Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – By actuator eccentric to rotation axis
Patent
1989-09-11
1991-04-30
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
By actuator eccentric to rotation axis
416115, 416156, B63H 300, B64C 1100
Patent
active
050113739
ABSTRACT:
An individual pitch control device for the blades (7) of a rotor of a rotor craft employing respective rotating linear jacks (29) for controlling the pitch of the rotor blades. The linear jacks are implanted in a rotating support (25) which is driven in rotation with the rotor. The jacks (29) include rods (31) which are connected via additional rods (33) to drive pitch control levers (24) for each respective blade. The jacks (29) are linear, electrohydraulic, dual-action jacks having at least one body, and are supplied by control servovalves (36) which are also mounted in a rotating reference system. The servovalves (36) are supplied from a hydraulic circuit in a fixed reference system positioned on the rotor craft, having at least one hydraulic collector (27) which is at least partially rotating.
REFERENCES:
patent: 2151216 (1939-03-01), Larsen
patent: 2812026 (1957-11-01), Braddon
patent: 2988153 (1961-06-01), Haworth et al.
patent: 3303887 (1965-01-01), Pfleiderer
patent: 3603697 (1971-09-01), Lane
patent: 3765794 (1973-10-01), Kudasch et al.
patent: 3960348 (1976-06-01), Fowler et al.
patent: 4379678 (1983-04-01), Carlock et al.
patent: 4854219 (1989-08-01), Hockaday et al.
Journal of the American Hellicopter Society, vol. 27, No. 3, Juillet 1982, pp. 25-31, New York, U.S.; K. F. Guinn; "Individual Blade Control Independent of a Swashplate".
Aubry Jacques A.
Mondet Jean J.
Look Edward K.
Nguyen Hoang
Societe Nationale Industrielle et Aerospatiale
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