Method and apparatus for deploying ram air turbine and lubricati

Details Method and apparatus for deploying ram air turbine and lubricati Method and apparatus for deploying ram air turbine and lubricati

1991-02-06

1992-12-29

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Working member foldable, pivotable or collapsible to non-use...

416170R, 416174, 60698, 184 611, 244 58, B64C 1128

Patent

active

051747197

ABSTRACT:
Drag produced by cold, viscous oil, interacting with the gear meshes of a gear drive (8) connected to a ram air turbine (2) of an aircraft (1), is controlled to allow proper start-up of the ram air turbine. The lubricating oil is isolated from the gear meshes in remote sumps (11, 12) when the turbine is located in the stowed, inoperative position. An oil metering orifice controls the oil flow from the remote sumps to gearbox sumps with movement of the turbine from the stowed position (A) to the deployed position (B), so as to delay the application of cold, viscous coil to the gear meshes until after start-up of the turbine. This avoids excessive start times and failure to start from the high drag caused by cold, viscous oil on the gear meshes.

REFERENCES:
patent: 3810528 (1974-05-01), Morley et al.
patent: 4676458 (1987-06-01), Cohen
patent: 4683985 (1987-08-01), Hultgren
patent: 4717095 (1988-01-01), Cohen et al.
patent: 4742976 (1988-05-01), Cohen
patent: 4856273 (1989-08-01), Murray
patent: 4858426 (1989-08-01), Holcomb
patent: 4991796 (1991-02-01), Peters et al.

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