US3655248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearings and seals with a grooved bearing surface
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1970-07-20
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Granted: 1972-04-11
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Expires: 1990-07-20
Abstract
Abstract In bearings and seals comprising a grooved surface for the dynamical generation of back pressure in the lubricant film, the effect of the grooves is considerably less than proportional to the breadth of the bearing or seal if the breadth to diameter ratio is in the usual range of 0.5 to 2 or more. The proportional relationship is restored by composing each groove of two or more separated shorter grooves. At the same time the grooves'' tendency of transporting pollutions in the lubricant into the gap and collecting them there, is suppressed.
Inventors
- 👤 Gilles Gerardus Hirs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/106; F16C33/107; F16C17/00; F16C17/02; F16C17/026; F16C17/04; F16C17/045; F16J; F16J15/00; F16J15/16; F16J15/40; F16J15/406
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
Bearings and seals with an aerodynamical or hydrodynamical pressure generation in the fluid lubricant between the bearing surfaces, at least one of the bearing surfaces being provided with recesses that form at least one regular groove pattern of unidirectional, shallow grooves for exercising a stemming effect on the lubricant transverse to the direction of movement of the bearing surfaces, the said groove pattern being composed of grooves with a limited length, and the grooves are arranged longitudinally one after another in at least two groups.
Claim 2
Dependent Claim
85 words
Bearings and seals with an aerodynamical or hydrodynamical pressure generation in the fluid lubricant between the bearing surfaces, at least one of the bearing surfaces being provided with recesses that form at least one regular groove pattern of unidirectional, shallow grooves for exercising a stemming effect on the lubricant transverse to the direction of movement of the bearing surfaces, the said groove pattern being composed of grooves with a limited length, and the grooves are arranged longitudinally one after another in at least two groups.
Claim 3
Dependent Claim
20 words
Bearings and seals according to claim 1, wherein the length of the grooves is at least 10 times their breadth.
Claim 4
Dependent Claim
31 words
Bearings and seals according to claim 2, wherein the shortest distance between two grooves situated after one another is at least as great as the shortest distance between two juxtaposed grooves.
Claim 5
Dependent Claim
70 words
Bearings and seals of claim 1 wherein the depth of the grooves is smaller than 5 times the average thickness of the lubricant film and the breadth of the grooves and the bearing surface between the grooves is greater than 5 times the average thickness of the lubricant film and the angle of the grooves to the relative direction of movement of the bearing surfaces in about 10* to 40*.
References Cited (Backward Citations)
US1646371A
Cited
US2663599A
Cited
US3150822A
Cited
US3146036A
Cited
US3420583A
Cited
US3517973A
Cited
US3439962A
Cited
US3441328A
Cited
US3467449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |