Bidirectional seal with elliptical sealing barriers
US4739998A · kind A · utility
31Cited by
16References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Nov 21, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3244
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A bidirectional shaft seal includes a plurality of concentric, radially-staggered contact surfaces arranged so as to engage a shaft along elliptical contact bands. Each contact band forms a static and dynamic barrier to prevent leakage under clockwise and couterclockwise shaft rotation. The elliptical contact may be achieved by offsetting the center of the seal lip from the axis of the shaft or by eccentrically clamping or bonding the seal lip within a seal case and mounting the seal lip concentrically with the shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.