Hydraulic device for individual control of pitch of a rotor blad

Details Hydraulic device for individual control of pitch of a rotor blad Hydraulic device for individual control of pitch of a rotor blad

1988-12-15

1990-08-07

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Motor bodily rotatable with impeller hub or shaft

416157A, B64C 2772

Patent

active

049463543

ABSTRACT:
A hydraulic device for the individual control of the pitch of a helicopter rotor blade by a rotary hydraulic jack, the stator vanes of which are integral with a sleeve fitted on the hub. The jack rotor carries rotor vanes movable relative to the stator vanes and delimiting with these chambers of variable volume fed by a servo-distributor controlled as a function of pilot signals and signals from a detector of the angular position of the blade about its pitch axis. The jack is integrated in a pitch bearing and in an elastic ball joint integrated in a rotary hydroelastic shock absorber with vanes for lamination of a viscous fluid. The shock-absorber rotor is connected rigidly in terms of rotation about the pitch axis to the rotor of the jack and is connected to the blade by a rigid cuff.

REFERENCES:
patent: 2151216 (1939-03-01), Larsen
patent: 2427939 (1947-09-01), Woods
patent: 2593335 (1952-04-01), Neale
patent: 2606621 (1952-08-01), Neale
patent: 2703147 (1955-03-01), Peterson
patent: 3119454 (1964-01-01), Leoni
patent: 3276332 (1966-10-01), Jaffe
patent: 3292710 (1966-12-01), Grut
patent: 4379678 (1983-04-01), Carlock et al.
patent: 4534704 (1985-08-01), McArdle
patent: 4815937 (1989-03-01), Aubry et al.

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