Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2007-01-30
2007-01-30
Kwon, John T. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C239S500000, C239S584000, C239S533120
Reexamination Certificate
active
11035169
ABSTRACT:
An injection nozzle for an internal combustion engine has a valve member moveable within a bore of a nozzle body, and a seating surface defining a seat cone angle the valve member including a first frustoconical valve region, a second frustoconical valve region, and an annular groove defining, in part, a delivery chamber in communication with at least one nozzle outlet. The annular groove is disposed intermediate the first and second valve regions such that a first seating line is defined at the mutual interface between the first valve region and the annular groove and is engageable with the seating surface to control delivery of fuel from a first supply chamber to the deliver chamber, and a second seating line is defined at the mutual interface between the second valve region and the annular groove and is engageable with the seating surface to control delivery from a second supply chamber to the delivery chamber. The second supply chamber is in communication with the first supply chamber by way of a flow path defined within the valve member and as the first and second seating lines are disengaged from the seating surface, fuel is permitted to flow past the first and second seating lines into the at least one nozzle outlet. By virtue of the provision of the first and second valve seats, the flow path and the delivery chamber, the injection nozzle exhibits improved fuel delivery characteristics.
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Cooke Michael P.
Limmer Andrew J.
Delphi Technologies Inc.
Kwon John T.
Wood David P.
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