JPH0625941Y2 - Engine ignition coil - Google Patents

Description

TECHNICAL FIELD The present invention relates to an ignition coil of an engine.

2. Description of the Related Art Generally, one side of a C-shaped core is placed in a coil case, and a small piece of the I-shaped core is press-fitted into the open end of the C-shaped core outside the coil case to form a C-shaped core and an I-shaped core. In the ignition coil of the engine in which the magnetic closed circuit is formed by the above, it is necessary to provide a gap of about 1 mm between the C-shaped core and the I-shaped core which are integrally combined.

If the gap is not present, the hysteresis due to the C-type core and the I-type core that are integrally combined increases, the conversion efficiency of the coil decreases, and the ignition characteristic of the engine deteriorates.

However, in the past, when pressing the I-shaped core into the open end of the C-shaped core, cover the I-shaped core with a resin cap, and then press-fit the I-shaped core together with the cap into the open end of the C-shaped core. Thus, the cap ensures the gap between the I-type core and the C-type core.

However, if such a means is adopted, a cap is additionally required, the number of parts is increased, and the cap has to be covered with the I-shaped core before press-fitting, resulting in poor workability.

Purpose The present invention has been made in consideration of the above points, and by pressing the I-shaped core into the C-shaped core without any cap or the like, it is possible to insert the I-shaped core between the C-shaped core and the I-shaped core. An ignition coil for an engine, in which a predetermined gap is secured.

Configuration Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the ignition coil of the engine according to the present invention includes a coil bobbin 5 on which a secondary coil 4 is wound and a coil bobbin 12 on which a primary coil 11 is wound.
A coil unit including the cores 131 and 132 is incorporated in the coil case 1 having the open end 2, and the coil case 1 and the cores 131 and 132 are moded by the resin 23 so that the entire structure is integrally fixed. ing.

As the coil unit, the coil bobbin 12 on the primary side is coaxially inserted into the hollow shaft of the coil bobbin 5 on the secondary side, and one side of the C-shaped core 131 is inserted into the hollow shaft of the coil bobbin 12 on the primary side. It has become.

A hollow shaft (not shown) is integrally formed with the case at the center of the coil case 1, and the coil bobbin 12 on the primary side is fitted to the outside of the hollow shaft.
Further, one side of the core 131 can be inserted inside the hollow shaft.

The core of the ignition coil is composed of a combination of a C-shaped core 131 and a small I-shaped core 132. As shown in FIG. A magnetically closed circuit is formed by press-fitting into one end of the open end of 131.

In particular, in the present invention, as shown in FIGS. 2 and 3, a gap holding member made of a non-magnetic material is provided between the other end of the C-shaped core 131 and the I-shaped core 132. The plate 28 is integrally formed on the coil case 1 side so that the plate 28 is interposed. That plate 2
8 is formed to have a thickness of about 1 mm.

The plate 28 has a cover portion 29 for maintaining strength.
Is integrally formed with the coil case 1 so as to project therefrom. The other end of the C-shaped core 131 is put inside the cover part 29.

However, in such a configuration, one side of the C-shaped core 131 is inserted into the coil case 1, and then the I-shaped core 132 is press-fitted to one end of the C-shaped core 131 outside the coil case 1. Only by this, the plate 28 is interposed between the other end of the C-shaped core 131 and the I-shaped core 132, and a predetermined gap is secured.

As shown in FIGS. 2 and 3, the I-shaped core 13
A rib 25 for supporting the integrally combined C-shaped core 131 and I-shaped core 132 without rattling on the coil case 1 side is crushed on the coil case 1 side when the press-fitting of 2 is performed. It is provided.

Further, the primary side coil bobbin 12 is integrally formed with a low-voltage terminal coupler 14 so that the primary side coil bobbin 12 projects to the outside when the primary side coil bobbin 12 is incorporated into the secondary side coil bobbin 5.

As shown in FIG. 1, the low-voltage terminal coupler 14 has two holes 142 formed from the rear of the coupler case 141.
In addition, the terminal pins 15 having the stoppers 151 are inserted so that the rear ends of the coupler cases 141 are exposed behind the coupler cases 141.

Then, as shown in FIG. 2, the primary coil bobbin 12
, The rear end of each terminal pin 15 inserted into the coupler case 141 is formed on the flange portion of the secondary coil bobbin 5 so as to have a spring property. 24 by coupler case 14
It can be pressed to the 1 side.

The terminal pin 15 is not limited to the rod-shaped one, and may be a plate-shaped one.

In addition, in the configuration of FIG. 1, each terminal pin 15 mounted on the coupler case 141 and the coil wire 111 drawn from both ends of the primary coil 11 are connected to the connection terminal 1.
6 and 17 are electrically connected to each other.

The connection between each terminal pin 15 and the coil wire 111 by the connection terminals 16 and 17 is performed as follows.

First, as shown in FIG. 4 (a), the connection terminals 16 and 17 are caulked to one end of each terminal pin 15 (at this time, electrical conduction is established between the two), and each terminal pin 15 is connected to the coupler case. It is attached to 141.

Next, as shown in FIGS. 4B and 4C, the connection terminal 16 (17) is rotated to rotate the holder 1 on the coupler 14 side.
The coil wire 111 held in the groove of the eight portions is made to fit into the cut groove 19 provided on the side of the connection terminals 16 and 17 so as to establish electrical conduction.

The cut groove 19 has a groove width in the back which is slightly narrower than the diameter of the coil wire 111, and the coating of the coil wire 111 is peeled off by making the coil wire 111 bite into the thinned groove portion. Electrical continuity is established.

Further, a stopper 21 is provided on the coil bobbin 12 side, and the tip of the connection terminal 16 (17) in which the coil wire 111 is inserted into the cut groove 19 is locked to the stopper 21 to connect the connection terminal 16 (17). ) Is locked.

Further, a common connection terminal portion 20 for the primary coil 11 and the secondary coil 4 is integrally provided on one of the connection terminals 17, and as shown in FIG. 5, the coil bobbin 12 on the primary side is on the secondary side. When assembled in the coil bobbin 5, the common connection terminal 20 comes into contact with the coil terminal 22 attached to the coil bobbin 5 side. Then, the contact portion is soldered or electrically welded and connected.

Further, in the configuration of FIG. 1, the high voltage terminal pin 3 is so formed that the plug 31 portion projectingly formed at the rear end of the high voltage terminal pin 3 projects into the coil case 1. It is inserted in the part and fixedly attached.

The flange portion of the coil bobbin 5 around which the secondary coil 4 is wound so as to face the plug 31 of the high voltage terminal pin 3 is formed with a socket portion 91 having a spring property that cooperates with the plug 31 of the high voltage terminal pin 3. The secondary coil output terminal 9 is attached, and when the secondary coil bobbin 5 is inserted into the coil case 1 as shown in FIG. 2, the plug 31 of the high voltage terminal pin 3 becomes the secondary coil output terminal 9. The socket 91 is inserted into the socket 91 so that an electrical connection can be established between the two.

As shown in FIGS. 6A and 6B, the secondary coil output terminal 9 is inserted into a holder 10 provided on a flange portion at one end of the coil bobbin 5 and cut and raised on the terminal 9 side. The piece 92 is held in the holder 10 by being locked to the step portion on the holder 10 side.

The secondary coil output terminal 9 is integrally formed with a connecting portion 93 to which the coil wire 41 at the winding end of the secondary coil 4 wound around the coil bobbin 5 is drawn and connected from the coil bobbin 5.

The coil wire 41 is connected to the connecting portion 93 in the following manner.

First, as shown in FIG. 6 (b), the coil wire 4 drawn out from the cut groove 51 formed in the flange portion of the coil bobbin 5
1 is guided by the guide projection 52 and is passed through the central portion of the U-shaped groove formed in the connecting portion 93 of the secondary coil output terminal 9, and then it is entangled with the projection 53 provided on the coil bobbin 5 side and temporarily fixed. To do.

Next, as shown in FIG. 6 (c), the connection portion 93 of the secondary coil output terminal 9 is crushed to perform the fusing connection, and the unnecessary portion of the secondary coil wire 41 is cut to remove the coil bobbin. It is removed together with the protrusion 53 on the fifth side.

Effects As described above, in the engine ignition coil according to the present invention,
One side of the C-shaped core is put in the coil case, and the concave-convex fitting structure is formed on the outside of the coil case, which is formed relatively at each butting portion of one end of the C-shaped core and one end of the I-shaped core. , An I-shaped core is press-fitted into one end of the C-shaped core so that a magnetic closed circuit is formed by the C-shaped core and the I-shaped core. The plate is integrally molded on the coil case side so that a gap holding plate made of a non-magnetic material is interposed between the other end of the core and the core. The I-shaped core is a C-shaped core. Each core can be firmly assembled to the coil case side only by press-fitting to one end of the, and a predetermined gap can be easily and accurately secured between the C-type core and the I-type core, and ignition can be performed. Coil manufacturing automation And has an advantage that it becomes advantageous in Ruue.

[Brief description of drawings]

1 is an exploded perspective view showing an embodiment of an ignition coil of an engine according to the present invention, FIG. 2 is a front sectional view of an ignition coil in the same embodiment, FIG. 3 is a perspective view of a coil case and a core portion, 4 (a), (b) and (c) are perspective views of the primary coil bobbin portion showing the procedure for connecting the low voltage terminal pin and the primary coil terminal in the same embodiment, and FIG. 5 shows the primary coil bobbin in the same embodiment. FIG. 6A, FIG. 6A, FIG. 6B, and FIG. 6C are perspective views of the secondary coil bobbin portion showing the mounting procedure of the secondary coil output terminal in the same embodiment. is there. 1 ... Coil case, 3 ... High voltage terminal pin, 31 ... Plug, 4 ... Secondary coil, 5 ... Secondary coil bobbin high voltage tower, 9 ... Secondary coil output terminal, 12 ... Primary coil bobbin , 131: C-type core, 132: I-type core, 14: Low voltage terminal coupler, 28: Gap holding plate

Claims (1)

[Scope of utility model registration request] 1. A concavo-convex formed by inserting one side of a C-shaped core into a coil case and relatively forming one abutting portion of one end of the C-shaped core and one end of the I-shaped core outside the coil case. An ignition coil for an engine, in which an I-shaped core is press-fitted into one end of a C-shaped core to form a magnetic closed circuit by the C-shaped core and the I-shaped core. A plate for holding a gap made of a nonmagnetic material is integrally formed on the coil case side so that a plate made of a non-magnetic material is interposed between the abutting portion between the other end of the die core and the other end of the I-shaped core. The ignition coil of the engine characterized by the above.