US3880479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency bearings for rotating shaft systems
Assignee: Curtiss Wright Corp
•
Filing: 1973-09-04
•
Granted: 1975-04-29
•
Expires: 1993-09-04
Abstract
Abstract A system and apparatus for controlling excessive vibration of a rotating shaft at critical speed or when a large imbalance suddenly occurs, comprising an emergency bearing having sufficient radial clearance that it does not normally engage the shaft, and located longitudinally at a portion of the shaft which is sensitive to excessive vibration, and where it will raise the critical speed of the shaft system when additional support is added at that position. The bearing is of inexpensive contruction of silver alloy, and of such design that it requires no lubrication during the period when the shaft is passing through the critical speed and the bearing is operative.
Inventors
- 👤 Feo Angelo De
- 👤 Mark R Kulina
- 👤 Earl B Norwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
F; F16; F16C; F16C39/00; F16C39/02; F01; F01D; F01D21/00; F01D21/04; F01D21/045; F16C17/00; F16C17/12; F16C17/20; F16C2360/00; F16C2360/23; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/912; Y10T; Y10T428/00; Y10T428/12; Y10T428/12451; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12896; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
In a rotary shaft system having at least two service bearings, vibration damping means in combination with the shaft system comprising a rotating journal member borne by a portion of the shaft system, and an emergency bearing circumferentially surrounding the journal member, the emergency bearing and its journal member being positioned in the shaft system at an axial location where bending occurs during conditions of extraordinary vibration, the diameters of the journal member and its emergency bearing being selected to provide radial spacing therebetween sufficient to allow normal vibration of the shaft system during acceleration and deceleration without contact between the journal member and the emergency bearing, the radial spacing being such as to provide such contact during conditions of extraordinary vibration and serving to damp such vibration, the journal engaging surface of the emergency bearing being provided with a silver alloy bearing material capable of operating for a limited period against the surface of the journal member without lubrication and without seizing.
Claim 2
Dependent Claim
163 words
In a rotary shaft system having at least two service bearings, vibration damping means in combination with the shaft system comprising a rotating journal member borne by a portion of the shaft system, and an emergency bearing circumferentially surrounding the journal member, the emergency bearing and its journal member being positioned in the shaft system at an axial location where bending occurs during conditions of extraordinary vibration, the diameters of the journal member and its emergency bearing being selected to provide radial spacing therebetween sufficient to allow normal vibration of the shaft system during acceleration and deceleration without contact between the journal member and the emergency bearing, the radial spacing being such as to provide such contact during conditions of extraordinary vibration and serving to damp such vibration, the journal engaging surface of the emergency bearing being provided with a silver alloy bearing material capable of operating for a limited period against the surface of the journal member without lubrication and without seizing.
Claim 3
Dependent Claim
54 words
The combination recited in claim 1, wherein the journal-engaging surface of the emergency beAring is provided with a plurality of recessed reservoirs, the reservoirs being filled with the silver alloy which during periods of operation of the emergency bearing is progressively wiped by the journal member across the journal-engaging surface of the bearing member.
Claim 4
Dependent Claim
54 words
The combination recited in claim 2, wherein the reservoirs are staggered in the direction of rotation and the axial dimension of the reservoirs is at least as great as the axial spacing therebetween so that all portions of the engaging surface of the bearing member are circumferentially in line with some of the reservoirs.
References Cited (Backward Citations)
US1194463A
Cited
US1961134A
Cited
US2241789A
Cited
US2377882A
Cited
US2451907A
Cited
US2961277A
Cited
US3411706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |