US4892174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nutation damper for a high-speed spinning body
Assignee: Toshiba Corp
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Filing: 1988-07-21
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Granted: 1990-01-09
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Expires: 2008-07-21
Abstract
Abstract The present invention provides a nutation damper having a hollow ring-shaped container installed concentrically to the axis of spin of a spinning body, with a viscous fluid sealed inside, and partially filling the container so as to leave a gap. The volume of the viscous fluid is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of the container. It can provide a nutation damper of simple construction which can damp nutation arising in high-speed spinning bodies and allow these spinning bodies to spin stably.
Inventors
- 👤 Shigeru Takekado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:25
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/10; F16F15/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
A nutation damper for a high-speed spinning body comprising: a hollow ring-shaped container installed concentrically to the axis of spin of a high-speed spinning body and rotating therewith, and a viscous liquid fluid sealed inside, and partially filling, the container so as to leave a gap, said viscous fluid having a volume which is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of said container, said container containing only said viscous liquid fluid, except for said gap. wherein said viscous fluid has a viscosity of more than or equal to 1.0 cSt with little fluctuation of viscosity with temperature and is one from the group consisting of a silicone oil and a fluorinated oil, whereby a circumferential wave is formed in said viscous fluid during rotation of said spinning body and nutation energy is damped by said centrifugal wave when the centrifugal wave frequency matches the nutation frequency.
Claim 2
Dependent Claim
156 words
A nutation damper for a high-speed spinning body comprising: a hollow ring-shaped container installed concentrically to the axis of spin of a high-speed spinning body and rotating therewith, and a viscous liquid fluid sealed inside, and partially filling, the container so as to leave a gap, said viscous fluid having a volume which is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of said container, said container containing only said viscous liquid fluid, except for said gap. wherein said viscous fluid has a viscosity of more than or equal to 1.0 cSt with little fluctuation of viscosity with temperature and is one from the group consisting of a silicone oil and a fluorinated oil, whereby a circumferential wave is formed in said viscous fluid during rotation of said spinning body and nutation energy is damped by said centrifugal wave when the centrifugal wave frequency matches the nutation frequency.
Claim 3
Dependent Claim
27 words
The nutation damper according to claim 1 wherein said viscous fluid is a silicone oil liquid having a viscosity of more than or equal to 1.0 cSt.
Claim 4
Dependent Claim
15 words
The nutation damper according to claim 2 wherein said silicone oil liquid is methyl silicone.
Claim 5
Dependent Claim
16 words
The nutation damper according to claim 1 wherein said viscous fluid is a fluorinated oil liquid.
Claim 6
Dependent Claim
15 words
A nutation damper according to claim 4 wherein said fluorinated oil liquid is perfluoro polyether.
Claim 7
Dependent Claim
15 words
The nutation damper according to claim 4 wherein said fluorinated oil liquid is perfluoroalkyl polyether.
Claim 8
Dependent Claim
16 words
The nutation damper according to claim 4 wherein said fluorinated oil liquid is ethylene chloride trifluoride.
Claim 9
Dependent Claim
141 words
A nutation damper for a high-speed spinning body comprising: a hollow ring-shaped container installed concentrically to the axis of spin of a high-speed spinning body and rotating therewith, and a viscous liquid fluid sealed inside, and partially filling, the container so as to leave a gap, said viscous fluid having a volume which is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of said container, said container containing only said viscous liquid fluid, except for said gap, wherein said viscous fluid has a viscosity of more than or equal to 5 cSt with little fluctuation of viscosity with temperature, whereby a circumferential wave is formed in said viscous fluid during rotation of said spinning body and nutation energy is damped by said centrifugal wave when the centrifugal wave frequency matches the nutation frequency.
Claim 10
Dependent Claim
141 words
A nutation damper for a high-speed spinning body comprising: a hollow ring-shaped container installed concentrically to the axis of spin of a high-speed spinning body and rotating therewith, and a viscous liquid fluid sealed inside, and partially filling, the container so as to leave a gap, said viscous fluid having a volume which is determined as less than or equal to 1/2 of the volume enclosed by the outer wall of said container, said container containing only said viscous liquid fluid, except for said gap, wherein said viscous fluid has a viscosity of more than or equal to 5 cSt with little fluctuation of viscosity with temperature, whereby a circumferential wave is formed in said viscous fluid during rotation of said spinning body and nutation energy is damped by said centrifugal wave when the centrifugal wave frequency matches the nutation frequency.
Claim 11
Dependent Claim
18 words
The nutation damper of claim 8 wherein said viscous fluid has a viscosity of at least 10 cSt.
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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |