Fuel injector and method of manufacturing the same
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United States of America Patent
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Oct 19, 2004
Grant Date -
Sep 19, 2002
app pub date -
Mar 15, 2002
filing date -
Mar 16, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A fuel injector including a tubular casing having an axial fuel passage. Disposed within the fuel passage are a valve seat element, a core cylinder, and a valve element axially moveably disposed therebetween and opposed to the core cylinder with an axial air gap. An electromagnetic actuator cooperates with the casing, the valve element and the core cylinder to form a magnetic field forcing the valve element to the open position against a spring between the valve element and the core cylinder upon being energized. The casing includes a reluctance portion producing an increased magnetic reluctance and allowing the magnetic field to extend to the valve element and the core cylinder through the air gap. The reluctance portion has a reduced radial thickness and an axial length extending over the air gap.
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