JPH03242913A - Ignition coil for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent the bubbles of insulating resin from sticking to a connector and the insulating resin from scattering by covering the opening of a resin case, in which a coil is housed, with a plate and vacuum-pouring the insulating resin material through the section, not covered with the plate, of the opening. CONSTITUTION:The present invention includes a thermosetting insulating resin material 5, which are poured in a resin case 3 to insulate and fasten a coil 1, and a connector 4 electrically connected to the coil and fixed at the edge side of the opening 6 of the resin case. It has a plate 4a, having smaller projection area than the opening 6 of the resin case 3, to cover a part of the opening 6. A part of the opening 6 of the case is covered with the plate 4a and then the resin material 5 is poured through the section, not covered with the plate 4a, of the opening 6. Thereby the insulating resin is prevented from sticking to the connector 4 and scattering when poured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition coil for an internal combustion engine, and more particularly to the structure of a connector for an ignition coil.

[Conventional technology]

In conventional ignition systems for internal combustion engines, a primary coil and a secondary coil are fitted inside and outside and housed in a bottomed synthetic resin case, and thermosetting resin is poured into the case from the opening of the case. bury and fix both coils in the resin layer, and
Japanese Utility Model Application No. 62114428 discloses a closed magnetic path molded ignition coil in which a closed magnetic path is formed by an iron core that passes through the bobbin and has both ends exposed outside the case.

[Problem to be solved by the invention]

However, with the above-mentioned ignition coil, when injecting the insulating resin material through the opening of the case, bubbles may occur, and if the distance between the opening and the connector is small, the resin may adhere to the connector, or the insulating resin may adhere to the connector due to the force of injection. There is a problem with the material scattering.

An object of the present invention is to prevent resin adhesion to a connector and resin scattering that occurs when insulating resin is injected.

[Means to solve the problem]

As a means to solve the above problem, there is provided a coil part including a primary coil and a secondary coil wound around an iron core, a resin case housing this coil part, and a resin case injected into the resin case to insulate the coil part. a thermosetting insulating resin phase for fixing; a connector electrically connected to the primary coil and provided on the opening end side of the resin case;
An ignition coil for an internal combustion engine is proposed, comprising: a plate having a smaller projected area than the opening of the resin case and covering a part of the opening.

[Effect]

■ Cover part of the opening of the case with a plate that is smaller than the area of the opening of the resin case that houses the coil section consisting of the secondary coil and the secondary coil, and then insert the resin from the remaining opening that is not covered by the plate. inject.

〔Example〕 Embodiments of the present invention will be described based on the drawings.

FIG. 1 is a plan view of the ignition coil of the present invention, and FIG. 2 is a sectional front view of essential parts of the ignition coil of the present invention. 1 is a character-shaped iron core 2
2 is a coil part consisting of a primary coil wound through a bobbin and a secondary coil wound around a bobbin around the primary coil; 2 is a mouth formed integrally with the case 3 in the center of the resin case 3; A character-shaped closed magnetic path iron core portion, a character-shaped iron core 2a, is located at the center of the closed magnetic path iron core portion 2 and extends in the axial direction of the coil portion 1. Further, the resin case 3 has an opening 6 at the upper end, and the coil part 1 is housed inside. Reference numeral 4 denotes a resin connector integrally molded with a pair of conductive metal fittings 4c for connecting to the copper wires at both ends of the primary coil to conduct current from the outside. It is placed at the end. A plate 4a is integrally molded with the connector 4 and covers a part of the opening 6. 4b is a press-fitting part provided at the end of the connector 41 on the coil part 1 side, and this press-fitting part 4b is press-fitted into the hole 1a provided in the coil part 1 and fixed.

Further, the copper wires forming both ends of the primary coil of the coil portion l are respectively connected to a pair of conductive metal fittings 4c integrally molded within the connector. Further, one end of the copper wire forming the end of the secondary coil is connected to one end of the primary coil and the conductive metal fitting 4C via a diode 1b for preventing reverse current flow. A copper wire constituting the other end of the secondary coil is connected via a conductive metal fitting 7 to a high voltage terminal 8 to which a spark plug is connected. Reference numeral 5 denotes a thermosetting insulating resin material that is injected into the case 3 through the opening 6 and impregnated into the coil portion 1 .

In the above configuration, the coil part 1 consisting of the primary coil wound around the 0-shaped iron core 2a via a bobbin and the secondary coil wound around the bobbin around the primary coil is called the closed magnetic circuit iron core part 2. A connector 4 is assembled into a resin case 3 by combining the two iron cores in a Japanese character shape, and then stored. By press-fitting and fixing the press-fitting part 4b provided in the connector 4 into the hole 1a provided in the coil part l, the connector 4, which is integrally molded with a plate 4a that is smaller than the projected area of the connector 4 into the opening 6, forms a coil part. Fixed to 1. At this time, the projected area of the plate 4a integrally formed with the connector 4 onto the opening 6 is positioned so as to include the projected area 4S of the connector 4, as shown in FIG. Further, when the connector 4 is fitted and fixed in the coil part 1, the plate 4a is parallel to the axial direction of the coil part 1, and the height in the direction perpendicular to the coil axis is approximately the same as the opening 6. After press-fitting the press-fitting part 4'b provided in the connector 4 into the hole 1a provided in the coil part 1, the connector 4 is integrally molded, and a part of the conductive metal fittings 4c is exposed outside the connector 4. Copper wires forming both ends of the primary coil are connected to each other. Further, one end of the copper wire forming the end of the secondary coil is connected to the conductive metal fitting 4c via the diode 1b. The other end of the copper wire is connected to a conductive metal fitting 7 connected to a high voltage terminal 8, and the voltage generated in the secondary coil is outputted to the spark plug via the high voltage terminal 8.

After fitting the connector 4 into the resin case 3 as described above, a thermosetting liquid insulating resin material 5 is vacuum injected into the resin case 3 through the opening 6 not covered by the plate 1-4a, and then heated. The insulating resin material 5 is cured to insulate and fix the coil portion 1.

Further, the connector 4 only needs to be located near the opening 6 of the resin case 3, rather than above the opening 6. Further, the plate 4a is not integrally molded with the connector 4, but after storing the coil portion 1 in the resin case 3, the plate is inserted into the opening 6 of the resin case 3.
It is also possible to inject the insulating resin material after adhesively fixing the material.

This has the excellent effect of preventing the insulating resin foam from adhering to the connector and preventing the insulating resin from scattering.

[Brief explanation of drawings]

FIG. 1 is a plan view of the ignition coil of the present invention, and FIG. 2 is a sectional view of a main part of the ignition coil of the present invention. DESCRIPTION OF SYMBOLS 1... Coil part, 2a... Iron core, 3... Resin case 4... Connector, 4a... Plate 5... Insulating resin material. 6...Opening.

Claims (2)

[Claims] (1) A coil part including a primary coil and a secondary coil wound around an iron core, a resin case housing this coil part, and a resin injected into the resin case to insulate and fix the coil part. a thermosetting insulating resin material; a connector electrically connected to the primary coil and provided at the end of the opening of the resin case; and a connector of the opening having a smaller projected area than the opening of the resin case. An ignition coil for an internal combustion engine, comprising a plate that covers a portion of the coil. (2) The ignition coil for an internal combustion engine according to claim 1, wherein the plate is integrally molded with a case portion of the connector from resin.