Lubrication of windmilling journal bearings

Planetary gear transmission systems or components – With lubricaton

Reexamination Certificate

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C475S331000, C184S004000, C184S006110, C184S006120, C184S027200

Reexamination Certificate

active

07662059

ABSTRACT:
A support shaft provides lubrication to a journal bearing during windmilling operation of a gear set. A primary oil pump provides oil from an oil supply during driven operation of the fan, and a secondary oil pump provides oil from an internal sump during windmilling operation of the fan. During driven operation of the fan, oil is pumped with the primary oil pump through a primary oil flow path to an outer surface of the support shaft. During windmilling fan operation, oil is pumped from an internal sump with a secondary oil pump through the secondary oil flow path. The secondary oil flow path has a smaller flow capacity, and the secondary oil pump is a smaller capacity pump.

REFERENCES:
patent: 4892011 (1990-01-01), Nishida et al.
patent: 5102379 (1992-04-01), Pagluica et al.
patent: 5433674 (1995-07-01), Sheridan et al.
patent: 6223616 (2001-05-01), Sheridan
patent: 7377870 (2008-05-01), Matsushita et al.
patent: 2006/0223664 (2006-10-01), Duong et al.
patent: 2008/0006018 (2008-01-01), Sheridan et al.
patent: 58008849 (1983-01-01), None
Translation of JP 58008849.

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