A novel central inflation / deflation structure for drive axles

By combining oil and gas seal structures, the problems of poor sealing performance and rapid temperature rise of the central air-filling and deflation structure of the drive axle are solved, achieving high reliability and efficient assembly, and improving the vehicle's driving safety and ability to operate under harsh conditions.

CN116001494BActive Publication Date: 2026-05-26SHAANXI HANDE AXLE CO LTD
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Patent Information

Application Number
CN202211224735.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-09
Publication Date
2026-05-26
Estimated Expiration
2042-10-09

AI Technical Summary

Technical Problem

The existing central inflation/deflation structure of the drive axle has poor sealing performance, resulting in high frictional torque, high temperature, rapid temperature rise, and short lifespan during operation, which affects vehicle driving safety and use under harsh conditions.

Method used

The system employs a combined oil-air seal structure, including an oil seal lip and an air seal lip, which are uniformly encapsulated by a skeleton. The oil seal lip ensures the seal on the lubricating oil side, while the air seal lip ensures the seal on the high-pressure air side. A heat-conducting spacer ring is used to quickly dissipate the heat generated by friction, thereby reducing the component temperature.

Benefits of technology

It improves sealing performance and operational reliability, reduces frictional torque and temperature rise, extends component life, and improves assembly efficiency.

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Abstract

This invention relates to a novel central air filling and deflation structure for a drive axle, comprising a shaft end, a bushing, a hub, and a combined oil-air seal. The bushing is fixedly connected to the shaft end; the shaft end passes through the hub and is fixedly connected to it; the hub is provided with a combined oil-air seal and an air filling and deflation channel; both the shaft end and the bushing have communicating air filling and deflation holes, which communicate with the air filling and deflation channel on the hub; combined oil-air seals are provided on both sides of the air filling and deflation channel. The oil sealing lip and the air sealing lip of the combined oil-air seal are designed separately and uniformly packaged. The oil sealing lip ensures the sealing requirements of the lubricating oil, and the air sealing lip ensures the sealing requirements of the high-pressure air. The two work in a complementary manner, thereby effectively ensuring the sealing performance of the central air filling and deflation structure.
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