US4602873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration-controlling bearing
Assignee: Hitachi Ltd
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Filing: 1984-11-19
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Granted: 1986-07-29
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Expires: 2004-11-19
Abstract
Abstract A vibration-controlling bearing for controlling vibration developing in a rotary shaft supported in a housing of a rotary machine including a bearing member of a cylindrical shape interposed between an outer peripheral surface of the rotary shaft and an inner peripheral surface of the housing and spaced apart therefrom by respective gaps. A dynamic pressure is generated between an inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft. Communicating ducts are formed in the bearing member for transmitting a portion of the dynamic pressure generated to a gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing.
Inventors
- 👤 Hideki Izumi
- 👤 Nobuo Tsumaki
- 👤 Kazuo Ihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:01
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C17/00; F16C17/02; F16C17/028; F16C27/00; F16C27/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
222 words
A vibration-controlling gas bearing for controlling vibration developing in a rotary shaft supported in a housing of a rotary machine, the vibration-controlling gas bearing comprising: a cylindrical bearing member interposed between an outer peripheral surface of the rotary shaft and an inner peripheral surface of the housing and spaced apart therefrom by respective gaps; dynamic pressure generating means provided on an inner peripheral surface of the bearing member for generating dynamic pressure between an inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft; rotation stop means comprising a hole formed in one axial end face of said bearing member, and a pin engaging in said hole and attached to said housing for preventing rotation of the bearing member in such a manner so as to allow the bearing member to be slightly moved in a radial direction; wherein said dynamic pressure generating means comprises at least one bearing member to define a wedge-shaped gap between the inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft; and communicating ducts formed in the bearing member for transmitting a portion of the dynamic pressure generated by the dynamic pressure generating means to a gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing.
Claim 2
Dependent Claim
222 words
A vibration-controlling gas bearing for controlling vibration developing in a rotary shaft supported in a housing of a rotary machine, the vibration-controlling gas bearing comprising: a cylindrical bearing member interposed between an outer peripheral surface of the rotary shaft and an inner peripheral surface of the housing and spaced apart therefrom by respective gaps; dynamic pressure generating means provided on an inner peripheral surface of the bearing member for generating dynamic pressure between an inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft; rotation stop means comprising a hole formed in one axial end face of said bearing member, and a pin engaging in said hole and attached to said housing for preventing rotation of the bearing member in such a manner so as to allow the bearing member to be slightly moved in a radial direction; wherein said dynamic pressure generating means comprises at least one bearing member to define a wedge-shaped gap between the inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft; and communicating ducts formed in the bearing member for transmitting a portion of the dynamic pressure generated by the dynamic pressure generating means to a gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing.
Claim 3
Dependent Claim
220 words
A vibration-controlling bearing capable of controlling vibration developing in a rotary shaft supported in a housing of a rotary machine, comprising: a cylindrical bearing member interposed between an outer peripheral surface of the rotary shaft and an inner surface of the housing and spaced apart therefrom by respective gaps; dynamic pressure generating means mounted on one of an inner peripheral surface of the bearing member and an outer peripheral surface of the rotary shaft for generating dynamic pressure between an inner peripheral surface of the bearing member and an outer peripheral surface of the rotary shaft; communicating ducts formed in the bearing member for transmitting a portion of the dynamic pressure generated by the dynamic pressure generating means to a gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing; rotation stop means comprising a hole formed in one axial end face of said bearing member, and a pin engaging in said hole and attached to said housing for preventing rotation of the bearing member in such a manner so as to allow the bearing member to be slightly moved in a radial direction; and wherein said dynamic pressure generating means comprises grooves formed on the outer peripheral surface of the rotary shaft located in spaced-apart relationship with respect to one another.
Claim 4
Dependent Claim
220 words
A vibration-controlling bearing capable of controlling vibration developing in a rotary shaft supported in a housing of a rotary machine, comprising: a cylindrical bearing member interposed between an outer peripheral surface of the rotary shaft and an inner surface of the housing and spaced apart therefrom by respective gaps; dynamic pressure generating means mounted on one of an inner peripheral surface of the bearing member and an outer peripheral surface of the rotary shaft for generating dynamic pressure between an inner peripheral surface of the bearing member and an outer peripheral surface of the rotary shaft; communicating ducts formed in the bearing member for transmitting a portion of the dynamic pressure generated by the dynamic pressure generating means to a gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing; rotation stop means comprising a hole formed in one axial end face of said bearing member, and a pin engaging in said hole and attached to said housing for preventing rotation of the bearing member in such a manner so as to allow the bearing member to be slightly moved in a radial direction; and wherein said dynamic pressure generating means comprises grooves formed on the outer peripheral surface of the rotary shaft located in spaced-apart relationship with respect to one another.
Claim 5
Dependent Claim
43 words
A vibration-controlling bearing as claimed in claim 2, wherein said grooves comprise spiral grooves located on the outer peripheral surface of said rotary shaft in a symmetrical relationship with respect to a plane extending perpendicular to a center axis of the rotary shaft.
Claim 6
Dependent Claim
43 words
A vibration-controlling bearing as claimed in any one of claims 2 or 3, wherein first ends of each of said communicating ducts opens in the inner peripheral surface of the bearing member at a position in which the dynamic pressure generated is maximized.
Claim 7
Dependent Claim
26 words
A vibration-controlling bearing as claimed in claim 4, wherein said bearing member is located between a horizontally arranged rotary shaft and the housing is juxtaposed theregainst.
Claim 8
Dependent Claim
26 words
A vibration-controlling bearing as claimed in claim 4, wherein said bearing member is located between a vertically disposed rotary shaft and the housing is juxtaposed thereagainst.
Claim 9
Dependent Claim
24 words
A vibration-controlling bearing as claimed in claim 4, wherein said communicating ducts are disposed in a circumferentially spaced relationship with respect to one another.
Claim 10
Dependent Claim
46 words
A vibration-controlling bearing as claimed in claim 4, wherein said communicating ducts are arranged in circumferential rows spaced from each other in an axial direction of the bearing member, and wherein said communicating ducts in each of the circumferential rows are circumferentially spaced from one another.
Claim 11
Dependent Claim
204 words
A vibration-controlling gas bearing for controlling vibration developing in a rotary shaft supported in a housing of the rotary machine, the vibration controlling gas bearing comprising: a cylindrical bearing member interposed between an outer peripheral surface of the rotary shaft and an inner peripheral surface of the housing with gaps being respectively defined between an inner peripheral surface of the bearing member and an outer peripheral surface of the housing and between an outer peripheral surface of the bearing member and an inner peripheral surface of the housing; dynamic pressure generating means provided on the inner peripheral surface of the bearing member for generating dynamaic pressure between the inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft; and a plurality of communicating ducts extending radially through the bearing member, each of said communicating ducts having a first end opening in the inner peripheral surface of the bearing member and a second end opening in the outer peripheral surface of the bearing member for supplying a portion of the dynamic pressure generated by the dynamic pressure generating means into the gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing.
Claim 12
Dependent Claim
204 words
A vibration-controlling gas bearing for controlling vibration developing in a rotary shaft supported in a housing of the rotary machine, the vibration controlling gas bearing comprising: a cylindrical bearing member interposed between an outer peripheral surface of the rotary shaft and an inner peripheral surface of the housing with gaps being respectively defined between an inner peripheral surface of the bearing member and an outer peripheral surface of the housing and between an outer peripheral surface of the bearing member and an inner peripheral surface of the housing; dynamic pressure generating means provided on the inner peripheral surface of the bearing member for generating dynamaic pressure between the inner peripheral surface of the bearing member and the outer peripheral surface of the rotary shaft; and a plurality of communicating ducts extending radially through the bearing member, each of said communicating ducts having a first end opening in the inner peripheral surface of the bearing member and a second end opening in the outer peripheral surface of the bearing member for supplying a portion of the dynamic pressure generated by the dynamic pressure generating means into the gap between the outer peripheral surface of the bearing member and the inner peripheral surface of the housing.
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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |