Oil seal structure of intermediate support assembly

By designing an intermediate support assembly oil seal structure that combines an outer skeleton and an inner skeleton, the problem of poor oil seal sealing performance was solved, achieving sealing and ventilation functions in harsh environments and extending the service life of the oil seal and intermediate support assembly.

CN224352395UActive Publication Date: 2026-06-12DANJIANGKOU DANJIANG AUTO TRANSMISSION SHAFT CO LTD
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Patent Information

Application Number
CN202521414914.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-08
Publication Date
2026-06-12
Estimated Expiration
2035-07-08

AI Technical Summary

Technical Problem

The existing intermediate support assembly has poor oil seal performance, which affects its service life and makes it prone to damage in harsh environments.

Method used

Design an oil seal structure for an intermediate support assembly, which combines an outer oil seal skeleton and an inner oil seal skeleton. The inner and outer cutting edges are made of rubber bodies, and the inner and outer cutting edges form a structure similar to a one-way valve. The vent is set on the inner oil seal skeleton. The outer cutting edge does not directly contact the mud and sand, and the inner cutting edge achieves sliding and sealing.

Benefits of technology

It effectively prevents foreign matter from entering the inner cavity, extends the life of the oil seal and intermediate support assembly, ensures that the bearing exhausts and removes grease at high temperatures, keeps the inner cavity clean, and realizes the axial sliding function.

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Abstract

The oil seal structure of the intermediate support assembly comprises an oil seal outer framework, an oil seal inner framework, an inner cutting edge and an outer cutting edge, the oil seal outer framework is annular, the end portion of the oil seal outer framework is bent outwards to form a blocking edge, the inner framework is annular with an L-shaped section, and the inner framework is clamped in the blocking edge. The outer cutting edge is annular, and a clamping groove is formed in the edge of the outer cutting edge. The oil seal outer framework and the oil seal inner framework are pressed into the whole oil seal assembly in an interference mode, the inner cutting edge can slide on the shaft neck of the middle spline shaft opposite to the middle bearing assembly, grease is sealed in an inner cavity of the middle bearing assembly, impurities are prevented from entering the inner cavity of the middle bearing assembly, and the service life of the middle bearing assembly is prolonged. Meanwhile, redundant grease can be discharged; the outer cutting edge protects the inner cutting edge from being in direct contact with silt, the silt is prevented from damaging a first group of oil seals formed by the inner cutting edge and the oil seal inner framework in a severe environment, the service life of the first group of oil seals is prolonged, and the service life of the intermediate support assembly is also prolonged.
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