Tire

Abstract

The utility model provides a tire, the tire is provided with a tread center groove extending along the circumferential direction of the tire so as to divide the tread of the tire into two tread parts, each tread part is provided with preset patterns, the preset patterns comprise a plurality of longitudinal grooves, the longitudinal grooves are arranged at intervals along the axial direction of the tire, and the longitudinal grooves are arranged at intervals along the axial direction of the tire. The longitudinal grooves comprise a plurality of first linear grooves and a plurality of second linear grooves, the first linear grooves and the second linear grooves are alternately arranged, and a preset included angle between the groove wall of each first linear groove and the groove wall of the adjacent second linear groove is an obtuse angle; each tread part comprises a plurality of tread sub-parts which are sequentially arranged in the circumferential direction of the tire, the length of each tread sub-part in the circumferential direction of the tire is a preset pitch, and the preset pitches of any three adjacent tread sub-parts are different. According to the tire disclosed by the utility model, the problems that a special tire for the trailer wheel in the prior art is difficult to have good ground gripping performance and is relatively low in noise are solved.

Description

Technical Field

[0001] The utility model relates to the field of special tires for trailer wheels, and more specifically, to a tire. Background Art

[0002] With the gradual development of transportation means and the gradual strengthening of the globalization trend, the demand of the automotive and material transportation industries for vehicles and special tires for trailer wheels is increasing. The demand for comprehensive special tires for trailer wheels that balance multiple performances is gradually increasing in the market. The demand for wide-base products for trailer wheels in domestic and foreign trucks is gradually increasing, and the market urgently demands products that balance safety, energy conservation, and comfort.

[0003] For medium or even poor road conditions, there is currently a lack of special tires for trailer wheels in the market that have good grip performance, stone discharge performance, and low noise. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a tire to solve the problem that the special tire for trailer wheels in the prior art is difficult to have good grip performance and low noise.

[0005] To achieve the above object, the utility model provides a tire. The tire has a tread center groove extending along its circumferential direction to divide the tread of the tire into two tread portions. Preset patterns are provided on each tread portion. The preset patterns include: a plurality of longitudinal grooves which are arranged at intervals along the axial direction of the tire. The longitudinal grooves include a plurality of first straight grooves and a plurality of second straight grooves, and the plurality of first straight grooves and the plurality of second straight grooves are arranged alternately. The preset angle between the groove wall of each first straight groove and the groove wall of the adjacent second straight groove is an obtuse angle. Each tread portion includes a plurality of tread sub-portions arranged in sequence along the circumferential direction of the tire. The circumferential length of each tread sub-portion along the tire is a preset pitch, and the preset pitches of any three adjacent tread sub-portions are different.

[0006] Furthermore, the tire has a predetermined plane parallel to its central axis. The projection intersection point of the central axis of the tire and the center line of the tread center groove on the predetermined plane is the rotational symmetry center, and the preset patterns on each tread portion are centrosymmetrically arranged with respect to the rotational symmetry center.

[0007] Furthermore, the preset pitch of each tread sub-portion is any one of three different pitch lengths. The three pitch lengths are the first pitch length, the second pitch length, and the third pitch length respectively. Among the plurality of tread sub-portions, at least one tread sub-portion has a pitch length of the first pitch length, at least one tread sub-portion has a pitch length of the second pitch length, and at least one tread sub-portion has a pitch length of the third pitch length. Among them, the first pitch length, the second pitch length, and the third pitch length decrease successively.

[0008] Further, the value range of the preset included angle is from 144° to 148°; the value range of the groove width of each longitudinal groove is from 14 mm to 17 mm.

[0009] Further, along the width direction of each longitudinal groove, each longitudinal groove has a first groove wall and a second groove wall arranged oppositely. The first groove wall extends along a first preset broken line segment, and the second groove wall extends along a second preset broken line segment. The first groove wall is arranged away from the tread center groove relative to the second groove wall. The first preset broken line segment includes a plurality of first straight line segments and second straight line segments connected in sequence, and the plurality of first straight line segments and the plurality of second straight line segments are arranged alternately. The included angle between the second groove wall and the mid-perpendicular plane of the groove bottom of the longitudinal groove is a first preset included angle θ1. The second preset broken line segment includes a plurality of third straight line segments and fourth straight line segments connected in sequence, and the plurality of third straight line segments and the plurality of fourth straight line segments are arranged alternately. The included angle between the first groove wall and the mid-perpendicular plane of the groove bottom of the longitudinal groove is a second preset included angle θ2. The first preset included angle θ1 is less than the second preset included angle θ2, and the value range of the difference angle β1 between the first preset included angle θ1 and the second preset included angle θ2 is 2° ≤ β1 ≤ 4°.

[0010] Further, there are two longitudinal grooves. The longitudinal groove closer to the tread center groove among the two longitudinal grooves is the first longitudinal groove, and the longitudinal groove farther from the tread center groove is the second longitudinal groove. The second preset included angle θ2 of the second longitudinal groove is greater than the second preset included angle θ2 of the first longitudinal groove, and the value range of the difference angle β2 between the second preset included angle θ2 of the second longitudinal groove and the second preset included angle θ2 of the first longitudinal groove is 2° ≤ β2 ≤ 4°; the first preset included angle θ1 of the second longitudinal groove is greater than the first preset included angle θ1 of the first longitudinal groove, and the value range of the difference angle β3 between the first preset included angle θ1 of the second longitudinal groove and the first preset included angle θ1 of the first longitudinal groove is 2° ≤ β3 ≤ 4°.

[0011] Further, through grooves are also provided on the tire. There are a plurality of through grooves, and the plurality of through grooves are arranged at intervals along the circumferential direction of the tire on the tire shoulder.

[0012] Further, the preset pattern further includes short transverse grooves. The short transverse grooves communicate with the first groove wall of the second longitudinal groove. Short transverse grooves are provided at the intersection of the first straight line segment and the second straight line segment away from the tire shoulder. There are a plurality of short transverse grooves, and the plurality of short transverse grooves are arranged at intervals along the circumferential direction of the tire.

[0013] Further, the preset pattern further includes narrow longitudinal grooves. The narrow longitudinal grooves are arranged between the first longitudinal groove and the second longitudinal groove. The narrow longitudinal grooves include a plurality of third straight grooves and fourth straight grooves arranged in sequence, and each third straight groove and each fourth straight groove are arranged alternately. The included angle between the groove wall of each third straight groove and the groove wall of the adjacent fourth straight groove is an obtuse angle.

[0014] Further, the preset pattern further includes a first long transverse groove, a second long transverse groove, and a third long transverse groove. The first end of the first long transverse groove is connected to and communicates with the tread center groove, and the second end of the first long transverse groove is connected to and communicates with the second groove wall of the first longitudinal groove. Along the direction from the first end to the second end of the first long transverse groove, the groove width of the first long transverse groove gradually increases; the first end of the second long transverse groove is connected to and communicates with the first groove wall of the first longitudinal groove, and the second end of the second long transverse groove is connected to and communicates with one groove wall of the narrow longitudinal groove. Along the direction from the first end to the second end of the second long transverse groove, the groove width of the first long transverse groove gradually decreases; the first end of the third long transverse groove is connected to and communicates with the other groove wall of the narrow longitudinal groove, and the second end of the third long transverse groove is connected to and communicates with the second groove wall of the second longitudinal groove. Along the direction from the first end to the second end of the third long transverse groove, the groove width of the first long transverse groove gradually increases.

[0015] Applying the technical solution of the present invention, the tire has a tread center groove extending along its circumferential direction, which divides the tread of the tire into two tread parts. Preset patterns are provided on each tread part. The preset pattern includes: a plurality of longitudinal grooves, and the longitudinal grooves include a plurality of first straight grooves and a plurality of second straight grooves. The plurality of first straight grooves and the plurality of second straight grooves are alternately arranged. The preset angle between the groove walls of each first straight groove and the groove walls of the adjacent second straight groove is an obtuse angle. The tire with the above longitudinal grooves can generate stronger grip than the straight pattern grooves on the premise of ensuring stability when the vehicle is driving straight; each tread part includes a plurality of tread sub-parts arranged in sequence along the circumferential direction of the tire. The length of each tread sub-part along the circumferential direction of the tire is a preset pitch, and the preset pitches of any three adjacent tread sub-parts are different. The three different preset pitches are arranged irregularly along the circumferential direction of the tire, which can reduce the noise peak value of the tire and improve the driving experience when the tire is running. Therefore, the tire of the present invention can have good grip performance and low driving noise, thus solving the problem that the special tire for trailer wheels in the prior art is difficult to have good grip performance and low noise. Description of the Drawings

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

[0017] Figure 1 shows a schematic structural diagram of a tire according to the present invention;

[0018] Figure 2 shows a cross-sectional view schematic diagram of the longitudinal groove of a tire according to the present invention.

[0019] Among them, the above-mentioned drawings include the following reference numerals:

[0020] 10. Tread center groove; 20. Longitudinal groove; 21. First groove wall; 22. Second groove wall; 23. First straight segment; 24. Second straight segment; 25. First longitudinal groove; 26. Second longitudinal groove; 27. Third straight segment; 28. Fourth straight segment; 30. Through groove; 40. Short transverse groove; 50. Narrow longitudinal groove; 61. First long transverse groove; 62. Second long transverse groove; 63. Third long transverse groove; 7. Shoulder tread block; 8. Secondary tread block; 9. Intermediate tread block. Detailed implementation manners

[0021] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0024] Please refer to Figure 1 and Figure 2, the present utility model provides a tire. The tire has a tread center groove 10 extending along its circumferential direction to divide the tread of the tire into two tread portions. A preset pattern is provided on each tread portion. The preset pattern includes: a plurality of longitudinal grooves 20. The plurality of longitudinal grooves 20 are arranged at intervals along the axial direction of the tire. The longitudinal groove 20 includes a plurality of first straight grooves and a plurality of second straight grooves. The plurality of first straight grooves and the plurality of second straight grooves are arranged alternately. The preset angle between the groove walls of each first straight groove and the groove walls of the adjacent second straight groove is an obtuse angle; each tread portion includes a plurality of tread sub-portions arranged in sequence along the circumferential direction of the tire. The length of each tread sub-portion along the circumferential direction of the tire is a preset pitch. The preset pitches of any three adjacent tread sub-portions are different.

[0025] The tire of the present utility model has a tread center groove 10 extending along its circumferential direction to divide the tread of the tire into two tread portions. A preset pattern is provided on each tread portion. The preset pattern includes: a plurality of longitudinal grooves 20. The longitudinal groove 20 includes a plurality of first straight grooves and a plurality of second straight grooves. The plurality of first straight grooves and the plurality of second straight grooves are arranged alternately. The preset angle between the groove walls of each first straight groove and the groove walls of the adjacent second straight groove is an obtuse angle. The tire with the above longitudinal groove 20 can generate stronger grip than the straight pattern groove on the premise of ensuring stability when the vehicle is driving straight; each tread portion includes a plurality of tread sub-portions arranged in sequence along the circumferential direction of the tire. The length of each tread sub-portion along the circumferential direction of the tire is a preset pitch. The preset pitches of any three adjacent tread sub-portions are different. The three different preset pitches are arranged irregularly along the circumferential direction of the tire, which can reduce the noise peak value of the tire and improve the driving experience when the tire is running. Therefore, the tire of the present utility model can have good grip performance and low driving noise, thus solving the problem that the special tire for trailer wheels in the prior art is difficult to have good grip performance and low noise.

[0026] Specifically, the tire of the present utility model is a special tire for trailer wheels and is applicable to truck vehicles.

[0027] In this embodiment, the tire has a predetermined plane parallel to its central axis. The projection intersection point of the central axis of the tire and the center line of the tread center groove 10 on the predetermined plane is the rotation symmetry center. The preset pattern on each tread portion is centrosymmetrically arranged with respect to the rotation symmetry center.

[0028] Specifically, such a setting helps to avoid the risk of incorrect tire installation direction during the actual use of the tire.

[0029] In this embodiment, the preset pitch of each tread surface portion is any one of three different pitch lengths, namely the first pitch length, the second pitch length, and the third pitch length. Among the multiple tread surface portions, at least one tread surface portion has a pitch length of the first pitch length, at least one tread surface portion has a pitch length of the second pitch length, and at least one tread surface portion has a pitch length of the third pitch length. Among them, the first pitch length, the second pitch length, and the third pitch length decrease successively.

[0030] Specifically, by using the finite element NVH simulation analysis and design method, the preset pitches of three different lengths are arranged, and the tread surface portions with three different preset pitches are arranged irregularly along the tire circumference, which can better reduce the noise peak value and improve the driving experience of the tire.

[0031] In this embodiment, the value range of the preset angle is from 144° to 148°; the value range of the groove width of each longitudinal groove 20 is from 14 mm to 17 mm.

[0032] Specifically, the value range of the preset angle is from 144° to 148°. Such a setting enables the tire to generate stronger grip than the straight pattern groove while ensuring stability. The design of the obtuse angle of the zigzag groove can reduce the risk of air pockets and lack of glue during the tire molding and vulcanization production process, reduce the probability of defective products or appearance rework tires, and reduce the labor and time costs of tire production.

[0033] Specifically, the value range of the groove width of each longitudinal groove 20 is from 14 mm to 17 mm, which helps to improve the drainage performance of the tire.

[0034] In this embodiment, along the width direction of each longitudinal groove 20, each longitudinal groove 20 has a first groove wall 21 and a second groove wall 22 arranged oppositely. The first groove wall 21 extends along a first preset broken line segment, and the second groove wall 22 extends along a second preset broken line segment. The first groove wall 21 is arranged away from the center groove 10 of the tread surface relative to the second groove wall 22. The first preset broken line segment includes a plurality of first straight line segments 23 and second straight line segments 24 connected in sequence, and the plurality of first straight line segments 23 and the plurality of second straight line segments 24 are arranged alternately. The included angle between the second groove wall 22 and the mid-perpendicular plane of the bottom of the longitudinal groove 20 is a first preset angle θ1. The second preset broken line segment includes a plurality of third straight line segments 27 and fourth straight line segments 28 connected in sequence, and the plurality of third straight line segments 27 and the plurality of fourth straight line segments 28 are arranged alternately. The included angle between the first groove wall 21 and the mid-perpendicular plane of the bottom of the longitudinal groove 20 is a second preset angle θ2. The first preset angle θ1 is less than the second preset angle θ2, and the value range of the difference angle β1 between the first preset angle θ1 and the second preset angle θ2 is 2° ≤ β1 ≤ 4°.

[0035] In this embodiment, there are two longitudinal grooves 20. Among the two longitudinal grooves 20, the longitudinal groove 20 closer to the tread center groove 10 is the first longitudinal groove 25, and the longitudinal groove 20 farther from the tread center groove 10 is the second longitudinal groove 26. The second preset angle θ2 of the second longitudinal groove 26 is greater than the second preset angle θ2 of the first longitudinal groove 25. The value range of the difference angle β2 between the second preset angle θ2 of the second longitudinal groove 26 and the second preset angle θ2 of the first longitudinal groove 25 is 2° ≤ β2 ≤ 4°. The first preset angle θ1 of the second longitudinal groove 26 is greater than the first preset angle θ1 of the first longitudinal groove 25. The value range of the difference angle β3 between the first preset angle θ1 of the second longitudinal groove 26 and the first preset angle θ1 of the first longitudinal groove 25 is 2° ≤ β3 ≤ 4°.

[0036] Specifically, such a setting can optimize the inclination angles of the first groove wall 21 and the second groove wall 22 of the first longitudinal groove 25 and the second longitudinal groove 26, improve the wet performance of the tire, and effectively prevent the first longitudinal groove 25 and the second longitudinal groove 26 from clamping stones under medium road conditions, thereby improving the stone discharging performance of the tire of the present utility model.

[0037] Specifically, the arrangement of the preset pattern is relatively compact, increasing the saturation of the preset pattern, enhancing the abrasion resistance of the tire, improving the overall rigidity of the preset pattern, reducing the rolling resistance, reducing the fuel consumption during vehicle driving, and reducing the waste of non-renewable resources.

[0038] In this embodiment, a plurality of through grooves 30 are further provided on the tire. The plurality of through grooves 30 are arranged at intervals along the circumferential direction of the tire on the tire shoulders.

[0039] Specifically, the shoulder of the tire is a closed shoulder structure, which improves the rigidity of the tire shoulder. The through groove 30 is an oval hollow design, which can effectively reduce the heat generation of the tire shoulder and reduce tire damage such as shoulder void and shoulder crack caused by excessive heat generation of the tire shoulder.

[0040] In this embodiment, the preset pattern further includes short transverse grooves 40. The short transverse grooves 40 communicate with the first groove wall 21 of the second longitudinal groove 26. Short transverse grooves 40 are provided at the intersection of the first straight line segment 23 and the second straight line segment 24 away from the tire shoulder. There are a plurality of short transverse grooves 40, and the plurality of short transverse grooves 40 are arranged at intervals along the circumferential direction of the tire.

[0041] Specifically, such a setting makes the corner of the second longitudinal groove 26 transition smoothly, which can help the shoulder of the tire dissipate heat and reduce the rolling resistance of the tire.

[0042] In this embodiment, the preset pattern further includes a narrow longitudinal groove 50. The narrow longitudinal groove 50 is disposed between the first longitudinal groove 25 and the second longitudinal groove 26. The narrow longitudinal groove 50 includes a plurality of third straight grooves and fourth straight grooves arranged in sequence. Each third straight groove and each fourth straight groove are alternately arranged, and the included angle between the groove wall of each third straight groove and the groove wall of the adjacent fourth straight groove is an obtuse angle.

[0043] Specifically, both the narrow longitudinal groove 50 and the tread center groove 10 can enhance the grip of the tire under poor road conditions and enhance the wet performance of the tire. Among them, the shapes of the tread center groove 10 and the narrow longitudinal groove 50 are the same.

[0044] In this embodiment, the preset pattern further includes a first long transverse groove 61, a second long transverse groove 62, and a third long transverse groove 63. The first end of the first long transverse groove 61 is connected to and communicates with the tread center groove 10. The second end of the first long transverse groove 61 is connected to and communicates with the second groove wall 22 of the first longitudinal groove 25. Along the direction from the first end to the second end of the first long transverse groove 61, the groove width of the first long transverse groove 61 gradually increases. The first end of the second long transverse groove 62 is connected to and communicates with the first groove wall 21 of the first longitudinal groove 25. The second end of the second long transverse groove 62 is connected to and communicates with one groove wall of the narrow longitudinal groove 50. Along the direction from the first end to the second end of the second long transverse groove 62, the groove width of the first long transverse groove 61 gradually decreases. The first end of the third long transverse groove 63 is connected to and communicates with the other groove wall of the narrow longitudinal groove 50. The second end of the third long transverse groove 63 is connected to and communicates with the second groove wall 22 of the second longitudinal groove 26. Along the direction from the first end to the second end of the third long transverse groove 63, the groove width of the first long transverse groove 61 gradually increases.

[0045] Specifically, such a setting can ensure the rigidity of the tread blocks while enhancing the grip of the tire.

[0046] Specifically, the tread of the tire of the present invention has four longitudinal grooves 20. The four longitudinal grooves 20 divide the tread into shoulder tread blocks 7, secondary tread blocks 8, and intermediate tread blocks 9. The ratio of the area occupied by the pattern grooves of the present invention to the entire tread area is [22%, 24%], so that the overall rigidity of the tire is relatively large, which can effectively reduce the rolling resistance while increasing the driving performance and stability performance of the tire. The first long transverse groove 61 divides the intermediate tread block 9, and the second long transverse groove 62 and the third long transverse groove 63 divide the secondary tread blocks 8, enhancing the grip of the tire under poor road conditions and enhancing the wet performance of the tire.

[0047] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0048] The tire of the present utility model has a tread center groove 10 extending along its circumferential direction, which divides the tread of the tire into two tread portions. Preset patterns are provided on each tread portion. The preset patterns include: a plurality of longitudinal grooves 20, and the longitudinal grooves 20 include a plurality of first straight grooves and a plurality of second straight grooves. The plurality of first straight grooves and the plurality of second straight grooves are arranged alternately. The preset angle between the groove walls of each first straight groove and the groove walls of the adjacent second straight groove is an obtuse angle. The tire with the above longitudinal grooves 20 can generate stronger grip than the straight pattern groove when the vehicle is driving straight and the stability is ensured; each tread portion includes a plurality of tread sub-portions arranged in sequence along the circumferential direction of the tire. The length of each tread sub-portion along the circumferential direction of the tire is a preset pitch. The preset pitches of any three adjacent tread sub-portions are different, and the three different preset pitches are arranged irregularly along the circumferential direction of the tire, which can reduce the peak value of the tire noise and improve the driving experience when the tire is running. Therefore, the tire of the present utility model can have good grip performance and low driving noise, thus solving the problem that the special tire for trailer wheels in the prior art is difficult to have good grip performance and low noise.

[0049] The tire of the present utility model has good grip performance, stone discharging performance, low noise and low fuel consumption.

[0050] For the sake of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" and the like can be used here to describe the spatial position relationship between one device or feature and other devices or features as shown in the figure. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "over other devices or structures" will be positioned as "below other devices or structures" or "under other devices or structures" afterwards. Thus, the exemplary term "above..." can include both orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used here will be made.

[0051] In addition, it should be noted that using words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meanings, so they cannot be understood as limiting the protection scope of the present application.

[0052] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A tire, characterized in that, The tire has a tread center groove (10) extending in its circumferential direction to divide the tread of the tire into two tread portions, and a preset pattern is provided on each of the tread portions. The preset pattern includes: A plurality of longitudinal grooves (20), the plurality of longitudinal grooves (20) are arranged at intervals in the axial direction of the tire. The longitudinal grooves (20) include a plurality of first straight grooves and a plurality of second straight grooves, and the plurality of first straight grooves and the plurality of second straight grooves are arranged alternately. A preset included angle between the groove walls of each first straight groove and the groove walls of the adjacent second straight groove is an obtuse angle; Each of the tread portions includes a plurality of tread sub-portions arranged in sequence in the circumferential direction of the tire. The length of each tread sub-portion in the circumferential direction of the tire is a preset pitch, and the preset pitches of any three adjacent tread sub-portions are different.

2. The tire according to claim 1, characterized in that, The tire has a predetermined plane parallel to its central axis. The projection intersection point of the central axis of the tire and the center line of the tread center groove (10) on the predetermined plane is the rotational symmetry center, and the preset pattern on each of the tread portions is centrosymmetrically arranged with respect to the rotational symmetry center.

3. The tire according to claim 1, wherein The preset pitch of each of the tread sub-portions is any one of three different pitch lengths. The three pitch lengths are the first pitch length, the second pitch length, and the third pitch length respectively; among the plurality of tread sub-portions, at least one of the tread sub-portions has a pitch length of the first pitch length, at least one of the tread sub-portions has a pitch length of the second pitch length, and at least one of the tread sub-portions has a pitch length of the third pitch length; wherein, the first pitch length, the second pitch length, and the third pitch length decrease successively.

4. The tire according to claim 1, wherein The value range of the preset included angle is 144° to 148°; The value range of the groove width of each of the longitudinal grooves (20) is 14 mm to 17 mm.

5. The tire according to claim 1, characterized in that In the width direction of each of the longitudinal grooves (20), each longitudinal groove (20) has a first groove wall (21) and a second groove wall (22) which are oppositely arranged. The first groove wall (21) extends along a first preset broken line segment. The second groove wall (22) extends along a second preset broken line segment. The first groove wall (21) is arranged away from the tread center groove (10) relative to the second groove wall (22). The first preset broken line segment includes a plurality of first straight line segments (23) and second straight line segments (24) connected in sequence. The plurality of first straight line segments (23) and the plurality of second straight line segments (24) are arranged alternately. The included angle between the second groove wall (22) and the mid-perpendicular plane of the bottom of the longitudinal groove (20) is a first preset angle θ1. The second preset broken line segment includes a plurality of third straight line segments (27) and fourth straight line segments (28) connected in sequence. The plurality of third straight line segments (27) and the plurality of fourth straight line segments (28) are arranged alternately. The included angle between the first groove wall (21) and the mid-perpendicular plane of the bottom of the longitudinal groove (20) is a second preset angle θ2. The first preset angle θ1 is less than the second preset angle θ2. The value range of the difference angle β1 between the first preset angle θ1 and the second preset angle θ2 is 2° ≤ β1 ≤ 4°.

6. The tire according to claim 5, characterized in that, There are two longitudinal grooves (20). The longitudinal groove (20) close to the tread center groove (10) among the two longitudinal grooves (20) is the first longitudinal groove (25), and the longitudinal groove (20) away from the tread center groove (10) is the second longitudinal groove (26). The second preset angle θ2 of the second longitudinal groove (26) is greater than the second preset angle θ2 of the first longitudinal groove (25). The value range of the difference angle β2 between the second preset angle θ2 of the second longitudinal groove (26) and the second preset angle θ2 of the first longitudinal groove (25) is 2° ≤ β2 ≤ 4°. The first preset angle θ1 of the second longitudinal groove (26) is greater than the first preset angle θ1 of the first longitudinal groove (25). The value range of the difference angle β3 between the first preset angle θ1 of the second longitudinal groove (26) and the first preset angle θ1 of the first longitudinal groove (25) is 2° ≤ β3 ≤ 4°.

7. The tire according to claim 1, characterized in that, There are also through grooves (30) provided on the tire. There are a plurality of through grooves (30), and the plurality of through grooves (30) are arranged at intervals in the circumferential direction of the tire on the tire shoulders.

8. The tire according to claim 6, characterized in that, The preset tread pattern further includes short transverse grooves (40). The short transverse grooves (40) communicate with the first groove wall (21) of the second longitudinal groove (26). The short transverse grooves (40) are provided at the intersection point of the first straight line segment (23) and the second straight line segment (24) away from the tire shoulder. There are a plurality of short transverse grooves (40), and the plurality of short transverse grooves (40) are arranged at intervals in the circumferential direction of the tire.

9. The tire according to claim 6, characterized in that, The preset pattern further includes narrow longitudinal grooves (50), the narrow longitudinal grooves (50) are arranged between the first longitudinal groove (25) and the second longitudinal groove (26), the narrow longitudinal grooves (50) include a plurality of third straight grooves and fourth straight grooves arranged in sequence, each of the third straight grooves and each of the fourth straight grooves are alternately arranged, and the included angle between the groove wall of each third straight groove and the groove wall of the adjacent fourth straight groove is an obtuse angle.

10. The tire according to claim 9, characterized in that, The preset pattern further includes a first long transverse groove (61), a second long transverse groove (62) and a third long transverse groove (63). The first end of the first long transverse groove (61) is connected and communicated with the tread center groove (10), and the second end of the first long transverse groove (61) is connected and communicated with the second groove wall (22) of the first longitudinal groove (25). Along the direction from the first end to the second end of the first long transverse groove (61), the groove width of the first long transverse groove (61) gradually increases; the first end of the second long transverse groove (62) is connected and communicated with the first groove wall (21) of the first longitudinal groove (25), and the second end of the second long transverse groove (62) is connected and communicated with one groove wall of the narrow longitudinal groove (50). Along the direction from the first end to the second end of the second long transverse groove (62), the groove width of the first long transverse groove (61) gradually decreases; the first end of the third long transverse groove (63) is connected and communicated with the other groove wall of the narrow longitudinal groove (50), and the second end of the third long transverse groove (63) is connected and communicated with the second groove wall (22) of the second longitudinal groove (26). Along the direction from the first end to the second end of the third long transverse groove (63), the groove width of the first long transverse groove (61) gradually increases.

Images