Fluid sprinkling – spraying – and diffusing – Fluid pressure responsive discharge modifier* or flow... – Fuel injector or burner
Patent
1992-04-15
1994-02-15
Mitchell, David M.
Fluid sprinkling, spraying, and diffusing
Fluid pressure responsive discharge modifier* or flow...
Fuel injector or burner
2395854, 239596, 239600, F02M 6116, B05B 116
Patent
active
052859703
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a method for adjusting the static fuel quantity injected during the steady opening state of a fuel injection valve, as generically defined hereinafter, as well as to a fuel injection valve, as disclosed herein and known from German Patent Disclosure Document DE-OS 37 10 467. The fuel injection valve known from DE-OS 37 10 467 has a perforated disk downstream of its valve seat. The adjustment of the static fuel quantity is effected by the accurate manufacture of the metering openings embodied in the perforated disk. Despite the high production investment, the deviation in the static fuel quantity of individual mass-produced fuel injection valves is undesirably pronounced. This creates the danger that a variably high fuel quantity will be delivered to the various cylinders of an internal combustion engine.
OBJECT AND SUMMARY OF THE INVENTION
The method according to the invention for adjusting the static fuel quantity produced during the steady opening state of a fuel injection valve, and the fuel injection valve have the advantage over the prior art that the static fuel quantity is adjustable in a simple manner, in the otherwise completely assembled fuel injection valve, by varying the free flow cross sections of the metering openings. This makes it possible to assure that the mass-produced fuel injection valves exhibit especially slight deviation in the static fuel quantity, and that the same fuel quantity will be metered to the various cylinders of an internal combustion engine, for instance.
An improvement in fuel atomization is moreover attained by the partial coverage of the metering openings.
Further advantageous features of and improvements to the method revealed as well as the fuel injection valve are possible with the provisions recited in the dependent claims.
Advantageously, the perforated disk in the valve housing can be rotated relative to one another in order to adjust the static fuel quantity.
For the especially simple, economical embodiment of a fuel injection valve serving to carry out the method of the invention, it is advantageous if the flow opening, provided immediately upstream of the perforated disk, of the flow conduit of the fuel injection valve has a cross section that deviates from the circular shape, preferably being in the form of an oblong slot or a rosette.
For the same reason, it is also advantageous if an intermediate disk is provided axially immediately upstream of the perforated disk, that is, between the face end of the nozzle body and the perforated disk, the intermediate disk being supported in a manner fixed against rotation and firmly joined to the nozzle body, with its at least one through opening communicating with both the flow opening of the flow conduit and the metering openings of the perforated disk.
It is especially advantageous if the intermediate disk has the same number of through openings as the perforated disk has metering openings, and if the metering openings of the perforated disk and the through openings of the intermediate disk have the same diameter and are embodied on the same hole circle diameter.
It is especially advantageous if the perforated disk and the intermediate disk are manufactured as identical parts, which has advantages not only in terms of simple and more economical manufacture but also assembly. This embodiment of the perforated disk and intermediate disk is especially practical if the perforated disk and the intermediate disk are rotatable relative to one another for adjusting the static fuel quantity by the method of the invention.
For the sake of embodying the metering openings of the perforated disk and the through openings of the intermediate disk with especially sharp edges, it is advantageous if the perforated disk and/or the intermediate disk are made of monocrystalline silicon, resulting in especially good fuel atomization.
DRAWING
Exemplary embodiments of the invention are shown in simplified form in the drawing and described in further detail in the ensuing descri
REFERENCES:
patent: 1947407 (1934-02-01), Cornell
patent: 4040396 (1977-08-01), Tomita
patent: 4907748 (1990-03-01), Gardner et al.
patent: 4923169 (1990-05-01), Grieb et al.
Buchholz Juergen
Maier Martin
Greigg Edwin E.
Greigg Ronald E.
Mitchell David M.
Robert & Bosch GmbH
Weldon Kevin P.
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