CONTROL SYSTEM FOR GROUP HYDRAULIC DRIVE Russian patent published in 1994 - IPC

FIELD: hydraulics. SUBSTANCE: two pumps of constant efficiency are kinematically connected with a driving motor having a controller of speed of rotation and hydraulically coupled with positive-displacement hydraulic motors through delivery pipe lines. The under-piston control space of a servo cylinder is connected to the delivery pipe lines through the OR valve. The rod is kinematically connected with the motor controller. The reducing adder consists of four throttles with the common connecting point. One of the throttles is controlled. The servo cylinder has an additional control space. The two throttles are connected with the delivery pipe lines. The controlled throttle is connected with the drain pipe line. The remainder throttle is connected with the additional space. Each inlet of the OR valve is connected with the delivery pipe lines through a flow controller and with the drain pipe line through a throttle kinematically connected with a control handle. EFFECT: enhanced accuracy of controlling. 2 dwg