Patent ID: 8523536

Claim:
An axial piston pump that generates hydraulic pressure by means of rotational power input from a drive shaft, the axial piston pump comprising: a cylinder body that forms therein a cylinder chamber extending in an axial direction of the drive shaft and rotates integrally with a driven shaft; a piston that is inserted into the cylinder chamber and reciprocates in the axial direction of the drive shaft in the cylinder chamber; and a cam device that rotates integrally with the drive shaft and has: a fixed cam member that has a cam surface capable of coming into contact with a cam follower coupled to the piston and rotates integrally with the drive shaft, with movement of the fixed cam member in the axial direction being restricted; and a movable cam member that has a cam surface capable of coming into contact with the cam follower and rotates integrally with the drive shaft, with movement of the movable cam member in the axial direction being allowed, an irregularity difference in the axial direction of the cam surface of the fixed cam member and an irregularity difference in the axial direction of the cam surface of the movable cam member being different from each other, wherein the fixed cam member and the movable cam member are disposed coaxially with the fixed cam member disposed on an innermost side, and an inner circumferential surface of the movable cam member is spline-coupled to an outer circumferential surface of the fixed cam member.