Decoupled valve assembly and fuel injector using same
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United States of America Patent
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Jun 11, 2013
Grant Date -
Jan 14, 2010
app pub date -
Jul 8, 2008
filing date -
Jul 8, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A valve assembly including an armature and a valve member that are coupled when the solenoid coil is de-energized but are decoupled after the solenoid coil is energized. A first spring biases the armature and the valve member to a closed valve seat position while a second spring having a smaller preload than the first spring biases the valve member to an open valve seat position. When the solenoid coil is energized, the magnetic force of the coil overcomes the force exerted by the first spring pulling the armature away from the valve member. The valve member moves to the open valve seat position by the force exerted by the second spring. When the coil is de-energized, the magnetic force decays, thereby allowing the armature and the valve member to re-couple.
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