Theoretical Analysis And Experimental Study Of Space Angle Contact Ball Bearing Friction Torque

As the most basic component of the space mechanism, the space bearing is the key components constituting the other components. The reliability of space bearing is the basic guarantee for the space mechanism in aspects such as the normal operation, the realization of intended function and the service life estimation. Bearing friction torque is important parameter of shafting motion performance, rotating joint stuck occupy a large proportion in space mechanism failures. The space mechanism chronically works in space environment such as high and low temperature, alternative temperature, high vacuum, microgravity and strong radiation, which have an obviously negative impact on its friction torque directly or indirectly and friction torque could reflect the force and wear condition., and the main research contents are as follows:Static analysis for rolling bearings: Based on Hertz contact theory,a mathematical model and static equilibrium equations were established, Consider bearings deformation in a single load or combined load, and compare the influence of the various load. Analysis of the mutual influence between the loads:Establish friction torque model: For a single bearing, establish bearing inner members inter-motion model, get motion relationship between the contact surfaces,and study influence of speed on bearing ball contact load. analysis and calculation the component factors of bearing friction torque, the eventual establishment of a numerical model of bearing friction torque. Numerical calculation on research subject:Analysis of Factors Affecting friction torque; Considering the actual conditions,search influence of assembly magnitude of interference on structure size of bearings,Obtain the effect of temperature on the assembled bearing.Establish the temperature-stress model of shafting. Analysis of the relationship between the shaft member deformation, Combining theory and numerical simulation to calculate the variation of friction torque.Shaft Bearing frictional torque testing laboratories; In consideration of assembly contact surface friction force, experimental verification of actually applied preload on bearing. Then experimenting on factors such as temperature、speed、preload,assembly,getting and analyzing the experimental data. Compare with the theoretical value to obtain the influence of various factors.This thesis starting with factors such as preload、assembly、temperature, researching on the effect of various factors on the bearing friction torque, to explain practical variation of friction torque. This thesis carried out theoretical and experimental study on friction torque of spatial precision shafting bearings, By analyzing the cross-over temperature, work load, assembly magnitude of interference impact on bearing friction torque, reveals the mechanism of influence of various factors. Determine the degree of influence of each factor, provide a theoretical reference for shafting design、preload applied、friction torque determine.