Novel tire and production process thereof

Abstract

A novel tyre includes a carcass, a breaker (9), a belt (10), a sidewall (4) and a tread (11). The carcass comprises an inner cord ply (1) and an outer cord ply (3), both of which are made of steel cord. A rubber insulation (2) is provided between the inner and outer cord plies (1, 3) and located at the two sides of the carcass and at the middle part thereof. The rubber insulation (2) has a thickness of 0.8-1.5 mm, the thickness of the ends of whose two sides smoothly changes to 0 mm. The cords of the inner cord ply (1) and the outer cord ply (3) are arranged in intersection with each other. The tyre is characterized in that the two layers of cords are wear-resistant and the carcass is good in stability. The production process for the novel tyre is as follows: first preparing a cord ply manufacturing drum (15) corresponding to the tyre to be produced, then forming a cylindrical cord ply by winding the cords and tyre fabric around the manufacturing drum, and finally cutting along a spiral cutting line at an inclination angle. Since the cords are spirally wound, the cords are substantially in the circumferential direction of the cylindrical cord ply. Namely, the cords are substantially parallel to the two sides of a plate-shaped cord ply after unwrapped.

Description

technical field [0001] The invention relates to a tire, in particular to an automobile tire and its production process. Background technique [0002] The main structural features of existing radial tires have the following points: [0003] 1. The layers of the carcass cord are arranged in the meridian direction from one bead to the other. The stress generated by the internal pressure of the tire on the carcass cord is half less than that of ordinary bias tires, and all the cords are arranged in the direction of the force, and each cord is fully stressed; [0004] 2. The belt layer of the radial tire is the main stress-bearing part, which bears 60-75% of the total tensile force of the tire internal pressure; [0005] 3. Due to the radial arrangement of the carcass cords, the strength of the cords can be maximized, but the side of the carcass is soft and not rigid enough due to the small number of layers, and the normal deformation is 25-30% larger than that of bias tires. ...

AI Technical Summary

Problems solved by technology

[0005] 3. Due to the meridional arrangement of the carcass cords, the strength of the cords can be maximized, but the side of the carcass is soft and not rigid enough due to the small number of layers, and the normal deformation is 25-30% larger than that of bias tires. Large deformation, easy to pierce

The above-mentioned zero-degree angle belt layer is stable in the circumferential direction of the tire, and will not expand or contract even during the high-pressure vulcanization process. Among them, the stress on the two shoulders is relatively concentrated and the wear is relatively large, and the colloid on both sides of the belt layer is prone to cracking and the cords are exposed.

In bias ply tires, during the vulcanization process, the belt layer will be stretched in the middle, and its cross section will produce an arc shape, that is, the structure of the middle bulge, so that the colloid on both sides of the belt layer is not easy to crack, but in zero-degree belt layer tires Among them, due to the high rigidity of the belt layer, its various parts will hardly stretch during the vulcanization process. Therefore, in the prior art, there is no precedent for solving this problem.

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