US4457566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearings
Assignee: BTG International Ltd
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Filing: 1981-06-17
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Granted: 1984-07-03
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Expires: 2001-06-17
Abstract
Abstract A hydrostatic bearing with structural features to improve the harmony between hydrostatic and hydrodynamic forces set up in the bearing fluid, and to diminish the harmful effects of hydrodynamic forces when there is relative motion between the bearing members. These features may comprise channels in the bearing land to maintain transverse hydrostatic fluid flow beneath the land despite longitudinal dynamic forces, longitudinal channels in the bearing surfaces to diminish dynamic friction without unduly diminishing the resistance to hydrostatic fluid flow across these channels and means to guide fluid recirculation within the bearing recess so as to avoid shearing contact between oppositely-moving streams of fluid within it.
Inventors
- 👤 Mohammed E. Mohsin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:35
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0629; F16C32/064; F16C32/0651; F16C32/0659
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
A hydrostatic bearing comprising: first and second relatively moveable bearing members; first and second confronting surfaces presented by said first and second bearing member, respectively; a recess formed in said first member and supplied in use with fluid under hydrostatic pressure, whereby, in use, said surface are separated by a film issuing from said recess; said recess having a mouth defining an opening in said first confronting surface, and guide means co-operating with said recess and lying wholly separated from said first confronting surface so that said guide means is disposed within said recess and on a side of said first confronting surface that is remote from said second confronting surface, whereby circulatory movement of said fluid within said recess due to friction from said second confronting surface is conducted in a manner which avoids substantial direct contact between adjacent streams of said fluid moving in opposite directions within said recess.
Claim 2
Dependent Claim
151 words
A hydrostatic bearing comprising: first and second relatively moveable bearing members; first and second confronting surfaces presented by said first and second bearing member, respectively; a recess formed in said first member and supplied in use with fluid under hydrostatic pressure, whereby, in use, said surface are separated by a film issuing from said recess; said recess having a mouth defining an opening in said first confronting surface, and guide means co-operating with said recess and lying wholly separated from said first confronting surface so that said guide means is disposed within said recess and on a side of said first confronting surface that is remote from said second confronting surface, whereby circulatory movement of said fluid within said recess due to friction from said second confronting surface is conducted in a manner which avoids substantial direct contact between adjacent streams of said fluid moving in opposite directions within said recess.
Claim 3
Dependent Claim
18 words
A hydrostatic bearing according to claim 1 in which said guide means comprise a baffle within said recess.
Claim 4
Dependent Claim
20 words
A hydrostatic bearing according to claim 1 in which said guide means comprise a re-circulation conduit exterior to said recess.
Claim 5
Dependent Claim
26 words
A hydrostatic bearing according to claim 1 in which the structure of said recess is streamlined to match the said circulatory movement within the said recess.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |