Exhaust gas recirculation valve construction and method of making the same
US4782811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1987 |
| Grant date | Nov 8, 1988 |
| Priority date | — |
| Expiry date | Mar 30, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M26/54
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An exhaust gas recirculation valve construction and method of making the same are provided, the valve construction comprising a housing provided with an inlet and an outlet separated by a valve seat, an axially movable valve member carried by the housing for opening and closing the valve seat, an electrically operated stepper motor carried by the housing and being operatively interconnected to the valve member for axially positioning the valve member relative to the valve seat, the motor having a rotatable rotor threadedly interconnected to the valve member to cause axial movement of the valve member upon rotatable movement of the rotor, the valve member and the valve seat being arranged so as to be reverse acting, and a spring being operatively interconnected to the valve member to always move the valve member from an open position thereof to its closed position with the valve seat upon loss of electrical current to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.