Sealing device
US5201529A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Oct 15, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3256
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A sealing device provides sealing between two members adapted for relative concentric motion. The main seal comprises a pair of annual seal members attached respectively to the two members. An auxiliary seal serves to prevent the intrusion of foreign matter into the main seal. The auxiliary seal comprises a minute gap having a spiral flow passage which exerts a screw pump action to discharge external foreign matter to the side opposite to the main seal due to relative rotation. The main seal includes a first seal member having a radially extending flange portion abutting an end surface of a housing. The main seal includes a second seal member having a radially extending portion opposed to the radially extending flange portion of the first seal member. A buffer portion for buffering axial load is located between the flange portion and the radially extending portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.