Patent ID: 6786467
Filing Date: 2004-09-07
Classification: F02M,F16K,H01F

Abstract:
An electric-actuated control valve for controlling flow of fluid in an automotive vehicle engine system comprising:a valve body comprising a passageway having an inlet port for receiving fluid and an outlet port for delivering fluid; a valve element that is selectively positioned to selectively restrict the passage; and a mechanism for selectively positioning the valve element comprising a solenoid actuator comprising a bobbin having ferromagnetic pole pieces spaced axially apart, and joined by a tubular core of non-ferromagnetic metal, and an electromagnet coil comprising a length of magnetic wire wound on the tubular core between the pole pieces; the pole pieces forming portions of a magnetic circuit for magnetic flux created by electric current in the coil and comprising hubs that protrude into the tubular core and have juxtaposed ends defining an air gap within the tubular core through which the magnetic flux passes between the pole piece hubs; the mechanism further comprising an armature that is guided for motion axially of the tubular core for positioning the valve element and that comprises ferromagnetic material for conducting magnetic flux created at the air gap when electric current flows in the coil to cause an axial component of electromagnetic force to be exerted on the armature for positioning the valve element.