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US 11,674,413 B2Granted
Gas turbine engine with gearbox health features
AssigneeRaytheon Technologies Corporation
InventorsFrederick M. Schwarz, William G. Sheridan
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Abstract
A gas turbine engine according to an exemplary aspect of the present disclosure includes, among other things, a fan and a braking system. The braking system is configured to selectively engage the fan during ground windmilling to apply a first level of braking to slow rotation of the fan. Further, when the rotation of the fan sufficiently slows, the braking system is further configured to apply a second level of braking more restrictive than the first level of braking.
Claims7
A gas turbine engine, comprising:
- a fan;
- and
- a lubrication system configured to pump lubricant into a fan drive gearbox when the fan is windmilling at any rotational speed and direction,
- wherein the lubrication system includes a main pump and a main reservoir fluidly coupled to the main pump,
- wherein, during normal operating conditions, the main pump is configured to pump lubricant from the main reservoir to the fan drive gearbox via a main supply line, and lubricant is able to be returned from the fan drive gearbox to the main reservoir via a main scavenge line,
- wherein the lubrication system further includes a secondary pump and a secondary reservoir fluidly coupled to the secondary pump,
- wherein, when the main pump does not provide adequate lubricant to the fan drive gearbox, the secondary pump is configured to pump lubricant from the secondary reservoir to the fan drive gearbox via a secondary supply line, and lubricant is able to be returned from the fan drive gearbox to the secondary reservoir via a secondary scavenge line,
- wherein the secondary pump has a primary function other than pumping lubricant from the secondary reservoir to the fan drive gearbox,
- wherein the secondary supply and scavenge lines are separate from the main supply and scavenge lines.
6 more elements
Dependencies are inferred from the claim text.