Tire capable of improving surface cracking of ring part

Abstract

The invention discloses a tire capable of improving surface cracking of a ring part, and relates to the technical field of tires, the tire comprises a tire body, a lower apex is arranged at the bottom of a turn-up groove of the tire body, an upper apex is arranged at one end, close to the end of the turn-up groove of the tire body, of the lower apex, and the upper apex extends out of the turn-up groove of the tire body. A steel wire reinforcing layer wraps a toe opening of the tire body, lining layer rubber is arranged on the inner sides of the tire body and the steel wire reinforcing layer, tire side type rubber is arranged on the outer sides of the upper apex, the tire body and the steel wire reinforcing layer, and wear-resistant rubber is arranged at the lower ends of the lining layer rubber and the steel wire reinforcing layer and on the side wall of the tire side type rubber. On the premise that the inner contour and the outer contour of an existing tire product are not changed, the overall rigidity of the tire bead is improved by adjusting the width of the tire body and the steel wire reinforcing layer, the size and the shape of the apex and the proportion of the wear-resistant rubber and the sidewall rubber, the surface cracking of the ring part is relieved and avoided, the temperature of the ring part is reduced, and the durability of the tire bead is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tires, and specifically to a tire for improving the cracking of the bead area surface. Background Art

[0002] The "sidewall" is the main flexing component of a tire and is closely related to the load-bearing capacity, comfort, rolling resistance performance, and durability performance of the tire. With the rapid development of new energy vehicles, compared with traditional fuel vehicles, due to characteristics such as the increased vehicle weight caused by the battery system, large torque, fast response during starting and steering in new energy vehicles, the sidewall will bear more severe stress / strain. The rubber molecules on the tire surface are subjected to the dual effects of thermal-oxidative aging and mechanical load. As the driving mileage increases, the surface of the bead area, being in the stress concentration area, is prone to cracking first, which not only affects the aesthetics of the tire but also poses certain safety hazards. In the tire design process, reasonable design means are required to slow down or avoid the cracking problem of the bead area surface.

[0003] In view of the above problems, an improved tire for improving the cracking of the bead area surface is now designed. Summary of the Invention

[0004] The purpose of the present invention is to provide a tire for improving the cracking of the bead area surface to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A tire for improving the cracking of the bead area surface includes a carcass. A lower triangular rubber is provided at the bottom of the turn-up groove of the carcass. A bead wire is provided inside the lower triangular rubber. An upper triangular rubber is provided at one end of the lower triangular rubber close to the end of the turn-up groove of the carcass. The upper triangular rubber is in close contact with the sidewall of the carcass and extends out of the turn-up groove of the carcass. A wire reinforcing layer is wrapped around the bead of the carcass. An inner liner rubber is provided on the inner sides of the carcass and the wire reinforcing layer. A sidewall rubber is provided on the outer sides of the upper triangular rubber, the carcass, and the wire reinforcing layer. A wear-resistant rubber is provided at the lower ends of the inner liner rubber and the wire reinforcing layer and on the sidewall of the sidewall rubber. A sidewall rubber is provided on the sidewalls of the wear-resistant rubber, the sidewall rubber, the upper triangular rubber, and the carcass.

[0007] As a further solution of the present invention: The wire reinforcing layer should satisfy:

[0008] H2 = 0.3 * H1 to 0.8 * H1

[0009] H3 = 0.55 * H1 to 0.95 * H1

[0010] Among them: H1 is the height of the inner end point of the steel wire reinforcement layer, H2 is the height of the outer end point of the steel wire reinforcement layer, and H3 is the height of the carcass turn-up end point. H1, H3, and H2 are arranged in a "high, medium, and low" form to avoid stress concentration at exposed ends.

[0011] As a further solution of the present invention: in order to ensure that the overall performance of the tire is not reduced, the inner and outer contours of the sidewall under the improved solution must be guaranteed to be consistent with the inner and outer contours of the original solution, so the following parameters need to be adjusted: reduce W1, W1 is the width of the dividing line between the upper and lower apex rubbers, and reduce the degree of cord twitching of the carcass turnup.

[0012] As a further solution of the present invention: in order to ensure that the overall performance of the tire is not reduced, the inner and outer contours of the sidewall under the improved solution must be guaranteed to be consistent with the inner and outer contours of the original solution. Therefore, the following parameters need to be adjusted: increase the proportion of sidewall rubber with a smaller loss factor, and reduce the proportion of wear-resistant rubber with a larger loss factor.

[0013] As a further solution of the present invention: in order to ensure that the overall performance of the tire is not reduced, the inner and outer contours of the sidewall under the improved solution must be guaranteed to be consistent with the inner and outer contours of the original solution, so the following parameters need to be adjusted: increase H4, H4 is the total height of the upper and lower triangle rubbers, and improve the overall rigidity of the tire bead.

[0014] As a further solution of the present invention: in order to ensure that the overall performance of the tire is not reduced, the inner and outer contours of the sidewall of the improved solution must be guaranteed to be consistent with the inner and outer contours of the original solution, so the following parameters need to be adjusted: improve the smoothness of the decomposition surface of the upper apex rubber and the lower apex rubber, and reduce the stress concentration at the boundary line between the upper apex rubber and the lower apex rubber.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] Under the premise of not changing the inner and outer contours of the existing tire products, the present invention improves the overall rigidity of the tire bead by adjusting the width of the tire body and the steel wire reinforcement layer, the size and shape of the apex rubber, and the proportion of the wear-resistant rubber and the sidewall rubber. While alleviating and avoiding cracks on the bead surface, the bead temperature is reduced, thereby improving the durability of the bead. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a curve diagram of the radial strain on the sidewall surface of the FEA in the present invention.

[0019] Figure 3 It is the heat generation rate of the FEA ring part in the original scheme of the present invention.

[0020] Figure 4 This is the heat generation rate of the FEA ring part in the improved solution of the present invention.

[0021] Figure 5 Schematic diagram of temperature measurement point A in the present invention

[0022] Figure 6 Temperature measurement data graph of temperature point A in the present invention

[0023] Wherein: 1. Inner liner rubber; 2. Carcass; 3. Steel wire reinforcement layer; 4. Upper triangular rubber; 5. Lower triangular rubber; 6. Bead wire; 7. Wear-resistant rubber; 8. Sidewall rubber; 9. Sidewall profile rubber Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention

[0025] Please refer to Figures 1-6 , in the embodiment of the present invention, a tire for improving surface cracking of the bead part includes a carcass 2, a lower triangular rubber 5 is arranged at the bottom of the reverse wrapping groove of the carcass 2, a bead wire 6 is arranged inside the lower triangular rubber 5, an upper triangular rubber 4 is arranged at one end of the lower triangular rubber 5 close to the end of the reverse wrapping groove of the carcass 2, the upper triangular rubber 4 is closely attached to the side wall of the carcass 2 and extends out of the reverse wrapping groove of the carcass 2, a steel wire reinforcement layer 3 is covered on the bead of the carcass 2, an inner liner rubber 1 is arranged on the inner sides of the carcass 2 and the steel wire reinforcement layer 3, a sidewall profile rubber 9 is arranged on the outer sides of the upper triangular rubber 4, the carcass 2 and the steel wire reinforcement layer 3, a wear-resistant rubber 7 is arranged on the lower ends of the inner liner rubber 1 and the steel wire reinforcement layer 3 and on the side wall of the sidewall profile rubber 9, and a sidewall rubber 8 is arranged on the side walls of the wear-resistant rubber 7, the sidewall profile rubber 9, the upper triangular rubber 4 and the carcass 2

[0026] The steel wire reinforcement layer 3 should satisfy

[0027] H2 = 0.3 * H1 to 0.8 * H1

[0028] H3 = 0.55 * H1 to 0.95 * H1

[0029] Wherein: H1 is the height of the inner end point of the steel wire reinforcement layer, H2 is the height of the outer end point of the steel wire reinforcement layer, and H3 is the height of the reverse wrapping end point of the carcass, so that H1, H3, and H2 are arranged in the form of "high, medium, and low" to avoid stress concentration at the exposed end points

[0030] In order to ensure that the overall performance of the tire does not decline, the inner and outer profiles of the sidewall under the improvement scheme should be guaranteed to be the same as those of the original scheme. Therefore, the following parameters need to be adjusted

[0031] a. Reduce W1. W1 is the width of the boundary line between the upper and lower triangular rubbers, and reduce the twitching degree of the cord in the reverse wrapping of the carcass 2;

[0032] b. Increase the proportion of the sidewall rubber 9 with a smaller loss factor and reduce the proportion of the wear-resistant rubber 7 with a larger loss factor;

[0033] c. Increase H4. H4 is the total height of the upper and lower triangular rubbers, and increase the overall rigidity of the bead;

[0034] d. Improve the smoothness of the decomposition surface of the upper triangular rubber 4 and the lower triangular rubber 5, and reduce the stress concentration at the boundary line between the upper triangular rubber 4 and the lower triangular rubber 5.

[0035] Simulation verification of the improvement plan:

[0036] Reference Figure 2 It can be seen that under the improvement plan, the overall surface radial strain of the sidewall is relatively low, which reduces the probability of cracking on the bead surface from a mechanical aspect.

[0037] Reference Figure 3 and Figure 4 It can be seen that the heat generation rate of the bead of the improvement plan is significantly reduced, which reduces the probability of thermal-oxidative aging on the bead surface.

[0038] Indoor test verification of the improvement plan:

[0039] Reference Figure 5 and Figure 6 It can be seen that starting from the center of the above-mentioned waterproof line and determining the temperature measurement point A (the area where the surface cracking of the bead is concentrated) at an interval of 10 mm, applying the same air pressure and load as in the market use to the tire through the indoor drum test, and detecting the temperature every 3 hours. The temperature on the bead surface of the improvement plan is significantly lower than that of the original plan, indicating that the probability of thermal-oxidative aging on its surface is reduced.

[0040] Outdoor test verification of the improvement plan:

[0041] In the outdoor test of the original plan, bead cracking occurred after 6 months. In the outdoor test of the improvement plan, bead cracking did not occur after 6 months, effectively improving the cracking situation on the bead surface of the tire.

[0042] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

Claims

1. A tire for improving cracking of the tire bead surface, comprising a tire body (2), a lower apex rubber (5) is arranged at the bottom of the turned-up groove of the tire body (2), a wire ring (6) is arranged inside the lower apex rubber (5), an upper apex rubber (4) is arranged at one end of the lower apex rubber (5) close to the end of the turned-up groove of the tire body (2), the upper apex rubber (4) is closely attached to the side wall of the tire body (2) and extends out of the turned-up groove of the tire body (2), and the toe of the tire body (2) is covered with a steel wire reinforcement The tire body (2) and the steel wire reinforcement layer (3) are provided with an inner lining rubber (1) on the inner side of the tire body (2) and the steel wire reinforcement layer (3); the outer side of the upper apex rubber (4), the tire body (2) and the steel wire reinforcement layer (3) are provided with a sidewall rubber (9); the lower end of the inner lining rubber (1) and the steel wire reinforcement layer (3) and the sidewall of the sidewall rubber (9) are provided with a wear-resistant rubber (7); the wear-resistant rubber (7), the sidewall rubber (9), the upper apex rubber (4) and the sidewall of the tire body (2) are provided with a sidewall rubber (8); It is characterized in that The steel wire reinforcement layer (3) should meet the following requirements: H2=0.3*H1~0.8*H1 H3=0.55*H1~0.95*H1 Among them: H1 is the height of the inner end point of the steel wire reinforcement layer, H2 is the height of the outer end point of the steel wire reinforcement layer, and H3 is the height of the carcass turn-up end point. H1, H3, and H2 are arranged in a "high, medium, and low" form to avoid stress concentration at the exposed end points.

2. The tire for improving surface cracking of the bead part according to claim 1, wherein In order to ensure that the overall performance of the tire does not decline, the inner and outer contours of the sidewall under the improved solution must be consistent with those of the original solution. Therefore, the following parameters need to be adjusted: reduce W1, W1 is the width of the dividing line between the upper and lower apex rubbers, and reduce the degree of cord twitching of the carcass (2).

3. A tire for improving surface cracking of the bead portion according to claim 1, wherein, In order to ensure that the overall performance of the tire does not decline, the inner and outer contours of the sidewall under the improved solution must be consistent with the inner and outer contours of the original solution. Therefore, the following parameters need to be adjusted: increase the proportion of the sidewall rubber (9) with a smaller loss factor, and reduce the proportion of the wear-resistant rubber (7) with a larger loss factor.

4. A tire for improving surface cracking of the bead portion according to claim 1, characterized in that, In order to ensure that the overall performance of the tire does not decline, the inner and outer contours of the sidewall under the improved solution must be consistent with those of the original solution. Therefore, the following parameters need to be adjusted: increase H4, H4 is the total height of the upper and lower triangle rubbers, and improve the overall rigidity of the tire bead.

5. A tire for improving surface cracking of the bead portion according to claim 1, wherein, In order to ensure that the overall performance of the tire is not reduced, the inner and outer contours of the sidewall of the improved solution must be consistent with those of the original solution. Therefore, the following parameters need to be adjusted: improve the smoothness of the decomposition surface of the upper apex rubber (4) and the lower apex rubber (5), and reduce the stress concentration at the boundary line between the upper apex rubber (4) and the lower apex rubber (5).

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