US3767277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearings
Assignee: Evanswoods Ltd
•
Filing: 1972-01-31
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Granted: 1973-10-23
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Expires: 1992-01-31
Abstract
Abstract The specification discloses a hydrostatic bearing in which the channels for the passage of the lubricating fluid are defined between a pair of surfaces clamped together, at least one of the surfaces having been roughened as a result of treatment with a high velocity stream of abrasive particles. A linear, thrust and radial bearing are described.
Inventors
- 👤 G Woolcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:11
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0603; F16C32/0614; F16C32/0625
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
191 words
A hydrostatic bearing comprising a body having a bearing surface and a member mounted by the bearing for movement relative to the bearing surface and in which the member is supported in relation to the bearing surface by a thin film of bearing fluid which is supplied under pressure to a space between the member and the bearing surface so that the member is supported by the fluid film at all times whilst bearing fluid is supplied under said pressure to the bearing, including the improvement wherein the body is formed with channels for the passage of bearing fluid, said channels extending to said space between the member and the bearing surface and are defined between a pair of complementary surfaces on first and second body parts maintained in fixed relationship to each other, said first and second body parts being impervious to the passage of bearing fluid, and at least one of which surfaces is roughened to provide a plurality of evenly and randomly distributed pits, substantially all of said pits being interconnected to adjacent pits to permit flow of bearing fluid therebetween, saids pits constituting said bearing fluid channels.
Claim 2
Dependent Claim
191 words
A hydrostatic bearing comprising a body having a bearing surface and a member mounted by the bearing for movement relative to the bearing surface and in which the member is supported in relation to the bearing surface by a thin film of bearing fluid which is supplied under pressure to a space between the member and the bearing surface so that the member is supported by the fluid film at all times whilst bearing fluid is supplied under said pressure to the bearing, including the improvement wherein the body is formed with channels for the passage of bearing fluid, said channels extending to said space between the member and the bearing surface and are defined between a pair of complementary surfaces on first and second body parts maintained in fixed relationship to each other, said first and second body parts being impervious to the passage of bearing fluid, and at least one of which surfaces is roughened to provide a plurality of evenly and randomly distributed pits, substantially all of said pits being interconnected to adjacent pits to permit flow of bearing fluid therebetween, saids pits constituting said bearing fluid channels.
Claim 3
Dependent Claim
78 words
A bearing according to claim 1, wherein the bearing is a journal bearing and the member is a cylindrical shaft and wherein said bearing surface defines a cylindrical surface of slightly larger diameter than the diameter of said shaft and within which cylindrical surface said shaft is disposed and wherein said channels extend between a plenum chamber and said cylindrical surfaces and are defined between a pair of annular flat surfaces maintained in fixed relationship to each other.
Claim 4
Dependent Claim
15 words
A bearing according to claim 2, wherein said surfaces are held together under axial pressure.
Claim 5
Dependent Claim
33 words
A bearing according to claim 3, in which each roughened surface is formed on a component of the body in the form of an annular plate, which component is sandwiched between other components.
Claim 6
Dependent Claim
86 words
A bearing according to claim 1, wherein the bearing is a thrust bearing and wherein the member has an end surface extending transversely of the axis of rotation of the member and wherein the body has a portion thereof defining a bearing surface of a shape complementary to the end surface of the member, and wherein said channels extend to the space between said end surface and the bearing surface at a position spaced inwardly of the outer periphery of the bearing surface of the body.
Claim 7
Dependent Claim
31 words
A bearing according to claim 5, wherein said complementary surfaces between which said channels are defined are of cylindrical configuration and are co-axial with the axis of rotation of the member.
Claim 8
Dependent Claim
131 words
A bearing according to claim 6, wherein the body comprises a core member of stepped cylindrical configuration, having one part of a larger diameter than another part of a smaller diameter, and there being a shoulder extending radially outwardly from the periphery of the smaller diameter part, and there being a ring member having two adjacent surfaces mutually inclined at right angles and positioned on said shoulder, said adjacent surfaces of the ring member being positioned so that one surface, of cylindrical configuration, is positioned adjacent the wall of the smaller diameter part of the core member whilst the other surface, of annular configuration, is positioned adjacent said shoulder, and wherein the wall of the smaller diameter part and the cyliNdrical wall of the ring member define said feed channels therebetween.
Claim 9
Dependent Claim
115 words
A bearing according to claim 5, wherein the bearing is a combination thrust and journal bearing, the member including a cylindrical portion adapted to encircle a portion of the body and wherein second bearing fluid channels are provided extending from a plenum chamber to the space between the cylindrical portion and the body, and said second channels being defined between a pair of complementary surfaces maintained in fixed relationship to each other, at least one of said surfaces being roughened to provide a plurality of evenly and randomly distributed pits, substantially all of said pits being interconnected to adjacent pits to permit flow of bearing fluid therebetween, said pits constituting said second bearing fluid channels.
Claim 10
Dependent Claim
31 words
A bearing according to claim 8, wherein said second channels are defined between surfaces of annular configuration and lying in a plane normal to the axis of rotation of the member.
Claim 11
Dependent Claim
56 words
A bearing according to claim 1, wherein the bearing is a linear bearing and said body includes a rectilinearly extending bearing surface and said member has a bearing surface of complementary configuration thereto and wherein said surfaces defining said channels in the body extend in the direction of relative movement between the member and the body.
Claim 12
Dependent Claim
24 words
A bearing according to claim 10, wherein said surfaces between which said channels are defined are planar and extend normal to said bearing surfaces.
Claim 13
Dependent Claim
78 words
A bearing according to claim 11, wherein the body has a core part having longitudinally extending shoulders on opposite sides thereof, the surfaces of the core part defining each shoulder including a surface which extends normal to said bearing surfaces and wherein an elongate member having two mutually inclined adjacent surfaces is positioned in each of said shoulders, and wherein said surfaces and the surfaces of the elongate members adjacent thereto comprise said surfaces defining the feed channels.
Claim 14
Dependent Claim
86 words
A bearing according to claim 10, wherein the body is provided with second bearing fluid channels extending transversely of the body normal to the first mentioned channels and being defined between a pair of complementary surfaces maintained in fixed relationship to each other, at least one of said surfaces being roughened to provide a plurality of evenly and randomly distributed pits, substantially all of said pits being interconnected to adjacent pits to permit flow of bearing fluid therebetween, said pits constituting said second bearing fluid channels.
Claim 15
Dependent Claim
19 words
A bearing according to claim 1, wherein the or at least one of the roughened surfaces has been lapped.
Claim 16
Dependent Claim
22 words
A bearing according to claim 1, wherein the pits have a depth lying in the range from 0.004 in. to 0.003 in.
Claim 17
Dependent Claim
24 words
A bearing according to claim 1, wherein the pits have an area lying in the range from 0.00001 sq. in. to 0.00008 sq. ins.
Claim 18
Dependent Claim
75 words
A method of manufacturing a fluid lubricated hydrostatic bearing as claimed in claim 1, including the steps of subjecting a surface of a component of the bearing to treatment with a high velocity stream of abrasive particles for a length of time sufficient to produce the required degree of roughening so that the surface, in co-operation with a surface of another component of the bearing, defines feed channels for the lubricating fluid of the bearing.
Claim 19
Dependent Claim
19 words
A method according to claim 17, wherein the stream of abrasive particles is directed substantially normally to the surface.
Claim 20
Dependent Claim
23 words
A method according to claim 17, wherein the surface is lapped subsequent to said treatment with a high velocity stream of abrasive particles.
Claim 21
Dependent Claim
22 words
A method according to claim 17 wherein the pits have a depth lying in the range from 0.0004 in. to 0.003 in.
Claim 22
Dependent Claim
23 words
A method according to claim 17 wherein the pits have an area lying in the range from 0.00001 sq. in. to 0.00008 sq.in.
Claim 23
Dependent Claim
17 words
A bearing according to claim 1 wherein said first and sEcond body parts are made of metal.
References Cited (Backward Citations)
US3368850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |