JP2008095631A - Ignition coil device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil device for an internal combustion engine in which the directivity of an insulating pipe part is eliminated and working efficiency in assembling of a high-voltage relay joint is improved. <P>SOLUTION: In the ignition coil device 1 for an internal combustion engine, the high-voltage relay joint 20 connected to a high-voltage tower part 122 of an insulating case 12 for transmitting high voltage from a high-voltage terminal 14 of an ignition coil main body 10 to an ignition plug 30 is composed of a rubber part 21 connected to the high-voltage tower part 122, a boot part 22 for covering the ignition plug 30, the insulating pipe part 23 for connecting the boot part 22 to the rubber part 21, and a coil spring 24 stored in the insulating pipe part 23 for transmitting high voltage from the high-voltage terminal 14 to the ignition plug 30. A locking means (221 or 222) locked to the coil spring 24 for holding the coil spring 24 with the high-voltage terminal 14 is provided on the inner periphery of the boot part 22 positioned on the inside of the insulating pipe part 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ignition coil device for an internal combustion engine for supplying a high voltage to an ignition plug of an internal combustion engine such as an automobile to generate a spark discharge.

  In general, an ignition coil device for an internal combustion engine is mounted in an engine room of an automobile or the like, and the size limit required from other engine parts is severe, so that the size reduction is progressing. A conventional ignition coil device for an internal combustion engine has a configuration as shown in FIG. 4, for example.

  Here, the ignition coil device 1 for an internal combustion engine shown in FIG. 4 is connected to the ignition coil body 10 and the high-voltage tower portion 122 of the insulating case 12 constituting the ignition coil body 10. The high voltage relay joint 20 is configured to transmit a high voltage from the high voltage terminal (secondary terminal) 14 to the spark plug 30.

  The ignition coil body 10 includes a coil-iron core assembly 11, an insulating case 12 that accommodates the coil-iron core assembly 11, a plurality of primary terminals 13 provided in the socket portion 121 of the insulating case 12, and an insulating case. Insulating resin such as epoxy resin for fixing the high-voltage terminal 14 provided in the high-voltage tower 122 of 12 and the coil-core assembly 11 filled in the insulating case 12 and accommodated by curing. 15.

  The coil-iron core assembly 11 includes a primary coil bobbin 111, a primary coil 112 formed by winding a winding around the outer periphery of the primary coil bobbin 111, and both ends connected to the primary terminal 13, and the primary coil bobbin 111 and the primary coil bobbin 111. A secondary coil bobbin 113 positioned outside the coil 112, a secondary coil 114 formed by winding a winding around the outer periphery of the secondary coil bobbin 113, and having a low voltage side connected to the primary terminal 13, for example, An iron core 116 that magnetically couples the connection conductor 115, one end of which is connected to the high voltage side of the secondary coil 114 and the other end of which is connected to the high voltage terminal 14, and the primary coil 112 and the secondary coil 114 and forms a closed magnetic circuit. It consists of and. The iron core 116 includes a center iron core 116a that penetrates the primary coil 112 and the secondary coil 114, and a side iron core 116b that is disposed around the center iron core 116a, the primary coil 112, and the secondary coil 114. .

  The high-pressure relay joint 20 is connected to the high-pressure tower portion 122 of the insulating case 12 and has a rubber portion 21 made of an insulating elastic body, and a part of the spark plug 30, that is, a top portion, covers the insulating portion. A boot portion 22 composed of an elastic body, an insulating pipe portion 23 connecting the boot portion 22 and the rubber portion 21, and housed in the insulating pipe portion 23, from the high voltage terminal 14 of the ignition coil body 10. The coil spring 24 is a conductor that transmits a high voltage to the spark plug 30.

  The rubber part 21 is configured such that the first circumferential recess 21a provided on the inner periphery of the rubber part 21 is fitted to the circumferential convex part 122a provided on the outer periphery of the high-pressure tower part 122 of the insulating case 12, thereby 122 is connected. In addition, the rubber portion 21 is configured such that the second circumferential concave portion 21b provided on the inner circumference is fitted to one of the circumferential convex portions 23a provided on the outer circumferences of both end portions of the insulating pipe portion 23, whereby the insulating pipe portion 23 is provided. It is connected to the. Further, the boot portion 22 is connected to the insulating pipe portion 23 by fitting a circumferential concave portion 22 a provided on the inner circumference with the other circumferential convex portion 23 a of the insulating pipe portion 23.

  The coil spring 24 has one end (upper end) connected to the high voltage terminal 14. A step 243 as an engaging portion provided at the other end (lower end) of the coil spring 24 forms a boundary between the large diameter portion 241 and the small diameter portion 242, and the lower inner periphery of the insulating pipe portion 23. Is engaged with a locking portion 231 provided in the insulating pipe portion 23 and held in the insulating pipe portion 23. Thus, the coil spring 24 is structured not to be detached from the high-pressure relay joint 20.

JP 2003-239838 A

  In the internal combustion engine ignition coil device 1 configured as described above, in general, the coil spring 24 is not detached from the high-pressure relay joint 20, so that one end of the coil spring 24 is connected to the high-voltage terminal 14 and the other end. The portion is engaged with the locking portion 231 of the insulating pipe portion 23 which is one of the components of the high-pressure relay joint 20. Thus, if the latching | locking part 231 is provided in the insulation pipe part 23, the up-down directionality will be made in the insulation pipe part 23, for example. Then, when assembling the high-pressure relay joint 20 including the rubber part 21, the boot part 22, the insulating pipe part 23, and the coil spring 24, it is necessary to align the direction of the insulating pipe part 23, and assembling work efficiency Was bad.

  The present invention has been proposed in view of the above circumstances, and an object thereof is to provide an ignition coil device for an internal combustion engine in which the direction of an insulating pipe portion is eliminated and the working efficiency of assembling a high-pressure relay joint is improved.

  In order to achieve the above object, the present invention houses at least a primary coil, a secondary coil, and an iron core that magnetically couples the secondary coil and the primary coil in an insulating case, and An ignition coil main body for supplying high voltage generated in the coil to a high voltage terminal housed in the high voltage tower portion of the insulating case, and a high voltage relay connected to the high voltage tower portion and transmitting the high voltage from the high voltage terminal to the ignition plug A high pressure relay joint, a rubber portion connected to the high pressure tower portion, a boot portion covering the spark plug, an insulating pipe portion connecting the boot portion and the rubber portion, and the insulation In an ignition coil device for an internal combustion engine, which is housed in a pipe part and configured with a conductor that transmits a high voltage from the high-voltage terminal to the spark plug, the conductor engages with the conductor. Locking means for holding the conductor in said high voltage terminal, characterized in that provided on the inner periphery of said boot portion located inside the insulating pipe part.

  The locking means is preferably constituted by an annular protrusion or a protrusion arranged in an annular manner with an interval.

  In the present invention, by providing locking means for engaging the conductor and holding the conductor with the high-voltage terminal on the inner periphery of the boot portion located inside the insulating pipe portion, the insulating pipe portion, for example, The vertical directionality can be eliminated. Therefore, when assembling the high-pressure relay joint, it is not necessary to align the direction of the insulating pipe portion, and the assembly work efficiency can be improved.

  Further, if the locking means is constituted by an annular protrusion, the conductor can be locked with a simple structure, and if the locking means is constituted by a protrusion arranged annularly at an interval, the engagement of the annular protrusion is determined. Compared with the case of constituting the stopping means, the material constituting the boot portion can be saved.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment.
FIG. 1 is a longitudinal sectional view of an ignition coil device for an internal combustion engine according to the present invention, and FIG. 2 is an enlarged sectional view of a main part of the ignition coil device for an internal combustion engine according to the present invention. 3 (a) and 3 (b) are plan views of a boot portion that is a component of the ignition coil device for an internal combustion engine of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as the ignition coil apparatus for internal combustion engines shown as a prior art example in FIG. 4, and description is abbreviate | omitted.

  The ignition coil device 1 for an internal combustion engine according to the present invention shown in FIG. 1 is engaged with a step 243 of a coil spring 24 and has a locking means for holding the coil spring 24 with the high voltage terminal 14 of the ignition coil body 10. These are provided on the inner periphery of the boot portion 22 located inside the insulating pipe portion 23.

  As shown in FIG. 3 (a) or 3 (b), this locking means may be constituted by an annular projection 221 that circulates, or may be constituted by a projection 222 that is annularly arranged at an interval.

  As shown in the comparison between FIG. 1 and FIG. 4, the locking means provided on the inner periphery of the boot portion 22 is constituted by the annular protrusion 221 that circulates or the protrusion 222 that is annularly arranged at intervals. Even if the latching portion 231 that has conventionally existed in the insulating pipe portion 23 is eliminated, the vertical direction of the insulating pipe portion 23 can be eliminated without the coil spring 24 being detached from the high-pressure relay joint 20. When the vertical direction of the insulating pipe part 23 is lost, it is not necessary to align the direction of the insulating pipe part 23 when the high-pressure relay joint 20 is assembled, and the assembly work efficiency is improved.

  And if the latching means of the inner periphery of the boot part 22 is comprised by the cyclic | annular protrusion 221, the coil spring 24 can be latched with a simple structure. Further, when the locking means on the inner periphery of the boot portion 22 is configured by the protrusions 222 arranged in an annular shape with an interval, the material of the boot portion 22 is made as compared with the case where the locking means is configured by the annular protrusion 221. You can save.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment. The present invention can be modified in various ways without departing from the scope of the claims.

  For example, the conductor of the present invention may be a rod-shaped metal or the like as long as it is a conductive material in addition to the coil spring 24. However, when the conductor is the coil spring 24, the high voltage terminal 14 and the spark plug 30 can be reliably connected by the elasticity (stretchability) of the coil spring 24, so that a large allowable range of manufacturing dimensional error is taken. Can be manufactured easily.

  The shape of the locking means provided on the inner periphery of the boot portion 22 in the present invention is the annular protrusion 221 shown in FIG. 3A or FIG. However, in addition to these, the present invention can be modified to an extent that does not impair the object of the present invention.

  The engaging portion of the coil spring 24 held by the high voltage terminal 14 and the locking means provided on the inner periphery of the boot portion 22 has a stepped portion 243 at the intermediate portion of the coil spring 24 as shown in FIG. In addition, if the configuration is such that the coil spring 24 and the spark plug 30 are electrically connected, it can be set at the lower end.

1 is a longitudinal sectional view of an ignition coil device for an internal combustion engine according to the present invention. It is a principal part expanded sectional view of the ignition coil apparatus for internal combustion engines of this invention. (A) And (b) is a top view of the boot part which is one of the components of the ignition coil apparatus for internal combustion engines of this invention. It is a longitudinal cross-sectional view of the conventional ignition coil device for internal combustion engines.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ignition coil apparatus for internal combustion engines 10 Ignition coil main body 11 Coil-iron core assembly 111 Primary coil bobbin 112 Primary coil 113 Secondary coil bobbin 114 Secondary coil 115 Connection conductor 116 Iron core 116a Center iron core 116b Side iron core 12 Insulating case 121 Socket part 122 High voltage Tower part 122a Circumferential convex part 13 Primary terminal 14 High voltage terminal (secondary terminal)
DESCRIPTION OF SYMBOLS 15 Insulation resin 20 High voltage | pressure relay joint 21 Rubber part 21a 1st surrounding recessed part 21b 2nd surrounding recessed part 22 Boot part 221 Annular protrusion (locking means)
222 Protrusions (locking means) arranged annularly at intervals
22a Circumferential concave portion 23 Insulating pipe portion 231 Locking portion 23a Circumferential convex portion 24 Coil spring (conductor)
241 Large diameter portion 242 Small diameter portion 243 Step portion (engagement portion)
30 spark plug

Claims (2)

At least a primary coil, a secondary coil, and an iron core that magnetically couples the secondary coil and the primary coil are accommodated in an insulating case, and a high voltage generated in the secondary coil is stored in the high voltage of the insulating case. An ignition coil main body to be supplied to a high-voltage terminal housed in the tower,
It is connected to the high voltage tower part, and consists of a high voltage relay joint that transmits a high voltage from the high voltage terminal to a spark plug,
The high pressure relay joint is housed in the insulating pipe portion, a rubber portion connected to the high pressure tower portion, a boot portion covering the spark plug, an insulating pipe portion connecting the boot portion and the rubber portion, and In the ignition coil device for an internal combustion engine configured with a conductor that transmits a high voltage from the high-voltage terminal to the ignition plug,
An internal combustion engine characterized in that a locking means that engages with the conductor and holds the conductor with the high-voltage terminal is provided on the inner periphery of the boot portion located inside the insulating pipe portion. Ignition coil device. The ignition coil device for an internal combustion engine according to claim 1,
An ignition coil device for an internal combustion engine, characterized in that the locking means is constituted by an annular protrusion or a protrusion arranged annularly at an interval.

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