A belt structure of a small engineering tire

Abstract

The present invention belongs to the technical field of small engineering tire production and manufacturing, and specifically relates to a small engineering tire belt structure. The belt structure of the present invention includes, from bottom to top, a first belt layer, a first filling layer, a second belt layer, a second filling layer, a third belt layer, and a fourth belt layer that are tightly attached together, and also includes a zero-degree belt layer, wherein the first filling layer is applied between the first belt layer and the second belt layer, the second filling layer is applied between the second belt layer and the third belt layer, and the zero-degree belt layer is arranged at the ends of the third belt layer and the fourth belt layer. The belt structure of the present invention can reduce the shear stress between the belt layers during the use of the tire, and the restraint of the shoulder zero-degree belt layer reduces the deformation of the belt layer end, reduces the tire shoulder space, and increases the tire service life.

Description

Technical Field

[0001] The invention belongs to the technical field of production and manufacturing of small engineering tires, and relates to a belt layer structure of a small engineering tire. Background Art

[0002] Although many mines have been closed due to environmental remediation, there are still quite a few heavy metal mining areas in operation to meet the material needs of various industries in the country. Among them, some of the tires used by transport vehicles are 13.00R25 and 14.00R25 tires, which we call small engineering tires. There have always been industry barriers to targeted high-performance tire manufacturing, while traditional tires lack innovation, are homogenized and low-end, and often cannot adapt to the harsh conditions in mining areas. Small engineering tires have many shoulder and crown problems due to their long continuous use time and high load. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a belt structure for a small engineering tire in view of the above-mentioned deficiencies of the prior art. The belt structure of the present invention can reduce the shear stress between the belt layers during the use of the tire, and the restraint of the shoulder zero-degree belt layer reduces the deformation of the belt layer end, reduces the tire shoulder space, and increases the tire service life.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a belt structure of a small engineering tire, characterized in that the belt structure has the following characteristics:

[0005] A belt layer structure of a small engineering tire includes, from bottom to top, a first belt layer, a first filling layer, a second belt layer, a second filling layer, a third belt layer, and a fourth belt layer that are tightly attached to each other, and also includes a zero-degree belt layer. The first filling layer is applied between the first belt layer and the second belt layer, the second filling layer is applied between the second belt layer and the third belt layer, and the zero-degree belt layer is arranged at the ends of the third belt layer and the fourth belt layer.

[0006] The zero-degree belt layer is formed by winding a single steel wire on a forming machine, and the spacing between adjacent steel wires is 0.4-0.8 mm.

[0007] The first belt layer, the second belt layer, the third belt layer and the fourth belt layer are all formed by calendering steel cords coated with rubber.

[0008] The inclination angle of the steel cords of the first belt layer is 20°-25°, and the inclination angle of the steel cords of the second belt layer is 15°-20°, and the steel cords of the two belt layers are crossed.

[0009] The endpoints of the first filling layer and the second filling layer are both located outside the endpoint of the second belt layer, with a difference of 15-20 mm.

[0010] The first filling layer is thin in the middle and thick at both ends, with the thickest part being 2-4 mm, and the rubber material is the same as that of the belt layer.

[0011] The thickness of the second filling layer is 2-3 mm, and it is cut from nylon rubber cord fabric, the nylon warp of the nylon rubber cord fabric forms an angle of 50°-60° with the center line, and the rubber material is the same as that of the belt layer.

[0012] The inclination angle of the steel cords of the third belt layer is 15° to 20°, and the third belt layer crosses the second belt layer.

[0013] The widths of the fourth belt layer and the inclination angles of the steel cords are the same as those of the third belt layer, and the steel cords of the two belt layers are crossed.

[0014] The zero-degree belt layer is wound in two layers, and its edge is separated from the third belt layer and the fourth belt layer by 1-2 mm.

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

[0016] The present invention adds a filling layer between the first belt layer, the second belt layer and the third belt layer, which reduces the shear stress between the steel wires and enhances the strength of the crown. This belt layer structure can reduce the shear stress between the belt layers during the use of the tire. The shoulder zero-degree belt layer is formed by winding a single steel wire on a forming machine, and a certain distance is set between the steel wires. The wound zero-degree belt layer has no joints, and there is no steel wire concentrated stress area, which improves the tightening effect of the zero-degree belt layer on the shoulder, reduces the deformation of the belt layer end, reduces the tire shoulder space, and improves the tire service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the belt layer in the prior art.

[0018] Figure 2 It is a schematic diagram of the structure of the belt layer of a small engineering tire of the present invention.

[0019] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the AA section of the belt layer.

[0020] Explanation of reference numerals: 1 - first belt layer; 2 - first filling layer; 3 - second belt layer; 4 - second filling layer; 5 - zero-degree belt layer; 6 - third belt layer; 7 - fourth belt layer; 8 - tread.

[0021] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0022] like Figure 2As shown, a small engineering tire belt layer structure includes, from bottom to top, a first belt layer 1, a first filling layer 2, a second belt layer 3, a second filling layer 4, a third belt layer 6, and a fourth belt layer 7 that are tightly attached to each other. The fourth belt layer 7 is close to the tread 8, and also includes a zero-degree belt layer 5. The first filling layer 2 is applied between the first belt layer 1 and the second belt layer 3, the second filling layer 4 is applied between the second belt layer 3 and the third belt layer 6, and the zero-degree belt layer 5 is arranged at the ends of the third belt layer 6 and the fourth belt layer 7. The air is rolled out between the layers by a rolling device.

[0023] The zero-degree belt layer 5 is formed by winding a single steel wire on a forming machine, and the spacing between adjacent steel wires is 0.6 mm. The wound zero-degree belt layer has no joints, and there is no area where the steel wire concentrates stress, thereby improving the tightening effect of the zero-degree belt layer on the tire shoulder.

[0024] The first belt layer 1, the second belt layer 3, the third belt layer 6 and the fourth belt layer 7 are all formed by calendering steel cords coated with rubber.

[0025] The inclination angle of the steel cords of the first belt layer 1 is 24°, and the inclination angle of the steel cords of the second belt layer 3 is 18°, and the steel cords of the two belt layers are crossed.

[0026] The endpoints of the first filling layer 2 and the second filling layer 4 are both located outside the endpoint of the second belt layer 3, with a difference of 17 mm.

[0027] The first filling layer 2 is thin in the middle and thick at both ends, with the thickest part being 3 mm, and the rubber material is the same as that of the belt layer.

[0028] The second filling layer 4 has a thickness of 2 mm and is cut from nylon rubber cord fabric. The nylon warp of the nylon rubber cord fabric forms an angle of 50° with the center line, and the rubber material is the same as that of the belt layer.

[0029] The steel cords of the third belt layer 6 have an inclination angle of 18° and cross the second belt layer 3 .

[0030] The widths of the fourth belt layer 7 and the inclination angles of the steel cords are the same as those of the third belt layer 6, and the steel cords of the two belt layers are crossed.

[0031] The zero-degree belt layer 5 is wound in two layers, and its edge portions are spaced 1 mm apart from the third belt layer 6 and the fourth belt layer 7 .

[0032] The product of the present invention is designed with targeted improvements to the defects of existing products. This belt layer structure can reduce the shear stress between belt layers during tire use. The constraint of the shoulder zero-degree belt layer reduces the deformation of the belt layer end, reduces the tire shoulder space, and increases the tire service life.

[0033] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A belt structure of a small engineering tire, comprising, from bottom to top, a first belt layer (1), a first filling layer (2), a second belt layer (3), a second filling layer (4), a third belt layer (6), and a fourth belt layer (7) which are closely attached to each other, characterized in that: It also includes a zero-degree belt layer (5), wherein the first filling layer (2) is applied between the first belt layer (1) and the second belt layer (3), the second filling layer (4) is applied between the second belt layer (3) and the third belt layer (6), and the zero-degree belt layer (5) is arranged at the ends of the third belt layer (6) and the fourth belt layer (7); The endpoints of the first filling layer (2) and the second filling layer (4) are both located outside the endpoint of the second belt layer (3), with a difference of 15 to 20 mm; The first filling layer (2) is thin in the middle and thick at both ends, with the thickest part being 2-4 mm, and the rubber material is the same as that of the belt layer; The inclination angle of the steel cords of the first belt layer (1) is 20° to 25°, and the inclination angle of the steel cords of the second belt layer (3) is 15° to 20°, and the steel cords of the two belt layers are crossed; The second filling layer (4) has a thickness of 2-3 mm and is cut from nylon rubber cord fabric, the nylon warp of the nylon rubber cord fabric forms an angle of 50°-60° with the center line, and the rubber material is the same as that of the belt layer; The steel cords of the third belt layer (6) have an inclination angle of 15° to 20° and cross the second belt layer (3); The widths of the fourth belt layer (7) and the inclination angles of the steel cords are the same as those of the third belt layer (6), and the steel cords of the two belt layers are crossed.

2. The belt structure of a small engineering tire according to claim 1, characterized in that: The zero-degree belt layer (5) is formed by winding a single steel wire on a forming machine, and the spacing between adjacent steel wires is 0.4-0.8 mm.

3. The belt structure of a small engineering tire according to claim 1, characterized in that: The first belt layer (1), the second belt layer (3), the third belt layer (6) and the fourth belt layer (7) are all formed by calendering steel cords coated with rubber.

4. The belt structure of a small engineering tire according to claim 1, characterized in that: The zero-degree belt layer (5) is wound in two layers, and its edge is separated from the third belt layer (6) and the fourth belt layer (7) by 1 to 2 mm.

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