High-durability shoulder-separation-resistant all-steel radial tire

Abstract

The invention provides a high-durability shoulder-separation-resistant all-steel radial tire, and belongs to the technical field of vehicle tires. Comprising a tire body, a lining layer, a tire sidewall, a tire crown, and first, second and third working belt plies which are sequentially arranged along the radial outer side of the tire body. Buffering cushion rubber is arranged between the tire body and the first working belted layer and is used for flexible buffering; and protection rubber strips are arranged in axial inner and outer end point areas of the first and second working belt plies, cover the end points of the first working belt ply and disperse stress. Optionally, a micro-channel is formed in the cushion rubber for heat dissipation, or an aramid short fiber reinforcing layer is arranged for puncture resistance. The problems that an existing tire is poor in durability, prone to shoulder vacancy and low in retreading rate are solved, the service life of the tire is effectively prolonged, and the comprehensive performance of the tire is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of automotive tire technology, and more particularly to a high-durability, anti-gap all-steel radial tire. Background Technology

[0002] All-steel radial tires are widely used in commercial vehicles, freight vehicles, and engineering vehicles due to their high load-bearing capacity and good driving stability. The belt layer structure of the tire crown is the core component that determines its load-bearing performance and durability. Current all-steel radial tires typically employ a four-layer belt layer structure in the crown, including one transition belt layer, two working belt layers, and one protective belt layer. The transition belt layer is designed to facilitate the transition of force transmission between the tire carcass and the working belt layers. The working belt layers bear the main load during driving, while the protective belt layer is used to resist external impacts and protect the working belt layers.

[0003] However, existing belt layer structures have significant technical defects. On the one hand, the transition belt layer adopts a rigid cord layer design, which can only achieve a "rigid transition" and cannot form a flexible buffer between the tire carcass and the working belt layer. The load transmitted by the tire carcass is directly applied to the working belt layer through the rigid transition belt layer, resulting in stress concentration at the interface between the two, which easily leads to the risk of delamination between the belt layer and the tire carcass. On the other hand, there is no targeted protection structure for the axial inner and outer ends of the working belt layer. During tire operation, the end areas are prone to cord cracking and rubber aging and shearing due to repeated bending and shear stress. In addition, the above-mentioned stress concentration problem will further lead to "shoulder voids" in the tire shoulder, that is, the shoulder rubber separates from the belt layer to form a void, which not only directly shortens the tire's service life, but also makes the tire unable to meet the requirements for retreading and reuse, significantly increasing the user's operating costs.

[0004] Therefore, there is an urgent need to provide a high-durability, anti-shoulder-hole all-steel radial tire. Summary of the Invention

[0005] This invention provides a high-durability, anti-shoulder-gaps all-steel radial tire to solve the technical problems of poor durability, easy shoulder gaps, and low retreading performance caused by the rigid design of the transition belt layer in existing all-steel radial tires, which leads to the lack of flexible buffer between the tire carcass and the working belt layer, stress concentration at the inner and outer ends of the belt layer in the axial direction.

[0006] This invention provides a high-durability, anti-shoulder-hole all-steel radial tire, comprising a tire carcass, an inner liner, a sidewall, a crown, and a first working belt layer, a second working belt layer, and a third working belt layer arranged sequentially along the radial outer side of the tire carcass; a buffer pad is provided between the tire carcass and the first working belt layer; a protective rubber strip is provided in the area between the axial inner and outer endpoints of the first and second working belt layers; the protective rubber strip covers the axial inner and outer endpoints of the first working belt layer.

[0007] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the all-steel radial tire has no transition belt layer for the transition between the tire carcass and the working belt layer.

[0008] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the buffer pad rubber is an integral buffer pad rubber with a thickness of 0.8 to 1.5 mm.

[0009] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the protective rubber strip has a thickness of 2-4 mm and a width of 20-40 mm.

[0010] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the outer edge of the protective rubber strip is disposed radially above the buffer pad rubber and is 10-20 mm away from the axial outer end point of the first working belt layer.

[0011] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the inner side of the protective rubber strip extends between the first working belt layer and the second working belt layer, and the distance between the protective rubber strip and the axial inner end point of the first working belt layer is 20-30 mm.

[0012] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the buffer pad rubber has microchannels spaced along the tire circumference.

[0013] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the width of the microchannel is 0.2-0.3 mm and the depth is 1-2 mm, and both ends of the microchannel extend to the tire sidewall.

[0014] The high-durability, anti-shoulder-hole all-steel radial tire provided by the present invention further includes an aramid short fiber reinforcement layer disposed on the radially outer side of the protective rubber strip near the tire crown.

[0015] According to the present invention, a high-durability, anti-shoulder-hole all-steel radial tire is provided, wherein the thickness of the aramid short fiber reinforcement layer is 0.5-0.8 mm.

[0016] The high-durability, anti-shoulder-hole all-steel radial tire provided by this invention has the following advantages compared with the prior art:

[0017] (1) The present invention provides a high-durability anti-shoulder-hole all-steel radial tire. Through the flexible buffering of the buffer pad rubber, the rigid impact between the tire body and the first working belt layer is avoided. At the same time, the stress is dispersed by protecting the end of the rubber strip covering. This can significantly reduce the cracking rate at the end of the belt layer and improve the durability of the all-steel radial tire.

[0018] (2) The present invention provides a high-durability anti-shoulder-gap all-steel radial tire, in which the protective rubber strip provides "wrap-like" protection for the inner and outer ends of the first working belt layer in the axial direction, effectively reducing the shoulder-gap problem caused by end delamination.

[0019] (3) The present invention provides a high-durability anti-shoulder-hole all-steel radial tire, which significantly reduces problems such as shoulder gap and end-point cracking, and the main structure of the tire carcass and belt layer is intact, and the retreading performance is significantly improved.

[0020] (4) The present invention provides a high-durability, anti-shoulder all-steel radial tire, wherein the microchannel design of the buffer pad rubber can efficiently dissipate heat and delay the aging of the rubber compound; the aramid short fiber reinforcement layer can improve the puncture resistance of the tire crown and is suitable for complex road conditions. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cross-sectional structure of the high-durability, anti-shoulder-hole all-steel radial tire provided in Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the high-durability, anti-shoulder-hole all-steel radial tire provided in Embodiment 3 of the present invention.

[0024] Figure label:

[0025] 1. Carcass; 2. First working belt layer; 3. Second working belt layer; 4. Third working belt layer; 5. Inner liner; 6. Sidewall; 7. Crown; 8. Cushion pad rubber; 9. Protective rubber strip; 10. Aramid short fiber reinforcement layer. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] The following is combined with Figures 1-2 This invention describes a high-durability, anti-shoulder all-steel radial tire.

[0028] Figure 1 This is a schematic diagram of the cross-sectional structure of the high-durability, anti-shoulder-hole all-steel radial tire provided in Embodiment 1 of the present invention.

[0029] like Figure 1 As shown, Embodiment 1 of the present invention provides a high-durability, anti-shoulder-hole all-steel radial tire, which eliminates the transition belt layer used for the transition between the tire carcass 1 and the working belt layer in the prior art. The flexible buffering function of the buffer pad rubber 8 replaces the rigid transition function of the transition belt layer, while simplifying the structure and reducing the weight.

[0030] In this invention, the high-durability anti-shoulder radial tire includes a tire body 1, an inner liner 5, a tire sidewall 6, a tire crown 7, and a first working belt layer 2, a second working belt layer 3, and a third working belt layer 4 arranged sequentially along the radial outer side of the tire body 1.

[0031] In this invention, a buffer pad 8 is provided between the tire body 1 and the first working belt layer 2 to replace the traditional rigid transition belt layer and realize flexible force transmission buffering between the tire body and the working belt layer.

[0032] In this invention, a protective strip 9 is provided in the area between the inner and outer axial endpoints of the first working belt layer 2 and the second working belt layer 3, and the protective strip 9 covers the inner and outer axial endpoints of the first working belt layer 2 to disperse the stress concentrated at the endpoints and prevent the endpoints from cracking or delaminating.

[0033] In this invention, the buffer pad 8 is an integral buffer pad with a thickness of 0.8–1.5 mm. Its integral structure avoids the interface gaps of traditional separate buffer pads, ensuring the continuity of the buffering effect. The thickness range of 0.8–1.5 mm can balance the buffering performance with the overall lightweight requirements of the tire. In light-load scenarios, the thickness of the buffer pad 8 is preferably 0.8–1.0 mm; in heavy-load scenarios, the thickness of the buffer pad 8 is preferably 1.2–1.5 mm.

[0034] In this invention, the protective rubber strip 9 has a thickness of 2-4 mm and a width of 20-40 mm. This size range ensures that the protective rubber strip 9 completely covers the axial inner and outer ends of the first working belt layer 2, while avoiding excessive occupation of the crown space and affecting the tire's contact performance. Specifically, in light-load medium-to-long-distance driving scenarios, the thickness of the protective rubber strip 9 is preferably 2-3 mm, and the width is preferably 20-30 mm; in heavy-load engineering scenarios, the thickness of the protective rubber strip 9 is preferably 3-4 mm, and the width is preferably 30-40 mm.

[0035] In this invention, the outer edge of the protective strip 9 is positioned radially above the buffer pad 8, and 10-20 mm away from the axial outer end point of the first working belt layer 2; the inner edge of the protective strip 9 extends between the first working belt layer 2 and the second working belt layer 3, and the distance between it and the axial inner end point of the first working belt layer 2 is 20-30 mm. This positioning design allows the protective strip 9 to form a "wrap-around" protection, completely covering the axial inner and outer ends of the first working belt layer 2 within the strip, maximizing the dispersion of end point stress.

[0036] In this invention, microchannels are spaced apart along the tire circumference inside the buffer pad rubber 8. The microchannels can form a heat dissipation path of "belt layer - buffer pad rubber - tire sidewall", which solves the problem of rubber aging caused by frictional heat generated by the belt layer during tire operation. The width of the microchannel is 0.2-0.3mm and the depth is 1-2mm. Both ends of the microchannel extend to the tire sidewall 6. This size design can achieve efficient heat dissipation without weakening the structural strength of the buffer pad rubber 8.

[0037] Figure 2 This is a schematic diagram of the cross-sectional structure of the high-durability, anti-shoulder-hole all-steel radial tire provided in Embodiment 3 of the present invention.

[0038] like Figure 2 As shown in Embodiment 3 of the present invention, a high-durability, anti-shoulder-hole all-steel radial tire further includes an aramid short fiber reinforcement layer 10. The aramid short fiber reinforcement layer 10 is disposed radially on the outer side of the protective rubber strip 9 near the tire crown 7, with a thickness of 0.5–0.8 mm. The aramid short fiber has high strength and puncture resistance, which can resist the impact of foreign objects such as stones and metal fragments on the protective rubber strip 9 and the endpoints of the underlying belt layer, preventing foreign objects from directly damaging the belt layer structure after puncturing the tire crown, thus further improving the tire's damage resistance.

[0039] Example 1

[0040] use Figure 1 The tire shown is suitable for light-load, medium-to-long-distance transportation scenarios. The buffer pad rubber is 0.9mm thick and does not have internal microchannels; the protective strip is 2.5mm thick and 25mm wide, with its outer edge 15mm from the axial outer end point of the first working belt layer and its inner edge 25mm from the axial inner end point of the first working belt layer.

[0041] Example 2

[0042] use Figure 1The tire shown is suitable for heavy-duty engineering scenarios. The thickness of the buffer pad rubber is 1.3mm, and there are no microchannels inside; the thickness of the protective rubber strip is 3.5mm, the width is 35mm, the outer edge is 10mm away from the outer axial end point of the first working belt layer, and the inner edge is 20mm away from the inner axial end point of the first working belt layer.

[0043] Example 3

[0044] use Figure 2 The tire shown is suitable for light-load, medium-to-long-distance transportation scenarios. The buffer pad has a thickness of 0.9mm, with microchannels spaced along the tire circumference. These microchannels are 0.25mm wide and 1.5mm deep, extending to the tire sidewalls at both ends. The protective strip has a thickness of 2.5mm and a width of 25mm. Its outer edge is 15mm from the axial outer endpoint of the first working belt layer, and its inner edge is 25mm from the axial inner endpoint of the first working belt layer. The aramid short fiber reinforcement layer has a thickness of 0.6mm.

[0045] Example 4

[0046] use Figure 2 The tire shown is suitable for heavy-duty engineering scenarios. The buffer pad has a thickness of 1.3mm, with microchannels spaced circumferentially around its interior. These microchannels are 0.3mm wide and 2mm deep, extending to the tire sidewalls at both ends. The protective strip has a thickness of 3.5mm and a width of 35mm, with its outer edge 10mm from the axial outer endpoint of the first working belt layer and its inner edge 20mm from the axial inner endpoint of the first working belt layer. The aramid short fiber reinforcement layer has a thickness of 0.7mm.

[0047] Comparative Example 1

[0048] It adopts the crown structure of a traditional all-steel radial tire, namely a belt layer structure consisting of four belt layers: a transition belt layer, two working belt layers, and a protective belt layer. The transition belt layer is located between the tire carcass and the first working belt layer to achieve a rigid transition. No cushioning pad, protective strip, or aramid short fiber reinforcement layer is included.

[0049] The performance of Examples 1-4 and Comparative Example 1 was statistically analyzed, and the results are shown in Table 1 below.

[0050] Table 1. Performance Data Sheet

[0051]

[0052] As shown in Table 1, all embodiments (1-4) adopted the core structure of "buffer pad adhesive" and "protective adhesive strip". Compared with the traditional structure of Comparative Example 1, they all showed overwhelming advantages in the four core indicators of end-point cracking rate, shoulder void occurrence rate, service life and refurbishment rate, proving the excellent effect of the basic solution of the present invention.

[0053] By comparing Examples 1 and 3, and Examples 2 and 4, it can be seen that under the same load conditions, adding an aramid layer significantly improves puncture resistance, further reduces end-point cracking rate and shoulder void rate, and correspondingly increases service life and refurbishment rate. This is because the aramid layer effectively resists external impacts, indirectly protecting the ends of the belt layer.

[0054] By comparing the heat dissipation performance of Examples 1 / 2 (without microchannels) and Examples 3 / 4 (with microchannels), it is clear that Examples 1 and 2 (without microchannels) have heat dissipation performance comparable to traditional tires. Examples 3 and 4 (with microchannels), however, achieve a significant cooling effect, which is crucial for delaying rubber aging and improving long-distance durability.

[0055] In addition, Examples 1 and 3 are for light-load scenarios, with smaller protective strip sizes; Examples 2 and 4 are for heavy-load scenarios, with larger protective strip and buffer pad sizes to ensure adequate protection under extreme loads, which is reflected in their superior durability data.

[0056] As can be seen, this invention, through the combination and optimized design of "buffer pad rubber", "protective rubber strip", "microchannel" and "aramid short fiber reinforcement layer", can significantly improve the overall performance of all-steel radial tires in different usage scenarios, and solve the technical problems of poor durability, easy shoulder gap and low retreading rate of traditional structures.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-durability, anti-shoulder-hole all-steel radial tire, characterized in that, It includes a carcass (1), an inner liner (5), a sidewall (6), a crown (7), and a first working belt layer (2), a second working belt layer (3), and a third working belt layer (4) arranged sequentially along the radial outer side of the carcass (1); A buffer pad (8) is provided between the tire body (1) and the first working belt layer (2); A protective rubber strip (9) is provided in the area between the inner and outer ends of the first working belt layer (2) and the second working belt layer (3); The protective strip (9) covers the inner and outer ends of the first working belt layer (2).

2. The all-steel radial tire according to claim 1, characterized in that, The all-steel radial tire has no transition belt layer for the transition between the tire carcass (1) and the working belt layer.

3. The all-steel radial tire according to claim 1, characterized in that, The buffer pad adhesive (8) is an integral buffer pad adhesive with a thickness of 0.8 to 1.5 mm.

4. The all-steel radial tire according to claim 1, characterized in that, The protective strip (9) has a thickness of 2-4 mm and a width of 20-40 mm.

5. The all-steel radial tire according to claim 1, characterized in that, The outer edge of the protective rubber strip (9) is located radially above the buffer pad rubber (8) and is 10-20 mm away from the outer end point of the first working belt layer (2).

6. The all-steel radial tire according to claim 1, characterized in that, The inner edge of the protective strip (9) extends between the first working belt layer (2) and the second working belt layer (3), and the distance between it and the axial inner end point of the first working belt layer (2) is 20-30 mm.

7. The all-steel radial tire according to claim 1, characterized in that, The buffer pad (8) has microchannels spaced along the tire circumference inside.

8. The all-steel radial tire according to claim 7, characterized in that, The microchannel has a width of 0.2-0.3 mm and a depth of 1-2 mm, and both ends of the microchannel extend to the tire sidewall (6).

9. The all-steel radial tire according to claim 1, characterized in that, It also includes an aramid short fiber reinforcement layer (10), which is disposed on the radial outer side of the protective rubber strip (9) near the tire crown (7).

10. The all-steel radial tire according to claim 9, characterized in that, The thickness of the aramid short fiber reinforcing layer (10) is 0.5 to 0.8 mm.

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