Analysis of Water Film Dynamic Characteristics of Slipper Pair in a Water Hydraulic Axial Piston Pump/Motor

To obtain the dynamic characteristics of the slipper's bottom surface, overturning and wear profiles of the slipper were considered, the force/torque on the slipper was analyzed, and the precise solution of slipper pair's hydrodynamic water film was realized based on Matlab. Results show that when the pressure in the piston chamber is constant, the film thickness of the slipper increases with increasing cylinder speed. There is little difference between three points film thickness in the high pressure zone, and the slipper obviously slants. At 120° from TDC, the cylinder speed has little effect on the pressure field of slipper bottom. At 240° from TDC, the hydrodynamic effect of the slipper is significantly enhanced. When the cylinder speed is constant, the film thickness and the inclination of the slipper gradually decrease with increasing piston chamber pressure. At 120° from TDC, the peaking pressure of slipper bottom increases with increasing piston chamber pressure, at 240° from TDC, the slipper bottom pressure slightly increase with increasing piston chamber pressure, the cental film thickness and the minimum film thickness increases with increasing cylinder speed, decreases with the increase of the piston chamber pressure, and the decreasing gradually slows down. The above results can provide guidance and reference for the designing and optimization of water hydraulic axial piston pump/motor slipper pair.