Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Reexamination Certificate
1999-12-14
2001-03-13
Morris, Lesley D. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
C239S585100, C239S900000, C029S890130, C251S129210
Reexamination Certificate
active
06199776
ABSTRACT:
BACKGROUND INFORMATION
The present invention is based on a fuel injection valve, and on a method for manufacturing a valve needle of a fuel injection valve.
A fuel injection valve in which a valve needle is constituted from an armature, a tubular joining part, and a spherical valve closure element is already known from German Published Patent Application 38 31 196 or German Published Application Patent no. 40 08 675. The armature and the valve closure element are joined to one another via the tubular joining element, the joining part, to which the valve closure element is immovably joined via a weld bead, serving as the immediate closure element support. The joining part has a plurality of transversely extending flow openings through which fuel can emerge from an internal passthrough opening and flow, outside the joining part, to the valve closure element and to a valve seat surface coacting with the valve closure element. In addition, the joining tube has a longitudinal slit, extending over the entire length, through which, because of its large hydraulic flow cross section, fuel arriving from the inner passthrough opening can flow very quickly. Most of the fuel to be discharged already flows out of the joining part over its length. The remaining quantity emerges directly from the joining part only upon reaching the spherical surface, so that when viewed over the joining region between joining part and valve closure element, which extends over 360 degrees, there is a definite inhomogeneity in fuel distribution.
SUMMARY OF THE INVENTION
The fuel injection valve according to the present invention, has the advantage that opportunities for fuel flow at the valve needle can be created in economical, reliable, and particularly simple fashion. The valve needle includes at least one closure element support and one valve closure element. The closure element support is shaped, at its end facing the valve closure element, in a manner which deviates from an annular profile such that at least two flowthrough openings are formed between the closure element support and the surface of the valve closure element, through which fuel arriving from an inner longitudinal bore can flow unimpeded toward a valve seat surface. In particularly simple fashion, the downstream end of the closure element support is plastically deformed by deformation tools from an annular profile into a polygonal profile. Optimum flow to the metering region of the valve is thus achieved with little production outlay.
Advantageously, the fuel flows to the surface of the valve closure element in the interior of the closure element support. As compared with known valves, this eliminates transverse openings and slits in the closure element support, which are otherwise needed for the fuel to emerge from the internal sleeve opening of the closure element support. Also eliminated are the machining problems (e.g. deburring) associated with such transverse openings.
In particularly advantageous fashion, the valve closure element is of spherical configuration, so that centering of the valve closure element on the closure element support is particularly easy.
The polygonal profile of the closure element support has an equal number of angle regions and edge regions, corresponding to the number of flowthrough openings. A triangular profile results in the best compromise between the greatest possible open cross section for the sum of the flowthrough openings and good centering of the valve closure element on the closure element support. Great variability in the individual profiles of the closure element support can be created by using different deformation tools.
In particularly advantageous fashion, the armature can itself serve directly as the closure element support, so that together with the valve closure element a two-part valve needle is present. A valve needle of this kind is particularly easy and economical to manufacture, and because of the reduced parts count has only the join to be made between the valve closure element and closure element support.
REFERENCES:
patent: 4483485 (1984-11-01), Kamiya
patent: 4552312 (1985-11-01), Ohno et al.
patent: 4944486 (1990-07-01), Babitzka
patent: 4967966 (1990-11-01), Babitzka
patent: 5199648 (1993-04-01), Fujikawa
patent: 5820031 (1998-10-01), Reiter et al.
patent: 5875975 (1999-03-01), Reiter et al.
patent: 6045116 (2000-04-01), Willke et al.
patent: 38 31 196 (1990-03-01), None
patent: 40 08 675 (1991-09-01), None
patent: 62-087661 (1987-09-01), None
Kenyon & Kenyon
Morris Lesley D.
Robert & Bosch GmbH
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