A piston pump working principle: MCY14-1B quantitative axial piston pump, as shown in Figure 1, the principle is relatively simple, the pump drive shaft and the cylinder spline, which led to the cylinder rotates, the uniform issued in the cylinder seven on the plunger around the drive shaft rotates. Each plunger end of a slipper the centering spring through the inner sleeve ball, return plate slipper pressure on the axis tilt angle of the swash plate. When the cylinder rotates, the plunger simultaneously reciprocated to complete the action of the suction and pressure oil. Centering spring through the jacket of the cylinder pressure with oil pan, from the initial sealing. Shoe with oil hydraulic hydrostatic equilibrium, not only reduces the wear on the pump, and the pump having a high volumetric efficiency and mechanical efficiency.