JP2003188034A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for internal combustion engine which has high reliability in contact by eliminating defects in contacting a terminal pin to a secondary terminal. <P>SOLUTION: In the ignition coil for internal combustion engine which stores an iron-core coil assembly body 12 magnetically connecting a primary coil 18 to a secondary coil 21 by an iron core 13 in an insulating case 22 and pressure-welds a secondary terminal pin 20B connected to the secondary coil 21 to a secondary terminal 26 by own elasticity, a mediation terminal 27 in a spring shape is arranged in the portion of the secondary terminal 26 pressure- welding the secondary terminal pin 20B and a V-shape bent portion 20v of which the one part enters the mediation terminal 27 is provided in the portion corresponding to the mediation terminal 27 of the secondary terminal pin 20B. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold type internal combustion engine ignition coil for supplying a high voltage for generating a spark discharge to an ignition plug of an automobile engine, for example.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing a schematic structure of a conventional ignition coil for an internal combustion engine.

In FIG. 3, the ignition coil 11 for an internal combustion engine is shown.
Is an iron core / coil assembly 12, an insulating case 22 made of synthetic resin for housing the iron core / coil assembly 12, and a plurality of unillustrated primary terminals (low voltage terminals) attached to the insulating case 22. (25), and one secondary terminal (high voltage terminal) 26, and a thermosetting resin 29 having an insulating property for fixing each component while insulating it in the insulating case 22.

The above-mentioned iron core / coil assembly 12 comprises a straight center iron core 14 and a side iron core 15 having the center iron core 14 disposed therein to divide the inside into two and form a closed magnetic path with the center iron core 14. Iron core 13 and center iron core 1
Primary coil bobbin 16 into which 4 is inserted, primary terminal pins 17A and 17B arranged on this primary coil bobbin 16 and connected to a primary terminal (25), and primary coil bobbin 1
It is wound around 6 and the beginning of winding is the primary terminal pin 17
It is connected to A and the winding end is the primary terminal pin 1
7B, a primary coil 18 arranged inside the side iron core 15, a secondary coil bobbin 19 concentrically formed with the primary coil bobbin 16 through which the primary coil 18 is inserted, and the secondary coil bobbin 19. The secondary terminal pins 20A and 20B thus arranged are wound around the secondary coil bobbin 19, and the winding start is connected to the secondary terminal pin 20A and the winding end is the secondary terminal pin 20B.
And a secondary coil 21 arranged inside the side iron core 15.

Each terminal pin 17A, 17B, 20
A and 20B are made of, for example, brass wires. The secondary terminal pin 20B connected to the winding end of the secondary coil 21 has a collar 19a of the secondary coil bobbin 19 at a portion of the secondary terminal 26 which is cut or pressed into a conical shape with aluminum or brass. The positioning slits 19a ₁ formed in the corresponding positions are positioned correspondingly, and are pressed against the secondary terminals 26 by their own elasticity.

Next, the insulating case 22 is provided with a connector portion (23) (not shown) in which a plurality of primary terminals (25) are attached to the side wall by insert molding, for example, and the secondary terminal 26 is press-fitted. A high-voltage tower section 24 is provided at the bottom. The primary coil 18, the secondary coil 21, the primary terminal (25) and the secondary terminal 26 are connected so as to form a circuit as will be described later in operation.

Next, the operation will be described. Primary coil 1 of ignition coil 11 for internal combustion engine configured as described above
8, the primary terminal (25) and both primary terminal pins 17A,
When a predetermined current is passed through 17B and then cut off,
The high-voltage current generated in the secondary coil 21 is supplied to the ignition plug from the secondary terminal 26 via the secondary terminal pin 20B via a high tension cord (not shown).

[0008]

A conventional ignition coil 11 for an internal combustion engine, as shown in FIG. 3, has a secondary terminal pin 20B.
Is in point contact with the secondary terminal 26 at a single point, the secondary terminal pin 20B may be inclined depending on the inclination angle of the secondary terminal pin 20B.
If B bends upward, there is a high possibility that the secondary terminal pin 20B will separate from the secondary terminal 26 and contact failure will occur, resulting in a lack of contact reliability.

The present invention has been made to solve the above-described inconvenience, and improves the contact failure of the terminal pin to the secondary terminal, thereby providing an ignition coil for an internal combustion engine with high reliability in contact. It is provided.

[0010]

According to the present invention, an iron core / coil assembly, in which a primary coil and a secondary coil are magnetically coupled by an iron core, is housed in an insulating case and disposed in this insulating case. In the secondary terminal, in the ignition coil for an internal combustion engine in which the terminal pin connected to the terminal of the secondary coil is pressed by its own elasticity, a spring-shaped intermediary terminal is arranged at the part of the secondary terminal where the terminal pin is in pressure contact, A V-shaped bent portion, a part of which is inserted into the intermediary terminal, is provided at the portion corresponding to the intermediary terminal of the terminal pin, or a tubular intermediary terminal is provided at the secondary terminal portion where the terminal pin is pressed. A V-shaped bent portion, a part of which is inserted into the intermediary terminal, is provided at a portion of the terminal pin corresponding to the intermediary terminal. When the tubular intermediary terminal is arranged on the secondary terminal, it is desirable to provide a positioning notch at a portion of the intermediary terminal corresponding to the terminal pin.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an internal combustion engine ignition coil according to a first embodiment of the present invention. The same or corresponding parts as those in FIG.

In FIG. 1, a spring-shaped intermediary terminal 27 is arranged in the conical portion of the secondary terminal 26 with which the secondary terminal pin 20B is in pressure contact, with the conical portion fitted. Then, a V-shaped bent portion 20v, which is partially inserted into the intermediary terminal 27, is provided at a portion of the secondary terminal pin 20B corresponding to the intermediary terminal 27.

As described above, when the V-shaped bent portion 20v is provided in the portion of the secondary terminal pin 20B corresponding to the intermediary terminal 27, the secondary terminal pin 20B becomes the secondary coil bobbin 19.
Since the positioning slit 19a ₁ formed in the collar 19a of the collar is positioned so as to correspond to the secondary terminal 26,
Even if the inclination angle of the secondary terminal pin 20B slightly changes, the spring-shaped intermediary terminal 27 follows, so that the secondary terminal pin 20B can be reliably pressed against the intermediary terminal 27.

Also, the intermediary terminal 27 of the secondary terminal pin 20B.
Since the V-shaped bent portion 20v is provided in the portion corresponding to, the bent terminal 20v enters the intermediary terminal 27, so that the secondary terminal pin 20B comes into point contact with the intermediary terminal 27 at two points. When the inclination angle of the secondary terminal pin 20B changes, in the worst case, the tip end side of the bent portion 20v separates from the intermediary terminal 27, but the rear end side presses against the intermediary terminal 27, so that contact failure does not occur.

2 (a) and 2 (b) are longitudinal sectional views showing a schematic structure of an ignition coil for an internal combustion engine according to a second embodiment of the present invention, and the cylindrical intermediary terminal shown in FIG. 2 (a). It is an enlarged perspective view, and the same code | symbol is attached | subjected to FIG. 1 and FIG. 3 or an equivalent part, and description is abbreviate | omitted.

In FIG. 2, a cylindrical intermediary terminal 28 is arranged in the conical portion of the secondary terminal 26 against which the secondary terminal pin 20B is pressed, with the conical portion fitted. Then, a V-shaped bent portion 20v, a part of which is inserted into the intermediary terminal 28, is provided at a portion of the secondary terminal pin 20B corresponding to the intermediary terminal 28. Further, a V-shaped positioning notch 28c for positioning the secondary terminal pin 20B is provided at a portion of the intermediary terminal 28 corresponding to the secondary terminal pin 20B at a position of approximately 180 degrees on the circumference, that is, a portion having a diameter. It is provided.

As described above, when the bent portion 20v is provided at the portion corresponding to the intermediary terminal 28 of the secondary terminal pin 20B,
The secondary terminal pin 20B is a collar 19 of the secondary coil bobbin 19.
The secondary slit 2 is formed by the positioning slit 19a ₁ formed in
Since the positioning is performed so as to correspond to No. 6, even if the inclination angle of the secondary terminal pin 20B slightly changes, the secondary terminal pin 20B can be reliably pressed against the intermediary terminal 28.

Since the intermediate terminal 28 is provided with the V-shaped positioning notch 28c, the positioning notch 28c
So that the secondary terminal pin 20B is pressed against the intermediary terminal 28,
Since the V-shaped positioning notch 28c is guided and positioned so as not to move to the bottom of the positioning notch 28c, the secondary terminal pin 20B can be reliably pressed against the intermediary terminal 28. Further, since the bent portion 20v is provided in the portion of the secondary terminal pin 20B corresponding to the intermediary terminal 28, the secondary terminal pin 20B has two points on the intermediary terminal 28 when the bent portion 20v enters the intermediary terminal 28. Make point contact with. The secondary terminal pin 20
If the tilt angle of B changes, in the worst case, the bent portion 2
Although the front end side of 0v is separated from the intermediary terminal 28, the rear end side is pressed into contact with the intermediary terminal 28, so that contact failure does not occur.

In the above-described embodiment, an example in which the center core 14 and the side core 15 constitute the core 13 has been described.
The iron core may be configured only by the center iron core.
Further, although the description and illustration of the connector portion (23) and the primary terminal (25) are omitted, the connector portion (23) and the primary terminal (25) are naturally provided in the same manner as in the conventional example.

[0020]

As described above, according to the present invention, the spring-shaped intermediary terminal is arranged at the portion of the secondary terminal with which the terminal pin is in pressure contact, and the intermediary terminal is provided at the portion corresponding to the intermediary terminal of the terminal pin. A V-shaped bent portion that partially enters the inside is provided, or a cylindrical intermediary terminal is provided at the part of the secondary terminal where the terminal pin is in pressure contact, and the intermediary part is provided at the part corresponding to the intermediary terminal of the terminal pin. Since the V-shaped bent portion, which is partially inserted into the terminal, is provided, the terminal pin can be reliably pressed against the intermediary terminal even if the inclination angle of the terminal pin changes slightly. Further, since the bent portion is provided at the portion corresponding to the intermediary terminal of the terminal pin, the terminal pin can be brought into point contact with the intermediary terminal at two points by inserting the bent portion into the intermediary terminal.

Therefore, the contact failure of the terminal pin with the secondary terminal is improved, and the ignition coil for an internal combustion engine having high contact reliability can be provided. Further, when the cylindrical intermediary terminal is arranged on the secondary terminal, the positioning notch is provided at the portion corresponding to the terminal pin of the intermediary terminal, so that the terminal pin is pressed into contact with the intermediary terminal at the positioning notch. Since the terminal pin is guided and positioned, the terminal pin can be reliably pressed against the intermediary terminal.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an internal combustion engine ignition coil according to a first embodiment of the present invention.

2A is a vertical cross-sectional view showing a schematic configuration of an internal combustion engine ignition coil according to a second embodiment of the present invention, and FIG. 2B is an enlargement of the cylindrical intermediary terminal shown in FIG. 2A. It is a perspective view.

FIG. 3 is a vertical sectional view showing a schematic configuration of a conventional ignition coil for an internal combustion engine.

[Explanation of symbols]

11 Ignition Coil for Internal Combustion Engine 12 Iron Core / Coil Assembly 13 Iron Core 14 Center Iron Core 15 Side Iron Core 16 Primary Coil Bobbins 17A, 17B Primary Terminal Pin 18 Primary Coil 19 Secondary Coil Bobbin 19a Collar 19a ₁ Positioning Slits 20A, 20B Secondary Terminal Pin 20v Bent portion 21 Secondary coil 22 Insulation case 24 High voltage tower portion 26 Secondary terminal (high voltage terminal) 27, 28 Intermediate terminal 28c Positioning notch 29 Thermosetting resin

Claims (3)

[Claims] 1. An iron core / coil assembly in which a primary coil and a secondary coil are magnetically coupled by an iron core is housed in an insulating case, and the secondary terminal is provided in a secondary terminal disposed in the insulating case. In an ignition coil for an internal combustion engine in which a terminal pin connected to a terminal of a coil is pressed by its own elasticity, a spring-shaped intermediary terminal is arranged at a portion of the secondary terminal where the terminal pin is pressed, and the terminal pin is An ignition coil for an internal combustion engine, comprising a V-shaped bent portion, a part of which is inserted into the intermediary terminal, at a portion corresponding to the intermediary terminal. 2. An iron core / coil assembly in which a primary coil and a secondary coil are magnetically coupled by an iron core is housed in an insulating case, and the secondary terminal is provided in a secondary terminal arranged in the insulating case. In an ignition coil for an internal combustion engine that presses a terminal pin connected to a terminal of a coil by its own elasticity, a tubular intermediary terminal is arranged at a portion of the secondary terminal where the terminal pin is pressed, and the terminal pin is An ignition coil for an internal combustion engine, comprising a V-shaped bent portion, a part of which is inserted into the intermediary terminal, at a portion corresponding to the intermediary terminal. 3. The ignition coil for an internal combustion engine according to claim 2, wherein a positioning notch is provided in a portion of the intermediary terminal corresponding to the terminal pin.