JPH0128664Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition coil mainly used in small internal combustion engines.

As this type of ignition coil, a secondary coil and a primary coil are arranged inside and outside with a ferrite core at the center in an insulating coil case having an opening at one end. and 1
Next, a device has been developed in which the secondary terminal is integrally bonded to the coil case using a thermosetting synthetic resin that is cured within the coil case.

The present invention is to easily and accurately fix the primary terminal and secondary terminal to the coil case without interfering with each other before bonding with thermosetting synthetic resin in this type of ignition coil, and to fix the secondary terminal to the coil case without interference with each other. It is an object of the present invention to provide the above-mentioned ignition coil, which holds the primary and secondary coils at the same time as positioning the terminals, and further facilitates injection of thermosetting synthetic resin into the coil case.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes an insulating coil case made of synthetic resin and having an opening at one end. Both coils 2 and 3 are arranged so that the coils 3 are located concentrically. The inner end surface of the secondary coil 3 abuts against a plurality of protrusions 1a protruding from the bottom surface of the coil case 1, and the inner end surface of the primary coil 2 abuts against a stepped portion 4 formed on the inner peripheral surface of the coil case 1. is collided with. This causes the primary coil 2
is positioned so that it can be located in the middle of the secondary coil 3 in the generatrix direction. The secondary coil 3 is wound around a hollow bobbin 5 made of synthetic resin, and a ferrite core 7 as a core and a secondary terminal connection plate 8 that overlaps with the ferrite core 7 are fitted into the square center hole 6 of the secondary coil 3.
The end of the connecting plate 8 on the side of the coil case opening is bent toward the end surface of the ferrite core 7, and a secondary terminal 9 passing through it is connected to the bent part by soldering. The terminal 9 is attached to an insulating connection tube 10 for a high voltage cord made of synthetic resin by penetrating its bottom. Further, the end of the connection plate 8 on the bottom side of the coil case is bent in the same way, and the winding start terminal 3 of the secondary coil 3 is attached to the bent part.
a is connected by soldering.

A plurality of plate-like protrusions 16, in the illustrated example, a pair of plate-shaped protrusions 16 that protrude in opposite directions from each other are provided on the outer circumferential surface of the proximal end of the connecting tube 10. Each protrusion 16 has a positioning protrusion 17 at its tip and a plurality of pressing protrusions 21 on its inner surface.

A pair of notch-shaped positioning recesses 15 are formed on the inner peripheral surface of the opening of the coil case 1 with a phase difference of 180°, and a connecting tube 10 is formed in both positioning recesses 15.
Both positioning protrusions 17 are engaged with each other. As a result, the secondary terminal 9 is positioned at the opening of the coil case 1 via the connecting tube 10, and the ferrite core 7 is held and positioned by both bent portions of the connecting plate 8. Furthermore, each pressing projection 21 abuts against the outer end surface of the secondary coil 3, and the inner end surface of the coil 3 is pressed against the projection 1a on the bottom surface of the coil case 1, so that the secondary coil 3 is positioned and at the same time Both coils 2 and 3 are held between the protrusion 16 and the bottom surface of the coil case 1.

Both primary terminals 11 have the same shape, and each terminal 11
consists of a low-voltage cord connecting portion 11a and a hook-shaped attachment portion 11b bent at the base end thereof. An elastic pawl 12 is formed at the tip of the attachment portion 11b that is bent in the opposite direction to the connection portion 11a by cutting and bending the tip of the attachment portion 11b toward the connection portion 11a. A letter-shaped notch 13 is formed.

The winding start end 2a of the primary coil 2 is wound around the notch 13 of one of the primary terminals 11 and connected by soldering. Further, winding end terminals 2b and 3b of the primary coil 2 and the secondary coil 3 are wound around the notch 13 of the other primary terminal 11, and similarly connected by soldering.

A pair of terminal positioning holes 14 opening in the end face of the opening of the coil case 1 are formed with a phase difference of 180° so that each hole 14 can be positioned between both protrusions 16 of the connecting tube 10. The tips of the mounting portions 11b of the pair of primary terminals 11 are forcibly inserted into the terminal positioning holes 14 against the elastic force of the elastic claws 12, so that both the primary terminals 11 are inserted into the terminal positioning holes 14. It is positioned and fixed at the opening of the coil case 1 without interfering with the secondary terminal 9.

After each component is arranged in the coil case 1 as described above, a thermosetting synthetic resin, such as an epoxy resin R, is injected into the coil case 1 through between the plate-like protrusions 16 of the connecting tube 10, and then vacuum removed. It is hardened by foam treatment. As a result, the primary coil 2, the secondary coil 3, the ferrite core 7, the connecting tube 10, and both primary terminals 11 are bonded to the coil case 1.
When this epoxy resin R is injected and degassed, it overflows from the opening of the coil case 1, but the overflow is received by the receiver 18 on the outer periphery of the opening of the coil case 1 and does not flow out to the outside. . This receiver 18 is cut off after the epoxy resin R is cured.

Each primary terminal 11 has an end of a low voltage cord 19,
Further, the ends of high voltage cords 20 are inserted into connection tubes 10 and connected to the secondary terminals 9, respectively.

As described above, according to the present invention, in an insulating coil case having an opening at one end, a secondary coil and a primary coil are arranged in a dual manner inside and outside with the core at the center.
In an ignition coil in which the core, primary and secondary coils, and primary and secondary terminals are integrally bonded to the coil case using a thermosetting synthetic resin that is cured within the coil case, the opening of the coil case is , an insulating connecting tube for a high voltage cord having a secondary terminal is positioned and fitted through a plurality of plate-like protrusions protruding from the outer peripheral surface of its base end, and these plate-like protrusions connect the primary and secondary terminals. Since the coil is held and the primary terminal is fixed to the coil case opening between the plurality of plate-like protrusions, the primary and secondary terminals can be easily and accurately fixed to the coil case without interfering with each other. I can do it. In addition, since the primary and secondary coils can be held at the same time as the secondary terminal is fixed by the plurality of plate-like protrusions of the connection tube that holds the secondary terminal, there is no need to provide a special holding member, and the structure becomes easy. Further, the thermosetting synthetic resin can be easily injected into the coil case between the plurality of plate-like protrusions of the connecting tube.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal sectional front view, taken along the line shown in Fig. 2, Fig. 2 is a view taken in the direction of the arrows in Fig. 1, and Fig. 3 is a cross-sectional view taken along the FIG. 4 is an enlarged cross-sectional view of the part shown in the direction of arrows, and FIG. 4 is an exploded perspective view. R... Epoxy resin as thermosetting synthetic resin, 1... Coil case, 2... Primary coil, 3
... Secondary coil, 7 ... Ferrite core as core, 9 ... Secondary terminal, 10 ... Connection tube, 11 ...
...Primary terminal, 16...Protrusion.

Claims (1)

[Scope of utility model registration request] Inside an insulating coil case with an opening at one end, a secondary coil and a primary coil are arranged inside and outside with the core at the center, and these cores, primary coils, and primary and secondary terminals are arranged inside and outside. In the ignition coil, the ignition coil is integrally bonded to the coil case by a thermosetting synthetic resin cured within the coil case, and an insulating material for a high voltage cord having the secondary terminal in the opening of the coil case. The connecting tube is positioned and fitted through a plurality of plate-like protrusions provided on the outer circumferential surface of the proximal end thereof, and these plate-like protrusions allow the above-mentioned
An ignition coil that holds a primary and secondary coil, and that the primary terminal is fixed to the coil case opening between the plurality of plate-like protrusions.