Patent ID: 6845762

Claim:
An emission control valve for controlling flow of gases with respect to combustion chamber space of an internal combustion engine comprising: a valve body comprising a passageway having an inlet port for receiving gases and an outlet port for delivering gases to the combustion chamber space; a valve element that is selectively positioned to selectively restrict the passage; and a mechanism for selectively positioning the valve element comprising a solenoid having an electromagnet coil bounding an interior space, a stator that is associated with the coil to provide a magnetic circuit for conducting magnetic flux generated electric current flows in the coil and that comprises pole pieces cooperatively defining an air gap disposed within the interior space bounded by the coil and bridged by the magnetic flux, and an armature that is disposed within the interior space to be displaced along an imaginary centerline passing through the interior space by the magnetic flux bridging the air gap to position the valve element; wherein the armature comprises a cylindrical outer wail extending between its axial ends and a transverse wall disposed interior of the cylindrical outer wall and spaced axially from both axial ends of the cylindrical outer wall, and the transverse wall and the cylindrical outer wall integrally join together at corners that are chamfered as viewed in cross section.