Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1997-02-19
1998-03-24
Miller, Carl S.
Internal-combustion engines
Charge forming device
Fuel injection system
123300, 123501, F02M 3704
Patent
active
057301042
ABSTRACT:
A hydraulically-actuated fuel injector comprises an injector body that defines a nozzle chamber that opens to a nozzle outlet and a plunger bore, and a spill port that opens into the plunger bore. A hydraulic means within the injector body pressurizes fuel in the nozzle chamber, and includes a plunger with an end face, a side surface and a centerline. The plunger is positioned in the plunger bore and moveable a stroke distance between a retracted position and an advanced position. A needle valve member is positioned in the nozzle chamber and moveable between an open position in which the nozzle outlet is open and a closed position in which the nozzle outlet is blocked. The plunger includes a groove in its side surface that is arranged in a helical pattern about the centerline and further includes a spill passage extending between the end face and the groove. A pin and guide slot assembly, within the injector body, are provided for rotating the plunger about the centerline when the plunger is moving a portion of the stroke distance between its advanced position and its retracted position. Finally, the injector includes a control valve for stopping the plunger at a metered position between its retracted position and its advanced position when the plunger is retracting from its advanced position.
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Caterpillar Inc.
Miller Carl S.
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