FEED CONTROLLER FOR AXIAL-PLUNGER PUMP Russian patent published in 1995 - IPC

FIELD: hydraulic drives. SUBSTANCE: differential piston having lateral bore is mounter inside the housing to define above-piston and under-piston spaces. A movable sleeve kinematically coupled with the controlled link is received in the bore. The sleeve has the inner ring groove connected with the above-piston space of the housing. A spring-loaded differential plunger is mounted inside the sleeve to define a control chamber connected with the under-piston space of the housing and to permit overlapping the groove of the sleeve and interaction with one of the arms of a rotatable double arm lever. The lever is mounted on the rocking axle inside the housing. The second arm of the lever bears on the spring-loaded pusher. A booster having the control chamber bears on the second arm of the lever toward the pusher. The pusher is spring-loaded in the direction of a moment created by the lever. This direction is coincident with the direction of a moment exerted by interaction of the lever with the differential plunger. The outlets of the check valves are connected to the under-piston space of the housing. The inlet of one of the valves is connected to the power source. The input of the other one is connected to the delivery line of the pump. The source of control pressure is in communication with the control chamber of the booster. EFFECT: enhanced reliability. 2 cl, 1 dwg