US4283064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary shaft seal
Assignee: Dana Inc
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Filing: 1977-11-21
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Granted: 1981-08-11
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Expires: 1997-11-21
Abstract
Abstract A hydrodynamic shaft seal is provided having a single annular shaft engaging washer clamped within a metal case. The washer, prior to assembly on the shaft, has an inner wall which is perpendicular to the flat walls thereof but spaced from the longitudinal axis of the washer by a distance which increases and decreases in a cyclic radially undulating fashion. Thus, the inner diameter of the unstressed annular member is scalloped and includes from one to approximately sixteen periodic scallops, the number of such scallops preferably increasing as the diameter of the seal increases. Such a seal is particularly easy to make and the varying angle of contact of the seal with the shaft occasioned by the scallops provides excellent hydrodynamic pumping as is desirable in such seals.
Inventors
- 👤 Thomas E. Staab
- 👤 Joseph Antonini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:52
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3284; F16J15/3204; F16J15/3228; F16J15/3244
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
104 words
A hydrodynamic shaft seal comprising an annular casing having an axis and a sealing element, said casing engaging the radially outer edge of the sealing element, the sealing element comprising an annular disc of elastomeric material, said disc comprising two faces and a generally annular inner surface extending between and forming edges with said faces, at least one of said edges being radially displaced from said casing axis by varying distances when said sealing element is unstressed, wherein said at least one of said edges is a circumferentially continuous radially innermost sealing edge of said seal when said seal is mounted on a shaft.
Claim 2
Dependent Claim
104 words
A hydrodynamic shaft seal comprising an annular casing having an axis and a sealing element, said casing engaging the radially outer edge of the sealing element, the sealing element comprising an annular disc of elastomeric material, said disc comprising two faces and a generally annular inner surface extending between and forming edges with said faces, at least one of said edges being radially displaced from said casing axis by varying distances when said sealing element is unstressed, wherein said at least one of said edges is a circumferentially continuous radially innermost sealing edge of said seal when said seal is mounted on a shaft.
Claim 3
Dependent Claim
11 words
The seal of claim 1 wherein said sealing element comprises polytetrafluoroethylene.
Claim 4
Dependent Claim
51 words
The seal of claim 1 wherein said at least one of said edges is defined by a plurality of arcs having radii less than the average distance between said casing axis and said at least one of said edges and having centers located between said casing axis and the seal element.
Claim 5
Dependent Claim
32 words
The seal of claim 3 wherein said arcs have a radius of from about 75% to 90% of the distance between said casing axis and said at least one of said edges.
Claim 6
Dependent Claim
11 words
The seal of claim 3 wherein said sealing element comprises polytetrafluoroethylene.
Claim 7
Dependent Claim
11 words
The seal of claim 4 wherein said sealing element comprises polytetrafluoroethylene.
Claim 8
Dependent Claim
15 words
The seal of claim 1 wherein said sealing element consists essentially of a single disc.
Claim 9
Dependent Claim
22 words
A hydrodynamic shaft seal as defined in claim 1 wherein said two faces of said sealing element are substantially flat and parallel.
Claim 10
Dependent Claim
27 words
A hydrodynamic shaft seal as defined in claim 8 wherein said annular inner surface of said sealing element is substantially perpendicular to each of said two faces.
Claim 11
Dependent Claim
103 words
A shaft having a generally longitudinal axis and a hydrodynamic shaft seal mounted on said shaft, said seal comprising an annular casing and a sealing element, said casing engaging the radially outer edge of the sealing element, the sealing element comprising an annular disc of elastomeric material, said disc comprising two faces and a generally annular inner surface extending between and forming edges with said faces, at least one of said edges being radially displaced from said axis by varying distances when said seal is unstressed, wherein said at least one of said edges is in continuous circumferential sealing contact with said shaft.
Claim 12
Dependent Claim
103 words
A shaft having a generally longitudinal axis and a hydrodynamic shaft seal mounted on said shaft, said seal comprising an annular casing and a sealing element, said casing engaging the radially outer edge of the sealing element, the sealing element comprising an annular disc of elastomeric material, said disc comprising two faces and a generally annular inner surface extending between and forming edges with said faces, at least one of said edges being radially displaced from said axis by varying distances when said seal is unstressed, wherein said at least one of said edges is in continuous circumferential sealing contact with said shaft.
Claim 13
Dependent Claim
103 words
In a hydrodynamic shaft seal adapted to be mounted on a shaft, said seal comprising an annular casing having an axis and a sealing element, said casing engaging the radially outer edge of said sealing element, said sealing element comprising an annular disc of elastomeric material, said disc comprising two faces and a generally annular inner surface extending between and forming edges with said faces, at least one of said edges adapted for continuous circumferential sealing contact with said shaft, the improvement wherein said at least one edge is radially displaced from said casing axis by varying distances when said seal is unstressed.
Claim 14
Dependent Claim
103 words
In a hydrodynamic shaft seal adapted to be mounted on a shaft, said seal comprising an annular casing having an axis and a sealing element, said casing engaging the radially outer edge of said sealing element, said sealing element comprising an annular disc of elastomeric material, said disc comprising two faces and a generally annular inner surface extending between and forming edges with said faces, at least one of said edges adapted for continuous circumferential sealing contact with said shaft, the improvement wherein said at least one edge is radially displaced from said casing axis by varying distances when said seal is unstressed.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |