Blade pitch change mechanism

Details Blade pitch change mechanism Blade pitch change mechanism

1995-04-14

1995-12-26

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

416151, B63H 300

Patent

active

054782031

ABSTRACT:
A pitch change mechanism for a plurality of fan blades (12) comprises adjustment device (60) to rotate the blades (12) about their longitudinal axes. A gear box (34) provides rotary power to drive the adjustment device (60) in response to a control signal. The gear box (34) is mounted in the fan shaft (30) and rotates therewith. An input shaft (33) to the gear box (34) is mechanically connected to a turbine shaft (32) so that the input shaft (33) rotates with the turbine shaft (32). The difference between the speeds of the fan shaft (30) and the turbine shaft (32) is used to drive an output shaft (39) of the gear box (34). The rotary power of the output shaft (34) drives the pitch adjustment device (60) via a plurality of gears (50).

REFERENCES:
patent: 3459267 (1969-08-01), Chilman
patent: 4578019 (1986-03-01), Safarik
patent: 4692093 (1987-09-01), Safarik
patent: 4878809 (1989-11-01), Ames
patent: 4890979 (1990-01-01), Ames et al.
patent: 5090869 (1992-02-01), Wright
patent: 5174716 (1992-12-01), Hora et al.
patent: 5205712 (1993-04-01), Hamilton
patent: 5242265 (1993-09-01), Hora et al.
patent: 5281095 (1994-01-01), Komura et al.

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