Abstract: In order to study the accidental fracture of the slipper retainer in the axial piston pump, the forces on the slipper retainer are analyzed in detail. The distribution of forces in all aspects is integrated, which shows that the slipper retainer reflects a bending moment with the boundary of suction and discharge side as the reference line in its structure. After the slipper retainer and the whole pump are simulated by ADAMS rigid flexible coupling finite element and Pumplinx fluid finite element, the calculation results show that while each piston moves around the boundary line of suction and discharge side, the stress concentration of the outer edge of the corresponding slipper retainer hole is the largest, which makes this area become the weak points of the slipper retainer movement, under the action of bending moment, these weak points become the most likely fracture risk area.

Key words: piston pump, slipper retainer, mechanics analysis, bending moment, stress concentration, weak points, fracture