CN222372607U - Tire with a tire body - Google Patents

Abstract

The utility model provides a tire, wherein a tread of the tire is divided into two tread parts by a tread center groove, preset patterns are arranged on each tread part, each preset pattern comprises a first longitudinal groove, a plurality of grooves sequentially arranged at intervals along the circumferential direction of the tire, the first ends of the grooves extend to the tire shoulder, the second ends of the grooves extend towards the tread center groove and are connected and communicated with the first longitudinal groove, a plurality of connecting grooves sequentially arranged at intervals along the circumferential direction of the tire, each connecting groove is arranged between the first longitudinal groove and the tread center groove, the first ends of the connecting grooves are connected and communicated with the tread center groove, and the second ends of the connecting grooves are connected and communicated with the first longitudinal groove. The utility model solves the problem that the mining dump truck tire in the prior art is difficult to have good operability and good heat resistance.

Description

Tire with a tire body

Technical Field

The utility model relates to the field of tires, in particular to a tire.

Background

The weather conditions and road conditions of different mines in all regions are different, the mining dump truck tire needs to be suitable for local mine environments, for example, southeast Asia belongs to tropical rainforest climates, the mining road is a field non-paved road surface, the road condition is complex and various, the road surface is muddy and wet, uneven gravels are more, the tire is easy to slip, thermal delamination, cutting delamination and excessively rapid abrasion are caused, and the ideal service life is not achieved.

However, the current market lacks comprehensive products with good operability, good heat resistance and good wear resistance and cutting resistance, so that the exploitation efficiency of some mines cannot be improved, and the cost of users is increased.

Disclosure of utility model

The utility model mainly aims to provide a tire for solving the problem that the mining dump truck tire in the prior art is difficult to have good operability and good heat resistance.

In order to achieve the above purpose, the utility model provides a tire, wherein a tread center groove extends along the circumferential direction of the tire to divide the tread of the tire into two tread parts, each tread part is provided with a preset pattern, the preset pattern comprises a first longitudinal groove extending along the circumferential direction of the tire, the first longitudinal groove and the tread center groove are arranged at intervals along the width direction of the tire, a plurality of grooves sequentially arranged at intervals along the circumferential direction of the tire, first ends of the grooves extend to tire shoulders of the tire, second ends of the grooves extend towards the tread center groove and are connected and communicated with the first longitudinal groove, and a plurality of connecting grooves sequentially arranged at intervals along the circumferential direction of the tire, each connecting groove is arranged between the first longitudinal groove and the tread center groove, the first ends of the connecting grooves are connected and communicated with the tread center groove, and the second ends of the connecting grooves are connected and communicated with the first longitudinal groove.

Further, the tire has a predetermined plane parallel to the central axis thereof, the projection of the central line of the tread central groove on the predetermined plane is a symmetry line, and the projections of the preset patterns on the two tread portions on the predetermined plane are symmetrically arranged with respect to the symmetry line.

Further, the groove width of each groove gradually decreases from the first end of each groove to the second end of each groove, wherein the minimum groove width of each groove ranges from 50mm to 55mm, and the maximum groove width of each groove ranges from 70mm to 75mm.

Further, along the width direction of each groove, each groove is provided with a first groove wall and a second groove wall which are oppositely arranged, the first groove wall extends along a first preset straight line section, the second groove wall extends along a second preset straight line section, the first preset straight line section gradually extends towards the direction close to the second groove wall, and the second preset straight line section gradually extends towards the direction close to the first groove wall from the first end of each groove to the second end of each groove.

Further, from the first end of each groove to the second end of each groove, the first preset straight line segment comprises a first straight line segment and a second straight line segment which are sequentially arranged, the second preset straight line segment comprises a third straight line segment and a fourth straight line segment which are sequentially arranged, an included angle between the first straight line segment and the width direction of the tire is 3 degrees, an included angle between the second straight line segment and the width direction of the tire is 10 degrees, an included angle between the third straight line segment and the width direction of the tire is 3 degrees, and an included angle between the fourth straight line segment and the width direction of the tire is 6 degrees.

Further, the groove depth of each groove ranges from 75mm to 85mm, the groove depths of the grooves of each tread portion are equal, the groove bottoms of the cross sections of the grooves perpendicular to the extending direction of the grooves are part of arc segments of a first preset circle, the grooves are provided with a first groove side wall and a second groove side wall which are oppositely arranged along the width direction of the grooves, and an included angle between the first groove side wall and the second groove side wall is 20-30 degrees.

Further, the groove depth of each first longitudinal groove ranges from 55mm to 65mm, the groove depths of the first longitudinal grooves of the two tread portions are equal, the groove bottoms of the cross sections of the first longitudinal grooves perpendicular to the extending direction of the first longitudinal grooves are part of arc line segments of a second preset circle, the first longitudinal grooves are respectively provided with a third groove side wall and a fourth groove side wall which are oppositely arranged along the width direction of each first longitudinal groove, and the included angle between the third groove side wall and the fourth groove side wall is 4-8 degrees.

Further, the groove depth of the tread center groove ranges from 30mm to 40mm, the groove bottom of the cross section of the tread center groove perpendicular to the extending direction of the tread center groove is a part of an arc line segment of a third preset circle, the tread center groove is provided with a fifth groove side wall and a sixth groove side wall which are oppositely arranged along the width direction of the tread center groove, and an included angle between the fifth groove side wall and the sixth groove side wall is 4 degrees to 6 degrees.

Further, the groove width of each connecting groove is kept unchanged from the first end of each connecting groove to the second end of each connecting groove, the value range of the groove width of each connecting groove is 3-5 mm, the value range of the groove depth of each connecting groove is 40-50 mm, the groove bottom of the cross section of each connecting groove perpendicular to the extending direction of the connecting groove is a part of an arc line section of a fourth preset circle, and each connecting groove is provided with a seventh groove side wall and an eighth groove side wall which are oppositely arranged along the width direction of each connecting groove, wherein the seventh groove side wall and the eighth groove side wall are parallel to the normal extension surface of the groove bottom of the connecting groove.

Further, the preset patterns on each tread part further comprise a plurality of transverse grooves which are sequentially arranged at intervals along the circumferential direction of the tire, the first ends of the transverse grooves extend to the tire shoulder of the tire, the second ends of the transverse grooves extend towards the tread center groove and are connected with and communicated with the first longitudinal grooves, and the transverse grooves and the grooves are alternately arranged along the circumferential direction of the tire.

By arranging a plurality of connecting grooves on each tread part to communicate the tread center groove with the first longitudinal grooves, the two connecting grooves (one connecting groove on each tread part) and the tread center groove form a cross shape, the air flow is effectively improved, the heat generated by the tread in the middle of the tire is rapidly taken away along with the flowing air, the better heat dissipation effect is realized, the probability of thermal delamination of the tire is reduced, namely the effects of improving the heat dissipation of the tire, reducing the heat generation of the tire and increasing the operability of the tire are achieved, and the tire is a mining dump truck tire, so that the problem that the mining dump truck tire in the prior art is difficult to have good operability and good heat resistance at the same time is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a schematic view of an embodiment of a preset pattern of a tyre according to the utility model;

FIG. 2 shows a partial cross-sectional view of the cross-section at A-A in FIG. 1;

FIG. 3 shows a partial cross-sectional view of the cross-section at B-B in FIG. 1;

FIG. 4 shows a partial cross-sectional view of the cross-section at C-C in FIG. 1;

Fig. 5 shows a partial cross-sectional view of the section D-D in fig. 1.

Wherein the above figures include the following reference numerals:

10. Tread center groove, 20, first longitudinal groove, 30, groove, 40, connecting groove, 31, first groove wall, 32, second groove wall, 33, first straight line segment, 34, second straight line segment, 35, third straight line segment, 36, fourth straight line segment, 38, first groove sidewall, 39, second groove sidewall, 21, third groove sidewall, 22, fourth groove sidewall, 13, fifth groove sidewall, 14, sixth groove sidewall, 41, seventh groove sidewall, 42, eighth groove sidewall, 60, transverse groove, 311, wear indicator, 61, fifth straight line segment, 62, first arc segment, 63, sixth straight line segment, 64, second arc segment, 65, seventh straight line segment, 1, first tread sub-portion, 2, second tread sub-portion.

Detailed Description

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of the present application, and the azimuth terms "inside and outside" refer to inside and outside with respect to the outline of each component itself.

Referring to fig. 1 to 5, the present utility model provides a tire, in which a tread center groove 10 extends in a circumferential direction of the tire to divide the tread of the tire into two tread portions, each tread portion is provided with a preset pattern including a first longitudinal groove 20 extending in the circumferential direction of the tire, the first longitudinal groove 20 being spaced apart from the tread center groove 10 in a width direction of the tire, a plurality of grooves 30 sequentially spaced apart in the circumferential direction of the tire, a first end of each groove 30 extending to a shoulder of the tire, a second end of each groove 30 extending toward the tread center groove 10 and being connected to and penetrating through the first longitudinal groove 20, and a plurality of connecting grooves 40 sequentially spaced apart in the circumferential direction of the tire, each connecting groove 40 being disposed between the first longitudinal groove 20 and the tread center groove 10, a first end of each connecting groove 40 being connected to and penetrating through the tread center groove 10, and a second end of each connecting groove 40 being connected to and penetrating through the first longitudinal groove 20.

The utility model improves the rigidity and traction performance of the tire by arranging a plurality of grooves 30 on each tread part, enhances the operability of the tire by arranging one first longitudinal groove 20 on each tread part, enhances the operability of the tire by arranging a plurality of connecting grooves 40 on each tread part to communicate the tread central groove 10 and the first longitudinal groove 20, so that the two connecting grooves 40 (one connecting groove 40 on each tread part) and the tread central groove 10 form a cross shape, effectively improves the air flow, ensures that the heat generated by the tread in the middle part of the tire is quickly taken away along with the flowing air, further realizes better heat dissipation effect, reduces the probability of thermal delamination of the tire, namely plays the roles of improving the heat dissipation of the tire, reducing the heat generation of the tire and enhancing the operability of the tire.

Specifically, as shown in fig. 1, the first longitudinal groove 20 on each tread portion divides each tread portion into a first tread sub-portion 1 and a second tread sub-portion 2, the second tread sub-portion 2 is provided between the first longitudinal groove 20 and the tread center groove 10, and a region where the second tread sub-portions 2 on both tread portions are combined is defined as a central wear generating region (i.e., a region surrounded by a boundary line on a side of the first longitudinal groove 20 on each tread portion near the tread center groove 10 is defined as a boundary line, and a region surrounded by the boundary lines on both tread portions is defined as a central wear generating region), that is, a region in a broken line frame in fig. 1.

The tire of the present application has a small footprint due to centrifugal force and is mainly concentrated in the central wear heat generating zone, so that the sea Liu Bi of the central wear heat generating zone has a great influence on the wear-resistant heat dissipation performance of the tire, particularly on a rough road surface, and under heavy load, the sea Liu Bi of the central wear heat generating zone has a great influence on the wear-resistant heat dissipation traction performance of the tire, and the sea Liu Bi of the central wear heat generating zone is too large and can cause the deterioration of the heat dissipation traction performance, and the sea Liu Bi of the central wear heat generating zone is too small and can cause the deterioration of the wear-resistant puncture resistance performance, so that in the tire of the present application, the ratio of the total area of the tread center groove 10, all the first longitudinal grooves 20 and the tread area of the pattern blocks formed by all the connecting grooves 40 in the central wear heat generating zone to the tread area of the central wear generating zone is 70% to 75% under the condition that the whole sea Liu Bi of the tire is unchanged, so that the central wear heat generated zone of the tire of the present application has the optimal heat dissipation and puncture resistance performance is achieved on the basis of satisfying the traction performance and puncture resistance performance. Wherein, the transverse section of the pattern block is parallel to the tread portion, the sea Liu Bi of the central wear generating region refers to the percentage of the total area of all pattern blocks of the central wear generating region to the tread area of the central wear generating region, and the whole sea Liu Bi of the tire refers to the percentage of the total area of all pattern blocks of the tire to the whole tread area.

As shown in fig. 1, L3 is the lateral width of each tread portion, the lateral width L1 of the first tread portion 1 accounts for 58% -62% of the lateral width L3, and the lateral width L2 of the second tread portion 2 accounts for 38% -42% of the lateral width L3, which is the optimal ratio for improving the rigidity and the handling of the tire, and further improving the wear resistance, the cutting resistance and the running safety of the tire.

In the present embodiment, as shown in fig. 1, the tire has a predetermined plane parallel to the center axis thereof, the projection of the center line of the tread center groove 10 on the predetermined plane is a symmetry line, and the projections of the preset patterns on the two tread portions on the predetermined plane are symmetrically arranged with respect to the symmetry line.

Specifically, the lateral widths of the two tread portions are equal, and the lateral width direction of each tread portion is parallel to the extending direction of the center axis of the tire.

Specifically, the preset patterns on the two tread portions are symmetrically arranged relative to the symmetry line, which is helpful for reducing the rolling resistance of the tire.

In this embodiment, as shown in fig. 1, the groove width of each groove 30 gradually decreases from the first end of each groove 30 to the second end of each groove 30, wherein the minimum groove width of each groove 30 ranges from 50mm to 55mm, and the maximum groove width of each groove 30 ranges from 70mm to 75mm.

Specifically, by optimizing the groove width of each groove 30, it is ensured that each groove 30 can improve the rigidity and traction performance of the tire, enhancing the handling property of the tire.

In this embodiment, along the width direction of each groove 30, each groove 30 has a first groove wall 31 and a second groove wall 32 which are oppositely disposed, the first groove wall 31 is disposed along a first preset straight line segment, the second groove wall 32 is disposed along a second preset straight line segment, and from the first end of each groove 30 to the second end of each groove 30, the first preset straight line segment gradually extends toward a direction approaching the second groove wall 32, and the second preset straight line segment gradually extends toward a direction approaching the first groove wall 31.

Specifically, by optimizing the extending directions of the first groove wall 31 and the second groove wall 32, it is ensured that each groove 30 can improve the rigidity and traction performance of the tire, enhancing the handling property of the tire.

In the present embodiment, as shown in fig. 1, the first preset straight line segment includes a first straight line segment 33 and a second straight line segment 34 which are sequentially arranged from the first end of each groove 30 to the second end of each groove 30, the second preset straight line segment includes a third straight line segment 35 and a fourth straight line segment 36 which are sequentially arranged, the angle between the first straight line segment 33 and the width direction of the tire is 3 °, the angle between the second straight line segment 34 and the width direction of the tire is 10 °, the angle between the third straight line segment 35 and the width direction of the tire is 3 °, and the angle between the fourth straight line segment 36 and the width direction of the tire is 6 °.

Specifically, the width direction of the tire is the horizontal direction shown in fig. 1, and by optimizing the angles between the first preset straight line segment and the second preset straight line segment and the horizontal direction, the rigidity and traction performance of the tire can be improved and the operability of the tire can be enhanced by ensuring each groove 30.

Specifically, as shown in fig. 1, two wear marks 311 are further disposed in each groove 30, the two wear marks 311 are disposed at one end of each groove 30 near the tread center groove 10, and the distribution direction of the two wear marks 311 is perpendicular to the extending direction of each groove 30.

In this embodiment, as shown in fig. 2, the groove depth of each groove 30 is in the range of 75mm to 85mm, the groove depths of the grooves 30 of each tread portion are all equal, the groove bottom of the cross section of each groove 30 perpendicular to the extending direction thereof is a part of an arc segment of a first preset circle, each groove 30 has a first groove side wall 38 and a second groove side wall 39 oppositely arranged along the width direction of each groove 30, and the angle between the first groove side wall 38 and the second groove side wall 39 is 20 ° to 30 °.

Specifically, by optimizing the groove depth of each groove 30, it is ensured that each groove 30 can improve the rigidity and traction performance of the tire, enhancing the steering performance of the tire.

In this embodiment, as shown in fig. 3, the groove depth of each first longitudinal groove 20 is in the range of 55mm to 65mm, the groove depths of the first longitudinal grooves 20 of the two tread portions are equal, the groove bottoms of the cross sections of each first longitudinal groove 20 perpendicular to the extending direction thereof are part of arc segments of a second preset circle, each first longitudinal groove 20 has a third groove side wall 21 and a fourth groove side wall 22 oppositely arranged along the width direction of each first longitudinal groove 20, and the included angle between the third groove side wall 21 and the fourth groove side wall 22 is 4 ° to 8 °.

Specifically, each of the first longitudinal grooves 20 is zigzag. By optimizing the first longitudinal groove 20, it is ensured that the first longitudinal groove 20 can enhance the steering performance of the tire.

In this embodiment, as shown in fig. 4, the groove depth of the tread center groove 10 has a value ranging from 30mm to 40mm, the groove bottom of the cross section of the tread center groove 10 perpendicular to the extending direction thereof is a part of an arc segment of a third preset circle, the tread center groove 10 has fifth groove side walls 13 and sixth groove side walls 14 oppositely arranged in the width direction of the tread center groove 10, and an angle between the fifth groove side walls 13 and the sixth groove side walls 14 is 4 ° to 6 °.

Specifically, by optimizing the tread center groove 10, it is ensured that the tread center groove 10 can enhance the handling of the tire, while ensuring that the tread center groove 10 contributes to the air flow of the middle tread, enhancing the heat radiation of the tire.

In this embodiment, as shown in fig. 5, the groove width of each connecting groove 40 is kept constant from the first end of each connecting groove 40 to the second end of each connecting groove 40, the groove width of each connecting groove 40 is in the range of 3mm to 5mm, the groove depth of each connecting groove 40 is in the range of 40mm to 50mm, the groove bottom of each connecting groove 40 perpendicular to the extending direction is a part of an arc segment of a fourth preset circle, each connecting groove 40 has a seventh groove side wall 41 and an eighth groove side wall 42 which are oppositely arranged along the width direction of each connecting groove 40, and each seventh groove side wall 41 and eighth groove side wall 42 are parallel to the normal extending surface of the groove bottom of the connecting groove 40.

Specifically, by optimizing the connecting grooves 40, the heat in the middle of the tread can be dispersed to the left and right sides through the connecting grooves 40, so that the air flow of the tread in the middle can be fully promoted by the connecting grooves 40, and the heat dissipation of the tire can be enhanced.

Specifically, as shown in fig. 1, each of the connection grooves 40 gradually extends downward from the second end of each of the connection grooves 40 to the first end of each of the connection grooves 40.

In this embodiment, as shown in fig. 1, the preset patterns on each tread portion further include a plurality of transverse grooves 60 sequentially arranged at intervals along the circumferential direction of the tire, the first ends of the transverse grooves 60 extend to the shoulder of the tire, and the second ends of the transverse grooves 60 extend toward the tread center groove 10 and are connected to and penetrate through the first longitudinal grooves 20, wherein the transverse grooves 60 and the grooves 30 are alternately arranged along the circumferential direction of the tire.

Specifically, as shown in fig. 1, each lateral groove 60 gradually extends downward from the first end of each lateral groove 60 to the second end of each lateral groove 60. Each transverse groove 60 extends along a fourth preset line segment, the fourth preset line segment comprises a fifth straight line segment 61, a first arc segment 62, a sixth straight line segment 63, a second arc segment 64 and a seventh straight line segment 65 which are sequentially arranged, the included angles of the fifth straight line segment 61 and the seventh straight line segment 65 and the horizontal direction are 6 degrees, and the included angle of the sixth straight line segment 63 and the horizontal direction is 62 degrees.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

The utility model improves the rigidity and traction performance of the tire by arranging a plurality of grooves 30 on each tread part, enhances the operability of the tire by arranging one first longitudinal groove 20 on each tread part, enhances the operability of the tire by arranging a plurality of connecting grooves 40 on each tread part to communicate the tread central groove 10 and the first longitudinal groove 20, so that the two connecting grooves 40 (one connecting groove 40 on each tread part) and the tread central groove 10 form a cross shape, effectively improves the air flow, ensures that the heat generated by the tread in the middle part of the tire is quickly taken away along with the flowing air, further realizes better heat dissipation effect, reduces the probability of thermal delamination of the tire, namely plays the roles of improving the heat dissipation of the tire, reducing the heat generation of the tire and enhancing the operability of the tire.

Spatially relative terms, such as "above," "upper" and "upper surface," "above" and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the process is carried out, the exemplary term "above" may be included. Upper and lower. Two orientations below. The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A tire characterized in that a tread center groove (10) extends in a circumferential direction of the tire to divide a tread of the tire into two tread portions, each of the tread portions being provided with a preset pattern comprising:

A first longitudinal groove (20), the first longitudinal groove (20) extending in a circumferential direction of the tire, the first longitudinal groove (20) being disposed at an interval from the tread center groove (10) in a width direction of the tire;

A plurality of grooves (30) which are sequentially arranged at intervals along the circumferential direction of the tire, wherein the first end of each groove (30) extends to the tire shoulder of the tire, and the second end of each groove (30) extends towards the tread center groove (10) and is connected with and communicated with the first longitudinal groove (20);

The tire comprises a plurality of connecting grooves (40) which are sequentially arranged at intervals along the circumferential direction of the tire, wherein each connecting groove (40) is arranged between the first longitudinal groove (20) and the tread central groove (10), the first end of each connecting groove (40) is connected with and communicated with the tread central groove (10), and the second end of each connecting groove (40) is connected with and communicated with the first longitudinal groove (20).

2. Tyre according to claim 1, characterized in that it has a predetermined plane parallel to its central axis, the projection of the central line of the tread central groove (10) on said predetermined plane being a line of symmetry, the projections of the preset patterns on both tread portions on said predetermined plane being symmetrically arranged with respect to said line of symmetry.

3. Tyre according to claim 1, wherein the groove width of each groove (30) is gradually decreasing from the first end of each groove (30) to the second end of each groove (30), wherein the minimum groove width of each groove (30) has a value ranging from 50mm to 55mm and the maximum groove width of each groove (30) has a value ranging from 70mm to 75mm.

4. Tyre according to claim 1, wherein, in the width direction of each groove (30), each groove (30) has a first groove wall (31) and a second groove wall (32) arranged opposite each other, the first groove wall (31) being arranged to extend along a first preset straight line segment, the second groove wall (32) being arranged to extend along a second preset straight line segment, the first preset straight line segment gradually extending in a direction approaching the second groove wall (32) from a first end of each groove (30) to a second end of each groove (30), the second preset straight line segment gradually extending in a direction approaching the first groove wall (31).

5. Tyre according to claim 4, characterized in that the direction from the first end of each groove (30) to the second end of each groove (30) the first preset straight line segment comprises a first straight line segment (33) and a second straight line segment (34) arranged in sequence, the second preset straight line segment comprises a third straight line segment (35) and a fourth straight line segment (36) arranged in sequence, the angle between the first straight line segment (33) and the width direction of the tyre is 3 °, the angle between the second straight line segment (34) and the width direction of the tyre is 10 °, the angle between the third straight line segment (35) and the width direction of the tyre is 3 °, and the angle between the fourth straight line segment (36) and the width direction of the tyre is 6 °.

6. Tyre according to claim 1, wherein the groove depth of each groove (30) has a value ranging from 75mm to 85mm, the groove depths of the grooves (30) of each tread portion being equal, the groove bottoms of the cross sections of each groove (30) perpendicular to the direction of extension thereof being part of an arc segment of a first preset circle, each groove (30) having, along the width direction of each groove (30), a first groove side wall (38) and a second groove side wall (39) arranged opposite each other, the angle between the first groove side wall (38) and the second groove side wall (39) being 20 ° to 30 °.

7. Tyre according to claim 1, wherein the groove depth of each first longitudinal groove (20) is within the range of 55mm to 65mm, the groove depths of the first longitudinal grooves (20) of the two tread portions are equal, the groove bottoms of the cross sections of each first longitudinal groove (20) perpendicular to the extending direction thereof are part of arc segments of a second preset circle, each first longitudinal groove (20) is provided with a third groove side wall (21) and a fourth groove side wall (22) which are oppositely arranged along the width direction of each first longitudinal groove (20), and the included angle between the third groove side wall (21) and the fourth groove side wall (22) is 4 ° to 8 °.

8. Tyre according to claim 1, wherein the tread center groove (10) has a groove depth ranging from 30mm to 40mm, wherein the groove bottom of the cross section of the tread center groove (10) perpendicular to the extending direction thereof is a part of an arc segment of a third preset circle, wherein the tread center groove (10) has fifth groove side walls (13) and sixth groove side walls (14) arranged opposite to each other in the width direction of the tread center groove (10), and wherein the angle between the fifth groove side walls (13) and the sixth groove side walls (14) is from 4 ° to 6 °.

9. Tyre according to claim 1, wherein the groove width of each connecting groove (40) is kept constant from the first end of each connecting groove (40) to the second end of each connecting groove (40), the groove width of each connecting groove (40) ranges from 3mm to 5mm, the groove depth of each connecting groove (40) ranges from 40mm to 50mm, the groove bottom of the cross section of each connecting groove (40) perpendicular to the extending direction thereof is a part of an arc segment of a fourth preset circle, each connecting groove (40) has a seventh groove side wall (41) and an eighth groove side wall (42) which are oppositely arranged along the width direction of each connecting groove (40), and each seventh groove side wall (41) and each eighth groove side wall (42) are parallel to the normal extending surface of the groove bottom of the connecting groove (40).

10. Tyre according to claim 1, wherein said predetermined pattern on each tread portion further comprises a plurality of transverse grooves (60) arranged at intervals in succession along the circumferential direction of said tyre, a first end of each of said transverse grooves (60) extending up to the shoulder of said tyre, a second end of each of said transverse grooves (60) extending towards said tread central groove (10) and being connected to and communicating with said first longitudinal groove (20), wherein each of said transverse grooves (60) and each of said grooves (30) are arranged alternately along the circumferential direction of said tyre.