Electromagnetic switching device

#The present invention relates to an electromagnetic switching device. In particular, the present invention relates to an electromagnetic switching device which is provided with a bearing sleeve, which accommodates a magnetic armature, a bearing and a pressure pin guided via the bearing.

#The present invention also relates to a method for manufacturing an electromagnetic switching device.

#In known electromagnetic switching devices, the seal is established, for example, by introducing O ring seals or by media-tight extrusion coating of the coil. One disadvantage of the arrangements known from the prior art is that an increased assembly complexity and thus also higher costs are caused by the additionally required components. The risk, which should not be underestimated, also exists that fluctuations arising during the injection molding process may result in leaks.

#FIG. 1 shows a sectional representation of an electromagnetic switching device according to the prior art;

#FIG. 2a shows a sectional representation of a first specific embodiment of the electromagnetic switching device, in which the electromagnet casing, the bearing sleeve and the pole core are formed as a one-piece component;

#FIG. 2b shows a sectional representation of the one-piece component according to the first specific embodiment;

#Identical reference numerals are used for the same elements or elements having the same function. Furthermore, for the sake of clarity, only reference numerals which are necessary for describing the particular figure are shown in the individual figures. The illustrated specific embodiments only represent examples of how the electromagnetic switching device according to the present invention may be designed and do not represent a final limitation of the present invention.

#FIG. 1 shows an electromagnetic switching device 10 according to the prior art. Bearing sleeve 11, which accommodates magnetic armature 13, is connected to cup-shaped housing part 50 with the aid of a welding method and is thus part of electromagnetic switching device 10. Coil 14, coil carrier 15 and yoke 16 are situated outside bearing sleeve 11. Bearing sleeve 11, cup-shaped housing part 50, coil 14, coil carrier 15 and yoke 16 are inserted into an injection mold, and extrusion-coated with a plastic compound 52, so that they are fixed in place in electromagnetic switching device 10. Cup-shaped housing part 50 is closed with the aid of a conical guiding element 51, in which a pressure pin 19 is guided. Pressure pin 19 is movable axially along an axis A.

#FIG. 2a shows an electromagnetic switching device 10 according to the present invention according to a first specific embodiment. One-piece component 100, which is made from a material with the aid of a forming process, is shown in FIGS. 2b and 2c. This component includes electromagnet casing 12, bearing sleeve 11 and pole core 17. Pole core 17 is formed on outer diameter 22 of bearing sleeve 11. Coil 14, coil carrier 15, yoke 16 and an intermediate segment 18, which separates pole core 17 and yoke 16 from each other, are inserted between bearing sleeve 11 and electromagnet casing 12. Bearing 21 in which pressure pin 19 is movably guided along axis A, and movably supported magnetic armature 13, which is closed by pressing in flux-conducting components 40, are inserted into inside 24 of bearing sleeve 11. Bearing sleeve 11 is closed on one side by a cover 23, which is also formed by the forming process.