Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1998-08-12
1999-12-07
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
25112915, 25112921, 335255, B05B 130
Patent
active
059969113
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND INFORMATION
The present invention relates to an electromagnetically actuated valve. Several electromagnetically actuated valves, in particular fuel injection valves, are known where components subject to wear are provided with wear-resistant coatings.
German Published Patent Application No. 29 42 928 describes the application of wear-resistant diamagnetic material coatings on parts subject to wear, such as armatures and nozzle bodies. These coatings, applied in accurately dimensioned layer thicknesses, are used to limit the stroke of the valve, thereby minimizing the effect of residual magnetism on the movable parts of the fuel injection valve.
European Published Patent Application No. 0 536 773 also describes a fuel injection valve where a hard metal coating is applied by electroplating to the armature of its cylindrical peripheral surface and annular stop surface. This coating, made of chromium or nickel, has a thickness of 15 to 25 .mu.m, for example. As a result of electroplating, a slightly tapered layer thickness distribution is formed with a minimally thicker layer achieved at the outer edges. The layer thickness distribution of coatings formed by electroplating is physically predefined and can barely be influenced.
SUMMARY OF THE INVENTION
The valve according to the present invention has the advantage that a cost-effective stop region is created in a simple manner. According to the present invention, in which the wear-protection layer applied on the stationary core is thicker than the wear-protection layer applied on the axially moving armature, it is also possible to increase the magnetic force of the electromagnetic circuit of the valve. Since in the case of electroplated layers leakage is reduced at smaller set values of the layer thickness, smaller effective residual air gap fluctuations occur in the core/armature area. Thus, the fluctuations of the injected fuel amount q.sub.dyn are advantageously reduced, while the minimum operate voltage values are increased.
Wear on the movable armature is considerably less than on the stationary core, and thus a much thinner wear protection layer can be applied to the armature without affecting the quality, which results in a non-negligible coating material savings. Furthermore, coating times are advantageously reduced, in particular when coating the armature. Material savings result in cost reduction, which is further enhanced by the reduced disposal costs for the electroplating baths.
Another advantage results from the reduced scatter of the armature diameter, which favorably affects the wear characteristics due to the resulting reduced guidance play.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a fuel injection valve according to the present invention.
FIG. 2 shows a detail of the injection valve stop in the region of the core and armature provided with wear protection layers.
DETAILED DESCRIPTION
The electromagnetically actuated valve shown as an example in FIG. 1, in the form of an injection valve for fuel injection systems of compressed-mixture, externally ignited internal combustion engines, has a core 2, serving as a fuel inlet nozzle, surrounded by a magnetic coil 1. Core 2 is tubular in shape, for example, and has a constant external diameter over its entire length. A bobbin 3 that is stepped in its radial direction carries the winding of magnetic coil 1 and, in conjunction with core 2, allows the injection valve to have a particularly compact design in the area of magnetic coil 1.
Concentrically with longitudinal valve axis 10, tubular metallic intermediary piece 12 is tightly connected to the lower end 9 of core 2, for example, by welding, and partially surrounds lower core end 9 axially. Stepped bobbin 3 partially surrounds core 2 and, with one step 15 having a larger diameter, intermediary piece 12, at least in part, axially. Downstream from bobbin 3 and intermediary piece 12, there is a tubular valve seat carrier 16, which is firmly connected to intermediary part 12, for example. A longitudinal bore hole 17 runs concen
REFERENCES:
patent: 4527744 (1985-07-01), Hafner et al.
patent: 4875658 (1989-10-01), Asai
patent: 5036885 (1991-08-01), Miura
patent: 5732888 (1998-03-01), Maier et al.
patent: 5749527 (1998-05-01), Fujikawa et al.
patent: 5769391 (1998-06-01), Noller et al.
Gesk Markus
Keim Norbert
Stilling Joachim
Kashnikow Andres
Nguyen Dinh Q.
Robert & Bosch GmbH
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