Fuel injector nozzle

Details Fuel injector nozzle Fuel injector nozzle

1998-12-02

2001-11-20

Shaver, Kevin (Department: 3752)

Fluid sprinkling, spraying, and diffusing

With signals, indicators, recorders, meters or changeable...

C239S533200, C239S584000, C239S600000

Reexamination Certificate

active

06318643

ABSTRACT:

This invention relates to a nozzle for a fuel injector intended for use in delivering fuel, under pressure, to a cylinder of a compression ignition engine.
Fuel injector nozzles generally comprise a nozzle body provided with an axially extending blind bore within which a valve needle is slidable, in use. A frustoconical seating is generally provided adjacent the blind end of the bore, the needle being engageable with the seating to control the supply of fuel past the seating to one or more outlet openings.
Where the injector is of relative great length and small diameter, it is difficult and inconvenient to machine the seating, and it is known to provide nozzles of two-part form which comprise a nozzle tip within which the seating is machined and an elongate nozzle holder to which the nozzle tip is secured.
As the nozzle tip is a separate component, the orientation of the outlet openings provided in the nozzle tip relative to the nozzle holder cannot be assured. The axial position of the seating relative to the remainder of the injector may also vary. It is an object of the invention to provide a nozzle and a method of manufacturing a nozzle in which these disadvantages are overcome.
According to the invention there is provided a nozzle comprising a nozzle holder, and a nozzle tip, the nozzle tip being provided with at least one outlet opening and a feature provided on the nozzle tip providing an indication of the position(s) of the opening(s).
The invention also relates to a method of manufacturing a nozzle of the type defined hereinbefore including the step of aligning the feature with part of the nozzle holder.
Clearly, such an arrangement has the advantage that the outlet openings can be correctly and reliably positioned relative to the nozzle holder. Further, a gasket or captured seal can be trapped between the tip and the nozzle holder.
According to another aspect of the invention there is provided a method of manufacturing a nozzle comprising securing a nozzle tip to a nozzle holder and subsequently machining at least one outlet opening in the nozzle tip.


REFERENCES:
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patent: 5964297 (1999-10-01), Edman
patent: 0 242 978 (1987-10-01), None

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