Analysis of oil film pressure field and temperature field of hydrodynamic and hydrostatic bearing
                             LIU Lei1,2,LIU Baoguo1,2,WANG Pan1,SHEN Huipeng1,2,DING Hao1,2,ZHENG Jinyong1,2
(1.School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 450001,China; 2.Henan Key Laboratory for Superabrasive Grinding Equipment, Henan University of Technology,Zhengzhou 450001, China）

Abstract: Aiming at the problem of bearing characteristics of deep and shallow hydrostatic bearings, the oil film pressure field and temperature field of hydrostatic bearings were simulated and analyzed.Taking  the hydraulic and hydrostatic bearings commonly used in the ultrahigh speed grinding motorized spindle system as the research object, the threedimensional finite element model of the oil film of the hydrodynamic and hydrostatic bearings was established and meshed, and then the mesh quality was evaluated. The oil film pressure and temperature distribution of deep and shallow cavity hydrodynamic and hydrostatic bearings under different rotational speed and eccentricity were calculated by using dynamic mesh technology, which can be used to change the eccentricity of the oil film. Distribution of oil film pressure and temperature in shallow chamber hydrodynamic and hydrostatic bearings was analyzed. The influence of rotational speed and eccentricity on bearing capacity and the oil film temperature rise of hydrodynamic bearing was studied. The results indicate that in the operation of deep and shallow chamber hydrodynamic and hydrostatic bearings, with the increase of rotational speed and eccentricity, the bearing capacity and temperature rise of the oil film also increase, and the influence of rotational speed on the temperature rise of the oil film is greater than that of eccentricity.

Key words: oil film pressure field；temperature field；rotational speed；eccentricity；computational fluid dynamics（CFD）