All-steel radial heavy-duty tire

Abstract

The invention provides an all-steel radial heavy-duty tire and relates to the field of tires. The tire comprises a carcass ply layer, wherein the carcass ply layer comprises a main body part and a return part, the main body part passes through a tire sidewall part from a tread part to reach a bead core of a bead part, and the return part is connected with the main body part and returns from the axial inner side of the all-steel radial heavy-duty tire to the axial outer side around the bead core. The tire further comprises lower composite apex rubber and upper composite apex rubber, wherein the lower composite apex rubber comprises lower hard apex rubber and lower soft apex rubber, the lower hard apex rubber is closely attached to one side, far away from the tire axis, of the main body part and the bead core respectively, and the lower soft apex rubber is closely attached to the lower hard apex rubber and the return part respectively; the upper composite apex rubber comprises upper hard apex rubber and upper soft apex rubber which are closely attached to each other, and the upper soft apex rubber and the lower soft apex rubber clamp at least one part of the return part which extends from a turn-up end of the return part. According to the tire, abrasion to the turn-up end of the carcass ply layer due to stress concentration can be effectively avoided, and the probability of deformation of the tire is decreased.

Description

technical field [0001] The invention relates to the field of tires, in particular to an all-steel radial heavy-duty tire. Background technique [0002] Such as figure 1 As shown, the bead of the tire in the prior art includes an inner hard apex core 4, an outer soft apex core 8, a carcass ply 2, a spigot reinforced steel cord ply 3, a spigot rubber 5, and a sidewall rubber 6. Nylon ply 7. Lining 1. [0003] The turn-up end of the carcass ply 2 of this tire has concentrated stress and is easily worn. The slit reinforcing steel cord 3 near the rim flange area is also easily compressed and deformed. This can easily lead to quality problems such as empty rings, ring cracks, and bursting of the tires. In addition, the bead structure of this tire has insufficient support performance, and the tire is easily bent on the rim flange, and the amount of deformation during deformation is relatively large. [0004] This solution is difficult to meet the needs of users under the con...

AI Technical Summary

Problems solved by technology

[0003] The turn-up end of the carcass ply 2 of this tire has concentrated stress and is easily worn

The spigot reinforced steel cord 3 near the rim flange area is also easily deformed by compression

This will easily lead to tire quality problems such as ring voids, ring cracks, and bursts.

In addition, the bead structure support performance of this tire is insufficient, the tire is easy to bend on the rim flange, and the deformation amount during deformation is relatively large

[0004] This solution is difficult to meet the needs of users under the conditions of severe overload and high air pressure in the current transportation market, and needs to be improved

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