Abstract: The variation law of the friction torque is explored for the friction torque of low-speed and light-load aerospace bearing. A mathematical model of friction torque of solid lubricating aerospace bearing is established, and a balance equation of bearing under load is established based on the quasi-state of bearing. The axial preload is due to axial preloading, and the radial partial load is induced by the radial assembly deviation. The situation of ball under loading is analyzed, which is caused by the assembly deviation. The influence law of axial preload and radial position deviation on the friction torque of bearing is obtained. The results show that the elastic hysteresis friction torque, micro-sliding friction torque and self-spin friction torque of bearing increase with the increase in axial preload and radial partial load. Under the axial preload, the increasing trends of elastic hysteresis friction torque and self-spin friction torque in the components of friction torque are convex downward, while the increasing trend of micro-slip friction torque is convex upward. Under the radial partial load, the increasing trend of frictional moment component growth is convex downward. The micro-sliding friction torque and the elastic hysteresis friction torque are the main components of friction torque of aerospace bearing. While the load increases, the friction torque increases. The effect of load on the differential friction torque is the most significant, followed by elastic hysteresis friction torque and self-spin friction torque. Key

Key words: aerospacebearing, preload, assemblypositiondeviation, frictiontorque