Blade pitch locking device for a main rotor of a rotary-wing air

Details Blade pitch locking device for a main rotor of a rotary-wing air Blade pitch locking device for a main rotor of a rotary-wing air

1998-07-02

2000-03-07

Eldred, J. Woodrow

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

244 1727, 244 39, 416142, 416143, B64C 1128

Patent

active

060328991

ABSTRACT:
The present invention relates to a device for locking the pitch of the blades of a main rotor of a rotary-wing aircraft in which each blade is firstly rotated about an axis of rotation of the rotor by a rotor mast and is secondly constrained to pivot about a longitudinal pitch axis of the blade together with a pitch lever which is controlled by a pitch link connected to a rotary plate rotating with the rotor mast and belonging to a cyclic swash plate mechanism in which the rotary plate is rotatably mounted on a non-rotary plate capable of sliding axially along said rotor mast and of tilting in any direction relative to the rotor mast under the drive of at least three servo-controls each comprising a body fixed on a support secured to the aircraft and a rod having a free end secured to the non-rotary plate. The device includes immobilization means for holding the rod of each of the servo-controls relative to the corresponding body so as to lock the blades in a predetermined pitch position.

REFERENCES:
patent: 3765794 (1973-10-01), Kudasch et al.
patent: 3982648 (1976-09-01), Luedtke et al.
patent: 4284387 (1981-08-01), Ferris
patent: 4436483 (1984-03-01), Watson
patent: 5192180 (1993-03-01), Kolleth
patent: 5322415 (1994-06-01), White et al.
U.S application No. 08/953,985, filed Oct. 20, 1997.

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