In recent years， along with social progress and rapid development of science and technology， people increasingly high demand on the Friction torque control is also becoming increasingly Factors affecting friction moment there are many: the contact bearing surface characteristics， the size of bearing clearance and grease， To meet the needs of high performance As well as find out the impact of factors on the vehicle steering friction moment of the Special to the In this thesis， extensive access to domestic and foreign technical literature on the basis of deep groove ball bearings under low velocity friction torque mechanism and influence factors were System introduces a variety of friction factors on the bearing friction For example: the surface roughness on the friction moment of impact; bearing clearance on the impact of friction torque; channel roundness of the bearing friction torque and friction torque of grease and so And provides the calculation of friction torque and friction torque measurement Also describes the friction characteristics of some improved modification of the friction By the method of analysis of experimental findings were At the same time in the future may be increasingly used in bearing surface modification of some of the characteristics of modification technology， research and technology trends to be The results of this research has some practical
