ELECTROHYDRAULIC UNIT Russian patent published in 2002 - IPC

FIELD: control systems of flying vehicles where it is necessary to actuate control members by furnishing signals to electrohydraulic power amplifier. SUBSTANCE: electrohydraulic unit has housing with passages connected with pressure lines, return lines and cavities of power hydraulic cylinder, servo unit in form of hydraulic cylinder with piston connected with spool valve distributor, electrohydraulic valve, hydromechanical device in form of locking mechanism and differential bell crank whose one articulation unit is connected with locking mechanism and other articulation unit is connected with spool valve distributor; unit is also provided with cut-in valve with distributing plunger with beads to which pressure hydraulic lines, return lines and lines of cavities of servo unit , locking mechanism and electrohydraulic power amplifier are brought. When pressure is delivered to cut-in valve followed by subsequent motion of distributing plunger from one extreme position to other extreme position, hydraulic lines of unit are connected and disconnected as follows: cavities of servo unit are disconnected, pressure is delivered to electrohydraulic amplifier inlet, inner cavities of locking mechanism are disconnected from pressure line and inner cavities of mechanism are connected with return hydraulic line. EFFECT: avoidance of spontaneous operation of control members. 2 dwg