Pitch change control system

Details Pitch change control system Pitch change control system

1990-10-18

1992-08-25

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Motor bodily rotatable with impeller hub or shaft

416165, B64C 1138

Patent

active

051413990

ABSTRACT:
A pitch change actuation system is disclosed for adjusting the pitch of a variable pitch propeller blade (20) rotatably mounted to a hub (10) of the propeller. The pitch change actuator comprises a blade actuation piston (30) operatively connected to the propeller blade (20), a pitchlock piston (50) having a longitudinally directed annular shaft (56) extending therefrom about the shaft (34) of the blade actuation piston (30), pitchlock assembly (130, 140, 150) operatively interconnected between the pitchlock piston (50) and the blade actuation piston (30) for restraining inadvertent blade pitch reduction, bias spring (60) for exerting a preload force against the pitchlock piston (50), and fluid supply conduit (70) operatively interconnected in fluid communication between control valve (100) and the pitch change actuator.

REFERENCES:
patent: 2501720 (1950-03-01), Godden et al.
patent: 3171494 (1965-03-01), Liaaen
patent: 4365937 (1982-12-01), Hiebert et al.

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