferably, the first included angle A1 is 5°.

[0045] like Figure 2 As shown, the tread pattern 1 has a width W3 along the width direction of the tire. The line connecting the two ends of the connecting groove 10 forms a second angle A2 with the circumferential direction of the tire. The connecting groove 10 is formed by a first arc shape, and the radius R2, width W3, and second angle A2 of the first arc shape satisfy: 35°≤A2≤75°. Thus, the second included angle A2 between the line connecting the two ends of the connecting groove 10 and the circumferential direction of the tire, along with the formula relationship, limits the tilt range of the connecting groove 10. This ensures that the connecting groove 10 has a longer transition time during tire contact, meaning the process from the start of contact to complete contact is relatively smooth, extending the time for air to escape from the connecting groove 10 and reducing the pumping noise of the connecting groove 10. Simultaneously, the shear angle 111 between the edge of the tilted groove and the road surface water film within this angle range is also suitable, enabling it to cut through the water film between the tread pattern 1 and the driving surface with low energy loss, ensuring the tire's wet grip and improving wet handling.

[0046] Preferably, the value of the second included angle A2 is in the range of 45° to 65°.

[0047] like Figure 4 and Figure 5 As shown, the groove assembly also includes support protrusions 40, which are disposed on the sidewall of the connecting groove 10 and protrude in a direction away from the sidewall of the connecting groove 10. There are at least two support protrusions 40, each disposed on one of the two sidewalls of the connecting groove 10, and the at least two support protrusions 40 are staggered along the width direction of the tire. In this way, during the contact between the tire and the driving surface, the tread pattern 1 is compressed and deformed. The support protrusions 40 can form physical support points inside the connecting groove 10, reducing the degree of compression deformation of the connecting groove 10, reducing the risk of the connecting groove 10 closing directly, ensuring the ability of the connecting groove 10 to drain water accumulated between the tread pattern 1 and the driving surface, and ensuring the tire's water drainage performance and wet handling. Meanwhile, at least two support protrusions 40 can be staggered on the two side walls of the connecting groove 10, which not only enhances the physical support of the connecting groove 10 and further reduces the risk of the connecting groove 10 being squeezed, deformed and closed, but also forms a more uniform distribution of support force in the connecting groove 10 compared with the relative arrangement, reducing the problem of excessive local rigidity caused by the support points being concentrated on the same cross section. It is also more conducive to the formation of turbulence around the support protrusions 40 in the connecting groove 10, enhancing the drainage effect, and also helps to interrupt the airflow in the connecting groove 10, thus helping to reduce tire driving noise.

[0048] In this embodiment, two support protrusions 40 are provided, and the two support protrusions 40 are respectively provided close to the end of the connecting knife groove 10, so as to reduce the impact on the drainage performance of the connecting knife groove 10 due to the large number of support protrusions 40.

[0049] In this embodiment, along the direction perpendicular to the side wall of the connecting groove 10, the projection of the supporting protrusion 40 on the side wall of the connecting groove 10 is one of a rectangle, an ellipse, or an oval, preferably an oval.

[0050] like Figure 4 and Figure 5As shown, along the direction perpendicular to the tire tread, the supporting protrusion 40 has a minimum distance C1 between itself and the outer circumferential surface of the tire, and the minimum distance C1 satisfies: 1mm ≤ C ≤ 2mm; and / or, along the direction perpendicular to the tire tread, the supporting protrusion 40 has a height H1, and the height H1 and the groove depth D1 of the connecting sipe 10 satisfy: 0.31D1 ≤ H1 ≤ 0.35D1; and / or, along the direction perpendicular to the sidewall of the connecting sipe 10, the protrusion height H2 of the supporting protrusion 40 and the groove width W1 of the connecting sipe 10 satisfy: 0.25W1. ≤H2≤0.5W1; and / or, along the width direction of the tire, the tread pattern 1 has a width W3, and the support protrusion 40 has a length L1, the length L1 and the width W3 satisfy: 0.23W3≤L1≤0.27W3; and / or, along the width direction of the tire, the tread pattern 1 has a width W3, and the minimum distance C2 between the support protrusion 40 near the side of the tread pattern 1 and the side of the tread pattern 1 satisfies: 0.123W3≤C2≤0.127W3. Thus, the distance C1 between the top of the support protrusion 40 and the outer circumference of the tire is limited to 1mm to 2mm. This makes the position of the support protrusion 40 within the connecting groove 10 more suitable, ensuring that in the early stages of tire wear, when the rubber layer of the tread is thicker, the support protrusion 40 can reduce the risk of the connecting groove 10 closing. It also reduces the risk of the support protrusion 40 being too close to the tread surface and affecting the connecting groove 10 from cutting the water film between the tread pattern 1 and the driving surface, thus ensuring the tire's drainage performance and wet handling. At the same time, the height H1 of the support protrusion 40 in the direction perpendicular to the tread is 0.31 to 0.35 times the depth D1 of the connecting groove 10. This ensures that the support protrusion 40 has a suitable longitudinal dimension in the depth direction of the connecting groove 10 to form a stable support structure, and also avoids occupying too much drainage space due to excessive height. This ensures the smooth flow of water in the vertical direction within the connecting groove 10, thus ensuring the drainage reliability of the connecting groove 10. Meanwhile, the height H2 of the support protrusion 40 along the direction perpendicular to the side wall is 0.25 to 0.5 times the width W1 of the connecting groove 10. This ensures that the support protrusion 40 has a suitable size in the width direction of the connecting groove 10 to support the side wall of the connecting groove 10, reducing the closure phenomenon of the connecting groove 10. It also avoids the problem of occupying the drainage section of the connecting groove 10 or being unable to resist the deformation of the connecting groove 10 due to excessive or insufficient height, thus ensuring the drainage reliability of the connecting groove 10. Meanwhile, the length L1 of the support protrusion 40 is 0.23 to 0.27 times the width W3 of the tread pattern portion 1, and the minimum distance C2 between the support protrusion 40 and the side of the tread pattern portion 1 is 0.123 to 0.127 times W3. This further limits the position of the support protrusion 40 on the connecting groove 10 along the width direction of the tire, ensuring the support performance of the support protrusion 40 while also ensuring the drainage reliability of the connecting groove 10, and ensuring the rationality of the position of the support protrusion 40.

[0051] Preferably, the height H2 of the supporting protrusion 40 is 0.33 times the width W1 of the connecting groove 10.

[0052] Preferably, the length L1 of the support protrusion 40 is 0.25 times the width W3 of the tread pattern portion 1.

[0053] Preferably, the minimum distance C2 between the support protrusion 40 and the side of the tread pattern 1 is 0.125 times the width W3.

[0054] like Figure 1 and Figure 2 As shown, there are multiple connecting grooves 10, which are spaced apart along the circumference of the tire to divide the tread pattern 1 into multiple tread blocks 101. One of the two adjacent connecting grooves 10 has a longitudinal groove 20 connected to it. In this way, the multiple connecting grooves 10 increase the ability to break through the water film between the tread pattern 1 and the driving surface, expanding the drainage area of ​​water accumulated between the tread pattern 1 and the driving surface, thus improving the tire's drainage performance and wet handling. Simultaneously, the multiple connecting grooves 10 divide the tread pattern 1 into multiple tread blocks 101, balancing the rigidity of the tread pattern 1 and improving the tire's driving stability. Meanwhile, only one of the two adjacent connecting sipes 10 is connected to the longitudinal sipe 20. This ensures that the longitudinal sipe 20 guides water from other areas to the connecting sipe 10, while also reducing the impact of the longitudinal sipe 20 on the tread pattern 1. This preserves the overall rigidity of the tread pattern 1 and ensures the tire's handling stability.

[0055] like Figure 2As shown, the longitudinal sipe 20 includes a first sipe 21, a second sipe 22, and a third sipe 23 connected in sequence. The second sipe 22 is a straight segment, while the first sipe 21 and the third sipe 23 are both arranged in a second arc shape, tangent to the second sipe 22. Along the circumference of the tire, the end of the first sipe 21 away from the second sipe 22 is spaced apart from one side of the tread pattern 1, and the end of the third sipe 23 away from the second sipe 22 is spaced apart from the other side of the tread pattern 1. The second sipe 22 is connected to the connecting sipe 10. The arrangement of the first sipe 21, the second sipe 22, and the third sipe 23 creates an S-shaped structure in the longitudinal sipe 20. This S-shaped structure, through the arc of the first sipe 21 and the second sipe 22, weakens the rigidity of the tread pattern 1 from multiple directions, ensuring tire grip while reducing impact noise between the tread pattern 1 and the road surface, thus reducing tire noise and improving driving comfort. The straight section of the second sipe 22 also smoothly guides accumulated water into the connecting sipe 10, ensuring reliable drainage and grip. Furthermore, the second sipe 22 is tangent to both the first sipe 21 and the third sipe 23, ensuring smooth water flow within the longitudinal sipe 20 and further enhancing drainage reliability.

[0056] like Figure 2 As shown, along the width direction of the tire, the tread pattern portion 1 has a width W3. The end of the first sipe 21 away from the second sipe 22 is at a distance C3 from one side of the tread pattern portion 1. The end of the third sipe 23 away from the second sipe 22 is at a distance C4 from the other side of the tread pattern portion 1. The second sipe 22 is at a distance C5 from the side of the tread pattern portion 1. The width W3, distance C3, distance C4, and distance C5 satisfy the following conditions: 0.2W3≤C3≤0.4W3, 0.2W3≤C4≤0.4W3, and 0.33W3≤C5≤0.67W3. In this way, the distance between the first sipe 21 and the second sipe 22 and the side of the tread pattern 1 limits the maximum extension range of the longitudinal sipe 20. This creates a rubber connection between the two ends of the longitudinal sipe 20 and the side of the tread pattern 1, providing a certain rigidity to the edge area of ​​the tread pattern 1. This reduces stress concentration at the edges of the tread pattern 1, lowers the risk of edge chipping and abnormal wear of the tread block 101, and ensures tire wear resistance. Simultaneously, the distance between the second sipe 22 and the side of the tread pattern 1 limits the location of the longitudinal sipe 20, ensuring that it is primarily located in the center of the tread pattern 1. This guarantees that the longitudinal sipe 20 can collect water accumulated between the tread pattern 1 and the driving surface, ensuring reliable tire drainage.

[0057] In this embodiment, both distances C3 and C4 are 0.3W3.

[0058] In this embodiment, the distance C5 is 0.5W3.

[0059] like Figure 1 and Figure 2 As shown, the tire also includes multiple pitch tread units arranged sequentially along the circumference of the tire; along the circumference of the tire, there is a distance C6 between the end of the first sipe 21 away from the second sipe 22 and the connecting sipe 10 connected thereto, and the distance C6 and the pitch P of the corresponding pitch tread unit satisfy: 0.33P≤C6≤0.67P; and / or, along the circumference of the tire, there is a distance C7 between the end of the third sipe 23 away from the second sipe 22 and the connecting sipe 10 connected thereto, and the distance C7 and the pitch P of the corresponding pitch tread unit satisfy: 0.33P≤C6≤0.67P. 0.33P≤C7≤0.67P; and / or, along the tire circumference, there is a distance C8 between the connecting end of the second sipe 22 and the first sipe 21 and the communicating sipe 10 connected thereto, and the distance C8 and the pitch P of the corresponding pitch pattern unit satisfy: 0.2P≤C8≤0.3P; and / or, along the tire circumference, there is a distance C9 between the connecting end of the second sipe 22 and the third sipe 23 and the communicating sipe 10 connected thereto, and the distance C9 and the pitch P of the corresponding pitch pattern unit satisfy: 0.2P≤C9≤0.3P. In this way, multiple pitch pattern units have different natural frequencies, dispersing the impact noise spectrum generated when the tire rolls, reducing the phenomenon of noise energy concentration at specific frequencies when arranged with equal pitch, reducing peak noise, and improving tire driving comfort. Meanwhile, the circumferential distance C6 between the end of the first sipe 21 and the connecting sipe 10 is 0.33 to 0.67 times the corresponding pitch P, and the circumferential distance C7 between the end of the third sipe 23 and the connecting sipe 10 is also 0.33 to 0.67 times the corresponding pitch P. This ensures that the end of the arc-shaped segment of the longitudinal sipe 20 is located approximately in the middle between two adjacent connecting sipes 10 in the circumferential direction. This guarantees that the arc-shaped segment of the longitudinal sipe 20 has sufficient extension length within the pitch to cover the circumferential length of the tread pattern block 101, and ensures the reasonableness of the drainage of water and the cutting range of the tread pattern block 101 by the longitudinal sipe 20. Meanwhile, the distance C8 between the connecting end of the second cutting groove 22 and the first cutting groove 21 and the connecting cutting groove 10 is 0.2 to 0.3 times the corresponding pitch P, and the distance C9 between the connecting end of the second cutting groove 22 and the third cutting groove 23 and the connecting cutting groove 10 is also 0.2 to 0.3 times the corresponding pitch P. This ensures that the straight segment of the longitudinal cutting groove 20 occupies a corresponding portion of the pitch length, guaranteeing that the straight segment of the longitudinal cutting groove 20 has sufficient length to guide the central water accumulation to the connecting cutting groove 10, and also providing sufficient space for the curved segments at both ends to bend smoothly. Furthermore, the above configuration allows the longitudinal cutting groove 20 to adapt and adjust its position according to changes in different pitches, improving the processing flexibility and versatility of the longitudinal cutting groove 20.

[0060] In this embodiment, the tire has three different pitch tread units.

[0061] In this embodiment, both distances C6 and C7 are 0.5W3.

[0062] In this embodiment, the pitch pattern unit includes two adjacent connected grooves 10.

[0063] like Figure 1 , Figure 2 and Figure 6 As shown, the connecting groove 10 is arranged in a first arc shape, and the tread pattern block 101 has a chamfer 111 near the edge of the connecting groove 10; the chamfer 111 is arranged in a third arc shape, and the radius of the third arc shape is equal to the radius of the first arc shape; wherein, along the direction perpendicular to the tread, the projection width of the chamfer 111 on the tread gradually increases from one end of the connecting groove 10 to the other end, and the maximum value W4 of the projection width of the chamfer 111 on the tread satisfies the following relationship between W1≤W4≤3W1 and the groove width W1 of the connecting groove 10; and / or, along the direction perpendicular to the tread, the chamfer 111 has a depth D5, and the depth D5 satisfies the following relationship: 0.5mm≤D5≤1.5mm. In this way, the tread pattern portion 1 has a chamfer 111 near the edge of the connecting sipe 10 that matches the curved shape of the connecting sipe 10. This allows the tread pattern block 101 to have a gradual contact transition when it impacts the driving surface, compared to sharp edges. This disperses the impact energy, reduces the peak impact force, reduces corner impact noise, improves tire ride comfort, reduces stress concentration at the edge of the tread pattern block 101, evens out the stress distribution at the edge of the tread pattern block 101, reduces the degree of chipping and tearing of the tread pattern block 101, and improves tire wear resistance. Meanwhile, the gradually changing width of the chamfer 111 ensures that it is widest at the acute end of the tread block and narrows to zero at the obtuse end. This matches the stress distribution pattern at the edge of the tread block 101, reducing stress concentration at the sharp corners of the tread block 101 through the widest chamfer 111. This reduces tire noise and wear while maintaining the contact area of ​​the tread block 101 to ensure tire handling. Furthermore, the range of values ​​for the chamfer depth D5 ensures the overall rigidity and wear uniformity of the tread block 101.

[0064] In this embodiment, the chamfers 111 at both ends of the connecting groove 10 have opposite gradient directions.

[0065] In this embodiment, the maximum value W4 is 2W1.

[0066] Preferably, the depth D5 is 0.7 mm to 1.2 mm.

[0067] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0068] The tire tread includes multiple tread pattern portions spaced apart along the width of the tire. At least one tread pattern portion has a groove assembly. A connecting sipe of the groove assembly is provided on the tread pattern portion, with both ends of the connecting sipe extending to opposite sides of the tread pattern portion along the width of the tire. Longitudinal sipes are provided on the tread pattern portion, with at least a portion extending circumferentially along the tire and communicating with the connecting sipes. Water-absorbing grooves are provided on the tread pattern portion, located at the junction of the connecting sipes and the longitudinal sipes, to absorb and buffer water accumulated at the junction; wherein at least a portion of the connecting sipes and at least a portion of the longitudinal sipes are arc-shaped. Thus, during tire operation, the connecting sipes can drain water accumulated in the tread pattern portion to both sides of the tread pattern portion, ensuring the tire's water drainage performance. They can also break the water film between the tread pattern portion and the driving surface, increasing the friction area between the tread pattern portion and the driving surface, ensuring the tire's wet handling performance. Meanwhile, the arc-shaped connecting sipes, compared to wider grooves, extend the time for airflow to exit through the connecting sipes, reducing the airflow speed and volume per unit time. This weakens pump noise and eliminates the need for additional sound-dampening structures, thus reducing tire noise and ensuring driving comfort. Simultaneously, the longitudinal sipes separate the tread pattern from another angle. The arc-shaped longitudinal sipes, in conjunction with the connecting sipes, reduce the rigidity of the tread pattern, allowing it to creep and deform in different directions during contact with the road surface. This improves tire grip while absorbing and cushioning the impact energy between the tread pattern and the road surface, reducing noise generated by tread vibration. This also eliminates the need for additional sound-dampening structures, further reducing tire noise and improving driving comfort. Furthermore, the longitudinal sipes guide water accumulation between the tread pattern areas furthest from the connecting sipes and the road surface into the connecting sipes, increasing friction between the tread pattern and the road surface from another direction, ensuring good water drainage and wet handling. Meanwhile, the water-absorbing groove is located at the connection between the connecting groove and the longitudinal groove. On the one hand, when a large amount of water flows into the connection between the longitudinal groove and the connecting groove, it can instantly absorb and buffer the excess water, reduce the congestion and splashing of water at the connection, ensure the smooth drainage of water, and guarantee the tire's wet handling performance. On the other hand, it can create local expansion in the connecting groove. When the airflow flows from the connecting groove into the larger hole, the airflow suddenly expands and decelerates, and some of the sound energy is converted into internal energy and consumed, further reducing pump noise and improving the tire's driving comfort. This solves the problem that the groove structure of the tire in the existing technology cannot take into account both the tire's wet handling and comfort.

[0069] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0070] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tire, characterized in that, The tire tread includes a plurality of tread pattern portions (1) spaced apart along the width direction of the tire, and at least one of the tread pattern portions (1) is provided with a groove assembly, the groove assembly including: A connecting groove (10) is provided on the tread pattern portion (1). Along the width direction of the tire, the two ends of the connecting groove (10) extend to the two opposite sides of the tread pattern portion (1). Longitudinal sipes (20) are provided on the tread pattern portion (1), at least a portion of the longitudinal sipes (20) extend along the circumference of the tire, and at least a portion of the longitudinal sipes (20) are connected to the communicating sipes (10); A water-absorbing groove (30) is provided on the tread pattern (1). The water-absorbing groove (30) is located at the connection between the connecting groove (10) and the longitudinal groove (20) to absorb and buffer the water accumulated at the connection. In this configuration, at least a portion of the connecting groove (10) and at least a portion of the longitudinal groove (20) are arc-shaped.

2. The tire according to claim 1, characterized in that, There is a longitudinal groove (2) between two adjacent tread patterns (1); Along a direction perpendicular to the tread, the groove depth D1 of the connecting sipe (10), the groove depth D2 of the longitudinal sipe (20), the groove depth D3 of the water-absorbing groove (30), and the groove depth D4 of the longitudinal groove (2) satisfy the following: 0.5D1≤D2≤0.67D1, 0.5mm≤D3-D2≤0.7mm, 1mm≤D4-D2≤2.5mm; and / or, Along a direction perpendicular to the tire tread, the projection of the water-absorbing groove (30) onto the tire tread is polygonal; or, Along a direction perpendicular to the tire tread, the projection of the water-absorbing groove (30) onto the tire tread is circular, and the radius R1 of the circle, the groove width W1 of the connecting sipe (10), and the groove width W2 of the longitudinal sipe (20) satisfy: 2W1≤R1≤2.5W1, 0.5mm≤W1≤1.2mm, 0.5mm≤W2≤1mm; and / or, The wall of the water-absorbing groove (30) is set at a first included angle A1 with the normal of the water-absorbing groove (30), and the first included angle A1 satisfies: 3°≤A1≤7°.

3. The tire according to claim 1, characterized in that, Along the width direction of the tire, the tread pattern portion (1) has a width W3; The line connecting the two ends of the connecting groove (10) is set at a second included angle A2 with the circumferential direction of the tire; The connecting groove (10) is arranged in a first arc shape, and the radius R2 of the first arc, the width W3, and the second included angle A2 satisfy: 35°≤A2≤75°. .

4. The tire according to claim 1, characterized in that, The trench assembly further includes: A support protrusion (40) is provided on the side wall of the connecting groove (10) and protrudes in a direction away from the side wall of the connecting groove (10); The support protrusion (40) is at least two, and the at least two support protrusions (40) are respectively disposed on the two side walls of the connecting groove (10), and the at least two support protrusions (40) are staggered along the width direction of the tire.

5. The tire according to claim 4, characterized in that, Along a direction perpendicular to the tire tread, the supporting protrusion (40) has a minimum distance C1 between itself and the outer circumferential surface of the tire, the minimum distance C1 satisfying: 1mm ≤ C ≤ 2mm; and / or, Along a direction perpendicular to the tread, the support protrusion (40) has a height H1, and the height H1 satisfies the following condition with respect to the groove depth D1 of the communicating sipe (10): 0.31D1≤H1≤0.35D1; and / or, Along the direction perpendicular to the sidewall of the connecting groove (10), the protrusion height H2 of the supporting protrusion (40) and the groove width W1 of the connecting groove (10) satisfy 0.25W1≤H2≤0.5W1; and / or, Along the width direction of the tire, the tread pattern portion (1) has a width W3, and the supporting protrusion (40) has a length L1, wherein the length L1 and the width W3 satisfy: 0.23W3≤L1≤0.27W3; and / or, Along the width direction of the tire, the tread pattern portion (1) has a width W3, and the minimum distance C2 between the support protrusion (40) near the side of the tread pattern portion (1) and the side of the tread pattern portion (1) satisfies the following condition: 0.123W3≤C2≤0.127W3.

6. The tire according to claim 1, characterized in that, There are multiple connecting grooves (10), and the multiple connecting grooves (10) are arranged at intervals along the circumference of the tire to divide the tread pattern portion (1) into multiple tread pattern blocks (101). Among them, one of the two adjacent connecting cutter grooves (10) is provided with a longitudinal cutter groove (20) and is connected to the corresponding longitudinal cutter groove (20).

7. The tire according to claim 6, characterized in that, The longitudinal cutting groove (20) includes a first cutting groove (21), a second cutting groove (22) and a third cutting groove (23) connected in sequence. The second cutting groove (22) is arranged in a straight line segment. The first cutting groove (21) and the third cutting groove (23) are both arranged in a second arc shape. The second arc shape is tangent to the second cutting groove (22). Along the circumferential direction of the tire, the first sipe (21) is spaced apart from one side of the tread pattern (1) at one end away from the second sipe (22), the third sipe (23) is spaced apart from one side of the tread pattern (1) at one end away from the second sipe (22), and the second sipe (22) is connected to the connecting sipe (10).

8. The tire according to claim 7, characterized in that, Along the width direction of the tire, the tread pattern portion (1) has a width W3, the first sipe (21) has a distance C3 between one end away from the second sipe (22) and one side of the tread pattern portion (1), the third sipe (23) has a distance C4 between one end away from the second sipe (22) and the other side of the tread pattern portion (1), and the second sipe (22) has a distance C5 between the side of the tread pattern portion (1). The width W3, the distance C3, the distance C4 and the distance C5 satisfy the following: 0.2W3≤C3≤0.4W3, 0.2W3≤C4≤0.4W3, 0.33W3≤C5≤0.67W3.

9. The tire according to claim 7, characterized in that, The tire also includes a plurality of pitch pattern units arranged sequentially along the circumference of the tire; Along the circumferential direction of the tire, there is a distance C6 between the end of the first sipe (21) away from the second sipe (22) and the communicating sipe (10) therewith, and the distance C6 and the pitch P of the corresponding pitch tread unit satisfy: 0.33P≤C6≤0.67P; and / or, Along the circumferential direction of the tire, there is a distance C7 between the end of the third sipe (23) away from the second sipe (22) and the communicating sipe (10) therewith, and the distance C7 and the pitch P of the corresponding pitch tread unit satisfy: 0.33P≤C7≤0.67P; and / or, Along the circumferential direction of the tire, there is a distance C8 between the connecting end of the second sipe (22) and the first sipe (21) and the communicating sipe (10) therewith, and the distance C8 and the pitch P of the corresponding pitch pattern unit satisfy: 0.2P≤C8≤0.3P; and / or, Along the circumferential direction of the tire, there is a distance C9 between the connecting end of the second sipe (22) and the third sipe (23) and the communicating sipe (10) connected thereto. The distance C9 and the pitch P of the corresponding pitch pattern unit satisfy the following condition: 0.2P≤C9≤0.3P.

10. The tire according to claim 6, characterized in that, The connecting groove (10) is arranged in a first arc shape, and the tread pattern block (101) has a chamfer (111) near the edge of the connecting groove (10); the chamfer (111) is arranged in a third arc shape, and the radius of the third arc shape is equal to the radius of the first arc shape; Wherein, along the direction perpendicular to the tread, the projected width of the chamfer (111) on the tread gradually increases from one end of the connecting sipe (10) to the other end, and the maximum value W4 of the projected width of the chamfer (111) on the tread satisfies the following relationship with the groove width W1 of the connecting sipe (10): W1≤W4≤3W1; and / or, Along a direction perpendicular to the tread, the chamfer (111) has a depth D5, which satisfies: 0.5mm≤D5≤1.5mm.

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