Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – Within distinct housing spaced from panel circuit arrangement
Patent
1992-10-23
1994-11-15
Paumen, Gary F.
Electrical connectors
Preformed panel circuit arrangement, e.g., pcb, icm, dip,...
Within distinct housing spaced from panel circuit arrangement
336107, H01R 909
Patent
active
053642791
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a fastening arrangement for connections at ignition coils for motor vehicles.
Fastening arrangements in ignition coil housings with multiple-spark ignition coils for the connection of the primary windings of the ignition coils accommodated in the ignition coil housing are known in general. Together with a connection plug, these fastening arrangements, which are also known as current rails, form a constructional unit of injection-molded plastic and have two metallically blank hooks for each ignition coil which electrically contact the end portions of the primary windings. The current rails are formed by metallic strips with the hooks formed on at the ends and are inserted into a plastics injection molding die as insertion parts for the manufacture of the connection plug.
Since the current rails conduct different electrical potentials during the operation of the ignition coil, but the fastening arrangement is to be constructed so as to economize on space as much as possible, the current rails must be positioned in the injection molding die so as to be close together without contacting one another and must be fixed in such a way that their initial position is not changed as a result of the injection pressure. This fastening arrangement is expensive to produce, cost-intensive and has high reject rates.
ADVANTAGES OF THE INVENTION
It is an object of the present invention to provide a fastening arrangement for electrical connection to an ignition coil which does not have the disadvantages of the prior art fastening arrangements described above.
SUMMARY OF THE INVENTION
In keeping with this object and others which will become more apparent hereinafter, one aspect of the present invention resides, briefly stated, in a fastening arrangement for electrical connection to an ignition coil including at least one secondary winding and at least one primary winding having two end portions, which arrangement comprises a housing; a printed circuit board having a plurality of conductor paths electrically insulated from each other, each of the conductor paths having at least two bore holes for electrical connections to the primary windings; and a connection plug having an exterior side and an interior side and means for fixing the connection plug to the housing as well as a plurality of electrical contacts extending from an exterior side into the housing on an interior side. The printed circuit board is an epoxy resin circuit board. The housing is provided with a recess to accommodate the connection plug having a guide groove. The means for fixing the connection plug to the housing comprises an outer peripheral flange provided on the connection plug which has a projecting guide element pressed into the guide groove to hold the connection plug to the housing when the connection plug is fixed on the housing. The electrical contacts are electrically insulated from each other and each of the electrical contacts includes a pin on its interior end and the pins of the electrical contacts project through respective bore holes and are soldered with respective conductor paths so that the connection plug and the printed circuit board form a primary plug unit for making electrical connection to the primary coils.
This printed circuit board functions more reliably than the current rails and is produced from fiber glass-reinforced epoxy resin.
When filling the completely assembled ignition coil with casting resin, the epoxy resin of the printed circuit board can bond with the casting resin better than with the plastics injection-molded current rails. This results in improved resistance to aging of the ignition coil with respect to high temperature differences at the ignition coil during operation in a motor vehicle.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantag
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Balcarek Oskar
Betz Dieter
Grewe Werner
Nuebel Karl-Heinz
Paumen Gary F.
Robert & Bosch GmbH
Striker Michael J.
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