Inductor devices – With outer casing or housing – Potted type
Patent
1986-10-10
1988-04-26
Kozma, Thomas J.
Inductor devices
With outer casing or housing
Potted type
336107, 336192, 439863, H01F 1510, H01F 2704
Patent
active
047407735
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an ignition device with a high-voltage terminal including a tubular post for receiving an ignition cable and a contact pin having its rear end enclosed at a base of the opening of the tubular post, and a coil form arranged in a housing and carrying an ignition winding. In a known high-voltage terminal of an ignition device (DE-OS No. 32 05 714) the winding end of the secondary winding of an ignition armature is twisted repeatedly and then guided through a borehole in the terminal post of an ignition cable. A contact pin is pressed into the borehole by its rear end and in so doing makes contact with the winding end in the circumferential area. The twisted winding end projecting from the borehole is then removed and the housing container with the primary and secondary windings of the ignition armature is potted with casting resin. The end of the ignition cable can now be placed on the contact pin which is arranged in the borehole of the terminal post.
Such solutions are involved and time consuming to produce insofar as the twisted winding end of the high-voltage winding must be introduced in the terminal post by hand. With the present solution it is endeavored to form the high-voltage terminal in such a way that the very thin wire end of the high-voltage winding is electrically connected with the contact pin in the terminal post by means of working steps which are to be carried out mechanically.
ADVANTAGES OF THE INVENTION
The high-voltage terminal of the ignition device with the characterizing features of the main claim, according to the invention, in contrast to the known solution, has the advantage that the thin wire end of the high-voltage winding need no longer be fastened at the coil form for protection against an unintentional unwinding, but, rather, it can immediately be mechanically wound around the solid wire inserted in the coil form so as to make electrical contact with it. Another advantage consists in that a reliable contact of the solid wire with the contact pin is effected at the same time as the contact pin is pressed into the borehole of the terminal post. A twisting of the winding end is no longer necessary, since in this solution there is no longer the risk that the very thin winding wire will be squeezed off when the contact pin is pressed in.
Advantageous developments and improvements of the features indicated in the main claim are possible by means of the measures mentioned in the subclaims. It is particularly advantageous that the end area of the solid wire received in the housing recess be bent at a right angle to the end fastened in the coil form. By means of this measure it is ensured that the solid wire is received at the correct place in the housing recess during the mechanical insertion of the coil form with the primary and secondary windings in the housing. In an advantageous manner the housing recess is molded into a housing container receiving the primary and secondary windings.
DRAWING
Two embodiment examples of the invention are shown in the drawing and explained in more detail in the following description.
FIG. 1 shows a magneto ignition system with an ignition armature in whose high-voltage terminal an ignition cable is inserted,
FIG. 2 shows a longitudinal section through the high-voltage terminal in enlarged scale and,
FIG. 3 shows a portion of the housing container, with the coil form inserted therein, in a top view,
FIG. 4 shows, as second embodiment example, a housing container with a cross section through the high-voltage terminal in enlarged scale and
FIG. 5 shows a portion of the housing container with the coil form in a top view.
DESCRIPTION OF THE EMBODIMENT EXAMPLES
The magneto ignition system for an internal-combustion engine, shown in FIG. 1, consists of an ignition armature 10 and a revolving magnet system 11. The magnet system 11 comprises a permanent magnet 12 and two pole shoes 13 arranged to the side of the latter. The permanent magnet 12 and the pole shoe 13 are inserted at the circumference of a disk 14, wh
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Buchschmid Emil
Huttinger Manfred
Schmid Hans-Dieter
Steffen Horst-Gunter
Kozma Thomas J.
Robert & Bosch GmbH
Striker Michael J.
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