A bead portion for improving the load-bearing performance of a tubeless tire

Abstract

The present invention proposes a bead portion for improving the load-bearing performance of a tubeless tire, comprising a bead, a filling rubber, an turned-up carcass, a transition rubber sheet group, a nylon cloth group, a bead rubber cover, a bead wear-resistant rubber, and a sidewall rubber. The bead is arranged inside the turned-up carcass, and the filling rubber is arranged above the bead between the carcass and the turned-up carcass. The bead rubber cover is wrapped around the bead joint between the filling rubber and the turned-up carcass, the bead wear-resistant rubber wraps around the lower part of the bead rubber cover, and the sidewall rubber wraps along the outer sides of the bead rubber cover and the bead wear-resistant rubber. The transition rubber sheet group is attached between the filling rubber and the turned-up carcass, and the nylon cloth group is attached between the transition rubber sheet group and the bead rubber cover and the bead wear-resistant rubber. In this scheme, the steel wire reinforcement layer at the bead position is cancelled and replaced by a nylon cloth layer, so as to reduce the rigidity of the bead position, reduce the stress and strain at the end point of the steel wire, and increase the effective bending area of ​​the tire.

Description

Technical Field

[0001] The invention relates to the technical field of tire preparation, and in particular to a tire bead portion for improving the load-bearing performance of a tubeless tire. Background Art

[0002] my country's road transport environment is complex, with serious overloading in some areas. The vehicles used in overloaded areas are generally heavy-duty vehicles. The tires used by heavy-duty vehicles are tube-type tires with reinforced tire bead areas and good load-bearing performance. In recent years, with the changes in my country's road transport environment, the types of vehicles used for transport have also been constantly changing, and the tires used have gradually changed from tube-type tires to tubeless tires. However, the bead area structure of ordinary tubeless tires usually adopts a layer of steel wire cloth structure. Under heavy-load use, the tire sinkage rate is large, the stress in the bead area is easily concentrated, and the tire load-bearing performance is poor, resulting in early damage to the bead area, which cannot meet the use requirements of large-tonnage heavy-duty vehicles. Figure 3 . Summary of the invention

[0003] It is necessary to provide a bead portion that improves the load-bearing performance of a tubeless tire.

[0004] A tire bead portion for improving the load-bearing performance of a tubeless tire comprises a tire bead, a filling rubber, an turned-up carcass, a transition rubber sheet group, a nylon wrapping cloth group, a sprocket rubber sheet, a sprocket wear-resistant rubber sheet and a sidewall rubber sheet. The tire bead is arranged inside the turned-up carcass, the filling rubber is arranged above the tire bead between the carcass and the turned-up carcass, the sprocket rubber sheet is wrapped around the sprocket joint between the filling rubber and the turned-up carcass, the sprocket wear-resistant rubber sheet wraps around the lower part of the sprocket rubber sheet, the sidewall rubber wraps along the outer sides of the sprocket rubber sheet and the sprocket wear-resistant rubber sheet, the transition rubber sheet group is attached between the filling rubber and the turned-up carcass, and the nylon wrapping cloth group is attached between the transition rubber sheet group and the sprocket rubber sheet and the sprocket wear-resistant rubber sheet.

[0005] Preferably, the nylon wrapping group includes a first nylon wrapping layer, a second nylon wrapping layer, and a third nylon wrapping layer. The length of the third nylon wrapping layer is less than that of the first nylon wrapping layer and the second nylon wrapping layer. The third nylon wrapping layer is attached to the outer side of the first film of the transition film group, and the third nylon wrapping layer is attached to the junction of the turned-up carcass and the filling rubber to transfer or resist the stress of the end of the turned-up carcass. The second nylon wrapping layer covers the outer side of the third nylon wrapping layer. The side edge of the upper end of the nylon covering layer is higher than the side edge of the upper end of the third nylon covering layer, and lower than the height of the side edge of the upper end of the first film. The side edge of the lower end of the second nylon covering layer is lower than the side edge of the lower end of the first film of the transition film group, so as to fit with the outer side of the turned-up carcass. The first nylon covering layer covers the outer side of the second nylon covering layer. The side edge of the upper end of the first nylon covering layer is higher than the side edge of the upper end of the third nylon covering layer, and the side edge of the lower end of the first nylon covering layer is higher than the side edge of the lower end of the second nylon covering layer.

[0006] Preferably, the transition film group includes a first film and a second film, and the side edges of the second film are respectively adhered to the turned-up carcass and the filling rubber, so that the junction of the carcass and the filling rubber is covered by the first film and the outside of the second film is covered, so as to cover the joint between the first film and the filling rubber, and to cover the joint between the first film and the turned-up carcass.

[0007] In the present invention, the steel wire reinforcement layer at the tire bead is eliminated, thereby reducing the rigidity of the tire bead, reducing the stress and strain at the end points of the steel wire, and increasing the effective flexure area of ​​the tire.

[0008] After removing the steel wire cloth reinforcement layer that is prone to cause stress concentration, in order to increase the load-bearing performance of the tire bead area, three layers of nylon cloth are used to reinforce the tire bead area. The difference between the three layers of nylon cloth is 10-15mm for A and B, and the cutting angle of the nylon cloth is 40-45°. The laying direction of the first nylon cloth layer and the third nylon cloth layer is in the same direction, and the laying direction of the second nylon cloth layer is opposite to the laying direction of the first nylon cloth layer and the third nylon cloth layer.

[0009] In order to reduce the stress and strain of the nylon wrap and the carcass steel wire, two layers of isolation film are added between the three layers of nylon wrap and the reversed carcass steel wire. The difference between the two layers of film is kept at a+b of 5-10mm, and the edge of the film and the edge of the nylon wrap are kept flush. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the tire bead portion of the present invention.

[0011] Figure 2 It is a schematic diagram of the development of the tire bead portion of the present invention.

[0012] Figure 3 It is a schematic diagram of a tire bead portion of the prior art.

[0013] In the figure: tire bead 11, filling rubber 12, turned-up tire body 13, transition rubber sheet group 14, first rubber sheet 141, second rubber sheet 142, nylon covering cloth group 15, first nylon covering cloth layer 151, second nylon covering cloth layer 152, third nylon covering cloth layer 153, sub-mouth rubber 16, sub-mouth wear-resistant rubber 17, sidewall rubber 18. DETAILED DESCRIPTION

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] See also Figure 1 , 2The embodiment of the present invention provides a bead portion for improving the load-bearing performance of a tubeless tire, comprising a bead 11, a filling rubber 12, an turned-up carcass 13, a transition rubber sheet group 14, a nylon wrapping cloth group 15, a sub-mouth rubber sheet 16, a sub-mouth wear-resistant rubber sheet 17, and a sidewall rubber sheet 18. The bead 11 is arranged inside the turned-up carcass 13, and the filling rubber 12 is arranged above the bead 11 between the carcass and the turned-up carcass 13. The sub-mouth rubber sheet 16 is wrapped around the sub-mouth joint between the filling rubber 12 and the turned-up carcass 13, and the sub-mouth wear-resistant rubber sheet 17 is wrapped around the lower part of the sub-mouth rubber sheet 16. The sidewall rubber sheet 18 is wrapped along the outer sides of the sub-mouth rubber sheet 16 and the sub-mouth wear-resistant rubber sheet 17. The transition rubber sheet group 14 is attached between the filling rubber 12 and the turned-up carcass 13, and the nylon wrapping cloth group 15 is attached between the transition rubber sheet group 14 and the sub-mouth rubber sheet 16 and the sub-mouth wear-resistant rubber sheet 17.

[0016] In the existing reinforcement scheme for the bead 11 of tubeless tires, a layer of steel wire cloth is usually added to the bead 11, or a layer of steel wire cloth is added to the bead 11, and one or two layers of nylon cloth are added to reinforce the bead 11. The bead 11 of the tire with steel wire reinforcement or steel wire reinforcement layer plus nylon reinforcement layer has high rigidity and a smaller flexure area of ​​the tire as a whole. When the tire is used in a heavy-duty vehicle, the stress on the steel wire reinforced and nylon reinforced bead 11 is large due to the large amount of tire itself sinking, and the stress is easily concentrated on the end point of the steel wire reinforcement layer, thereby causing the tire bead 11 to be damaged and unable to be used normally.

[0017] In this solution, the wire cloth layer is removed, thereby avoiding the problem of stress concentration at the end points caused by the high hardness and poor toughness of the steel wire.

[0018] Furthermore, the nylon wrapping group 15 includes a first nylon wrapping layer 151, a second nylon wrapping layer 152, and a third nylon wrapping layer 153. The length of the third nylon wrapping layer 153 is less than that of the first nylon wrapping layer 151 and the second nylon wrapping layer 152. The third nylon wrapping layer 153 is attached to the outer side of the first film 141 of the transition film group 14, and the third nylon wrapping layer 153 is attached to the junction of the turned-up carcass 13 and the filling rubber 12 to transfer or resist the stress at the end of the turned-up carcass 13. The second nylon wrapping layer 152 covers the outer side of the third nylon wrapping layer 153. The side edge of the upper end of the second nylon covering layer 152 is higher than the side edge of the upper end of the third nylon covering layer 153, and lower than the height of the side edge of the upper end of the first film 141. The side edge of the lower end of the second nylon covering layer 152 is lower than the side edge of the lower end of the first film 141 of the transition film set 14, so as to fit with the outer side of the turned-up carcass 13. The first nylon covering layer 151 covers the outer side of the second nylon covering layer 152. The side edge of the upper end of the first nylon covering layer 151 is higher than the side edge of the upper end of the third nylon covering layer 153, and the side edge of the lower end of the first nylon covering layer 151 is higher than the side edge of the lower end of the second nylon covering layer 152.

[0019] Furthermore, the transition film group 14 includes a first film 141 and a second film 142. The side edges of the second film 142 are respectively bonded to the turned-up carcass 13 and the filling rubber 12, so that the joint of the carcass and the filling rubber 12 is covered by the first film 141 and the outer side of the second film 142, so that the joint between the first film 141 and the filling rubber 12 is covered, and the joint between the first film 141 and the turned-up carcass 13 is covered, forming a stepped transition type bonding, so that the turned-up carcass 13 and the nylon wrapping cloth group 15 are transitionally connected by the transition film, so that the transition film forms a buffer transition connection between the turned-up carcass 13 and the nylon wrapping cloth group 15, thereby avoiding stress concentration at the end of the turned-up carcass 13.

[0020] In this solution, the upper ends of the three nylon covering layers form a step-wise decreasing fitting structure from outside to inside, so that the nylon covering layer close to the end of the turned-up carcass 13 is the last one, thereby increasing the strength here.

[0021] Since the strength of the nylon covering layer is very high, it only plays the role of ensuring the strength of the joint of the sub-mouth, and the film group plays the role of buffering connection, increasing the tightness of the connection between the carcass and the nylon covering layer.

[0022] The modules or units in the device of the embodiment of the present invention may be combined, divided or deleted according to actual needs.

[0023] What is disclosed above is only the preferred embodiment of this patent document, and of course it cannot be used to limit the scope of rights of the present invention. Moreover, the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. A person of ordinary skill in the art can understand that the implementation of all or part of the processes of the above-mentioned embodiments and the equivalent changes made in accordance with the claims of the present invention still fall within the scope covered by the invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0024] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A bead portion for improving the load-bearing performance of a tubeless tire, characterized in that: The tire comprises a tire bead, a filling rubber, an inverted tire body, a transition rubber sheet group, a nylon wrapping cloth group, a bead rubber sheet, a bead wear-resistant rubber sheet and a sidewall rubber sheet. The tire bead is arranged inside the inverted tire body, a filling rubber sheet is arranged above the tire bead between the tire body and the inverted tire body, the bead rubber sheet is wrapped around the bead joint between the filling rubber sheet and the inverted tire body, the bead wear-resistant rubber sheet is wrapped around the lower part of the bead rubber sheet, the sidewall rubber sheet is wrapped along the outer side of the bead rubber sheet and the bead wear-resistant rubber sheet, and the transition rubber sheet group is attached to the filling rubber sheet and the inverted tire body. The nylon wrapping group is attached between the transition film group and the sub-mouth rubber and the sub-mouth wear-resistant rubber; the nylon wrapping group includes a first nylon wrapping layer, a second nylon wrapping layer, and a third nylon wrapping layer. The length of the third nylon wrapping layer is less than that of the first nylon wrapping layer and the second nylon wrapping layer. The third nylon wrapping layer is attached to the outer side of the first film of the transition film group, and the third nylon wrapping layer is attached to the junction of the reversed carcass and the filling rubber to transfer or resist To resist the stress of the end of the turned-up carcass, the second nylon covering layer covers the outer side of the third nylon covering layer, the side edge of the upper end of the second nylon covering layer is higher than the side edge of the upper end of the third nylon covering layer, and is lower than the height of the side edge of the upper end of the first film, the side edge of the lower end of the second nylon covering layer is lower than the side edge of the lower end of the first film of the transition film group, so as to fit with the outer side of the turned-up carcass, the first nylon covering layer covers the outer side of the second nylon covering layer, the side edge of the upper end of the first nylon covering layer is higher than the side edge of the upper end of the third nylon covering layer, and the side edge of the lower end of the first nylon covering layer is higher than the side edge of the lower end of the second nylon covering layer; the transition film group includes a first film and a second film, the side edges of the second film are respectively fitted with the turned-up carcass and the filling rubber to cover the joint of the turned-up carcass and the filling rubber, and the first film covers the outer side of the second film to cover the joint between the first film and the filling rubber, and the joint between the first film and the turned-up carcass.

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