Patent ID: 6109870
Filing Date: 2000-08-29
Classification: B64C,Y02T

Abstract:
A rotor blade flap driving apparatus comprising:a flap angularly displaceably attached to a rear edge of a blade;an actuator for generating a driving force of the flap; anddisplacement magnifying means interposed between the actuator and the flap, for magnifying an amount of displacement of the actuator,wherein the displacement magnifying means comprises:a vessel filled with a hydraulic fluid;an input portion to which a displacement from the actuator is transmitted, having an input side pressure surface facing the hydraulic fluid;a first expandable and contractible member for displaceably supporting the input portion and sealing a gap between the input portion and the vessel;an output portion having an output side pressure surface which faces the hydraulic fluid and have a smaller pressure receiving area than that of the input side pressure surface, the output portion being coupled to the flap; anda second expandable and contractible member for displaceably supporting the output portion and sealing a gap between the output portion and the vessel.