Gm Global Technolgoy Operations, Inc.

Jay K Sofianek

Robert L Fuss

David Wesley Rogers

Allan M Ruckey

James H Rush

Kurt T Hertzog

Lawrence W Robinson

John F Nally

John E Williams

An electromagnetic fuel injector has an orificed fuel director plate, mounted downstream of a solenoid actuated valve and an associated main orifice passage opened and closed by the valve, to receive fuel when the valve is pulled to an open position from its associated valve seat for controlling and directing flow from the injector. The upper surface of the orifice director plate is provided with a fuel distributing channel system terminating in separate pairs of cooperating injection orifices that are disposed adjacent to one another to direct adjacent jets of fuel which partially intersect one another producing discrete cones of atomized fuel accurately onto separate fuel intake valves of a piston cylinder of an internal combustion engine.

Dual spray director using an 'H' annulus

The armature and active seat of an electromagnetic PWM valve are selectively case hardened at their contacting surfaces to a case depth of approximately 0.50 mm. The hardened areas provide hard contacting surfaces for superior durability, and moreover, create an effective air gap between the armature and the active seat to substantially prevent residual magnetism therebetween. The remaining surfaces of the armature and seat assembly are not hardened, and serve as a low reluctance magnetic flux path around the hardened areas.

PWM electromagnetic valve with selective case hardening

An electromagnetic fuel injector has an orifice director plate, mounted downstream of the orifice passage defined when the solenoid actuated valve of the injector is in the open position relative to its associated valve seat, for controlling static flow from the injector. The orifice director plate is provided with flow orifice passages that are axially downwardly inclined and radially inward extending so as to direct the jets of fuel flow, as desired, relative to the central axis of the orifice director plate and thus to the axis of the spray tip discharge passage of the injector.

Electromagnetic fuel injector with orifice director plate

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Livonia, NY, United States of America

Jay K Sofianek