Abstract:According to the spin motion characteristics of angular contact ball bearings,and considering the elastohydrodynamic lubrication(EHL) effect,the EHL model of angular contact ball bearings considering spin motion was built.The multigrid method was used to solve the elastic deformation,and the finite difference method was used to solve the Reynolds equation iteratively to obtain a more accurate numerical solution.The effects of spin motion on bearing oil film pressure,thickness and oil film stiffness were analyzed under different Hertz contact pressure and surface roughness of raceway.The results show that when considering spin motion,with the increase of Hertz contact pressure and spin angular velocity,the oil film thickness is decreased and the oil film pressure is increased,and the oil film pressure area is slender and close to the contact center.With the increases of the surface roughness amplitude of raceway,the film pressure and film thickness fluctuate,and when considering spin motion,the oil film thickness is decreased obviously and the local pressure peak of the oil film is larger.The film stiffness is decreased with the increase of entrainment velocity and lubricating viscosity,and the value of oil film stiffness is increased when considering spin motion.As the spin angle velocity increases,the film stiffness is increased gradually.