HYDRAULIC PUMP AND MOTOR

An embodiment of the present invention relates to a motor for a hydraulic pump. The motor for a hydraulic pump according to an embodiment of the present invention includes a drive shaft; a swash plate inclined with respect to the drive shaft; a cylinder block rotated together with the drive shaft and having a plurality of cylinder chambers; a hydraulic piston reciprocating in the cylinder chamber according to rotation of the cylinder block by the swash plate; a valve plate coming into contact with the cylinder block to be able to slide, and having an outlet port and an inlet port which can communicate with the cylinder chamber, a notch groove formed at an end of the outlet port, and a first orifice penetrating the notch groove; and a valve block having an outlet pipe and an inlet pipe each communicating with the outlet port and the inlet port of the valve, a pulsation reducing chamber communicating with the first orifice, and a second orifice communicating with the pulsation reducing chamber and the outlet pipe.