Fuel injector method and apparatus
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United States of America Patent
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-
Jan 29, 1991
Issued Date -
N/A
app pub date -
Aug 3, 1990
filing date -
Mar 28, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
One spring and two spring embodiments of a fuel injector having a nozzle body and needle valve with cooperating inner and outer metering rings providing a metering passage which (a) meters fuel at a reduced rate during an initial increment of valve lift, (b) assists in maintaining fuel pressure at the valve seat to reduce fuel dribble and cavitation erosion during a corresponding last increment of valve closure and (c) dampens secondary pressure waves to prevent secondary fuel injection.
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