JPH0536263Y2 - - Google Patents

Description

[Detailed explanation of the idea] Technical field The present invention relates to an ignition coil for an engine.

PRIOR ART In general, an ignition coil for an engine is provided with a coupler-type outlet, that is, a low-voltage terminal coupler, in which two low-voltage terminals each drawn out from both ends of the primary coil are provided as a pair.

Conventionally, in low-voltage terminal couplers for engine ignition coils, the terminal pins are insert-molded into the coupler case, or a lance is provided on the terminal pin to lock the terminal pin into the coupler case.

However, when insert molding is used, the process of attaching the terminal pins takes time, and when locking using lances is used, the structure becomes complicated, which is disadvantageous in terms of manufacturing.

Purpose This invention was made taking the above points into consideration.
To provide an ignition coil for an engine in which a terminal pin can be easily attached to a coupler case by a simple means.

Configuration An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the engine ignition coil according to the present invention includes a coil bobbin 5 around which a secondary coil 4 is wound, a coil bobbin 12 around which a primary coil 11 is wound, and cores 131, 132.
A coil unit consisting of a coil unit is assembled in a coil case 1 having an open end 2, and a portion of the coil case 1 is molded with resin 23 so that the entire structure is fixed as one piece.

As a coil unit, a primary coil bobbin 12 is coaxially inserted into the hollow shaft of the secondary coil bobbin 5, and one side of the core 131 is inserted into the hollow shaft of the primary coil bobbin 12. ing.

A hollow shaft (not shown) is integrally formed in the center of the coil case 1 to protrude from the case, and a coil bobbin 12 is fitted on the primary side outside the hollow shaft. One side of the core 131 can be inserted inside.

Further, as shown in FIG. 3, the primary coil bobbin 12 is provided with a low voltage terminal coupler 14 so as to protrude to the outside when the primary coil bobbin 12 is inserted into the secondary coil bobbin 5. It is being

In the ignition coil for such an engine, the present invention particularly uses the low voltage terminal coupler 14 as follows:
As shown in FIG. 1, terminal pins 15 each having a stopper 151 are inserted into two holes 142 drilled from behind the coupler case 141 so that their rear ends are exposed behind the coupler case 141. There is. Note that this terminal pin 15 is not limited to a rod shape, but may be a plate shape.

Further, in the present invention, as shown in FIG. 4, a pin presser 24 for pressing the rear end of each terminal pin 15 is provided on the collar of the secondary coil bobbin 5 facing each terminal pin 15 inserted into the coupler case 141. I am trying to set up each.

The pin presser 24 is integrally molded with the coil bobbin 5, and is formed into an L-shape so as to have spring properties.

However, with this configuration, the fifth
As shown in the figure, with the terminal pins 15 inserted into the coupler case 141, the primary coil bobbin 12 is inserted into the secondary coil bobbin 5 and locked in a predetermined position as described later. The rear end of the terminal pin 15 is pressed against the coupler case 141 by the pin presser 24.

At that time, each terminal pin 15 comes into contact with the floating tip of the pin holder 24, and the pin holder 24 has a spring property to push the terminal pin 15 into the coupler case 1.
41 side, each terminal pin 15 is pressed against the coupler case 141 without the tips of the terminal pins 15 retracting in the coupler case 141.
5. Positioning is performed.

In this way, according to the present invention, the coupler case 1
The terminal pin 15 can be fixed and attached to the coupler case 141 at a proper position by simply mounting the primary coil bobbin 12 provided with the coil bobbin 41 into the primary coil bobbin 5.

As a means for locking the secondary coil bobbin 5 of the primary coil bobbin 12, as shown in FIG. A protruding step 26 (see FIG. 1) formed around the flange of the primary coil bobbin 12 is fitted into the seat 25 and locked therein.

In addition, each terminal pin 15 attached to the coupler case 141 and the coil wire 111 drawn out from both ends of the primary coil 11 are connected to the connecting terminal 1.
6 and 17, respectively.

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

First, as shown in FIG. 6a, each terminal pin 15
Each terminal pin 15 is attached to the coupler case 141 by caulking the connecting terminals 16 and 17 to one end of the coupler (at this time, electrical continuity is established between the two).

Next, as shown in FIGS. 6b and 6c, the connecting terminals 16 and 17 are rotated to release the coil wire 1 held in the groove of the holder 18 on the coupler 14 side.
11 is inserted into a groove 19 provided on the side of the connecting terminals 16 and 17 to establish electrical continuity.

The kerf 19 has a groove width at the back of the coil wire 11.
By inserting the coil wire 111 into the narrow groove portion, the coating of the coil wire 111 is peeled off and electrical continuity is established.

Further, a stopper 21 is provided on the coil bobbin 12 side, and the ends of the connection terminals 16 and 17, in which the coil wire 111 is inserted into the cut groove 19, are stopped by the stopper 21, and the connection terminals 16 and 17 are stopped. I'm trying to keep it locked.

Furthermore, one connection terminal 17 has a primary coil 1
A common connection terminal section 20 between the coil bobbin 1 and the secondary coil 4 is integrally provided, and as shown in FIG. The connection terminal portion 20 is configured to come into contact with a coil terminal 22 attached to the coil bobbin 5 side. The contact parts are then soldered or electrically welded,
Electrical connection is ensured.

Further, in the engine ignition coil according to the present invention, as shown in FIG.
The high-voltage terminal pin 3 is press-fitted into the boss 8 portion on the coil case 1 side so that one portion protrudes into the coil case 1, thereby fixing it. Further, the secondary coil output terminal 9 has a socket portion 91 having spring properties that cooperates with the plug 31 of the high voltage terminal pin 3 formed on the collar portion of one end of the coil bobbin 5 on which the secondary coil 4 is wound.
I am trying to install it.

As shown in FIGS. 7a and 7b, the secondary coil output terminal 9 is inserted into a holder 10 provided at the collar of one end of the coil bobbin 5, and the cut-out piece 92 on the terminal 9 side is inserted into the holder. It is designed to be held within the holder 10 by being engaged with the stepped portion on the 10 side.

However, in such a case, coil case 1
When the secondary coil bobbin 5 is inserted inside, the plug 31 of the high voltage terminal pin 3 is inserted into the socket portion 91 of the secondary coil output terminal 9, and an electrical connection is established between the two.

Note that the secondary coil output terminal 9 has a connecting portion 93 of the secondary coil wire 41 wound around the coil bobbin 5.
are integrally formed.

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

First, as shown in FIG. 7b, when winding the coil, one end of the secondary coil wire 41 pulled out from the kerf 51 formed on the collar of the coil bobbin 5 is connected to the kerf 51 formed on the side of the coil bobbin 5. Guide protrusion 5
2 to pass between the connecting portions 93 of the secondary coil output terminal 9, and then hooked around the protrusion 53 formed on the coil bobbin 5 side and temporarily fixed.

Next, as shown in FIG. 7c, electric welding is performed while crushing the connecting portion 93 of the secondary coil output terminal 9 to connect the coil wire 41 to the connecting portion. The unnecessary portion is cut off and removed together with the protrusion 53 on the coil bobbin 5 side.

The core of the ignition coil is a combination of a C-shaped core 131 and an I-shaped core 132 made of small pieces.As shown in FIG.
A magnetic closed circuit is formed by fitting the wire into one end of the wire.

At that time, as shown in Figure 2, the coil case 1
The tip of the core 131 placed inside and the core 13
A case member of the coil case 1 made of a non-magnetic material is interposed between the coil case 2 and the coil case 1 with a thickness of about 1 mm, so that a gap is formed therebetween. Without this gap, the hysteresis caused by the cores 131 and 132 would increase, reducing the conversion efficiency of the coils and deteriorating the ignition characteristics of the engine.

Effects As described above, in the engine ignition coil according to the present invention, when the primary coil bobbin provided with the low-voltage terminal coupler is assembled into the secondary coil bobbin, the terminal pin inserted into the hole drilled in the coupler case. The terminal pin is pressed against the coupler case by a pin holder provided on the flange of the secondary coil bobbin, and the terminal pin can be easily attached to the coupler case by a simple method. It has excellent advantages.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of an engine ignition coil according to the present invention, Fig. 2 is a front sectional view of the engine ignition coil in the same embodiment, and Fig. 3 is a primary side coil bobbin in the same embodiment. A perspective view of the combined part with the secondary coil bobbin, FIG. 4 is a perspective view of the secondary coil bobbin in the same embodiment,
Figure 5 is a front cross-sectional view of the low voltage terminal coupler when the primary coil bobbin is assembled into the secondary coil bobbin, and Figures 6 a, b, and c are the connections between the low voltage terminal pin and the primary coil terminal using the connecting terminals in the same embodiment. FIGS. 7A, 7B, and 7C are perspective views of the secondary coil bobbin portion showing the procedure for attaching the secondary coil output terminal in the same embodiment. 1...Coil case, 3...High voltage terminal pin, 3
1... Plug, 4... Secondary coil, 5... Secondary coil bobbin, 9... Secondary coil output terminal, 91
...Socket part, 10...Holder, 12...Primary side coil bobbin, 131, 132...Core, 14
...Low voltage terminal coupler, 141...Coupler case, 24...Pin holder.

Claims (1)

[Scope of utility model registration request] A low voltage terminal coupler is provided on one collar of the primary coil bobbin around which the primary coil is wound, and when the primary coil bobbin is coaxially arranged within the secondary coil bobbin around which the secondary coil is wound. In an engine ignition coil in which a low-voltage terminal coupler protrudes to the outside, a terminal pin having a stopper in a hole drilled from behind the coupler case in the low-voltage terminal coupler so that its rear end is exposed behind the coupler case. An ignition coil for an engine, characterized in that a terminal pin is inserted into the ignition coil, and a pin holder is provided on a flange of a secondary coil bobbin facing the terminal pin.