The axis of the swashplate of the swash-axis type is the same as the axis of the drive shaft. It is due to the plunger cylinder body relative to the drive shaft tilted at an angle so that the plunger for reciprocating motion. The flow rate adjustment is realized by swinging the angle of the plunger cylinder body, so some of them are also called swinging cylinder type. Compared with the swash plate type, it is reliable and has a large flow rate, but the structure is complicated. Compared with radial piston pump, axial piston pump has high discharge pressure, which can generally work within the range of 20-50MPa, high efficiency, small radial size, compact structure, small volume, light weight. However, the structure is more complex than radial piston pumps, and the processing and manufacturing requirements are high.