US4290655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered self lubricating bearings
Assignee: MERISINTER SpA
•
Filing: 1979-05-15
•
Granted: 1981-09-22
•
Expires: 1999-05-15
Abstract
Abstract A sintered self lubricating bearing comprising at least an area of the inner surface, with a permeability value reduced in respect to that of the remaining mass, the number of reduced permeability areas varying from one to two times the numerical value of the diameter expressed in millimeters.
Inventors
- 👤 Gennaro Apuzzo
- 👤 Gian F. Bocchini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:08
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/06; F16C33/10; F16C33/1025; F16C33/103; F16C33/104; F16C33/106; F16C33/14; F16C33/145; F16C17/00; F16C17/02; F16C2202/00; F16C2202/02; F16C2202/10; F16C33/24; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A sintered self-lubricating bearing, comprising a sleeve of a porous material of a predetermined permeability having a central opening to receive a rotatable shaft, said opening defining an inner surface; and a plurality of areas of a relatively small thickness located on said inner surface, said areas being equally spaced from each other in a circumferential direction and axially extended along an axis of elongation of said sleeve, and having a permeability lower than that of said porous material of said sleeve, whereby said areas reduce the penetration of the lubricating oil into said porous material of said sleeve in the region of maximum pressure and also allow a free circulation of oil within the whole porous sleeve.
Claim 2
Dependent Claim
118 words
A sintered self-lubricating bearing, comprising a sleeve of a porous material of a predetermined permeability having a central opening to receive a rotatable shaft, said opening defining an inner surface; and a plurality of areas of a relatively small thickness located on said inner surface, said areas being equally spaced from each other in a circumferential direction and axially extended along an axis of elongation of said sleeve, and having a permeability lower than that of said porous material of said sleeve, whereby said areas reduce the penetration of the lubricating oil into said porous material of said sleeve in the region of maximum pressure and also allow a free circulation of oil within the whole porous sleeve.
Claim 3
Dependent Claim
29 words
The bearing of claim 1, wherein the ratio between the permeabilities of said areas and said porous material of said sleeve is in the range between 0.05 and 0.95.
Claim 4
Dependent Claim
30 words
The bearing of claim 1, wherein the ratio between said axial extension of said areas and the axial length of said sleeve is in the range between 0.4 and 1.
Claim 5
Dependent Claim
29 words
The bearing of claim 1, wherein the number of said areas is in the range from one to two times the diameter of said inner opening defined in millimeters.
References Cited (Backward Citations)
US2227307A
Cited
US2698774A
Cited
US2894792A
Cited
US3046068A
Cited
US3140131A
Cited
DE1285793B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |