US3611831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsional vibration damper
Assignee: Physics International Co
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Filing: 1969-12-03
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Granted: 1971-10-12
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Expires: 1989-12-03
Abstract
Abstract Apparatus for damping the torsional oscillations of a rotating shaft, is provided which includes an electromechanical transducer coupled to said shaft for converting a substantial portion of the mechanical energy generated by the torsional oscillations of the shaft to electrical energy which can then be readily dissipated by applying it to load resistors.
Inventors
- 👤 Cormac Garrett O'neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:36
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/10; F16F15/18; F16F15/005; F16F15/14; F16F15/1407; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2121; Y10T74/2127
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
Apparatus for damping the torsional vibration of a rotating shaft comprising piezoelectric means; means mounted on said shaft and rotatable therewith, for applying pressures derived from vibration amplitude to said piezoelectric means whereby said piezoelectric means generates change in response thereto; and means for dissipating the electrical energy generated in said piezoelectric means.
Claim 2
Dependent Claim
53 words
Apparatus for damping the torsional vibration of a rotating shaft comprising piezoelectric means; means mounted on said shaft and rotatable therewith, for applying pressures derived from vibration amplitude to said piezoelectric means whereby said piezoelectric means generates change in response thereto; and means for dissipating the electrical energy generated in said piezoelectric means.
Claim 3
Dependent Claim
73 words
Apparatus for damping the torsional vibrations of a rotating shaft comprising a damper mass; means for rotatably supporting said damper mass at one end of said shaft; piezoelectric means; means coupled to said shaft to be rotatable therewith for applying energy from said shaft to said damper mass through said pIezoelectric means whereby said piezoelectric means generates electrical energy responsive thereto; and means for dissipating the electrical energy generated by said piezoelectric means.
Claim 4
Dependent Claim
73 words
Apparatus for damping the torsional vibrations of a rotating shaft comprising a damper mass; means for rotatably supporting said damper mass at one end of said shaft; piezoelectric means; means coupled to said shaft to be rotatable therewith for applying energy from said shaft to said damper mass through said pIezoelectric means whereby said piezoelectric means generates electrical energy responsive thereto; and means for dissipating the electrical energy generated by said piezoelectric means.
Claim 5
Dependent Claim
77 words
Apparatus as recited in claim 2 wherein said means for applying energy from said shaft to said damper mass through said piezoelectric means comprises radially extending blade means, hub means attached to said shaft and supporting said blade; said damper mass having a radial cavity therein into which said blade means extends; said piezoelectric means being disposed on either side of said blade means between it and the walls of said damper mass which forms said cavity.
Claim 6
Dependent Claim
88 words
Apparatus for damping the torsional vibrations of a rotating shaft comprising a damper mass rotatably mounted on said shaft; and means for applying rotational energy from said shaft to said damper mass including: blade means mounted on said shaft to be rotatably driven thereby, piezoelectric means mounted between said blade means and said rotatable mass for applying rotational energy to said damper mass through said piezoelectric means whereby said piezoelectric means develops voltages in response thereto; and means for dissipating the electrical energy generated by said piezoelectric means.
Claim 7
Dependent Claim
88 words
Apparatus for damping the torsional vibrations of a rotating shaft comprising a damper mass rotatably mounted on said shaft; and means for applying rotational energy from said shaft to said damper mass including: blade means mounted on said shaft to be rotatably driven thereby, piezoelectric means mounted between said blade means and said rotatable mass for applying rotational energy to said damper mass through said piezoelectric means whereby said piezoelectric means develops voltages in response thereto; and means for dissipating the electrical energy generated by said piezoelectric means.
Claim 8
Dependent Claim
27 words
Apparatus as recited in claim 4 wherein said means for dissipating the electrical energy generated by said piezoelectric means includes resistance means connected to said piezoelectric means.
Claim 9
Dependent Claim
47 words
Apparatus as recited in claim 4 wherein said damper mass comprises a cylindrical body having a central cavity through which said rotating shaft extends and at least one radial cavity extending from said central cavity; and means for rotatably mounting said damper mass on said rotating shaft.
Claim 10
Dependent Claim
34 words
Apparatus as recited in claim 6 wherein said blade means extends into said damper mass radial cavity; and said piezoelectric means is between said blade means and walls forming said damper mass radial cavity.
References Cited (Backward Citations)
US2451513A
Cited
US2443471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |