US3756672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft damping arrangement
Assignee: RTX Corp
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Filing: 1972-05-24
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Granted: 1973-09-04
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Expires: 1992-05-24
Abstract
Abstract Imbalance vibration of each of two concentric rotating shafts is damped simultaneously by a single damped bearing. By supporting one of the shafts on a damped bearing which is fixed to ground, and by transmitting imbalance vibration from the other shaft into the first shaft by means of a nondamped intershaft bearing, the imbalance vibration of both shafts is damped by the single damped bearing.
Inventors
- 👤 D Hibner
- 👤 R Comeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:26
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/16; F01D25/162; F01D25/164; F16; F16C; F16C27/00; F16C27/04; F16C27/045; F16C19/00; F16C19/22; F16C19/24; F16C19/26; F16C2360/00; F16C2360/23
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A bearing and support arrangement for concentric shafts comprising: nonrotating support means; damped bearing means disposed on said support means; first shaft means having at least one span, one end of said span being rotatably disposed on said damped bearing means and being radially supported thereby; second shaft means concentric whith said first shaft means and forming an annular passageway therebetween; and nondamped bearing means disposed on said first shaft span and within said annular passageway, said second shaft means having a span disposed on said nondamped bearing means, and hung from said first shaft span through said nondamped bearing means, said nondamped bearing being adapted to transmit whirling motion of said second shaft span into said first shaft span, said damped bearing means being adapted to damp whirling motion of said first shaft span and of said second shaft span, said damped bearing being the only damped bearing means for damping whirling motion of said spans.
Claim 2
Dependent Claim
157 words
A bearing and support arrangement for concentric shafts comprising: nonrotating support means; damped bearing means disposed on said support means; first shaft means having at least one span, one end of said span being rotatably disposed on said damped bearing means and being radially supported thereby; second shaft means concentric whith said first shaft means and forming an annular passageway therebetween; and nondamped bearing means disposed on said first shaft span and within said annular passageway, said second shaft means having a span disposed on said nondamped bearing means, and hung from said first shaft span through said nondamped bearing means, said nondamped bearing being adapted to transmit whirling motion of said second shaft span into said first shaft span, said damped bearing means being adapted to damp whirling motion of said first shaft span and of said second shaft span, said damped bearing being the only damped bearing means for damping whirling motion of said spans.
Claim 3
Dependent Claim
41 words
The bearing and support arrangement according to claim 1 wherein said damped bearing means is an oil damped bearing means including an annulus of oil, and said end of said first shaft span is fully supported by said annulus of oil.
Claim 4
Dependent Claim
22 words
The bearing and support arrangement according to claim 1 wherein said damped bearing means is axially spaced from said nondamped bearing means.
Claim 5
Dependent Claim
21 words
The bearing and support arrangement according to claim 1 wherein said first and second shaft means are gas turbine engine shafts.
Claim 6
Dependent Claim
35 words
The bearing and support arrangement according to claim 1 wherein said second shaft span has a free end, and is hung at its free end from said first shaft span through said nondamped bearing means.
Claim 7
Dependent Claim
192 words
In an engine including a low rotor shaft and a high rotor shaft, the high rotor shaft being concentric with the low rotor shaft and outwardly spaced therefrom forming an annular passageway therebetween, the high rotor shaft having a span with a free end and the low rotor shaft having at least one span, a bearing and support arrangement for the low and high rotor shafts comprising: nonrotating support means; damped bearing means disposed on said support means, the end of the low rotor span being rotatably disposed on said damped bearing means; nondamped bearing means positioned within the annular passageway, said low rotor span being rotatablY disposed on said nondamped bearing means, and the free end of the high rotor span being rotatably disposed on said nondamped bearing means and hung from said low rotor span therethrough, said nondamped bearing means adapted to transmit whirling motion of said high rotor span into said low rotor span, said damped bearing means adapted to damp whirling motion of said high and low rotor spans, and said damped bearing means being the only damped bearing means for damping the whirling motion of both spans.
Claim 8
Dependent Claim
192 words
In an engine including a low rotor shaft and a high rotor shaft, the high rotor shaft being concentric with the low rotor shaft and outwardly spaced therefrom forming an annular passageway therebetween, the high rotor shaft having a span with a free end and the low rotor shaft having at least one span, a bearing and support arrangement for the low and high rotor shafts comprising: nonrotating support means; damped bearing means disposed on said support means, the end of the low rotor span being rotatably disposed on said damped bearing means; nondamped bearing means positioned within the annular passageway, said low rotor span being rotatablY disposed on said nondamped bearing means, and the free end of the high rotor span being rotatably disposed on said nondamped bearing means and hung from said low rotor span therethrough, said nondamped bearing means adapted to transmit whirling motion of said high rotor span into said low rotor span, said damped bearing means adapted to damp whirling motion of said high and low rotor spans, and said damped bearing means being the only damped bearing means for damping the whirling motion of both spans.
Claim 9
Dependent Claim
41 words
The bearing and support arrangement according to claim 6 wherein said damped bearing means is an oil damped bearing means including an annulus of oil, and said end of said low rotor span is fully supported by said annulus of oil.
Claim 10
Dependent Claim
62 words
The bearing and support arrangement according to claim 6 wherein said low rotor shaft has a critical speed within its operating range and said high rotor shaft has a critical speed within its operating range, and said damped bearing means is the only damped bearing means for damping the whirling motion of said high and low rotor spans at said critical speeds.
Claim 11
Dependent Claim
192 words
In an engine including a low rotor shaft and a high rotor shaft, the high rotor shaft being concentric with the low rotor shaft and outwardly spaced therefrom forming an annular passageway therebetween, the low rotor shaft having a span with a free end and the high rotor shaft having at least one span, a bearing and support arrangement for the low and high rotor shafts comprising: nonrotating support means; damped bearing means disposed on said support means, the end of the high rotor span being rotatably disposed on said damped bearing means; nondamped bearing means positioned within the annular passageway, said high rotor span being rotatably disposed on said nondamped bearing means, and the free end of the low rotor span being rotatably disposed on said nondamped bearing means and hung from said high rotor span therethrough, said nondamped bearing means adapted to transmit whirling motion of said low rotor span into said high rotor span, said damped bearing means adapted to damp whirling motion of said high and low rotor spans, and said damped bearing means being the only damped bearing means for damping the whirling motion of both spans.
Claim 12
Dependent Claim
192 words
In an engine including a low rotor shaft and a high rotor shaft, the high rotor shaft being concentric with the low rotor shaft and outwardly spaced therefrom forming an annular passageway therebetween, the low rotor shaft having a span with a free end and the high rotor shaft having at least one span, a bearing and support arrangement for the low and high rotor shafts comprising: nonrotating support means; damped bearing means disposed on said support means, the end of the high rotor span being rotatably disposed on said damped bearing means; nondamped bearing means positioned within the annular passageway, said high rotor span being rotatably disposed on said nondamped bearing means, and the free end of the low rotor span being rotatably disposed on said nondamped bearing means and hung from said high rotor span therethrough, said nondamped bearing means adapted to transmit whirling motion of said low rotor span into said high rotor span, said damped bearing means adapted to damp whirling motion of said high and low rotor spans, and said damped bearing means being the only damped bearing means for damping the whirling motion of both spans.
Claim 13
Dependent Claim
41 words
The bearing and support arrangement according to claim 9 wherein said damped bearing means is an oil damped bearing means including an annulus of oil, and said end of said high rotor span is fully supported by said annulus of oil.
Claim 14
Dependent Claim
62 words
The bearing and support arrangement according to claim 9 wherein said low rotor shaft has a critical speed within its operating range and said high rotor shaft has a critical speed within its operating range, and said damped bearing means is the only damped bearing means for damping the whirling motion of said high and low rotor spans at said critical speeds.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |