VALVE PLATE, AND AXIAL PISTON HYDRAULIC PUMP AND AXIAL PISTON HYDRAULIC MOTOR WITH SAME

摘要

An effectively cooled valve plate for a hydraulic motor and a hydraulic pump. A valve plate (5) used for a swash plate motor (1) having a motor shaft (4) and a cylinder block (3) which are provided in a motor housing (2). The valve plate (5) has: a sliding support surface (5f) in contact with the rear end surface (3r) of the cylinder block (3) and supporting the cylinder block (3); a support surface (5s) which is the surface on the reverse side of the sliding support surface (5f) and corresponds thereto; a center through-hole (5a) through which the motor shaft (4) penetrates; and ports(10L, 10R) formed as inlets/outlets for operating oil around the center through-hole (5a) so as to penetrate through the valve plate (5). A cooling recess (12) into which the operating oil can flow is formed in the region of the support surface (5s) which excludes the ports (10L, 10R).