Control device for monocyclic pitch in a fixed reference system

Details Control device for monocyclic pitch in a fixed reference system Control device for monocyclic pitch in a fixed reference system

1989-09-11

1990-08-28

Wayner, William E.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Responsive to fixed actuator

416 98, B63H 300

Patent

active

049521209

ABSTRACT:
The invention relates to a control device for monocyclic pitch in a fixed reference system and multicyclic pitch in a rotating reference system, for the blades (7) of a rotor craft.
In addition to conventional swashplates (27, 38), one (38) of which rotates (39) on the other (27) held in rotation by a nonrotating compass (28), but which slides axially (4) and oscillates (25) about the rotor mast (1), through the action of pilot control (30), it comprises multicyclic jacks (45) in a number equal to the blades (7), and each of which is implanted in the rotating plate (38) and directly drives a pitch control rod (44) of a corresponding blade (7). Each multicyclic jack (45) is a dual-action, hydraulic linear jack controlled by a servovalve (49) also implanted on the rotating plate (38).

REFERENCES:
patent: 2306703 (1942-12-01), Kost
patent: 2427939 (1947-09-01), Avery
patent: 2491260 (1949-12-01), Green
patent: 2703147 (1955-03-01), Peterson
patent: 3102597 (1963-09-01), Drees
patent: 3144903 (1964-08-01), Pascher
patent: 3623682 (1971-11-01), Kretz
patent: 3625632 (1971-12-01), Casterline
Journal of The American Helicopter Society, vol. 27, No. 3, Juillet 1982, . 25-31, New York, US; K. F. Guinn: "Individual Blade Control Independent of a Swashplate".

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