Pre-tightening type double-lip seal structure of cardan joint

Abstract

The invention relates to a pre-tightening type double-lip seal structure of a cardan joint. A reducing part is formed on the outer surface of the open end of a cylindrical wall body of an outer ring, the outer diameter of the reducing part is smaller than the outer diameter of the cylindrical wall body, an outer annular groove is formed on the root of the reducing part, and an inner annular groove is arranged on the inner surface of the cylindrical wall body, which is adjacent to the open end. An oil seal comprises an oil seal framework and a rubber body, the rubber body comprises an inner ring and an outer ring which are connected into a whole and extend towards the same side, a double-lip structure is formed on the inner wall of the inner ring, part of the oil seal framework is embedded in the outer ring, the end part of the oil seal framework extends outside the outer ring and forms an outward turning part, the outward turning part is pressed in the inner annular groove of the outer ring, an annular spring groove is formed between the inner ring and the outer ring, and an annular locking spring is arranged in the annular spring groove. A dust cover comprises a cover body and a dust cover framework, the cover body comprises an outer cover ring, a middle cover ring and an inner cover ring which are connected into a whole and extend towards the same side, an internally protruding ring is formed on the inner wall of the outer cover ring and is clamped in the outer annular groove of the outer ring, the middle cover ring is adjacent to the inner wall of the outer ring, the outer wall surface of the inner cover ring is a conic surface, and the end of the inner ring of the rubber body of the oil seal is pressed on the conic surface of the outer wall surface of the inner cover ring.

Description

technical field [0001] The invention relates to a pre-tightened double-lip sealing structure of a universal joint, which belongs to the technical field of universal joint production. Background technique [0002] In the prior art, most of the dust cover, oil seal and outer ring of the cross shaft universal joint are not directly positioned axially, such as a cross shaft universal joint that is easy to assemble (patent number: CN01210724.7), which mainly A retaining ring groove is provided inside the mouth end of the outer ring, and a corresponding opening retaining ring is built in it. The opening groove can be arranged directly on the inner side of the mouth of the outer ring, or it can also be arranged on the oil seal seat there. The axial positioning of the dust cover, the oil seal and the outer ring of the above-mentioned patent is mainly realized by the open retaining ring, and its positioning reliability is poor, resulting in poor sealing and dustproof effects of the c...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pre-tightened double-lip sealing structure of the universal joint which is beneficial to the positioning between the dust cover, the oil seal and the outer ring, and which is beneficial to improving the sealing and dustproof effect of the cross shaft universal joint, and solves the problem The positioning reliability between the dust cover and the oil seal and the outer ring in the existing technology is poor, resulting in problems such as poor sealing and dustproof effects of the cross shaft universal joint

Images