Composite steel traveler and tire bead structure using it

Abstract

The invention relates to a steel traveler compound and a tire bead structure using the same. The steel traveler composite part includes a steel traveler, and a high thermal expansion compound rubber strip is wound outside the steel traveler. The tire bead structure includes a carcass layer, an inner liner and an apex composite, and is characterized in that it also includes a steel wire mouth layer, a sidewall wear-resistant rubber and a steel traveler composite, and the side edge of the carcass layer is wrapped around the steel traveler The composite part is folded, the steel wire slit layer is wrapped outside the folded part of the carcass layer, the apex composite part is attached to the upper end of the steel traveler composite part and partially surrounded by the side edge of the carcass layer; the inner lining The layer is attached to the outer side of the steel wire slit layer, and the sidewall wear-resistant rubber is set on the outermost layer of the bead structure, and the steel traveler composite, carcass layer, inner liner, steel wire slit layer and apex composite are all wrapped Among the sidewall wear-resistant rubber. The invention can avoid the reduction of the strength of the tire carcass caused by excessive friction, and greatly improve the service life and safety of the tire.

Description

technical field [0001] The invention relates to a steel traveler composite part and a tire bead structure using the same, which belongs to the technical field of tire manufacturing. Background technique [0002] All-steel radial tires have a series of advantages such as fuel saving, wear resistance, high mileage, handling stability and excellent adhesion performance, and the proportion of all-steel radial tires in tires is increasing day by day, which is the development direction of tires. Since all-steel radial tires are mainly used on trucks and buses, the particularity of their use puts forward higher quality requirements for the tires, including high load capacity, large traction force and good cushioning capacity. The carcass and bead are the main skeleton parts of the tire, and the function of the carcass is to ensure that the outer tire has the necessary strength and can withstand certain air pressure and load, as well as external impact. The function of the bead is ...

AI Technical Summary

Problems solved by technology

If there are problems in these two parts, it will greatly affect the safety performance of tires and cars.

[0003] However, the domestic tire industry is currently facing such a big problem: since most all-steel radial tires use hexagonal bead rings, the stress concentration occurs at the contact point between the inner end of the bead ring and the carcass, and the overall force is concentrated on one line. There is an obvious shear stress concentration on the carcass steel wire. When the tire is subjected to a large load-bearing force during use, the bead wire at the inner end of the bead ring will directly contact the carcass steel wire and cause friction to cause the strength of the tire carcass to decrease. If the friction is excessive, the carcass will be damaged, and in severe cases, a single or the whole carcass steel wire will break, resulting in a blowout.

Although there is also a structure of wrapping nylon cloth outside the bead ring, it has the disadvantage that the rubber material is easy to flow. After the tire is molded and vulcanized, the bead parts are squeezed between each other, which will cause too little rubber material, especially the steel wire. Insufficient compound between the bead wire at the inner end of the bead and the carcass of the turn-up traveler is more serious, thus having limited effectiveness in avoiding excessive friction between the bead wire and the carcass wire

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