Fuel injector

Details Fuel injector Fuel injector

1999-05-14

2001-11-27

Morris, Lesley D. (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Injection nozzle opened by relieving supply

Reexamination Certificate

active

06321999

ABSTRACT:

This invention relates to a fuel injector for use in supplying fuel under pressure to a combustion space of a compression ignition internal combustion engine. In particular the invention relates to a fuel injector of the type arranged to receive fuel from an associated fuel pump, for example a pump/injector or an arrangement in which a pump and injector are connected to one another by a high pressure pipe, the pump delivering fuel exclusively to the injector.
In a known pump/injector arrangement, the timing of fuel injection is controlled by controlling the fuel pressure within a control chamber which applies a force to a valve needle of the injector, urging the needle towards a seating. The fuel pressure within the control chamber is conveniently controlled by an electromagnetically actuator valve.
The use of such a control chamber in controlling the operation of the injector requires the provision of a number of additional bores or drillings, thus increasing the complexity of the injector.
According to the present invention there is provided a fuel injector comprising a valve needle spring biased into engagement with a seating to control fuel delivery, the valve needle including a thrust surface orientated such that the application of fuel under pressure thereto applies a force to the needle urging the needle away from the seating, and a valve controlling the application of fuel under pressure to the thrust surface.
The injector conveniently further comprises a fuel pump arranged to supply fuel to the thrust surface when the valve is open. Preferably, the injector further comprises a drain valve controlling communication between a pump chamber of the fuel pump and a fuel reservoir.
Such an injector is advantageous in that the provision of a control chamber is avoided thus the injector is of relatively simple construction.


REFERENCES:
patent: 5282574 (1994-02-01), Koch
patent: 5463996 (1995-11-01), Maley et al.
patent: 5538187 (1996-07-01), Mueller et al.
patent: 5628293 (1997-05-01), Gibson et al.
patent: 5673669 (1997-10-01), Maley et al.
patent: 5697342 (1997-12-01), Anderson et al.
patent: 6067955 (2000-05-01), Boecking
patent: 19512270 (1996-09-01), None

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