JPH0128667Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an ignition coil for an internal combustion engine, particularly an ignition coil for an outboard motor.

Conventionally, the first ignition coil of this type was
The items shown in Figures and Figure 2 were found. In the figure,
1 is a laminated iron core, the surface 1a of which is exposed to the outside. 2 is the primary coil for low voltage, 3 is this 1
A high-voltage secondary coil is wound around the outer circumference of the secondary coil 2, 4 is a high-voltage pin to which the winding end of the secondary coil 3 is connected, and 5 is the primary coil 2, the secondary coil 3, and the high-voltage pin 4. 6 is a case for impregnating the thermosetting resin, 7 is a high voltage cord connected to the high voltage pin 4, and 8 is the end of the second turn of the primary coil. , a primary wire connected to the beginning of the third turn of the secondary coil, and 9 a thermoplastic resin for exterior use. Incidentally, this type of ignition coil electrically constitutes a transformer by the low-voltage primary coil 2, high-voltage secondary coil 3, and iron core 1.

Now, ignition coils for internal combustion engines are used in various engines, and the required specifications naturally vary depending on the application. For example, in a conventional example for an outboard motor, a case 6 impregnated with the thermosetting resin 5 is used as an iron core. 1
Insert the high voltage cord 7 and primary lead wire 8 into it.
Insert into thermoplastic mold with connected
The thermoplastic resin 9 is molded to cover the outer periphery of the iron core 1 or the case 6. However, in this conventional example, the surface 1a of the iron core 1 is exposed to the outside, and as time passes, water infiltrates from this part and damages the outer periphery of the secondary coil 3 or the end of the second turn of the primary coil. The drawback was that a leakage circuit was formed between the core 1 and the iron core 1, leading to spark failure. In addition, the iron core surface 1a is exposed to the outside, and red rust occurs, resulting in defects in appearance.

This idea was made in order to eliminate the above-mentioned drawbacks of the conventional product.It consists of a pair of mounting holes made of a resin material, a case and a mounting hole part made up of two parts, and a heat-hardened outer surface. The object of the present invention is to provide an ignition coil for an internal combustion engine that is impregnated and fixed with a synthetic resin, and can significantly improve rust prevention and waterproof properties.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

In the figure, 21 is an iron core, 22 is a case made of thermoplastic resin, and has a mounting hole 23 on one side. 24 is a primary coil for low voltage, 25 is a bobbin for the primary coil 24, and is integrally provided with an elongated mounting hole 26 on the other side forming a pair with the mounting hole 23. 27 is the high voltage secondary coil, 28 is the above 2
A bobbin for the secondary coil 27, 29 a high voltage pin, 30 a thermosetting resin, 31 a ground wire connected to the beginning of the 24th turn of the primary coil, 32 a primary wire, 33
is a high voltage cord. Further, the case 22 and the bobbin 25 have a fitting part 34, and positioning in the axial direction is achieved by the abutting part 35. Further, in order to prevent the bobbin 25 from separating from the case 22, a flange portion 25a is provided on the bobbin 25, and the tip 25b of the flange portion 25a is fitted into the recess 22a of the case 22, and there is a minute portion in the axial direction of the case recess 22a. A convex projection 22b is provided in a protruding manner, into which a flange portion 25a of the bobbin 25 is fitted.

According to one embodiment of this invention having the above configuration, unlike the conventional example, the iron core 21 is not exposed to the outside, and the mounting holes 23 and 2 are provided outside.
6 is made of thermoplastic resin and thermosetting resin for insulation and fixing, the problem of rust prevention is solved. Furthermore, regarding waterproofness, there is no path for water to enter the interior, thereby preventing the above-mentioned problems from occurring. In addition, the pair of mounting holes 23 and 26 are
However, the pitch is obtained by inserting the fitting part 34 on the outer periphery of the iron core 21, the abutting part 35, and the tip 25b of the bobbin flange part 25a into the recess 22a of the case 22. By making 26 of the two mounting holes 23 and 26 oblong, it is possible to compensate for pitch fluctuations.

As explained above, according to this invention, the mounting hole for the ignition coil is formed with a resin material, the case and the mounting hole are provided as a set of two parts, and the outer surface is impregnated and fixed with a thermosetting resin. This provides a great practical effect in that it is excellent in terms of waterproofing and rust prevention, and is particularly suitable for outboard motors.

[Brief explanation of the drawing]

1 and 2 are a front sectional view and a side view showing a conventional example, respectively, and FIGS. 3 and 4 are a front sectional view and a side view of an ignition coil for an internal combustion engine according to an embodiment of this invention. . 21... Iron core, 22... Case, 22b... Convex projection, 23, 26... Mounting hole, 24... Primary coil, 25... Primary coil bobbin, 25a...
...Bobbin flange part, 27...Secondary coil. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A case made of a thermoplastic resin material for resin impregnation in which one of a pair of mounting holes is formed, and a primary case made of a thermoplastic resin material in which the other mounting hole is formed. A bobbin, a primary coil is wound around the outer periphery of the primary bobbin, an iron core is inserted inside, a secondary coil is arranged around the outer periphery of the primary coil, and the tip of the primary bobbin is fitted into the case. An ignition coil for an internal combustion engine, characterized in that it is configured to be able to butt and position, and is further impregnated and fixed with a thermosetting resin. (2) The ignition coil for an internal combustion engine according to claim 1, wherein one side of the pair of mounting holes is an elongated hole. (3) The bobbin has a flange portion whose tip fits into the outer periphery of the case, and is provided with a minute convex projection forming a recess on the inner periphery of the case at the fitting portion, and the recess is provided with the An ignition coil for an internal combustion engine according to claim 1, wherein the ignition coil is positioned in the axial direction by inserting a flange portion.