关键词: 径向柱塞泵, 表面形貌, 弹性变形, 联合仿真, 参数分析

Abstract: Considering the rough surface contacts and elastic deformations of the piston bushing in the radial piston pumps， the theoretical model was established for the piston/bushing interfaces under the mixed-elastohydrodynamic lubrication conditions. The effects of elastic deformations and surface morphology caused by different inlet pressures and cam speeds on the friction and sealing characteristics were analyzed， through the co-simulation of MATLAB and ANSYS， and the combination between the finite-differential method and finite-element method. The results show that the elastic deformations of piston bushing have significant influences on the contacts of micro-convex bodies in the piston/bushing interfaces， which is related to the inlet pressures and cam speeds. The elastic deformations and surface morphology may affect the friction power losses and leakage as well， and the former is the greater one. Besides， the friction and sealing characteristics of the piston/bushing interfaces are sensitive to the working conditions， and the friction power losses， the couette flows and the poiseuille flows raise in varying degrees with the increases of inlet pressures or cam speeds. 

Key words:  , radial piston pump, surface morphology, elastic deformation, co-simulation, parameter analysis