Pitch change arrangement for a variable pitch fan

Details Pitch change arrangement for a variable pitch fan Pitch change arrangement for a variable pitch fan

1987-11-12

1989-03-07

Powell, Jr., Everette A.

Rotary kinetic fluid motors or pumps

Runner or blade selectively adjustable relative to casing

416158, B64C 1106, B64C 1138

Patent

active

048101648

ABSTRACT:
A pitch arrangement for a variable pitch fan assembly of a turbofan gas turbine engine comprises a plurality of fan blades, each of which has a root portion rotatably mounted, in a thrust bearing on a fan rotor. A control ring is arranged coaxially with and is rotatably mounted on the fan rotor, and each of the fan blades is connected to the control ring by a lever arm. The pitch of the fan blades is varied by rotation of the control ring in either direction. A plurality of hydraulic rams are arranged to drive the control ring through a plurality of bell cranks. The hydraulic rams are mounted on the fan rotor so that the pistons and shafts move in a radial direction such that the centrifugal force of the pistons and shafts is applied to the bell cranks so that a counter turning movement is applied to the control ring to oppose the centrifugal turning moment of the fan blades.

REFERENCES:
patent: 2113438 (1938-04-01), Allred
patent: 2160553 (1939-05-01), Martinotti
patent: 2307101 (1943-01-01), Blanchard et al.
patent: 3794442 (1974-02-01), McMurtry
patent: 3869221 (1975-03-01), Wildner

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