Failure analysis and structural optimization of water-based sliding bearings for aerospace applications
10.16289/j.cnki.1002-0837.2025.03010
- VernacularTitle:航天用水基滑动轴承故障分析及结构改进
- Author:
Chunmei WEI
1
;
WangXi
;
Yingbin LI
;
Dewen YIN
;
Zhenguo ZHANG
;
Hualin SHI
Author Information
1. 中国航发西安动力控制科技有限公司,西安 710077
- Keywords:
temperature compensation;
friction characteristics;
impact fracture;
structural optimization;
experimental verification
- From:Space Medicine & Medical Engineering
2025;36(3):246-249
- CountryChina
- Language:Chinese
-
Abstract:
The long service life and high reliability of SiC sliding bearings are crucial for the long-term normal operation of aerospace power equipment.In response to the fracture phenomenon observed in the sliding bearing assembly of a certain delivery pump during operation,this paper analyzes the issue from the perspectives of stress characteristics and thermal expansion effects,proposing a structural optimization design method based on temperature coefficient compensation.The research indicates that the primary cause of bearing fracture is the difference in thermal expansion coefficients between the bearing and the metal rotor under elevated temperatures,leading to axial loosening of the bearing.Additionally,the gap between the bearing and the pin,combined with unstable lubrication of the friction pair,exacerbates bearing stalling and pin impact,ultimately causing cracks and localized chipping.By optimizing the bearing structure and employing a rubber pad for torque transmission,this issue has been successfully resolved.The improved structure demonstrated high reliability and stability in bench tests,providing important theoretical and technical references for the design of bearings under similar extreme operating conditions.
