Radial tire

Abstract

The utility model provides a radial tire which comprises a tire body framework and a steel wire ring, the tire body framework is formed by wrapping the steel wire ring with tire body cord fabric, and the tire body cord fabric comprises a second turn-up cord fabric layer and a first turn-up cord fabric layer; along the length direction of the carcass ply, the plurality of second cords are arranged at intervals so as to be woven into a second turn-up ply, the plurality of first cords are arranged at intervals so as to be woven into a first turn-up ply, and the second turn-up ply covers the first turn-up ply and is positioned on one side, far away from the central axis of the tire, of the first turn-up ply; wherein an extension direction of the second cord may intersect an extension direction of the first cord. The radial tire solves the problem that the radial tire in the prior art cannot meet the requirements of high load and low air pressure at the same time.

Description

Technical Field

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

[0002] Heavy agricultural equipment is causing increasingly severe soil damage. The ruts left by its wheels cause the originally loose soil to clump and harden, which is detrimental to crop growth. This places new demands on the agricultural radial tires fitted to heavy agricultural equipment, requiring the use of low-pressure, high-load-capacity agricultural radial tires to ensure high load-bearing capacity while reducing the degree of soil damage caused by lower tire pressure.

[0003] However, reducing tire pressure or increasing tire load will increase the amount of deformation in the tire sidewall area. When the tire carcass material has low strength, it is very easy to cause radial cracks in the sidewall, thereby reducing tire life. Utility Model Content

[0004] The main objective of this invention is to provide a radial tire to solve the problem that existing radial tires cannot simultaneously meet the requirements of high load and low air pressure.

[0005] To achieve the above objectives, this utility model provides a radial tire, including a tire carcass and a steel wire ring. The tire carcass is formed by wrapping the steel wire ring with tire carcass ply fabric. The tire carcass ply fabric includes at least two mutually bonded reverse-wrap ply fabric layers. Along the length direction of the tire carcass ply fabric, the extension directions of the cords of any two reverse-wrap ply fabric layers may intersect.

[0006] Furthermore, the carcass ply includes a first reverse-wrapped ply layer and a second reverse-wrapped ply layer; along the length direction of the carcass ply, multiple second cords are spaced apart to weave together to form the second reverse-wrapped ply layer, and multiple first cords are spaced apart to weave together to form the first reverse-wrapped ply layer; the second reverse-wrapped ply layer covers the first reverse-wrapped ply layer and is located on the side of the first reverse-wrapped ply layer away from the central axis of the tire; wherein, the extension direction of the second cords may intersect with the extension direction of the first cords.

[0007] Furthermore, the angle between the extension direction of the second cord and the length direction of the tire carcass is β1, the angle between the extension direction of the first cord and the length direction of the tire carcass is β2, and the range of the difference angle θ1 between β1 and β2 is: 0°<θ1<30°.

[0008] Furthermore, along the width direction of the tire carcass ply, the width of the second reverse ply layer is smaller than the width of the first reverse ply layer. The first reverse ply layer has a first boundary line and a second boundary line arranged opposite to each other. The second reverse ply layer has a third boundary line and a fourth boundary line arranged opposite to each other. The third boundary line is positioned closer to the first boundary line relative to the fourth boundary line, and the fourth boundary line is positioned closer to the second boundary line relative to the third boundary line. The distance between the first boundary line and the third boundary line is h1, and the distance between the second boundary line and the fourth boundary line is h2. Wherein, the distances h1 and h2 are the same, and the value of h1 is in the range of 5mm ≤ h1 ≤ 30mm.

[0009] Furthermore, the projection line of the tire's horizontal axis onto the tire's preset projection surface is the reference line, the projection of each reverse-wrapping ply onto the tire's preset projection surface is the reverse-wrapping projection line, and the endpoint of each reverse-wrapping projection line away from the tire's central axis is the reverse-wrapping projection point. Along the extension direction of the tire's vertical axis, each reverse-wrapping projection point is located above the reference line.

[0010] Furthermore, the boundary line between the tire shoulder and the tire tread is the ninth boundary line, the projection point of the ninth boundary line on the preset projection surface of the tire is the first boundary point, the projection point of the tire center on the preset projection surface of the tire is the second boundary point, the line connecting the first boundary point and the second boundary point is the fifth boundary line, and at least one reverse projection point is located above the fifth boundary line along the extension direction of the tire's vertical axis.

[0011] Furthermore, the projection of the first reverse-wrapped ply layer onto the preset projection surface of the tire is the first projection line, and the projection of the second reverse-wrapped ply layer onto the preset projection surface of the tire is the second projection line. The endpoint of the first projection line away from the central axis of the tire is the first reverse-wrapped endpoint, and the endpoint of the second projection line away from the central axis of the tire is the second reverse-wrapped endpoint. Along the extension direction of the vertical axis of the tire, both the first reverse-wrapped endpoint and the second reverse-wrapped endpoint are located above the reference line.

[0012] Furthermore, both the first and second anti-wrapping endpoints are located below the fifth boundary line.

[0013] Furthermore, the carcass ply includes at least one positive wrap ply layer, which covers at least two negative wrap ply layers, with the positive wrap ply layer located on the side of the negative wrap ply layer away from the tire's central axis.

[0014] Furthermore, the tire carcass ply includes a first positive wrap ply layer, which covers the second negative wrap ply layer. The projection of the first positive wrap ply layer onto the preset projection surface of the tire is the first positive wrap line. Along the radial direction of the tire, the first negative wrap end point and the second negative wrap end point are both located between the first positive wrap line and the second boundary point.

[0015] The radial tire of this invention comprises a carcass and a steel wire ring. The carcass is formed by wrapping the steel wire ring with carcass ply fabric. The carcass ply fabric comprises at least two mutually bonded reverse-wrapped ply layers. The extension directions of the cords of any two reverse-wrapped ply layers can intersect, so that the at least two reverse-wrapped ply layers form a mesh structure, which enhances the impact resistance of the carcass ply fabric, effectively enhances the material strength of the tire carcass, and effectively avoids radial cracks on the tire sidewall caused by large deformation in the tire sidewall area under low air pressure and high load conditions. This allows the radial tire of this invention to simultaneously meet the requirements of high load and low air pressure, thereby solving the problem that radial tires in the prior art cannot simultaneously meet the requirements of high load and low air pressure. It also reduces the ground pressure of the radial tire of this invention and prevents heavy agricultural equipment equipped with the radial tire of this invention from damaging the soil. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the structure of the second reverse-wrap ply and the first reverse-wrap ply of a radial tire according to the present invention is shown.

[0018] Figure 2 A cross-sectional schematic diagram of the sidewall portion of a radial tire according to the present invention is shown.

[0019] Figure 3 It shows Figure 2 A magnified view of a portion of point A in the middle.

[0020] The above figures include the following reference numerals:

[0021] 10. Second reverse-wrapped fabric layer; 20. First reverse-wrapped fabric layer; 11. Second cord; 21. First cord; 1. First boundary line; 2. Second boundary line; 3. Third boundary line; 4. Fourth boundary line; 5. First reverse-wrapped end point; 6. Second reverse-wrapped end point; 30. First forward-wrapped fabric layer; 9. Fifth boundary line. Detailed Implementation

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] Please refer to Figures 1 to 3 This utility model provides a radial tire, including a tire carcass and a steel wire ring. The tire carcass is formed by wrapping the steel wire ring with tire carcass cord fabric. The tire carcass cord fabric includes at least two mutually attached reverse-wrap cord layers. Along the length direction of the tire carcass cord fabric, the extension directions of the cords of any two reverse-wrap cord layers can be intersected.

[0026] This utility model's radial tire includes a carcass and a steel wire ring. The carcass is formed by wrapping the steel wire ring with carcass ply fabric. The carcass ply fabric includes at least two mutually bonded reverse-wrapped ply layers. The extension directions of the cords in any two reverse-wrapped ply layers can intersect, so that the at least two reverse-wrapped ply layers form a mesh structure, enhancing the impact resistance of the carcass ply fabric and effectively increasing the material strength of the tire carcass. This effectively prevents radial cracks in the tire sidewall area caused by large deformation under low air pressure and high load conditions. This allows the radial tire of this utility model to simultaneously meet the requirements of high load and low air pressure, thus solving the problem that radial tires in the prior art cannot simultaneously meet the requirements of high load and low air pressure. It also reduces the ground pressure of the radial tire of this utility model and prevents heavy agricultural equipment equipped with the radial tire of this utility model from damaging the soil.

[0027] In this embodiment, the tire carcass ply includes a first reverse-wrapped ply layer 20 and a second reverse-wrapped ply layer 10. Along the length of the tire carcass ply, multiple second cords 11 are spaced apart to weave together to form the second reverse-wrapped ply layer 10, and multiple first cords 21 are spaced apart to weave together to form the first reverse-wrapped ply layer 20. The second reverse-wrapped ply layer 10 covers the first reverse-wrapped ply layer 20 and is located on the side of the first reverse-wrapped ply layer 20 away from the central axis of the tire. The extending directions of the second cords 11 and the first cords 21 may intersect.

[0028] Specifically, the radial tire of this invention includes a tire carcass and a steel wire bead. The tire carcass is formed by wrapping the steel wire bead with tire carcass ply fabric. The tire carcass ply fabric includes a second reverse-wrapped ply layer 10 and a first reverse-wrapped ply layer 20. The second reverse-wrapped ply layer 10 covers the first reverse-wrapped ply layer 20 and is located on the side of the first reverse-wrapped ply layer 20 away from the central axis of the tire. The second cord 11 is arranged such that its extension direction intersects with the extension direction of the first cord 21, so that the second reverse-wrapped ply layer 10 and the first reverse-wrapped ply layer 20 form a mesh. The structure enhances the impact resistance of the tire carcass ply and effectively strengthens the material strength of the tire skeleton. It effectively prevents radial cracks in the tire sidewall area caused by large deformation under low air pressure and high load conditions. This allows the radial tire of this invention to simultaneously meet the requirements of high load and low air pressure, thus solving the problem that radial tires in the prior art cannot simultaneously meet the requirements of high load and low air pressure. It also reduces the ground pressure of the radial tire of this invention and prevents heavy agricultural equipment equipped with the radial tire of this invention from crushing the soil.

[0029] In this embodiment, the angle between the extension direction of the second cord 11 and the length direction of the tire carcass is β1, the angle between the extension direction of the first cord 21 and the length direction of the tire carcass is β2, and the range of the difference angle θ1 between β1 and β2 is: 0° < θ1 < 30°.

[0030] Specifically, this design avoids excessively large θ1, which would cause cross-heating between the second cord 11 and the first cord 21 during tire deformation; at the same time, it avoids excessively small θ1, which would prevent the second reverse-wrapped ply layer 10 and the first reverse-wrapped ply layer 20 from fully forming a mesh structure, thus ensuring that the material strength of the tire skeleton can be effectively enhanced.

[0031] In this embodiment, along the width direction of the tire carcass ply, the width of the second reverse ply layer 10 is smaller than the width of the first reverse ply layer 20. The first reverse ply layer 20 has a first boundary line 1 and a second boundary line 2 arranged opposite to each other. The second reverse ply layer 10 has a third boundary line 3 and a fourth boundary line 4 arranged opposite to each other. The third boundary line 3 is positioned closer to the first boundary line 1 relative to the fourth boundary line 4, and the fourth boundary line 4 is positioned closer to the fifth boundary line 9 relative to the third boundary line 3. The distance between the first boundary line 1 and the third boundary line 3 is h1, and the distance between the second boundary line 2 and the fourth boundary line 4 is h2. The distances h1 and h2 are the same, and the value of h1 is in the range of 5mm ≤ h1 ≤ 30mm.

[0032] Specifically, this arrangement can effectively disperse the impact force on the second reverse-wrap ply 10 and the first reverse-wrap ply 20, enhance the impact resistance of the tire carcass ply, and help to enhance the material strength of the tire skeleton.

[0033] In this embodiment, the projection line of the horizontal axis of the tire onto the preset projection surface of the tire is the reference line, the projection of each reverse-wrapping ply onto the preset projection surface of the tire is the reverse-wrapping projection line, and the endpoint of each reverse-wrapping projection line away from the central axis of the tire is the reverse-wrapping projection point. Along the extension direction of the vertical axis of the tire, each reverse-wrapping projection point is located above the reference line.

[0034] Specifically, reducing tire pressure or increasing tire load will increase tire deformation and provide support by increasing the tire's contact patch, causing the tire sidewall to widen further. This large tire deformation will generate greater stress. By setting all reverse projection points to be located on the reference line (e.g., ... Figure 2 Above (as shown in B-B), each reverse projection point effectively avoids the large deformation area of ​​the tire (i.e., the area where the tire's horizontal axis is located), making the overall stress on the tire carcass more uniform, reducing the stress on each reverse projection point, and effectively preventing radial cracks in the tire sidewall area caused by large deformation under low air pressure and high load conditions.

[0035] Specifically, the preset projection surface of the tire is perpendicular to the circumferential side surface of the tire, the preset projection surface of the tire can bisect the circumferential side surface of the tire, and the preset projection surface extends along the horizontal axis of the tire.

[0036] In this embodiment, the boundary line between the tire shoulder and the tire tread is the ninth boundary line, the projection point of the ninth boundary line on the preset projection surface of the tire is the first boundary point, the projection point of the tire center on the preset projection surface of the tire is the second boundary point, the line connecting the first boundary point and the second boundary point is the fifth boundary line 9, and at least one reverse projection point is located above the fifth boundary line 9 along the extension direction of the tire's vertical axis.

[0037] Specifically, this setting further limits the distance between each reverse projection point and the reference line, further ensuring that each reverse projection point can effectively avoid the large deformation area of ​​the tire.

[0038] In this embodiment, the projection of the first reverse-wrapped ply 20 onto the preset projection surface of the tire is the first projection line, and the projection of the second reverse-wrapped ply 10 onto the preset projection surface of the tire is the second projection line. The endpoint of the first projection line away from the central axis of the tire is the first reverse-wrapped endpoint 5, and the endpoint of the second projection line away from the central axis of the tire is the second reverse-wrapped endpoint 6. Along the extension direction of the vertical axis of the tire, both the first reverse-wrapped endpoint 5 and the second reverse-wrapped endpoint 6 are located above the reference line.

[0039] Specifically, reducing tire pressure or increasing tire load will increase tire deformation and provide support by increasing the tire's contact patch, causing the tire sidewall to widen further. This large tire deformation will generate greater stress. By positioning the first and second reverse-wrapping endpoints 5 and 6 above the reference line, the first and second reverse-wrapping endpoints 5 and 6 effectively avoid the large tire deformation area (i.e., the area where the tire's horizontal axis is located), resulting in more uniform stress distribution on the tire carcass ply. This reduces the stress on the first and second reverse-wrapping endpoints 5 and 6, effectively preventing radial cracks in the tire sidewall area caused by large deformation under low pressure and high load conditions.

[0040] In this embodiment, both the first reverse end point 5 and the second reverse end point 6 are located below the fifth boundary line 9.

[0041] Specifically, this setting further limits the distance between the first reverse end point 5 and the second reverse end point 6 and the reference line, further ensuring that each reverse projection point can effectively avoid the large deformation area of ​​the tire.

[0042] In this embodiment, the tire carcass ply includes at least one positive ply layer, which covers at least two negative ply layers, and the positive ply layer is located on the side of the negative ply layer away from the tire's central axis.

[0043] Specifically, by having both positive and negative ply layers wrapping the tire's bead wire, the tire's bead support performance can be enhanced.

[0044] In this embodiment, the tire carcass ply includes a first positive wrap ply layer 30, which covers the second negative wrap ply layer 10. The projection of the first positive wrap ply layer 30 onto the preset projection surface of the tire is the first positive wrap line. Along the radial direction of the tire, the first negative wrap end point 5 and the second negative wrap end point 6 are both located between the first positive wrap line and the second boundary point.

[0045] Specifically, by setting the first reverse wrapping end point 5 and the second reverse wrapping end point 6 to be located between the first positive wrapping line and the second boundary point, the stress on the first reverse wrapping end point 5 and the second reverse wrapping end point 6 can be further reduced, effectively avoiding large deformation of the tire sidewall area under low air pressure and high load conditions, which could cause radial cracks in the tire sidewall.

[0046] Specifically, the horizontal axis of the tire coincides with the central axis of the tire.

[0047] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0048] This utility model's radial tire includes a carcass and a steel wire ring. The carcass is formed by wrapping the steel wire ring with carcass ply fabric. The carcass ply fabric includes at least two mutually bonded reverse-wrapped ply layers. The extension directions of the cords in any two reverse-wrapped ply layers can intersect, so that the at least two reverse-wrapped ply layers form a mesh structure, enhancing the impact resistance of the carcass ply fabric and effectively increasing the material strength of the tire carcass. This effectively prevents radial cracks in the tire sidewall area caused by large deformation under low air pressure and high load conditions. This allows the radial tire of this utility model to simultaneously meet the requirements of high load and low air pressure, thus solving the problem that radial tires in the prior art cannot simultaneously meet the requirements of high load and low air pressure. It also reduces the ground pressure of the radial tire of this utility model and prevents heavy agricultural equipment equipped with the radial tire of this utility model from damaging the soil.

[0049] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0050] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A radial tire, characterized in that, It includes a tire carcass and a steel wire ring, wherein the tire carcass is formed by wrapping the steel wire ring with tire carcass ply fabric, and the tire carcass ply fabric includes at least two mutually adhering reverse-wrapped ply fabric layers; Along the length of the tire carcass, the extension directions of the cords of any two of the reverse-wrapped ply layers can intersect.

2. The radial tire according to claim 1, characterized in that, The tire carcass fabric includes a first reverse-wrapped ply layer (20) and a second reverse-wrapped ply layer (10); Along the length of the tire carcass, multiple second cords (11) are spaced apart to weave together to form the second reverse-wrap ply (10), and multiple first cords (21) are spaced apart to weave together to form the first reverse-wrap ply (20). The second reverse-wrap ply (10) covers the first reverse-wrap ply (20) and is located on the side of the first reverse-wrap ply (20) away from the central axis of the tire. The extension directions of the second cords (11) and the first cords (21) may intersect.

3. The radial tire according to claim 2, characterized in that, The angle between the extension direction of the second cord (11) and the length direction of the tire cord is β1, and the angle between the extension direction of the first cord (21) and the length direction of the tire cord is β2. The value range of the difference angle θ1 between β1 and β2 is: 0° < θ1 < 30°.

4. The radial tire according to claim 2, characterized in that, Along the width direction of the tire carcass, the width of the second reverse-wrapped ply layer (10) is smaller than the width of the first reverse-wrapped ply layer (20). The first reverse-wrapped ply layer (20) has a first boundary line (1) and a second boundary line (2) arranged opposite to each other. The second reverse-wrapped ply layer (10) has a third boundary line (3) and a fourth boundary line (4) arranged opposite to each other. The third boundary line (3) is set closer to the first boundary line (1) relative to the fourth boundary line (4). The fourth boundary line (4) is set closer to the second boundary line (2) relative to the third boundary line (3). The distance between the first boundary line (1) and the third boundary line (3) is h1, and the distance between the second boundary line (2) and the fourth boundary line (4) is h2. The distances h1 and h2 are the same, and the value of h1 is in the range of 5mm≤h1≤30mm.

5. The radial tire according to claim 1, characterized in that, The projection line of the horizontal axis of the tire onto the preset projection surface of the tire is a reference line. The projection of each of the reverse-wrapping ply layers onto the preset projection surface of the tire is a reverse-wrapping projection line. The endpoints of each reverse-wrapping projection line away from the central axis of the tire are reverse-wrapping projection points. Along the extension direction of the vertical axis of the tire, each reverse-wrapping projection point is located above the reference line.

6. The radial tire according to claim 1, characterized in that, The boundary line between the tire shoulder and the tire tread is the ninth boundary line. The projection point of the ninth boundary line on the preset projection surface of the tire is the first boundary point. The projection point of the center of the tire on the preset projection surface of the tire is the second boundary point. The line connecting the first boundary point and the second boundary point is the fifth boundary line (9). Along the extension direction of the vertical axis of the tire, at least one reverse projection point is located above the fifth boundary line (9).

7. The radial tire according to claim 2, characterized in that, The projection of the first reverse-wrapped ply layer (20) onto the preset projection surface of the tire is a first projection line, and the projection of the second reverse-wrapped ply layer (10) onto the preset projection surface of the tire is a second projection line. The endpoint of the first projection line away from the central axis of the tire is the first reverse-wrapped endpoint (5), and the endpoint of the second projection line away from the central axis of the tire is the second reverse-wrapped endpoint (6). Along the extension direction of the vertical axis of the tire, both the first reverse-wrapped endpoint (5) and the second reverse-wrapped endpoint (6) are located above the reference line.

8. The radial tire according to claim 7, characterized in that, Both the first anti-wrapping endpoint (5) and the second anti-wrapping endpoint (6) are located below the fifth boundary line (9).

9. The radial tire according to claim 1, characterized in that, The tire carcass ply includes at least one positive-covering ply layer, which covers the at least two negative-covering ply layers, and the positive-covering ply layer is located on the side of the negative-covering ply layer away from the central axis of the tire.

10. The radial tire according to claim 7, characterized in that, The tire carcass ply includes a first positive wrap ply layer (30), which covers the second negative wrap ply layer (10). The projection of the first positive wrap ply layer (30) onto a preset projection surface of the tire is a first positive wrap line. Along the radial direction of the tire, the first negative wrap end point (5) and the second negative wrap end point (6) are both located between the first positive wrap line and the second boundary point.

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