APPARATUS FOR CONTROLLING NEEDLE VALVE LEAKAGE
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United States of America Patent
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N/A
Issued Date -
Feb 12, 2015
app pub date -
Apr 26, 2012
filing date -
Apr 26, 2012
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A needle body for a fuel injector that controls or prevents high pressure fuel leaks by dynamically controlling the size of the clearance between a longitudinal bore in a nozzle body and the needle that travels along the bore. The longitudinal bore passes through a body portion and a clearance control protrusion of the needle body. The clearance control protrusion extends from the body portion into a nozzle chamber of a nozzle section of the fuel injector. The clearance control protrusion is configured to prevent expansion of the clearance that is typically associated with hydraulic forces caused by pressurized fuel in the clearance. The clearance control protrusion is configured so that as fuel pressure in the nozzle chamber increases, hydraulic forces act against an outer surface of the clearance control protrusion to prevent expansion of the portion of the clearance positioned within the clearance control protrusion.
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