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US 11,203,974 B2Granted
Auxiliary oil system for geared gas turbine engine
AssigneeRaytheon Technologies Corporation
InventorWilliam G. Sheridan
Life of this patent
Estimating the term…
Abstract
A gas turbine engine comprises a fan drive turbine, a fan rotor, and a gear reduction driven by the fan drive turbine to, in turn, drive the gear architecture. A main oil supply system supplies oil to components within the gear reduction, and an auxiliary oil supply system. The auxiliary oil system operates to ensure that the gear reduction will be adequately supplied with lubricant for at least 30 seconds at power should the main oil supply system fail.
Claims20
A gas turbine engine comprising:
- a fan drive turbine, a fan rotor, and a gear reduction driven by said fan drive turbine to, in turn, drive said gear reduction, a main oil supply system for supplying oil to components within said gear reduction, and an auxiliary oil system;
- said gear reduction includes a sun gear being driven by said fan drive turbine to drive intermediate gears that engage a ring gear;
- said auxiliary oil system being operable to ensure that the gear reduction will be adequately supplied with lubricant for at least 30 seconds at power should the main oil supply system fail;
- said auxiliary oil system being operable to allow the engine to operate under windmill conditions in the aft for up to 90 minutes;
- said auxiliary oil system being operable to operate indefinitely on the ground when windmilling with wind speeds below 85 mph;
- and
- said auxiliary oil system being operable to fly with the engine in an aircraft under negative gravity conditions for at least 20 seconds.
4 more elements
A gas turbine engine comprising:
- a fan drive turbine, a fan rotor, and a gear reduction driven by said fan drive turbine to, in turn, drive said gear reduction, a main oil supply system for supplying oil to components within said gear reduction, and an auxiliary oil system;
- said gear reduction includes a sun gear being driven by said fan drive turbine to drive intermediate gears that engage a ring gear;
- said auxiliary oil system being operable to ensure that the gear reduction will be adequately supplied with lubricant for at least 30 seconds at power should the main oil supply system fail;
- said sun gear, said intermediate gears and said ring gear are enclosed in a bearing compartment, which captures oil removed via a scavenge line connected to a main oil pump;
- said main oil pump has a main scavenge pump that directs scavenged oil to a main oil tank;
- and
- an auxiliary pump draws oil from the bottom of an oil sump and said bottom of said oil sump is at lower elevation than a scavenge line leading from said oil sump to said main scavenge pump.
4 more elements
Dependencies are inferred from the claim text.