JPS595955Y2 - Bobbin for ignition coil - Google Patents

Description

[Detailed description of the invention] The present invention is based on two ignition coils used in an ignition system for an internal combustion engine.
This relates to the bobbin on which the next winding is wound.

Conventionally, when winding the secondary winding of an ignition coil, holes 1a, 1a are provided in a cylindrical bobbin body 1 made of resin or the like, and a lead wire 2 made of stranded wire is passed through the holes 1a, 1a and wound around the bobbin. After the winding start end 3 of the secondary winding is soldered to the end 2a of the node wire 2, the secondary winding is wound around the outer periphery of the bobbin using a winding machine.

However, in this method, first, the work of fixing the lead wire 2 to the bobbin 1 cannot be mechanized, so the work is troublesome and time-consuming, and the work efficiency is reduced.

Also, since the secondary winding is very thin (0.06φ or less), in order to reliably connect the winding start end 3 of the secondary winding to the lead wire 2, it is necessary to connect the winding start end 3 to the lead wire 2. Since it is necessary to perform soldering after winding the coil several times, this connection work is also time-consuming and has the disadvantage of increasing the manufacturing cost of the ignition coil.

There is also a terminal fitting that is attached to the bobbin and the beginning of the secondary winding is soldered to this terminal fitting, but in this case, if an external force is applied to the terminal fitting during the assembly work of the ignition coil, the terminal fitting There was a drawback that the winding would move and the beginning of the secondary winding would break.

The purpose of this invention is to provide a conductive foil on the outer periphery of the bobbin body for soldering the beginning of the secondary winding, and to mechanically connect this conductive foil to a lead plate provided on the inner periphery of the bobbin. The object of the present invention is to provide a bobbin for an ignition coil that eliminates the above-mentioned drawbacks.

The bobbin of the present invention will be explained in detail below with reference to the illustrated embodiments.

Referring to FIGS. 2 to 4, an embodiment of the present invention is shown, and in these figures, reference numeral 10 denotes a cylindrical bobbin body made of resin.

On the outer circumferential surface of the bobbin body 10, a conductive foil 11 made of a conductive material such as copper is disposed toward one end in the axial direction.
The conductive foil 11 is disposed so as to cover at least a part of the area where the secondary winding is wound.
It is curved and arranged so as to follow the outer peripheral surface of 0.

A strip-shaped lead plate 12 made of a conductive material is arranged at a position corresponding to the conductive foil 11 on the inner peripheral surface of the bobbin body 10, with one end thereof protruding from the bobbin body.

This lead plate 12 has claws 13.13 having sharp tip portions 13a, 13a by cutting and raising a part of the lead plate 12.
are integrally formed.

These claws penetrate the bobbin main body 10 and the conductive foil 11 at the portion covered by the secondary winding when the secondary winding is wound, and the tip portions 13 a , 13 a penetrate the conductive foil 11 . The conductive foil 11 and the lead plate 12 are bonded to each other by being bent to the side.

In this embodiment, a claw 13 integrally provided on the lead plate 12 is used as a coupling means for coupling the lead plate and the conductive foil, but this coupling means passes through the bobbin body and connects the lead plate and the conductive foil. Any material may be used as long as it can be bonded to the foil, and is not limited to the above example.

For example, the lead plate and the conductive foil may be connected by an eyelet-like connecting means provided separately from the lead plate 12.

When the bobbin is structured as described above, the 2
Since the winding start end of the next winding can be soldered, there is no need to wind the lead wire around the bobbin as in the conventional method.
The stopping time of the winding machine before starting the next winding can be shortened.

Further, since the conductive foil and the lead plate are attached by caulking, the attachment work can be easily mechanized, and the bobbin can be manufactured easily.

It is also conceivable to provide only the lead plate 12 without providing the conductive foil 11 as in the above embodiment, and to solder the winding start end of the secondary winding to this lead plate.

However, in this case, after winding the secondary winding, there is a need to fit the secondary winding around the outer periphery of the primary winding, and to attach the winding end of the primary winding to the lead plate 12. When performing soldering work, an external force acts on the lead plate 12, causing the lead plate to be displaced and the winding start end of the secondary winding to be disconnected.

However, as in the above embodiment, when the conductive foil 11 is provided and the winding start end of the secondary winding is soldered to this conductive foil, the conductive foil is easily deformed, so that the lead plate 12 may be displaced. However, the displacement of the lead plate only deforms the conductive foil near the coupling means (claw 13 in the above example), and the displacement is transmitted to the soldered part between the winding start of the secondary winding and the conductive foil. There isn't.

Therefore, it is possible to prevent the winding start of the secondary winding from being disconnected due to an external force applied during the assembly work of the ignition coil.

Figure 5 shows an example of an ignition coil manufactured using the bobbin of the present invention, in which 15 is a ■-shaped iron core;
16 is a primary coil wound on the iron core 15 with an insulating paper 17 interposed therebetween.

A secondary winding 18 is attached to the conductive foil 11 on the outer periphery of the bobbin body 10.
The winding start end 18a of the conductive foil 1 is directly soldered.
A secondary winding 18 is wound around the outer periphery of the bobbin body 10 including the bobbin main body 10.

The winding start end 18a of the secondary winding is electrically connected to the lead plate 13 through the claw 13, and the lead plate 13 is connected to the conductor 19.
It is connected to the external terminal 20 via.

The lead plate 13 also has a winding end 16 of the primary winding 16.
a is soldered to the end of the primary winding 16 and the secondary winding 1.
The winding start of 8 is commonly connected to the external terminal 20.

An L-shaped terminal fitting 21 is fixed to the outer periphery of the secondary winding 18 by taping or the like, and the end portion 18b of the secondary winding 18 is soldered to this terminal fitting.

The core wire of a high voltage cord 22 is also soldered to the terminal fitting 21, and the 21st winding 18 is connected to a spark plug (not shown) by this high voltage cord 22.

The beginning of the primary winding 16 is grounded to the iron core 15.

Further, 23 indicates an outer cover of the ignition coil made of resin or the like.

As described above, according to the bobbin of the present invention, since the winding start of the secondary winding wire can be soldered directly to the conductive foil, it is possible to avoid the work of winding the lead wire around the bobbin as in the past. There is no need to wind the starting end around the lead wire, improving work efficiency and reducing manufacturing costs.

Further, there is an advantage that the winding start end of the secondary winding can be prevented from being disconnected due to an external force acting during the assembly work of the ignition coil.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional example, Fig. 2 is a plan view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along the line III in Fig. 2, and Fig. 4 is the right side of Fig. 3. The plan view and FIG. 5 are cross-sectional views showing an example of an ignition coil using the bobbin of the present invention. 10...Bobbin body, 11...Conductive foil, 12...Lead plate, 13...Claw (coupling means).

Claims (1)

[Scope of utility model registration request] In the ignition coil bobbin for winding the secondary winding of the ignition coil for an internal combustion engine ignition device, the above-mentioned
A conductive foil for soldering the beginning of the next winding is arranged, and a lead plate made of a conductive material is arranged at a position corresponding to the conductive foil on the inner peripheral surface of the bobbin body, and the lead plate and the conductive foil are arranged. A bobbin for an ignition coil, in which a foil and a foil are mutually connected by a connecting means that penetrates the bobbin body.