Radial lip seal having protected porous dust excluder
US6257587A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | May 21, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/918
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A shaft seal assembly includes an outer stationary carrier, an inner member, and a sealing system including a primary lubricant-retention seal that is fixed to the carrier in combination with a number of debris-excluding seal features. Such features include a first debris-exclusion seal fixed to the carrier adjacent the primary seal and a second debris-exclusion seal that is mounted on either the carrier or inner member and has at least one lip sealingly engaging the other of the carrier and inner member in spaced relation to the first debris-exclusion lip defining a sealed annular cavity therebetween. Disposed within the cavity is a porous filter element in the preferred form of an open cell sponge. The various dust exclusion features cooperate to allow each to perform efficiently. The outermost second debris-exclusion seal guards the foam against substantial debris, and the foam in turn protects the first debris-exclusion lip against virtually all debris. That which escapes the filter is prevented by the first seal member from contacting the primary oil-retention lip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.