Axially compact ram air turbine

Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Resilient bias or mount

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Details

416135, 416136, 416140, B64C 1128

Patent

active

052579077

ABSTRACT:
An undesirably long axial length of a ram air turbine may be reduced in a construction including a hub (110) mounted for rotation about a rotational axis (112), at least one turbine blade (114) rotatably mounted on the hub (110) for rotation between coarse and fine pitch positions about a blade pitch axis (116) which is different from the rotational axis (112) and a counterweight assembly (120) for each turbine blade (114) and mounted on the hub (110) for rotation between coarse and fine pitch positions about the blade pitch axis (116) in spaced relation to the rotational axis (114) and disposed when rotated about the rotational axis (112) to bias the turbine blade (114) towards its coarse pitch position. A limited lost motion connection (143, 144, 145, 146, 147, 148, 150) is located between the turbine blade (114) and the counterweight assembly (120). The main governor spring (130) biases the counterweight (120) toward a fine pitch position and a spring (142 ) acts across the lost motion connection (143, 144, 145, 146, 147, 148, 150) and biases the blade (114) toward the coarse pitch position.

REFERENCES:
patent: 1833843 (1931-11-01), Leparmentier
patent: 1834351 (1931-12-01), Schroeder
patent: 2504737 (1950-04-01), Sharpes
patent: 2693242 (1954-11-01), Elmer
patent: 2815188 (1957-12-01), Nelson
patent: 2997109 (1961-08-01), Blackburn
patent: 4411596 (1980-03-01), Chilman
patent: 4743163 (1988-05-01), Markunas et al.

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