Double-carcass radial tire structure

Abstract

The invention relates to the technical field of tire structures, in particular to a double-tire-body radial tire structure. Comprising a tire body, the tire body comprises a tire body, a rubber layer wrapping the outer surface of the tire body and a triangular supporting rubber structure located on the lower portion of the tire body, and a steel wire ring is embedded in the end of the triangular supporting rubber structure; the tire body is of a double-tire-body structure and comprises an inner tire body and an outer tire body located on the outer side of the inner tire body, the first end of the inner tire body reversely wraps the triangular supporting rubber structure from inside to outside and is attached to the outer side of the steel wire ring, and the second end of the outer tire body forwards wraps the first end of the inner tire body from outside to inside and is attached to the outer side of the steel wire ring. The outer walls and the inner walls of the upper portions of the inner tire body and the outer tire body are arranged in parallel in a stacked and attached mode. The technical problems that the mine short-distance, low-speed, over-tonnage and high-loading-capacity transportation environment requirements are met, and the loading capacity and the safety performance of an existing tire are insufficient are solved.

Description

Technical Field

[0001] The present application relates to the technical field of tire structures, and in particular to a dual-carcass radial tire structure. Background Art

[0002] With the continuous advancement of mining technology, the tonnage mined per unit time is increasing, and the output of minerals is also increasing, which requires faster and safer transportation methods for handling and storage.

[0003] However, in order to meet the demand for sufficient transportation volume, the existing mineral transport vehicles are manufactured to be larger and larger, and only the original transport vehicles are simply modified and upgraded to simply increase their transportation volume without considering the load capacity of the tires. The load is increased on the basis of the original load capacity of the tires, resulting in the continuous increase in tire pressure and the risk of tire blowout, which may lead to safety accidents. This unconventional high-load transportation requires upgrading the tires and using tires with better load capacity and safety performance to meet the needs of short-distance, low-speed, and ultra-tonnage high-load transportation in mines. Summary of the invention

[0004] The purpose of the present application is to provide a dual-carcass radial tire structure to solve the technical problem of insufficient load-bearing capacity and safety performance of existing tires in response to the short-distance, low-speed, ultra-tonnage and high-load transportation environment requirements of mines.

[0005] The present application provides a dual carcass radial tire structure, comprising: A tire body, the tire body comprising a carcass, a rubber layer wrapped around the outer surface of the carcass, and a triangular support rubber structure located at the lower part of the carcass, wherein a wire ring is embedded in the end of the triangular support rubber structure; In which, the carcass is arranged as a double carcass structure, including an inner carcass and an outer carcass located outside the inner carcass, the first end of the inner carcass reversely covers the triangular support rubber structure from the inside to the outside, and fits with the outside of the steel wire ring, the second end of the outer carcass positively covers the first end of the inner carcass from the outside to the inside, and the outer walls and inner walls at the upper positions of the inner carcass and the outer carcass are arranged in parallel, overlapped and fit together.

[0006] Furthermore, the dividing point between the upper part and the lower part of the carcass is the turning point where the inner carcass and the outer carcass begin to separate and turn inward and outward respectively; The triangular supporting rubber structure is located in a space enclosed by the lower part of the inner carcass and the lower part of the outer carcass and is in close contact with the inner carcass and the outer carcass.

[0007] Furthermore, the triangular support rubber structure includes an upper triangular rubber structure closely attached to the dividing point and a lower triangular rubber structure closely attached to the end of the carcass, and the upper triangular rubber structure and the lower triangular rubber structure are closely attached to each other, and the wire ring is embedded in the end of the lower triangular rubber structure; The rubber hardness of the lower triangular rubber structure is greater than the rubber hardness of the upper triangular rubber structure, and the elasticity of the upper triangular rubber structure is greater than the elasticity of the lower triangular rubber structure.

[0008] Furthermore, a cross-sectional height of a first endpoint of the first end portion of the inner carcass is higher than a cross-sectional height of a second endpoint of the second end portion of the outer carcass, and there is a height difference between the first endpoint and the second endpoint.

[0009] Furthermore, the distance that the first end point of the first end portion of the inner carcass exceeds the upper end point of the wire ring is 0.48 to 0.53 times the cross-sectional height of the triangular support rubber structure; and / or The distance that the second end point of the second end portion of the outer carcass exceeds the upper end point of the wire ring is 0.32 to 0.40 times the cross-sectional height of the triangular support rubber structure; and / or The difference in cross-sectional height between the first end point of the inner carcass and the second end point of the outer carcass is 15 to 25 mm; and / or The cross-sectional height of the triangular support rubber structure is 0.48 to 0.53 times the cross-sectional height of the entire tire body.

[0010] Furthermore, the tire body also includes a belt layer wound and tied between the carcass and the rubber layer, and the belt layer is located at the crown of the carcass; The belt layer includes a first belt, a second belt and a third belt stacked in sequence from the carcass to the rubber layer, and a fourth belt is added to the shoulder position of the carcass at opposite ends of the third belt, and the fourth belt is a 0 degree belt.

[0011] Furthermore, the opposite ends of the second belt are longer than the opposite ends of the first belt; The opposite ends of the second belt are respectively longer than the outer end of one of the fourth belts and the outer end of the other of the fourth belts.

[0012] Furthermore, the end of the second belt exceeds the end of the first belt and / or the outer end of the fourth belt by 10-15 mm; and / or The cross-sectional width of the fourth belt is 0.13 to 0.17 times the cross-sectional width of the entire crown.

[0013] Furthermore, the rubber layer on the outer side of the crown of the carcass includes tread rubber, base rubber and cushion rubber from the outside to the inside, and the cushion rubber fills the parts of the opposite ends of the second belt that exceed the first belt.

[0014] Furthermore, the rubber layer also includes an inner lining rubber layer attached and wrapped on the inner side of the carcass, and a sidewall rubber layer attached and wrapped on the two relatively outer sides of the carcass, the second end point of the second end portion of the outer carcass is covered in the inner lining rubber layer, and the rear end of the sidewall rubber layer is connected and attached to the rear end of the inner lining rubber layer.

[0015] Compared with the prior art, the dual-carcass radial tire structure provided in the present application has a tire body comprising a carcass, a rubber layer wrapped around the outer surface of the carcass, and a triangular support rubber structure located at the lower part of the carcass, with a steel wire ring embedded in the end of the triangular support rubber structure; the carcass is arranged as a dual-carcass structure, comprising an inner carcass and an outer carcass located outside the inner carcass. First, the first end of the inner carcass is reversely covered with the triangular supporting rubber structure from the inside to the outside and fits with the outside of the steel wire ring, and the second end of the outer carcass is positively covered with the first end of the inner carcass from the outside to the inside. Specifically, the triangular supporting rubber structure with a steel wire ring embedded in the end is covered with the first end of the inner carcass and fits it to the outside of the steel wire ring and is pressed tightly, and then the second end of the outer carcass is covered on the outside of the first end of the inner carcass, so that the second end of the outer carcass covers the first end point of the first end of the inner carcass bent outward and is pressed tightly, avoiding the outer end point (first end point) of the entire carcass being directly exposed to the outside of the carcass, but being tightly wrapped by the other carcass (outer carcass), and the ends of the double carcass sub-mouths are wrapped with each other, reducing the relative displacement caused by pressure deformation, reducing the occurrence of end point cracks, improving the sub-mouth bearing strength, and improving the tire load-bearing performance and safety performance.

[0016] Second, the upper position of the inner carcass and the outer carcass (including the side and crown), that is, the part of the carcass excluding the end position, has an outer wall and an inner wall that are parallel, overlapped and fitted together, so that the tire sidewall and the tire crown have two layers of carcasses that are parallel, overlapped and fitted together, which increases the rigidity and strength, makes the overall strength of the tire greater, and is not easy to be punctured, thereby improving the tire's load-bearing capacity and safety performance, and meeting the needs of short-distance, low-speed, ultra-tonnage and high-load transportation environments in mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The overall cross-sectional structure of the dual carcass radial tire structure provided in the embodiment of the present application is shown in FIG. Figure 1 ; Figure 2 The overall cross-sectional structure of the dual carcass radial tire structure provided in the embodiment of the present application is shown in FIG. Figure 2 ; Figure 3 A schematic diagram of a partial cross-sectional structure of a dual carcass radial tire structure provided in an embodiment of the present application Figure 1 ; Figure 4 A schematic diagram of a partial cross-sectional structure of a dual carcass radial tire structure provided in an embodiment of the present application Figure 2 .

[0019] Reference numerals: 10-carcass; 11-inner tube body; 111- a first end portion; 1111-first endpoint; 12- outer carcass; 121 - second end; 1211-second endpoint; 13-upper part; 14-lower part; 20-triangular support adhesive structure; 21-upper triangular rubber structure; 22-lower triangle rubber structure; 30-wire traveler; 40- rubber layer; 41-tread rubber; 42-base glue; 43-pad rubber; 44- lining rubber layer; 45-sidewall rubber layer; 50-belt layer; 51 - first belt; 52 - second belt; 53 - third belt; 54- fourth belt; 61- tire sidewall; 62-Tire crown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0027] The present application embodiment provides a dual carcass radial tire structure, such as Figures 1 to 4 The figure shows a cross-sectional schematic diagram of the dual-carcass radial tire structure, which includes a tire body, the tire body including a carcass 10, and a rubber layer 40 wrapped around the outer surface of the carcass 10, and a triangular support rubber structure 20 located at the lower part 14 of the carcass 10, wherein a steel wire ring 30 is embedded in the end of the triangular support rubber structure 20, and also includes a belt layer 50 wrapped and bundled between the carcass 10 and the rubber layer 40.

[0028] The carcass 10 is a double carcass structure, including an inner carcass 11 and an outer carcass 12 located outside the inner carcass 11. Figures 1 to 4 It can be seen from the cross-sectional structure diagram that in the cross-sectional direction, the first end 111 of the inner carcass 11 reversely covers the triangular supporting rubber structure 20 from the inside to the outside, and the first end 111 of the inner carcass 11 is simultaneously fitted with the outer side of the wire ring 30, and the second end 121 of the outer carcass 12 positively covers the first end 111 of the inner carcass 11 from the outside to the inside, and the outer walls and inner walls of the upper parts 13 of the inner carcass 11 and the outer carcass 12 are arranged in parallel, overlapped and fitted.

[0029] like Figure 3 As shown, the upper part 13 and the lower part 14 of the carcass 10 mentioned in the embodiment of the present application are divided up and down by the turning point position where the inner carcass 11 and the outer carcass 12 start to separate and turn inward and outward respectively as the dividing point a. The triangular support rubber structure 20 is located in the space surrounded by the lower part 14 of the inner carcass 11 and the lower part 14 of the outer carcass 12, and is closely attached to the inner carcass 11 and the outer carcass 12.

[0030] Compared with the prior art, the dual-carcass radial tire structure provided in the embodiment of the present application has a tire body comprising a carcass 10, a rubber layer 40 wrapped around the outer surface of the carcass 10, and a triangular support rubber structure 20 located at the lower part 14 of the carcass 10, a steel wire ring 30 being embedded in the end of the triangular support rubber structure 20; the carcass 10 is arranged as a dual carcass 10 structure, comprising an inner carcass 11 and an outer carcass 12 located outside the inner carcass 11.

[0031] First, the first end 111 of the inner carcass 11 reversely covers the triangular support rubber structure 20 from the inside to the outside and fits with the outside of the wire ring 30, and the second end 121 of the outer carcass 12 positively covers the first end 111 of the inner carcass 11 from the outside to the inside. Specifically, the triangular support rubber structure 20 with a wire ring 30 embedded in the end covers the first end 111 of the inner carcass 11 and fits it to the outside of the wire ring 30, and is pressed, and then the outer carcass 121 is covered on the outside of the first end 111 of the inner carcass 11. The second end portion 121 of the outer carcass 12 is made to cover the first end portion 1111 of the first end portion 111 of the inner carcass 11 bent outward and pressed tightly, thereby preventing the outer end portion (first end portion 1111) of the entire carcass from being directly exposed to the outside of the carcass 10, but being tightly wrapped by the other carcass (outer carcass 12), and the ends of the double carcass mouths are wrapped with each other, thereby reducing the relative displacement caused by the pressure deformation, reducing the occurrence of end point cracks, improving the mouth bearing strength, and improving the tire load-bearing performance and safety performance.

[0032] Second, the upper part 13 of the inner carcass 11 and the outer carcass 12 (including the side and crown), that is, the part of the carcass 10 excluding the end position, has its outer wall and inner wall arranged in parallel and overlapped with each other in the cross-sectional direction, so that the tire sidewall 61 and the tire crown 62 both have two layers of carcasses arranged in parallel and overlapped with each other, which increases the rigidity and strength, makes the overall strength of the tire greater, and is not easy to be punctured, thereby improving the tire's load-bearing capacity and safety performance, and meeting the needs of short-distance, low-speed, ultra-tonnage and high-load transportation environments in mines.

[0033] Regarding the aforementioned triangular support adhesive structure 20, as Figures 1 to 4 As shown, the triangular support rubber structure 20 includes an upper triangular rubber structure 21 that is in close contact with the dividing point a and a lower triangular rubber structure 22 that is in close contact with the end of the tire body 10, and the upper triangular rubber structure 21 and the lower triangular rubber structure 22 are in close contact with each other, and the wire ring 30 is embedded in the end of the lower triangular rubber structure 22. The lower triangular rubber structure 22 is mainly used for elastic support of the tire body 10, and mainly for its supporting function, so it is preferred that the rubber hardness of the lower triangular rubber structure 22 is greater than the rubber hardness of the upper triangular rubber structure 21, that is, the lower triangular rubber structure 22 is preferably made of a rubber material with a greater hardness, and the upper triangular rubber structure 21 is mainly used for anti-torque and buffering, so it is preferred that the upper triangular rubber structure 21 is made of a softer and more elastic rubber material, so it is preferred that the elasticity of the upper triangular rubber structure 21 is greater than the elasticity of the lower triangular rubber structure 22.

[0034] The aforementioned outer end point of the carcass (i.e., the first end point 1111) is wrapped by the outer carcass 12, while the inner end point of the carcass 10 (i.e., the second end point 1211) is subjected to far less pressure than the outer end point, so it does not need to be wrapped again, but only needs to be wrapped by the inner lining rubber layer 44 of the rubber layer 40.

[0035] Further, a preferred embodiment is as follows Figures 1 to 3 As shown, the cross-sectional height (i.e., distance d1) of the first endpoint 1111 of the first end 111 of the aforementioned inner carcass 11 is higher than the cross-sectional height (i.e., distance d2) of the second endpoint 1211 of the second end 121 of the outer carcass 12, so that there is a height difference between the first endpoint 1111 and the second endpoint 1211. Avoid generating a large concentrated stress at the same height position, reduce the stress caused by being at the same height position and forming a damage point due to excessive concentration; at the same time, the two carcasses are close to each other, which greatly increases the resistance of the two carcass layers to the twitching between the layers, effectively reduces the carcass twitching phenomenon caused by the sub-mouth, and improves the load-bearing performance and safety performance of the tire. Preferably, the cross-sectional height difference between the first endpoint 1111 of the inner carcass 11 and the second endpoint 1211 of the outer carcass 12 is 15~25mm. Specifically, Figure 2 As shown, the distance d1 of the first end point 1111 of the first end portion 111 of the inner carcass 11 beyond the upper end point of the wire ring 30 is preferably 0.48 to 0.53 times the cross-sectional height H0 of the triangular support rubber structure 20, so as to ensure the coating tightness and coating fit between the first end portion 111 of the inner carcass 11 and the triangular support rubber structure 20; the distance d2 of the second end portion 1211 of the outer carcass 12 beyond the upper end point of the wire ring 30 is preferably 0.32 to 0.40 times the cross-sectional height H0 of the triangular support rubber structure 20, so as to ensure the coating tightness and coating fit between the second end portion 121 of the outer carcass 12 and the triangular support rubber structure 20 and the first end portion 111; the cross-sectional height H0 of the triangular support rubber structure 20 is preferably 0.48 to 0.53 times the cross-sectional height H of the entire tire body, so as to ensure the elastic support, anti-torque and buffering effects of the triangular support rubber structure 20 on the entire carcass 10.

[0036] like Figure 1 As shown, the belt layer 50 is located at the crown of the upper part 13 of the carcass 10; the belt layer 50 includes a first belt 51, a second belt 52 and a third belt 53 which are sequentially stacked from the carcass 10 to the rubber layer 40, and a fourth belt 54 is added at the shoulder of the carcass 10 on the opposite ends of the third belt 53, and the fourth belt 54 is a 0-degree belt. Preferably, the cross-sectional width of the fourth belt 54 is 0.13 to 0.17 times the cross-sectional width of the entire crown, so as to facilitate the tightening of the shoulder.

[0037] With such arrangement, the belt layer 50 adopts 3 layers of belts, and the shoulders are further tightened with 2 layers of 0-degree belts, which can reduce tire deformation and prevent the shoulder of the belt from sliding. The excessively deformed part of the tire can be tightened to reduce relative displacement, reduce heat generation, and reduce tire explosion and shoulder empty ratio. At the same time, the tread adopts 0-degree belt shoulder tightening and double carcass structure to enhance the overall performance of the tread, making it less prone to serious deformation, effectively increasing the tread safety factor, and improving the overall tire safety performance.

[0038] Furthermore, the relative ends of the aforementioned second belt 52 are longer than the relative ends of the first belt 51, and preferably, both ends exceed by 10~15mm; furthermore, it is preferred that the relative ends of the second belt 52 are respectively longer than one outer end of the fourth belt 54 and the other outer end of the fourth belt 54, and the excess length is preferably 10~15mm, and the second belt 52 is the longest.

[0039] Regarding the aforementioned rubber layer 40, as Figure 1 As shown, the rubber layer 40 on the outer side of the crown of the upper part 13 of the carcass 10 may include tread rubber 41, base rubber 42 and cushion rubber 43 from the outside to the inside, and the cushion rubber 43 fills the portions of the opposite ends of the second belt 52 that exceed the first belt 51, thereby preventing the portion below the end point of the second belt 52 from hanging down due to lack of rubber.

[0040] Furthermore, the rubber layer 40 may also include an inner lining rubber layer 44 attached and wrapped on the inner side of the carcass 10, and a sidewall rubber layer 45 attached and wrapped on the two relatively outer sides of the carcass 10, the second end point 1211 of the second end portion 121 of the outer carcass 12 is covered in the inner lining rubber layer 44, and the rear end of the sidewall rubber layer 45 is connected and fitted with the rear end of the inner lining rubber layer 44.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual carcass radial tire structure, characterized in that: include: A tire body, the tire body comprising a carcass, a rubber layer wrapped around the outer surface of the carcass, and a triangular support rubber structure located at the lower part of the carcass, wherein a wire ring is embedded in the end of the triangular support rubber structure; In which, the carcass is arranged as a double carcass structure, including an inner carcass and an outer carcass located outside the inner carcass, the first end of the inner carcass reversely covers the triangular support rubber structure from the inside to the outside, and fits with the outside of the steel wire ring, the second end of the outer carcass positively covers the first end of the inner carcass from the outside to the inside, and the outer walls and inner walls at the upper positions of the inner carcass and the outer carcass are arranged in parallel, overlapped and fit together.

2. The dual carcass radial tire structure according to claim 1, characterized in that: The dividing point between the upper and lower parts of the carcass is the turning point where the inner carcass and the outer carcass begin to separate and turn inward and outward respectively; The triangular supporting rubber structure is located in a space enclosed by the lower part of the inner carcass and the lower part of the outer carcass and is in close contact with the inner carcass and the outer carcass.

3. The dual carcass radial tire structure according to claim 2, characterized in that: The triangular support rubber structure includes an upper triangular rubber structure closely attached to the dividing point and a lower triangular rubber structure closely attached to the end of the carcass, and the upper triangular rubber structure and the lower triangular rubber structure are closely attached to each other, and the wire ring is embedded in the end of the lower triangular rubber structure; The rubber hardness of the lower triangular rubber structure is greater than the rubber hardness of the upper triangular rubber structure, and the elasticity of the upper triangular rubber structure is greater than the elasticity of the lower triangular rubber structure.

4. The dual carcass radial tire structure according to claim 2, characterized in that: The cross-sectional height of a first end point of the first end portion of the inner carcass is higher than the cross-sectional height of a second end point of the second end portion of the outer carcass, and there is a height difference between the first end point and the second end point.

5. The dual carcass radial tire structure according to claim 4, characterized in that: The distance that the first end point of the first end portion of the inner carcass exceeds the upper end point of the wire ring is 0.48 to 0.53 times the cross-sectional height of the triangular support rubber structure; and / or The distance that the second end point of the second end portion of the outer carcass exceeds the upper end point of the wire ring is 0.32 to 0.40 times the cross-sectional height of the triangular support rubber structure; and / or The difference in cross-sectional height between the first end point of the inner carcass and the second end point of the outer carcass is 15 to 25 mm; and / or The cross-sectional height of the triangular support rubber structure is 0.48 to 0.53 times the cross-sectional height of the entire tire body.

6. The dual carcass radial tire structure according to any one of claims 1 to 5, characterized in that: The tire body further comprises a belt layer wound and tied between the carcass and the rubber layer, wherein the belt layer is located at the crown of the carcass; The belt layer includes a first belt, a second belt and a third belt stacked in sequence from the carcass to the rubber layer, and a fourth belt is added to the shoulder position of the carcass at opposite ends of the third belt, and the fourth belt is a 0 degree belt.

7. The dual carcass radial tire structure according to claim 6, characterized in that: The opposite ends of the second belt are longer than the opposite ends of the first belt; The opposite ends of the second belt are respectively longer than the outer end of one of the fourth belts and the outer end of the other of the fourth belts.

8. The dual carcass radial tire structure according to claim 7, characterized in that: The end of the second belt exceeds the end of the first belt and / or the outer end of the fourth belt by 10-15 mm; and / or The cross-sectional width of the fourth belt is 0.13 to 0.17 times the cross-sectional width of the entire crown.

9. The dual carcass radial tire structure according to claim 7 or 8, characterized in that: The rubber layer on the outer side of the crown of the carcass includes tread rubber, base rubber and cushion rubber from outside to inside, and the cushion rubber fills the parts of the opposite ends of the second belt that exceed the first belt.

10. The dual carcass radial tire structure according to claim 9, characterized in that: The rubber layer also includes an inner lining rubber layer attached and wrapped on the inner side of the carcass, and a sidewall rubber layer attached and wrapped on the two relatively outer sides of the carcass. The second end point of the second end portion of the outer carcass is covered in the inner lining rubber layer, and the rear end of the sidewall rubber layer is connected and attached to the rear end of the inner lining rubber layer.

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