COMBINED DRIVE Russian patent published in 2008 - IPC B64C13/22 

FIELD: transport, aircraft engineering.

SUBSTANCE: proposed combined drive incorporates housing communicating with pressure and discharge hydraulic lines, hydraulic engine with power piston, electro-hydraulic power booster, steering machine cross-over valve and feedback pickup, spring-loaded stop, check valve, electro-hydraulic valves, duplicated slider cylindrical control valve, hydraulic accumulator with piston, check valve and spring and two-way cross-over valve. The outer cylindrical surface of every plunger of the drive two-way cross-over valve communicates, via additional hydraulic channel, with the hydraulic engine chamber communicating, in its turn, with the other plunger outer end face. At that every additional hydraulic channel on the aforesaid surface is arranged in 180 degrees relative to the hydraulic channel communicating the said plunger surface with the pressure hydraulic line.

EFFECT: higher reliability of aircraft control system.

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