JP2006291888A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for an internal combustion engine with a rubber part easy to mold with a die whose life can be elongated. <P>SOLUTION: The ignition coil 1 for the internal combustion engine comprises the rubber part 32 formed of an elastic material for sealing a protector portion 3 to be insulated from high voltage supplied from an ignition coil body 2 and preventing the entry of liquid into a plug hole of an engine head, a boot part 34 mounted on an insulator portion of an ignition plug and formed of an elastic material for insulating and sealing it, and an insulating pipe part 33 connecting the rubber part 32 to the booth part 34 and having a conductor 31 for supplying high voltage from the ignition coil body 2 to the ignition plug mounted on the engine head. The rubber part 32 consists of a first member 321 having a small diameter portion and a ring second member 322 fitted to the small diameter portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ignition coil for an internal combustion engine that generates a high voltage in order to generate spark discharge, for example, in an ignition plug of an automobile engine, and in particular, an ignition coil body is installed in a plug hole of an engine, Is connected to an ignition coil for an internal combustion engine by a cylindrical protector part containing a conductor.

An outline of an ignition coil for an internal combustion engine is generally as shown in FIG. 4, for example.
That is, the ignition coil 1 includes an ignition coil main body 2 and a protector portion 3 that connects the ignition coil main body 2 and an engine-side ignition plug (not shown). The ignition coil body 2 includes at least a primary coil 21 and a secondary coil 22, an iron core 23 (a center iron core 23a and a side iron core 23b) that magnetically couples both the coils 21 and 22, and a case 24 that houses these. The case 24 is filled with resin 11 and is called a mold-type ignition coil.

  Then, the ignition coil body 2 is installed in the plug hole of the engine head, and the ignition coil body 2 and the ignition plug on the engine side are electrically connected. Depending on the shape of the plug hole on the engine side, etc., depending on the shape of the engine side plug hole, etc., since there is usually some distance and direct connection is not possible, it is equipped with a protector part 3 with a built-in conductor 31. Connected.

  This protector section 3 is usually composed of a rubber part 32 for housing the high-voltage terminal 25, a resin-made insulating pipe part 33 containing a conductor 31 such as a coil spring, and an upper part of the spark plug. And a rubber boot portion 34 for storing the material (for example, see Patent Document 1).

JP 2003-239838 A

  For example, as shown in FIG. 4, the conventional protector portion 3 in the ignition coil for an internal combustion engine has a rubber portion 32 attached to the upper end of the insulating pipe portion 33 and a boot portion 34 attached to the lower end of the insulating pipe portion 33. Is configured.

  The rubber portion 32 communicates with an insertion hole 323 for inserting the terminal portion 26 of the ignition coil main body 2 in which the high voltage terminal 25 is accommodated, and an insertion hole 324 for inserting the insulating pipe portion 33. Is formed. The shape of the rubber part 32 is determined by the internal shape of the fitting hole 323 and the fitting hole 324 and the external shape for fitting the rubber part 32 into the plug hole on the engine side and preventing moisture from entering. It is complicated.

  As described above, when the shape of the rubber portion 32 is complicated, the shape of the mold is also complicated, and therefore there is a relationship with the rubber material to be molded, and the molding may be difficult. In addition, the mold having a complicated shape has a short life. Furthermore, if the shape is complicated, the number of pieces per surface is reduced, resulting in high cost.

  The problem to be solved by the present invention is to provide an ignition coil that can easily mold a rubber part and extend the life of a mold.

The invention according to claim 1 includes at least an ignition coil main body that generates a high voltage including a primary coil, a secondary coil, and an iron core that magnetically couples both coils, and a case that houses them, and the ignition coil main body. An internal combustion engine ignition coil comprising: a protector for supplying a high voltage to the ignition plug; and the protector insulates and seals the high voltage supplied from the ignition coil main body. A rubber part made of an elastic body for preventing liquid from entering the plug hole of the engine head, a boot part made of an elastic body attached to the insulator part of the spark plug for insulation sealing, and the rubber part Is connected to the boot portion, and the high voltage supplied from the ignition coil body is supplied to an ignition plug attached to the engine head. An insulating pipe section comprising a conductor for feeding, in the configuration, the rubber portion, characterized by being divided into a plurality of members.
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the rubber portion is constituted by a first member having a small diameter portion and a ring-shaped second member fitted to the small diameter portion. It is.

  Since the rubber part is composed of a plurality of members, it becomes easy to mold individual members. Also, the mold can be simplified and the life of the mold can be extended. Further, by combining a plurality of members, it is possible to create a rubber portion having a desired shape, and it is possible to provide an ignition coil with high performance.

  An internal combustion engine in which a rubber part forming a protector part in an ignition coil for an internal combustion engine is divided into a plurality of members, so that molding is easy even with a complicated shape and the life of a mold can be extended. Ignition coil was realized.

  FIG. 1 is a cross-sectional view of an ignition coil 1 according to the present invention. That is, the ignition coil 1 includes an ignition coil main body 2 and a protector portion 3 that connects the ignition coil main body 2 and an engine-side ignition plug (not shown). The ignition coil body 2 includes a primary coil 21 and a secondary coil 22, an iron core 23 (a center iron core 23a and a side iron core 23b) that magnetically couples both the coils 21 and 22, and a case 24 that houses them. The case 24 is filled with the resin 11.

  On the other hand, the protector 3 includes an insulating pipe 33 having a conductor 31 for supplying a high voltage supplied from the ignition coil body 2 to an ignition plug attached to the engine head, and a rubber part 32 and a boot part to be described later. 34.

  That is, at the upper end of the insulating pipe part 33 constituting the protector part 3, the high voltage supplied from the ignition coil main body 2 is insulated and sealed, and a liquid such as water enters the plug hole of the engine head. In order to prevent this, for example, a rubber part 32 made of an elastic material such as rubber is joined.

  On the other hand, a boot portion 34 made of an elastic material such as rubber is attached to the lower end of the insulating pipe portion 33 and attached to an insulator portion (not shown) of the spark plug for insulation sealing.

  And in the ignition coil 1 for internal combustion engines which concerns on this invention, the rubber part 32 joined with the insulation pipe part 33 is comprised with several members, and it comprises with two members in the illustrated embodiment.

  That is, as shown in the schematic diagram of the ignition coil shown in FIGS. 2 and 3, the rubber portion 32 is joined to the insulating pipe portion 33 and the terminal portion 26 of the ignition coil body 2 housing the high-voltage terminal 25 is joined. The first member 321 and a ring-shaped second member 322 that is fitted to the outer peripheral portion of the first member 321 are configured.

  Specifically, the first member 321 is a two-stage columnar member having a small-diameter portion 321a on the upper side and a large-diameter portion 321b on the lower side as shown in FIG. A fitting hole 323 for fitting the terminal portion 26 of the ignition coil body 2 and a fitting hole 324 for fitting the insulating pipe portion 33 are hooked from the small diameter portion 321a to the large diameter portion 321b. It has a shape.

  In addition, a wall portion is erected around the fitting insertion hole 323, and this wall portion forms a small diameter portion 321 a of the first member 321, and the outer diameter of the wall portion forming the small diameter portion 321 a However, it has a smaller diameter than the outer diameter of the base part forming the large diameter part 321b.

  On the other hand, in the first member 321, a fitting hole 324 for fitting the upper end portion of the insulating pipe portion 33 is opened in the large diameter portion 321 b formed at the bottom of the small diameter portion 321 a, that is, the base portion. Reference numeral 324 communicates in the longitudinal direction with the insertion hole 323 into which the terminal portion 26 of the ignition coil body 2 is inserted.

  The second member 322 that constitutes the rubber portion 32 together with the first member 321 as described above is a ring-shaped member that includes a fitting hole 325 into which the wall portion that is the small diameter portion 321a of the first member 321 is fitted. . That is, a fitting hole 325 having an inner diameter that approximately matches the outer diameter of the wall portion is formed in the central portion of the second member 322 in the vertical direction. In addition, the outer diameter of the second member 322 is substantially the same as the outer diameter of the base, which is the large-diameter portion 321b of the first member 321, and the second member 322 is fitted to the small-diameter portion 321a of the first member 321. The second member 322 and the large-diameter portion 321b of the first member 321 are almost the same diameter and are integrated.

  Therefore, if the rubber part 32 is assembled by assembling the first member 321 and the second member 322 as described above, it can be handled in the same manner as a conventional integrated rubber part. Further, the second member 322 is positioned around the terminal portion 26 of the ignition coil body 2 in which the high-voltage terminal 25 is accommodated, and the small diameter portion of the first member 321 is interposed between the terminal portion 26 and the second member 322 in this state. The first member 321 and the second member 322 can be attached to the ignition coil body 2 by inserting the 321a.

  Further, the insulating pipe portion 33 may be attached to the first member 321 in advance, or the insulating pipe portion 33 may be attached to the rubber portion 32 after the rubber portion 32 is attached to the ignition coil body 2. Good. Alternatively, the rubber part 32 and the boot part 34 may be attached to the insulating pipe part 33 to form the protector part 3 and then joined to the terminal part 26 of the ignition coil body 2.

  According to the rubber part 32 as described above, even if the overall shape is complicated, the shape of each member becomes a simple shape, so that the shape of the mold is simplified. For this reason, it is easy to create a mold and the life of the mold is extended. Furthermore, the number of picks per side increases, and the cost can be reduced.

  Although the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments described above, and can be appropriately implemented as long as the configuration described in the claims is not changed. For example, in the illustrated embodiment, the rubber portion is divided into two members, but may be divided into three or more.

It is a longitudinal cross-sectional view which shows the ignition coil for internal combustion engines which concerns on this invention. 1 is an exploded schematic view showing an outline of an ignition coil for an internal combustion engine according to the present invention. It is sectional drawing which shows the rubber part of the ignition coil for internal combustion engines which concerns on this invention. It is a longitudinal cross-sectional view which shows the outline of the conventional ignition coil for internal combustion engines.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ignition coil 2 Ignition coil main body 3 Protector part 21 Primary coil 22 Secondary coil 23 Iron core 24 Case 25 High voltage terminal 31 Conductor 32 Rubber part 33 Insulation pipe part 34 Boot part 321 First member 322 Second member 323 Insertion hole 324 Fitting hole 325 Fitting hole

Claims (2)

At least an ignition coil main body that generates a high voltage including an iron core that magnetically couples both the primary coil and the secondary coil, and a case that houses these coils, and a high voltage that is attached to and supplied to the ignition coil main body In the ignition coil for an internal combustion engine configured with a protector section that supplies the spark plug to the spark plug,
The protector part is
A rubber portion made of an elastic material for insulatingly sealing a high voltage supplied from the ignition coil body and preventing liquid from entering the plug hole of the engine head;
A boot part attached to the insulator part of the spark plug and made of an elastic body for insulation sealing;
The rubber part and the boot part are connected, and an insulating pipe part having a conductor for supplying a high voltage supplied from the ignition coil body to an ignition plug attached to the engine head, and
An ignition coil for an internal combustion engine, wherein the rubber portion is divided into a plurality of members.   The ignition coil for an internal combustion engine according to claim 1, wherein the rubber portion is configured by a first member having a small diameter portion and a ring-shaped second member fitted to the small diameter portion.

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