Oil system for gas turbine engine
AssigneeGeneral Motors Corporation
InventorDavid S. Huelster
Life of this patent
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Abstract
An oil system for a gas turbine engine including a supply circuit having a main pump supplied from a reservoir tank and discharging in bearing sumps of the engine, a scavenge circuit having a plurality of scavenge pumps supplied from the sumps of the engine and discharging back to the reservoir tank, and a distributing valve in the supply and the scavenge circuits operative when main pump discharge pressure is below a threshold pressure characteristic of main pump interruption to connect the scavenge pump discharge to the supply circuit so that residence oil in the supply circuit is recirculated to maintain bearing lubrication after main pump interruption.
Claims4
A gas turbine engine oil system comprising:
- a supply circuit including a reservoir and an engine driven main pump having an inlet connected to said reservoir and a discharge connected to a nozzle in a sump of said gas turbine engine,
- said supply circuit having a volume of residence oil between said main pump discharge and said nozzle when said main pump is operating,
- a scavenge circuit including an engine driven scavenge pump having an inlet connected to said sump and a discharge connected to said reservoir, and
- a distributor valve disposed in said supply circuit and in said scavenge circuit operative in response to oil pressure between said main pump discharge and said nozzle below a predetermined threshold magnitude to disconnect said main pump discharge from said supply circuit and to connect said scavenge pump discharge to said supply circuit whereby said residence volume of oil in said supply circuit is recirculated from said sump to said nozzle by said scavenge pump.
Dependencies are inferred from the claim text.