Fuel injection valve

Details Fuel injection valve Fuel injection valve

2002-11-21

2004-07-27

Mar, Michael (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Including valve means in flow line

Reciprocating

C239S585500, C239S533130

Reexamination Certificate

active

06766968

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to A fuel injector.
BACKGROUND INFORMATION
A fuel injector for the direct injection of fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine, the fuel injector including a guide and seat area formed by three disk-shaped elements at the downstream end of the fuel injector is described in German Published Patent Application No. 197 36 682. A swirl element is embedded between a guide element and a valve seat element. The guide element is used to guide an axially movable valve needle that protrudes through the guide element while a valve closing section of the valve needle cooperates with a valve seat surface of the valve seat element. The swirl element includes an inner opening area with multiple swirl channels that are not connected to the outer circumference of the swirl element. The entire opening area extends completely across the axial thickness of the swirl element.
A disadvantage of the fuel injectors described in the publication cited above is the fixedly set swirl angle which may not be adapted to the different operating states of an internal combustion engine such as partial load and full load operation. As a result, it is also not possible to adapt the cone apex angle &agr; of the injected mixture cloud to the various operating states, which results in non-homogeneities during combustion, increased fuel consumption, as well as increased exhaust gas emission.
SUMMARY OF THE INVENTION
In contrast, the present invention may provide the advantage that the swirl is adjustable as a function of the operating state of the internal combustion engine, making it possible to produce a jet pattern adapted to the operating state of the internal combustion engine. This makes it possible to optimize both the mixture formation and the combustion process.
An advantage may be the configuration of the swirl-producing components, which in contrast to conventional swirl formation, are only augmented by a plunger element, which is simple to manufacture and which is slidable onto the valve needle. The plunger element may be activated by a suitable control unit, for example by a piezoelectric, electromagnetic or hydraulic manner.
It may also be an advantage that the swirl disk of the conventional swirl formation may be taken over without modification.
In addition, the funnel-shaped, recessed form of the valve-seat member, which makes it possible to deform the swirl disk elastically and accordingly adjust the swirl, is simple to manufacture.
It may be advantageous that the downstream end of the plunger element include a radial bevel, whose inclination corresponds to that of the funnel-shaped valve-seat member, as a result of which the swirl disk is uniformly deformed and non-homogeneities are prevented.
Also of advantage is the possibility to switch the plunger element into the position appropriate to the present operating state of the fuel injector independently of the lift of the valve needle.
An example embodiment of the present invention is shown in the drawings and explained in the following description.


REFERENCES:
patent: 4192466 (1980-03-01), Tanasawa et al.
patent: 4467965 (1984-08-01), Skinner
patent: 4653694 (1987-03-01), Noguchi et al.
patent: 5642862 (1997-07-01), Wakeman et al.
patent: 6145761 (2000-11-01), Muller et al.
patent: 29 41 536 (1981-04-01), None
patent: 197 36 682 (1999-02-01), None
patent: 0 363 162 (1990-04-01), None
patent: 0 387 085 (1990-09-01), None
patent: 1 041 274 (2000-10-01), None
patent: 09 250428 (1997-09-01), None
Patent Abstracts of Japan, vol. 1998, No. 01, Jan. 30, 1998.

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