Abstract: Aimed at the problem of vibration and shock in double-valve plate radial piston pump, the mathematic models of seven kind of stator curve are established for double-valve plate radial piston pump, and the motion equation of roller center, which follows the argument-revised equally accelerated motion regularity and uniformly varied accelerated motion regularity, is revised and by means of Matlab simulation, several stator curves with different periodic angle are drawn. The characteristic parameters of the plunger pair such as degree velocity, degree acceleration, pressure angle, instantaneous torque and instantaneous flow are comprehensively compared for different stator curves and it is found by analysis that the angle velocity and acceleration curve of eighth-power stator curve will vary continuously and smoothly, the pressure angle will be moderate, the change of instantaneous torque and flow will be the smallest and the maximum of the instantaneous torque will be minimized to the full extent.

Key words: double-valve plate radial piston pump, stator curve, degree acceleration, instantaneous torque, eighth-power curve