Tire and manufacturing mold thereof

Abstract

The utility model provides a tire and a manufacturing mould thereof, the tread of the tire comprises four longitudinal grooves, each longitudinal groove extends along the circumferential direction of the tire, and the four longitudinal grooves are arranged at intervals along the axial direction of the tire so as to divide the tread of the tire into a plurality of tread parts which are distributed at intervals along the axial direction of the tire; a plurality of first grooves are formed in any one of the tread portions, the first grooves spirally extend in the direction close to the central axis of the tire in the radial direction of the tire, and the normal center line direction of the groove bottoms of the first grooves is parallel to the radial direction of the tire. According to the utility model, the problem of poor maneuverability of the tire in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tires, in particular to a tire and a manufacturing mold thereof. Background Art

[0002] Interconnected bumps or grooves are designed on the three-dimensional first steel sheet. For tires produced using the three-dimensional first steel sheet mold, the three-dimensional grooving on the tread blocks can enhance the mutual locking between the tread blocks, inhibit tread block creep, and improve tread block rigidity.

[0003] However, the installation direction of the three-dimensional first steel plate is fixed, and the force direction of the tire is not fixed during use. In certain force directions, the interlocking effect between the pattern blocks is poor, which affects the rigidity of the tire and results in poor handling of the tire. In addition, the tire installed with the three-dimensional first steel plate is noisy. Utility Model Content

[0004] The main purpose of the utility model is to provide a tire and a manufacturing mold thereof, so as to solve the problem of poor maneuverability of tires in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a tire is provided, the tread of the tire includes: four longitudinal grooves, each longitudinal groove extends along the circumferential direction of the tire, and the four longitudinal grooves are arranged at intervals along the axial direction of the tire to separate the tread of the tire into a plurality of tread portions spaced apart along the axial direction of the tire; a plurality of first grooves are provided on any one of the plurality of tread portions, and along the radial direction of the tire, the first grooves extend spirally in a direction close to the central axis of the tire, and the normal centerline direction of the groove bottom of the first groove is arranged parallel to the radial direction of the tire.

[0006] Furthermore, multiple first grooves are arranged at intervals along the circumferential direction of the tire, and the extension directions of any two adjacent first grooves on the tread portion can be arranged to intersect, and the extension direction of each first groove on the tread portion is inclined at a preset angle relative to the circumferential direction of the tire.

[0007] Furthermore, along the circumferential direction of the tire, a plurality of circular pattern areas are arranged at intervals on the tread portion, and the plurality of circular pattern areas and the plurality of first grooves are arranged in one-to-one correspondence, and each first groove is arranged in a corresponding circular pattern area; wherein, the center of the circular pattern area is arranged to coincide with the intersection of the normal center line of the groove bottom of the first groove and the tread portion.

[0008] Furthermore, each circular pattern area is provided with a circular groove, the circular groove in each circular pattern area is connected to the corresponding first groove, and the center of the circular groove is arranged to coincide with the center of the circular pattern area.

[0009] Furthermore, along the radial direction of the tire, the groove depth of the circular groove is less than or equal to the groove depth of the first groove; along the circumferential direction of the tire, the diameter of the circular groove is greater than the groove width of the first groove.

[0010] According to another aspect of the present invention, a manufacturing mold is provided, which is suitable for manufacturing the above-mentioned tire. The manufacturing mold includes a cavity, which is used to accommodate the tire to be vulcanized. The manufacturing mold also includes a first steel sheet, which is spiral-shaped and arranged in the cavity. The first steel sheet is connected to the inner top wall of the cavity, and the axis of the first steel sheet extends along the radial direction of the tire. The first steel sheet is used to form a first groove.

[0011] Furthermore, the first steel sheet has a first end and a second end disposed opposite to each other in the radial direction of the tire, and the second end is rotated relative to the first end by a preset angle θ; wherein 0°≤θ≤360°.

[0012] Furthermore, along the radial direction of the tire, a plurality of through holes are spaced apart on the first steel sheet, and the flow cross-sectional area of ​​the through holes close to the top of the first steel sheet is greater than the flow cross-sectional area of ​​the through holes away from the top of the first steel sheet; wherein, the distance c between the upper end surface of the through hole closest to the top of the first steel sheet and the top of the first steel sheet is in the range of: 0.5mm≤c≤3mm.

[0013] Furthermore, the manufacturing mold also includes a connecting column and a bearing, the connecting column is used to form a circular groove, the first end of the connecting column is passed through the top of the first steel sheet and is connected to the inner ring of the bearing, and the connecting column is rotatably arranged around the axis of the connecting column to drive the first steel sheet to rotate; wherein, the axis of the connecting column and the axis of the first steel sheet are arranged to coincide with each other.

[0014] Furthermore, a mounting hole is opened above the cavity of the mold, and the bearing is installed in the mounting hole. The mounting hole and the bearing are interference fit, the axial lower end face of the bearing and the outer top wall of the cavity are arranged flush, and the first end of the connecting column passes through the top wall of the cavity to be connected to the inner ring of the bearing; wherein, along the axial direction of the connecting column, the distance g between the axial lower end face of the bearing and the top end face of the first steel sheet has a value range of 0.1mm≤g≤0.3mm.

[0015] According to the technical solution of the present invention, the tire tread includes four longitudinal grooves, which divide the tire tread into a plurality of tread portions spaced apart along the axial direction of the tire. A plurality of first grooves are provided on any one of the plurality of tread portions. The first grooves extend in a spiral shape in a direction close to the central axis of the tire in the radial direction of the tire, and the normal centerline of the groove bottom of the first groove is arranged parallel to the radial direction of the tire. Because the first grooves are spiral in shape, the angle between the groove wall of the first groove and the normal centerline of the groove bottom of the first groove varies along the radial direction of the tire. During use, regardless of the direction of external force applied to the tire, there will always be tread blocks in corresponding positions that can produce an interlocking effect, thereby improving the tire's handling performance and reducing tire wear, thereby resolving the problem of poor maneuverability of tires in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 A schematic structural diagram of an embodiment of a tire according to the present invention (the first groove is located in the third tread portion) is shown;

[0018] Figure 2 A schematic structural diagram of an embodiment of a tire according to the present invention (the first groove is located in the fourth tread portion) is shown;

[0019] Figure 3 Shows a schematic diagram of the assembly of the production mold and the first steel sheet according to the utility model;

[0020] Figure 4 Shows a schematic diagram of the structure of the mold according to the present invention;

[0021] Figure 5 A schematic top view of a part of the mold structure according to the present invention is shown;

[0022] Figure 6 A schematic side view of a part structure of a mold according to the present invention is shown;

[0023] Figure 7 A partial cross-sectional schematic diagram of a tire according to the present utility model is shown;

[0024] Figure 8 A schematic structural diagram of a first steel sheet for making a mold according to the present invention (the first steel sheet remains relatively stationary relative to the mold) is shown;

[0025] Figure 9 A schematic structural diagram of a first steel sheet for making a mold according to the present invention is shown;

[0026] Figure 10 A schematic front view of the structure of a first steel sheet for making a mold according to the present invention is shown;

[0027] Figure 11 A schematic top view of the structure of a first steel sheet for making a mold according to the present invention is shown;

[0028] Figure 12 A schematic side view of the structure of a first steel sheet for making a mold according to the present invention is shown;

[0029] Figure 13 Shows a schematic diagram of the assembly of the production mold and the second steel sheet according to the utility model;

[0030] Figure 14 Shows a schematic diagram of the assembly of the production mold and the third steel sheet according to the utility model;

[0031] Figure 15 A schematic diagram showing the position of the first groove of the tire according to the present utility model is shown;

[0032] Figure 16 A schematic diagram showing the second end portion of the first steel sheet of the mold manufacturing method according to the present invention rotates relative to the first end portion;

[0033] Figure 17 A schematic structural diagram of a first steel sheet of pattern t1 for making a mold according to the present invention is shown;

[0034] Figure 18 A schematic structural diagram of a first steel sheet of the T2 style for manufacturing a mold according to the present invention is shown;

[0035] Figure 19 A schematic structural diagram of a first steel sheet of the T3 style for making a mold according to the present invention is shown;

[0036] Figure 20 A schematic structural diagram of a first steel sheet of the T4 style for making a mold according to the present invention is shown;

[0037] Figure 21 A schematic structural diagram of a first steel sheet of the T5 style for making a mold according to the present invention is shown;

[0038] Figure 22 A schematic structural diagram of a first steel sheet of the T6 style for making a mold according to the present invention is shown;

[0039] Figure 23 Shown Figure 19Schematic cross-sectional view of the first steel sheet of T3 style.

[0040] The above drawings include the following reference numerals:

[0041] 10. Longitudinal groove; 11. First tread portion; 12. Second tread portion; 13. Third tread portion; 14. Fourth tread portion; 15. Fifth tread portion; 21. First groove; 20. Circular pattern area; 22. Circular groove; 24. Annular protrusion; 281. Second groove; 291. Third groove; 30. First steel sheet; 32. First end portion; 33. Second end portion; 34. Through hole; 35. Connecting column; 36. Bearing; 40. Mounting hole; 60. Manufacturing mold; 25. Circular depression; 26. Annular groove; 80. Second steel sheet; 81. Third steel sheet. DETAILED DESCRIPTION

[0042] It should be noted that the terms used herein are only for describing specific embodiments 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 form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement of the parts 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 ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0044] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0045] Please refer to Figures 1 to 23 The utility model provides a tire, the tread of the tire comprising: four longitudinal grooves 10, each longitudinal groove 10 extending along the circumferential direction of the tire, the four longitudinal grooves 10 being arranged at intervals along the axial direction of the tire to separate the tread of the tire into a plurality of tread portions spaced apart along the axial direction of the tire; a plurality of first grooves 21 being provided on any one of the plurality of tread portions, and extending spirally in a direction close to the central axis of the tire in the radial direction of the tire, and a normal centerline direction of a groove bottom of the first groove 21 being arranged parallel to the radial direction of the tire.

[0046] The tread of the tire of the present invention includes four longitudinal grooves 10, which divide the tire tread into a plurality of tread portions spaced apart along the axial direction of the tire. A plurality of first grooves 21 are provided on any one of the plurality of tread portions. The first grooves 21 extend in a spiral shape in a direction close to the central axis of the tire in the radial direction of the tire, and the normal centerline of the groove bottom of the first groove 21 is arranged parallel to the radial direction of the tire. Because the first grooves 21 are spiral in shape, the angle between the groove wall of the first groove 21 and the normal centerline of the groove bottom of the first groove 21 varies along the radial direction of the tire. During use of the tire, regardless of the direction of external force applied to the tire, there will always be tread blocks in corresponding positions that can produce an interlocking effect, thereby improving the tire's handling performance and reducing tire wear, thereby resolving the problem of poor maneuverability of tires in the prior art.

[0047] Specifically, when using a conventional first steel sheet, the angle of the sipes is fixed relative to the tire, which easily creates a regular impact when the tire contacts the ground, causing increased tire tread noise. Because the angle of the first groove 21 on the tire surface is random, and the angle between the groove wall of the first groove 21 and the normal centerline of the groove bottom of the first groove 21 varies, the angle of the first groove 21 when contacting the ground is even more disordered, preventing the formation of a regular excitation, thereby reducing tread noise. Therefore, the first groove 21 of the present application not only improves tire wear, handling, and other performance, but also reduces tire driving noise.

[0048] In specific implementation, if the tire pattern is symmetrical, the first groove 21 can be on any tread portion. If the tire pattern is asymmetrical, the first groove 21 should be set on the tread portion close to the shoulder. Because the width of the first groove 21 is narrower and the rotation angle is larger, it is beneficial to improve the rigidity of the tread portion. The rigidity requirements of the tread portion close to the shoulder are higher.

[0049] Specifically, a plurality of second grooves 281 are provided on any one of the plurality of tread portions. Along the radial direction of the tire, the second grooves 281 extend spirally in a direction close to the center axis of the tire. The normal center line direction of the groove bottom of the second groove 281 is arranged parallel to the radial direction of the tire. The plurality of second grooves 281 are arranged at intervals along the circumferential direction of the tire.

[0050] Specifically, a plurality of third grooves 291 are provided on any one of the plurality of tread portions. Along the radial direction of the tire, the third grooves 291 extend spirally in a direction close to the center axis of the tire. The normal center line direction of the groove bottom of the third groove 291 is arranged parallel to the radial direction of the tire, and the plurality of third grooves 291 are arranged at intervals along the circumferential direction of the tire.

[0051] Specifically, each tread portion may be provided with any one of the first groove 21 , the second groove 281 and the third groove 291 .

[0052] In a specific implementation, the four longitudinal grooves 10 are arranged at intervals along the axial direction of the tire to separate the tread of the tire into a first tread portion 11, a second tread portion 12, a third tread portion 13, a fourth tread portion 14 and a fifth tread portion 15 distributed in sequence along the axial direction of the tire. The third tread portion 13 is provided with a plurality of first grooves 21; Figure 1 As shown, a plurality of first grooves 21 are provided on the third tread portion 13 , a plurality of second grooves 281 are provided on the second tread portion 12 , and a plurality of third grooves 291 are provided on the fourth tread portion 14 .

[0053] In this embodiment, a plurality of first grooves 21 are arranged at intervals along the circumferential direction of the tire, and the extension directions of any two adjacent first grooves 21 on the tread portion can be arranged to intersect, and the extension direction of each first groove 21 on the tread portion is inclined at a preset angle relative to the circumferential direction of the tire.

[0054] Optionally, the preset angle ranges from 0° to 180°.

[0055] In this embodiment, a plurality of circular pattern areas 20 are arranged at intervals on the tread portion along the circumferential direction of the tire. The plurality of circular pattern areas 20 and the plurality of first grooves 21 are arranged in a one-to-one correspondence, and each first groove 21 is arranged in a corresponding circular pattern area 20; wherein, the center of the circular pattern area 20 is arranged to coincide with the intersection of the normal center line of the groove bottom of the first groove 21 and the tread portion.

[0056] In this embodiment, a circular groove 22 is provided in each circular pattern area 20 , and the circular groove 22 in each circular pattern area 20 is connected to the corresponding first groove 21 , and the center of the circular groove 22 is arranged to coincide with the center of the circular pattern area 20 .

[0057] In specific implementation, the minimum distance f between the circumferential edge of the circular pattern area 20 and the groove wall of the longitudinal groove closest to the circular pattern area 20 should be greater than 2 mm, and the minimum distance j between the circumferential edge of the circular pattern area 20 and the circumferential edge of another circular pattern area 20 closest to the circular pattern area 20 should be greater than 2 mm.

[0058] In this embodiment, along the radial direction of the tire, the groove depth of the circular groove 22 is less than or equal to the groove depth of the first groove 21 ; along the circumferential direction of the tire, the diameter of the circular groove 22 is greater than the groove width of the first groove 21 .

[0059] Specifically, the circular pattern area 20 is further provided with a plurality of annular protrusions 24 , which are spaced apart along the radial direction of the circular pattern area 20 , and the central axis of each annular protrusion 24 is arranged to coincide with the central axis of the circular pattern area 20 .

[0060] The present utility model also provides a manufacturing mold 60, which is suitable for manufacturing the above-mentioned tire. The manufacturing mold 60 includes a cavity, which is used to accommodate the tire to be vulcanized. The manufacturing mold 60 also includes a first steel sheet 30. The first steel sheet 30 is spiral-shaped and is arranged in the cavity. The first steel sheet 30 is connected to the inner top wall of the cavity. The axis of the first steel sheet 30 extends along the radial direction of the tire. The first steel sheet 30 is used to form a first groove 21.

[0061] Specifically, the thickness t of the first steel sheet 30 is between 0.2 mm and 2 mm; the minimum depth L of the first steel sheet 30 is 2 mm, and the maximum depth L of the first steel sheet 30 is (the groove depth of the longitudinal groove 10 - 1.6 mm).

[0062] In this embodiment, the first steel sheet 30 has a first end 32 and a second end 33 arranged opposite to each other in the radial direction of the tire, and the second end 33 rotates around the axis of the first steel sheet 30 by a preset angle θ relative to the first end 32; wherein 0°≤θ≤360°.

[0063] In a specific implementation, in order to avoid demoulding difficulties or affecting the life of the first steel sheet 30, the rotation angle of the first steel sheet 30 should not exceed 180° for every 8 mm increase in the axis direction of the first steel sheet 30.

[0064] Specifically, the manufacturing mold 60 further includes a second steel sheet 80 and a third steel sheet 81 . The second steel sheet 80 is used to manufacture the second groove 281 , and the third steel sheet 81 is used to manufacture the third groove 291 .

[0065] In this embodiment, the manufacturing mold 60 also includes a connecting column 35 and a bearing 36. The connecting column 35 is used to form a circular groove 22. The first end of the connecting column 35 is passed through the top of the first steel sheet 30 and is connected to the inner ring of the bearing 36. The connecting column 35 is rotatably arranged around the axis of the connecting column 35 to drive the first steel sheet 30 to rotate; wherein the axis of the connecting column 35 and the axis of the first steel sheet 30 are arranged to coincide with each other.

[0066] Specifically, the connection post 35 can rotate counterclockwise or clockwise, and the connection post 35 is used to form the circular groove 22 .

[0067] Specifically, the top of the first steel sheet 30 is the first end 32 of the first steel sheet 30. The minimum distance between the second end of the connecting post 35 and the first end 32 of the first steel sheet 30 in the direction of the axis of the first steel sheet 30 is 2 mm. The maximum distance h2 between the second end of the connecting post 35 and the first end 32 of the first steel sheet 30 in the direction of the axis of the first steel sheet 30 is equal to the distance between the second end 33 and the first end 32. The diameter d2 of the connecting post 35 is 1 mm to 2 mm and should be at least 0.4 mm larger than the thickness t of the first steel sheet 30.

[0068] Specifically, the connecting column 35 is used to connect the first steel sheet 30 and the production mold 60, and the bearing 36 is used to limit and support the connecting column 35. The first steel sheet 30 and the production mold 60 can be connected in other ways to ensure normal vulcanization mold opening and closing.

[0069] Specifically, the rotation of the first steel sheet 30 can reduce the force on the tire during the vulcanization mold opening and closing, thereby protecting both the manufacturing mold 60 and the tire.

[0070] In this embodiment, a mounting hole 40 is opened above the cavity of the manufacturing mold 60, and the bearing 36 is installed in the mounting hole 40. The mounting hole 40 and the bearing 36 are interference fit. The axial lower end face of the bearing 36 is arranged flush with the outer top wall of the cavity. The first end of the connecting column 35 passes through the top wall of the cavity to be connected to the inner ring of the bearing 36; wherein, along the axial direction of the connecting column 35, the distance g between the axial lower end face s of the bearing 36 and the top end face of the first steel sheet 30 has a value range of 0.1mm≤g≤0.3mm.

[0071] Specifically, if the distance g is too large, rubber may enter during vulcanization, forming a noticeable rubber edge and affecting the tire's appearance. If it is too small, the first steel sheet 30 may experience excessive friction with the mold 60 during rotation, affecting the mold release effect and the service life of the first steel sheet 30. The top end surface of the first steel sheet 30 refers to the axial end surface of the top of the first steel sheet 30 that is close to the bearing 36.

[0072] Specifically, the outer diameter d1 of the bearing 36 should be greater than 5 mm, and the thickness h1 of the bearing 36 should be greater than 5 mm, so that the first steel sheet 30 and the manufacturing mold 60 are firmly assembled without affecting the appearance of the tire.

[0073] Specifically, the diameter d3 of the mounting hole 40 should be 0mm to 0.02mm smaller than the outer diameter d1 of the bearing 36, so that the bearing 36 can form an interference fit with the manufacturing mold 60 after being installed in the mounting hole 40, thereby increasing the firmness. If the mounting hole 40 is too large, the assembly between the first steel sheet 30 and the manufacturing mold 60 will be too loose, which may easily cause the first steel sheet 30 to fall off; if the mounting hole 40 is too small, the bearing 36 will squeeze too much around the mounting hole 40 after the first steel sheet 30 is assembled, which will cause the manufacturing mold 60 to deform; the depth h3 of the mounting hole 40 is the same as the thickness h1 of the bearing 36, so that the axial lower end face of the bearing 36 and the outer top wall of the cavity are set flush.

[0074] Specifically, the mounting hole 40 should be designed to be closed and not connected to the exhaust hole. The air in the mounting hole 40 generates outward pressure during vulcanization, which can prevent the rubber from entering. If the mounting hole 40 is connected to the exhaust hole, the rubber may easily enter the mounting hole 40 during vulcanization, affecting the use of the mold.

[0075] In this embodiment, a circular depression 25 is provided on the outer top wall of the cavity. The diameter W2 of the circular depression 25 is 1 mm to 2 mm larger than the width W1 of the first steel sheet 30. The depth h4 of the circular depression 25 is approximately 0.05 mm to 0.2 mm. A plurality of annular grooves 26 are provided within the circular depression 25. The depth h5 of the annular grooves 26 is less than 0.2 mm. The circular depression 25 is used to form the circular pattern area 20, and the annular grooves 26 are used to form the annular protrusions 24.

[0076] Specifically, the provision of the circular depression 25 and the annular groove 26 can prevent the tire appearance from being significantly different after the mold 60 is used for a long time.

[0077] Specifically, since the first steel sheet 30 rotates during use, it can leave circular friction marks on the mold after long-term use, causing changes in the tire's appearance. The provision of the circular depression 25 and the plurality of annular grooves 26 will result in the presence of circular friction marks even when the mold is newly manufactured. This can be considered a special design feature and does not cause any difference between the new and old molds. If the depression is too shallow, the improvement effect is minimal; if it is too deep, a noticeable bump will form on the tire, affecting tire performance.

[0078] In this embodiment, a plurality of through holes 34 are spaced apart on the first steel sheet 30 along the radial direction of the tire, and the flow cross-sectional area of ​​the through holes 34 close to the top of the first steel sheet 30 is greater than the flow cross-sectional area of ​​the through holes 34 away from the top of the first steel sheet 30; wherein, the distance c between the upper end surface of the through hole 34 closest to the top of the first steel sheet 30 and the top of the first steel sheet 30 is in the range of 0.5 mm ≤ c ≤ 3 mm.

[0079] Specifically, this arrangement not only allows for intercommunication of gas on both sides of the first groove 21, preventing poor tire quality caused by poor exhaust during tire vulcanization, but also enhances the interlocking ability of the tread blocks, improving the tire's handling. The distance c between the top of the first steel sheet 30 and the upper end surface of the through-hole 34 closest to the top of the first steel sheet 30 refers to the distance between the upper end surface of the through-hole 34 closest to the top of the first steel sheet 30 and the axial end surface of the top of the first steel sheet 30 away from the bearing 36.

[0080] Specifically, the distance a between any two adjacent through holes 34 in the axial extension direction of the first steel sheet 30 should be greater than 2 mm to prevent the first steel sheet 30 from having insufficient strength due to an excessive density of the through holes 34 .

[0081] Specifically, the through-holes 34 can be in various shapes, such as circular, polygonal, or elongated. The second end 33 of the first steel sheet 30 first contacts the rubber during tire vulcanization. The surrounding air is easily squeezed into the space above it, which is relatively large. Air can then be discharged outside the mold through pores on the mold surface. There is little need for air communication between the two sides of the first steel sheet 30. This portion is effective in the later stages of tire use, when the upper portions of the tire tread blocks have been worn away, the tread blocks are relatively low, and the block stiffness is relatively high, making increased stiffness less necessary. The first end 32 of the first steel sheet 30 is the last to contact the rubber during vulcanization. A small enclosed space is easily formed at the first steel sheet. Without vents around it, quality issues such as rubber deficiency and rounded corners can easily result. A through-hole 34 with a larger cross-sectional area can improve air communication between the two sides of the first steel sheet 30. This portion is effective in the early stages of tire use, when the tire tread blocks are relatively high and stiff. Increasing the cross-sectional area of ​​the through-holes 34 can provide better interlocking between the tire blocks and increase block stiffness.

[0082] During specific implementation, the first steel sheet 30 can be processed into different styles, such as style t1, in which the first steel sheet is composed of multiple planes at different angles, and the number of planes is not less than 4 for every 180-degree rotation of the first steel sheet 30; such as style t2, the distance h2 between the second end of the connecting column 35 and the first end 32 of the first steel sheet 30 in the axial extension direction of the first steel sheet 30 should be equal to the distance between the second end 33 and the first end 32; it can also be other lengths. Different three-dimensional shapes can be processed on the first steel sheet 30 to increase the interlocking effect, such as style t3, in which a zigzag shape is added, the zigzag amplitude m should be less than 3 mm, and the zigzag period length n should be greater than 3 mm. Other shapes such as cones can also be added, and the distance k from the edge of the added three-dimensional shape to the first end 32 and the second end 33 of the first steel sheet should be greater than 0.5 mm.

[0083] During specific implementation, such as style t4, style t5 and style t6, the first steel sheet 30 can be processed into different lengths, widths and pitches. The width of the first steel sheet 30 can change with the depth (can be gradual or step-by-step). The width of the first end 32 of the first steel sheet 30 (tire surface side) is determined according to the tire pattern design requirements. The width of the second end 33 of the first steel sheet 30 should be less than or equal to the width of the first end 32 of the first steel sheet 30. The minimum width of the second end 33 of the first steel sheet 30 should not be less than 2 mm.

[0084] Optionally, the first steel sheet 30 can also remain relatively stationary relative to the manufacturing mold 60. In this case, the connecting column 35 and the bearing 36 are removed, and the first end 32 of the first steel sheet 30 is directly connected to the inner top wall of the cavity, and the second end 33 is rotated around the axis of the first steel sheet 30 at a preset angle θ relative to the first end 32; wherein 0°≤θ≤90°; along the extension direction of the axis of the first steel sheet 30, the maximum distance b between the projections of the first end 32 and the second end 33 of the first steel sheet 30 on the tread portion is 7 mm.

[0085] In specific implementation, when the width W1 of the first steel sheet 30 is greater than 13 mm, and the preset angle θ at which the second end portion 33 rotates around the axis of the first steel sheet 30 relative to the first end portion 32 is small, it is recommended that the first steel sheet 30 can also remain relatively stationary relative to the manufacturing mold 60; when the width W1 of the first steel sheet 30 is less than or equal to 13 mm, the first steel sheet 30 can also rotate relative to the manufacturing mold 60.

[0086] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0087] The tread of the tire of the present invention includes four longitudinal grooves 10, which divide the tire tread into a plurality of tread portions spaced apart along the axial direction of the tire. A plurality of first grooves 21 are provided on any one of the plurality of tread portions. The first grooves 21 extend in a spiral shape in a direction close to the central axis of the tire in the radial direction of the tire, and the normal centerline of the groove bottom of the first groove 21 is arranged parallel to the radial direction of the tire. Because the first grooves 21 are spiral in shape, the angle between the groove wall of the first groove 21 and the normal centerline of the groove bottom of the first groove 21 varies along the radial direction of the tire. During use of the tire, regardless of the direction of external force applied to the tire, there will always be tread blocks in corresponding positions that can produce an interlocking effect, thereby improving the tire's handling performance and reducing tire wear, thereby resolving the problem of poor maneuverability of tires in the prior art.

[0088] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0089] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tire, characterized in that: The tread of the tire comprises: Four longitudinal grooves (10), each of the longitudinal grooves (10) extending along the circumferential direction of the tire, and the four longitudinal grooves (10) being arranged at intervals along the axial direction of the tire to separate the tread of the tire into a plurality of tread portions spaced apart along the axial direction of the tire; A plurality of first grooves (21) are provided on any one of the plurality of tread portions. Along the radial direction of the tire, the first grooves (21) extend spirally in a direction close to the central axis of the tire, and the normal centerline direction of the groove bottom of the first groove (21) is arranged parallel to the radial direction of the tire.

2. The tire according to claim 1, wherein A plurality of first grooves (21) are arranged at intervals along the circumferential direction of the tire, and the extension directions of any two adjacent first grooves (21) on the tread portion can be arranged to intersect, and the extension direction of each first groove (21) on the tread portion is inclined at a preset angle relative to the circumferential direction of the tire.

3. The tire according to claim 1, wherein: Along the circumferential direction of the tire, a plurality of circular pattern areas (20) are arranged at intervals on the tread portion, the plurality of circular pattern areas (20) and the plurality of first grooves (21) are arranged in a one-to-one correspondence, and each first groove (21) is arranged in a corresponding circular pattern area (20); wherein the center of the circular pattern area (20) is arranged to coincide with the intersection of the normal center line of the groove bottom of the first groove (21) and the tread portion.

4. The tire according to claim 3, characterized in that A circular groove (22) is provided in each of the circular pattern areas (20), the circular groove (22) in each of the circular pattern areas (20) is arranged in communication with the corresponding first groove (21), and the center of the circular groove (22) is arranged to coincide with the center of the circular pattern area (20).

5. The tire according to claim 4, characterized in that Along the radial direction of the tire, the groove depth of the circular groove (22) is less than or equal to the groove depth of the first groove (21); along the circumferential direction of the tire, the diameter of the circular groove (22) is greater than the groove width of the first groove (21).

6. A production mold, characterized in that, Suitable for making the tire according to any one of claims 1 to 5, the making mold includes a cavity, the cavity is used to accommodate the tire to be vulcanized, the making mold also includes a first steel sheet (30), the first steel sheet (30) is spiral-shaped, the first steel sheet (30) is arranged in the cavity, the first steel sheet (30) is connected to the inner top wall of the cavity, the axis of the first steel sheet (30) extends along the radial direction of the tire, and the first steel sheet (30) is used to form the first groove (21).

7. The production mold according to claim 6, characterized in that: The first steel sheet (30) has a first end (32) and a second end (33) arranged opposite to each other in the radial direction of the tire, and the second end (33) rotates relative to the first end (32) by a preset angle θ; wherein 0°≤θ≤360°.

8. The production mold according to claim 6, characterized in that: Along the radial direction of the tire, a plurality of through holes (34) are spaced apart on the first steel sheet (30), and the flow cross-sectional area of ​​the through holes (34) close to the top of the first steel sheet (30) is greater than the flow cross-sectional area of ​​the through holes (34) away from the top of the first steel sheet (30); wherein, the distance c between the upper end surface of the through hole (34) closest to the top of the first steel sheet (30) and the top of the first steel sheet (30) is in the range of 0.5 mm ≤ c ≤ 3 mm.

9. The production mold according to claim 6, characterized in that: The manufacturing mold also includes a connecting column (35) and a bearing (36), wherein the connecting column (35) is used to form a circular groove (22), the first end of the connecting column (35) is passed through the top of the first steel sheet (30) and is connected to the inner ring of the bearing (36), and the connecting column (35) is rotatably arranged around the axis of the connecting column (35) to drive the first steel sheet (30) to rotate; wherein the axis of the connecting column (35) and the axis of the first steel sheet (30) are arranged to coincide with each other.

10. The production mold according to claim 9, characterized in that: A mounting hole (40) is provided above the cavity of the manufacturing mold, and the bearing (36) is installed in the mounting hole (40). The mounting hole (40) and the bearing (36) are interference fit. The axial lower end face of the bearing (36) is flush with the outer top wall of the cavity. The first end of the connecting column (35) is passed through the top wall of the cavity to be connected to the inner ring of the bearing (36); wherein, along the axial direction of the connecting column (35), the distance g between the axial lower end face of the bearing (36) and the top end face of the first steel sheet (30) has a value range of 0.1mm≤g≤0.3mm.

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