MECHANISM FOR CONTROL OF DISPLACEMENT OF AXIAL-FLOW PISTON HYDRAULIC MACHINE Russian patent published in 1995 - IPC

FIELD: displacement hydraulic drives; control units of axial-flow piston hydraulic machines in constant power mode. SUBSTANCE: at change of pressure in cylinder connected with pressure line of hydraulic machine, two-edge distributing throttle spool valve moves in pin getting in contact with step bearing over convex working surface of one lever. Open hole is brought in communication with pressure line of cylinder and due to difference in areas of differential piston, it is set in motion in housing making unit 8 turn to position corresponding to new magnitude of flow rate. Convex surface of lever ensures change of flow rate in function of pressure corresponding to constant power mode. EFFECT: enhanced accuracy of control of axial-flow piston hydraulic machine in constant power mode. 3 dwg