ELECTROHYDRAULIC SERVO DRIVE Russian patent published in 2003 - IPC

FIELD: aircraft industry. SUBSTANCE: proposed drive is designed for aircraft control system. Cradle accommodating axial-plunger or axial-piston pump is hinge-connected at one side with cylindrical plunger of servomechanism through axial longitudinal rectangular slot made in middle of plunger, and at other side it is pressed through pusher by spring through maximum capacity angle. Control space of servomechanism communicates with two control ports of hydraulic distributor through central groove of power limiter made in form of spring-loaded double-land spool with possibility of disconnection of its central groove from control channel of hydraulic distributor and communicating it through edge of safety valve with drain. Moreover, speed regulator is installed additional in pump suction channel made in form of double-land spring-loaded spool whose left-hand end face space communicates with delivery channel, and spring-loaded space communicates with two control ports of hydraulic distributor. Drain channels of hydraulic distributor communicates with central groove of spool which, in its turn, communicates with suction channel of pump through variable restrictor. EFFECT: reduced mass and overall dimensions of pump cradle, enlarged bandwidth of low-frequency control signals, simplified mechanical coupling with cradle, increased efficiency of pump. 2 cl, 1 dwg