US3632222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damping means for differential gas turbine engine
Assignee: Avco Corp
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Filing: 1970-10-21
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Granted: 1972-01-04
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Expires: 1990-10-21
Abstract
Abstract The disclosure illustrates a damping device for a gas turbine engine of the type that has a centrifugal compressor impeller and aft positioned turbine wheel connected by concentric shafts to a forward mounted differential which has an output shaft. The device is positioned on the turbine shaft closely adjacent the differential drive to damp torsional vibrations.
Inventors
- 👤 Val Cronstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:59
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/04; F02; F02C; F02C7/00; F02C7/36; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A gas turbine engine comprising: a housing; a compressor journaled for rotation in said housing; a turbine journaled for rotation in said housing; a differential drive mounted in said housing and having two inputs and an output shaft; first and second shafts respectively connecting said turbine and said compressor to said differential drive; and a vibration damper interposed in said first shaft closely adjacent the differential drive for minimizing interaction of torsional vibrations between said turbine, compressor and gear box.
Claim 2
Dependent Claim
80 words
A gas turbine engine comprising: a housing; a compressor journaled for rotation in said housing; a turbine journaled for rotation in said housing; a differential drive mounted in said housing and having two inputs and an output shaft; first and second shafts respectively connecting said turbine and said compressor to said differential drive; and a vibration damper interposed in said first shaft closely adjacent the differential drive for minimizing interaction of torsional vibrations between said turbine, compressor and gear box.
Claim 3
Dependent Claim
70 words
A gas turbine engine as in claim 1 wherein: said compressor is a centrifugal radial outflow compressor; said differential drive is positioned forward of said compressor and said turbine is positioned aft of said compressor; said first and second shafts are concentric with respect to one another, the first shaft for said turbine extending through the axis of rotation of said compressor and said second shaft to said differential drive.
Claim 4
Dependent Claim
42 words
A gas turbine engine as in claim 2 wherein said damping means comprises a coupling comprising inner and outer rotating members and a plurality of sandwiched leaf springs secured in said inner member and extending generally radially outward to said outer member.
Claim 5
Dependent Claim
117 words
A gas turbine engine as in claim 2 wherein: said differential drive comprises: a sun gear connected to said first shaft and a sun gear connected to said compressor shaft, thereby defining said inputs to said differential drive, said sun gears being axially spaced from one another; a first set of fixed planetary gears meshing with said compressor sun gear; a second set of planetary gears meshing with the sun gear on said turbine shaft and secured to said output shaft; a generally annular ring gear meshing with the first and second sets of planetary gears and extending therebetween; said damping means is positioned on said turbine shaft between said first and second sets of planetary gears.
Claim 6
Dependent Claim
42 words
A gas turbine engine as in claim 4 wherein said damping means comprises a coupling comprising inner and outer rotating members and a plurality of sandwiched leaf springs secured in said inner member and extending generally radially outward to said outer member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |