ELECTROHYDRAULIC ACTUATOR UNIT Russian patent published in 2006 - IPC B64C1/00 F15B9/08 

FIELD: flying vehicle control systems.

SUBSTANCE: proposed electrohydraulic actuator unit has housing 1 with passages connected with hydraulic pressure and return lines and cavities of actuating hydraulic cylinder 2 provided with actuating piston 3, electrohydraulic power amplifier 4, servo unit made in form of hydraulic cylinder with piston 5 connected with spool valve distributor 6 having beads, electrohydraulic valve 7, cut-in valve in form of spring-loaded distributing plunger 8 to which hydraulic pressure and return lines, lines of cavities 13 and 14 of actuating hydraulic cylinder 2 and spool valve distributor 6 are connected. Servo unit is provided with two spring-loaded check valves 17 and 18 for passage of working fluid to one of cavities of actuating hydraulic cylinder 2; one check valve is used for admitting working fluid from hydraulic return line.

EFFECT: avoidance of seizure of servo unit components in bringing the controls in retracted position; enhanced operational reliability.

2 cl, 1 dwg