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Gas turbine engine with clutch system between low-pressure compressor and low-pressure turbine
US12467412B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12467412-B2 |
| Application number | US-202318299754-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 13, 2023 |
| Priority date | Jan 28, 2020 |
| Publication date | Nov 11, 2025 |
| Grant date | Nov 11, 2025 |
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- Title
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Abstract
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A gas turbine engine having: an engine core having, in serial flow communication, a low-pressure compressor, a high-pressure compressor, a high-pressure turbine drivingly connected to the high-pressure compressor, and a low-pressure turbine drivingly connected to an output shaft; and a clutch having a disengaged configuration in which the low-pressure turbine is drivingly disconnected from the low-pressure compressor such that, in the disengaged configuration, the clutch disengages the low-pressure turbine from the low-pressure compressor, and an engaged configuration in which the low-pressure turbine is drivingly connected to the low-pressure compressor, the low-pressure turbine drivingly connected to the output shaft in both of the engaged and disengaged configurations of the clutch.
First claim
Opening claim text (preview).
The invention claimed is: 1 . A method for a gas turbine engine having a low-pressure compressor, a high-pressure compressor, a high-pressure turbine drivingly engaging the high-pressure compressor, and a low-pressure turbine drivingly connected to an output shaft, the gas turbine engine having an accessory gearbox drivingly engaged to the high-pressure turbine, the method comprising: receiving a power request; setting the gas turbine engine in a free-turbine configuration by: disengaging the low-pressure compressor from the low-pressure turbine with a first clutch configured in a disengaged configuration if the power request is below a power threshold while keeping the low-pressure turbine drivingly connected to the output shaft, and while-keeping the accessory gearbox drivingly engaged to the high-pressure turbine, and drivingly engaging the low-pressure compressor to the high-pressure compressor with a second clutch configured in an engaged configuration if the power request is below the power threshold; setting the gas turbine engine in a boosted configuration by engaging the low-pressure compressor to the low-pressure turbine with the first clutch configured in an engaged configuration if the power request is above the power threshold while keeping the low-pressure turbine drivingly connected to the output shaft, and while keeping the accessory gearbox drivingly engaged to the high-pressure turbine. 2 . The method of claim 1 , wherein the gas turbine engine has a low-pressure shaft for drivingly engaging the low-pressure turbine to the low-pressure compressor, the first clutch operatively connected to the low-pressure shaft. 3 . The method of claim 1 , wherein drivingly engaging the low-pressure compressor to the high-pressure compressor includes setting the second clutch in the engaged configuration, the second clutch operatively connected to a high-pressure shaft drivingly engaging the high-pressure compressor to the high-pressure turbine. 4 . The method of claim 1 , wherein setting the gas turbine engine in the free-turbine configuration includes drivingly disengaging the low-pressure compressor from both of the low-pressure turbine and the high-pressure compressor. 5 . The method of claim 1 , comprising selectively setting the gas turbine engine in a single-spool configuration in which the low-pressure compressor, the low-pressure turbine, the high-pressure compressor and the high-pressure turbine are all drivingly connected to one another. 6 . The method of claim 5 , wherein in the single-spool configuration, the low-pressure compressor, the low-pressure turbine, the high-pressure compressor and the high-pressure turbine rotate at the same rotational speed. 7 . The method of claim 1 , wherein the gas turbine engine has a propeller, and wherein setting the gas turbine engine in the free-turbine configuration is done based on the power request and the rotational speed of the propeller.
Assignees
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Classifications
Spool rotational speed · CPC title
as in toothed gearing · CPC title
Shafts · CPC title
Maintenance · CPC title
in helicopters · CPC title
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- What does patent US12467412B2 cover?
- A gas turbine engine having: an engine core having, in serial flow communication, a low-pressure compressor, a high-pressure compressor, a high-pressure turbine drivingly connected to the high-pressure compressor, and a low-pressure turbine drivingly connected to an output shaft; and a clutch having a disengaged configuration in which the low-pressure turbine is drivingly disconnected from the …
- Who is the assignee on this patent?
- Pratt & Whitney Canada
- What technology area does this patent fall under?
- Primary CPC classification F02C3/107. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Nov 11 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).