Abstract: Considering tilt and actual wear profiles of slipper and combining the external forces on slipper, the dynamic equations to describe micro-movement of slipper are established. In order to introduce the elastohydrodynamic lubrication effect caused by the pressure distribution under the slipper, the slipper’s stiffness characteristics are studied. The slipper’s kinetic equation, transient Reynolds equation, oil film description equation, elastic deformation equation and recess pressure governing equation are solved simultaneously to obtain the coupled solution of slipper’s dynamics and tribology. The lubrication properties and the micro-movement of slipper in whole working cycle are obtained. Moreover, micro-wear profiles and surface deformation effects on the slipper’s dynamic characteristics are analyzed as well. The results show that wear profiles to some extent and elastic deformation can guarantee the stability of slipper load capacity, while large wear profile lead to reduction of carrying capacity and decrease the slipper’s minimum film thickness. When slipper with wear surface profile locates in low pressure suction area, it will tilt heavily. Wear profile and elastic deformation have some influences on friction torque.

Key words: Axial piston pump, Dynamic characteristics, Elastohydrodynamic lubricaiton, Slipper