Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1995-08-09
1998-03-31
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
25112915, 25112921, F02M 5100
Patent
active
057328889
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetically operable valve.
BACKGROUND INFORMATION
A variety of electromagnetically operable valves, in particular fuel injection valves, are already known, in which wearing component parts are provided with wear resistant coatings.
From German Patent Application No. DE-A 29 42 928, it is already known to apply wear resistant diamagnetic material coatings to wearing parts such as armatures and nozzle bodies. These applied coatings serve to limit the lift of the valve needle, whereby the effects of the residual magnetism upon the moving parts of the fuel injection valve are minimized.
From German Patent application No. DE-A 32 30 844, it is likewise known to provide the armature and impact face of a fuel injection valve with wear resistant surfaces. These surfaces can be nickel-plated, for example, i.e. provided with an additional coating, or nitrided, i.e. hardened by impregnation with nitrogen.
In addition, it is already known from German Patent application No. DE-A 37 16 072, for parts of an injection valve which are particularly prone to wear and corrosion, to use molybdenum hard coatings which are thinly configured and can be subsequently worked with diamonds.
In German Patent application No. DE-A 38 10 826, a fuel injection valve is described in which at least one impact face is designed in the shape of a spherical cap in order to attain an extremely exact air gap, there being configured centrally on the impact face a round-body insert made from nonmagnetic, high-strength material.
From European Patent Application No. EP-A 0 536 773, a fuel injection valve is likewise known in which there is applied to the armature by galvanization, to its cylindrical peripheral surface and annular impact face, a hard-metal coating. This chromium or nickel coating possesses, for example, a thickness of 15 to 25 .mu.m. As a result of the galvanic coating procedure, a slightly wedged coating thickness distribution is obtained, a minimally thicker coating being attained at the outer edges. As a result of the galvanically deposited coatings, the coating thickness distribution is physically predefined and barely influenceable. After a certain running time, the impact face widens undesirably as a result of wear, thereby giving rise to changes in the pull-in time and release time of the armature.
SUMMARY OF THE INVENTION
The electromagnetically operable valve according to the present invention, has the advantage relative to the above that at least one of the mutually impacting component parts is shaped such that, once a wear resistant surface has been generated, there is assurance that the impact face, even after a lengthy running time, will not be undesirably enlarged as a result of wear, so that the pull-in and release times of the movable component part remain virtually constant. This is achieved by the fact that at least one of the mutually impacting component parts, even before the wear resistance has been generated, possesses a wedged surface. This wedged surface can be accurately adapted in each case to different given circumstances in order to obtain a magnetic and hydraulic optimum.
It is particularly advantageous to create the extremely accurate surface shape, at least of one of the impacting component parts, by mechanical means using a ground counterbore. Very precise dimensions are thereby attainable. Using tools which have been very accurately ground, narrower production tolerances than previously achieved are able to be respected, so that, when the injection valve is running, a very small variance in the pull-in and, in particular, the release time of the armature is obtained.
It is additionally advantageous that, as a result of a wedged armature and/or core, hydraulic sticking is fully precluded, since, even where the coatings are by and large evenly deposited, the wedging remains in any event present. The coatings on at least one of the impacting component parts possess, namely, only a fraction of the wedging of the component parts them
REFERENCES:
patent: 4527744 (1985-07-01), Hafner et al.
patent: 4875658 (1989-10-01), Asai
Heyse Jorg
Keim Norbert
Maier Martin
Reiter Ferdinand
Ganey Steven J.
Kashnikow Andres
Robert & Bosch GmbH
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