空间用导电滑环真空高低温摩擦力矩特性分析

Frictional Torque Analysis of Space Conductive Slip Ring under Vacuum and High and Low Temperature Environment

为研究空间用导电滑环在热真空试验过程中的摩擦力矩特性,根据滑动电摩擦理论和摩擦学理论,从同真空和温度两方面对导电滑环的环-刷摩擦副和轴承摩擦副的摩擦力矩特性进行分析。分析结果表明:真空环境主要影响环-刷摩擦副的摩擦界面特性,造成摩擦副摩擦因数增大,从而导致摩擦力矩增大;高低温环境主要影响轴承的预紧力,在高温环境下影响较小,在低温环境下导致预紧力增大,摩擦力矩显著增大。通过搭建摩擦力矩测试系统,对理论分析结果进行了验证。试验结果表明:真空和高低温环境下滑环摩擦力矩分别约为常温常压下摩擦力矩的1.2和1.4倍;滑环摩擦力矩受轴承摩擦力矩影响较大,环-刷摩擦副对摩擦力矩影响较小。

In order to study the frictional torque characteristics of the space slip ring in the thermal vacuum test,the frictional torque characteristics of the ring-blush pairs and the bearing pairs were analyzed from the vacuum and temperature combined with the theory of sliding electric contact and the theory of tribology.The analysis results show that the vacuum environment mainly affect the friction interface characteristics of the ring-blush pairs,resulting in the increase of friction coefficient of the friction pairs and the increase of frictional torque.The high and low temperature environment mainly affect the preload of the bearing.The high temperature has a small impact on the preload,while low temperature results in a significant increase in the preload and frictional torque.The friction torque testing system was constructed to verify the analysis results.The experimental results show that the frictional torque under the high and low temperature vacuum environment is 1.2 and 1.4 times of the frictional torque under the atmospheric pressure.The friction torque of bearing have greatly influence on the slip ring than the ring-blush.