Light overload tire bead structure of all-steel radial mine tire

Abstract

The invention discloses a light overload tire bead structure of an all-steel radial mine tire, which relates to the technical field of tires and specifically comprises a lining layer, a carcass ply, a nylon reinforcement, a steel wire reinforcement, a steel wire ring, a lower apex rubber core, seam allowance wear-resistant rubber, sidewall rubber and an upper apex rubber core, a steel wire reinforcement is arranged on the outer side of the carcass ply, a nylon reinforcement is arranged on the side, close to the lining layer, of the steel wire reinforcement, and the upper end of the nylon reinforcement is located in the upper area of the tire and attached to the lining layer and the carcass ply; the lower end of the nylon reinforcement extends to the inner side of the area where the steel wire ring of the tire bead structure is located and is attached to the steel wire reinforcement and the lining layer. The stress distribution of the tire bead part in the inflating and loading states is adjusted by changing the reinforcing material at the tire bead position and the stress stepped distribution structure design, and particularly through application and adjustment of nylon reinforcement, the production efficiency is improved, the material of the inner side of the tire bead is optimized, the bearing resistance is achieved, meanwhile, the ring part material is reduced, and the tire strain and heat generation are reduced.

Description

Technical Field

[0001] This invention relates to the field of tires, specifically to a lightweight overload bead structure for an all-steel radial mining tire. Background Technology

[0002] All-steel radial tires, especially 20-inch inner tube mining tires, operate under high load and high pressure conditions, subjecting the bead area to significant internal tire pressure stress and external load forces. Furthermore, the bead area is a complex region where various rubber components and carcass materials converge, resulting in substantial stress, strain, and strain energy. Therefore, 20-inch inner tube mining tires require a bead area with strong support rigidity and a reasonable material distribution gradient. Existing traditional bead structures (as per the instruction manual)... Figure 1 (As shown) includes: 1. Inner liner; 2. Carcass cord; 3. Steel wire reinforcement; 4. Steel wire bead; 5. Lower triangular rubber core; 6. Bead abrasion-resistant rubber; 7. Nylon reinforcement; 8. Sidewall rubber; 9. Upper triangular rubber core.

[0003] The existing bead structure, when used under light overload conditions, has a significant impact on workshop production efficiency due to the two layers of nylon being fed and the cross-bonding operation between the nylons. In terms of load performance, the bead failure rate is relatively high in the early and mid-stages, mainly due to cracking or detachment at the end of the carcass cord in the bead area, as well as bursting at the bead area caused by the above problems.

[0004] The technical problem to be solved by the present invention is to provide a more easily operable, more reasonably stress-distributed light overload bead structure for all-steel radial tires through a brand-new bead structure, thereby improving the tire bead durability. Summary of the Invention

[0005] This application proposes a lightweight overload bead structure for all-steel radial mining tires, which has the following advantages: by optimizing the distribution of bead material and the nylon reinforcement, the durability and load-bearing capacity of the tire bead are improved, thus solving the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this application adopts the following technical solution: a light overload bead structure for an all-steel radial mining tire, comprising an inner liner, tire carcass ply, nylon reinforcement, steel wire reinforcement, steel wire bead, lower triangular rubber core, bead wear-resistant rubber, sidewall rubber, and upper triangular rubber core.

[0007] The outer side of the tire carcass cord is reinforced with steel wire, and the side of the steel wire reinforcement close to the inner liner is reinforced with nylon. The upper end of the nylon reinforcement is located in the upper region of the tire and is in contact with the inner liner and the tire carcass cord. The lower end of the nylon reinforcement extends to the inner side of the area where the steel wire ring of the bead structure is located and is in contact with the steel wire reinforcement and the inner liner.

[0008] The relationship between the height H6 of the upper end of the lower triangular rubber core and the tire body height H is: H6 / H = 1.50~1.52;

[0009] The relationship between the height H2 of the inner end of the steel wire reinforcement and the tire body height H is: H2 / H = 1.51~1.53;

[0010] The relationship between the height H4 of the upper end of the upper triangular rubber core and the tire body height H is: H4 / H = 2.29~2.31;

[0011] The relationship between the height H5 of the upper end of the wear-resistant rubber and the height H of the tire body is: H5 / H = 1.42~1.44.

[0012] The relationship between the thickness W1 at the end of the inverted end of the tire carcass and the distance W2 from the outer side of the tire carcass is W1 / W2 = 1.03 to 1.05; the relationship between the thickness W1 at the end of the inverted end of the tire carcass and the thickness W of the tire bead is W1 / W = 0.46 to 0.48.

[0013] Preferably, the inner liner is located inside the bead, and the outer top of the inner liner is attached to the tire carcass cord.

[0014] Preferably, the tire carcass cord extends downward to wrap around the steel wire ring, and the tire carcass cord extends upward to the upper part of the tire.

[0015] Preferably, the bead abrasion-resistant rubber is located outside the lower triangular rubber core, covering the lower part and bottom of the tire carcass cord, and the upper end of the bead abrasion-resistant rubber extends above the outer end of the steel wire reinforcement.

[0016] Preferably, a lower triangular rubber core is provided above the steel wire ring, and an upper triangular rubber core is provided above the lower triangular rubber core. Both the lower triangular rubber core and the upper triangular rubber core are located in the reverse wrapping area of ​​the tire carcass cord.

[0017] Preferably, the sidewall rubber is located outside the upper triangular rubber core and is attached to the outside of the tire carcass cord, with its lower end wrapping the upper end of the bead abrasion-resistant rubber.

[0018] Preferably, the height of the inner end point of the steel wire reinforcement is above the height of the outer end point of the tire carcass cord, and the distance between the outer end point of the tire carcass cord and the outer side of the bead abrasion-resistant rubber is W2.

[0019] Preferably, the connecting surface between the lower triangular rubber core and the upper triangular rubber core is arc-shaped. The upper and middle sections of the connecting surface are both inwardly convex and concave arc-shaped segments, with the radius of the upper section being larger than the radius of the middle section, but the central angle of the middle section being larger than the central angle of the upper section. The lower section of the connecting surface is an outwardly convex arc-shaped segment, and both the upper and lower ends of the connecting surface are in contact with the inner surface of the tire carcass ply.

[0020] Preferably, the bottom end of the upper section of the connecting surface is located inside the outer end of the tire carcass cord, and the upper end of the connecting surface is located above the steel wire reinforcement.

[0021] Preferably, the upper end of the wear-resistant rubber is embedded in the sidewall rubber, and the interface between the two is stepped.

[0022] The present invention has the following beneficial effects:

[0023] 1. By changing the reinforcing material and stress gradient distribution structure at the bead location, the stress distribution at the bead under inflation and loading conditions can be adjusted. In particular, the application and adjustment of nylon reinforcement improves production efficiency and optimizes the material inside the bead, reducing bead material while increasing load resistance, thereby reducing tire strain and heat generation.

[0024] 2. By setting the arc-shaped connection surface between the upper and lower triangular rubber cores, the load is evenly distributed over a larger contact area, reducing local stress peaks, extending the service life of the triangular rubber cores, and effectively preventing relative slippage and peeling between layers during dynamic driving, thus reducing the probability of tire failure.

[0025] 3. Through the mechanical interlocking of the bead wear-resistant rubber and the sidewall rubber, the probability of delamination and peeling between the two during dynamic use is reduced, thereby reducing the probability of bead bursting, improving tire durability, and achieving seamless internal sealing. Attached Figure Description

[0026] Figure 1 A schematic diagram of the traditional 20-inch heavy-duty mining tire bead structure;

[0027] Figure 2 This is a schematic diagram of a lightweight overload bead structure for an all-steel radial mining tire proposed in this application;

[0028] Figure 3 To Figure 2 A diagram with annotations.

[0029] In the diagram: 1. Inner liner; 2. Carcass ply; 3. Nylon reinforcement; 4. Steel wire reinforcement; 5. Steel wire bead; 6. Lower triangular rubber core; 7. Bead wear-resistant rubber; 8. Sidewall rubber; 9. Upper triangular rubber core. Detailed Implementation

[0030] The technical solution of the present invention will be clearly and completely described below with reference to preferred embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figure 2 and Figure 3 As shown, a lightweight overload bead structure for an all-steel radial mining tire includes an inner liner 1, a carcass cord 2, a nylon reinforcement 3, a steel wire reinforcement 4, a steel wire bead 5, a lower triangular rubber core 6, a bead wear-resistant rubber 7, a sidewall rubber 8, and an upper triangular rubber core 9.

[0032] The tire consists of: an inner liner 1 located inside the bead, with a carcass cord 2 attached to its outer top. The carcass cord 2 extends downwards to wrap around the steel wire ring 5 and upwards to the upper part of the tire. A steel wire reinforcement 4 is provided on the outer side of the carcass cord 2, and a nylon reinforcement 3 is provided on the side of the steel wire reinforcement 4 closest to the inner liner 1. The upper end of the nylon reinforcement 3 is located in the upper region of the tire, attached to the inner liner 1 and the carcass cord 2. The application of the nylon reinforcement 3 can improve the load-bearing capacity of the bead structure, thereby improving the bead durability and extending the service life of the tire. The lower end of the nylon reinforcement 3 extends to the inner side of the area where the steel wire ring 5 of the bead structure is located, and is attached to the steel wire reinforcement 4 and the inner liner 1.

[0033] The height of the inner end of the steel wire reinforcement 4 is above the height of the outer end of the carcass cord 2, providing upward and inward tightening force for the bead structure, gathering and fixing the carcass cord 2, reducing the probability of deformation and cracking of the bead structure, extending the durability of the bead structure, optimizing stress distribution, providing additional support for the carcass cord 2, and preventing the carcass cord 2 from cracking. The distance between the outer end of the carcass cord 2 and the outer side of the bead abrasion lining 7 is W2.

[0034] A lower triangular rubber core 6 is positioned above the steel wire ring 5, and an upper triangular rubber core 9 is positioned above the lower triangular rubber core 6. Both the lower triangular rubber core 6 and the upper triangular rubber core 9 are located in the reverse wrapping area of ​​the tire carcass ply 2. The connecting surface between the lower triangular rubber core 6 and the upper triangular rubber core 9 is arc-shaped. The upper and middle sections of the connecting surface are both inwardly convex and concave arc-shaped segments, and the radius of the upper section of the connecting surface is larger than the radius of the middle section, but the central angle of the middle section of the connecting surface is larger than the central angle of the upper section. The lower section of the connecting surface is an outwardly convex arc-shaped segment, and both the upper and lower ends of the connecting surface are in contact with the inner surface of the tire carcass ply 2. The bottom end of the upper section of the connecting surface is located inside the outer end point of the tire carcass ply 2, and the upper end of the connecting surface is located above the steel wire reinforcement 4. By setting the arc-shaped connecting surface, the load is evenly distributed to a larger contact area, reducing local stress peaks, extending the service life of the triangular rubber core, and effectively preventing relative slippage and peeling between layers during dynamic driving, reducing the probability of tire failure. It can also properly cover and protect the underlying steel wire reinforcement 4 without compressing or interfering with it.

[0035] The bead abrasion-resistant rubber 7 is located outside the lower triangular rubber core 6, covering the lower part and bottom of the tire carcass ply 2, and the upper end of the bead abrasion-resistant rubber 7 extends above the outer end of the steel wire reinforcement 4. The sidewall rubber 8 is located outside the upper triangular rubber core 9, adhering to the outer side of the tire carcass ply 2, and its lower end wraps around the upper end of the bead abrasion-resistant rubber 7. The upper end of the bead wear-resistant rubber 7 is embedded in the sidewall rubber 8, and the interface between the two is stepped, realizing the mechanical interlocking of the bead wear-resistant rubber 7 and the sidewall rubber 8. This prevents the two rubber materials from delaminating and peeling during dynamic use, effectively restricting the lateral and longitudinal movement of the bead wear-resistant rubber relative to the sidewall rubber, ensuring the shape and dimensional accuracy of the tire bead area, facilitating tire assembly, optimizing stress distribution, and progressively transferring loads. It disperses the concentrated stress on the bead area to a larger area of ​​the sidewall rubber, avoiding early damage caused by local stress concentration, improving durability, and enhancing sealing and airtightness. It prevents air and moisture from seeping in from the internal joints, protects the tire carcass cord and steel wire from corrosion, and extends tire life.

[0036] The relationship between the height H6 of the upper end of the lower triangular rubber core 6 and the tire body height H is: H6 / H = 1.50~1.52;

[0037] The relationship between the height H2 of the inner end of the steel wire reinforcement 4 and the tire body height H is: H2 / H = 1.51~1.53;

[0038] The relationship between the height H4 of the upper end of the upper triangular rubber core 9 and the tire body height H is: H4 / H = 2.29~2.31;

[0039] The relationship between the height H5 of the upper end of the wear-resistant rubber 7 and the height H of the tire body is: H5 / H = 1.42~1.44.

[0040] The relationship between the thickness W1 at the end of the inverted carcass and the distance W2 from the outer side of the carcass is W1 / W2 = 1.03 to 1.04; the relationship between the thickness W1 at the end of the inverted carcass and the thickness W of the bead is W1 / W = 0.46 to 0.48.

[0041] Preferably, the relationship between the height H6 of the upper end of the lower triangular rubber core 6 and the tire body height H is: H6 / H = 1.51;

[0042] The relationship between the height H2 of the inner end of the steel wire reinforcement 4 and the tire body height H is: H2 / H=1.52;

[0043] The relationship between the height H4 of the upper end of the upper triangular rubber core 9 and the tire body height H is: H4 / H = 2.30;

[0044] The relationship between the height H5 of the upper end of the wear-resistant rubber 7 and the height H of the tire body is: H5 / H = 1.43.

[0045] The relationship between the thickness W1 at the end of the carcass wrapping around the tire and the distance W2 from the outer side of the carcass is W1 / W2 = 1.04; the relationship between the thickness W1 at the end of the carcass wrapping around the tire and the thickness W of the bead is W1 / W = 0.47.

[0046] Application effect:

[0047] The performance of tires manufactured using the all-steel radial mining tire light overload bead structure and tires using the original bead structure were compared and tested, as shown in the table below:

[0048]

[0049] Based on the data in Table 1, the tire bead durability of this application can be evaluated: the new tire bead structure is superior to the original tire bead structure. Furthermore, tires manufactured using the described method and incorporating the described tire bead structure underwent durability testing in indoor environments simulating harsh driving conditions. The final number of driving hours was used as a key indicator of tire bead load-bearing performance; the tire bead durability test showed increasingly superior performance over time. The applicant has already applied the new structure to the Linglong 12.00R20 DO998L tire, and the indoor tire bead durability test results are more than twice that of the original product.

[0050] In summary, the novel lightweight overload bead structure for mining tires provided in this application demonstrates remarkable effectiveness in reducing bead stress, enhancing bead load-bearing capacity, and extending service life. This application adjusts the stress distribution at the bead location under inflation and loading conditions by modifying the reinforcing material and stress gradient distribution structure at the bead position. In particular, the application and adjustment of nylon reinforcement improves production efficiency and optimizes the material on the inner side of the bead, increasing load-bearing capacity while reducing bead material, thus lowering tire strain and heat generation.

Claims

1. A lightweight overload bead structure for an all-steel radial mining tire, characterized in that: It includes the inner liner (1), carcass ply (2), nylon reinforcement (3), steel wire reinforcement (4), steel wire ring (5), lower triangular rubber core (6), bead wear-resistant rubber (7), sidewall rubber (8) and upper triangular rubber core (9); The outer side of the tire carcass ply (2) is provided with a steel wire reinforcement (4), and the side of the steel wire reinforcement (4) close to the inner liner (1) is provided with a nylon reinforcement (3). The upper end of the nylon reinforcement (3) is located in the upper region of the tire and is in contact with the inner liner (1) and the tire carcass ply (2). The lower end of the nylon reinforcement (3) extends to the inner side of the area where the steel wire ring (5) of the bead structure is located and is in contact with the steel wire reinforcement (4) and the inner liner (1). The relationship between the height H6 of the upper end of the lower triangular rubber core (6) and the tire height H is: H6 / H = 1.50~1.52; The relationship between the height H2 of the inner end point of the steel wire reinforcement (4) and the tire body height H is: H2 / H = 1.51~1.53; The relationship between the height H4 of the upper end point of the upper triangular rubber core (9) and the tire body height H is: H4 / H = 2.29~2.31; The relationship between the height H5 of the upper end of the wear-resistant rubber (7) and the height H of the tire body is: H5 / H = 1.42~1.

44. The relationship between the thickness W1 at the end of the inverted end of the tire carcass and the distance W2 from the outer side of the tire carcass is W1 / W2 = 1.03 to 1.05; the relationship between the thickness W1 at the end of the inverted end of the tire carcass and the thickness W of the tire bead is W1 / W = 0.46 to 0.

48.

2. The all-steel radial mining tire light overload bead structure according to claim 1, characterized in that: The inner liner (1) is located inside the bead, and the outer side of its top is attached with the carcass cord (2).

3. The all-steel radial mining tire light overload bead structure according to claim 1, characterized in that: The tire carcass cord (2) extends downward to wrap around the steel wire ring (5), and the tire carcass cord (2) extends upward to the upper part of the tire.

4. The lightweight overload bead structure for an all-steel radial mining tire according to claim 1, characterized in that: The bead wear-resistant rubber (7) is located on the outside of the lower triangular rubber core (6), covering the lower part and bottom of the tire carcass cord (2), and the upper end of the bead wear-resistant rubber (7) extends above the outer end of the steel wire reinforcement (4).

5. The lightweight overload bead structure for an all-steel radial mining tire according to claim 1, characterized in that: A lower triangular rubber core (6) is provided above the wire ring (5), and an upper triangular rubber core (9) is provided above the lower triangular rubber core (6). Both the lower triangular rubber core (6) and the upper triangular rubber core (9) are located in the reverse wrapping area of ​​the tire carcass cord (2).

6. The all-steel radial mining tire light overload bead structure according to claim 1, characterized in that: The sidewall rubber (8) is located outside the upper triangular rubber core (9) and is attached to the outside of the tire carcass cord (2), with its lower end wrapping the upper end of the bead wear-resistant rubber (7).

7. The all-steel radial mining tire light overload bead structure according to claim 1, characterized in that: The height of the inner end of the steel wire reinforcement (4) is above the height of the outer end of the tire carcass (2), and the distance between the outer end of the tire carcass (2) and the outer side of the tire bead abrasion-resistant rubber (7) is W2.

8. The lightweight overload bead structure for an all-steel radial mining tire according to claim 1, characterized in that: The connecting surface between the lower triangular rubber core (6) and the upper triangular rubber core (9) is arc-shaped. The upper and middle sections of the connecting surface are both inwardly convex and concave arc-shaped sections, and the radius of the upper section of the connecting surface is greater than the radius of the middle section, but the central angle of the middle section of the connecting surface is greater than the central angle of the upper section. The lower section of the connecting surface is an outwardly convex arc-shaped section, and the upper and lower ends of the connecting surface are in contact with the inner surface of the tire carcass cord (2).

9. The all-steel radial mining tire light overload bead structure according to claim 8, characterized in that: The bottom end of the upper section of the connecting surface is located inside the outer end of the tire carcass (2), and the upper end of the connecting surface is located above the steel wire reinforcement (4).

10. The lightweight overload bead structure for an all-steel radial mining tire according to claim 1, characterized in that: The upper end of the wear-resistant rubber (7) is embedded in the sidewall rubber (8), and the interface between the two is stepped.

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