CN115366583A

CN115366583A - Motorcycle tyre

Info

Publication number: CN115366583A
Application number: CN202211220265.3A
Authority: CN
Inventors: 左艳博; 刘树青; 张少军
Original assignee: Tiumsun Rubber Tire Weihai Co ltd
Current assignee: Tiumsun Rubber Tire Weihai Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2022-11-22

Abstract

The invention discloses a motorcycle tyre, comprising an equatorial plane and a tread band provided with a plurality of grooves for forming a tread pattern. The tread band comprises a central portion astride an equatorial plane and shoulder portions symmetrically arranged on both sides of the central portion, the central portion comprising a first central portion and a second central portion symmetrically arranged on both sides of the first central portion. The tread pattern includes a plurality of modules arranged repeatedly in the tire circumferential direction, and the modules are arranged symmetrically with respect to the equatorial plane, so that the balance of the tire during middle and high speed running can be improved. The module includes: at least one first groove extending from one of the shoulder portions to the other shoulder portion; at least one pair of second grooves, wherein each pair of second grooves is symmetrically arranged in the tire shoulder part; at least one pair of third grooves, each pair of third grooves being symmetrically disposed within the second central portion. The distribution of the three grooves enhances the uniformity and compactness of the grooves on the module, and improves the balance and drainage performance of the tire.

Description

Motorcycle tyre

Technical Field

The invention relates to the technical field of tires, in particular to a motorcycle tire.

Background

The tire is the only part of a motorcycle component which is directly contacted with the road surface, and is mainly used for bearing load, transmitting power required by motorcycle running, enabling the motorcycle to be stably driven, coping with different road conditions and the like, and the pattern of the tire has important influence on the power/braking force performance, the drainage performance, the ground gripping performance, the driving comfort and the driving safety of the motorcycle.

Different types of motorcycles have different riding modes and different use environments, and different tread patterns need to be designed to meet different requirements of different motorcycles so as to meet the driving modes and the use environments of the tires. Taking the rear wheel of a cruising motorcycle as an example, the tire of the cruising motorcycle needs high trafficability during straight running and turning, so that the tire needs to ensure that the tire continuously and stably provides traction and grip for the motorcycle so as to allow optimal power transmission and proper braking action. Of course, such tires must also ensure comfort, driving stability, controllability, directionality, form stability of the vehicle on different roads, high mileage and regular wear. The number, the tread pattern and the shape of the grooves formed on the tread band have a significant influence on the running behaviour of the tyre, and therefore the tread pattern has a significant influence on the performance of the tyre.

For a conventional tire pattern, the water drainage performance and the ground gripping performance of the tire are affected by the groove occupation ratio of the pattern, and the two performances are difficult to satisfy at the same time.

Disclosure of Invention

The invention mainly solves the technical problem of providing the motorcycle tire suitable for the middle and high speed cruising vehicle tire, so that the tire has the main performance of running on the water-accumulated ground, can meet the running requirement on normal road conditions, improves the control stability of the tire, and can improve the drainage performance on the premise of ensuring the ground gripping force.

To achieve the above object, the present invention discloses a motorcycle tire comprising an equatorial plane and a tread band provided with grooves for forming a tread pattern, the tread band comprising an annular central portion crossing the equatorial plane and two annular shoulder portions symmetrically disposed on both sides of the central portion, the central portion comprising an annular first central portion crossing the equatorial plane and two annular second central portions symmetrically disposed on both sides of the first central portion, the tread pattern comprising a plurality of modules repeatedly arranged in a circumferential direction of the tire, the modules being symmetrically disposed with respect to the equatorial plane, comprising:

at least one first groove extending from one of the shoulder portions to the other shoulder portion;

at least one pair of second grooves, each pair of second grooves being arranged in the shoulder portion symmetrically with respect to the equatorial plane;

at least one pair of third grooves, each pair of third grooves being symmetrically disposed in the second central portion with respect to the equatorial plane.

The modules are arranged symmetrically with respect to the equatorial plane, i.e. the tread pattern is arranged symmetrically with respect to the equatorial plane, which improves the balance of the tyre during medium and high speed operation. The distribution of the three grooves enhances the uniformity and compactness of the grooves on the module, and further improves the balance of the running tire and the drainage performance of the tire.

Preferably, said module has a predetermined circumferential length in the circumferential direction of the tyre, said first grooves having a circumferential length equal to the predetermined circumferential length and a first groove axial development not less than 90% of the tread band axial development. The axial widening of the first grooves is not less than 90% of the axial widening of the tread band, and the axial widening of the first grooves is large, so that the drainage performance of the tire can be enhanced.

Preferably, the first groove includes a first arc portion crossing the equatorial plane, and further includes two second arc portions, two third arc portions, two fourth arc portions and two fifth arc portions respectively disposed on two sides of the equatorial plane, and on the same side of the equatorial plane, one end of the second arc portion is connected to the end of the first arc portion and the junction is tangent, the other end of the second arc portion is connected to one end of the third arc portion, one end of the fourth arc portion is connected to the third arc portion and the junction is tangent to form a three-pronged groove, one end of the fifth arc portion is connected to the other end of the fourth arc portion and the junction is tangent, and the other ends of the two third arc portions and the other ends of the two fifth arc portions form four free ends of the first groove. The three-branch type groove can effectively pierce a water film, has a shunting effect on water contacted by the tire, and can effectively improve the drainage performance of the tire; the four free ends of the first groove further improve the drainage performance of the tire.

Preferably, the module further comprises a transverse groove symmetrically arranged with respect to the equatorial plane, the left and right ends of the transverse groove are respectively communicated with the two second grooves, and the transverse groove crosses the first groove through the junction of the second arc portion and the third arc portion. The transverse grooves can damage the water film from the transverse direction, so that the control performance of the tire in rainy days is enhanced, and the transverse grooves are communicated with the first grooves and the second grooves, so that the drainage performance of the tire is further improved.

Preferably, two triangular grooves which are close to an equatorial plane and symmetrically arranged are arranged on the transverse grooves, and one side of each triangular groove is coincided with the transverse groove. The triangular grooves can effectively pierce a water film, so that the control performance of the tire in rainy days is improved, the vibration generated in the running process of the tire can be absorbed, and the control performance of the tire is further improved.

Preferably, the other end of the third arc portion forms a first fist-shaped end and the other end of the fifth arc portion forms a second fist-shaped end. The design of the fist-shaped end part enables water entering the first groove to be discharged from more angles when entering the four free ends respectively, so that the drainage performance of the tread pattern is enhanced.

Preferably, the second groove includes an arc portion, the third groove includes an arc portion, and the third groove and the second groove are located on the same side as the first groove.

Preferably, the circumferential length of the second groove is 35-45% of the predetermined circumferential length, and the circumferential length of the third groove is 40-50% of the predetermined circumferential length. The fourth circumferential length of the longest circumferential length from the third groove to the second groove accounts for 85% -95% of the first circumferential length. The uniformity of the grooves on the module is enhanced, and the drainage performance of the tire is further improved.

Preferably, on the same side of the equatorial plane, the third grooves have a minimum axial widening distance from the second grooves not greater than 3% of the axial widening of the tread band, the first grooves have a minimum distance from the second grooves not less than 23mm, the first grooves have a minimum distance from the third grooves not less than 15mm, and the third grooves have a distance between the end of the second grooves close to the second grooves and the end of the second grooves close to the third grooves not less than 10mm. The uniformity and compactness of the grooves on the modules are enhanced, and the drainage performance and the handling performance of the tire are further improved.

Preferably, the axial widening of the central portion accounts for 35% -45% of the axial widening of the tread band, the axial widening of the first central portion accounts for 15% -30% of the axial widening of the central portion, the proportion of the grooves in the central portion is not more than 12%, the proportion of the grooves in the shoulder portions is not less than 12% and not more than 15%, and the proportion of the Liu Bi in the tread band is not less than 80% and not more than 90%. The grip of the tire can be ensured, and the control stability of the tire is improved.

In conclusion, the beneficial effects of the invention are as follows: the grooves on the tire disclosed by the invention have good uniformity and compactness, the drainage performance and the control performance of the tire are improved, and the drainage performance of the tire can be improved on the premise of ensuring the ground gripping force; the tread patterns are symmetrically arranged relative to the equatorial plane, so that the balance of the tire in middle and high speed running can be improved; the axial widening of the first groove is large enough, so that the drainage performance of the tire can be enhanced; the three-branch groove can effectively improve the drainage performance of the tire; the four free ends of the first groove further improve the drainage performance of the tire; the transverse grooves can damage the water film from the transverse direction, so that the control performance of the tire in rainy days is enhanced, and the transverse grooves are communicated with the first grooves and the second grooves, so that the drainage performance of the tire is further improved; the triangular grooves further improve the handling performance of the tire; the design of the fist-shaped end part strengthens the drainage performance of the tread pattern.

Drawings

FIG. 1 is a schematic development of a tread band of a portion of a motorcycle tyre according to the invention;

FIG. 2 is a cross-sectional view of a motorcycle tire of the present invention taken along the axial direction thereof;

in the figure: 1. tire, 2, tread band, 21, center portion, 211, first center portion, 212, second center portion, 22, shoulder portion, 3, module, 31, first groove, 311, first arc portion, 312, second arc portion, 313, third arc portion, 314, fourth arc portion, 315, fifth arc portion, 316, first fist end, 317, second fist end, 318, three-pronged groove, 32, second groove, 33, third groove, 34, transverse groove, 35, triangular groove, L, predetermined circumferential length, L1, first circumferential length, L2, second circumferential length, L3, third circumferential length, L4, fourth circumferential length, X-X, equatorial plane.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present application, it is to be understood that the terms "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, and are not to be construed as limitations of the present application.

The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "a plurality" means two or more unless otherwise specified.

The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.

The invention discloses a motorcycle tyre, as shown in figures 1 and 2, comprising an equatorial plane X-X and a tread band 2, the equatorial plane X-X dividing the tread band 2 into two symmetrically arranged portions. The tread band 2 is provided with a plurality of grooves for forming a tread pattern, the tread band 2 comprises an annular central portion 21 crossing an equatorial plane X-X and two annular shoulder portions 22 symmetrically arranged at the left and right sides of the central portion 21, the axial widening of the central portion 21 accounts for 35-45% of the axial widening of the tread band 2, the proportion of the grooves in the central portion 21 is not more than 12%, the proportion of the grooves in the shoulder portions 22 is not less than 12% and not more than 15%, and the land ratio of the tread band 2 is not less than 80% and not more than 90%. Liu Bi refers to the ratio of the area of the tread band 2 excluding the grooves to the area of the tread band 2. The central portion 21 comprises a first annular central portion 211 astride the equatorial plane X-X and two second annular central portions 212 symmetrically disposed on either side of the first central portion 211, the axial widening of the first central portion 211 being between 15% and 30% of the axial widening of the central portion 21.

As shown in fig. 1, the tread pattern comprises a plurality of modules 3 arranged repeatedly in the circumferential direction of the tyre 1, the modules 3 being arranged symmetrically with respect to the equatorial plane X-X, i.e. the tread pattern is arranged symmetrically with respect to the equatorial plane X-X. The module 3 has a predetermined circumferential length L in the circumferential direction of the tire 1. The predetermined circumferential length L is the circumferential extension of the module 3 at each point.

The module 3 comprises at least one first groove 31, the first groove 31 extending from one of the shoulder portions 22 to the other shoulder portion 22, the first groove 31 having an axial development not less than 90% of the axial development of the tread band 2. The first groove 31 includes a first arc portion 311 crossing the equatorial plane X-X, and further includes two second arc portions 312, two third arc portions 313, two fourth arc portions 314 and two fifth arc portions 315 respectively disposed on both sides of the equatorial plane X-X, on the same side of the equatorial plane X-X, one end of the second arc portion 312 is connected to and tangent to an end of the first arc portion 311, the other end of the second arc portion 312 is connected to one end of the third arc portion 313, one end of the fourth arc portion 314 is connected to and tangent to the third arc portion 313 to form a three-pronged groove 318, one end of the fifth arc portion 315 is connected to and tangent to the other end of the fourth arc portion 314, and the other ends of the two third arc portions 313 and the other ends of the two fifth arc portions 315 form four free ends of the first groove 31. The three-branch groove 318 can effectively pierce a water film, and can split water that the tire 1 contacts, thereby effectively improving the drainage performance of the tire 1. The other end of the third arc portion 313 forms a first fist shaped end 316 and the other end of the fifth arc portion 315 forms a second fist shaped end 317. The design of the fist-shaped end enables water entering the first groove 31 to be discharged from more angles, thereby enhancing the drainage performance of the tread pattern.

The module 3 further comprises at least one pair of second grooves 32, each pair of second grooves 32 being arranged symmetrically with respect to the equatorial plane X-X in the shoulder portion 22, the second grooves 32 comprising an arc portion. The module 3 further comprises transverse grooves 34 arranged symmetrically with respect to the equatorial plane X-X, the left and right ends of the transverse grooves 34 being respectively in communication with the two second grooves 32, and the transverse grooves 34 crossing the first grooves 31 through the junction of the second arc portion 312 and the third arc portion 313. The lateral grooves 34 can cause damage to the water film from the lateral direction, thereby enhancing the handling performance of the tire 1 in rainy weather. Two triangular grooves 35 which are close to the equatorial plane X-X and are symmetrically arranged are arranged on the transverse grooves 34, and one side of each triangular groove 35 is superposed with the transverse groove 34. The triangular groove 35 can effectively pierce a water film, so that the control performance of the tire 1 in rainy days is improved, the vibration generated in the running process of the tire 1 can be absorbed, and the control performance of the tire 1 is further improved.

The module 3 further comprises at least one pair of third grooves 33, each pair of third grooves 33 being arranged symmetrically with respect to the equatorial plane X-X in the second central portion 212, the third grooves 33 comprising an arc portion, the third grooves 33 and the second grooves 32 being located on the same side as the first grooves 31.

As shown in fig. 1, the first grooves 31 have a circumferential length L1 equal to the predetermined circumferential length L, the second grooves 32 have a circumferential length L2 of 35% to 45% of the predetermined circumferential length L, and the third grooves 33 have a circumferential length L3 of 40% to 50% of the predetermined circumferential length L. The fourth circumferential length L4 of the longest circumferential length from the third groove 33 to the second groove 32 accounts for 85% -95% of the first circumferential length L1. On the same side of the equatorial plane X-X, the third grooves 33 have a minimum axial widening from the second grooves 32 of not more than 3% of the axial widening of the tread band 2, the first grooves 31 have a minimum distance from the second grooves 32 of not less than 23mm, the first grooves 31 have a minimum distance from the third grooves 33 of not less than 15mm, and the third grooves 33 have a distance from the end of the second grooves 32 close to the third grooves 33 of not less than 10mm.

It is worth noting that the motorcycle tire disclosed by the invention can be applied to cruising motorcycles as well as motorcycles of other models.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. Motorcycle tyre comprising an equatorial plane (X-X) and a tread band (2), said tread band (2) being provided with grooves for forming a tread pattern, characterized in that said tread band (2) comprises an annular central portion (21) astride the equatorial plane (X-X) and two annular shoulder portions (22) symmetrically arranged on the left and right sides of the central portion (21), said central portion (21) comprising an annular first central portion (211) astride the equatorial plane (X-X) and two annular second central portions (212) symmetrically arranged on the left and right sides of the first central portion (211), said tread pattern comprising a plurality of modules (3) repeatedly arranged circumferentially along the tyre (1), said modules (3) being symmetrically arranged with respect to the equatorial plane (X-X) and comprising:

at least one first groove (31), said first groove (31) extending from one of the shoulder portions (22) to the other shoulder portion (22);

at least one pair of second grooves (32), each pair of second grooves (32) being arranged symmetrically with respect to the equatorial plane (X-X) in the shoulder portion (22);

at least one pair of third grooves (33), each pair of third grooves (33) being arranged symmetrically with respect to the equatorial plane (X-X) in the second central portion (212).

2. Motorcycle tyre according to claim 1, characterized in that said module (3) has a predetermined circumferential length (L) in the circumferential direction of the tyre (1), said first grooves (31) having a circumferential length first circumferential length (L1) equal to the predetermined circumferential length (L), said first grooves (31) having an axial development not less than 90% of the axial development of the tread band (2).

3. A tyre for motorcycles as claimed in claim 2, wherein said first groove (31) comprises a first arc portion (311) astride the equatorial plane (X-X), and further comprises two second arc portions (312), two third arc portions (313), two fourth arc portions (314) and two fifth arc portions (315) respectively disposed on either side of the equatorial plane (X-X), on the same side of the equatorial plane (X-X), one end of the second arc portion (312) being connected to and tangent to an end of the first arc portion (311), the other end of the second arc portion (312) being connected to an end of the third arc portion (313), one end of the fourth arc portion (314) being connected to and tangent to the third arc portion (313) forming a three-pronged groove (318), one end of the fifth arc portion (315) being connected to and tangent to the other end of the fourth arc portion (314), the other ends of the two third arc portions (313) and the other ends of the two fifth arc portions (315) forming four free ends of the first groove (31).

4. A tyre for motorcycles as claimed in claim 3, wherein said module (3) further comprises transverse grooves (34) arranged symmetrically with respect to the equatorial plane (X-X), said transverse grooves (34) communicating at the left and right ends respectively with the two second grooves (32), and said transverse grooves (34) traversing the first grooves (31) through the junction of the second arc portion (312) and the third arc portion (313).

5. A tyre for motorcycles as claimed in claim 4, wherein said transverse grooves (34) are provided with two triangular grooves (35) symmetrically disposed close to the equatorial plane (X-X), one edge of said triangular grooves (35) coinciding with the transverse grooves (34).

6. A tyre for motorcycles as claimed in claim 3, wherein the other end of said third arc portion (313) forms a first boxed end portion (316) and the other end of said fifth arc portion (315) forms a second boxed end portion (317).

7. A tyre for motorcycles as claimed in claim 1, wherein said second groove (32) comprises an arc portion, said third groove (33) comprises an arc portion, and said third groove (33) and said second groove (32) are located on the same side of said first groove (31).

8. A motorcycle tyre according to claim 7, characterized in that the circumferential length of said second grooves (32), the second circumferential length (L2), is between 35% and 45% of the predetermined circumferential length (L), the circumferential length of said third grooves (33), the third circumferential length (L3), is between 40% and 50% of the predetermined circumferential length (L), and the fourth circumferential length (L4), the longest circumferential length of said third grooves (33) to the second grooves (32), is between 85% and 95% of the first circumferential length (L1).

9. A tyre for motorcycles as claimed in claim 8, wherein on the same side of the equatorial plane (X-X) the third grooves (33) have a minimum axial widening distance from the second grooves (32) not greater than 3% of the axial widening of the tread band (2), the first grooves (31) have a minimum axial widening distance from the second grooves (32) not less than 23mm, the first grooves (31) have a minimum axial widening distance from the third grooves (33) not less than 15mm, and the third grooves (33) have a minimum axial widening distance from the end of the second grooves (32) close to the third grooves (33) not less than 10mm.

10. A tyre for motorcycles as claimed in claim 1, wherein said central portion (21) has an axial development of between 35% and 45% of the axial development of the tread band (2), said first central portion (211) has an axial development of between 15% and 30% of the axial development of the central portion (21), the proportion of grooves present in said central portion (21) being not greater than 12%, the proportion of grooves present in said shoulder portions (22) being not less than 12% and not greater than 15%, and the Liu Bi of said tread band (2) being not less than 80% and not greater than 90%.