Heavy-load radial tire and manufacturing method thereof

Abstract

The invention provides a heavy-load radial tire and a manufacturing method, and relates to the field of radial tires, the heavy-load radial tire comprises a tread, a sidewall and a tire body, the sidewall is connected with the tread and toe wear-resistant rubber, and the toe wear-resistant rubber is connected with a lining after bypassing a steel wire ring; a belted layer outer reinforcing layer, a belted layer and a belted layer inner reinforcing layer are sequentially arranged between the tread and the tire body; one end of the belted layer inner reinforcing layer is in lap joint with the belted layer, and the other end extends to the sidewall; the belted layer is covered with the belted layer outer reinforcing layer, the end of the belted layer outer reinforcing layer extends to the tire shoulder, and the belted layer outer reinforcing layer and the belted layer inner reinforcing layer are attached to the tire shoulder. In order to solve the problem of shoulder empty disease at the tire shoulder position under heavy load at present, the inner reinforcing layer and the outer reinforcing layer are respectively arranged on two sides of the belted layer and are attached to the tire shoulder position, one end of the inner reinforcing layer is in lap joint with the belted layer, and the other end of the inner reinforcing layer extends to the tire side, so that the strength of the tire shoulder is improved, and the occurrence risk of shoulder crown empty quality disease is reduced.

Description

technical field [0001] The invention relates to the field of radial tires, in particular to a heavy-duty radial tire and a manufacturing method. Background technique [0002] The load performance of tires refers to the ability of tires to carry a load and drive normally. With the development of economy and changes in transportation conditions, vehicles in some areas have extremely high requirements on the load-bearing capacity of tires due to heavy loads and over-heavy loads. The requirements for speed and distance capability are getting higher and higher. [0003] Heavy-duty tires operate under harsh conditions. Due to their relatively wide tread, the hoop forces of conventional belts are unevenly distributed across the tread. During running, the shoulder area is relatively radial to the rest of the tread. Greater expansion increases tire rolling resistance and causes uneven wear. At the same time, the creep of the tread, the belt layer and the carcass end point during th...

AI Technical Summary

Problems solved by technology

[0003] Heavy-duty tires have harsh operating conditions. Due to their relatively wide tread, the hooping force of the traditional belt layer is unevenly distributed in the transverse direction of the tread. During driving, the radial direction of the shoulder area relative to the rest of the tread Greater expansion increases tire rolling resistance and causes uneven wear

At the same time, the creep of the tread, belt layer and carcass end point during driving causes high heat generation at the shoulder and spigot position, and delamination or cracks are likely to occur at the edge of the belt layer or the carcass end point

When the load increases, these phenomena will become more obvious, and the probability of early tire damage is higher, especially for short- and medium-distance ultra-high-heavy-duty tire products. On the one hand, the product’s shoulder-to-shoulder performance is insufficient: mainly manifested in the shoulder-to-shoulder air mass in high-temperature environments in summer There are many diseases; on the other hand, the bearing capacity of the toes is insufficient: the main manifestations are severe ultra-high and heavy loads, and there are many diseases such as empty cracks in the toes

Most of the solutions provided in the prior art restrict the radial expansion of the tire during running by helically winding the circumferential reinforcement layer, which is the circumferential reinforcement of the crown area, and does not address the shoulder and toe under heavy loads. It is difficult to meet the requirements of heavy-duty tires for shoulder strength and toe load-carrying capacity

Images