Lip seal assembly for a rotatable shaft
US4844485A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Oct 28, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3244
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An annular seal assembly for sealing an enclosed rotatable shaft. An annular sealing element is frictionally retained between portions of inner and outer metallic cases. The sealing element includes a sealing annulus and a reinforcing annulus which are disposed in laminar fashion and retained between the outer and inner cases. The sealing annulus is deflected by and sealingly engages the outer surface of the shaft when inserted therein. The reinforcing annulus is formed of silicone and is disposed adjacent to the sealing annulus so as to urge the sealing annulus into sealing engagement with the enclosed shaft, particularly when the sealing annulus is cold or when the shaft is highly eccentric. The reinforcing annulus is responsive to an increase in temperature or to an absorption of liquid for increasing in size, thereby reducing the amount of compressive force exerted thereby against the deflected portion of the sealing annulus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.