Patent US4596474A successfully refreshed from Google Patents.
US4596474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing system comprising two facing hydrodynamic bearings
Assignee: US Philips Corp
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Filing: 1985-06-11
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Granted: 1986-06-24
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Expires: 2005-06-11
Abstract
Abstract A bearing system comprises two hydrodynamic bearings 5 and 7 by means of which two bodies 1 and 3 are rotatably supported relative to one another. Each of the bearings 5 and 7 has an inner and an outer pattern of helical grooves, which patterns in the direction of rotation for which the bearing system is intended build-up in opposite direction a pressure in lubricant. A reservoir 17 is situated between the bearings 5 and 7 and has two patterns 27 and 29 of feed grooves which pump lubricant towards the bearings 5 and 7 during operation.
Inventors
- 👤 Franciscus M. J. Van Roemburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:09
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; F16C33/102
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
157 words
A bearing system comprising two axially spaced hydrodynamic bearings by means of which two bodies, which comprise cooperating bearing surfaces, are supported for rotation about an axis of rotation relative to each other, at least one of the bearing surfaces of each of the bearings being formed with an inner pattern of helical grooves and an outer pattern of helical grooves which two patterns of grooves act in opposite directions to build-up a pressure in lubricant between the cooperating bearing surfaces during rotation of the bearing system in the direction for which it is intended, cylindrical wall portions of the bodies being situated between the two inner patterns, characterized in that a lubricant reservoir is formed by a gap between the said cylindrical wall portions, which reservoir is provided with two patterns of helical feed grooves, which are formed at least in one of the wall portions and which during operation pump the lubricant towards the bearings.
Claim 2
Dependent Claim
157 words
A bearing system comprising two axially spaced hydrodynamic bearings by means of which two bodies, which comprise cooperating bearing surfaces, are supported for rotation about an axis of rotation relative to each other, at least one of the bearing surfaces of each of the bearings being formed with an inner pattern of helical grooves and an outer pattern of helical grooves which two patterns of grooves act in opposite directions to build-up a pressure in lubricant between the cooperating bearing surfaces during rotation of the bearing system in the direction for which it is intended, cylindrical wall portions of the bodies being situated between the two inner patterns, characterized in that a lubricant reservoir is formed by a gap between the said cylindrical wall portions, which reservoir is provided with two patterns of helical feed grooves, which are formed at least in one of the wall portions and which during operation pump the lubricant towards the bearings.
Claim 3
Dependent Claim
38 words
A bearing system as claimed in claim 1, characterized in that the outer patterns of grooves of the bearings build-up a pressure in lubricant which is higher than the pressure in lubricant built-up by the other patterns together.
Claim 4
Dependent Claim
31 words
A bearing system as claimed in claim 2, characterized in that the bodies have non-grooved wall portions situated between the inner patterns of the bearings and the patterns of the reservoir.
Claim 5
Dependent Claim
24 words
A bearing system as claimed in claim 3, characterized in that one of the bodies has a lubricant-supply duct, which opens into the reservoir.
Claim 6
Dependent Claim
37 words
A bearing system as claimed in claim 4, characterized in that in one of the wall portions the reservoir has a circumferential recess which surrounds the axis of rotation and which communicates directly with the supply duct.
Claim 7
Dependent Claim
24 words
A bearing system as claimed in claim 2, characterized in that one of the bodies has a lubricant-supply duct, which opens into the reservoir.
Claim 8
Dependent Claim
37 words
A bearing system as claimed in claim 6, characterized in that in one of the wall portions the reservoir has a circumferential recess which surrounds the axis of rotation and which communicates directly with the supply duct.
Claim 9
Dependent Claim
31 words
A bearing system as claimed in claim 1, characterized in that the bodies have non-grooved wall portions situated between the inner patterns of the bearings and the patterns of the reservoir.
Claim 10
Dependent Claim
24 words
A bearing system as claimed in claim 8, characterized in that one of the bodies has a lubricant-supply duct, which opens into the reservoir.
Claim 11
Dependent Claim
37 words
A bearing system as claimed in claim 9, characterized in that in one of the wall portions the reservoir has a circumferential recess which surrounds the axis of rotation and which communicates directly with the supply duct.
Claim 12
Dependent Claim
24 words
A bearing system as claimed in claim 1, characterized in that one of the bodies has a lubricant-supply duct, which opens into the reservoir.
Claim 13
Dependent Claim
37 words
A bearing system as claimed in claim 11, characterized in that in one of the wall portions the reservoir has a circumferential recess which surrounds the axis of rotation and which communicates directly with the supply duct.
References Cited (Backward Citations)
US3517973A
Cited
US3669517A
Cited
US3602555A
Cited
US4141603A
Cited
JPS5737116A
Cited
JPS5830525A
Cited
DE3325985A1
Cited
WO1984001006A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |