ACTUATOR Russian patent published in 1999 - IPC

FIELD: electrohydraulic drives; manufacture of rockets and aeroplanes; shipbuilding. SUBSTANCE: actuator includes electric motor, three-gear pump creating one flow of working fluid, actuating hydraulic cylinder and four-throttle spool-type hydraulic distributor including electromechanical converter, bell crank, flat loading spring and spool valve plungers having lands which are located in hollow revolving axles of pump (sleeves of hydraulic distributors). Walls of axles have through round radial and rectangular holes. Lands of plungers form complexes of filling and draining throttle ports together with rectangular holes. Axles of driven gears of pump are provided with slots made on outer cylindrical surfaces in planes perpendicular to axes of plungers and passing through axes of rectangular holes; number of slots corresponds to number of rectangular holes. Presence of such slots reduces flows caught by wall of axles and reduces slope of total velocities of flows relative to axes of spool valve plungers, thus increasing hydrodynamic forces acting on plungers. EFFECT: enhanced sensitivity of actuator. 2 dwg