JPH0644531B2 - Winding body - Google Patents

Description

The present invention relates to a winding body of a type in which a winding start end is connected to a terminal outside the bobbin when winding the coil around a bobbin, for example, an ignition coil, and Specifically, it relates to an improved structure for winding the winding start end around a terminal and winding a coil around a bobbin with an automatic winding machine.

[Conventional technology]

In this kind of conventionally known winding body, the terminal is merely a columnar body, and the winding start end is wound around this terminal,
Next, when winding the coil on the bobbin, if this is done with an automatic winding machine, in order to give the winding head a sufficient stroke to properly wind the winding start end around the terminal, make the axial length of the terminal It is customary to make it longer or to separate this terminal considerably from the bobbin.

[Problems to be solved by the invention]

However, in recent years, various restrictions on mounting have come to be added to this kind of winding body, and as described above, there are cases where it is not possible to lengthen the axial length of the terminal or to considerably separate the terminal position from the bobbin. It has started to occur.

In view of the above points, the present invention has an object to provide a winding body that can shorten the length of the terminal itself and the distance between the terminal and the bobbin.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention has devised a structure of a terminal around which a winding start end of a coil is wound. This terminal has a top portion inclined in the axial direction of the bobbin and a lower side surface of the top portion protruding in the axial direction of the bobbin. Has a coil wire receiving portion, a groove recessed in the bobbin axial direction from the upper side surface of the top portion, and a neck portion narrowly formed by the groove so that the winding start end is wound around the neck portion. To

[Action]

As a result, even when winding with an automatic winding machine, each part of the terminal functions conveniently, and the winding start end of the coil can be accurately wound around this terminal, and the length of the terminal itself and the terminal and bobbin The separation distance can be shortened.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows an application example as an ignition coil, and particularly shows a state of a winding body. Reference numeral 1 denotes a rod-shaped iron core having mounting holes 1a at both ends, and magnetic plates such as iron plates are laminated on the end plate 1b. One end of the end plate 1b is integrally formed with a terminal 2 as shown in FIG. The terminal 2 is electrically connected to the iron core 1. A bobbin 3 made of an insulating material such as resin is integrally molded in the center of the iron core 1 by injection molding means. The bobbin 3 has first flanges 31a and 31b at both ends thereof.
Second reel 3 having a plurality of flanges 32c in the intermediate portion in addition to the reel 31 and the flanges 32a and 32b at both ends.
2 and a tubular portion 33 projecting in the axial direction and surrounding the iron core 1. A plate-shaped portion 34 is further connected to the tubular portion 33, and the plate-shaped portion 34 has a first connection piece. 4a and second
A wire connecting member 4 having an L-shaped wire connecting piece 4b and the wire connecting piece 4b is planted by insert molding means. A notch 35 is provided on one flange 31a of the first winding frame 31.

The terminal 2 protrudes from the tubular portion 33 except for the root portion thereof, and is in a relation of standing upright in parallel with the flange 31a in the vicinity of the flange 31a. As shown in an enlarged view in FIG. The top 21 having a curved inclined surface 21a inclined in the axial direction, and the curved inclined surface 21
The coil wire receiving portion 22 protruding in the bobbin axial direction from the lower side surface of a, the U-shaped groove 23 recessed in the bobbin axial direction from the higher side surface of the curved inclined surface 21a, and this groove 2
And a neck portion 24 formed narrowly by 3. The neck portion 24 is located slightly above the receiving portion 22.

As shown in FIG.
The secondary coil 5 is wound, and a secondary coil (not shown) is wound on the second winding frame 32 to complete the ignition coil. The winding start end 5a of the primary coil 5 is a flange 31a.
It is exposed to the outside of the bobbin from the notch portion 35 and is wound around the neck portion 24 of the terminal 2 and its winding end 5b.
Is wound around the second connection piece 4b of the L-shaped connection member 4. 50 is a coil wire. The winding end 5a, the winding end 5b, the neck 24 of the terminal 2 and the winding portion of the connection piece 4b are soldered as necessary.
Ensure good mechanical and electrical connections. The first connection piece 4a of the L-shaped connection member 4 serves as an input terminal from the outside, and is connected to the power supply by connecting the interrupter. Thereby, the power source → interrupter → first connection piece 4 of the L-shaped connection member 4
a → second connection piece 4b → winding end piece 5b → primary coil 5 →
A circuit of winding start end 5a → terminal 2 → iron core 1 → ground is formed.

Then, the case where the primary coil 5 is wound around the terminal 2 and the bobbin 3 is wound around the winding frame 31 by an automatic winding machine will be described with reference to the schematic diagram of FIG. The winding nozzle 7 is located above the terminal 2 from the position 7a to the position 7b.
As shown by arrow A, the position moves along the flange 31a in the direction perpendicular to the bobbin axial direction. At this time, the coil winding 50 that forms the winding start end 5a fed from the nozzle 7
Since the top portion 21 of the terminal 2 has the inclined surface 21a, it can be smoothly slid and received by the coil wire receiving portion 22. That is, the coil wire 50 is reliably guided to the bobbin side of the terminal 2 by the inclined surface 21a, and the coil winding 50 does not fall to the terminal root portion by the receiving portion 22.

Next, the winding nozzle 7 moves from the 7b position to the 7c position by the arrow B.
It makes a U-turn as shown in the figure, and then turns from the 7c position to the 7d position as shown by arrow C and goes straight. In this process, the coil winding was placed on the receiving portion 22, so that the U-shaped groove 2 was well formed.
3 and wraps around the neck portion 24 accurately.

As a result, the work of winding the winding start end 5a around the terminal 2 is completed, and the winding nozzle 7 further moves from the 7d position to the 7e position in the bobbin axial direction as indicated by the arrow D, and the winding frame 31
The primary coil is wound around.

Although the above-mentioned examples illustrate the preferred embodiments of the present invention, the present invention is not limited thereto and can be variously modified, and other main examples of the present invention will be listed below.

(1) The terminal 2 may be provided separately from the iron core 1 as a separate member, and in this case, the overall shape is not limited to a plate shape, and an appropriate shape such as a columnar shape or a columnar shape can be selected.

(2) The inclined surface 21a of the terminal 2 is optimally a curved surface as shown in the figure, but it may be a linearly inclined surface. Similarly, the groove 23 may have a V-shape other than the U-shape, a U-shape, or the like.

(3) The coil wire receiving portion 22 of the terminal 2 may be connected to the root portion instead of being projected in a mountain shape as illustrated.

(4) In addition, although the present invention is applied to the ignition coil in the above-described embodiments, the present invention is not limited to the ignition coil and can be applied to various winding bodies using bobbins.

〔The invention's effect〕

As described above, in the present invention, by devising the structure of the terminal, the apex inclined in the bobbin axial direction, the coil wire receiving portion protruding in the bobbin axial direction from the lower side surface of the apex, Since the groove that dents in the axial direction of the bobbin from the higher side of the top and the neck that is narrowly formed by this groove are provided, the winding start end of the coil can be accurately wound around this neck, and the length of the terminal itself There is an excellent effect that the separation distance between the pod and the bobbin can be shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a winding body of the present invention before winding, FIG. 2 is an enlarged view of a terminal portion of the winding body of the present invention, and FIG. 3 is a winding body of the present invention. FIG. 4 is a schematic view for explaining a winding process of the above-described winding body of the present invention, showing a perspective view of a main part showing a state after winding. 2 ... Terminal, 21 ... Top, 21a ... Slope,
22 ... Coil wire receiving part, 23 ... Groove, 24 ... Neck part, 3 ... Bobbin, 31a ... Flange, 35 ... Notch part, 5 ... Coil, 5a ... Winding start end.

Claims (1)

[Claims] 1. A bobbin having flanges at both ends and a notch in at least one flange, a coil wound around the bobbin and having a winding start end exposed from the notch, and a flange having the notch. A terminal on which the winding start end is wound up in parallel with the flange in the vicinity thereof, and the terminal has a top portion inclined in the axial direction of the bobbin, and a coil element protruding in the axial direction of the bobbin from a lower side surface of the top portion. It has a wire receiving portion, a groove recessed in the bobbin axial direction from the upper side surface of the top portion, and a neck portion narrowly formed by this groove, and the winding start end is wound around the neck portion. Characteristic winding body.