Patent US4538929A successfully refreshed from Google Patents.
US4538929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodynamic sliding surface bearing
Assignee: Miba Gleitlager Austria GmbH
•
Filing: 1983-09-12
•
Granted: 1985-09-03
•
Expires: 2003-09-12
Abstract
Abstract The friction conditions in a hydrodynamic surface bearing having a bearing metal layer in which no softer bearing metal is embedded are substantially improved in that the bearing surface is formed with grooves, which are distributed over the width of the bearing and include with the direction of movement in the bearing an angle not in excess of 20°. These grooves cooperate with the moving element to be received in the bearing so as to define passages which ensure that a minimum hydrodynamic pressure will be built up in the lubricant.
Inventors
- 👤 Otto Ehrentraut
- 👤 Ulf Ederer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:10
CPC Classifications
F; F16; F16C; F16C9/00; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/107; F16C2240/00; F16C2240/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
In a hydrodynamic sliding surface bearing having a radially inwardly facing annular bearing surface adapted to be covered with a lubricant and to support a moving element movable relative to said bearing surface in a predetermined direction of movement, the improvement which comprises forming said bearing surface with a plurality of grooves extending in, and axially spaced apart transversely to, said longitudinal direction and defining an angle not in excess of 5° with said direction, the grooves cooperating with said moving element so as to define passages adapted to receive said lubricant and to ensure the building up of a minimum hydrodynamic pressure of the lubricant, and the axial spacing of said grooves being less than 10 mm and not in excess of an upper limit a.sub.o =200+0.5d+0.006d.sup.2 in micrometers, wherein d is the diameter of said bearing surface in millimeters.
Claim 2
Dependent Claim
141 words
In a hydrodynamic sliding surface bearing having a radially inwardly facing annular bearing surface adapted to be covered with a lubricant and to support a moving element movable relative to said bearing surface in a predetermined direction of movement, the improvement which comprises forming said bearing surface with a plurality of grooves extending in, and axially spaced apart transversely to, said longitudinal direction and defining an angle not in excess of 5° with said direction, the grooves cooperating with said moving element so as to define passages adapted to receive said lubricant and to ensure the building up of a minimum hydrodynamic pressure of the lubricant, and the axial spacing of said grooves being less than 10 mm and not in excess of an upper limit a.sub.o =200+0.5d+0.006d.sup.2 in micrometers, wherein d is the diameter of said bearing surface in millimeters.
Claim 3
Dependent Claim
38 words
The improvement set forth in claim 1, wherein the axial center spacing of said grooves is not in excess of an upper limit a.sub.o =150+0.3d+0.01d.sup.2 in micrometers, wherein d is the diameter of said bearing surface in millimeters.
Claim 4
Dependent Claim
39 words
The improvement set forth in claim 1, wherein the axial center spacing of said grooves is at least as large as a lower limit a.sub.u =10+0.1d in micrometers, wherein d is the diameter of said bearing surface in millimeters.
Claim 5
Dependent Claim
35 words
The improvement set forth in claim 1, wherein the ratio of the depth t to the width b of said grooves amounts to t/b≦(1500-d)/1500 wherein d is the diameter of said bearing surface in millimeters.
Claim 6
Dependent Claim
85 words
The improvement set forth in claim 1, wherein said moving element is rotatable relative to said bearing surface at a predetermined peripheral velocity, and comprising lands in said bearing surface between said grooves, the ratio of the width of said lands and the axial center spacing of said grooves not being in excess of an upper limit (a-b)/a=100-6v.sub.u.sup.0.6 (%) wherein a is the axial center spacing of said grooves, b is the width of said grooves, and v u is said predetermined design peripheral velocity.
Claim 7
Dependent Claim
81 words
The improvement set forth in claim 1, wherein said moving element is movable relative to said bearing surface at a predetermined velocity, and comprising lands in said bearing surface between said grooves, the ratio of the width of said lands and the center spacing of said grooves not being in excess of an upper limit (a-b)/a=100-6v.sub.u.sup.0.6 (%) wherein a is the center spacing of said grooves, b is the width of said grooves, and v u is said predetermined design velocity.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |