JPS6214657Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a device for automobiles, housing equipment, etc. that is divided into a plurality of winding parts by a plurality of collar pieces provided at appropriate intervals in the length direction of the core. This invention relates to improvements to split-wound ignition coil bobbins.

Figures 1 and 2 show a conventional split-wound ignition coil bobbin, in which the core 6 and the flange piece 5... are similar to each other with the same geometric center even if they are concentric or not circular. It has a shape, and the tsuba piece 5
... has a guide groove 4 for passing the wire from one winding section 3 to the next winding section 3 during winding work.
is cut out.

That is, once the wire has been wound a predetermined number of turns in one winding section 3, it is placed into the guide groove 4 and moved to the next winding section 3 by hooking the wire onto the inner wall of the groove. It is to make it.

However, since the outer diameter of the wire 5 to be wound varies by about 10%, the partial winding 2
The height H also sometimes deviated by about 20% from the expected value at the time of design.

For this reason, when the partial winding 2 is shifted to become thicker, the effective depth De of the guide groove 4 becomes shallower, as shown in FIG. It has become impossible to enter the groove or to be stably held, resulting in a significant decrease in workability and productivity.

According to the conventional thinking, to prevent this, the guard piece 5
It is necessary to ensure that the effective depth De of the groove 4 is a sufficient depth by making the size of the bobbin a large diameter with a margin in mind, but if this is done, another drawback is that the entire bobbin ends up becoming large. I will invite you.

This proposal was made in view of the above, and it is a split-wound ignition coil bobbin that can guarantee the effective depth of the guide groove with a simple structure and improve workability and productivity without increasing the size of the product. This is what we intend to provide.

FIG. 3 shows a first embodiment of the present invention, and the corresponding symbols correspond to components in the conventional configuration shown in FIGS. Protrusions 9a and 9b are provided to extend the guide groove outward from the portion 5.

By doing this, even if the winding thickness H of the winding deviates to a thicker value, the diameter of the entire collar piece will not be increased.
A sufficient effective groove depth De will be ensured. Conversely, even if the collar piece 5 has the minimum necessary small diameter, the effective groove depth of the guide groove 4 is designed based on the outward protrusion length of the projections 9a and 9b, regardless of the diameter of the collar piece. Since the depth can be made as deep as necessary, the workability of winding the crossover wire 7 by placing it in the groove and hooking it onto the inner wall surface of the groove is significantly improved.

However, the protrusions provided on the flange piece 5 at the guide groove opening need not be one each, 9a and 9b, on both sides of the opening as in the embodiment shown in the third figure, but four protrusions 9a and 9b on both sides of the opening.
As shown in the figure or the fifth figure, either one side (9a
or 9b) may also serve the purpose depending on the required effective groove depth. Note that the shape of the collar piece and the bobbin are not limited to round shapes, and may be square or other shapes.

As described above, according to the present invention, the effective depth of the guide groove can be secured to the required length without increasing the size of the entire collar piece or even the entire bobbin, and workability and productivity can be improved. It is even possible to make the collar piece smaller in diameter or smaller than before.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams of the configuration of a conventional split-wound ignition coil bobbin, and FIGS. 3, 4, and 5 are schematic configuration diagrams of each embodiment of the present invention. In the figure, 1 is a collar piece, 2 is a partial winding, 3 is a winding part,
4 is a guide groove, 7 is a crossover wire, 9a, 9b are protrusions,
It is.

Claims (1)

[Claims for Utility Model Registration] The core is divided into a plurality of winding parts by a plurality of collar pieces provided at intervals in the length direction, and there is a transition between adjacent winding winding parts. A split-wound ignition coil bobbin in which a guide groove for guiding the wire is cut out in the flange piece, and the effective depth of the guide groove is directed outward into the flange piece at the opening of the guide groove. A split winding type ignition coil bobbin characterized by being provided with an extending protrusion.