JP2007162645A - Ignition coil for internal combustion engine - Google Patents

Ignition coil for internal combustion engine Download PDF

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JP2007162645A
JP2007162645A JP2005363039A JP2005363039A JP2007162645A JP 2007162645 A JP2007162645 A JP 2007162645A JP 2005363039 A JP2005363039 A JP 2005363039A JP 2005363039 A JP2005363039 A JP 2005363039A JP 2007162645 A JP2007162645 A JP 2007162645A
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ignition coil
internal combustion
combustion engine
pressure tower
end portion
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Hiromi Ide
博巳 井出
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Hanshin Electric Co Ltd
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Hanshin Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for an internal combustion engine capable of preventing a high-tension tower part and a high-tension joint from being damaged due to vibration during the handling and transportation by a time when it is mounted on an engine head after it is assembled. <P>SOLUTION: In this ignition coil 11 for the internal combustion engine, the high-tension tower part 22t installed in an insulating case 22 composing an ignition coil body 21 generating high voltage is connected to the cylindrical part 32 of the high-tension joint 31 for supplying the high voltage supplied from the ignition coil body 22 to an ignition plug with a connection rubber part 41. The high-tension tower part 22t is connected to the cylindrical high-tension joint 31 with the connection rubber part 41 without overlapping them with each other in the axial direction of the high-tension joint 31. <P>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に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 a 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の一例の概略構成を示す一部を断面にした正面図、図６は図５に示した内燃機関用点火コイルをエンジンヘッドに取り付けるときの説明図である。   FIG. 5 is a front view, partly in section, showing a schematic configuration of an example of a conventional internal combustion engine ignition coil, and FIG. 6 is an explanatory view when the internal combustion engine ignition coil shown in FIG. 5 is attached to an engine head. .

これらの図において、内燃機関用点火コイル１１は、高電圧を発生させる点火コイル本体２１と、この点火コイル本体２１から供給される高電圧を、エンジンヘッド６１のプラグホール６２の底に取り付けられた点火プラグ（図示省略）へ供給する高圧ジョイント３１と、この高圧ジョイント３１と点火コイル本体２１とを接続する接続ラバー部４１とで構成されている。   In these drawings, an ignition coil 11 for an internal combustion engine is attached to the bottom of a plug hole 62 of an engine head 61 with an ignition coil body 21 for generating a high voltage and a high voltage supplied from the ignition coil body 21. The high pressure joint 31 is supplied to an ignition plug (not shown), and the connection rubber portion 41 connects the high pressure joint 31 and the ignition coil body 21.

上記した点火コイル本体２１は、絶縁ケース２２と、この絶縁ケース２２内に収容された少なくとも、一次コイルボビン２３の外周に巻かれた一次コイル２４、この一次コイルの２４の外側に位置する二次コイル２５、および、一次コイル２４と二次コイル２５とを磁気的に結合する鉄心２６と、絶縁ケース２２内に充填され、絶縁ケース２２内に収容された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２７とで構成されている。
そして、絶縁ケース２２の左端部に一体的に設けられたソケット部２２ｓには、一次コイル２４または二次コイル２５に接続される複数の低圧端子（一次端子：図示省略）が設けられている。
また、絶縁ケース２２の下端部に一体的に設けられた筒状の高圧タワー部２２ｔには、内部に、二次コイル２５の一端に接続された高圧端子（二次端子）２９が収容され、外周に、周回係合突条２２ｔｉが設けられている。
なお、一次コイルボビン２３は、絶縁ケース２２に設けられた開口２２ｈを閉塞する状態で絶縁ケース２２内に収容されている。
そして、鉄心２６は、一部が絶縁ケース２２外に突出し、閉磁路を形成している。 The ignition coil main body 21 includes an insulating case 22, a primary coil 24 wound around the outer periphery of the primary coil bobbin 23 accommodated in the insulating case 22, and a secondary coil positioned outside the primary coil 24. 25, and an iron core 26 that magnetically couples the primary coil 24 and the secondary coil 25, and an insulation that fills the insulating case 22 and performs high-voltage insulation between the components housed in the insulating case 22. It is comprised with the thermosetting resin 27 as a material.
A plurality of low-voltage terminals (primary terminals: not shown) connected to the primary coil 24 or the secondary coil 25 are provided in the socket portion 22 s integrally provided at the left end portion of the insulating case 22.
The cylindrical high voltage tower portion 22t provided integrally with the lower end portion of the insulating case 22 accommodates therein a high voltage terminal (secondary terminal) 29 connected to one end of the secondary coil 25, A circumferential engagement protrusion 22ti is provided on the outer periphery.
The primary coil bobbin 23 is accommodated in the insulating case 22 so as to close the opening 22 h provided in the insulating case 22.
A part of the iron core 26 protrudes outside the insulating case 22 to form a closed magnetic circuit.

上記した高圧ジョイント３１は、絶縁樹脂製、例えば、ポリブチレンテレフタレート（ＰＢＴ）製の筒状部３２と、この筒状部３２の下端に取り付けられ、図示を省略した点火プラグの頂部電極に被さるブーツ部３３と、このブーツ部３３および筒状部３２内に収容され、点火コイル本体２１の高圧端子２９と点火プラグの頂部電極とを接続する、例えば、コイルスプリングなどの導電体３４とで構成されている。
そして、筒状部３２の上端外周には、接続ラバー部４１の周回嵌合溝４３ｇｕに嵌合する周回係合リブ３２ｉが設けられ、この周回係合リブ３２ｉよりも下側の筒状部３２の外周に、接続ラバー部４１の下端を突き当てることのできる突き当て部３２ｐが設けられている。 The above-described high-pressure joint 31 is made of an insulating resin, for example, a polybutylene terephthalate (PBT) cylindrical portion 32 and a boot that is attached to the lower end of the cylindrical portion 32 and covers the top electrode of the ignition plug (not shown). And a conductor 34 such as a coil spring that is housed in the boot portion 33 and the cylindrical portion 32 and connects the high voltage terminal 29 of the ignition coil body 21 and the top electrode of the spark plug. ing.
A circumferential engagement rib 32 i that fits in the circumferential fitting groove 43 gu of the connection rubber portion 41 is provided on the outer periphery of the upper end of the tubular portion 32, and the tubular portion 32 below the circumferential engagement rib 32 i. An abutting portion 32p that can abut the lower end of the connection rubber portion 41 is provided on the outer periphery of the connecting rubber portion 41.

上記した接続ラバー部４１は、絶縁性を有したゴム製で、点火コイル本体２１を構成する絶縁ケース２２の高圧タワー部２２ｔに取り付けられる被取付部４２と、この被取付部４２の下側に一体的に連なる接続部４３とで構成されている。
そして、被取付部４２から接続部４３を、その中心を貫通するように、点火コイル本体２１の高圧タワー部２２ｔが挿入される挿入孔４４が設けられている。
この挿入孔４４の周面には、高圧タワー部２２ｔの周回係合突条２２ｔｉが嵌合する周回嵌合溝４４ｇが設けられている。
また、接続部４３には、挿入孔４４の外側に周回させて、高圧ジョイント３１を構成する筒状部３２の上端部分（挿入部分）が挿入される収容溝４３ｇが設けられている。
さらに、収容溝４３ｇには、外側周面に周回させて、高圧ジョイント３１を構成する筒状部３２に設けられている周回係合リブ３２ｉが嵌合する周回嵌合溝４３ｇｕが設けられている。 The connection rubber portion 41 is made of rubber having an insulating property, and is attached to a mounting portion 42 attached to the high-voltage tower portion 22t of the insulating case 22 constituting the ignition coil body 21 and below the attached portion 42. It is comprised by the connection part 43 connected integrally.
And the insertion hole 44 in which the high voltage | pressure tower part 22t of the ignition coil main body 21 is inserted is provided so that the center of the connection part 43 may be penetrated from the to-be-attached part 42. FIG.
On the peripheral surface of the insertion hole 44, a circular fitting groove 44g into which the circular engagement protrusion 22ti of the high-pressure tower portion 22t is fitted is provided.
The connecting portion 43 is provided with an accommodation groove 43g that is circulated to the outside of the insertion hole 44 and into which the upper end portion (insertion portion) of the cylindrical portion 32 constituting the high-pressure joint 31 is inserted.
Further, the housing groove 43g is provided with a circumferential fitting groove 43gu that is circulated around the outer peripheral surface and into which a circumferential engagement rib 32i provided in the cylindrical portion 32 constituting the high-pressure joint 31 is fitted. .

この内燃機関用点火コイル１１は、高圧タワー部２２ｔの軸線Ｌ1と、高圧ジョイント３１（筒状部３２）の軸線Ｌ2とが同一直線上に位置するように組み立てられ、取り扱われる（例えば、特許文献１などを参照。）。 The ignition coil 11, the axis L 1 of the high voltage tower portion 22t, assembled as the axis L 2 of the high-pressure joint 31 (cylindrical portion 32) is positioned on the same straight line, are handled (e.g., (See Patent Document 1).

特開２００５−３１５１４８号公報JP 2005-315148 A

従来の内燃機関用点火コイル１１は、組み立ててエンジンヘッド６１へ取り付けるまでの間に、作業者の取扱、運搬の振動などにより、または、エンジンヘッド６１に取り付ける際、例えば、図６に示すように、ブーツ部３３の下端部がエンジンヘッド６１に接触し、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2がく字状に折れ曲がると、高圧タワー部２２ｔと筒状部３２とのオーバラップした部分に荷重が加わり、高圧タワー部２２ｔおよび／または筒状部３２が破損することがある。 The conventional ignition coil 11 for an internal combustion engine is assembled by the handling of the operator, vibration during transportation, etc., or when it is attached to the engine head 61, for example, as shown in FIG. When the lower end portion of the boot portion 33 comes into contact with the engine head 61 and the axis L 2 of the high pressure joint 31 is bent in a square shape with respect to the axis L 1 of the high pressure tower portion 22t, the high pressure tower portion 22t and the cylindrical portion In some cases, a load is applied to the overlapping portion with 32, and the high-pressure tower portion 22t and / or the tubular portion 32 may be damaged.

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、組み立てられてエンジンヘッドに取り付けるまでの間の取扱、運搬時の振動などによって高圧タワー部および高圧ジョイントが破損するのを防止す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 disadvantages, and prevents the high-pressure tower section and the high-pressure joint from being damaged due to handling during assembly and vibration during transportation from the time the assembly is mounted to the engine head. An ignition coil for an internal combustion engine that can be provided is provided.

この発明は、以下のような発明である。
（１）高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、前記高圧タワー部と前記筒状部とを前記高圧ジョイントの軸方向でオーバラップさせずに前記接続ラバー部で接続したことを特徴とする。
（２）高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、前記高圧タワー部の一端部と前記筒状部の一端部とを前記高圧ジョイントの軸方向でオーバラップさせるオーバラップ寸法値を、前記筒状部の一端部の内径寸法値から前記高圧タワー部の一端部の外径寸法値を引いた寸法値以下にして前記高圧タワー部の一端部と前記筒状部の一端部とを前記接続ラバー部で接続したことを特徴とする。
（３）高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、前記高圧タワー部の一端部と前記筒状部の一端部とを前記筒状部の一端部を外側にして前記高圧ジョイントの軸方向でオーバラップさせ、前記高圧タワー部の軸心に対して前記高圧ジョイントの軸心が屈曲しても、前記高圧タワー部の一端部が前記筒状部の一端部に衝合しないように前記筒状部の一端部を漏斗状に拡開させたことを特徴とする。
（４）高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、前記高圧タワー部の一端部と前記筒状部の一端部とを前記筒状部の一端部を外側にして前記高圧ジョイントの軸方向でオーバラップさせ、前記高圧タワー部の軸心に対して前記高圧ジョイントの軸心が屈曲しても、前記高圧タワー部の一端部が前記筒状部の一端部に衝合しないように前記高圧タワー部の一端部の外径を細くしたことを特徴とする。 The present invention is as follows.
(1) A high-voltage tower portion provided in an insulating case that constitutes an ignition coil main body that generates a high voltage, and a cylindrical portion of a high-pressure joint that supplies a high voltage supplied from the ignition coil main body to an ignition plug, In the internal combustion engine ignition coil connected by a connection rubber portion, the high pressure tower portion and the cylindrical portion are connected by the connection rubber portion without overlapping in the axial direction of the high pressure joint.
(2) a high-voltage tower portion provided in an insulating case constituting an ignition coil body that generates a high voltage, and a cylindrical portion of a high-pressure joint that supplies a high voltage supplied from the ignition coil body to an ignition plug, In the ignition coil for an internal combustion engine connected by a connecting rubber portion, an overlap dimension value for overlapping one end portion of the high pressure tower portion and one end portion of the cylindrical portion in the axial direction of the high pressure joint is set to the cylindrical portion. The one end portion of the high pressure tower portion and the one end portion of the tubular portion are connected to each other by the connection rubber portion so that the outer diameter size value of the one end portion of the high pressure tower portion is subtracted from the inner diameter dimension value of the one end portion. It is connected.
(3) a high-voltage tower portion provided in an insulating case constituting an ignition coil main body that generates a high voltage, and a cylindrical portion of a high-pressure joint that supplies a high voltage supplied from the ignition coil main body to an ignition plug, In the internal combustion engine ignition coil connected by a connecting rubber portion, one end portion of the high pressure tower portion and one end portion of the cylindrical portion overlap with each other in the axial direction of the high pressure joint with one end portion of the cylindrical portion facing outward. The cylindrical portion so that one end portion of the high pressure tower portion does not collide with one end portion of the tubular portion even if the axis of the high pressure joint is bent with respect to the axial center of the high pressure tower portion. One end is expanded in a funnel shape.
(4) a high-voltage tower provided in an insulating case that constitutes an ignition coil body that generates a high voltage, and a cylindrical part of a high-pressure joint that supplies a high voltage supplied from the ignition coil body to an ignition plug, In the internal combustion engine ignition coil connected by a connecting rubber part, the one end part of the high pressure tower part and the one end part of the cylindrical part overlap with each other in the axial direction of the high pressure joint with the one end part of the cylindrical part facing outside. The high-pressure tower portion is arranged so that one end portion of the high-pressure tower portion does not collide with one end portion of the tubular portion even if the axis of the high-pressure joint is bent with respect to the axis of the high-pressure tower portion. It is characterized in that the outer diameter of one end is reduced.

この発明によれば、高圧タワー部と筒状部とを高圧ジョイントの軸方向でオーバラップさせずに接続ラバー部で接続したので、または、高圧タワー部の一端部と筒状部の一端部とを高圧ジョイントの軸方向でオーバラップさせるオーバラップ寸法値を、筒状部の一端部の内径寸法値から高圧タワー部の一端部の外径寸法値を引いた寸法値以下にして高圧タワー部の一端部と筒状部の一端部とを接続ラバー部で接続したので、または、高圧タワー部の一端部と筒状部の一端部とを筒状部の一端部を外側にして高圧ジョイントの軸方向でオーバラップさせ、高圧タワー部の軸心に対して高圧ジョイントの軸心が屈曲しても、高圧タワー部の一端部が筒状部の一端部に衝合しないように筒状部の一端部を漏斗状に拡開させたので、または、高圧タワー部の一端部と筒状部の一端部とを筒状部の一端部を外側にして高圧ジョイントの軸方向でオーバラップさせ、高圧タワー部の軸心に対して高圧ジョイントの軸心が屈曲しても、高圧タワー部の一端部が筒状部の一端部に衝合しないように高圧タワー部の一端部の外径を細くしたので、高圧タワー部の軸心に対して高圧ジョイントの軸心が折れ曲がっても、高圧タワー部の一端部と筒状部の一端部とに破損させる荷重がかからなくなり、高圧タワー部および高圧ジョイントが破損するのを防止することができる。   According to this invention, the high pressure tower portion and the tubular portion are connected by the connecting rubber portion without overlapping in the axial direction of the high pressure joint, or one end portion of the high pressure tower portion and one end portion of the tubular portion The overlap dimension value that overlaps the high-pressure joint in the axial direction is less than or equal to the dimension value obtained by subtracting the outer diameter dimension value of one end of the high-pressure tower from the inner diameter dimension of one end of the cylindrical part. Since one end and one end of the tubular part are connected by a connecting rubber part, or one end of the high-pressure tower part and one end of the tubular part are outside the one end of the tubular part, the shaft of the high-pressure joint One end of the cylindrical part so that one end of the high-pressure tower does not abut against one end of the cylindrical part even if the axis of the high-pressure joint is bent with respect to the axis of the high-pressure tower. Part expanded in a funnel shape, or One end of the cylindrical portion and one end of the cylindrical portion are overlapped in the axial direction of the high pressure joint with one end of the cylindrical portion facing outward, and the axis of the high pressure joint is bent with respect to the axis of the high pressure tower. However, the outer diameter of one end of the high-pressure tower is reduced so that the one end of the high-pressure tower does not abut against the one end of the cylindrical portion. Even if it bends, the load which damages to the one end part of a high voltage | pressure tower part and the one end part of a cylindrical part is no longer applied, and it can prevent that a high voltage | pressure tower part and a high voltage | pressure joint are damaged.

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要部の構成を示す一部を断面にした部分正面図であり、図５または図６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 partial front view, partly in section, showing the structure of the essential part of an ignition coil for an internal combustion engine according to a first embodiment of the present invention. The same reference numerals are used for the same or corresponding parts as FIG. A description thereof will be omitted.

この第１実施例が、図５および図６に示した従来例と異なるところは、高圧タワー部２２ｔと、高圧ジョイント３１を構成する筒状部３２とを、高圧ジョイント３１の軸方向でオーバラップさせずに接続ラバー部４１で接続した点である。   The first embodiment differs from the conventional example shown in FIGS. 5 and 6 in that the high-pressure tower portion 22t and the cylindrical portion 32 constituting the high-pressure joint 31 overlap in the axial direction of the high-pressure joint 31. This is a point where the connection rubber part 41 is used for connection.

このように、高圧タワー部２２ｔと筒状部３２とを高圧ジョイント３１の軸方向でオーバラップさせずに接続ラバー部４１で接続すると、組み立ててエンジンヘッドに取り付けられるまでの間に、作業者の取扱、運搬時の振動などにより、または、内燃機関用点火コイル１１をエンジンヘッドに取り付ける際、例えば、図６に示すように、ブーツ部３３の下端部がエンジンヘッド６１に接触し、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2がく字状に折れ曲がっても、高圧タワー部２２ｔの一端部と筒状部３２の一端部とに破損させる荷重がかからなくなり、高圧タワー部２２ｔおよび高圧ジョイント３１（筒状部３２）が破損するのを防止することができる。 In this way, when the high pressure tower portion 22t and the cylindrical portion 32 are connected by the connection rubber portion 41 without overlapping in the axial direction of the high pressure joint 31, it is necessary for the operator to assemble until it is attached to the engine head. When the internal combustion engine ignition coil 11 is attached to the engine head due to vibration during handling, transportation, or the like, for example, as shown in FIG. Even if the shaft center L 2 of the high pressure joint 31 is bent in a square shape with respect to the shaft center L 1 of 22 t, no load is applied to one end portion of the high pressure tower portion 22 t and one end portion of the tubular portion 32, It is possible to prevent the high-pressure tower portion 22t and the high-pressure joint 31 (tubular portion 32) from being damaged.

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要部の構成を示す一部を断面にした部分正面図であり、図１、図５または図６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 partial front view, partly in section, showing the configuration of the essential part of an ignition coil for an internal combustion engine according to a second embodiment of the present invention, which is the same as or corresponding to FIG. 1, FIG. The same reference numerals are given and description thereof is omitted.

この第２実施例が、図５および図６に示した従来例と異なるところは、高圧タワー部２２ｔの一端部と高圧ジョイント３１を構成する筒状部３２の一端部とを高圧ジョイント３１の軸方向でオーバラップさせるオーバラップ寸法値ａを、筒状部３２の一端部の内径寸法値ｂから高圧タワー部２２ｔの一端部の外径寸法値ｃを引いた寸法値以下にして高圧タワー部２２ｔの一端部と筒状部３２の一端部とを接続ラバー部４１で接続した点である。   The second embodiment differs from the conventional example shown in FIGS. 5 and 6 in that one end of the high-pressure tower 22t and one end of the cylindrical portion 32 constituting the high-pressure joint 31 are connected to the shaft of the high-pressure joint 31. The overlap dimension value a to be overlapped in the direction is made equal to or less than the dimension value obtained by subtracting the outer diameter dimension value c of one end of the high-pressure tower portion 22t from the inner diameter dimension value b of the one end portion of the cylindrical portion 32. This is that a connecting rubber part 41 connects the one end of the cylindrical part 32 and one end of the cylindrical part 32.

このように、高圧タワー部２２ｔの一端部と筒状部３２の一端部とを高圧ジョイント３１（筒状部３２）の軸方向でオーバラップさせるオーバラップ寸法値ａを、筒状部３２の一端部の内径寸法値ｂから高圧タワー部２２ｔの一端部の外径寸法値ｃを引いた寸法値以下にして高圧タワー部２２ｔの一端部と筒状部３２の一端部とを接続ラバー部４１で接続すると、組み立ててエンジンヘッドに取り付けられるまでの間に、作業者の取扱、運搬時の振動などにより、または、内燃機関用点火コイル１１をエンジンヘッドに取り付ける際、例えば、図６に示すように、ブーツ部３３の下端部がエンジンヘッド６１に接触し、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2がく字状に折れ曲がっても、高圧タワー部２２ｔの一端部と筒状部３２の一端部とに破損させる荷重がかからなくなり、高圧タワー部２２ｔおよび高圧ジョイント３１（筒状部３２）が破損するのを防止することができる。 Thus, the overlap dimension value a that overlaps one end of the high-pressure tower portion 22 t and one end of the tubular portion 32 in the axial direction of the high-pressure joint 31 (tubular portion 32) is set to one end of the tubular portion 32. The connection rubber part 41 connects the one end part of the high-pressure tower part 22t and the one end part of the tubular part 32 to a dimension value obtained by subtracting the outer diameter dimension value c of one end part of the high-pressure tower part 22t from the inner diameter dimension value b of the part. When the connection is made and before the engine head is attached to the engine head, it may be handled by a worker, vibration during transportation, or when the internal combustion engine ignition coil 11 is attached to the engine head, for example, as shown in FIG. Even if the lower end portion of the boot portion 33 comes into contact with the engine head 61 and the axis L 2 of the high pressure joint 31 is bent in a square shape with respect to the axis L 1 of the high pressure tower portion 22t, The load to be damaged is not applied to the end portion and one end portion of the cylindrical portion 32, and the high-pressure tower portion 22t and the high-pressure joint 31 (cylindrical portion 32) can be prevented from being damaged.

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要部の構成を示す一部を断面にした部分正面図であり、図１、図２、図５または図６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 partial front view, partly in section, showing the structure of the main part of an ignition coil for an internal combustion engine according to a third embodiment of the present invention, which is the same as FIG. 1, FIG. 2, FIG. Corresponding portions are denoted by the same reference numerals, and description thereof is omitted.

この第３実施例が、図５および図６に示した従来例と異なるところは、高圧タワー部２２ｔの一端部と高圧ジョイント３１を構成する筒状部３２の一端部とを筒状部３２の一端部を外側にして高圧ジョイント３１の軸方向でオーバラップさせ、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2が屈曲しても、高圧タワー部２２ｔの一端部が筒状部３２の一端部に衝合しないように筒状部３２の一端部を漏斗状に拡開させた点である。 The third embodiment differs from the conventional example shown in FIGS. 5 and 6 in that one end of the high pressure tower portion 22t and one end portion of the cylindrical portion 32 constituting the high pressure joint 31 are connected to the cylindrical portion 32. one end portion in the outer to overlap in the axial direction of the high-pressure joint 31, be the axis L 2 of the high-pressure joint 31 is bent with respect to the axis L 1 of the high voltage tower portion 22t, one end of the high voltage tower portion 22t However, one end of the cylindrical portion 32 is expanded in a funnel shape so as not to abut against one end of the cylindrical portion 32.

このように、高圧タワー部２２ｔの一端部と筒状部３２の一端部とを筒状部３２の一端部を外側にして高圧ジョイント３１の軸方向でオーバラップさせ、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１（筒状部３２）の軸心Ｌ2が屈曲しても、高圧タワー部２２ｔの一端部が筒状部３２の一端部に衝合しないように筒状部３２の一端部を漏斗状に拡開させると、組み立ててエンジンヘッドに取り付けられるまでの間に、作業者の取扱、運搬時の振動などにより、または、内燃機関用点火コイル１１をエンジンヘッドに取り付ける際、例えば、図６に示すように、ブーツ部３３の下端部がエンジンヘッド６１に接触し、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2がく字状に折れ曲がっても、高圧タワー部２２ｔの一端部と筒状部３２の一端部とに破損させる荷重がかからなくなり、高圧タワー部２２ｔおよび高圧ジョイント３１（筒状部３２）が破損するのを防止することができる。 In this way, one end of the high-pressure tower portion 22t and one end portion of the cylindrical portion 32 are overlapped in the axial direction of the high-pressure joint 31 with one end portion of the cylindrical portion 32 facing outward, and the axial center of the high-pressure tower portion 22t. Even if the axis L 2 of the high-pressure joint 31 (cylindrical portion 32) is bent with respect to L 1 , the cylindrical portion 32 so that one end portion of the high-pressure tower portion 22 t does not collide with one end portion of the cylindrical portion 32. When one end of the battery is expanded in the form of a funnel, during assembly and mounting to the engine head, due to handling by the operator, vibration during transportation, or when the ignition coil 11 for an internal combustion engine is mounted to the engine head For example, as shown in FIG. 6, the lower end portion of the boot portion 33 is in contact with the engine head 61, and the axis L 2 of the high pressure joint 31 is bent in a square shape with respect to the axis L 1 of the high pressure tower portion 22 t. The high pressure tower It will not be subjected to loads damaging the one end portion of 2t end portion and the cylindrical portion 32, high voltage tower portion 22t and a high-pressure joint 31 (cylindrical portion 32) can be prevented from being damaged.

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要部の構成を示す一部を断面にした部分正面図であり、図１〜図３、図５または図６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 partial front view, partly in section, showing the configuration of the main part of an ignition coil for an internal combustion engine according to a fourth embodiment of the present invention, which is the same as FIG. 1 to FIG. 3, FIG. Corresponding portions are denoted by the same reference numerals, and description thereof is omitted.

この第４実施例が、図５および図６に示した従来例と異なるところは、高圧タワー部２２ｔの一端部と高圧ジョイント３１を構成する筒状部３２の一端部とを筒状部３２の一端部を外側にして高圧ジョイント３１の軸方向でオーバラップさせ、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2が屈曲しても、高圧タワー部２２ｔの一端部が筒状部３２の一端部に衝合しないように高圧タワー部２２ｔの一端部の外径を細くした点である。 The fourth embodiment differs from the conventional example shown in FIGS. 5 and 6 in that one end of the high-pressure tower 22t and one end of the cylindrical portion 32 constituting the high-pressure joint 31 are connected to the cylindrical portion 32. one end portion in the outer to overlap in the axial direction of the high-pressure joint 31, be the axis L 2 of the high-pressure joint 31 is bent with respect to the axis L 1 of the high voltage tower portion 22t, one end of the high voltage tower portion 22t However, the outer diameter of one end portion of the high-pressure tower portion 22t is reduced so as not to collide with one end portion of the cylindrical portion 32.

このように、高圧タワー部２２ｔの一端部と筒状部３２の一端部とを筒状部３２の一端部を外側にして高圧ジョイント３１の軸方向でオーバラップさせ、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2が屈曲しても、高圧タワー部２２ｔの一端部が筒状部３２の一端部に衝合しないように高圧タワー部２２ｔの一端部の外径を細くすると、組み立ててエンジンヘッドに取り付けられるまでの間に、作業者の取扱、運搬時の振動などにより、または、内燃機関用点火コイル１１をエンジンヘッドに取り付ける際、例えば、図６に示すように、ブーツ部３３の下端部がエンジンヘッド６１に接触し、高圧タワー部２２ｔの軸心Ｌ1に対して高圧ジョイント３１の軸心Ｌ2がく字状に折れ曲がっても、高圧タワー部２２ｔの一端部と筒状部３２の一端部とに破損させる荷重がかからなくなり、高圧タワー部２２ｔおよび高圧ジョイント３１（筒状部３２）が破損するのを防止することができる。 In this way, one end of the high-pressure tower portion 22t and one end portion of the cylindrical portion 32 are overlapped in the axial direction of the high-pressure joint 31 with one end portion of the cylindrical portion 32 facing outward, and the axial center of the high-pressure tower portion 22t. Even if the axis L 2 of the high pressure joint 31 is bent with respect to L 1 , the outer diameter of the one end portion of the high pressure tower portion 22 t does not collide with one end portion of the cylindrical portion 32. When the internal combustion engine ignition coil 11 is attached to the engine head, for example, as shown in FIG. the lower end portion of the boot 33 is in contact with the engine head 61, also bent in the axis L 2 calyx-shaped high-pressure joint 31 with respect to the axis L 1 of the high voltage tower portion 22t, of the high voltage tower portion 22t one It will not be subjected to loads to be damaged and parts and one end of the cylindrical portion 32, high voltage tower portion 22t and a high-pressure joint 31 (cylindrical portion 32) can be prevented from being damaged.

上記した実施例では、筒状部３２とブーツ部３３とを別体構成にした高圧ジョイント３１を例に示したが、筒状部とブーツ部とを一体構成にしたものであってもよい。   In the above-described embodiment, the high-pressure joint 31 in which the cylindrical portion 32 and the boot portion 33 are separately configured is shown as an example, but the cylindrical portion and the boot portion may be integrated.

この発明の第１実施例である内燃機関用点火コイルの要部の構成を示す一部を断面にした部分正面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial front view, partly in cross section, showing the configuration of the main part of an internal combustion engine ignition coil according to a first embodiment of the present 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要部の構成を示す一部を断面にした部分正面図である。It is the partial front view which made a part the cross section which shows the structure of the principal part 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要部の構成を示す一部を断面にした部分正面図である。It is the partial front view which made a part the cross section which shows the structure of the principal part 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要部の構成を示す一部を断面にした部分正面図である。It is the fragmentary front view which made a part the cross section which shows the structure of the principal part 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の一例の概略構成を示す一部を断面にした正面図である。It is the front view which made the cross section the part which shows schematic structure of an example of the conventional ignition coil for internal combustion engines. 図５に示した内燃機関用点火コイルをエンジンヘッドに取り付けるときの説明図である。It is explanatory drawing when attaching the ignition coil for internal combustion engines shown in FIG. 5 to an engine head.

符号の説明Explanation of symbols

１１ 内燃機関用点火コイル
２１ 点火コイル本体
２２ 絶縁ケース
２２ｈ 開口
２２ｓ ソケット部
２２ｔ 高圧タワー部
２２ｔｉ 周回係合突条
２３ 一次コイルボビン
２４ 一次コイル
２５ 二次コイル
２６ 鉄心
２７ 熱硬化性樹脂（絶縁材）
２９ 高圧端子（二次端子）
３１ 高圧ジョイント
３２ 筒状部
３２ｉ 周回係合リブ
３２ｐ 突き当て部
３３ ブーツ部
３４ 導電体
４１ 接続ラバー部
４２ 被取付部
４３ 接続部
４３ｇ 収容溝
４３ｇｕ 周回嵌合溝
４４ 挿入孔
４４ｇ 周回嵌合溝
６１ エンジンヘッド
６２ プラグホール
Ｌ1 高圧タワー部２２ｔの軸心
Ｌ2 高圧ジョイント３１（筒状部３２）の軸心
ａ オーバラップ寸法値
ｂ 筒状部３２の一端部の内径寸法値
ｃ 高圧タワー部２２ｔの一端部の外径寸法値 DESCRIPTION OF SYMBOLS 11 Ignition coil for internal combustion engines 21 Ignition coil main body 22 Insulation case 22h Opening 22s Socket part 22t High voltage tower part 22ti Circumferential engagement protrusion 23 Primary coil bobbin 24 Primary coil 25 Secondary coil 26 Iron core 27 Thermosetting resin (insulating material)
29 High voltage terminal (secondary terminal)
31 High-pressure joint 32 Cylindrical portion 32i Circumferential engagement rib 32p Abutting portion 33 Boot portion 34 Conductor 41 Connection rubber portion 42 Mounted portion 43 Connection portion 43g Housing groove 43gu Circumferential engagement groove 44 Insertion hole 44g Circumferential engagement groove 61 Engine head 62 Plug hole L 1 Axial center of high-pressure tower portion 22 t L 2 Axial center of high-pressure joint 31 (cylindrical portion 32) a Overlapping dimension value b Inner diameter dimension value of one end portion of cylindrical portion 32 c High-pressure tower portion 22 t Outer diameter value of one end of

Claims (4)

高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、
前記高圧タワー部と前記筒状部とを前記高圧ジョイントの軸方向でオーバラップさせずに前記接続ラバー部で接続した、
ことを特徴とする内燃機関用点火コイル。 A high pressure tower portion provided in an insulating case that constitutes an ignition coil body that generates a high voltage, and a cylindrical portion of a high pressure joint that supplies high voltage supplied from the ignition coil body to the ignition plug are connected to a rubber portion. In the internal combustion engine ignition coil connected at
The high pressure tower portion and the cylindrical portion are connected by the connection rubber portion without overlapping in the axial direction of the high pressure joint,
An ignition coil for an internal combustion engine. 高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、
前記高圧タワー部の一端部と前記筒状部の一端部とを前記高圧ジョイントの軸方向でオーバラップさせるオーバラップ寸法値を、前記筒状部の一端部の内径寸法値から前記高圧タワー部の一端部の外径寸法値を引いた寸法値以下にして前記高圧タワー部の一端部と前記筒状部の一端部とを前記接続ラバー部で接続した、
ことを特徴とする内燃機関用点火コイル。 A high pressure tower portion provided in an insulating case that constitutes an ignition coil body that generates a high voltage, and a cylindrical portion of a high pressure joint that supplies high voltage supplied from the ignition coil body to the ignition plug are connected to a rubber portion. In the internal combustion engine ignition coil connected at
An overlap dimension value for overlapping one end portion of the high pressure tower portion and one end portion of the cylindrical portion in the axial direction of the high pressure joint is determined from an inner diameter dimension value of the one end portion of the cylindrical portion. The one end portion of the high-pressure tower portion and the one end portion of the tubular portion were connected by the connection rubber portion below the dimension value obtained by subtracting the outer diameter dimension value of the one end portion,
An ignition coil for an internal combustion engine. 高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部の筒状部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントとを、接続ラバー部で接続した内燃機関用点火コイルにおいて、
前記高圧タワー部の一端部と前記筒状部の一端部とを前記筒状部の一端部を外側にして前記高圧ジョイントの軸方向でオーバラップさせ、
前記高圧タワー部の軸心に対して前記高圧ジョイントの軸心が屈曲しても、前記高圧タワー部の一端部が前記筒状部の一端部に衝合しないように前記筒状部の一端部を漏斗状に拡開させた、
ことを特徴とする内燃機関用点火コイル。 A connecting rubber portion includes a cylindrical portion of a high-voltage tower portion provided in an insulating case that constitutes an ignition coil body that generates a high voltage, and a high-pressure joint that supplies a high voltage supplied from the ignition coil body to an ignition plug. In the internal combustion engine ignition coil connected at
One end of the high-pressure tower portion and one end of the tubular portion are overlapped in the axial direction of the high-pressure joint with one end portion of the tubular portion being outside,
One end portion of the cylindrical portion so that one end portion of the high pressure tower portion does not collide with one end portion of the cylindrical portion even if the axis of the high pressure joint is bent with respect to the axial center of the high pressure tower portion. Expanded into a funnel shape,
An ignition coil for an internal combustion engine. 高電圧を発生させる点火コイル本体を構成する絶縁ケースに設けられた高圧タワー部と、この点火コイル本体から供給される高電圧を点火プラグへ供給する高圧ジョイントの筒状部とを、接続ラバー部で接続した内燃機関用点火コイルにおいて、
前記高圧タワー部の一端部と前記筒状部の一端部とを前記筒状部の一端部を外側にして前記高圧ジョイントの軸方向でオーバラップさせ、
前記高圧タワー部の軸心に対して前記高圧ジョイントの軸心が屈曲しても、前記高圧タワー部の一端部が前記筒状部の一端部に衝合しないように前記高圧タワー部の一端部の外径を細くした、
ことを特徴とする内燃機関用点火コイル。 A high pressure tower portion provided in an insulating case that constitutes an ignition coil body that generates a high voltage, and a cylindrical portion of a high pressure joint that supplies high voltage supplied from the ignition coil body to the ignition plug are connected to a rubber portion. In the internal combustion engine ignition coil connected at
One end of the high-pressure tower portion and one end of the tubular portion are overlapped in the axial direction of the high-pressure joint with one end portion of the tubular portion being outside,
One end portion of the high-pressure tower portion so that one end portion of the high-pressure tower portion does not collide with one end portion of the cylindrical portion even if the axis of the high-pressure joint is bent with respect to the axis of the high-pressure tower portion. The outer diameter of the
An ignition coil for an internal combustion engine.
JP2005363039A 2005-12-16 2005-12-16 Ignition coil for internal combustion engine Pending JP2007162645A (en)

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JP2005363039A JP2007162645A (en) 2005-12-16 2005-12-16 Ignition coil for internal combustion engine

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08144917A (en) * 1994-11-22 1996-06-04 Sumitomo Wiring Syst Ltd Connecting structure between spark plug and ignition coil of internal combustion engine
JPH08261127A (en) * 1995-03-20 1996-10-08 Mitsubishi Electric Corp Ignition device for internal combustion engine
JP2001227442A (en) * 2000-02-18 2001-08-24 Hanshin Electric Co Ltd Ignition coil with plug joint

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08144917A (en) * 1994-11-22 1996-06-04 Sumitomo Wiring Syst Ltd Connecting structure between spark plug and ignition coil of internal combustion engine
JPH08261127A (en) * 1995-03-20 1996-10-08 Mitsubishi Electric Corp Ignition device for internal combustion engine
JP2001227442A (en) * 2000-02-18 2001-08-24 Hanshin Electric Co Ltd Ignition coil with plug joint

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