Windmill and zero gravity lubrication system for a gas turbine engine
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United States of America Patent
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Jul 31, 2012
Grant Date -
Nov 25, 2010
app pub date -
May 22, 2009
filing date -
May 22, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A pump system for lubricating a bearing in a gear system of a gas turbine engine includes a main pump, an auxiliary pump, an auxiliary reservoir, a sump, and a valve system. The main pump is fluidically connected to the bearing through a main supply passage. The auxiliary pump is fluidically connected to the bearing through an auxiliary supply passage. The valve system transfers lubricating liquid from the main pump to the bearing under a first set of engine operating conditions. The valve system transfers lubricating liquid from the auxiliary reservoir to the sump and from the sump through the auxiliary pump to the bearing under a second set of engine operating conditions. The valve system transfers lubricating liquid from the auxiliary reservoir through the auxiliary pump, bypassing the sump, to the bearing under a third set of engine operating conditions.
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