JPH0627938Y2 - Ignition coil for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an ignition coil that constitutes an ignition device for an internal combustion engine.

[Conventional technology]

The ignition coil, which is one of the components of the ignition device for an internal combustion engine, has a coil bobbin wound with a primary winding and a secondary winding housed in a bobbin case, and the bobbin case housing the coil bobbin is resin-molded. Composed.

As described above, the ignition coil is manufactured by resin-molding a coil bobbin in which a winding is wound inside the bobbin case, so that the terminals of the winding, that is, the primary winding and the secondary winding of the ignition coil are placed outside the bobbin case. It is necessary to perform resin molding in the pulled-out state, and in particular, the high-voltage terminal connected to the spark plug can be directly connected to the connection wire of the spark plug by using a dedicated terminal tube.

That is, the high voltage terminal of the secondary winding is connected in advance to the terminal metal fitting of the terminal cylinder configured by assembling the screw-shaped terminal metal fitting to the lower end of the main body cylinder having the bottomed thin cylinder shape, and this coil bobbin and terminal The combination with the cylinder is incorporated into the bobbin case and resin-molded.

When assembling the combination of the coil bobbin and the terminal tube into the bobbin case, since the holding tube piece dedicated to the terminal tube assembling is integrally formed in the bobbin case, the coil bobbin has a passage for mounting the iron core. The terminal cylinder is externally assembled to the inner cylinder forming the hole, and the terminal cylinder is inserted and assembled into the holding cylinder piece.

In this way, the terminal cylinder is inserted and assembled into the holding cylinder piece integrally provided on the bobbin case body, but the holding cylinder piece integrally provided on the bobbin case body is the internal combustion engine to which the ignition device is assembled. In some cases, the type of engine or the manufacturer may differ in the location where it is integrally installed.
As disclosed in Japanese Patent No. 657, the coil bobbin and the terminal tube are connected to each other only by the secondary winding having high flexibility, and thus, the change of the integrally installed position of the holding tube piece with respect to the bobbin case body is dealt with. I am able to do so.

[Problems to be solved by the device]

However, since the secondary winding that connects the coil bobbin and the terminal tube is extremely thin and therefore easily breaks, when handling the combination of the coil bobbin and the terminal tube,
Also, during the work of assembling the combination of the coil bobbin and the terminal tube into the bobbin case, there often occurred an accident that the secondary winding connecting the coil bobbin and the terminal tube was broken.

Further, since the coil bobbin and the terminal tube are only connected by the extremely thin secondary winding, the coil bobbin can be handled with one hand and the other hand to handle the combination of the coil bobbin and the terminal tube. Since the terminal tube had to be picked up at the same time, its workability was extremely poor, resulting in poor work efficiency.

Therefore, the present invention has been devised to solve the above-mentioned problems in the prior art, and in a state capable of coping with the change in the shaping position of the holding cylinder piece integrally provided in the bobbin case body,
The technical issue is to assemble and fix the terminal tube to the coil bobbin, thereby preventing the occurrence of disconnection accident of the secondary winding connecting the coil bobbin and the terminal tube, and handling the combination of the coil bobbin and the terminal tube. The purpose is to make assembly work on the bobbin case safe and easy.

[Means for Solving the Problems]

Means of the present invention for achieving the above technical problem is to provide a bottom wall continuously between a lower end of an outer cylinder forming an outer wall and a lower end of an inner cylinder forming a through hole for inserting an iron core. A bobbin case in which a holding cylinder piece that is open in the upper and outer cylinders is bulged in a part of the upper end face flange piece, and at least one engaging portion is formed on the outer surface of the upper end face flange piece. It has a coil bobbin that is inserted into and assembled with the bottom of the main body cylinder with a bottomed thin cylinder shape, and a terminal metal fitting to which the high-voltage terminal of the winding wound on the coil bobbin is connected. From the surface, a terminal tube is provided that extends from a surface and has a connecting arm that engages with the engaging section and that has a locking section that serves as a center of rotational displacement in a posture parallel to the coil bobbin of the main body tube. , It is in.

When the coil bobbin has a substantially right-angled rectangular tube shape, the engaging portion formed on the upper end face flange piece of the coil bobbin is
It is preferable to provide it at each of the adjacent corners of the upper end face flange piece.

Further, in order to stabilize the assembling posture of the terminal tube connected to the coil bobbin by the connecting arm with respect to the coil bobbin by engaging the engaging portion and the locking portion, the outer surface portion of the end face flange near the engaging portion is engaged. It is preferable that a stopper that restricts the rotational displacement limit of the connecting arm that is connected to the portion by the locking portion is provided in a protruding manner.

Furthermore, in order to easily and stably achieve engagement of the engaging portion with the engaging portion, the engaging portion has a blind hole shape, and the engaging portion is provided with a split groove over the entire height range. The shape is effective.

[Action]

With the coil bobbin and the terminal tube, with the high voltage terminal of the secondary winding wound around the coil bobbin connected to the terminal metal fittings of the terminal tube, the locking part formed at the tip of the connecting arm of the terminal tube is engaged with the coil bobbin. By engaging the parts, the parts are fixedly assembled and fixed to each other.

At the time of assembling and fixing the terminal tube to the coil bobbin, the assembling posture of the terminal tube to the coil bobbin is determined corresponding to the shaping position of the holding tube piece with respect to the bobbin case body.

In this way, since the coil bobbin and the terminal tube are integrally assembled by the engagement of the engaging portion and the locking portion, the combination of the coil bobbin and the terminal tube is handled as an integral body,
It is built into the bobbin case as it is.

When the coil bobbin has a substantially right-angled rectangular tube shape, the bobbin case into which this coil bobbin is inserted and assembled also has a substantially right-angled rectangular tube shape. Almost without exception, the shape of the holding cylinder piece is the corner portion of the outer cylinder of the bobbin case.Therefore, the engaging portions formed on the coil bobbin are provided at the adjacent corner portions of the upper end face flange piece, respectively. As a result, no matter which corner of the outer cylinder of the bobbin case is shaped by the holding cylinder piece, the terminal cylinder can be assembled and fixed to the coil bobbin in correspondence with the holding cylinder piece shaping position.

Further, since the coil bobbin and the terminal tube are joined by simply engaging the engaging portion at the tip of the connecting arm with the engaging portion,
The connection attitude of the terminal tube with respect to the contact bobbin may be easily rotationally displaced about the engagement portion engaging with the engagement portion. Therefore, a stopper is provided in the vicinity of the engaging portion, and in a state where the connecting arm having the engaging portion engaged with the engaging portion abuts against this stopper, the assembling posture of the terminal tube with respect to the coil bobbin is properly adjusted. By setting, it is possible to easily assemble the terminal tube in the correct posture with respect to the coil bobbin, and, for example, when inserting and assembling the combination of the coil bobbin and the terminal tube into the bobbin case, assemble the terminal tube to the coil bobbin. Even if the mounting posture is erroneously rotationally displaced, the terminal cylinder can be easily and reliably corrected to the proper mounting posture with respect to the coil bobbin.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The bobbin case 1 is made of a synthetic resin that is an electric insulating material, and has a lower end of an outer cylinder 2 having a slightly rectangular and square shape,
A bottom wall is continuously provided between the lower end of the inner cylinder 3 having a rectangular tubular shape and
A holding cylinder piece 4 is formed at one corner of the outer cylinder 2 so as to be open above and inside the outer cylinder 2, and a part of the cylinder wall of the outer cylinder 2 is formed by curving and expanding into a cylindrical piece shape. Is configured.

The coil bobbin 5 is formed of a synthetic resin which is an electrically insulating material, and its main body has a slightly rectangular tube shape like the outer cylinder 2 of the bobbin case 1. It is a split winding type coil bobbin with an intermediate collar piece. Upper end face flange piece 6 of this coil bobbin 5
Blind hole-shaped engaging portions 7 are provided on the outer surface of the bobbin case 1. As shown in FIG. 2, the engaging portions 7 are provided at adjacent corners, respectively. It is selectively used according to the shaping position of the holding cylinder piece 4 formed on the outer cylinder 2.

A stopper 8 is provided so as to project at an appropriate height on the outer surface of the end face flange piece 6 near the engaging portion 7, and the stopper 8 is
Basically, a pair is provided on both sides of the engaging portion 7. In the case of the embodiment shown in FIG. 2, an engaging portion 7 is provided at one of the corners at the center of the corner and the end of the corner.

The terminal tube 10 is made of synthetic resin, which is an electrically insulating material, and has a slender bottomed cylindrical shape. The bottom wall is a screw-shaped terminal fitting.
A connecting arm 12 having a locking portion 13 at its tip is integrally extended from a substantially central portion of an outer peripheral surface of a main body cylinder 11 to which 15 is assembled. Locking part attached to the tip of the connecting arm 12
Reference numeral 13 is a short cylindrical piece, and as shown in FIG. 3, by providing a split groove 14 over the entire height range, it is elastically deformed so that fitting into the engaging portion 7 can be easily achieved.

The coil bobbin 5 and the terminal cylinder 10 are formed by soldering the high voltage terminal of the secondary winding in the winding 9 wound around the coil bobbin 5 to the end surface exposed below the terminal fitting 15 attached to the terminal cylinder 10. In a state of being connected by means such as the above, the engaging portion 13 is engaged with the engaging portion 7 and coupled, but at this time, it is located at a position that matches the shaping position of the holding cylinder piece 4 with respect to the outer cylinder 2. Select the engaging portion 7.

In this way, after engaging the locking portion 13 with the selected engaging portion 7, the terminal tube 10 is rotationally displaced around the locking portion 13 and is connected to the one stopper 8 that has been set. The arm 12 is brought into contact with the coil bobbin 5 to accurately position the terminal tube 10 on the coil bobbin 5.

That is, the installation positions of the engaging portion 7 and the stopper 8 formed on the coil bobbin 5 are set so as to correspond to the type of the bobbin case 1 due to the difference in the forming position of the holding cylinder piece 4 with respect to the outer cylinder 2. -ing

[Effect of device]

Since the present invention has the above-mentioned configuration, it has the following effects.

Since the terminal tube connected to the coil bobbin by the thin secondary winding is fixedly connected to the coil bobbin and the coil bobbin and the terminal tube can be handled as one combination, the coil bobbin and the terminal tube can be combined. It is possible to easily, safely and swiftly carry out the combination work and the assembly work to the bobbin case, which can dramatically improve the work efficiency of the manufacturing work of the ignition coil and significantly reduce the occurrence of defective products. Can be reduced to

The terminal tube is assembled by being held in a fixed posture with respect to the coil bobbin by the engagement of the engaging part with the engaging part. A means for keeping the attitude of the terminal tube in one piece constant is not required, and thus the ignition coil manufacturing work can be simplified.

By providing a plurality of engaging portions, even if the coil bobbin and the bobbin case have a right-angled rectangular tube shape, it is possible to cope with the change of the shaping portion of the holding tube piece without any inconvenience, and thus, the coil bobbin having the same structure. The range of application of the combination with the terminal tube can be greatly expanded.

By providing the stopper in the vicinity of the engaging portion, the rotational position of the terminal tube with respect to the coil bobbin can be easily and accurately achieved, and thus the assembly work of the terminal tube with respect to the coil bobbin can be accurately and smoothly achieved. You can

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an ignition coil according to the present invention. FIG. 2 is a plan view of the coil bobbin in the embodiment shown in FIG. FIG. 3 is an overall longitudinal sectional view of the terminal tube in the embodiment shown in FIG. Explanation of reference numerals 1; bobbin case, 2: outer cylinder, 3; inner cylinder, 4; holding cylinder piece, 5; coil bobbin, 6; end face flange piece, 7; engaging portion,
8; stopper, 9; winding, 10; terminal tube, 11; body tube, 1
2; connecting arm, 13; locking part, 14; split groove, 15; terminal fitting.

Claims (4)

[Scope of utility model registration request] 1. A bottom wall is connected between a lower end of an outer cylinder (2) forming an outer wall and a lower end of an inner cylinder (3) forming a through hole for inserting an iron core. A bobbin case (1) in which a holding cylinder piece (4) that is open in the upper and outer cylinders (2) is bulged in a part of (2), and at least one engaging member is provided on the outer surface of the upper end face flange piece (6). Joint part (7)
And a coil bobbin (5) that is inserted into and assembled in the bobbin case (1), and a coiled bobbin (5) is wound around the lower end of the main body cylinder (11) having a bottomed thin tube shape. Assemble the terminal metal fitting (15) to which the high voltage terminal of the winding (9) is connected, and engage the engaging portion (7) at the tip from the outer peripheral surface of the main body cylinder (11). The main body tube (11)
Ignition for an internal combustion engine, comprising: a terminal tube (10) extending from a connecting arm 12 provided with a locking portion (13) that serves as a center of rotational displacement in a posture parallel to the coil bobbin (5). coil. 2. A coil bobbin having a substantially right-angled rectangular tube shape.
The internal combustion engine according to claim 1, wherein an engaging portion (7) formed on the upper end surface flange piece (6) of (5) is provided at each of adjacent corners of the upper end surface flange piece (6). Ignition coil. 3. A connecting arm 1 which is connected to the engaging portion (7) by a locking portion (13) at the outer surface portion of the end face flange piece (6) near the engaging portion (7) side.
The ignition coil for an internal combustion engine according to claim 1 or 2, further comprising a stopper (8) projecting from the stopper (8) for restricting a rotational displacement limit of the valve. 4. The engagement portion (7) has a blind hole shape, and the locking portion (13) has a short cylindrical piece shape provided with a split groove (14) over the entire height range. An ignition coil for an internal combustion engine according to item 3.