Abstract: The deep-shallow pocket hybrid bearing of spindle assembly of the high precision CNC lathe was taken as the object， the computational fluid dynamics software was used to analyze oil film characteristics of deep and shallow pocket hybrid bearing on the basis of theoretical modeling and analysis. The influence of speed， oil pressure， eccentricity， oil film thickness and angle of deep pocket on the bearing capacity， flow and temperature rise of the oil film were analyzed. The results showed that the flow of the oil inlet hole increases first and then decreases with the increase of the spindle speed， and gradually decreases with the increase of the eccentricity of the spindle. The oil film temperature gradually decreases with the increase of the external oil supply pressure and tends to be gentle. When the oil film thickness is about 0.03mm， the bearing capacity and temperature rise are most suitable. When the angle of the deep cavity is 10°， the dynamic pressure effect of the oil film is the most obvious， and the oil film bearing capacity is the strongest.

Key words: hybrid bearing, deep and shallow pocket, bearing capacity, temperature rise, flow