ADJUSTABLE FACE PLATE FOR HYDRAULIC PUMP OR MOTOR

摘要

The invention relates to a hydraulic axial piston pump, motor or pressure transformer with a plurality of fluid chambers in the rotating cylinder block (6). The volume of the fluid chambers (7) changes between a minimum value (discharge) and a maximum value (suction) during each rotor (6) cycle. The rotatable face plate (8) can be adjusted by means of a transmission to an adjusting shaft (9) whereby the effective stroke volume is changed. Suction and discharge ports (14) are located in the rotatable face plate (8) thereby allowing controlled overlap of discharge openings to reduce energy losses due to high pressure fluid discharged at high speed through small openings, which improves efficiency of the pump.