Action mechanism of the overturning retainer and the slipper of axial piston machines

There is abnormal wear and fracture of the retainer in the faulty piston pump. To investigate the early failure mechanism of the fractured retainer, a model for the calculation of the transient contact between the overturning retainer and the slipper is presented. The equations of the trajectory between the overturning retainer and the slipper are established based on the transformation matrix and the operating mechanism of the slipper in the oil sucking and discharging areas. The trajectory of the push points between the overturning retainer and the slipper is solved. The failure mechanism of the retainer extrusion wear is determined. The results show that with the increase of the degree of overturning, the degree and range of extrusion and wear between the failure retainer and the slipper is increased. The research elucidates the failure mechanism of the retainer and lays the foundation for the dynamics modeling and coupling vibration analysis of the overturning retainer.