US3904211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary face seal
Assignee: Motors Liquidation Co
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Filing: 1973-12-03
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Granted: 1975-09-09
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Expires: 1993-12-03
Abstract
Abstract A rotary face seal for the space between a stationary housing and a rotatable shaft extending therethrough uses a heat shrinkable polytetrafluoroethylene tube to form a secondary sealing boot that prevents leakage around a spring biased primary sealing face. The boot restrains relative rotation of the sealing face with respect to the shaft, damps out torsional vibration under high cyclic slip-stick conditions, resists embrittlement and cracking, protects the spring and the relatively axially sliding surfaces from deposit buildup, allows hydrostatic balancing of the pressures on the sealing face, and contains all rotating components in unitized assembly without supplemental stacking or locking tabs.
Inventors
- 👤 Robert L Dega
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:48
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
367 words
In a motor vehicle water pump having a housing defining a pumping cavity and a rotatable shaft extending into the cavity and carrying an impeller for pumping coolant therethrough, a rotary face seal for sealing the space between the housing and the shaft for preventing the leakage of coolant from the cavity comprising: an annular retainer fixedly connected to the housing; an annular ceramic seal head carried by the retainer and through which the shaft projects, said seal head having a flat radial sealing surface disposed in the cavity coaxial with the shaft; a seal cup having a cylindrical hub carried by the shaft and axially spaced from the seal head and a radial flange extending outwardly from one end of the hub and terminating with a reversely directed cylindrical rim partially overlying the hub; an annular sealing ring formed of a material softer than the seal head, said sealing ring being loosely received over the hub and axially slidable between the hub and the rim, said sealing ring having a cylindrical body with an enlarged annular shoulder at the end remote from the flange, said shoulder being axially spaced from the rim to define therebetween a groove, the depth of the groove being selected to provide a predetermined hydrostatic balancing on the ring under coolant pressure; an annular axially projecting seal land on the end surface of the body, said land having a flat surface engageable with the sealing surface of said seal head; a compression spring operatively connected between said sealing ring and said flange, said spring axially biasing said seal land into sealing engagement with the sealing surface of said seal head; and a cylindrical sealing boot formed of a heAt shrinkable material, said boot conforming to the outer contours of the shoulder, the groove, and the rim, said boot establishing a flexible section at said groove which permits limited axial movement of the ring to accommodate parts misalignment and torsionally interconnects said sealing ring and said seal cup in unitized assembly, said boot preventing leakage between said seal cup and said sealing ring and restraining relative rotation of said sealing ring relative to said seal cup while torsionally yielding to damp out vibrations.
Claim 2
Dependent Claim
367 words
In a motor vehicle water pump having a housing defining a pumping cavity and a rotatable shaft extending into the cavity and carrying an impeller for pumping coolant therethrough, a rotary face seal for sealing the space between the housing and the shaft for preventing the leakage of coolant from the cavity comprising: an annular retainer fixedly connected to the housing; an annular ceramic seal head carried by the retainer and through which the shaft projects, said seal head having a flat radial sealing surface disposed in the cavity coaxial with the shaft; a seal cup having a cylindrical hub carried by the shaft and axially spaced from the seal head and a radial flange extending outwardly from one end of the hub and terminating with a reversely directed cylindrical rim partially overlying the hub; an annular sealing ring formed of a material softer than the seal head, said sealing ring being loosely received over the hub and axially slidable between the hub and the rim, said sealing ring having a cylindrical body with an enlarged annular shoulder at the end remote from the flange, said shoulder being axially spaced from the rim to define therebetween a groove, the depth of the groove being selected to provide a predetermined hydrostatic balancing on the ring under coolant pressure; an annular axially projecting seal land on the end surface of the body, said land having a flat surface engageable with the sealing surface of said seal head; a compression spring operatively connected between said sealing ring and said flange, said spring axially biasing said seal land into sealing engagement with the sealing surface of said seal head; and a cylindrical sealing boot formed of a heAt shrinkable material, said boot conforming to the outer contours of the shoulder, the groove, and the rim, said boot establishing a flexible section at said groove which permits limited axial movement of the ring to accommodate parts misalignment and torsionally interconnects said sealing ring and said seal cup in unitized assembly, said boot preventing leakage between said seal cup and said sealing ring and restraining relative rotation of said sealing ring relative to said seal cup while torsionally yielding to damp out vibrations.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |