Primary coil former for an ignition coil, and ignition coil with such a primary coil former

Abstract

A primary coil former for an ignition coil has a winding carrier surface configured for a primary coil wound thereon. Two primary winding stops limit the winding carrier surface at first and second axial ends of the carrier surface, respectively. Two holders are formed at the first axial end, each configured for holding one end of a winding wire. Two deflection domes are formed at the second axial end, one of the domes configured for guiding a winding wire back to the winding carrier surface for a clockwise winding and the other dome configured for guiding a winding wire back to the winding carrier surface for a counterclockwise winding. A groove in the winding carrier surface receives a winding wire which leads from one of the ends of the winding carrier surface up to a gap between the two deflection domes at the opposite end of the winding carrier surface.

Claims

1. A primary coil former for an ignition coil, comprising: a winding carrier surface configured to have a primary coil wound thereon; two primary winding stops limiting the winding carrier surface at first and second axial ends of the carrier surface, respectively; two holders arranged next to one another at the first axial end of the winding carrier surface, each holder configured for holding one end of a winding wire; two deflection domes at the second axial end of the carrier surface, one of the domes configured for guiding a winding wire back to the winding carrier surface for a clockwise winding and the other dome configured for guiding a winding wire back to the winding carrier surface for a counterclockwise winding; and a groove in the winding carrier surface, the groove being adapted for receiving a winding wire which leads from one of the ends of the winding carrier surface up to a gap between the two deflection domes at the opposite end of the winding carrier surface.

2. The primary coil former according to claim 1, comprising a third holder configured for a winding wire end, said third holder being arranged next to the two holders.

3. The primary coil former according to claim 1, wherein the primary winding stop, at the first end of the winding carrier surface, comprises a passage for a first end of a primary coil winding and a second passage for a second end of a primary coil winding.

4. The primary coil former according to claim 1, wherein the deflection domes form part of one of the primary winding stops and have rear faces that face towards the winding carrier surface.

5. The primary coil former according to claim 1, wherein the primary coil former is hollow and configured for receiving a core made up of iron sheets.

6. An ignition coil comprising a primary coil former according to claim 1, and having a primary winding wound onto the primary coil former.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The above-mentioned aspects of exemplary embodiments will become more apparent and will be better understood by reference to the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

(2) FIG. 1 shows an example of embodiment of an inventive primary coil former;

(3) FIG. 2 shows the primary coil former with a primary winding in a first winding direction; and

(4) FIG. 3 shows the primary coil former with a primary winding in a second opposing winding direction.

DESCRIPTION

(5) The embodiments described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following description. Rather, the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of this disclosure.

(6) FIG. 1 shows a primary coil former for an ignition coil. The primary coil former comprises a winding carrier surface 1 for a primary coil winding 2, shown in FIGS. 2 and 3. The winding carrier surface 1 is limited in axial direction at both ends by primary winding stops 3, 4. The primary winding stops 3, 4 can, for example, be designed as a flange or a web. In a completely wound ignition coil, the first winding of the primary coil winding then abuts against one of the stops 4, and the last winding of the primary coil winding against the other stop 3.

(7) The primary coil former also comprises at least two holders 5, 6 arranged next to one another at a first end of the winding carrier surface 1. The holders 5, 6 are configured to each hold one end 7, 8 of the winding wire. The holders 5, 6 can, for example, be designed as notches, hooks or the like. In the example shown, three such holders 5, 6, 9 are arranged next to one another outside the winding carrier surface 1.

(8) The primary winding stop 3 that faces towards the holders 5, 6, 9 has two passages 11, 12 for the ends 7, 8 of the winding wire. From one of these two passages 11, 12, a groove 13 leads through the entire winding carrier surface 1 to the deflection domes 14, 15 at a second end of the winding carrier surface 1. The rear faces of the deflection domes 14, 15, facing towards the winding carrier surface 1, form part of the corresponding primary winding stop 4. The groove 13 ends between the two deflection domes 14, 15. The winding wire is led from one of the holders 6, through the corresponding passage 12 of the primary winding stop 3, in the groove 13 through the gap between the two deflection domes 14, 15, and is then, depending on the desired winding direction, curved around one or the other deflection dome 14, 15, and thus led back to the winding carrier surface 1. The winding wire is then wound around the winding carrier surface 1 until the other end of the winding wire then passes through the second passage 11 of the primary winding stop 3 facing towards the holders 5, 6, 9. This end 7 of the primary winding wire is then fixed in the relevant holder 5 or 9.

(9) FIG. 2 shows the primary coil former as described, with a primary winding in a first winding direction, while FIG. 3 shows the primary coil former with a primary winding in a second winding direction. As can be seen, the two figures differ essentially in that in one case the winding wire is guided around the left-hand deflection dome 14, and in the other case around the right-hand deflection dome 15.

(10) The primary coil former can be hollow, so to accommodate a core made up, for example, from iron sheets.

(11) While exemplary embodiments have been disclosed hereinabove, the present invention is not limited to the disclosed embodiments. Instead, this application is intended to cover any variations, uses, or adaptations of this disclosure using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.

LIST OF REFERENCE SYMBOLS

(12) 1 Winding carrier surface 2 Primary coil winding 3 Primary winding stop 4 Primary winding stop 5 Holder 6 Holder 7 Winding wire end 8 Winding wire end 9 Holder 11 Passage 12 Passage 13 Groove 14 Deflection dome 15 Deflection dome