空间相机扫描机构固体润滑轴承组件的寿命试验

开展了固体润滑轴承组件的真空加速寿命试验,以验证固体润滑轴承组件的设计是否满足在轨寿命要求。研究了MoS2基薄膜固体润滑轴承组件在小角度摆动情况下的寿命。试验采用4对轴承模拟在轨±6°连续往复摆动,通过检测轴承组件工作时的摩擦力矩、电机电流和轴承温升判断轴承运行状态。结果显示,寿命试验运行正常,累计摩擦次数为6.2×10~7次。寿命试验后对轴承进行了尺寸精度和旋转精度复测,然后对轴承组件进行了解剖分析。复测结果显示,轴承尺寸精度和旋转精度与试验前一致,轴承润滑状态良好。试验结果验证了固体润滑轴承组件寿命满足在轨任务要求,为其它空间相机小角度摆动的扫描机构固体润滑轴承组件的长寿命设计提供了依据。

Life test of solid-lubricated bearing assembly for scan mechanism of space camera

An accelerated vacuum life test for solid-lubricated bearing assemblies of the scan mechanism in a space camera was performed to obtain their working life. The working life of MoS₂ solid based solid lubrication bearing assembly under a small angle oscillation was researched. The continuous oscillation of 4 pairs of bearings at ±6°was simulated and tested. During the life test, the friction moment, the current of motor and the temperature rise of bearings were inspected to estimate their running states. The experiments show that the life test has run very well, the working life of the bearing assemblies is 6.2×10⁷ times. The dimensional precision and running accuracy of the bearings were measured after life test, and then the dissection analysis of the bearing assemblies was also taken. The results indicate that the dimensional precision and running accuracy of the bearings are the same as that of the life test and the lubrication condition of the bearings is good. These results validate that the working life of solid-lubricated bearing assemblies satisfies the requirement of task in orbit. It provides technological supports for the long life design of solid-lubricated bearing assemblies for scan mechanisms of space cameras under smaller angle oscillation.