SERVO UNIT Russian patent published in 1995 - IPC

FIELD: manufacture of rockets. SUBSTANCE: servo unit has electric motor 1 whose shaft is connected with sun gear of pump 2. Chambers of hydraulic distributor 4 are connected with ball safety valves 10 and are brought in communication with chambers of hydraulic actuator cylinder 12 by means of flexible bellows pipe lines 11. When no impact loads act on rod 14 of hydraulic cylinder 12, electric motor 1 sets in rotation pump 2 which creates two flow of working fluid which run to chambers 4 of spool valve distributor via passages 3 and then to housing of servo unit through intake ports 9 provided in driven axles of the pump partially closed with spool valve plungers 8. EFFECT: enhanced reliability of operation through ensuring serviceability when rod of hydraulic actuator cylinder is acted on by shock pulse force which exceeds braking force without increase of power. 2 dwg