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

The retainer in the faulty piston pump exhibits abnormal wear and fracture. To investigate the early failure mechanism of the fractured retainer, a model is presented for calculating the transient contact between the overturning retainer and the slipper. The trajectory equations 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 oil-discharging areas. The push point trajectory between the overturning retainer and the slipper is determined, while also identifying the failure mechanism of the retainer extrusion wear. The results demonstrate that as the degree of overturning increases, there is an escalation in both the extent and range of extrusion and wear between the failure retainer and the slipper. This research elucidates the failure mechanism of the retainer, thereby establishing a fundamental basis for dynamic modeling and coupled vibration analysis of overturning retainers.