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

摘要

To provide a valve plate to be effectively cooled and used in a hydraulic motor and a hydraulic pump. A valve plate (5) is used in a swash plate type motor (1) including a motor shaft (4) and a cylinder block (3) in a motor housing (2) and includes: a sliding supporting surface (5f) contacting a rear end surface (3r) of the cylinder block (3) to support the cylinder block (3); a supporting surface (5s) that is a surface corresponding to and opposite to the sliding supporting surface (5f); a central through hole (5a) through which the motor shaft (4) penetrates; and a plurality of ports (10L) and (10R) formed around the central through hole (5a) as inlets and outlets of operating oil so as to penetrate the valve plate (5), and a cooling concave portion (12) into which the operating oil flows is formed in a region except for the ports (10L) and (10R) on the supporting surface (5s).