STANDBY SERVO HYDROMECHANICAL DRIVE Russian patent published in 2009 - IPC B64C13/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to aircraft engineering, particularly to hydromechanical drives to be used in aircraft actuators. Proposed drive incorporates, for its each hydraulic system, the mechanism to lock hydraulic distributor, consisting of two spring-loaded cylindrical two-stage aligned plungers. The latter have dead and radial orifices arranged in larger stage, two flats on outer surface of aforesaid stage, adjoining the end face on the side smaller-diametre stage. Plungers are arranged in the drive housing bore furnished with chamber in its central part. Note here that four grooves are arranged in pairs in aforesaid bore. Every plunger of the mechanism has its smaller-diametre stage outer end face in contact with thrust ledge fitted on the end of moving tie-rod arranged in the housing parallel to plunder axis. Aforesaid thrust ledge has its one end pivoted to the drive bellcrank.

EFFECT: higher efficiency.

2 cl, 5 dwg