ELECTROHYDRAULIC SERVO DRIVE Russian patent published in 1999 - IPC

FIELD: aircraft industry; hydraulic systems of aircraft. SUBSTANCE: drive has series connected setter, comparator-amplifier, electromechanical converter, hydraulic booster and pressure differential rate feedback. hydraulic booster is coupled with electromechanical converter and with hydraulic cylinder spaces. Rod of hydraulic cylinder is connected through position negative feedback with comparator-amplifier. Auxiliary feedback has hydraulic condenser made in form of spring-loaded piston. Both spaces of hydraulic condenser are coupled, through unadjustable throttles, with main hydraulic cylinder and, simultaneously, with spaces of additionally hydraulic cylinder. End chambers of additional hydraulic cylinder are connected with spaces of main hydraulic cylinder. Rod is made in form of throttle needles. Needles change areas of adjustable throttles. Feedback nozzles are connected to throttles. Spaces of adjustable throttles are coupled with control pressure. EFFECT: enhanced accuracy of operation at static load and nonrigid coupling of hydraulic motor with engine, increased damping at resonance frequencies. 1 dwg