JP2006310775A

JP2006310775A - Ignition coil device for internal combustion engine

Info

Publication number: JP2006310775A
Application number: JP2006037692A
Authority: JP
Inventors: Yu Yasuda; 祐安田; Masaaki Hori; 雅晶堀
Original assignee: Hanshin Electric Co Ltd
Current assignee: Hanshin Electric Co Ltd
Priority date: 2005-03-31
Filing date: 2006-02-15
Publication date: 2006-11-09

Abstract

PROBLEM TO BE SOLVED: To provide an ignition coil for internal combustion engine which can reduce the effect of radiated noises to peripheral equipment by suppressing the radiated noises. SOLUTION: The ignition coil 1 for internal combustion engine includes an ignition coil body 11, a protector 23 which is mounted on the ignition coil body 11 for feeding a high voltage supplied from the igniton coil body 11 to an ignition plug 51 mounted on an engine head 41 through coil springs 27, 28 and a resistor 29. An electromagnetic wave abosorber 31 covering between the resistor 29 and the ignition plug 51 is arranged in an insulation pipe 26 which constitutes the protector 23. COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、自動車のエンジンなどの内燃機関の点火プラグへ、火花放電を発生させるための高電圧を供給する内燃機関用点火コイルに関するものである。 The present invention relates to an ignition coil for an internal combustion engine that supplies a high voltage for generating spark discharge to an ignition plug of an internal combustion engine such as an automobile engine.

図５は従来の内燃機関用点火コイルをエンジンヘッドに取り付けた状態の要部の断面図である。 FIG. 5 is a cross-sectional view of a main part in a state where a conventional ignition coil for an internal combustion engine is attached to an engine head.

図５において、内燃機関用点火コイル１は、高電圧を発生させる点火コイル本体１１と、この点火コイル本体１１に取り付けられ、点火コイル本体１１から供給される高電圧を、エンジンヘッド４１に取り付けた点火プラグ５１へ供給するプロテクタ部２３とで構成されている。 In FIG. 5, the internal combustion engine ignition coil 1 is attached to the ignition coil body 11 for generating a high voltage and the ignition coil body 11, and the high voltage supplied from the ignition coil body 11 is attached to the engine head 41. The protector unit 23 supplies the spark plug 51.

上記した点火コイル本体１１は、絶縁ケース１２と、この絶縁ケース１２内に収容されたコイル鉄心組立体１４と、絶縁ケース１２のソケット部１３Ａに設けられた複数の低圧端子（一次端子）２０と、絶縁ケース１２の底に設けられた高圧タワー部１３Ｂの高圧端子挿入孔１３ｂ内に、例えば、圧入によって取り付けられ、コイル鉄心組立体１４の二次コイル１８の一端に接続された高圧端子（二次端子）２１と、絶縁ケース１２内に充填され、各部品の相互の高電圧絶縁を行う絶縁材としての熱硬化性樹脂２２とで構成されている。
なお、低圧端子２０は、絶縁ケース１２の成形時にインサートされる。 The ignition coil body 11 includes an insulating case 12, a coil core assembly 14 accommodated in the insulating case 12, and a plurality of low-voltage terminals (primary terminals) 20 provided in the socket portion 13A of the insulating case 12. In the high voltage terminal insertion hole 13b of the high voltage tower portion 13B provided at the bottom of the insulating case 12, for example, a high voltage terminal (two connected by one end of the secondary coil 18 of the coil core assembly 14 is attached by press fitting). (Next terminal) 21 and a thermosetting resin 22 as an insulating material that fills the insulating case 12 and performs high-voltage insulation between the components.
The low voltage terminal 20 is inserted when the insulating case 12 is molded.

そして、コイル鉄心組立体１４は、一次コイルボビン１５と、この一次コイルボビン１５に巻き付けられた一次コイル１６と、この一次コイル１６の外側に配置された二次コイル１８と、鉄心１９とで構成されている。
この鉄心１９は、一次コイル１６と二次コイル１８とを貫通するセンタ鉄心１９ａと、このセンタ鉄心１９ａが内側に配置され、センタ鉄心１９ａとともに閉磁路を形成するように二次コイル１８の外側に配置される環状のサイド鉄心１９ｂとで構成されている。
なお、二次コイル１８は、一次コイル１６の外側に配置される二次コイルボビンに巻き付けて形成してもよい。
そして、一次コイル１６、二次コイル１８、複数の低圧端子２０、高圧端子２１は、所定の回路を形成するように接続されている。 The coil core assembly 14 includes a primary coil bobbin 15, a primary coil 16 wound around the primary coil bobbin 15, a secondary coil 18 disposed outside the primary coil 16, and an iron core 19. Yes.
The iron core 19 has a center iron core 19a penetrating the primary coil 16 and the secondary coil 18, and the center iron core 19a is arranged on the inner side, and on the outer side of the secondary coil 18 so as to form a closed magnetic path together with the center iron core 19a. It is comprised by the cyclic | annular side iron core 19b arrange | positioned.
Note that the secondary coil 18 may be formed by being wound around a secondary coil bobbin disposed outside the primary coil 16.
And the primary coil 16, the secondary coil 18, the some low voltage terminal 20, and the high voltage terminal 21 are connected so that a predetermined circuit may be formed.

上記したプロテクタ部２３は、絶縁ケース１２の高圧タワー部１３Ｂに取り付けられ、二次コイル１８から供給される高電圧を絶縁し、かつ、エンジンヘッド４１のプラグホール４２への液体の浸入を防ぐ弾性体からなるラバー部２４と、点火プラグ５１の絶縁碍子５４部分に取り付けられ、高電圧を絶縁する弾性体からなるブーツ部２５と、このブーツ部２５とラバー部２４とを機械的に接続する絶縁パイプ部２６とで構成されている。
そして、絶縁パイプ部２６には、二次コイル１８から供給される高電圧を点火プラグ５１へ供給する導電体としてのコイルスプリング２７，２８と、このコイルスプリング２７，２８の間に位置し、伝導ノイズを低減させる、例えば、セラミック抵抗などの抵抗２９とが設けられている。 The above-described protector portion 23 is attached to the high-voltage tower portion 13B of the insulating case 12 and insulates the high voltage supplied from the secondary coil 18 and prevents elasticity from entering the plug hole 42 of the engine head 41. The rubber part 24 made of a body, the boot part 25 made of an elastic body that is attached to the insulator 54 portion of the spark plug 51 and insulates a high voltage, and the insulation that mechanically connects the boot part 25 and the rubber part 24 The pipe part 26 is comprised.
The insulating pipe portion 26 is located between the coil springs 27 and 28 as coil conductors 27 and 28 serving as conductors for supplying the high voltage supplied from the secondary coil 18 to the spark plug 51, and is For example, a resistor 29 such as a ceramic resistor is provided to reduce noise.

上記したエンジンヘッド４１には、点火プラグ５１を取り付けるためのプラグホール４２と、内燃機関用点火コイル１を取付ねじ６１で取り付けるため、プラグホール４２の周囲に位置する取付部４４とが設けられている。
そして、プラグホール４２の底には、点火プラグ５１の雄ねじ部５６を螺合させて点火プラグ５１を取り付けるための取付ねじ孔４３が設けられている。 The engine head 41 is provided with a plug hole 42 for attaching the ignition plug 51 and an attachment portion 44 positioned around the plug hole 42 for attaching the internal combustion engine ignition coil 1 with the attachment screw 61. Yes.
An attachment screw hole 43 for attaching the ignition plug 51 by screwing the male screw portion 56 of the ignition plug 51 is provided at the bottom of the plug hole 42.

上記した点火プラグ５１は、高電圧が供給される頂部端子５２と、この頂部端子５２から延びた中心電極５３と、この中心電極５３および頂部端子５２を絶縁する絶縁碍子５４と、この絶縁碍子５４の外側に設けられた金具５５とで構成されている。
そして、金具５５には、プラグホール４２の取付ねじ孔４３に螺合する雄ねじ部５６と、この雄ねじ部５６から延び、中心電極５３と火花間隙をおいて対向する電極５７とが設けられている。 The spark plug 51 includes a top terminal 52 to which a high voltage is supplied, a center electrode 53 extending from the top terminal 52, an insulator 54 that insulates the center electrode 53 and the top terminal 52, and the insulator 54 It is comprised with the metal fitting 55 provided in the outer side.
The metal fitting 55 is provided with a male screw portion 56 screwed into the mounting screw hole 43 of the plug hole 42 and an electrode 57 extending from the male screw portion 56 and facing the center electrode 53 with a spark gap. .

上記した取付ねじ６１は、内燃機関用点火コイル１をエンジンヘッド４１の取付部４４に、ラバー部２４がプラグホール４２を閉塞するように、絶縁ケース１２の被取付部１３Ｃに設けられた被取付孔１３ｃを利用して取り付けるものである。 The mounting screw 61 described above is mounted on the mounted portion 13C of the insulating case 12 such that the ignition coil 1 for the internal combustion engine is attached to the mounting portion 44 of the engine head 41 and the rubber portion 24 closes the plug hole 42. The holes 13c are used for attachment.

上述したように構成され、エンジンヘッド４１に取り付けられた内燃機関用点火コイル１に図示を省略したエンジンコントロールユニットから点火信号が供給されることにより、一次コイル１６に通電し、一次コイル１６の通電を遮断すると、鉄心１９に磁束が発生し、変化することによって二次コイル１８に発生した高電圧は、高圧端子２１、コイルスプリング２７、抵抗２９およびコイルスプリング２８を介して点火プラグ５１へ供給される。
そして、点火プラグ５１の放電によって発生する放電ノイズの内の伝導ノイズは、コイルスプリング２８、抵抗２９、コイルスプリング２７へと伝わり、抵抗２９によって低減させられる。 When the ignition signal is supplied from the engine control unit (not shown) to the internal combustion engine ignition coil 1 configured as described above and attached to the engine head 41, the primary coil 16 is energized, and the primary coil 16 is energized. Is interrupted, a magnetic flux is generated in the iron core 19, and the high voltage generated in the secondary coil 18 due to the change is supplied to the spark plug 51 via the high voltage terminal 21, the coil spring 27, the resistor 29 and the coil spring 28. The
The conduction noise among the discharge noise generated by the discharge of the spark plug 51 is transmitted to the coil spring 28, the resistor 29, and the coil spring 27, and is reduced by the resistor 29.

特開２００３−２４３２３４号公報JP 2003-243234 A

内燃機関用点火コイル１は、構成材料の多くが金属、樹脂であるので、点火プラグ５１の放電によって発生する放電ノイズの内の放射ノイズ（導体がアンテナとなって空気中を伝わるノイズで、一般的に電磁波ノイズと言われている。）の放出を抑制することができない。
そのため、内燃機関用点火コイル１からの放射ノイズの影響により、周辺機器が誤動作する恐れがあった。
なお、放射ノイズは、伝導ノイズが抵抗２９によって低減されるので、点火プラグ５１と抵抗２９との間で最も多く発生する。 Since the internal combustion engine ignition coil 1 is mostly made of metal or resin, it is a radiation noise among the discharge noises generated by the discharge of the spark plug 51 (the noise that is transmitted through the air using a conductor as an antenna. It is not possible to suppress the emission of electromagnetic noise).
Therefore, the peripheral device may malfunction due to the influence of radiation noise from the internal combustion engine ignition coil 1.
Note that radiation noise is most frequently generated between the spark plug 51 and the resistor 29 because conduction noise is reduced by the resistor 29.

この発明は、上記したような不都合を解消するためになされたもので、放射ノイズの放出を抑制することにより、周辺機器への放射ノイズの影響を低減させることのできる内燃機関用点火コイルを提供するものである。 The present invention has been made to solve the above-described inconvenience, and provides an ignition coil for an internal combustion engine that can reduce the influence of radiation noise on peripheral devices by suppressing the emission of radiation noise. To do.

この発明は、以下のような発明である。
（１）一次コイルと二次コイルとを鉄心が貫通したコイル鉄心組立体を絶縁ケース内に収容した点火コイル本体と、この点火コイル本体から供給される高電圧をエンジンヘッドに取り付けられた点火プラグへ供給するプロテクタ部とで構成され、このプロテクタ部が、前記絶縁ケースに取り付けられ、前記二次コイルから供給される高電圧を絶縁し、かつ、前記エンジンヘッドのプラグホールへの液体の浸入を防ぐラバー部と、前記点火プラグの絶縁碍子部分に取り付けられ、高電圧を絶縁するブーツ部と、このブーツ部と前記ラバー部とを機械的に接続し、前記二次コイルから供給される高電圧を前記エンジンヘッドに取り付けられた前記点火プラグへ供給する導電体および抵抗を備えた絶縁パイプ部とで構成された内燃機関用点火コイルにおいて、少なくとも前記抵抗と前記点火プラグとの間を覆う電磁波吸収部を、前記絶縁パイプ部に設けたことを特徴とする。
（２）一次コイルと二次コイルとを鉄心が貫通したコイル鉄心組立体を絶縁ケース内に収容した点火コイル本体と、この点火コイル本体から供給される高電圧をエンジンヘッドに取り付けられた点火プラグへ供給するプロテクタ部とで構成され、このプロテクタ部が、前記絶縁ケースに取り付けられ、前記二次コイルから供給される高電圧を絶縁し、かつ、前記エンジンヘッドのプラグホールへの液体の浸入を防ぐラバー部と、前記点火プラグの絶縁碍子部分に取り付けられ、高電圧を絶縁するブーツ部と、このブーツ部と前記ラバー部とを機械的に接続し、前記二次コイルから供給される高電圧を前記エンジンヘッドに取り付けられた前記点火プラグへ供給する導電体および抵抗を備えた絶縁パイプ部とで構成された内燃機関用点火コイルにおいて、少なくとも前記点火コイル本体と前記点火プラグとの間を覆う電磁波吸収部を、前記絶縁パイプ部に設けたことを特徴とする。
（３）一次コイルと二次コイルとを鉄心が貫通したコイル鉄心組立体を絶縁ケース内に収容した点火コイル本体と、この点火コイル本体から供給される高電圧をエンジンヘッドに取り付けられた点火プラグへ供給するプロテクタ部とで構成され、このプロテクタ部が、前記絶縁ケースに取り付けられ、前記二次コイルから供給される高電圧を絶縁し、かつ、前記エンジンヘッドのプラグホールへの液体の浸入を防ぐラバー部と、前記点火プラグの絶縁碍子部分に取り付けられ、高電圧を絶縁するブーツ部と、このブーツ部と前記ラバー部とを機械的に接続し、前記二次コイルから供給される高電圧を前記エンジンヘッドに取り付けられた前記点火プラグへ供給する導電体および抵抗を備えた絶縁パイプ部とで構成された内燃機関用点火コイルにおいて、前記絶縁パイプ部の内側と外側との一方に筒状の電磁波吸収部を設けたことを特徴とする。
（４）（３）に記載の内燃機関用点火コイルにおいて、前記プラグホール内へ挿入される少なくとも前記ラバー部の外側を覆うように電磁波吸収部を設けたことを特徴とする。
（５）（３）または（４）に記載の内燃機関用点火コイルにおいて、前記ブーツ部の外側を覆うように電磁波吸収部を設けたことを特徴とする。
（６）（１）から（５）のいずれか１つに記載の内燃機関用点火コイルにおいて、前記電磁波吸収部は異なる周波数特性の電磁波を吸収する複数の電磁波吸収部を積層して構成されていることを特徴とする。
（７）（１）から（５）のいずれか１つに記載の内燃機関用点火コイルにおいて、前記電磁波吸収部は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を混合して構成されていることを特徴とする。
（８）一次コイルと二次コイルとを鉄心が貫通したコイル鉄心組立体を絶縁ケース内に収容した点火コイル本体と、この点火コイル本体から供給される高電圧をエンジンヘッドに取り付けられた点火プラグへ供給するプロテクタ部とで構成され、このプロテクタ部が、前記絶縁ケースに取り付けられ、前記二次コイルから供給される高電圧を絶縁し、かつ、前記エンジンヘッドのプラグホールへの液体の浸入を防ぐラバー部と、前記点火プラグの絶縁碍子部分に取り付けられ、高電圧を絶縁するブーツ部と、このブーツ部と前記ラバー部とを機械的に接続し、前記二次コイルから供給される高電圧を前記エンジンヘッドに取り付けられた前記点火プラグへ供給する導電体および抵抗を備えた絶縁パイプ部とで構成された内燃機関用点火コイルにおいて、前記絶縁パイプ部を電磁波吸収体で構成したことを特徴とする。
（９）（８）に記載の内燃機関用点火コイルにおいて、前記電磁波吸収体は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を混合して構成されていることを特徴とする。
（１０）（８）または（９）に記載の内燃機関用点火コイルにおいて、前記ラバー部を、１０質量％〜５０質量％の電磁波吸収材を混入させた成形樹脂で成形したことを特徴とする。
（１１）（１０）に記載の内燃機関用点火コイルにおいて、前記ラバー部を成形する成形樹脂に混合されている電磁波吸収材は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を、それぞれ少なくとも１０質量％含有するとともに、その複数の電磁波吸収材の合計が５０質量％以下であることを特徴とする。
（１２）（８）から（１１）のいずれか１つに記載の内燃機関用点火コイルにおいて、前記ブーツ部を、１０質量％〜５０質量％の電磁波吸収材を混入させた成形樹脂で成形したことを特徴とする。
（１３）（１２）に記載の内燃機関用点火コイルにおいて、前記ブーツ部を成形する成形樹脂に混合されている電磁波吸収材は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を、それぞれ少なくとも１０質量％含有するとともに、その複数の電磁波吸収材の合計が５０質量％以下であることを特徴とする。 The present invention is as follows.
(1) An ignition coil body in which a coil core assembly in which an iron core penetrates a primary coil and a secondary coil is accommodated in an insulating case, and an ignition plug in which a high voltage supplied from the ignition coil body is attached to the engine head The protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head. A rubber part to be prevented, a boot part attached to an insulator part of the spark plug, which insulates a high voltage, mechanically connecting the boot part and the rubber part, and a high voltage supplied from the secondary coil An ignition coil for an internal combustion engine comprising an electric conductor for supplying a gas to a spark plug attached to the engine head and an insulating pipe portion having a resistance Oite, characterized in that the electromagnetic wave absorber that covers at least between the resistor and the spark plug, is provided in the insulating pipe part.
(2) An ignition coil body in which a coil core assembly in which an iron core passes through a primary coil and a secondary coil is housed in an insulating case, and an ignition plug in which a high voltage supplied from the ignition coil body is attached to the engine head The protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head. A rubber part to be prevented, a boot part attached to an insulator part of the spark plug, which insulates a high voltage, mechanically connecting the boot part and the rubber part, and a high voltage supplied from the secondary coil An ignition coil for an internal combustion engine comprising an electric conductor for supplying a gas to a spark plug attached to the engine head and an insulating pipe portion having a resistance Oite, characterized in that the electromagnetic wave absorber that covers between the spark plug and at least the ignition coil body, provided in the insulating pipe part.
(3) An ignition coil body in which a coil core assembly in which an iron core passes through a primary coil and a secondary coil is accommodated in an insulating case, and an ignition plug in which a high voltage supplied from the ignition coil body is attached to the engine head The protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head. A rubber part to be prevented, a boot part attached to an insulator part of the spark plug, which insulates a high voltage, mechanically connecting the boot part and the rubber part, and a high voltage supplied from the secondary coil An ignition coil for an internal combustion engine comprising an electric conductor for supplying a gas to a spark plug attached to the engine head and an insulating pipe portion having a resistance Oite, wherein the providing the one in the cylindrical electromagnetic wave absorption portion of the inside and outside of the insulating pipe part.
(4) The ignition coil for an internal combustion engine according to (3), wherein an electromagnetic wave absorbing portion is provided so as to cover at least the outer side of the rubber portion inserted into the plug hole.
(5) The ignition coil for an internal combustion engine according to (3) or (4), wherein an electromagnetic wave absorbing portion is provided so as to cover an outside of the boot portion.
(6) In the internal combustion engine ignition coil according to any one of (1) to (5), the electromagnetic wave absorber is configured by laminating a plurality of electromagnetic wave absorbers that absorb electromagnetic waves having different frequency characteristics. It is characterized by being.
(7) In the ignition coil for an internal combustion engine according to any one of (1) to (5), the electromagnetic wave absorber is configured by mixing a plurality of electromagnetic wave absorbers that absorb electromagnetic waves having different frequency characteristics. It is characterized by being.
(8) An ignition coil body in which a coil core assembly in which an iron core passes through a primary coil and a secondary coil is accommodated in an insulating case, and an ignition plug in which a high voltage supplied from the ignition coil body is attached to the engine head The protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head. A rubber part to be prevented, a boot part attached to an insulator part of the spark plug, which insulates a high voltage, mechanically connecting the boot part and the rubber part, and a high voltage supplied from the secondary coil An ignition coil for an internal combustion engine comprising an electric conductor for supplying a gas to a spark plug attached to the engine head and an insulating pipe portion having a resistance Oite, wherein the insulating pipe portion constituted by the electromagnetic wave absorber.
(9) The ignition coil for an internal combustion engine according to (8), wherein the electromagnetic wave absorber is configured by mixing a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics.
(10) The ignition coil for an internal combustion engine according to (8) or (9), wherein the rubber part is formed of a molding resin mixed with 10% by mass to 50% by mass of an electromagnetic wave absorbing material. .
(11) In the ignition coil for an internal combustion engine according to (10), the electromagnetic wave absorbing material mixed in the molding resin for molding the rubber portion includes at least a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics. The content is 10% by mass, and the total of the plurality of electromagnetic wave absorbing materials is 50% by mass or less.
(12) In the internal combustion engine ignition coil according to any one of (8) to (11), the boot portion is formed of a molding resin mixed with 10% by mass to 50% by mass of an electromagnetic wave absorbing material. It is characterized by that.
(13) In the internal combustion engine ignition coil according to (12), the electromagnetic wave absorbing material mixed in the molding resin for molding the boot portion includes at least a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics. The content is 10% by mass, and the total of the plurality of electromagnetic wave absorbing materials is 50% by mass or less.

この発明によれば、少なくとも抵抗と点火プラグとの間を覆う電磁波吸収部を、絶縁パイプ部に設けたので、放射ノイズを効率よく電磁波吸収部に吸収させて放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響を低減させることができる。
また、電磁波吸収部が覆う範囲を、少なくとも点火コイル本体と点火プラグとの間にしたので、より広い領域の放射ノイズを電磁波吸収部に吸収させて放射ノイズの放出をさらに抑制できることにより、周辺機器への放射ノイズの影響をさらに低減させることができる。
また、絶縁パイプ部の内側と外側との一方に筒状の電磁波吸収部を設けたので、さらに広い領域の放射ノイズを電磁波吸収部に吸収させて放射ノイズの放出をより一層抑制できることにより、周辺機器への放射ノイズの影響をより一層低減させることができる。
そして、プラグホール内へ挿入される少なくともラバー部の外側を覆うように電磁波吸収部を設けたので、プラグホールの内周面で反射し、プラグホールから出ようとする放射ノイズを、プラグホールを閉塞する電磁波吸収部が吸収して放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響をさらに低減させることができる。
さらに、ブーツ部の外側を覆うように電磁波吸収部を設けたので、プラグホールの内周面で反射する放射ノイズをより広い領域の電磁波吸収部で効率よく吸収できることにより、周辺機器への放射ノイズの影響を一層低減させることができる。
さらに、電磁波吸収部は異なる周波数特性の電磁波を吸収する複数の電磁波吸収部を積層して構成されているので、または、電磁波吸収部は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を混合して構成されているので、広範囲な周波数帯域の放射ノイズの影響を低減させることができ、信頼性を向上させることができる。
また、絶縁パイプ部を電磁波吸収体で構成したので、放射ノイズを効率よく電磁波吸収体に吸収させて放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響を低減させることができる。
そして、電磁波吸収体は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を混合して構成されているので、広範囲な周波数帯域の放射ノイズの影響を低減させることができ、信頼性を向上させることができる。
さらに、ラバー部を、１０質量％〜５０質量％の電磁波吸収材を混入させた成形樹脂で成形したので、ラバー部の弾性性、収縮性を確保しつつ、プラグホールの内周面で反射し、プラグホールから出ようとする放射ノイズを、プラグホールを閉塞するラバー部の電磁波吸収材が吸収して放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響をさらに低減させることができる。
そして、ラバー部を成形する成形樹脂に混合されている電磁波吸収材は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を、それぞれ少なくとも１０質量％含有するとともに、その複数の電磁波吸収材の合計が５０質量％以下であるので、広範囲な周波数帯域の放射ノイズの影響を低減させることができ、信頼性を向上させることができるとともに、ラバー部の弾性性、収縮性を確保することができる。
さらに、ブーツ部を、１０質量％〜５０質量％の電磁波吸収材を混入させた成形樹脂で成形したので、ブーツ部の弾性性、収縮性を確保しつつ、プラグホールの内周面で反射する放射ノイズをより広い領域の、ブーツ部の電磁波吸収材で効率よく吸収できることにより、周辺機器への放射ノイズの影響を一層低減させることができる。
そして、ブーツ部を成形する成形樹脂に混合されている電磁波吸収材は異なる周波数特性の電磁波を吸収する複数の電磁波吸収材を、それぞれ少なくとも１０質量％含有するとともに、その複数の電磁波吸収材の合計が５０質量％以下であるので、広範囲な周波数帯域の放射ノイズの影響を低減させることができ、信頼性を向上させることができるとともに、ブーツ部の弾性性、収縮性を確保することができる。 According to this invention, since the electromagnetic wave absorbing portion that covers at least the space between the resistor and the spark plug is provided in the insulating pipe portion, the electromagnetic noise absorbing portion can efficiently absorb the radiation noise and thereby suppress the emission of the radiation noise. The influence of radiation noise on peripheral devices can be reduced.
In addition, since the electromagnetic wave absorbing part covers the area between at least the ignition coil body and the ignition plug, it is possible to absorb the radiation noise in a wider area by the electromagnetic wave absorbing part and further suppress the emission of the radiation noise, so that the peripheral device The influence of radiation noise on can be further reduced.
In addition, since the cylindrical electromagnetic wave absorber is provided on one of the inside and the outside of the insulating pipe, the radiation noise in a wider area can be absorbed by the electromagnetic wave absorber and the emission of the radiation noise can be further suppressed. The influence of radiation noise on the device can be further reduced.
Since the electromagnetic wave absorbing portion is provided so as to cover at least the outer side of the rubber portion inserted into the plug hole, the radiated noise reflected from the inner peripheral surface of the plug hole and coming out of the plug hole is Since the electromagnetic wave absorbing section that is blocked absorbs and can suppress emission of radiation noise, the influence of radiation noise on peripheral devices can be further reduced.
Furthermore, since the electromagnetic wave absorption part is provided so as to cover the outside of the boot part, the radiation noise reflected on the inner peripheral surface of the plug hole can be efficiently absorbed by the electromagnetic wave absorption part in a wider area, thereby radiating noise to peripheral devices. Can be further reduced.
Furthermore, the electromagnetic wave absorption part is configured by laminating multiple electromagnetic wave absorption parts that absorb electromagnetic waves of different frequency characteristics, or the electromagnetic wave absorption part is mixed with multiple electromagnetic wave absorbers that absorb electromagnetic waves of different frequency characteristics Therefore, the influence of radiation noise in a wide frequency band can be reduced, and the reliability can be improved.
In addition, since the insulating pipe portion is composed of the electromagnetic wave absorber, the radiation noise can be efficiently absorbed by the electromagnetic wave absorber and the emission of the radiation noise can be suppressed, so that the influence of the radiation noise on the peripheral device can be reduced.
Since the electromagnetic wave absorber is composed of a mixture of a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics, the influence of radiation noise in a wide frequency band can be reduced, and reliability is improved. be able to.
Furthermore, since the rubber part was molded with a molding resin mixed with 10% by mass to 50% by mass of an electromagnetic wave absorbing material, the rubber part was reflected on the inner peripheral surface of the plug hole while ensuring the elasticity and shrinkage of the rubber part. The radiation of the noise coming out of the plug hole is absorbed by the electromagnetic wave absorbing material of the rubber part that closes the plug hole, and the emission of the radiation noise can be suppressed, thereby further reducing the influence of the radiation noise on the peripheral devices. it can.
And the electromagnetic wave absorber mixed with the molding resin for molding the rubber part contains at least 10% by mass of a plurality of electromagnetic wave absorbers that absorb electromagnetic waves of different frequency characteristics, respectively, and the total of the plurality of electromagnetic wave absorbers Therefore, the influence of radiation noise in a wide frequency band can be reduced, the reliability can be improved, and the elasticity and shrinkage of the rubber part can be ensured.
Further, since the boot portion is molded with a molding resin mixed with 10% by mass to 50% by mass of an electromagnetic wave absorbing material, the boot portion is reflected on the inner peripheral surface of the plug hole while ensuring the elasticity and shrinkage of the boot portion. Since the radiation noise can be efficiently absorbed by the electromagnetic wave absorber in the boot portion in a wider area, the influence of the radiation noise on the peripheral device can be further reduced.
The electromagnetic wave absorbing material mixed in the molding resin for molding the boot portion contains at least 10% by mass of plural electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics, respectively, and the total of the plural electromagnetic wave absorbing materials. Therefore, the influence of radiation noise in a wide frequency band can be reduced, the reliability can be improved, and the elasticity and shrinkage of the boot portion can be ensured.

以下、この発明の実施例を図に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１はこの発明の第１実施例である内燃機関用点火コイルの断面図であり、図５と同一または相当部分に同一符号を付し、その説明を省略する。 FIG. 1 is a cross-sectional view of an ignition coil for an internal combustion engine according to a first embodiment of the present invention. The same or corresponding parts as those in FIG.

図１において、絶縁性を有した円筒状の電磁波吸収部３１は、例えば、フェライトで構成され、抵抗２９と点火プラグ〔５１（頂部端子５２）〕との間を覆うように、プロテクタ部２３を構成する絶縁パイプ部２６の内側に配置されている。
この電磁波吸収部３１は、所定の周波数特性の電磁波を吸収して熱に変換するものである。 In FIG. 1, a cylindrical electromagnetic wave absorbing portion 31 having insulating properties is made of, for example, ferrite, and the protector portion 23 is disposed so as to cover between the resistor 29 and the spark plug [51 (top terminal 52)]. It arrange | positions inside the insulating pipe part 26 to comprise.
The electromagnetic wave absorber 31 absorbs an electromagnetic wave having a predetermined frequency characteristic and converts it into heat.

この第１実施例の内燃機関用点火コイル１によれば、抵抗２９と点火プラグ（５１）との間を電磁波吸収部３１で覆ったので、放射ノイズを効率よく電磁波吸収部３１に吸収させて放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響を低減させることができる。
また、電磁波吸収部３１を円筒状にしたので、電界集中を避けることができる。 According to the ignition coil 1 for the internal combustion engine of the first embodiment, since the space between the resistor 29 and the spark plug (51) is covered with the electromagnetic wave absorber 31, the radiated noise is efficiently absorbed by the electromagnetic wave absorber 31. Since the emission of radiation noise can be suppressed, the influence of radiation noise on peripheral devices can be reduced.
Moreover, since the electromagnetic wave absorber 31 is cylindrical, electric field concentration can be avoided.

図２はこの発明の第２実施例である内燃機関用点火コイルの断面図であり、図１および図５と同一または相当部分に同一符号を付し、その説明を省略する。 FIG. 2 is a cross-sectional view of an internal combustion engine ignition coil according to a second embodiment of the present invention. The same or corresponding parts as those in FIGS.

図２において、絶縁性を有した円筒状の電磁波吸収部３２は、例えば、フェライトで構成され、点火コイル本体１１（高圧タワー部１３Ｂまたは高圧端子２１）と点火プラグ〔５１（頂部端子５２）〕との間を覆うように、プロテクタ部２３を構成する絶縁パイプ部２６の外側に、絶縁パイプ部２６を覆うように配置されている。
この電磁波吸収部３２は、所定の周波数特性の電磁波を吸収して熱に変換するものである。 In FIG. 2, the cylindrical electromagnetic wave absorbing portion 32 having an insulating property is made of, for example, ferrite, and the ignition coil body 11 (the high voltage tower portion 13B or the high voltage terminal 21) and the ignition plug [51 (the top terminal 52)]. Is disposed outside the insulating pipe part 26 constituting the protector part 23 so as to cover the insulating pipe part 26.
The electromagnetic wave absorber 32 absorbs an electromagnetic wave having a predetermined frequency characteristic and converts it into heat.

この第２実施例の内燃機関用点火コイル１によれば、点火コイル本体１１と点火プラグ（５１）との間を電磁波吸収部３２で覆ったので、より広い領域の放射ノイズを電磁波吸収部３２に吸収させて放射ノイズの放出をさらに抑制できることにより、周辺機器への放射ノイズの影響をさらに低減させることができる。
また、電磁波吸収部３２を円筒状にしたので、電界集中を避けることができる。 According to the ignition coil 1 for the internal combustion engine of the second embodiment, since the space between the ignition coil main body 11 and the spark plug (51) is covered with the electromagnetic wave absorbing unit 32, the radiation noise in a wider area is reduced to the electromagnetic wave absorbing unit 32. The emission of radiation noise can be further suppressed and the influence of radiation noise on peripheral devices can be further reduced.
Moreover, since the electromagnetic wave absorber 32 is cylindrical, electric field concentration can be avoided.

図３はこの発明の第３実施例である内燃機関用点火コイルの断面図であり、図１、図２および図５と同一または相当部分に同一符号を付し、その説明を省略する。 FIG. 3 is a cross-sectional view of an internal combustion engine ignition coil according to a third embodiment of the present invention. The same reference numerals are assigned to the same or corresponding parts as in FIGS. 1, 2, and 5, and the description thereof is omitted.

図３において、絶縁性を有した円筒状の電磁波吸収部３２Ａは、点火コイル本体１１（高圧タワー部１３Ｂまたは高圧端子２１）と点火プラグ〔５１（頂部端子５２）〕との間を覆うように、プロテクタ部２３を構成する絶縁パイプ部２６の外側に、絶縁パイプ部２６を覆うように配置されている。
そして、電磁波吸収部３２Ａは、所定の周波数特性の電磁波を吸収するように、例えば、フェライトで円筒状に構成された第１電磁波吸収部３３Ａと、この第１電磁波吸収部３３Ａが吸収する周波数特性と異なる周波数特性の電磁波を吸収するように、例えば、フェライトで円筒状に構成され、第１電磁波吸収部３３Ａの外側に積層して重ね合わされた第２電磁波吸収部３４Ａとで構成されている。
この電磁波吸収部３２Ａは、複数の周波数特性の電磁波を吸収して熱に変換するものである。 In FIG. 3, a cylindrical electromagnetic wave absorbing portion 32 A having an insulating property covers the space between the ignition coil body 11 (the high voltage tower portion 13 B or the high voltage terminal 21) and the ignition plug [51 (top terminal 52)]. The insulation pipe part 26 is disposed outside the insulation pipe part 26 constituting the protector part 23.
The electromagnetic wave absorber 32A, for example, a first electromagnetic wave absorber 33A configured in a cylindrical shape with ferrite so as to absorb an electromagnetic wave having a predetermined frequency characteristic, and the frequency characteristics absorbed by the first electromagnetic wave absorber 33A. In order to absorb electromagnetic waves having different frequency characteristics, for example, it is composed of a second electromagnetic wave absorbing portion 34A that is formed in a cylindrical shape with ferrite and is laminated and overlapped on the outside of the first electromagnetic wave absorbing portion 33A.
The electromagnetic wave absorber 32A absorbs an electromagnetic wave having a plurality of frequency characteristics and converts it into heat.

この第３実施例の内燃機関用点火コイル１によれば、点火コイル本体１１と点火プラグ（５１）との間を電磁波吸収部３２Ａで覆ったので、より広い領域の放射ノイズを電磁波吸収部３２Ａに吸収させて放射ノイズの放出をさらに抑制できることにより、周辺機器への放射ノイズの影響をさらに低減させることができる。
そして、電磁波吸収部３２Ａが複数（２つ）の異なる周波数特性の電磁波を吸収するので、広範囲な周波数帯域の放射ノイズの影響を低減させることができ、信頼性を向上させることができる。
また、電磁波吸収部３２Ａを円筒状にしたので、電界集中を避けることができる。 According to the ignition coil 1 for the internal combustion engine of the third embodiment, since the space between the ignition coil main body 11 and the ignition plug (51) is covered with the electromagnetic wave absorber 32A, the radiation noise in a wider area is reduced to the electromagnetic wave absorber 32A. The emission of radiation noise can be further suppressed and the influence of radiation noise on peripheral devices can be further reduced.
Since the electromagnetic wave absorber 32A absorbs a plurality (two) of electromagnetic waves having different frequency characteristics, the influence of radiation noise in a wide frequency band can be reduced, and the reliability can be improved.
Moreover, since the electromagnetic wave absorbing portion 32A is cylindrical, electric field concentration can be avoided.

図４はこの発明の第４実施例である内燃機関用点火コイルの断面図であり、図１〜図３および図５と同一または相当部分に同一符号を付し、その説明を省略する。 FIG. 4 is a cross-sectional view of an internal combustion engine ignition coil according to a fourth embodiment of the present invention. The same reference numerals are assigned to the same or corresponding parts as in FIGS. 1 to 3 and FIG.

図４において、プロテクタ部２３を構成するラバー部２４Ａは、電磁波を吸収して熱に変換する絶縁性を有した電磁波吸収材、例えば、フェライトの粉粒体を混入させたゴムなどの成形樹脂（電磁波吸収体）を成形した弾性体である。
プロテクタ部２３を構成するブーツ部２５Ａは、電磁波を吸収して熱に変換する絶縁性を有した電磁波吸収材、例えば、フェライトの粉粒体を混入させたゴムなどの成形樹脂（電磁波吸収体）を成形した弾性体である。
プロテクタ部２３を構成する絶縁パイプ部２６Ａは、電磁波を吸収して熱に変換する絶縁性を有した電磁波吸収材、例えば、フェライトの粉粒体を混入させた成形樹脂（電磁波吸収体）を成形したものである。
なお、ラバー部２４Ａおよびブーツ部２５Ａを成形する成形樹脂には、電磁波吸収材を１０質量％未満混入させたのでは所期の目的を達成できず、また、電磁波吸収材を５０質量％を超えて混入させたのでは弾性、収縮性等を確保できないので、弾性、収縮性等を考慮して１０質量％〜５０質量％（好ましくは、電磁波吸収効率を落とさず、経済性をも考慮して１０質量％〜３０質量％。）の電磁波吸収材を混入するのが望ましい。
また、絶縁パイプ部２６Ａを成形する成形樹脂には、電磁波吸収材を１０質量％未満混入させたのでは所期の目的を達成できず、また、電磁波吸収材を８０質量％を超えて混入させても電磁波吸収効率が伸びないので、１０質量％〜８０質量％（好ましくは、電磁波吸収効率を落とさず、経済性を考慮して１０質量％〜３０質量％。）の電磁波吸収材をが混入するのが望ましい。 In FIG. 4, a rubber part 24A constituting the protector part 23 is an electromagnetic wave absorbing material having an insulating property that absorbs electromagnetic waves and converts them into heat, for example, a molding resin such as rubber mixed with ferrite particles. An electromagnetic wave absorber).
The boot portion 25A constituting the protector portion 23 is an electromagnetic wave absorbing material having an insulating property that absorbs electromagnetic waves and converts them into heat, for example, a molding resin (electromagnetic wave absorber) such as rubber mixed with ferrite particles. Is an elastic body.
The insulating pipe portion 26A constituting the protector portion 23 is formed of an electromagnetic wave absorbing material having an insulating property that absorbs electromagnetic waves and converts them into heat, for example, a molding resin (electromagnetic wave absorber) mixed with ferrite particles. It is a thing.
The molding resin for molding the rubber portion 24A and the boot portion 25A cannot achieve the intended purpose if the electromagnetic wave absorbing material is mixed in less than 10% by mass, and the electromagnetic wave absorbing material exceeds 50% by mass. If mixed, the elasticity, shrinkage, etc. cannot be ensured. Therefore, considering the elasticity, shrinkage, etc., 10% by mass to 50% by mass (preferably without reducing the electromagnetic wave absorption efficiency, also considering the economy) It is desirable to mix an electromagnetic wave absorbing material of 10 mass% to 30 mass%.
Further, if the electromagnetic wave absorbing material is mixed in less than 10% by mass in the molding resin for forming the insulating pipe portion 26A, the intended purpose cannot be achieved, and the electromagnetic wave absorbing material is mixed in exceeding 80% by mass. However, since the electromagnetic wave absorption efficiency does not increase, 10% by mass to 80% by mass (preferably 10% by mass to 30% by mass in consideration of economy) without mixing the electromagnetic wave absorption efficiency is mixed. It is desirable to do.

この第４実施例の内燃機関用点火コイル１によれば、ラバー部２４Ａ、ブーツ部２５Ａおよび絶縁パイプ部２６Ａを、電磁波吸収材（フェライトの粉粒体）を混入させた成形樹脂で成形したので、部品の形状を変えることなく、周辺機器への放射ノイズの影響を低減させることができる。
そして、エンジンヘッド（４１）のプラグホール（４２）内へ挿入される部分全体に電磁波吸収材が設けられているので、広い領域の放射ノイズを効率よく電磁波吸収材に吸収させて放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響を低減させることができるとともに、プラグホール（４２）の内周面で反射し、プラグホール（４２）から出ようとする放射ノイズを、プラグホール（４２）を閉塞するラバー部２４Ａ内の電磁波吸収材が吸収して放射ノイズの放出を抑制できることにより、周辺機器への放射ノイズの影響をさらに低減させることができる。
さらに、プラグホール（４２）の内周面で反射する放射ノイズを、ラバー部２４Ａ、ブーツ部２５Ａおよび絶縁パイプ部２６Ａの広い領域に位置する電磁波吸収材で効率よく吸収できることにより、周辺機器への放射ノイズの影響を一層低減させることができる。 According to the ignition coil 1 for the internal combustion engine of the fourth embodiment, the rubber portion 24A, the boot portion 25A, and the insulating pipe portion 26A are molded with a molding resin mixed with an electromagnetic wave absorbing material (ferrite granular material). The influence of radiation noise on peripheral devices can be reduced without changing the shape of the parts.
Since the electromagnetic wave absorbing material is provided on the entire portion of the engine head (41) inserted into the plug hole (42), the electromagnetic noise absorbing material can efficiently absorb the radiation noise in a wide area and release the radiation noise. Can reduce the influence of radiated noise on peripheral devices, and the radiated noise reflected from the inner peripheral surface of the plug hole (42) and going out from the plug hole (42) is reduced to the plug hole. Since the electromagnetic wave absorbing material in the rubber part 24A that closes (42) absorbs and can suppress the emission of radiation noise, the influence of radiation noise on peripheral devices can be further reduced.
Furthermore, the radiation noise reflected on the inner peripheral surface of the plug hole (42) can be efficiently absorbed by the electromagnetic wave absorber located in a wide area of the rubber portion 24A, the boot portion 25A, and the insulating pipe portion 26A. The influence of radiation noise can be further reduced.

上記した実施例では、絶縁パイプ部２６に円筒状の電磁波吸収部３１，３２，３２Ａを設けた例を示したが、絶縁パイプ部２６の全内周または全外周に電磁波吸収部を設けてもよく、また、電磁波吸収部３１，３２，３２Ａまたは絶縁パイプ部２６の全内周または全外周に設ける電磁波吸収部を、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収材を積層して構成したり、または、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収材を混合して構成してもよい。
このように、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収材を混合して電磁波吸収部３１，３２，３２Ａ、または、絶縁パイプ部２６の全内周または全外周に設ける電磁波吸収部を、例えば、焼成、成型、成形する場合、各電磁波吸収材は１０質量％〜８０質量％で、各電磁波吸収材の合計を１００質量％以下にする。 In the above-described embodiment, an example in which the cylindrical electromagnetic wave absorbing portions 31, 32, and 32 A are provided in the insulating pipe portion 26 is shown, but an electromagnetic wave absorbing portion may be provided on the entire inner periphery or the entire outer periphery of the insulating pipe portion 26. Well, the electromagnetic wave absorbers 31, 32, 32 A or the electromagnetic wave absorbers provided on the entire inner circumference or the outer circumference of the insulating pipe part 26 are made of a plurality (two or more) of electromagnetic wave absorbers that absorb electromagnetic waves having different frequency characteristics. A plurality of (two or more) electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics may be mixed.
In this way, a plurality of (two or more) electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics are mixed and provided on the entire inner circumference or the entire outer circumference of the electromagnetic wave absorbing portions 31, 32, 32A or the insulating pipe portion 26. For example, when the electromagnetic wave absorber is fired, molded, or molded, each electromagnetic wave absorber is 10% by mass to 80% by mass, and the total of the electromagnetic wave absorbers is 100% by mass or less.

次に、ラバー部２４の外側に電磁波吸収部を設ける例を示さなかったが、絶縁パイプ部２６と同様に、外側を覆うようにの電磁波吸収部を設けるとよい。
この電磁波吸収部は、単一の周波数特性の電磁波を吸収するものでも、または、複数（２つ以上）の異なる周波数特性の電磁波を吸収するものであってもよい。
なお、複数の異なる周波数特性の電磁波を吸収する電磁波吸収部は、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収部を積層して構成したり、または、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収材を混合し、例えば、焼成、成型、成形するが、各電磁波吸収材を少なくとも１０質量％含有させるとともに、各電磁波吸収材の合計を５０質量％以下にする。 Next, although the example which provides an electromagnetic wave absorption part in the outer side of the rubber part 24 was not shown, it is good to provide the electromagnetic wave absorption part so that the outer side may be covered like the insulating pipe part 26. FIG.
This electromagnetic wave absorber may absorb an electromagnetic wave having a single frequency characteristic, or may absorb a plurality (two or more) of electromagnetic waves having different frequency characteristics.
The electromagnetic wave absorber that absorbs a plurality of electromagnetic waves having different frequency characteristics may be configured by laminating a plurality (two or more) of electromagnetic wave absorbers that absorb electromagnetic waves having different frequency characteristics, or an electromagnetic wave having different frequency characteristics. A plurality of (two or more) electromagnetic wave absorbing materials that absorb water are mixed, for example, baked, molded, and molded. Each electromagnetic wave absorbing material is contained at least 10% by mass, and the total of each electromagnetic wave absorbing material is 50% by mass. Below.

次に、ブーツ部２５の外側に電磁波吸収部を設ける例を示さなかったが、絶縁パイプ部２６と同様に、外側を覆うようにの電磁波吸収部を設けるとよい。
この電磁波吸収部は、単一の周波数特性の電磁波を吸収するものでも、または、複数（２つ以上）の異なる周波数特性の電磁波を吸収するものであってもよい。
なお、複数の異なる周波数特性の電磁波を吸収する電磁波吸収部は、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収部を積層して構成したり、または、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収材を混合し、例えば、焼成、成型、成形するが、各電磁波吸収材を少なくとも１０質量％含有させるとともに、各電磁波吸収材の合計を５０質量％以下にする。 Next, although the example which provides an electromagnetic wave absorption part in the outer side of the boot part 25 was not shown, it is good to provide the electromagnetic wave absorption part so that the outer side may be covered like the insulating pipe part 26. FIG.
This electromagnetic wave absorber may absorb an electromagnetic wave having a single frequency characteristic, or may absorb a plurality (two or more) of electromagnetic waves having different frequency characteristics.
The electromagnetic wave absorber that absorbs a plurality of electromagnetic waves having different frequency characteristics may be configured by laminating a plurality (two or more) of electromagnetic wave absorbers that absorb electromagnetic waves having different frequency characteristics, or an electromagnetic wave having different frequency characteristics. A plurality of (two or more) electromagnetic wave absorbing materials that absorb water are mixed, for example, baked, molded, and molded. Each electromagnetic wave absorbing material is contained at least 10% by mass, and the total of each electromagnetic wave absorbing material is 50% by mass. Below.

次に、ラバー部２４Ａ、ブーツ部２５Ａおよび絶縁パイプ部２６Ａを、１つの電磁波吸収材を混入させた成形樹脂で成形した例を示したが、絶縁パイプ部２６Ａのみを、または、ラバー部２４Ａとブーツ部２５Ａとの少なくとも一方と、絶縁パイプ部２６Ａとを、１つの電磁波吸収材を混入させた成形樹脂で成形してもよい。
また、ラバー部２４Ａ、ブーツ部２５Ａおよび絶縁パイプ部２６Ａを、１つの電磁波吸収材を混入させた成形樹脂で成形した例を示したが、電磁波吸収材を、異なる周波数特性の電磁波を吸収する複数（２つ以上）の電磁波吸収材を混合した構成とし、この電磁波吸収材を混入させた成形樹脂で絶縁パイプ部２６Ａのみを、または、ラバー２４Ａ部とブーツ部２５Ａとの少なくとも一方と、絶縁パイプ部２６Ａとを成形してもよい。
なお、ラバー部２４Ａまたはブーツ部２５Ａを成形する成形樹脂に混入させる複数（２つ以上）の異なる周波数特性の電磁波を吸収する電磁波吸収材は、それぞれ少なくとも１０質量％で、その複数の電磁波吸収材の合計を５０質量％以下にする。
また、絶縁パイプ部２６Ａの製造に際して混入させる複数（２つ以上）の異なる周波数特性の電磁波を吸収する電磁波吸収材は、それぞれ少なくとも１０質量％で、その複数の電磁波吸収材の合計を１００質量％以下にし、例えば、焼成、成型、成形する。 Next, although the rubber part 24A, the boot part 25A, and the insulating pipe part 26A are shown as being molded with a molding resin mixed with one electromagnetic wave absorber, only the insulating pipe part 26A or the rubber part 24A is shown. At least one of the boot portion 25A and the insulating pipe portion 26A may be molded with a molding resin mixed with one electromagnetic wave absorbing material.
Moreover, although the rubber part 24A, the boot part 25A, and the insulating pipe part 26A have been shown to be molded with a molding resin in which one electromagnetic wave absorbing material is mixed, a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics are shown. (2 or more) electromagnetic wave absorbing materials are mixed, and only the insulating pipe portion 26A or at least one of the rubber 24A portion and the boot portion 25A is formed of the molding resin mixed with the electromagnetic wave absorbing material, and the insulating pipe. The portion 26A may be formed.
In addition, the electromagnetic wave absorbing material that absorbs a plurality (two or more) of electromagnetic waves having different frequency characteristics mixed in the molding resin for molding the rubber portion 24A or the boot portion 25A is at least 10% by mass, and the plurality of electromagnetic wave absorbing materials. Is 50% by mass or less.
In addition, the electromagnetic wave absorbing material that absorbs a plurality (two or more) of electromagnetic waves having different frequency characteristics to be mixed in the production of the insulating pipe portion 26A is at least 10% by mass, and the total of the plurality of electromagnetic wave absorbing materials is 100% by mass. For example, firing, molding, and molding are performed below.

次に、プロテクタ部２３をラバー部２４，２４Ａ、ブーツ部２５，２５Ａ、絶縁パイプ部２６，２６Ａの３部品で構成した例を示したが、１部品（ラバー部、ブーツ部および絶縁パイプ部が一体構造。）でも、２部品（ラバー部と絶縁パイプ部とを一体構造の一部品とし、これにブーツ部を取り付けた構成、または、ブーツ部と絶縁パイプ部とを一体構造の一部品とし、これにラバー部を取り付けた構成。）であってもよい。
また、二次コイル１８に誘起された高電圧を高圧端子２１、コイルスプリング２７、抵抗２９、コイルスプリング２８で点火プラグ５１の頂部電極５２へ供給する例を示したが、高圧端子２１およびコイルスプリング２７を省略し、抵抗２９を高圧端子２１のあった位置に配置する構成としてもよい。 Next, an example in which the protector portion 23 is composed of three parts, rubber portions 24 and 24A, boot portions 25 and 25A, and insulating pipe portions 26 and 26A, is shown. One component (rubber portion, boot portion, and insulating pipe portion includes Even in an integral structure.) Even two parts (a rubber part and an insulating pipe part as one part of an integral structure and a boot part attached thereto, or a boot part and an insulating pipe part as one part of an integral structure, The structure which attached the rubber part to this.) May be sufficient.
Moreover, although the example which supplies the high voltage induced by the secondary coil 18 to the top electrode 52 of the spark plug 51 with the high voltage terminal 21, the coil spring 27, the resistance 29, and the coil spring 28 was shown, the high voltage terminal 21 and the coil spring are shown. 27 may be omitted, and the resistor 29 may be arranged at the position where the high voltage terminal 21 is located.

この発明の第１実施例である内燃機関用点火コイルの断面図である。It is sectional drawing of the ignition coil for internal combustion engines which is 1st Example of this invention. この発明の第２実施例である内燃機関用点火コイルの断面図である。It is sectional drawing of the ignition coil for internal combustion engines which is 2nd Example of this invention. この発明の第３実施例である内燃機関用点火コイルの断面図である。It is sectional drawing of the ignition coil for internal combustion engines which is 3rd Example of this invention. この発明の第４実施例である内燃機関用点火コイルの断面図である。It is sectional drawing of the ignition coil for internal combustion engines which is 4th Example of this invention. 従来の内燃機関用点火コイルをエンジンヘッドに取り付けた状態の要部の断面図である。It is sectional drawing of the principal part of the state which attached the conventional ignition coil for internal combustion engines to the engine head.

Explanation of symbols

１内燃機関用点火コイル
１１点火コイル本体
１２絶縁ケース
１３Ａソケット部
１３Ｂ高圧タワー部
１３ｂ高圧端子挿入孔
１３Ｃ被取付部
１３ｃ被取付孔
１４コイル鉄心組立体
１５一次コイルボビン
１６一次コイル
１８二次コイル
１９鉄心
１９ａセンタ鉄心
１９ｂサイド鉄心
２０低圧端子（一次端子）
２１高圧端子（二次端子）
２２熱硬化性樹脂（絶縁材）
２３プロテクタ部
２４ラバー部
２４Ａラバー部
２５ブーツ部
２５Ａブーツ部
２６絶縁パイプ部
２６Ａ絶縁パイプ部
２７コイルスプリング（導電体）
２８コイルスプリング（導電体）
２９抵抗
３１電磁波吸収部
３２電磁波吸収部
３２Ａ電磁波吸収部
３３Ａ第１電磁波吸収部
３４Ａ第２電磁波吸収部
４１エンジンヘッド
４２プラグホール
４３取付ねじ孔
４４取付部
５１点火プラグ
５２頂部端子
５３中心電極
５４絶縁碍子
５５金具
５６雄ねじ部
５７電極
６１取付ねじ DESCRIPTION OF SYMBOLS 1 Ignition coil for internal combustion engines 11 Ignition coil body 12 Insulating case 13A Socket part 13B High voltage tower part 13b High voltage terminal insertion hole 13C Mounted part 13c Mounted hole 14 Coil core assembly 15 Primary coil bobbin 16 Primary coil 18 Secondary coil 19 Iron core 19a Center iron core 19b Side iron core 20 Low voltage terminal (primary terminal)
21 High voltage terminal (secondary terminal)
22 Thermosetting resin (insulating material)
23 protector part 24 rubber part 24A rubber part 25 boot part 25A boot part 26 insulating pipe part 26A insulating pipe part 27 coil spring (conductor)
28 Coil spring (conductor)
DESCRIPTION OF SYMBOLS 29 Resistance 31 Electromagnetic wave absorption part 32 Electromagnetic wave absorption part 32A Electromagnetic wave absorption part 33A 1st electromagnetic wave absorption part 34A 2nd electromagnetic wave absorption part 41 Engine head 42 Plug hole 43 Attachment screw hole 44 Attachment part 51 Spark plug 52 Top terminal 53 Center electrode 54 Insulation Insulator 55 Bracket 56 Male thread 57 Electrode 61 Mounting screw

Claims

An ignition coil body containing a coil core assembly in which an iron core penetrates a primary coil and a secondary coil in an insulating case;
A protector unit that supplies high voltage supplied from the ignition coil body to an ignition plug attached to the engine head,
This protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head, and the insulation of the spark plug The boot part attached to the insulator part, which insulates the high voltage, mechanically connecting the boot part and the rubber part, and the high voltage supplied from the secondary coil is attached to the engine head In an ignition coil for an internal combustion engine composed of a conductor to be supplied to a plug and an insulating pipe portion having a resistance,
An electromagnetic wave absorbing portion that covers at least between the resistor and the spark plug is provided in the insulating pipe portion,
An ignition coil for an internal combustion engine.

An ignition coil body containing a coil core assembly in which an iron core penetrates a primary coil and a secondary coil in an insulating case;
A protector unit that supplies high voltage supplied from the ignition coil body to an ignition plug attached to the engine head,
This protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head, and the insulation of the spark plug The boot part attached to the insulator part, which insulates the high voltage, mechanically connecting the boot part and the rubber part, and the high voltage supplied from the secondary coil is attached to the engine head In an ignition coil for an internal combustion engine composed of a conductor to be supplied to a plug and an insulating pipe portion having a resistance,
An electromagnetic wave absorbing portion that covers at least between the ignition coil body and the ignition plug is provided in the insulating pipe portion,
An ignition coil for an internal combustion engine.

An ignition coil body containing a coil core assembly in which an iron core penetrates a primary coil and a secondary coil in an insulating case;
A protector unit that supplies high voltage supplied from the ignition coil body to an ignition plug attached to the engine head,
This protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head, and the insulation of the spark plug The boot part attached to the insulator part, which insulates the high voltage, mechanically connecting the boot part and the rubber part, and the high voltage supplied from the secondary coil is attached to the engine head In an ignition coil for an internal combustion engine composed of a conductor to be supplied to a plug and an insulating pipe portion having a resistance,
Provided a cylindrical electromagnetic wave absorption part on one of the inside and the outside of the insulating pipe part,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to claim 3,
An electromagnetic wave absorbing portion is provided so as to cover at least the outside of the rubber portion inserted into the plug hole.
An ignition coil for an internal combustion engine.

The internal combustion engine ignition coil according to claim 3 or 4,
An electromagnetic wave absorbing portion was provided so as to cover the outside of the boot portion,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to any one of claims 1 to 5,
The electromagnetic wave absorber is formed by laminating a plurality of electromagnetic wave absorbers that absorb electromagnetic waves having different frequency characteristics.
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to any one of claims 1 to 5,
The electromagnetic wave absorbing portion is configured by mixing a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics,
An ignition coil for an internal combustion engine.

An ignition coil body containing a coil core assembly in which an iron core penetrates a primary coil and a secondary coil in an insulating case;
A protector unit that supplies high voltage supplied from the ignition coil body to an ignition plug attached to the engine head,
This protector part is attached to the insulating case, insulates the high voltage supplied from the secondary coil, and prevents the liquid from entering the plug hole of the engine head, and the insulation of the spark plug The boot part attached to the insulator part, which insulates the high voltage, mechanically connecting the boot part and the rubber part, and the high voltage supplied from the secondary coil is attached to the engine head In an ignition coil for an internal combustion engine composed of a conductor to be supplied to a plug and an insulating pipe portion having a resistance,
The insulating pipe part is composed of an electromagnetic wave absorber,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to claim 8,
The electromagnetic wave absorber is configured by mixing a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to claim 8 or 9,
The rubber part was molded with a molding resin mixed with 10% by mass to 50% by mass of an electromagnetic wave absorbing material,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to claim 10,
The electromagnetic wave absorbing material mixed in the molding resin for molding the rubber part contains at least 10% by mass of a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics, respectively, and the total of the plurality of electromagnetic wave absorbing materials is 50% by mass or less,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to any one of claims 8 to 11,
The boot part was molded with a molding resin mixed with 10% by mass to 50% by mass of an electromagnetic wave absorbing material,
An ignition coil for an internal combustion engine.

The ignition coil for an internal combustion engine according to claim 12,
The electromagnetic wave absorbing material mixed with the molding resin for molding the boot portion contains at least 10% by mass of a plurality of electromagnetic wave absorbing materials that absorb electromagnetic waves having different frequency characteristics, respectively, and the total of the plurality of electromagnetic wave absorbing materials is 50% by mass or less,
An ignition coil for an internal combustion engine.