Patent US4775248A successfully refreshed from Google Patents.
US4775248A
Expired / Lapsed
US
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Multiple feed oil supply system for fluid damper
Assignee: RTX Corp
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Filing: 1987-12-16
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Granted: 1988-10-04
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Expires: 2007-12-16
Abstract
Abstract Structure for preventing cavitation and/or starvation in an oil film squeeze annular damper for dampening the high energy vibrations occasioned by a rotating shaft by including a plurality of judiciously located inlets to the annular damper so as to place in continuous communication the low pressure portion of the annulus with the supply source. Three inlet ports equally spaced about the circumference of the annulus disclose an exemplary supply system wherein each inlet includes a check valve for preventing backflow from the annulus.
Inventors
- 👤 Jack R. Barbic
- 👤 Kurt L. Nichol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:31
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; F16F15/023; F16F15/0237; F16C; F16C27/00; F16C27/04; F16C27/045; F16C2360/00; F16C2360/23
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
A fluid supply system for preventing cavitation and/or starvation of the fluid film in a squeeze film damper, comprising a nonrotating sleeve-like element, mounted about a shaft being supported by bearings, an annular support surrounding said sleeve-like element, a fluid-tight annular volume between said support and sleeve-like element, a vent for porting fluid from said annular volume, the squeeze film damper controlling the transverse orbital movement of the vibration excited from the shaft whereby a high pressure and low pressure wave pattern precesses orbitally within said fluid-tight annular chamber and inlet ports spaced around the circumference of said annular damper to introduce fluid into said annular volume, and fluid connection means interconnecting a source of high pressure fluid to said inlet ports whereby at least one each of said inlet ports are in communication with the low pressure as the pressure pattern precesses around the annular volume.
Claim 2
Dependent Claim
147 words
A fluid supply system for preventing cavitation and/or starvation of the fluid film in a squeeze film damper, comprising a nonrotating sleeve-like element, mounted about a shaft being supported by bearings, an annular support surrounding said sleeve-like element, a fluid-tight annular volume between said support and sleeve-like element, a vent for porting fluid from said annular volume, the squeeze film damper controlling the transverse orbital movement of the vibration excited from the shaft whereby a high pressure and low pressure wave pattern precesses orbitally within said fluid-tight annular chamber and inlet ports spaced around the circumference of said annular damper to introduce fluid into said annular volume, and fluid connection means interconnecting a source of high pressure fluid to said inlet ports whereby at least one each of said inlet ports are in communication with the low pressure as the pressure pattern precesses around the annular volume.
Claim 3
Dependent Claim
23 words
A fluid supply system as in claim 1 including at least three inlet ports equally spaced about the circumference of said annular volume.
Claim 4
Dependent Claim
28 words
A fluid-supply system as in claim 1 including a check valve for each of said inlet ports for preventing the back flow of fluid from said annular volume.
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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |