Pneumatic tire with improved durability

Abstract

The invention provides a pneumatic tire with improved durability. A tire body of the pneumatic tire comprises a first tire body ply and a second tire body ply, wherein the first tire body ply reversely wraps around a bead core and bead filler from the inner side of an axial direction of the tire to the outer side of the axial direction of the tire, the second tire body ply forwardly wraps along the bead core and bead filler in a manner of downwards extending from the outer side of the axial direction of the tire, the height of a reverse wrapping endpoint of the first tire body ply is (0.45 to0.55)SH, a forward wrapping endpoint of the second tire body ply is located at a position, which is away from a bead toe position by 3mm, and SH means tire section height; a reinforcing rubber sheet which extends along the radial direction of the tire is arranged between the second tire body ply and tire bead protecting rubber, the vertical height from the lower endpoint of the reinforcing rubbersheet to the bead toe is 5mm to 11mm, and the width of the reinforcing rubber sheet along the radial direction of the tire is 42mm to 48mm. According to the pneumatic tire with improved durability, through the double tire body plies and the tire bead structure with the composite reinforcing rubber sheet, the durability of the tire can be improved.

Description

technical field [0001] The invention relates to the technical field of tires, in particular to a pneumatic tire for improving durability. Background technique [0002] In order to improve the durability of radial truck tires and cope with the harsh and complex market conditions, it is not uncommon for mainstream brands of radial truck tires to use double-layer positive wrap structures. Some high-load truck tires also use sidewall reinforcement layers. The method is to improve the load-bearing capacity and durability of the tire. The material of the reinforcing layer is mostly nylon cord, and film is also used in some cases. However, according to market feedback, the existing design still has problems of insufficient durability and instability. [0003] The structure of the double-layer front bag and reinforcing layer of general truck radial tires has the following disadvantages [0004] 1. The material, size control and process of the reinforcement layer are very important....

AI Technical Summary

Problems solved by technology

[0004] 1. The material, size control and process of the reinforcement layer are very important. Although the commonly used nylon reinforcement layer provides sufficient strength, its adhesion is insufficient. Some products also use a film reinforcement layer, but the width and thickness of the film are controlled Poor, or the process cannot make it fit well with the carcass cord, which will also cause the tire to generate heat prematurely during use, resulting in unstable or reduced durability;

[0005] 2. The rim of the tire is the concentration area of ​​the endpoints. Now many products will transfer the problem of endpoint concentration caused by these components at the rim by increasing the height of the apex, the heightening of the rim protective rubber or the heightening of the reinforcement layer, and the cost will be corresponding Also increased, in addition, because most of the nylon cord slit anti-scratch cloth used will extend between the two layers of carcass cords, the adhesion performance is not as good as that of the film. If the film is used instead, the conventional height design will also Still can't avoid the generation of endpoints around the rim line

Images