JPS5943710Y2 - Unit for internal combustion engine ignition system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a unit for an internal combustion engine ignition system in which an ignition coil and an ignition circuit for controlling the primary current of the ignition coil are molded with resin.

Generally, an ignition system for an internal combustion engine uses an ignition coil with a negative spark plug on the secondary side, and controls the primary current of the ignition coil so as to cause a small magnetic flux change in the ignition coil at the engine ignition timing. It consists of an ignition circuit.

In this type of ignition device, in order to provide weather resistance, the ignition coil and ignition circuit are molded together or individually in resin to form a unit.
When molding the ignition coil and ignition circuit together with resin, the conventional method was to form a groove in the collar of the ignition coil's bobbin, and then fit the end of the printed circuit board with the ignition circuit parts attached to this groove and adhere it. The method used was to fix the ignition coil with a resin and then mold the ignition coil and printed circuit board with resin.

However, this method of positioning and fixing the printed circuit board and ignition coil by adhesive is not only inefficient because it is not possible to perform molding work while the adhesive hardens, but also the adhesive work itself It was also complicated and difficult to work with.

Furthermore, when a printed circuit board is glued to an ignition coil, it is difficult to confirm whether the adhesive has hardened or not, so the molding process is performed with the adhesive uncured, and the pressure of the mold resin causes the printed circuit board to slide out of the groove. It may come off, the printed circuit board may move, and the insulation between the ignition coil and the ignition circuit may become defective.
In some cases, the edge of the printed circuit board was exposed on the outside of the mold part.

The purpose of this invention is to create a structure in which the flange of the ignition coil is held between the printed circuit board and some of the components of the ignition circuit, and to securely position and fix the position between the printed circuit board and the ignition circuit without using adhesive. An object of the present invention is to provide a unit for an internal combustion engine ignition device that can perform the following operations.

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

Figures 1 to 4 show casting in which the ignition coil and ignition circuit are inserted into the case and resin is injected into the case, thereby molding the ignition coil and ignition circuit with resin and integrating the ignition coil and ignition circuit with the case. This figure shows an embodiment in which the present invention is applied to a type of ignition device unit.
3 shows a right side view of FIG. 1, and FIG. 4 shows a sectional view of FIG. 3 along line IV--IV.

In these figures, 1 is a single-shaped iron core made by laminating a predetermined number of strip-shaped steel plates and caulked with rivets 101, and 2 is a body 201 through which core 1 is passed, and one end and the other end of the body 201, respectively. First and second collar portions 202 and 203 provided
A winding 3 consisting of a primary coil 301 and a secondary coil 301 is wound around a body 201 of the winding frame 2.

The primary coil 301 is directly wound around the body of the winding frame 2, and a separately wound secondary coil 302 is fitted around the outer periphery of this primary coil.

Therefore, the first flange 202 of the winding frame 2 is connected to the primary coil 301.
After the primary coil 301 is wound around the body of the winding frame 2, the first flange is A separately wound secondary coil 302 is inserted from the part 202 side.

The iron core 1, the winding frame 2, the primary coil 301, and the secondary coil 302 constitute an ignition coil, and the ignition coil is inserted into a resin case 5 with one end open, together with a printed circuit board and electronic components to be described later.

The case 5 has a core fitting hole 501 in the bottom wall thereof, and the end of the iron core 1 of the ignition coil on the first flange 202 side passes through the core fitting hole 501 and is exposed to the outside. ing.

The second flange 203 (/'i) of the winding frame 2 of the ignition coil is formed so that its outer end comes into contact with the inner surface of the case 5 for positioning with respect to the case. A plurality of notches 204 are provided for flowing the resin.

The second flange 203 also has a high-voltage wire support portion 2 that supports the high-voltage wire 6 connected to one end of the secondary coil of the ignition coil.
05 and a board support part 206 that supports a printed circuit board, and the high voltage wire 6 is fitted and held in a notch 207 provided in the high voltage wire support part 205.

A groove 208 is provided at a position near the end of the surface of the board support portion 206 on the winding 3 side, and an electronic component mounting recess 209 is provided on the surface opposite to the surface where the groove 208 is provided. There is.

7 is a printed circuit board on which the components of the ignition circuit are mounted, and this printed circuit board has a conductive layer 701 in a predetermined pattern on one side.
Terminals of electronic components such as resistors and capacitors arranged on the other surface of the substrate penetrate through the substrate and are soldered to predetermined portions of the conductive layer 701.

The printed circuit board 7 (/'i) The electronic component 8 is arranged to face the outer periphery of the winding 3, and one end thereof is fitted into the groove 208 of the board support part 206.

Some of the components constituting the ignition circuit are arranged in the electronic component mounting recess 209 of the board support portion 206, and in this embodiment, the transistor 9 is fitted into the recess 209.

The transistor 9 has a heat sink 901, and a projection 210 protruding from the bottom of the recess 209 is fitted into a hole provided in the heat sink 901.

The transistor 9 is fixed to the flange 203, with the head of the protrusion 210 protruding from the heat sink 901 being melted down by heating means such as a soldering iron.

A portion K adjacent to the recess 209 at the end of the substrate support portion 206
H) A groove 211 is formed for passing a conductor connecting the terminal of the transistor 9 to the printed circuit board, and in the illustrated example, three lead-shaped terminal conductors 90 led out from the transistor 9 are formed.
2 to 904 are soldered to the conductive layer 701 of the printed circuit board 7 through this groove 211.

As a result, the transistor 9 and the printed circuit board 7 are electrically and mechanically connected, and the collar portion 203 is sandwiched between the transistor 9 and the printed circuit board 7, and the printed circuit board is firmly fixed to the collar portion 203. be done.

The ignition coil is inserted into the case 5 after the printed circuit board 7 and the transistor 9 are attached. The dimensions of each part are set so that they abut.

After the printed circuit board and the ignition coil equipped with the transistor 9 are inserted into the case 5, a liquid thermosetting resin 10 such as epoxy is injected into the case 5, and this resin is heated and hardened to form the ignition device unit. Complete.

In the figure, reference numeral 11 denotes an external lead wire led out from the ignition circuit mounted on the printed circuit board 7.

The ignition device unit of the above embodiment is arranged on the stator side of a magnet generator attached to an engine, and the fifth
As shown in the figure, a magnetic pole member 13 facing the rotor magnetic pole of the magnet generator is fitted.

In this case, the protrusions 13a on the magnetic pole member 13 side fit into the grooves 102 provided at both ends of the iron core 1, and the removal of the magnetic pole member 13 is prevented.

In the above description, a cast-type unit was taken as an example, but the present invention can also be applied to injection molding without using a case.

In the above embodiment, the printed circuit board is supported by the flange on one side of the winding frame 2, but supporting parts for the printed circuit board may be provided at the flanges on both sides of the winding frame 2.

In this case, in order to enable the winding 3 to be fitted, one of the collars is configured to be removable and the button is pressed.

Although the specific configuration of the ignition circuit was not shown in the above embodiment, the configuration of the ignition circuit is arbitrary, and the present invention can be implemented regardless of the configuration of the ignition circuit.

In the above embodiment Ki, a groove 211 is provided at the end of the board support part 206 of the second collar part 203, and the connecting conductor 902 connects the transistor 9 and the printed circuit board through this groove 211.
Although the connection is made in steps 904 to 904, a hole may be provided at the end of the board support portion 206 and the connection conductor may be led out to the printed board side through this hole.

In the above embodiment, the flange 203 of the winding frame is sandwiched between the printed circuit board and the transistor 9, but the components placed on the opposite side of the printed circuit board are not limited to the transistor 9, and may include other components such as a thyristor. One or more parts may be arranged.

As described above, according to the present invention, the printed circuit board can be firmly positioned and fixed to the ignition coil by sandwiching the flange of the ignition coil winding frame between the printed circuit board and some parts. Therefore, it is possible to prevent the printed circuit board from moving during molding work.

Further, since there is no need for troublesome work such as checking whether the adhesive has hardened, work efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front vertical sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along line H-■ in Fig. 1, Fig. 3 is a right side view of Fig. 1, and Fig. 4 is a FIG. 5 is a cross-sectional view taken along the line IV-IV in the figure, and a front view of the main part showing a state in which the magnetic pole member is attached to the iron core. 1... Iron core, 2... Winding frame, 202.2
03...Brim part, 208...Groove, 3...
... Winding wire, 5 ... Case 7 ... Printed circuit board, 9 ... Transistor, 10 ...
···resin.

Claims (1)

[Scope of utility model registration request] A unit for an internal combustion engine ignition device is formed by molding an ignition coil and an ignition circuit for controlling the primary current of the ignition coil with resin, and a groove is provided on one surface of the flange of the ignition coil, and a groove is provided in the groove. An end portion of a printed circuit board on which components constituting the ignition circuit are mounted is fitted to the end portion of the printed circuit board, and some components of the ignition circuit are fixed to a surface of the collar portion opposite to the surface provided with the groove. The some of the components and the printed circuit board are electrically and mechanically connected by a connecting conductor, and the flange is held between one end of the printed circuit board and the some of the components. A unit for an internal combustion engine ignition device, wherein the ignition coil and the ignition circuit are molded with the resin.