Energy-loss mechanism and load capacity analysis of slipper pair in an aerial axial piston pump

Compared with hydraulic pump used in industry, aerial axial piston pump has quite different working conditions, which are mainly reflected in larger load pressure, higher rotational speed and wider range of working temperature. Research on energy-loss and bearing characteristics of oil film of friction pair under these working conditions is necessary. Slipper pair of an aerial axial piston pump was studied in this paper. Extrusion effect and thermal wedge effect due to oil expansion, as well as large range of viscosity brought by the wide working temperature have been considered in the analysis. Simulations of oil film thickness and bearing characteristic based on underbalanced and overbalanced design method have been accomplished respectively. According to the simulation results, optimizations of slipper pair structure parameters have been done to improve the bearing performance and reduce energy-loss of slipper pair.