Electromagnetically controlled valve

Details Electromagnetically controlled valve Electromagnetically controlled valve

2000-01-12

2001-03-13

Donovan, Lincoln (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

C335S251000, C335S255000, C335S257000, C251S129150

Reexamination Certificate

active

06201461

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an electromagnetically actuable valve, in particular a valve for fuel injection systems of internal combustion engines.
BACKGROUND OF THE INVENTION
A fuel injection valve that is electromagnetically actuable, and consequently possesses a magnetic circuit that comprises at least a magnet coil, a core, an armature, and an external pole, is described in German Patent No. 195 03 821.
In the valve described in German Patent No. 195 03 821, the core and a connector part of a valve tube are joined directly to one another via a magnetic throttling point. It is advantageous in this context to configure the entire valve tube integrally, so that it extends over the entire length of the valve. One advantage of the throttling point, which for example is only approximately 0.2 mm thick, lies in the secure sealing of the valve, so that O-rings—which are problematic in terms of leak measurement and valve cleaning—can be dispensed with. In high-pressure valves with maximum pressures in the range, for example, of approximately 10 to 12 MPa (100 to 120 bar), a strength problem however, does occur at the relatively thin-walled throttling point
10
.
SUMMARY OF THE INVENTION
The electromagnetically actuable valve according to the present invention has the advantage that it utilizes the advantages—those specific to a magnetic circuit and relating to sealing problems and production engineering—of the design of the valve tube with a thin-walled throttling point, and at the same time eliminates the strength problems of the existing art.
It is particularly advantageous to either produce the annular insert from electrically nonconductive material or configure it with an interruption at at least one point and mount it in electrically insulated fashion. With this feature it is possible to prevent the occurrence of eddy currents in the annular insert, which is located at least partially within the influence region of the magnetic field of the magnet coil, in the presence of a changing magnetic field, since such currents have a negative effect on switching times (energizing and closing times).
A particularly advantageous embodiment of the annular insert consists in configuring it from two concentric rings, which are electrically insulated from one another and each have at least one slot, so that electrically conductive material, for example an austenitic metal having good strength properties and dimensional stability properties, can also be used for the insert. The two rings are preferably arranged in such a way that their slots are positioned with a 180° offset from one another, in order to improve or maintain the mechanical stability of the design.
It is also further advantageous to fill up a gap between the throttling point and the annular insert with an adhesive. This allows larger permissible tolerances for the corresponding diameters of the individual components, as well as more economical manufacture.


REFERENCES:
patent: 5494225 (1996-02-01), Nally et al.
patent: 5687468 (1997-11-01), Hans et al.
patent: 6042082 (2000-03-01), Graner et al.
patent: 38 31 196 (1990-03-01), None
patent: 195 03 821 (1996-08-01), None

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