Bi-directional hydrodynamic shaft seal method
US4118856A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1974 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Dec 2, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49918
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for producing a bi-directional hydrodynamic sealing element for a shaft seal wherein the sealing element is made from a non-elastomeric material such as polytetrafluoroethylene, and has a sealing lip and a plurality of bi-directional pumping elements on a shaft engaging surface thereof, formed as a series of non-concentric circles or other geometric figures on the non-elastomeric sealing element while it is flat. The centers of the non-concentric circles are located on the periphery of a circle concentric with the sealing lip. The flat sealing element is then formed into a conical lip type sealing element and the circular pumping elements become elliptically shaped, bi-directonal helical pumping elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.