USRE31394E - Flexible damped bearing assembly - Google Patents
Flexible damped bearing assembly Download PDFInfo
- Publication number
- USRE31394E USRE31394E US06/184,433 US18443380A USRE31394E US RE31394 E USRE31394 E US RE31394E US 18443380 A US18443380 A US 18443380A US RE31394 E USRE31394 E US RE31394E
- Authority
- US
- United States
- Prior art keywords
- movable member
- seals
- bearing
- damping
- bolting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/03—Sliding-contact bearings for exclusively rotary movement for radial load only with tiltably-supported segments, e.g. Michell bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/02—Sliding-contact bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
Definitions
- This invention relates to a flexible damped bearing and, in particular, to a sealing arrangement for maintaining a high pressure squeeze film acting between a movable bearing support and a stationary component.
- a flexible damped bearing wherein the bearing is housed within a movable member and the member suspended from a stationary frame upon circumferentially spaced flexure springs.
- the springs are tuned to provide the bearing assembly with a predetermined mechanical stiffness capable of attenuating the harmful effects of shaft vibrations.
- a fluid squeeze film is formed about the movable member which acts against the stationary frame and thus serves to dampen the bearing's reaction to shaft induced vibrations.
- seals are maintained within the damping cavity to contain the high pressure damping fluid therein.
- the seals are adapted to ride against the side walls of the cavity and thus add friction or coulomb damping to the system. Because two separate and distinct damping mechanisms are involved, the design of the damping system, particularly where the bearing must react in a prescribed manner over a wide range of frequencies, becomes relatively complex. Furthermore, when this type of mechanical or friction damping is present, the seals become worn with usage thus producing an unwanted change in the damping characteristics of the system.
- a further object of the present invention is to provide a sealing arrangement for use in a flexible damped bearing which will not interact with the damping of the fluid damping film.
- a bearing assembly having a movable member for supporting a shaft bearing, resilient springs for suspending the movable member from a stationary frame, a film cavity containing high pressure fluids being adapted to act between the movable member and the stationary frame, and seals for preventing the high pressure fluid from escaping from the cavity, the seals being positioned outside of the cavity and disposed in sealing relationship with the movable member within a region wherein the seals do not interact with the damping provided by the high pressure fluid.
- a flexible damped bearing assembly 10 embodying the teachings of the present invention, which is arranged to support a shaft 11 of a rotary machine within an opening 12 formed in the end wall 13 thereof.
- the rotary machine can take any form, such as a turbine or a compressor, having its rotary components mounted upon a generally horizontally extended shaft or any other arrangement where the rotor is capable of exerting a relatively high static load upon the bearing.
- the bearing assembly includes .[.an outer.]. .Iadd.a .Iaddend.stationary .[.housing.].
- .Iadd.frame .Iaddend.15 having an annular opening centrally located therein in which is carried a cylindrical movable member 16.
- .Iadd.Stationary frame 15 includes outer housing 17 and bolting ring 26, which is contiguous to and separable from the outer housing.
- .Iaddend.A series of tilt shoe bearings 20 are movably mounted upon rocker pads (not shown) within the movable member and the shaft journaled for rotation within the tilt shoes.
- rocker pads not shown
- a tilt shoe bearing is employed in the preferred embodiment of the present invention, it should be understood that any suitable bearing can be similarly employed herein with out departing from the teachings of the present invention.
- a pair of end covers 22, 23 are affixed to the movable member, the inner surfaces of which are arranged to enclose the tilt shoe and rocker pads in assembly.
- the movable member 16 is resiliently supported within the bearing housing upon a series of axially extended flexure springs 25 equally spaced about the body of the member.
- the springs 25 terminate in a bolting ring 26 that is secured to the left-hand end face of the housing, as seen in .[.FIG. 1,.]. .Iadd.the drawing, .Iaddend.by means of bolts 27, or the like.
- bolting ring 26 is axially forward of movable member 16
- outer housing 17 defines a first bolting surface 18 axially forward of the movable member
- bolting ring 26 defines a second bolting surface 19 axially forward of the movable member and contiguous to first bolting surface 18.
- first bolting surface 18 defines a first radial plane
- second bolting surface 19 defines a second radial plane axially forward of the first radial plane.
- a uniform annular squeeze film cavity 30 is established between the outer periphery of the moving member 16 and the interior wall of the opening contained within the .Iadd.stationary frame 15, specifically outer .Iaddend.housing .[.15.]. .Iadd.17 thereof.Iaddend..
- Fluid under a pressure which is high enough to prevent rupturing of the squeeze film due to the velocity-dependent dynamic forces produced during machine operations, is delivered into the cavity via an annular chamber 32 formed within the stationary housing.
- the high pressure fluid is bled from the cavity by metering ports 35 and passed into the tilt shoe region where it is further utilized to create a hydrodynamic wedge between the shoes and the shaft.
- a pair of O-rings 37, 38 are provided which are located outside of the squeeze film cavity.
- the seals are arranged to be carried within annular grooves machined or otherwise formed in two opposed radially extended side walls of the bearing housing.
- a pair of radially extended flanges 41, 40, carried upon the movable member 16, overlie the side walls of the bearing housing and act against the O-rings to establish a fluid-tight seal therebetween.
- the compressive sealing force of each seal is exerted generally perpendicular to the direction of movement of member 16 and thus has little effect upon the horizontal damping forces involved.
- the seals may be constructed of a material having a relatively low surface tension, such as Teflon, thus minimizing the amount of friction development between the seal and the radially extended flanges.
- At least one helper spring 45 is provided within the bearing assembly that is arranged to support the static or dead weight of the rotor. As illustrated, the spring is carried in an axially elongated groove 42 formed in the inner wall of the bearing housing opening.
- the spring is preloaded in assembly to deliver a biasing force, acting between the stationary housing and the movable member, which supports the static weight of the rotor acting upon the bearing.
- the flexure springs 25 are prevented from being preloaded or initially deformed in assembly. As a result, the uniform integrity of the squeeze film cavity is preserved, allowing the bearing to react in a predictable manner.
Abstract
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/184,433 USRE31394E (en) | 1975-10-03 | 1980-09-04 | Flexible damped bearing assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/619,323 US4025130A (en) | 1975-10-03 | 1975-10-03 | Flexible damped bearing assembly |
US06/184,433 USRE31394E (en) | 1975-10-03 | 1980-09-04 | Flexible damped bearing assembly |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US05/619,323 Reissue US4025130A (en) | 1975-10-03 | 1975-10-03 | Flexible damped bearing assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE31394E true USRE31394E (en) | 1983-09-27 |
Family
ID=26880128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/184,433 Expired - Lifetime USRE31394E (en) | 1975-10-03 | 1980-09-04 | Flexible damped bearing assembly |
Country Status (1)
Country | Link |
---|---|
US (1) | USRE31394E (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19613471A1 (en) * | 1996-04-04 | 1997-10-09 | Asea Brown Boveri | Bearing support for high-speed rotors |
US20070248293A1 (en) * | 2005-09-28 | 2007-10-25 | Pettinato Brian C | Bearing assembly and centering support structure therefor |
US20090052819A1 (en) * | 2004-09-01 | 2009-02-26 | Siemens Aktiengesellschaft | Spindle bearing device and corresponding bearing method |
US20120141056A1 (en) * | 2010-11-23 | 2012-06-07 | Lufkin Industries, Inc. | Bridge Spring Centering Device for Squeeze Film Dampers |
US10883383B1 (en) | 2019-07-26 | 2021-01-05 | Pratt & Whitney Canada Corp. | Multi-film damper rings with spacers |
US10947863B2 (en) | 2019-07-26 | 2021-03-16 | Pratt & Whitney Canada Corp. | Method to supply oil to a multi-film damper |
US10954817B2 (en) | 2019-07-26 | 2021-03-23 | Pratt & Whitney Canada Corp. | Method of separating and sealing multi film damper rings |
US11441605B1 (en) | 2021-03-01 | 2022-09-13 | Pratt & Whitney Canada Corp. | Dual-film damper |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3456992A (en) * | 1967-04-07 | 1969-07-22 | Curtiss Wright Corp | Vibration damping device |
US3499691A (en) * | 1967-12-22 | 1970-03-10 | Boeing Co | Combination damped shaft support |
US3652139A (en) * | 1970-05-27 | 1972-03-28 | United Aircraft Corp | Vibration damping apparatus |
JPS4875022A (en) * | 1971-12-30 | 1973-10-09 |
-
1980
- 1980-09-04 US US06/184,433 patent/USRE31394E/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3456992A (en) * | 1967-04-07 | 1969-07-22 | Curtiss Wright Corp | Vibration damping device |
US3499691A (en) * | 1967-12-22 | 1970-03-10 | Boeing Co | Combination damped shaft support |
US3652139A (en) * | 1970-05-27 | 1972-03-28 | United Aircraft Corp | Vibration damping apparatus |
JPS4875022A (en) * | 1971-12-30 | 1973-10-09 |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5803612A (en) * | 1996-04-04 | 1998-09-08 | Asea Brown Boveri Ag | Bearing support arrangement for rapidly rotating rotors |
DE19613471A1 (en) * | 1996-04-04 | 1997-10-09 | Asea Brown Boveri | Bearing support for high-speed rotors |
US7654746B2 (en) * | 2004-09-01 | 2010-02-02 | Siemens Aktiengesellschaft | Spindle bearing device and corresponding bearing method |
US20090052819A1 (en) * | 2004-09-01 | 2009-02-26 | Siemens Aktiengesellschaft | Spindle bearing device and corresponding bearing method |
US20100037462A1 (en) * | 2005-09-28 | 2010-02-18 | Elliott Company | Method of positioning a bearing assembly and centering support structure therefor |
US7625121B2 (en) | 2005-09-28 | 2009-12-01 | Elliott Company | Bearing assembly and centering support structure therefor |
US20070248293A1 (en) * | 2005-09-28 | 2007-10-25 | Pettinato Brian C | Bearing assembly and centering support structure therefor |
US8726503B2 (en) | 2005-09-28 | 2014-05-20 | Elliott Company | Method of positioning a bearing assembly and centering support structure therefor |
US20120141056A1 (en) * | 2010-11-23 | 2012-06-07 | Lufkin Industries, Inc. | Bridge Spring Centering Device for Squeeze Film Dampers |
US8894286B2 (en) * | 2010-11-23 | 2014-11-25 | Lufkin Industries, Llc | Bridge spring centering device for squeeze film dampers |
US10883383B1 (en) | 2019-07-26 | 2021-01-05 | Pratt & Whitney Canada Corp. | Multi-film damper rings with spacers |
US10947863B2 (en) | 2019-07-26 | 2021-03-16 | Pratt & Whitney Canada Corp. | Method to supply oil to a multi-film damper |
US10954817B2 (en) | 2019-07-26 | 2021-03-23 | Pratt & Whitney Canada Corp. | Method of separating and sealing multi film damper rings |
US11441605B1 (en) | 2021-03-01 | 2022-09-13 | Pratt & Whitney Canada Corp. | Dual-film damper |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ELLIOTT TURBOMACHINERY CO., INC., A CORP OF DELAWA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED.;ASSIGNOR:CARRIER CORPORATION, A CORP OF DEL.;REEL/FRAME:004499/0922 Effective date: 19851220 |
|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF CHICAGO, THE, ONE FIRST NAT Free format text: LICENSE;ASSIGNOR:ELLIOT TURBOMACHINERY CO., INC.;REEL/FRAME:004940/0562 Effective date: 19871109 |
|
AS | Assignment |
Owner name: CONTINENTAL BANK N.A. Free format text: SECURITY INTEREST;ASSIGNOR:ELLIOTT TURBOMACHINERY CO., INC.;REEL/FRAME:005258/0092 Effective date: 19891212 |
|
AS | Assignment |
Owner name: BANK OF NEW YORK, THE, NEW YORK Free format text: ASSIGNMENT OF SECURITY AGREEMENT;ASSIGNOR:BANK OF AMERICA ILLINOIS (F/K/A CONTINENTAL BANK N.A.);REEL/FRAME:008246/0539 Effective date: 19961016 |