Exhaust gas recirculation valve assembly
US4998707A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1990 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Jun 13, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/6579
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An exhaust gas recirculation valve assembly for controlling the recirculation of exhaust gas in an internal combustion engine has an electrically operated valve member that meters flow of exhaust gas through an exhaust gas chamber. A valve member has a valve stem extending to an actuator which is isolated from the base housing the exhaust gas, and the valve is surrounded by a pair of spring-biased seals that seal openings around the valve stem into the actuator and the exhaust gas chamber. The seal closing the actuator opening has an inverted, cup-shaped configuration which encloses the valve stem between the actuator and the base thereby preventing impingement thereon of contaminants which could be carried into the actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.