Patent ID: 6996981

Claim:
A hydraulic swash plate plunger unit, comprising: a rotatably supported casing having a central axis of rotation and comprising an outer wall comprising a rotationally asymmetrical balance portion, a swash plate member installed in the casing and inclined at a predetermined angle with respect to the central axis of rotation, a cylinder which is rotatably installed in the casing and has a plurality of plunger holes formed therein extending in an axial direction and arranged in a cylindrical pattern around the central axis of rotation, and a plurality of plungers which are slidably disposed in the respective plunger holes; wherein the casing is adapted to be rotated relative to the cylinder, so that the outer end portions of the plungers are sequentially pushed in an axial direction by the swash plate member to reciprocate the plungers in the plunger holes, and wherein said rotationally asymmetrical balance portion is integrally formed with the outer wall of the casing to balance the rotation thereof.