Tire bead structure of all-steel radial tubeless tire special for bus

Abstract

The utility model discloses a tire bead structure of an all-steel radial tubeless tire special for a bus, and belongs to the technical field of tires. The tire bead structure of the all-steel radial tubeless tire special for the bus comprises a sidewall rubber area, a wear-resistant rubber area, a filling rubber area, an aramid cord fabric area, a steel wire wrapping cloth area, a tire body steel cord area, a lining layer area, an upper apex area, a lower apex area and a steel wire ring area. The utility model has the main characteristics that the process and process stability is good, the aramid cord fabric is used for isolating the tire body from the steel ladle end point, the pleating problem is avoided, the exhaust property is better, the sidewall bubbles of the finished tire are avoided, the tire bead strength can be enhanced, the sidewall flexing deformation caused by tire torsion is reduced, and the service life of the tire is prolonged. And when the tire is used, tire side cracks or cracks at the seam allowance part cannot be caused.

Description

Technical Field

[0001] This utility model relates to the field of tire technology, and mainly to the bead structure of a special all-steel radial tire without inner tube for buses. Background Technology

[0002] With the gradual popularization of electric buses, bus companies are placing increasingly higher demands on tire performance. Electric buses are characterized by heavy empty loads, rapid acceleration, and high torsional forces. Therefore, the tire bead area is a weak point for electric bus tire damage. As the load increases, the deformation of the tire bead area gradually increases, and sidewall cracks often appear at the tire carcass or steel ingot end points, which can lead to severe sidewall ruptures.

[0003] Currently, most electric bus tires use a design where wear-resistant rubber is tightly bonded to the steel cord covering. The reversed parts of the tire carcass steel cord and the reversed parts of the steel cord covering directly contact the upper triangular rubber core inside the bead. This causes tire damage to be concentrated at the reversed end of the tire carcass or the end of the steel cord covering, where stress is high. At present, rubber isolation sheets are used to separate the tire carcass from the steel cord covering, thus reducing stress on the tire carcass steel cord and the steel cord covering. However, during the manufacturing process, the rubber isolation sheets are prone to wrinkling or poor venting, which can lead to sidewall blistering defects in the finished tire. This results in significant deformation of the bead area and easy cracking of the sidewall when the vehicle twists. Utility Model Content

[0004] This utility model aims to solve some problems existing in the prior art. Therefore, the purpose of this utility model is to propose a bead structure for a dedicated all-steel radial tubeless tire for buses, which improves the strength of the bead structure, disperses the stress of various materials in the bead area, reduces the deformation of the bead area during vehicle torsion, and thus reduces cracks caused by sidewall flexing.

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

[0006] A bead structure for a bus-specific all-steel radial innerless tire includes a sidewall rubber area, a wear-resistant rubber area, a filler rubber area, an aramid cord area, a steel wire wrapped area, a carcass steel cord area, an inner liner area, an upper triangular rubber area, a lower triangular rubber area, and a steel wire bead area.

[0007] The upper triangular rubber area and the lower triangular rubber area together form a triangular rubber area. The upper triangular rubber area is located near the end face of the bead structure, and the lower triangular rubber area is located inside the bead structure.

[0008] The steel wire ring area is located at the bottom of the lower triangular rubber area;

[0009] The carcass steel cord area is wrapped around the outside of the triangular rubber area;

[0010] The aramid cord area is wrapped around the outside of the carcass steel cord area and the upper triangular rubber area.

[0011] The steel wire wrapped area is wrapped around the outside of the aramid cord area and the carcass steel cord area;

[0012] The inner lining area is wrapped around the outside of the steel wire wrapped area and the carcass steel cord area;

[0013] The wear-resistant rubber zone is located outside the steel wire-wrapped area;

[0014] The filling adhesive area is located between the wear-resistant adhesive area and the steel wire wrapped area;

[0015] The sidewall rubber area is located outside the wear-resistant rubber area.

[0016] Preferably, the carcass steel cord area, the steel wire covering area, and the steel wire covering area all have high points, namely the high point of the reverse wrapping of the carcass steel cord area, the high point of the outer reverse wrapping of the steel wire covering area, and the high point of the outer reverse wrapping of the aramid cord area. The high points of the reverse wrapping of the carcass steel cord area, the high point of the outer reverse wrapping of the steel wire covering area, and the high point of the outer reverse wrapping of the aramid cord area all have heights, namely the height of the reverse wrapping of the carcass steel cord area, the height of the outer reverse wrapping of the steel wire covering area, and the height of the outer reverse wrapping of the aramid cord area.

[0017] Preferably, the height of the outer wrapping of the aramid cord area is greater than the height of the outer wrapping of the steel wire wrapping area, which is greater than the height of the wrapping of the carcass steel cord area.

[0018] Preferably, the sidewall rubber area, the wear-resistant rubber area, and the filler rubber area are combined to form a single structure.

[0019] Preferably, the height of the outer wrapping of the steel wire covering area and the height of the outer wrapping of the carcass steel cord area differ by 12mm-15mm.

[0020] Preferably, the difference between the outer wrapping height of the aramid cord area and the outer wrapping height of the carcass steel cord area is 8mm-12mm.

[0021] Preferably, the wire coil area is arranged at an oblique angle, and the wire coil area is composed of wire coil winding cloth and several wire coils, with the wire coils located in the wire coil winding cloth.

[0022] Preferably, the wire coils are arranged in a 5-6-7-6 pattern from bottom to top.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] The main features of this utility model are good process stability, the use of aramid cord fabric to isolate the tire carcass from the steel ladle end point, which will not cause crease problems, good air release, no sidewall bubbles in the finished tire, and can also enhance the tire bead strength, reduce the sidewall flexing deformation caused by tire torsion, and prevent sidewall cracks or ruptures at the bead area during tire use.

[0025] The features and advantages of this utility model will be described in detail through embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure reference numerals: 1. Sidewall rubber area, 2. Abrasion-resistant rubber area, 3. Filler rubber area, 4. Aramid cord area, 41. High point of outer wrapping of aramid cord area, 5. Steel wire wrapped area, 51. High point of outer wrapping of steel wire wrapped area, 6. Carcass steel cord area, 61. High point of outer wrapping of carcass steel cord area, 7. Inner liner area, 8. Upper triangular rubber area, 9. Lower triangular rubber area, 10. Steel wire bead wrapping cloth, 11. Steel wire bead, H1. Height of outer wrapping of aramid cord area, H2. Height of outer wrapping of steel wire wrapped area, H3. Height of outer wrapping of carcass steel cord area. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0030] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this utility model pertains. The words “a” or “one” and similar terms used in this application specification and claims do not indicate a limitation of quantity, but rather indicate the presence of at least one. “A plurality” includes two, equivalent to at least two. The words “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” covers the element or object listed following “comprising” or “including” and its equivalents, and does not exclude other elements or objects. The words “connected” or “linked” and similar terms are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect. The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] Example 1:

[0032] Please refer to the following for details. Figure 1 A bead structure for a bus-specific all-steel radial innerless tire includes a sidewall rubber area 1, a wear-resistant rubber area 2, a filler rubber area 3, an aramid cord area 4, a steel cord wrapped area 5, a carcass steel cord area 6, an inner liner area 7, an upper triangular rubber area 8, a lower triangular rubber area 9, and a steel cord bead area 11. The upper triangular rubber area 8 and the lower triangular rubber area 9 form a triangular rubber area. The upper triangular rubber area 8 is located near the end face of the bead structure, and the lower triangular rubber area 9 is located inside the bead structure. The steel cord bead area 11 is located at the bottom of the lower triangular rubber area 9. The carcass steel cord area 6... The aramid cord area 4 is wrapped around the outside of the triangular rubber area, the aramid cord area 4 is wrapped around the outside of the carcass steel cord area 6 and the upper triangular rubber area 8, the steel wire wrapped area 5 is wrapped around the outside of the aramid cord area 4 and the carcass steel cord area 6. In other words, the aramid cord area 4 is located between the steel wire wrapped area 5 and the carcass steel cord area 6. The inner liner area 7 is wrapped around the outside of the steel wire wrapped area 5 and the carcass steel cord area 6. The wear-resistant rubber area 2 is located outside of the steel wire wrapped area 5. The filler rubber area 3 is located between the wear-resistant rubber area 2 and the steel wire wrapped area 5. The sidewall rubber area 1 is located outside of the wear-resistant rubber area 2.

[0033] Based on the above technical means: the bead structure of the bus-specific all-steel radial tire without inner tube uses aramid cord fabric to isolate the ends of the steel cord area 6 and the steel wire wrapped area 5 of the tire carcass, which will not cause crease problems, has good air exhaust, and will not produce sidewall bubbles in the finished tire. It can also enhance the tire bead strength, reduce the sidewall flexing deformation caused by tire torsion, and prevent sidewall cracks or ruptures at the bead area during tire use.

[0034] Furthermore, the carcass steel cord area 6, the steel wire covering area 5, and the steel wire covering area 5 all have high points, namely the high point 61 of the reverse wrapping of the carcass steel cord area, the high point 51 of the outer reverse wrapping of the steel wire covering area, and the high point 41 of the outer reverse wrapping of the aramid cord area. The high points 61 of the reverse wrapping of the carcass steel cord area, the high point 51 of the outer reverse wrapping of the steel wire covering area, and the high point 41 of the outer reverse wrapping of the aramid cord area all have heights, namely the reverse wrapping height H3 of the carcass steel cord area, the reverse wrapping height H2 of the outer reverse wrapping of the steel wire covering area, and the reverse wrapping height H1 of the outer reverse wrapping of the aramid cord area.

[0035] A bead structure for a bus-specific all-steel radial tubeless tire uses sidewall rubber, wear-resistant rubber, filler rubber, aramid cord fabric, steel wire wrapping fabric, carcass steel cord, upper triangular rubber, lower triangular rubber, steel wire ring wrapping fabric 10, and steel wire ring 11 as materials for the tire bead area. By adjusting the parameters of each component material, a staggered combination of material distribution is achieved. Specifically, the outer wrapping height H1 of the aramid cord fabric area is greater than the outer wrapping height H2 of the steel wire wrapping fabric area, which is greater than the wrapping height H3 of the carcass steel cord area.

[0036] Furthermore, the three-component extruder is used to combine the sidewall rubber zone 1, the wear-resistant rubber zone 2, and the filler rubber zone 3 into a single structure, facilitating assembly on the molding machine. Its thickness and width are controlled according to the dimensional requirements of the finished tire's bead area, ensuring the tire's resistance to fatigue caused by repeated flexing under load conditions, thus providing protection.

[0037] Furthermore, the steel wire covering uses high-strength steel cord, and its inner and outer sides are distributed in a way that is lower on the inside and higher on the outside. The difference between the outer wrapping height H2 of the steel wire covering area and the outer wrapping height H3 of the tire carcass steel cord area is 12mm-15mm.

[0038] Furthermore, the aramid cord area 4 serves as an isolation layer between the steel wire wrapped area 5 and the carcass steel cord area 6. The difference between the outer wrapping height H1 of the aramid cord area and the outer wrapping height H3 of the carcass steel cord area is 8mm-12mm. Its function is to enhance the strength of the bead area and to isolate and protect the steel wire wrapped area 5 and the carcass steel cord area 6.

[0039] Furthermore, the wire loops in area 11 are arranged at an angle. Area 11 consists of wire loop winding cloth 10 and several wire loops 11. The wire loops 11 are located in the wire loop winding cloth 10. The wire loops 11 are arranged from bottom to top in a 5-6-7-6 pattern, that is, there are 5 wire loops 11 in the bottom layer and 6 wire loops 11 in the top layer, and so on.

[0040] Example 2:

[0041] The rest of this embodiment is the same as that of embodiment 1, except that polyester fabric can replace aramid fabric and can achieve the same effect.

[0042] This utility model discloses a bead structure for a special all-steel radial tubeless tire for buses. The structure uses an aramid cord area to isolate the high point 61 of the carcass steel cord area from the high point 51 of the outer side of the steel cord area. This not only effectively isolates the contact between the carcass steel cord area 6 and the steel cord area 5, but also enhances the strength of the bead area. By adjusting the height H1 of the outer side of the aramid cord area to form a staggered distribution, the problem of stress dispersion can be effectively solved.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A bead structure for a bus-only all-steel radial tubeless tire, characterized by, The tire comprises a sidewall rubber area, a wear-resistant rubber area, a filling rubber area, an aramid cord area, a steel wire wrapping area, a tire body steel cord area, an inner liner area, an upper triangular rubber area, a lower triangular rubber area, and a bead area. The upper triangular rubber area is located at an end surface close to the bead structure, and the lower triangular rubber area is located inside the bead structure. The bead area is located at the bottom of the lower triangular rubber area. The tire body steel cord area is wrapped outside the triangular rubber area. The aramid cord area is wrapped outside the tire body steel cord area and the upper triangular rubber area. The steel wire wrapping area is wrapped outside the aramid cord area and the tire body steel cord area. The inner liner area is wrapped outside the steel wire wrapping area and the tire body steel cord area. The wear-resistant rubber area is located outside the steel wire wrapping area. The filling rubber area is located between the wear-resistant rubber area and the steel wire wrapping area. The sidewall rubber area is located outside the wear-resistant rubber area.

2. The bead structure of a bus radial tire of all-steel wire without inner ring according to claim 1, characterized in that, The tire body steel cord area, the steel wire wrapping area, and the steel wire wrapping area are all formed with high points, which are the tire body steel cord area reverse wrapping high point, the steel wire wrapping area outside reverse wrapping high point, and the aramid cord area outside reverse wrapping high point, respectively.

3. The bead structure of a bus radial tire of all-steel wire without inner ring according to claim 2, characterized in that, The tire body steel cord area reverse wrapping high point, the steel wire wrapping area outside reverse wrapping high point, and the aramid cord area outside reverse wrapping high point are all formed with heights, which are the tire body steel cord area reverse wrapping height, the steel wire wrapping area outside reverse wrapping height, and the aramid cord area outside reverse wrapping height, respectively.

4. The bead structure of a bus radial tire of all-steel wire without inner ring according to claim 1, characterized in that, The aramid cord area outside reverse wrapping height > the steel wire wrapping area outside reverse wrapping height > the tire body steel cord area reverse wrapping height.

5. The bead structure of a bus radial tire of all-steel wire without inner ring according to claim 3, characterized in that, The sidewall rubber area, the wear-resistant rubber area, and the filling rubber area are combined to form a whole structure.

6. The bead structure of a bus radial tire of claim 5, wherein The steel wire wrapping area outside reverse wrapping height and the tire body steel cord area reverse wrapping height differ by 12-15 mm.

7. The bead structure of a bus radial tire of all-steel wire, without inner ring according to claim 6, characterized in that, The aramid cord area outside reverse wrapping height and the tire body steel cord area reverse wrapping height differ by 8-12 mm.

8. The bead structure of a bus radial tire of all-steel wire without inner ring according to claim 7, characterized in that, The bead area is arranged at an angle, and the bead area is composed of a bead wrapping cloth and a plurality of beads. The beads are arranged from bottom to top as 5-6-7-6.

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