Diesel unit fuel injector with spill assist injection needle valve closure
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United States of America Patent
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-
May 3, 1988
Grant Date -
N/A
app pub date -
Nov 28, 1986
filing date -
Nov 28, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A diesel unit fuel injector includes a pump assembly having an externally actuated plunger reciprocable in a bushing which with the plunger defines a pump chamber, with flow therefrom during an injection cycle portion of the pump stroke being directed to a fuel injection nozzle of the assembly. The injection nozzle includes a needle type differential area injection valve that is normally biased to a valve closed position by a valve return spring which is positioned in a spring chamber and which is operatively connected to the opposite end of the injection valve. Passage means, including orifice passage are used to direct spill flow from the pump chamber at the end of an injection cycle to the spring chamber to effect closure of the injection valve at a valve closing pressure which is greater than the valve opening pressure so that the pressure of the discharge of fuel at the end of an injection cycle is relatively great whereby to effect increased penetration of the discharged fuel into the associate combustion chamber of a diesel engine.
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