CONTROL MECHANISM OF WORKING VOLUME OF AXIAL-PISTON HYDRAULIC MACHINE Russian patent published in 1998 - IPC

FIELD: hydraulic drives, applicable in control mechanisms of working volume of axial- piston hydraulic machines. SUBSTANCE: the mechanism has a differential piston linked with the hydraulic machine pumping unit, spring-loaded double-arm lever, distributing control valve installed in transverse opening of the differential piston and engageable with one of the lever arms, control piston engageable with the other lever arm and installed in the working chamber communicating with the control line, and the control piston is installed for turning the double-arm lever in the direction opposite the spring action. The power governor may be made in the form of a spring-loaded three-way throttle valve connected to the control line, drainage and working chamber of the control piston, lever and spring-loaded plunger installed for movement along the lever; the opposite end of the plunger communicates with the control piston working chamber, and located in the transverse opening of the plunger is a pressure pickup made in the form of a pusher engageable with the lever, its working chamber communicates with the high-pressure line; a spring is installed on the other end of the lever for counteracting the force produced by the pusher; besides, the lever is kinematically linked with the control valve. Besides, the power governor may be made in the form of a safety valve connected to the control line, whose spring is installed for readjustment by means of a booster loaded by a spring pack and connected to the high-pressure line. The control mechanism may also be furnished with a shut-off valve, and the control piston working chamber is connected to the latter. EFFECT: improved design. 4 cl, 2 dwg