Research on the piston with damping hole and pressure recess of axial piston motor

Abstract

Based on the principle of hydrostatic bearing, in this study, several novel kinds of pistons were designed out, and the mathematic model of hydrostatic bearing on piston was established and analyzed. It was also found that, the diameter of damping hole and the width of pressure recess had impact on the radial load capacity of piston, the overall efficiency of axial piston motor, and the friction and wear capacity of piston. Results from tests shown that in the case of the pressure difference of 10MPa to 22MPa and the different speed of 500rpm to 2000rpm, the overall efficiency of axial piston motor could be improved by 0.1%-0.6%, compared to the ordinary piston. On the other hand, the wear scar of the piston modified was circular, and the one of the ordinary piston was longitudinal and deep, which shown that the piston modified could improve the wear capacity.