Tire shoulder structure

Abstract

The utility model belongs to tire structure technical field discloses a tire shoulder structure, including tire base body, belt layer structure, upper transition ply and lower transition ply, wherein, the both ends of belt layer structure form the shoulder structure with tire base body, the upper transition ply is laid above the end of belt layer structure, and the lower transition ply is laid below the end, along the direction perpendicular to the tread, the upper transition ply and the lower transition ply cover the end of all belt layers in belt layer structure. The cord elongation of transition ply is less than rubber, can make the rubber near the belt layer end point fixed to a certain extent, and then reduces the heat generation of peristalsis, and simultaneously can reduce the periodic deformation difference of rubber and belt layer, and then can effectively prevent the formation of shoulder empty, guarantees the service performance of tire.

Description

Technical Field

[0001] This utility model belongs to the field of tire structure technology, specifically relating to a tire shoulder structure. Background Technology

[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.

[0003] The belt layer is a rigid support layer beneath the tread, surrounding the tire. It is typically a mesh structure made of two or more layers of steel cords bonded together at opposite angles. The end faces of different belt layers may be misaligned, such as... Figure 1 As shown.

[0004] When a tire rolls, the shoulder area bears the most complex and intense periodic stress and strain. As the main pressure-bearing structure, the belt layer is located near its end point, which is the area where stress is most concentrated.

[0005] In a typical tire shoulder structure, the uncoated belt layer ends are in direct contact with a large area of ​​rubber. Clean steel wire surfaces are easily oxidized by oxygen in the air, forming a thin oxide layer. This oxide layer severely hinders the formation of strong chemical bonds between the rubber and the steel wire; uncoated steel wire lacks corrosion protection. Moisture and corrosive substances (such as road salt) can more easily penetrate the interface, causing the steel wire to rust. Rust, being larger than iron, expands and stretches the surrounding rubber, while the rust products themselves have no adhesive properties to the rubber, further damaging the interface.

[0006] Due to the significant difference in elastic modulus between steel wire and rubber, the strain at their interface is uncoordinated during periodic deformation, and this uncoordinated strain is even more pronounced at the endpoints of the belt layer. Moreover, the end face of the belt layer is a rigid end face, which continuously exerts a cutting force on the surrounding rubber under periodic stress and strain, causing the rubber to fail due to fatigue.

[0007] During cyclic deformation, rubber converts some mechanical energy into heat energy due to friction between its internal molecular chains. The tire shoulder is one of the areas of greatest deformation and also one of the hottest areas. High temperatures accelerate the thermo-oxidative aging process of rubber, making it hard, brittle, and inelastic. Furthermore, increased temperature significantly reduces the strength of the adhesive interface.

[0008] The combined factors mentioned above make it easy for the ends of the belt layer to separate from the rubber under stress, further forming a shoulder gap (tire shoulder delamination), which significantly reduces the strength of the tire and makes it prone to blowout when driving under load. Utility Model Content

[0009] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a tire shoulder structure.

[0010] To achieve the above objectives, this utility model is implemented through the following technical solution: This utility model provides a tire shoulder structure, including a tire body, a belt layer structure, an upper transition ply layer and a lower transition ply layer, wherein the two ends of the belt layer structure form a tire shoulder structure with the tire body. The upper transition fabric layer is laid above the end of the belt layer structure, and the lower transition fabric layer is laid below the end. Along the direction perpendicular to the tread, the upper transition ply and the lower transition ply cover the ends of all belt layers in the belt layer structure.

[0011] The beneficial effects achieved by one or more embodiments of the present invention are as follows: In this invention, the upper transition ply and the lower transition ply do not affect the arrangement of the main materials such as the belt layer, the pad rubber, and the tread rubber, and have little impact on the tire forming efficiency and the tire manufacturing cost.

[0012] Transitional cord fabrics have properties such as breaking elongation between steel wire and rubber. As a transitional material between steel cords and rubber with significant performance differences, they can effectively alleviate stress concentration.

[0013] The cord elongation of the transition fabric is less than that of the rubber, which can fix the rubber near the end of the belt layer to a certain extent, thereby reducing creep and heat generation. At the same time, it can reduce the difference in periodic deformation between the rubber and the belt layer, thus effectively preventing the formation of shoulder gaps and ensuring the performance of the tire. Attached Figure Description

[0014] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0015] Figure 1 This is a schematic diagram of the structure of a typical tire shoulder. Figure 2 This is a schematic diagram of the tire shoulder structure according to one embodiment of the present invention.

[0016] Among them, 1-1# belt layer; 2-2# belt layer; 3-3# belt layer; 4-4# belt layer; 5-pad rubber; 6-upper transition fabric layer; 7-lower transition fabric layer. Detailed Implementation

[0017] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0018] This utility model provides a tire shoulder structure, including a tire body, a belt layer structure, an upper transition ply layer and a lower transition ply layer, wherein the two ends of the belt layer structure form a tire shoulder structure with the tire body. The upper transition fabric layer is laid above the end of the belt layer structure, and the lower transition fabric layer is laid below the end. Along the direction perpendicular to the tread, the upper transition ply and the lower transition ply cover the ends of all belt layers in the belt layer structure.

[0019] The upper and lower transition ply layers are a solution to problems such as stress concentration, strain incompatibility, and heat generation at the interface between the belt layer endpoint and the rubber in ordinary tire shoulder structures. From a structural and functional perspective, the end of the belt layer structure is the area with the highest stress concentration. In ordinary structures, the elastic modulus of steel wire and rubber differs greatly, leading to strain incompatibility at the interface during periodic deformation. The continuous cutting of the rubber by the rigid end face can easily cause fatigue failure. At the same time, the heat generated by the internal molecular chain friction of the rubber during deformation accelerates thermo-oxidative aging and reduces the bonding interface strength.

[0020] The upper transition ply is laid above the ends of the belt layers, and the lower transition ply is laid below the ends, covering all the ends of the belt layers along a direction perpendicular to the tread. This arrangement creates a wrap-around transition for the belt layer ends from both top and bottom. The cord properties of the transition ply are between those of steel wire and rubber, effectively mitigating the performance differences between steel wire and rubber, coordinating interface strain, and avoiding stress concentration. Its cord elongation is less than that of rubber, which can provide some fixation for the rubber near the ends of the belt layers, reducing rubber creep to decrease heat generation, and simultaneously reducing the difference in periodic deformation between the rubber and the belt layers. This prevents the ends of the belt layers from separating from the rubber under stress, avoiding shoulder gaps and ensuring tire strength and performance. Furthermore, this arrangement does not affect the layout of the belt layers, gaskets, and other main materials, and has minimal impact on tire forming efficiency and manufacturing costs, solving technical problems while also considering practicality and economy.

[0021] In some embodiments, the upper transition fabric layer includes at least one transition fabric layer.

[0022] Preferably, the lower transition fabric layer includes at least one transition fabric layer.

[0023] Preferably, the transition fabric is a single-layer fiber fabric, a multi-layer fiber fabric, or a composite structure of multi-layer fiber fabric and film.

[0024] A further preferred embodiment is that the transition fabric is a composite structure of multi-layer fiber fabric and film.

[0025] The film can fill the gaps between the fiber cord layers and form a tighter physical and chemical bond with the surrounding rubber, improving the overall bonding strength between the transition cord and the belt layer and the shoulder rubber, and reducing the risk of interface separation.

[0026] Multi-layer fiber cords can coordinate the difference in elastic modulus between steel wires and rubber, and combined with the viscoelastic properties of the film, further alleviate stress concentration at the ends of the belt layer and reduce the cutting effect of the rigid end face on the rubber.

[0027] The addition of the film can block the rapid transfer of heat to the bonding interface and delay the thermo-oxidative aging of the rubber; at the same time, the multi-layer structure enhances the deformation resistance of the transition area through the synergistic effect of the fiber and the film, and reduces fatigue failure under cyclic stress.

[0028] Compared to single-material structures, composite structures can achieve a "balanced" transition effect by using fiber layers to provide tensile strength and film to provide flexibility, while controlling thickness and weight, thus avoiding negative impacts on the overall weight and rolling resistance of the tire.

[0029] Further preferably, the fibers in the transition fabric are made of nylon or polyester.

[0030] The elastic modulus and elongation of nylon and polyester fibers fall between those of steel wire and rubber in the belt layer, making them suitable as intermediate transition materials to coordinate interfacial strain differences and alleviate stress concentration. Their cord elongation is lower than that of rubber, which can provide some constraint on the rubber near the ends of the belt layer, reducing rubber creep during periodic deformation and thus lowering the risk of heat generation and fatigue failure.

[0031] Nylon and polyester have good resistance to heat and oxygen aging, and can adapt to the high temperature environment of the tire shoulder area, avoiding premature degradation of materials that would lead to failure of transitional functions; at the same time, their chemical stability can reduce interfacial reactions with rubber and steel wire, and maintain adhesive strength.

[0032] In addition, nylon and polyester are easy to process and have lower costs.

[0033] In some embodiments, the upper transition fabric layer and the lower transition fabric layer are disposed near the ends of the belt layer.

[0034] The end point of the belt layer is the location of the most intense stress and strain in the tire shoulder area. The transition cord needs to cover this area at close range in order to directly play the role of rigid-flexible transition. The composite structure of fiber cord and film coordinates the difference in elastic modulus between steel wire and rubber, and avoids the problem of stress concentration due to excessive distance not being effectively intervened.

[0035] One of the core functions of transition fabric is to fix the rubber near the end point by using the characteristic that the elongation rate of the cord is less than that of the rubber. Setting it at close range can directly act on the area where the rubber deformation is most severe, enhance the restraint effect, and avoid the inability to effectively control the rubber creep due to excessive distance, thereby reducing heat generation and periodic deformation differences.

[0036] Preferably, the distance between the endpoints of each belt layer of the upper transition fabric layer and the belt layer structure is less than 1 cm.

[0037] Preferably, the distance between the endpoints of each belt layer of the lower transition fabric layer and the belt layer structure is less than 1 cm.

[0038] The belt layer structure typically consists of multiple belt layers, and there may be slight misalignments at the endpoints of each belt layer. Setting a distance of less than 1 cm ensures that the transition cord completely covers the endpoints of all belt layers along the direction perpendicular to the tread, forming a "wrap-around" constraint and preventing local endpoints from becoming the starting point of detachment failure due to lack of coverage.

[0039] In some embodiments, the upper transition ply is laid in an arc shape with the convex surface facing the tread side.

[0040] During rolling, the tire tread undergoes cyclic compression and tensile deformation. The curved design allows the transition cord to adapt to the tread deformation, avoiding localized wrinkles or stress accumulation that may occur during flat laying, thus more evenly distributing concentrated stress at the belt layer endpoints. The convex surface facing the tread increases the contact area between the transition cord and the tread rubber, enhancing interfacial adhesion strength. Simultaneously, the curved surface guides the rubber deformation direction, reducing non-uniform creep near the belt layer endpoints and further lowering the risk of heat generation and fatigue failure. Furthermore, this structure matches the natural curvature of the tire shoulder, preventing the transition cord from adversely affecting the tread pattern or contact patch, ensuring the stability of the tire's overall rolling performance.

[0041] The present invention will now be described in detail with reference to the embodiments and accompanying drawings.

[0042] A tire shoulder structure, such as Figure 2 The tire shoulder structure includes a #1 belt layer 1, a #2 belt layer 2, a #3 belt layer 3, a #4 belt layer 4, a padding rubber layer 5, an upper transition cord layer 6, and a lower transition cord layer 7.

[0043] The upper transition fabric layer is laid above the end of the belt layer structure, and the lower transition fabric layer is laid below the end. Along the direction perpendicular to the tread, the upper transition ply and the lower transition ply cover the ends of all belt layers in the belt layer structure.

[0044] The upper transition fabric layer includes at least one transition fabric layer, and the lower transition fabric layer includes at least one transition fabric layer.

[0045] The transition curtain fabric is a single-layer fiber curtain fabric, a multi-layer fiber curtain fabric, or a composite structure of multi-layer fiber curtain fabric and film. Preferably, the transition curtain fabric is a composite structure of multi-layer fiber curtain fabric and film. The fibers in the transition curtain fabric are made of nylon or polyester.

[0046] The upper and lower transition fabric layers are positioned near the ends of the belt layer. The distance between the upper transition fabric layer and the endpoints of each belt layer in the belt layer structure is less than 1 cm, such as 0.3 cm, 0.5 cm, or 0.7 cm. The distance between the lower transition fabric layer and the endpoints of each belt layer in the belt layer structure is less than 1 cm, such as 0.3 cm, 0.5 cm, or 0.7 cm.

[0047] The upper transition cord layer is laid in an arc shape, with the convex side facing the tread side.

[0048] Transition cord fabric, acting as a transitional material between steel cords and rubber with significantly different properties, effectively alleviates stress concentration. The cord elongation of the transition cord fabric is less than that of the rubber, allowing for a degree of fixation of the rubber near the belt layer endpoints, thereby reducing creep and heat generation. This effectively prevents or delays the separation of the belt layer endpoints from the nearby rubber under periodically changing stress.

[0049] Forming steps: After the lower transition fabric is bonded with the adhesive pad, it is attached to the corresponding position on the belt layer. Other steps proceed normally. After the upper transition fabric is bonded to the belt layer, it is attached to the corresponding position at the end point of the belt layer. Other steps proceed normally.

[0050] 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 tire shoulder structure, characterized in that: It includes a tire base, a belt layer structure, an upper transition ply, and a lower transition ply, wherein the two ends of the belt layer structure form a shoulder structure with the tire base; The upper transition fabric layer is laid above the end of the belt layer structure, and the lower transition fabric layer is laid below the end. Along the direction perpendicular to the tread, the upper transition ply and the lower transition ply cover the ends of all belt layers in the belt layer structure.

2. The tire shoulder structure according to claim 1, characterized in that: The upper transition fabric layer includes at least one transition fabric layer.

3. The tire shoulder structure according to claim 1, characterized in that: The lower transition fabric layer includes at least one transition fabric layer.

4. The tire shoulder structure according to claim 3, characterized in that: The transition fabric can be a single-layer fiber fabric, a multi-layer fiber fabric, or a composite structure of multi-layer fiber fabric and film.

5. The tire shoulder structure according to claim 4, characterized in that: The transition fabric is a composite structure of multi-layer fiber fabric and film.

6. The tire shoulder structure according to claim 4, characterized in that: The fibers in the transition fabric are made of nylon or polyester.

7. The tire shoulder structure according to claim 1, characterized in that: The upper transition fabric layer and the lower transition fabric layer are positioned near the ends of the belt layer.

8. The tire shoulder structure according to claim 7, characterized in that: The distance between the endpoints of each belt layer in the upper transition fabric layer and the belt layer structure is less than 1 cm.

9. The tire shoulder structure according to claim 7, characterized in that: The distance between the endpoints of each belt layer in the lower transition fabric layer and the belt layer structure is less than 1 cm.

10. The tire shoulder structure according to claim 7, characterized in that: The upper transition ply is laid in an arc shape, with the convex side facing the tread side.

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