High voltage connection to ignition coils

Details High voltage connection to ignition coils High voltage connection to ignition coils

1993-02-26

1996-08-06

Thomas, Laura

Inductor devices

Winding with terminals, taps, or coil conductor end...

336107, 336 96, H01F 2704

Patent

active

055437729

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to ignition coils, and, more particularly, to ignition coils having a high-voltage connection device or means for connecting an ignition cable to a secondary winding of the ignition coil.
An ignition coil is known, comprising a primary winding embedded in a cast resin portion, a secondary winding embedded in the cast resin portion and a high-voltage electrical connection device. The high-voltage electrical connection device includes at least one contact part electrically connecting a high-voltage end of the secondary coil to a conducting end portion of an ignition cable and a retaining part protruding beyond the cast resin portion and provided with a throughgoing aperture. A high-voltage connection of an ignition cable to an ignition coil is known from the DE-OS 35 06 929, in which the ignition cable end is introduced into an aperture of a connection tower and contacted by a pointed contact pin, with the contact pin being electrically connected via a contact wire to the end of a high-voltage winding. The connection tower, into which the ignition cable is inserted, is sealed against moisture by a shroud.
It is further common practice to use plug-type contacts for the connection of the high-voltage cable to the high-voltage winding. These plug-type contacts may be insulating plastic molded pieces. Such plastic molded pieces do not always guarantee a low-loss transmission, particularly with extremely high voltages, where moisture has penetrated, for example. In order to ensure safe handling of the high voltage, the plastic molded pieces would need to be of larger dimension. However, that would have the disadvantage that the connection area would have significantly larger dimensions and that the weight of the ignition unit would also increase.
The aim is to develop a high-voltage connection which removes this disadvantage and ensures, with the minimum weight possible, a low-loss transmission of the high voltage from the ignition coil to the ignition cable.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide an ignition coil having an improved high-voltage connection device for connecting the secondary winding to at least one ignition cable.
According to the invention, the ignition coil comprises a cast resin portion; a primary winding embedded in the cast resin portion; a secondary winding embedded in the cast resin portion; at least one contact part electrically connecting the high-voltage end of the secondary coil to a conducting end portion of an ignition cable; a retaining part having a throughgoing aperture for receiving the ignition cable, the retaining part protruding from the cast resin portion; a shrink hose acting as a sealing means surrounding the end portion of the ignition cable concentrically, extending through the aperture of the retaining part and beyond the retaining part; and a shrink sleeve acting as additional sealing means concentric with the end portion of the ignition cable and connected with the end portion of the ignition cable at least in one end region thereof and with the retaining part at least in another end region thereof so as to seal against moisture.
In contrast, the ignition system in accordance with the invention has the advantage that the high-voltage connection has small dimensions and hence a low weight and that the electrical point well protected against moisture by multiple overlapping of various components.
Various embodiments of the above-described ignition coil according to the invention are possible. Of particular advantages is the preferred embodiment in which a cast resin/air/cable transition region is replaced by a cast resin/retaining part/cable transition region. Since the flexible ignition cable does not therefore directly emerge from the casting compound, the mechanical load is low at this point.


BRIEF DESCRIPTION OF THE DRAWING

The objects, features and advantages of the present invention will now be illustrated in more detail by the following detailed description, refe

REFERENCES:
patent: 2930011 (1960-03-01), Wigert et al.
patent: 4161776 (1979-07-01), Onoue
patent: 4408176 (1983-10-01), Nakamura et al.
patent: 4587942 (1986-05-01), Burson
patent: 4683454 (1987-07-01), Vollmer et al.
patent: 4740773 (1988-04-01), Buchschmid et al.
patent: 4931728 (1990-06-01), Hata et al.

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