Fluid sprinkling – spraying – and diffusing – Including valve means in flow line – Reciprocating
Patent
1992-08-03
1994-01-04
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Including valve means in flow line
Reciprocating
F02M 5108
Patent
active
052753417
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an electromagnetically operable valve as set forth hereinafter.
An electromagnetically operable valve has already been proposed in U.S. patent application Ser. No. P 38 25 135.3, U.S. Pat. No. 4,967,666, in which at least a part of the valve is surrounded by a plastic sheath, and on which an electrical connecting plug is integrally formed. However, different valve extrusion coating tools are required depending on the embodiment of the electrical connecting plug. This prevents cost-effective, flexible assembly.
ADVANTAGES OF THE INVENTION
The valve according to the invention has the advantage of simple production and assembly which permits cost-effective mass production since only a single valve extrusion coating tool is required for the different embodiments of the electrical connecting plug. As a consequence, this results in greater flexibility during assembly. Good handling capability of the plastic injection moulding, which consists of the magnet coil and the electrical connecting plug, can be named as a further advantage.
It is particularly advantageous to provide on the circumference of the inlet-side end of the fuel inlet connecting piece an annular groove whose radially extending side surfaces are formed by the plastic sheath surrounding a part of the valve, and whose groove base is formed by the circumference of the fuel inlet connecting piece.
It is also advantageous if an axial gap, in which there is arranged, by clamping-in, a non-magnetic stop plate which forms a residual air gap between the inlet-side end of the armature and the core end and which bounds the movement of the valve closing body during the valve opening process, is formed between the end surface of the core end facing the armature and a shoulder of the intermediate part.
It is likewise advantageous if the fuel inlet connecting piece exhibits a constant external diameter over its entire length.
It is particularly advantageous if the cylindrical valve seating body exhibits a constant external diameter.
A valve having the features set forth herein makes possible a compact, short structural shape of the valve.
DRAWING
An exemplary embodiment of the invention is shown in simplified form in the drawing and is explained in more detail in the following description.
FIG. 1 shows an exemplary embodiment of a valve designed according to the invention, and
FIG. 2 shows the independent plastic injection moulding which consists of the magnet coil and the electrical connecting plug.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
The electromagnetically operable valve, which is shown by way of example in FIG. 1, in the form of an injection valve for fuel injection systems of internal-combustion engines has a fuel inlet connecting piece 1, which is surrounded by a magnet coil 4, is used as a core and exhibits a constant external diameter, constructed for example by means of centreless grinding, over its entire length in order to make use of the space as well as possible. The magnet coil 4, having a coil former 2, is provided, as is shown in FIG. 2, with a plastic extrusion coating 7, an electrical connecting plug 21 being injection moulded at the same time, so that an independent plastic injection moulding is produced which contains the magnet coil 4 and the connecting plug 21. The magnet coil 4, which in the radial direction exhibits a stepped coil former 2 having a winding 13 which is stepped in the radial direction, in conjunction with the fuel inlet connecting piece 1, which exhibits a constant external diameter, makes possible a short and compact construction of the injection valve, as is explained in the following text.
A tubular metallic intermediate part 6 is closely connected to a lower core end 3 of the fuel inlet connecting piece 1, concentrically with respect to a valve longitudinal axis 5, by welding, and at the same time engages partially axially around the core end 3 by means of an upper cylindrical section 41. The stepped coil former 2 engages partially around the fuel inlet connecting piece
REFERENCES:
patent: 4509693 (1985-04-01), Nakai
patent: 4700891 (1987-10-01), Hans et al.
patent: 4915350 (1990-04-01), Babitzka
patent: 5002231 (1991-03-01), Reiter et al.
Babitzka Rudolf
Reiter Ferdinand
Romann Peter
Greigg Edwin E.
Greigg Ronald E.
Kashnikow Andres
Robert & Bosch GmbH
Weldon Kevin P.
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