Fuel injection nozzle for internal combustion engines
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United States of America Patent
Stats
-
Mar 20, 1990
Grant Date -
N/A
app pub date -
Aug 17, 1988
filing date -
Feb 17, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Fuel injection nozzle for internal combustion engines comprising an inwardly opening valve needle (14) and a nozzle bore hole (20) into which a throttle pivot (18) of the valve needle (14) dips during an initial lift. The throttle pivot (18) is provided with at least two flattened portions (30, 32 and 30, 32, 40, respectively) for forming preferred pass-through cross sections in the nozzle bore hole (20), wherein at least two flattened portions (30, 32 and 32, 40, respectively) end in different cross-sectional planes of the throttle pivot (18). Accordingly, a stepwise enlargement of the total cross section in the nozzle bore hole (20) can be achieved during the initial lift of the valve needle (14) with manufacturing methods which can be controlled in a favorable manner.
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