Tire capable of improving surface cracking of ring part

Abstract

The utility model discloses a tire capable of improving surface cracking of a ring part, which relates to the technical field of tires and 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] This utility model relates to the field of tire technology, specifically a tire that improves surface cracking of the rim. Background Technology

[0002] The tire sidewall is the main flexural component of a tire, closely related to its load-bearing capacity, comfort, rolling resistance, and durability. With the rapid development of new energy vehicles, compared to traditional gasoline vehicles, new energy vehicles experience increased weight due to their battery systems, higher torque during start-up and steering, and faster response. This places more stringent stress and strain on the tire sidewall. The rubber molecules on the tire surface are subjected to both thermal and oxidative aging and mechanical loads. As mileage increases, the bead surface, being a stress concentration zone, is prone to cracking first. This not only affects the tire's appearance but also poses certain safety hazards. Therefore, appropriate design methods are needed during the tire design phase to mitigate or prevent bead surface cracking.

[0003] To address the aforementioned problems, an improved tire with reduced surface cracking at the rim is now designed. Utility Model Content

[0004] The purpose of this invention is to provide a tire that improves surface cracking of the rim, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A tire for improving surface cracking of the tire bead includes a tire carcass. A lower triangular rubber is provided at the bottom of the inverted groove of the tire carcass, and a steel wire ring is provided inside the lower triangular rubber. An upper triangular rubber is provided at one end of the lower triangular rubber near the end of the inverted groove of the tire carcass. The upper triangular rubber is in close contact with the sidewall of the tire carcass and extends out of the inverted groove of the tire carcass. A steel wire reinforcement layer is covered on the bead of the tire carcass. An inner liner rubber is provided inside the tire carcass and the steel wire reinforcement layer. A sidewall rubber is provided outside the upper triangular rubber, the tire carcass, and the steel wire reinforcement layer. A wear-resistant rubber is provided at the lower end of the inner liner rubber and the steel wire reinforcement layer and on the sidewall of the sidewall rubber. A sidewall rubber is provided on the wear-resistant rubber, the sidewall rubber, the upper triangular rubber, and the sidewall of the tire carcass.

[0007] As a further embodiment of this utility model, the steel wire reinforcing layer should meet the following requirements:

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

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

[0010] 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 end point of the carcass wrapping. The arrangement of H1, H3, and H2 is a "high-medium-low" pattern to avoid stress concentration at the exposed end points.

[0011] As a further improvement of this utility model: In order to ensure that the overall performance of the tire does not decline, the inner and outer contours of the tire 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: reduce W1, where W1 is the width of the dividing line between the upper and lower triangular rubbers, and reduce the degree of cord pull-out of the tire body reverse wrapping.

[0012] As a further improvement of this utility model: in order to ensure that the overall performance of the tire does not decline, the inner and outer contours of the tire 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 with a smaller loss factor and decrease the proportion of the wear-resistant rubber with a larger loss factor.

[0013] As a further improvement of this utility model: in order to ensure that the overall performance of the tire does not decrease, the inner and outer contours of the tire 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 H4, where H4 is the total height of the upper and lower triangular rubber, and improve the overall rigidity of the tire bead.

[0014] As a further improvement of this utility model: in order to ensure that the overall performance of the tire does not decline, the inner and outer contours of the tire 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: improve the smoothness of the decomposition surfaces of the upper and lower triangular rubbers, and reduce the stress concentration at the boundary line between the upper and lower triangular rubbers.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention improves the overall rigidity of the tire bead by adjusting the width of the tire carcass and steel wire reinforcement layer, the size and shape of the triangular rubber, and the proportion of wear-resistant rubber and sidewall rubber, without changing the inner and outer contours of existing tire products. This reduces and prevents surface cracking of the bead while lowering the bead temperature and improving the durability of the tire bead. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a curve of radial strain on the tire sidewall surface under FEA in this utility model.

[0019] Figure 3 The heat generation rate of the FEA coil in the original scheme of this utility model is [not specified].

[0020] Figure 4 The improved heat generation rate of the FEA coil in this utility model is achieved.

[0021] Figure 5 This is a schematic diagram of temperature measuring point A in this utility model.

[0022] Figure 6 This is a graph showing the temperature measurement data at temperature point A in this utility model.

[0023] The components are: 1. Inner liner rubber; 2. Tire body; 3. Steel wire reinforcement layer; 4. Upper triangular rubber; 5. Lower triangular rubber; 6. Steel wire bead; 7. Abrasion-resistant rubber; 8. Sidewall rubber; 9. Sidewall profile rubber. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-6 In this embodiment of the present invention, a tire for improving surface cracking of the tire body includes a tire carcass 2. A lower triangular rubber 5 is provided at the bottom of the inverted groove of the tire carcass 2. A steel wire ring 6 is provided inside the lower triangular rubber 5. An upper triangular rubber 4 is provided at one end of the lower triangular rubber 5 near the end of the inverted groove of the tire carcass 2. The upper triangular rubber 4 is closely attached to the sidewall of the tire carcass 2 and extends out of the inverted groove of the tire carcass 2. A steel wire reinforcement layer 3 is covered on the toe of the tire carcass 2. An inner liner rubber 1 is provided on the inner side of the tire carcass 2 and the steel wire reinforcement layer 3. A sidewall rubber 9 is provided on the outer side of the upper triangular rubber 4, the tire carcass 2 and the steel wire reinforcement layer 3. A wear-resistant rubber 7 is provided on the lower end of the inner liner rubber 1 and the steel wire reinforcement layer 3 and on the sidewall of the sidewall rubber 9. A sidewall rubber 8 is provided on the wear-resistant rubber 7, the sidewall rubber 9, the upper triangular rubber 4 and the sidewall of the tire carcass 2.

[0026] The steel wire reinforcing layer 3 should meet the following requirements:

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

[0028] H3 = 0.55 * H1 ~ 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 end point of the carcass wrapping. The arrangement of H1, H3, and H2 is a "high-medium-low" pattern to avoid stress concentration at the exposed end points.

[0030] To ensure that the overall tire performance does not degrade, the inner and outer contours of the tire sidewall in the improved design must be consistent with those in the original design. Therefore, the following parameters need to be adjusted:

[0031] a. Reduce W1, where W1 is the width of the dividing line between the upper and lower triangular rubbers, to reduce the degree of cord pull-out in the reverse wrapping of the tire body 2.

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

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

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

[0035] Simulation verification improvement plan:

[0036] refer to Figure 2 It can be seen that the surface radial strain of the tire sidewall is generally lower under the improved scheme, which reduces the probability of surface cracking of the bead from a mechanical point of view.

[0037] refer to Figure 3 and Figure 4 It can be seen that the improved solution significantly reduces the heat generation rate of the tire bead, thereby reducing the probability of thermo-oxidative aging on the bead surface.

[0038] Indoor testing and verification improvement plan:

[0039] refer to Figure 5 and Figure 6 As can be seen, with the center of the above waterproof line as the starting point and a spacing of 10mm, temperature measurement point A (the area where cracks are concentrated on the surface of the tire) was determined. Through indoor drum test, the tire was subjected to the same air pressure and load as that used in the market. The temperature was measured every 3 hours. The temperature of the tire surface of the improved solution was significantly lower than that of the original solution, indicating that the probability of thermal oxidative aging on its surface was reduced.

[0040] Outdoor testing and verification improvement plan:

[0041] The original solution showed rim cracking after 6 months of outdoor testing, while the improved solution did not show rim cracking after 6 months of outdoor testing, effectively improving the surface cracking of the tire rim.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention.

Claims

1. A tire for improving surface cracking of the tire bead, comprising a tire carcass (2), wherein a lower triangular rubber (5) is provided at the bottom of the inverted groove of the tire carcass (2), a steel wire ring (6) is provided inside the lower triangular rubber (5), an upper triangular rubber (4) is provided at one end of the lower triangular rubber (5) near the end of the inverted groove of the tire carcass (2), the upper triangular rubber (4) is in close contact with the sidewall of the tire carcass (2) and extends out of the inverted groove of the tire carcass (2), and the bead of the tire carcass (2) is covered with steel wire reinforcement. Layer (3), the inner side of the carcass (2) and the steel wire reinforcement layer (3) is provided with inner liner rubber (1), the outer side of the upper triangular rubber (4), the carcass (2) and the steel wire reinforcement layer (3) is provided with sidewall rubber (9), the lower end of the inner liner rubber (1) and the steel wire reinforcement layer (3) and the sidewall of the sidewall rubber (9) are provided with wear-resistant rubber (7), the wear-resistant rubber (7), the sidewall rubber (9), the upper triangular rubber (4) and the sidewall of the carcass (2) are provided with sidewall rubber (8); Its features are, 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 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 end point of the carcass wrapping. The arrangement of H1, H3, and H2 is "high, medium, and low" to avoid stress concentration at the exposed end points.

2. The tire for improving surface cracking of the rim as described in 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 tire sidewall under the improved plan must be consistent with the inner and outer contours of the original plan. Therefore, the following parameters need to be adjusted: reduce W1, where W1 is the width of the upper and lower triangular rubber dividing line, and reduce the degree of cord pull-out of the tire body (2) reverse wrapping.

3. A tire for improving surface cracking of the rim as described in 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 tire sidewall under the improved scheme must be consistent with the inner and outer contours of the original scheme. Therefore, the following parameters need to be adjusted: increase the proportion of the tire sidewall rubber (9) with a smaller loss factor and decrease the proportion of the wear-resistant rubber (7) with a larger loss factor.

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

5. A tire for improving surface cracking of the rim 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 tire sidewall under the improved scheme must be consistent with the inner and outer contours of the original scheme. Therefore, the following parameters need to be adjusted: 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).

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