JPH082990Y2 - Ignition coil for internal combustion engine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil for an internal combustion engine for producing spark discharge in an ignition plug of the internal combustion engine such as an automobile engine.

[0002]

2. Description of the Related Art One coil is used for each cylinder of an internal combustion engine, and a built-in switching module is used as a coil for a low-voltage distribution ignition system that supplies a high voltage directly to an ignition plug of each cylinder. Insulation resin is cast, and a cured insulation resin layer is used to fit a primary coil that fits outside the iron core into the above-mentioned insulating case, and a secondary coil that fits outside the primary coil.
The applicant has proposed in Japanese Utility Model Application No. 4-46338 what fixed the secondary coil and the switching module electrically connected to the primary coil.

[0003]

In the ignition coil of the above-mentioned prior proposal, a part of the insulating case is integrally provided with a primary coil and a part of a primary connector having a low voltage terminal electrically connected to the switching module. I am allowed. Therefore,
Before casting the insulating resin into the insulating case,
In addition, complicated wiring work is required to connect the switching module to the low-voltage terminal with a harness, which is troublesome and hinders productivity.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems by molding the primary connector separately from the insulating case. Insulating resin is cast in the insulating case. A primary coil fitted outside the iron core in the insulating case with a cured insulating resin layer, a secondary coil fitted outside the primary coil, and a switching module electrically connected to the primary coil In an ignition coil for an internal combustion engine in which and are fixed, a low voltage terminal electrically connected to the primary coil and the switching module is built in,
A primary connector having a housing for the switching module is provided separately from the insulating case, the housing holds the switching module, and the lead wire of the switching module and the low-voltage terminal are connected. The insulating resin layer fixes the primary connector and the switching module to the insulating case. In order to connect the bobbin of the primary coil and the primary connector in a predetermined assembled state, it is preferable to provide an uneven fitting portion that can be fitted to the bobbin of the primary coil and the primary connector.

[0005]

1 to 5 show an embodiment of the present invention, and FIGS. 6 to 10 show another embodiment of the present invention. In each embodiment, 1 is a primary coil, 2 is a secondary coil, 3 is a pair of C-shaped iron cores partially penetrating into the bobbin of the primary coil, 4 is a primary connector formed of resin, 5 Is also an insulating case, 6 is an insulating resin layer which is cast and cured in the insulating case, 7 is a switching module, 8 is a housing for the switching module integrally provided in the primary connector, and 9 and 10 are primary coils 1
To connect the primary connector 4 and the primary connector 4 so that they can be assembled individually.
The bobbin 11 of the secondary coil and the concave-convex fitting portion provided on the primary connector, 12 is a high-voltage terminal, and 13 is a primary terminal that is attached to the primary connector in a penetrating manner by insert molding when molding the primary connector. . The high-voltage terminal 12 is fixed by insert molding in a tubular portion that is integrally provided when the insulating case is molded.

The primary connector 4 has a tubular portion 4'for fitting a battery voltage supply, an ignition signal from the control unit, and a connection for grounding. When the plug is fitted in the tubular portion 4 '. The voltage and the ignition signal are supplied to the corresponding low-voltage terminals protruding from the bottom of the cylindrical portion, and the low-voltage terminals for grounding are connected to the external ground.

In the embodiment shown in FIGS. 1 to 5, the primary connector 4
The switching module accommodating portion 8 has a bottom, is formed in a hollow frame shape with one of its side surfaces opened, and is connected to the neck portion provided outside the bottom of the tubular portion 4 ′ by the front wall 8 a. Three low-voltage terminals 13b, 13c, 13d are embedded in the front-rear direction at the bottom of the housing portion 8 and project outward from the rear wall to facilitate connection with each lead wire of the switching module. . Of the three low-voltage terminals, 13b and 13c project from the bottom of the tubular portion 4'and connect to the plug as described above. The low voltage terminal 13d bends on the way to the tubular portion 4'and protrudes outward from one side of the neck portion. The other low-voltage terminal 13a protruding from the bottom of the tubular portion 4'bends on the way to the bottom of the accommodating portion 8 and projects outward from the other side of the neck.

To assemble the switching module 7 and the primary connector 4, the three holes at the bottom of the housing 8 are swung.
Fit the switching module into the housing portion 8 through the three leads down from the etching module from the addressed one, as shown in the wiring diagram of Figure 5, a second low-pressure receiving an ignition signal from an external control unit Terminal 13b
At the rear end of the switching module base lead wire 7a
Third low-voltage terminal 13 connected to the
Connect the emitter lead 7b of the switching module at the rear end of the c, connects the collector lead 7c of the switching module to the rear end of the fourth low pressure port 13d. Then, the concave-convex fitting portions 9 and 10 are fitted to each other, and one end 1a of the wire of the primary coil is connected to the first end before or after assembling the bottom of the accommodating portion 8 of the primary connector along the primary coil. Connected to the rear end of the low voltage terminal 13a, the other end 1 of the winding of the primary coil
b is connected to the front end of the fourth low-voltage terminal 13d, and the primary connector, the switching module, and the primary coil are integrated into one body (FIG. 2).

On the other hand, the secondary coil 2 is housed inside the insulating case 5, the high voltage terminal 12 and the secondary coil are connected, and the primary coil assembled integrally with the above-mentioned primary connector 4 is the secondary coil. Of the primary bobbin at the lower end of the primary bobbin to close the hole in the bottom of the insulating case, thus housing the primary connector and the primary coil in the insulating case, and vacuum-molding the insulating resin into the insulating case. Then, the hardened insulating resin layer 6 fixes the primary coil, the secondary coil, the primary connector, and the switching module. Then, one leg of the two C-shaped iron cores 3, 3 is inserted into the bobbin 11 of the primary coil from the bottom of the case 5 and from the top of the case, and the other leg of each iron core is on the side of the insulating case. Fix it along the outside and make it an ignition coil.

In the embodiment of FIGS. 6-10, the primary connector 4
The switching module housing portion 8 is formed as a gate frame provided outside the bottom of the tubular portion 4 ', and is connected to the tubular portion 4'by the intermediate wall 8b. Three low voltage terminals 13a, 13b and 13c are vertically penetrated and embedded in the bottom of the cylindrical portion 4 ', and the lower end portions of the respective terminals hang down from the lower surface of the bottom along the accommodating portion 8. . Of the three low-voltage terminals, 13a has a branch portion 13a 'that extends around the bottom of the tubular portion 4', and the end portion of this branch portion is located at a position apart from the lower end portion of the terminal 13a. Protruding downward from.

To assemble the switching module 7 and the primary connector 4, the switching module is fitted in the gate-shaped housing portion 8 and the switching module is sandwiched between the housing portions 8. The three lead wires protruding from the switching module are located inside the gate shape of the housing portion 8. And FIG.
As shown in the wiring diagram of No. 0, the switch is attached to the lower end of the second low voltage terminal 13b which receives the ignition signal from the control unit.
The base lead wire 7a of the teaching module is connected to the bottom end of the third low voltage terminal 13c which is connected to an external earth .
The first low-voltage terminal 1 to which the battery voltage is supplied from the outside by connecting the emitter lead wire 7b of the switching module.
Connect one end 1a of the winding of the primary coil 1 to 3a, and switch
The collector lead wire 7c of the ching module is connected to one end 1b of the winding of the primary coil. These wirings can be performed before or after the primary connector and the primary coil are assembled by the concave-convex fitting portions 9 and 10 or after the assembly. That is, since the accommodating portion 8 of the switching module is gate-shaped or U-shaped, the lead wires of the switching module and the ends of the windings of the low voltage terminal and the primary coil can be easily wired. Thus, the primary connector 4,
The switching module 7 and the primary coil are made into an integrated assembly (FIG. 7).

On the other hand, the secondary coil 2 is housed inside the insulating case 5 and one end of its winding is connected to the high voltage terminal 12,
The primary coil assembled integrally with the above-mentioned primary connector is passed through the inner circumference of the secondary coil, and the hole at the bottom of the insulating case is closed at the lower end of the primary bobbin, thus connecting the primary connector and the primary coil. Store in an insulating case. The end of the branch portion 13a 'of the first low voltage terminal 13a to which the battery voltage is supplied and the other end of the secondary coil are connected. Then, an insulating resin is vacuum-molded in the insulating case, and the cured primary insulating resin layer 6 fixes the primary coil, the secondary coil, the primary connector, and the switching module. And the two C-shaped iron cores 3,
One leg of No. 3 in the bobbin 11 of the primary coil
Insert from the bottom and above the case, and fix the other leg of each iron core along the outside of the side surface of the insulating case to form an ignition coil.

[0013]

As is apparent from the above, according to the present invention, the primary connector having the accommodating portion of the switching module is molded separately from the insulating case, and the switching module is accommodated in the accommodating portion to form the switching module. Each lead wire can be preliminarily connected to the low voltage terminal built in the primary connector. Therefore, vinegar in a small insulating case
The fine and complicated work of wiring each lead wire of the itching module to the low voltage terminal integrated with the insulating case is eliminated, and the productivity of the ignition coil is significantly improved. And
Since the primary connector molded separately from the insulating case is fixed together with the switching module by the insulating resin layer which is cast and hardened in the insulating case, there is no problem.
In addition, if the primary coil and the primary connector are disjointed, they may be lost during storage and one of them may be insufficient, and the primary coil may become the lower end of the bobbin when the ignition coil is assembled. The position of the primary connector is determined by closing the hole at the bottom of the insulating case with, but it is necessary to separately provide a device for positioning the primary connector in the insulating case. However, a bobbin of the primary coil and an uneven fitting portion that can be fitted to the primary connector are provided, and the uneven fitting portion is fitted to bring the bobbin of the primary coil and the primary connector into a predetermined assembled state. When coupled, one will not be lost during storage and the primary connector can be positioned with respect to the insulating case via the primary coil. Further, the primary coil and the primary connector can be integrally housed in an insulating case, which reduces the number of labors to be housed in half.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an ignition coil of the present invention.

2 is a perspective view of an assembled state of a primary coil, a primary connector, and a switching module of the ignition coil of FIG.

FIG. 3 is a perspective view of the disassembled state of FIG.

4 is a cross-sectional view of the ignition coil of FIG.

5 is a wiring diagram of the ignition coil of FIG.

FIG. 6 is a perspective view of another embodiment of the ignition coil of the present invention.

7 is a perspective view of an assembled state of a primary coil, a primary connector, and a switching module of the ignition coil of FIG.

8 is a perspective view of the disassembled state of FIG. 7. FIG.

9 is a cross-sectional view of the ignition coil of FIG.

10 is a wiring diagram of the ignition coil of FIG.

[Explanation of symbols]

1 Primary coil 2 Secondary coil 3 Iron core 4 Primary connector 5 Insulation case 6 Insulating resin layer 7 Switching module 8 Switching module housing 12 High voltage terminal 13 Primary terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location 9375-5E H01F 31/00 501 L

Claims (2)

[Scope of utility model registration request] 1. A primary coil in which an insulating resin is cast in an insulating case and a cured insulating resin layer is fitted into the insulating case outside the iron core, and a secondary coil which is fitted outside the primary coil. An ignition coil for an internal combustion engine, wherein a coil and a switching module electrically connected to the primary coil are fixed,
A primary connector having a built-in low voltage terminal electrically connected to the primary coil and the switching module and having a housing portion for the switching module is provided separately from the insulating case, and the switching module is housed in the housing portion. An ignition coil for an internal combustion engine, which is housed and connected to a lead wire of a switching module and a low voltage terminal, and wherein the insulating resin layer fixes the primary connector and the switching module to an insulating case. 2. The ignition coil for an internal combustion engine according to claim 1, wherein the bobbin of the primary coil and the primary connector are connected to each other in a predetermined assembled state.
An ignition coil for an internal combustion engine, comprising an uneven fitting portion that can be fitted to the next connector.