Pressure relief exclusion seal
US4426090A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Sep 24, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/928
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An exclusion seal for being removably mounted in a bearing mount is formed with an annular housing with an internal sealing means having a sealing ring is constructed to prevent a "blow-out" of the seal due to the high lubricant pressure. The annular housing has an annular ring wall and a radially extending wall defining an annular chamber in which is received the annular sealing ring which has an annular sealing surface for sealing engagement with an annular surface on a rotating shaft or on a bearing mount. The annular housing is often compressible to have a press fit connection to the bearing mount. One side of the seal is exposed to the grease and if the grease pressure exceeds a predetermined value the sealing ring shifts axially against a biasing force to uncover an outlet orifice formed in the ring wall of the housing to permit lubricant to escape. When the lubricant pressure drops below the predetermined value, the biasing force returns the sealing ring to again cover the outlet orifice. The predetermined value of lubricant pressure necessary to permit lubricant escape is less than the pressure which would cause failure of the sliding and fixed circumferential seals so that…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.