JP6903545B2 - Ignition coil for internal combustion engine - Google Patents

Ignition coil for internal combustion engine Download PDF

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JP6903545B2
JP6903545B2 JP2017199356A JP2017199356A JP6903545B2 JP 6903545 B2 JP6903545 B2 JP 6903545B2 JP 2017199356 A JP2017199356 A JP 2017199356A JP 2017199356 A JP2017199356 A JP 2017199356A JP 6903545 B2 JP6903545 B2 JP 6903545B2
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voltage terminal
ignition coil
miscellaneous
resistor
case
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JP2019074001A (en
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雅晶 堀
雅晶 堀
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Hitachi Astemo Hanshin Ltd
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Hitachi Astemo Hanshin Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12—Ignition, e.g. for IC engines

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Description

本発明は、内燃機関の点火プラグに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 to a spark plug of an internal combustion engine.

点火プラグに放電火花を生じさせる高電圧は、１次側コイルと２次側コイルとを備えた点火コイルを用いて発生させている。
上記の高電圧は、点火コイルの１次側コイルに流れる電流を遮断したときに励起されることから、点火プラグが放電を一定期間継続するときに障害となる電気ノイズ（不要な電圧変動）を含んでいる。この電気ノイズの影響を抑えるため、例えば、高電圧を出力する２次側コイルの一端と点火プラグの中心電極との間に雑防抵抗を直列接続したものがある（例えば、特許文献１参照）。 The high voltage that causes a discharge spark in the spark plug is generated by using an ignition coil including a primary coil and a secondary coil.
Since the above high voltage is excited when the current flowing through the primary coil of the ignition coil is cut off, electrical noise (unnecessary voltage fluctuation) that becomes an obstacle when the spark plug continues to discharge for a certain period of time is generated. Includes. In order to suppress the influence of this electrical noise, for example, there is one in which a miscellaneous resistance resistor is connected in series between one end of a secondary coil that outputs a high voltage and the center electrode of a spark plug (see, for example, Patent Document 1). ..

図３は、従来の内燃機関用点火コイルの構成を示す説明図である。この図は、点火コイル本体１０１を内蔵した高圧タワー１００の内部構成を示す部分断面図であり、高圧タワー１００下部の、点火プラグの頭部電極等と接続する部位の図示を省略している。なお、ここで例示する内燃機関用点火コイルは、内燃機関に設置固定された点火プラグ（図示省略）に直接接続する高圧タワー１００として形成されたものである。
高圧タワー１００は、点火コイル本体１０１を内蔵するケース１０２と、ケース１０２の下端から内燃機関に設置されている点火プラグの頭部電極へ向かって延設されたプロテクタ１０３によって構成されている。 FIG. 3 is an explanatory diagram showing the configuration of a conventional ignition coil for an internal combustion engine. This figure is a partial cross-sectional view showing the internal configuration of the high-pressure tower 100 incorporating the ignition coil main body 101, and the illustration of the portion of the lower part of the high-pressure tower 100 connected to the head electrode of the spark plug or the like is omitted. The ignition coil for an internal combustion engine illustrated here is formed as a high-pressure tower 100 that is directly connected to a spark plug (not shown) installed and fixed in the internal combustion engine.
The high-pressure tower 100 is composed of a case 102 containing the ignition coil main body 101 and a protector 103 extending from the lower end of the case 102 toward the head electrode of the spark plug installed in the internal combustion engine.

点火コイル本体１０１は、鉄心１１３を中心に挿入したボビン等に巻回された１次側コイル１１１、１次側コイル１１１の外周側に設置された２次側コイル１１２によって構成されている。
また、点火コイル本体１０１は、１次側コイル１１１が例えばケース１０２の側面に形成されたコネクタ部等を介して外部と配線接続されるように構成されている。
２次側コイル１１２の一端は、内燃機関の接地電位の部分に電気接続されており、２次側コイル１１２の他端は、プロテクタ１０３の上部に内蔵設置されている雑防抵抗１０４の一端に、高圧端子１０６を介して接続されている。高圧端子１０６は、例えば円筒蓋状に形成された電導部材であり、ケース１０２とプロテクタ１０３の接合部分において、当該ケース１０２の下端部分に固定され、ケース１０２内部に充填された注型絶縁樹脂１１０を封止している。 Ignition coil body 101 is constituted by the secondary coil 11 2 installed on the outer peripheral side of the wound bobbin inserted around the core 113 primary coil 111, primary coil 111.
Further, the ignition coil main body 101 is configured such that the primary coil 111 is wired and connected to the outside via, for example, a connector portion formed on the side surface of the case 102.
One end of the secondary coil 112 is electrically connected to the ground potential portion of the internal combustion engine, and the other end of the secondary coil 112 is connected to one end of the miscellaneous resistance 104 built in the upper part of the protector 103. , Is connected via the high voltage terminal 106. The high-voltage terminal 106 is, for example, a conductive member formed in the shape of a cylindrical lid. At the joint portion between the case 102 and the protector 103, the cast insulating resin 110 fixed to the lower end portion of the case 102 and filled inside the case 102. Is sealed.

雑防抵抗１０４は、プロテクタ１０３の延設方向に沿って設置固定されており、当該雑防抵抗１０４の電気接続を行うキャップ部１０５を、プロテクタ１０３内部において上下方向の両端に備えている。
雑防抵抗１０４のキャップ部１０５は、電気導体の金属製であり、プロテクタ１０３内部において上端側となるキャップ部１０５は、前述のケース１０２下端部分に固定されている高圧端子１０６と接触している。この高圧端子１０６は、例えばキャップ部１０５を覆うように形成されており、前述の２次側コイル１１２の他端が接続されている。
高圧タワー１００を組み立てる際には、ケース１０２の下端に設置されている高圧端子１０６に、上記の雑防抵抗１０４上端となるキャップ部１０５を挿入接続し、ケース１０２とプロテクタ１０３とを接続固定することにより、雑防抵抗１０４等をプロテクタ１０３内部へ挿入（配置）する。 The miscellaneous protective resistor 104 is installed and fixed along the extending direction of the protector 103, and cap portions 105 for electrically connecting the miscellaneous protective resistor 104 are provided at both ends in the vertical direction inside the protector 103.
The cap portion 105 of the miscellaneous resistance resistance 104 is made of metal of an electric conductor, and the cap portion 105 on the upper end side inside the protector 103 is in contact with the high voltage terminal 106 fixed to the lower end portion of the case 102. .. The high-voltage terminal 106 is formed so as to cover, for example, the cap portion 105, and the other end of the above-mentioned secondary side coil 112 is connected to the high-voltage terminal 106.
When assembling the high-voltage tower 100, the cap portion 105, which is the upper end of the miscellaneous resistance resistance 104, is inserted and connected to the high-voltage terminal 106 installed at the lower end of the case 102, and the case 102 and the protector 103 are connected and fixed. As a result, the miscellaneous protection resistor 104 and the like are inserted (arranged) inside the protector 103.

プロテクタ１０３内部に配置されたとき下端側となるキャップ端子１０５は、プロテクタ１０３内部に設置されているスプリング１０７の上端と接触する。雑防抵抗１０４は、スプリング１０７のバネ性によって上方へ押し上げるように付勢され、前述の上端側のキャップ部１０５が高圧端子１０６の凹部内側壁面等に押し付けられる。
スプリング１０７の下端側には、図示を省略した導電性の接続部材等が備えられ、前述のように点火プラグの頭部電極と接続するように構成されている。 The cap terminal 105, which is on the lower end side when arranged inside the protector 103, comes into contact with the upper end of the spring 107 installed inside the protector 103. The miscellaneous resistance resistance 104 is urged to be pushed upward by the spring property of the spring 107, and the cap portion 105 on the upper end side is pressed against the inner wall surface of the recess of the high voltage terminal 106 or the like.
A conductive connecting member (not shown) or the like (not shown) is provided on the lower end side of the spring 107, and is configured to be connected to the head electrode of the spark plug as described above.

特開２０１４−２１１１１８号公報Japanese Unexamined Patent Publication No. 2014-2111118

従来の内燃機関用点火コイルは、前述のように雑防抵抗を設置固定しているので、雑防抵抗の端子部と高圧端子との接触状態が一様になるとは限らず、当該キャップ部１０５と高圧端子１０６との間に、接触している部位と不要な隙間の生じる部位が生じることがある。
このような部位に高電圧を印加すると、上記の接触している部位は電流が流れる度に発熱して時間の経過に伴って酸化が進み、この部分から腐食などが発生する。また、上記の隙間には漏電などが生じ易く、絶縁体で形成された部分にはコロナ放電が生じる場合があり、不要な放電や漏電などにより各構成部材を傷めて当該点火コイルの性能低下を早めてしまうという問題点があった。 Since the conventional ignition coil for an internal combustion engine has a miscellaneous resistance resistor installed and fixed as described above, the contact state between the terminal portion of the miscellaneous resistance resistor and the high voltage terminal is not always uniform, and the cap portion 105 There may be a portion in contact with the high-voltage terminal 106 and a portion where an unnecessary gap is generated.
When a high voltage is applied to such a portion, the contacted portion generates heat each time a current flows and is oxidized with the passage of time, and corrosion or the like occurs from this portion. In addition, electric leakage is likely to occur in the above gap, and corona discharge may occur in the portion formed of the insulator, and unnecessary discharge or electric leakage damages each component to deteriorate the performance of the ignition coil. There was a problem of accelerating.

本発明は上記のような問題点に鑑みなされたもので、雑防抵抗の位置決めを適正に行い、長期間にわたって正常な動作性能を維持することができる内燃機関用点火コイルを提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide an ignition coil for an internal combustion engine capable of properly positioning a miscellaneous resistance and maintaining normal operating performance for a long period of time. And.

本発明に係る内燃機関用点火コイルは、注型絶縁樹脂を充填して点火コイル本体を内部に埋設したケースと、前記ケースに接合し、前記点火コイル本体が発生した高電圧を点火プラグへ供給する導電部材を覆うプロテクタと、抵抗体の長手両端に各々電極を有し、前記点火コイル本体と前記点火プラグとの間に電気接続される雑防抵抗と、前記雑防抵抗の一の電極と接合する第１高圧端子と、前記雑防抵抗の他の電極と接合する第２高圧端子と、を備え、前記ケースは、前記プロテクタと接合するように前記点火コイル本体を内蔵した部位から突出し、該ケース内部に繋がる孔部が設けられた接合部を有し、前記第１高圧端子は、前記点火コイル本体の２次側コイルと電気接続し、前記雑防抵抗の位置決めを行うように前記接合部の孔部の奥側に固定され、前記接合部は、前記第１高圧端子、前記雑防抵抗、および、前記第２高圧端子の周囲に前記注型絶縁樹脂が充填され、該注型絶縁樹脂を前記孔部先端側に圧入された前記第２高圧端子によって封止するように形成され、前記プロテクタが覆う導電部材は、前記ケースに前記プロテクタを接合したとき前記第２高圧端子に電気接続することを特徴とする。 The ignition coil for an internal combustion engine according to the present invention has a case in which a casting insulating resin is filled and an ignition coil body is embedded inside, and a case is joined to the case to supply a high voltage generated by the ignition coil body to an ignition plug. A protector that covers the conductive member, a miscellaneous resistance that has electrodes at both ends of the longitudinal length of the resistor and is electrically connected between the ignition coil body and the ignition plug, and one electrode of the miscellaneous resistance. A first high-voltage terminal to be joined and a second high-voltage terminal to be joined to another electrode of the miscellaneous protection resistance are provided, and the case protrudes from a portion incorporating the ignition coil body so as to be joined to the protector. The first high-voltage terminal has a joint portion provided with a hole connected to the inside of the case, and the first high-voltage terminal is electrically connected to the secondary side coil of the ignition coil body, and the joint is formed so as to position the miscellaneous resistance. The joint is fixed to the inner side of the hole of the portion, and the joint is filled with the casting insulating resin around the first high-voltage terminal, the miscellaneous resistance, and the second high-voltage terminal, and the casting insulation is provided. The conductive member formed so as to seal the resin with the second high-voltage terminal pressed into the tip side of the hole and covered with the protector is electrically connected to the second high-voltage terminal when the protector is joined to the case. It is characterized by doing.

また、本発明に係る内燃機関用点火コイルは、注型絶縁樹脂を充填して点火コイル本体を内部に埋設したケースと、前記ケースに接合し、前記点火コイル本体が発生した高電圧を点火プラグへ供給する導電部材を覆うプロテクタと、抵抗体の長手両端に各々電極を有し、前記点火コイル本体と前記点火プラグとの間に電気接続される雑防抵抗と、前記雑防抵抗の一の電極と接合する第１高圧端子と、を備え、前記ケースは、前記プロテクタと接合するように前記点火コイル本体を内蔵した部位から突出し、該ケース内部に繋がる孔部が設けられた接合部を有し、前記第１高圧端子は、前記点火コイル本体の２次側コイルと電気接続し、前記雑防抵抗の位置決めを行うように前記接合部の孔部の奥側に固定され、前記接合部は、前記第１高圧端子、および、前記雑防抵抗の周囲に前記注型絶縁樹脂が充填され、該注型絶縁樹脂を前記孔部に圧入された前記雑防抵抗の他の電極によって該孔部の先端側を封止するように形成され、前記プロテクタが覆う導電部材は、前記ケースに前記プロテクタを接合したとき前記雑防抵抗の他の電極に電気接続することを特徴とする。 Further, the ignition coil for an internal combustion engine according to the present invention has a case in which a casting insulating resin is filled and an ignition coil body is embedded inside, and a case is joined to the case, and a high voltage generated by the ignition coil body is used as a spark plug. A protector that covers a conductive member to be supplied to a resistor, a miscellaneous resistance that has electrodes at both ends of the longitudinal length of the resistor and is electrically connected between the ignition coil body and the spark plug, and one of the miscellaneous resistances. The case is provided with a first high-voltage terminal for joining with an electrode, and the case has a joint portion that protrudes from a portion incorporating the ignition coil main body so as to be joined with the protector and is provided with a hole portion connected to the inside of the case. The first high-voltage terminal is electrically connected to the secondary side coil of the spark plug body, and is fixed to the inner side of the hole of the joint so as to position the miscellaneous resistance, and the joint is fixed. The hole is filled with the casting insulating resin around the first high-voltage terminal and the miscellaneous resistance, and the casting insulating resin is press-fitted into the hole by another electrode of the miscellaneous resistance. The conductive member formed so as to seal the tip end side of the protector and covered with the protector is characterized in that when the protector is joined to the case, it is electrically connected to another electrode of the miscellaneous protection resistance.

また、前記第１高圧端子は、該第１高圧端子に接合した前記雑防抵抗の一の電極に向かって山型に突出する複数の突起を放射状に備え、前記複数の突起は、適度な押圧を生じさせて前記雑防抵抗の一の電極と接触するように形成されていることを特徴とする。 Further, the first high-voltage terminal is provided with a plurality of protrusions radially protruding toward one electrode of the miscellaneous resistance resistor joined to the first high-voltage terminal, and the plurality of protrusions are appropriately pressed. Is formed so as to come into contact with one of the electrodes of the miscellaneous resistance resistor.

また、前記第２高圧端子は、該第２高圧端子に接合した前記雑防抵抗の他の電極に向かって山型に突出する複数の突起を放射状に備え、前記複数の突起は、適度な押圧を生じさせて前記雑防抵抗の他の電極と接触するように形成されていることを特徴とする。 Further, the second high-voltage terminal is provided with a plurality of protrusions radially protruding toward the other electrode of the miscellaneous resistance resistor joined to the second high-voltage terminal, and the plurality of protrusions are appropriately pressed. It is characterized in that it is formed so as to cause contact with other electrodes of the miscellaneous resistance.

また、前記ケースは、前記第１高圧端子の外周に当接して該第１高圧端子、前記雑防抵抗および前記第２高圧端子の位置決めを行う鍔部を有し、前記鍔部は、前記第１高圧端子、前記雑防抵抗および前記第２高圧端子を覆うように前記注型絶縁樹脂を充填させる、前記第１高圧端子の外周に沿って配置された複数の隙間を有することを特徴とする。 Further, the case has a collar portion that comes into contact with the outer periphery of the first high voltage terminal and positions the first high voltage terminal, the miscellaneous resistance, and the second high voltage terminal, and the collar portion is the first high voltage terminal. 1. It is characterized by having a plurality of gaps arranged along the outer periphery of the first high-voltage terminal, which is filled with the casting insulating resin so as to cover the high-voltage terminal, the miscellaneous resistance, and the second high-voltage terminal. ..

また、前記ケースは、前記第１高圧端子の外周に当接して該第１高圧端子および前記雑防抵抗の位置決めを行う鍔部を有し、前記鍔部は、前記第１高圧端子および前記雑防抵抗を覆うように前記注型絶縁樹脂を充填させる、前記第１高圧端子の外周に沿って配置された複数の隙間を有することを特徴とする。 Further, the case has a collar portion that comes into contact with the outer periphery of the first high-voltage terminal to position the first high-voltage terminal and the miscellaneous resistance, and the collar portion is the first high-voltage terminal and the miscellaneous. It is characterized by having a plurality of gaps arranged along the outer periphery of the first high-voltage terminal, which is filled with the casting insulating resin so as to cover the resistance resistance.

本発明によれば、雑防抵抗の電極等をバランス良く支持固定するとともに、高電圧の導電部分を長期間良好な状態に維持することができる。 According to the present invention, it is possible to support and fix a miscellaneous resistance electrode or the like in a well-balanced manner, and to maintain a high-voltage conductive portion in a good state for a long period of time.

本発明の実施例による内燃機関用点火コイルの構成を示す説明図である。It is explanatory drawing which shows the structure of the ignition coil for an internal combustion engine according to the Example of this invention. 図１のＡ−Ａ線における断面を示す説明図である。It is explanatory drawing which shows the cross section in line AA of FIG. 従来の内燃機関用点火コイルの構成を示す説明図である。It is explanatory drawing which shows the structure of the conventional ignition coil for an internal combustion engine.

以下、この発明の実施の一形態を説明する。
（実施例）
図１は、本発明の実施例による内燃機関用点火コイルの構成を示す説明図である。この図は、内燃機関のヘッドカバー等に固定されたとき、当該内燃機関に設置固定された点火プラグへ直接接続するように構成された内燃機関用点火コイルである高圧タワー１を例示したもので、当該高圧タワー１の内部構成を示す断面図である。なお、図１においては、高圧タワー１の下側ならびに点火プラグ等の図示を省略している。
高圧タワー１は、点火コイル本体１１を内蔵するケース１２と、当該ケース１２の下端に接合するプロテクタ１３を備え、前述のように当該高圧タワー１を内燃機関へ設置したとき点火プラグへ接続するように構成されている。
ケース１２およびプロテクタ１３は、点火コイル本体１１が発生する高電圧に対応する絶縁性を備え、また、耐油性や耐熱性などを備えた材料を用いて形成されている。 Hereinafter, embodiments of the present invention will be described.
(Example)
FIG. 1 is an explanatory diagram showing a configuration of an ignition coil for an internal combustion engine according to an embodiment of the present invention. This figure illustrates a high-pressure tower 1 which is an ignition coil for an internal combustion engine configured to be directly connected to an ignition plug installed and fixed to the internal combustion engine when it is fixed to a head cover or the like of the internal combustion engine. It is sectional drawing which shows the internal structure of the high pressure tower 1. In FIG. 1, the lower side of the high-pressure tower 1 and the spark plug and the like are not shown.
The high-pressure tower 1 includes a case 12 incorporating the ignition coil main body 11 and a protector 13 joined to the lower end of the case 12, and is connected to the spark plug when the high-pressure tower 1 is installed in the internal combustion engine as described above. It is configured in.
The case 12 and the protector 13 are formed of a material having an insulating property corresponding to a high voltage generated by the ignition coil main body 11 and also having oil resistance and heat resistance.

プロテクタ１３は、例えば円筒状に形成されており、円筒状の長手方向に延設された孔部に、点火コイル本体１１が発生した高電圧を点火プラグへ導電させるスプリング１７等の導電部材等を備え、これらの導電部材等が点火プラグ以外の内燃機関の各部位に直接接触しないように覆っている。
ケース１２は、点火コイル本体１１を内包する形状をしており、下端部分には、前述のプロテクタ１３の孔部へ挿入されるように突出し、当該プロテクタ１３と接合して固定する形状に形成された接合部３０を有している。 The protector 13 is formed in a cylindrical shape, for example, and a conductive member such as a spring 17 for conducting a high voltage generated by the ignition coil main body 11 to a spark plug is formed in a hole extending in the longitudinal direction of the cylindrical shape. These conductive members and the like cover each part of the internal combustion engine other than the spark plug so as not to come into direct contact with each other.
The case 12 has a shape that includes the ignition coil main body 11, and is formed at the lower end portion so that it protrudes so as to be inserted into the hole of the protector 13 and is joined to and fixed to the protector 13. It has a joint portion 30.

接合部３０は、当該接合部３０の先端部分からケース１２の内部へ繋がる孔部が設けられている。この孔部の奥側には高圧端子１６ａが圧入、あるいは接合部３０の内部に設けられた固定部位等に固定され、また、孔部の先端側（接合部３０の先端側）には高圧端子１６ｂが圧入固定されている。
なお、高圧端子１６ａと高圧端子１６ｂとの間には、後述するように構成された雑防抵抗１４が配置され、当該雑防抵抗１４のキャップ部１５ａが高圧端子１６ａに接合し、キャップ部１５ｂが高圧端子１６ｂに接合する。
ここで、高圧端子１６ａ、雑防抵抗１４、高圧端子１６ｂは、例えば、キャップ部１５ａを高圧端子１６ａに接合し、また、キャップ部１５ｂを高圧端子１６ｂに接合した状態、即ち、これらを一体化した状態とし、後述する接合部３０の孔部に固定している。 The joint portion 30 is provided with a hole portion that connects the tip portion of the joint portion 30 to the inside of the case 12. A high-voltage terminal 16a is press-fitted into the back side of the hole or fixed to a fixing portion provided inside the joint 30, and a high-voltage terminal is placed on the tip side of the hole (tip side of the joint 30). 16b is press-fitted and fixed.
A miscellaneous resistance 14 configured as described later is arranged between the high-voltage terminal 16a and the high-voltage terminal 16b, and the cap portion 15a of the miscellaneous resistance resistance 14 is joined to the high-voltage terminal 16a to form a cap portion 15b. Joins the high voltage terminal 16b.
Here, the high-voltage terminal 16a, the miscellaneous resistance 14 and the high-voltage terminal 16b are, for example, in a state where the cap portion 15a is joined to the high-voltage terminal 16a and the cap portion 15b is joined to the high-voltage terminal 16b, that is, they are integrated. It is fixed in the hole of the joint portion 30 which will be described later.

点火コイル本体１１は、鉄心２３を例えば中心孔に挿通させたボビン等に１次側コイル２１が巻回されており、１次側コイル２１の外周側には、当該１次側コイル２１を覆うように形成されたボビン等に２次側コイル２２が巻回配置されている。
１次側コイル２１の巻線の両端部は、例えば、ケース１２の側方部分に設置されたコネクタ部等にそれぞれ配線接続され、高圧タワー１外部の電装機器等と配線接続するように構成されている。
２次側コイル２２の巻線の一端は、内燃機関の接地部分に配線接続されており、２次側コイル２２の巻線の他端は、ケース１２の下端部分に固定されている高圧端子１６ａに配線接続されている。 In the ignition coil main body 11, the primary side coil 21 is wound around a bobbin or the like through which an iron core 23 is inserted into, for example, a central hole, and the outer peripheral side of the primary side coil 21 covers the primary side coil 21. The secondary coil 22 is wound and arranged around the bobbin or the like formed as described above.
Both ends of the winding of the primary coil 21 are connected by wiring to, for example, a connector portion installed on the side portion of the case 12, and are configured to be wired and connected to electrical equipment and the like outside the high-voltage tower 1. ing.
One end of the winding of the secondary coil 22 is wired and connected to the grounding portion of the internal combustion engine, and the other end of the winding of the secondary coil 22 is a high-voltage terminal 16a fixed to the lower end of the case 12. Wiring connection to.

また、ケース１２は、点火コイル本体１１が発生する高電圧の漏電等を防ぐため、内部に注型絶縁樹脂１８を充填させている。
雑防抵抗１４は、点火コイル本体１１が高電圧を励起したときに生じるノイズを減衰させ、他の電子機器等の動作に障害が発生しないようにする抵抗値を有し、例えば円柱状に形成された抵抗体と、この抵抗体の長手方向各端部に設けられている、当該雑防抵抗１４の電極もしくは接続端子部となるキャップ部１５ａおよびキャップ部１５ｂによって構成されている。 Further, the case 12 is filled with a casting insulating resin 18 in order to prevent high voltage leakage or the like generated by the ignition coil main body 11.
The miscellaneous resistance resistance 14 has a resistance value that attenuates noise generated when the ignition coil main body 11 excites a high voltage so as not to interfere with the operation of other electronic devices or the like, and is formed in a columnar shape, for example. The resistor is composed of a cap portion 15a and a cap portion 15b which are provided at each end of the resistor in the longitudinal direction and serve as an electrode or a connection terminal portion of the miscellaneous resistance resistance 14.

図２は、図１のＡ−Ａ線における断面を示す説明図である。この図は、ケース１２とプロテクタ１３とを接合させたとき、これらの接合部分に備えられる各部の配置構成等を示している。
高圧端子１６ａは、導電部材の金属等を用いて例えば略王冠状に形成したもので、当該略王冠状の周壁部分に、複数の突起２６が形成されている。
突起２６は、周壁の内側に山型に突出する形状をしており、例えば、適当な強さのばね性を備えて、キャップ部１５ａに山型先端部分を当接させるように形成されている。
各突起２６は、上記の王冠状周壁に囲われた当該高圧端子１６ａの中心位置へ向かって突出しており、図２において放射状となるように高圧端子１６ａの周壁の複数個所に設置されている。 FIG. 2 is an explanatory view showing a cross section taken along the line AA of FIG. This figure shows the arrangement configuration and the like of each part provided in these jointed portions when the case 12 and the protector 13 are joined.
The high-voltage terminal 16a is formed, for example, in a substantially crown shape using a metal or the like of a conductive member, and a plurality of protrusions 26 are formed on the substantially crown-shaped peripheral wall portion.
The protrusion 26 has a shape that protrudes in a mountain shape inside the peripheral wall. For example, the protrusion 26 has a spring property of an appropriate strength and is formed so as to bring the tip portion of the mountain shape into contact with the cap portion 15a. ..
Each protrusion 26 projects toward the center position of the high-voltage terminal 16a surrounded by the crown-shaped peripheral wall, and is installed at a plurality of locations on the peripheral wall of the high-voltage terminal 16a so as to be radial in FIG.

換言すると、放射状に配置された各突起２６は、高圧端子１６ａに雑防抵抗１４のキャップ部１５ａが挿入されたとき、キャップ部１５ａの側面に向かって適度な押圧を生じるように形成されており、高圧端子１６ａに挿入されたキャップ部１５ａの位置決めを行うように備えられている。
即ち、高圧端子１６ａは、先端部３０の内部において雑防抵抗１４の位置決めを行うように構成されており、また、雑防抵抗１４の長さバラツキに応じて（長さバラツキを吸収して）、当該雑防抵抗１４を接合部３０内部の所定位置に配置するように設けられている。 In other words, each of the protrusions 26 arranged radially is formed so as to generate an appropriate pressure toward the side surface of the cap portion 15a when the cap portion 15a of the miscellaneous resistance resistance 14 is inserted into the high-voltage terminal 16a. , The cap portion 15a inserted into the high-voltage terminal 16a is provided for positioning.
That is, the high-voltage terminal 16a is configured to position the miscellaneous resistance resistance 14 inside the tip portion 30, and also (absorbs the length variation) according to the length variation of the miscellaneous defense resistance 14. , The miscellaneous resistance resistance 14 is provided so as to be arranged at a predetermined position inside the joint portion 30.

具体的には、突起２６は高圧端子１６ａの王冠状周方向に沿って、例えば等間隔を空けて４か所に設けられている。
突起２６は、雑防抵抗１４の圧入力を低減するとともにキャップ部１５ａ等の位置決めを行うため、少なくとも３か所以上の位置に配置される。
なお、接合部３０の孔部先端側に圧入配置される高圧端子１６ｂについても、高圧端子１６ａと同様に複数の山型突起を設け、キャップ部１５ｂもしくは雑防抵抗１４の位置決めを行うことができるように構成してもよい。 Specifically, the protrusions 26 are provided at four locations along the crown-shaped circumferential direction of the high-voltage terminal 16a, for example, at equal intervals.
The protrusions 26 are arranged at at least three positions in order to reduce the pressure input of the miscellaneous resistance resistance 14 and to position the cap portion 15a and the like.
As for the high-voltage terminal 16b that is press-fitted and arranged on the tip side of the hole of the joint portion 30, a plurality of chevron projections can be provided as in the high-voltage terminal 16a, and the cap portion 15b or the miscellaneous resistance resistance 14 can be positioned. It may be configured as follows.

前述のように形成されている高圧端子１６ａは、ケース１２の下端部、具体的には、接合部３０の孔部奥側（接合部３０の基端側）に圧入、あるいは前述のように接合部３０の内部に設けられた固定部位等に固定されている。
ケース１２もしくは接合部３０内部に圧入固定された高圧端子１６ａの周囲には、点火コイル本体１１と同様に注型絶縁樹脂１８が充填されている。詳しくは、接合部３０の内部において、高圧端子１６ａを固定する部位（後述する鍔部１２ａ）の周囲に注型絶縁樹脂１８が充填されており、さらに、高圧端子１６ａに接合させた雑防抵抗１４の周囲、後述する高圧端子１６ｂの周囲に注型絶縁樹脂１８が充填されている。 The high-voltage terminal 16a formed as described above is press-fitted into the lower end of the case 12, specifically, the back side of the hole of the joint portion 30 (the base end side of the joint portion 30), or is joined as described above. It is fixed to a fixing portion or the like provided inside the portion 30.
A cast insulating resin 18 is filled around the high-voltage terminal 16a press-fitted and fixed inside the case 12 or the joint portion 30 in the same manner as the ignition coil main body 11. Specifically, inside the joint portion 30, a cast insulating resin 18 is filled around a portion (a flange portion 12a to be described later) for fixing the high-voltage terminal 16a, and further, a miscellaneous resistance resistance bonded to the high-voltage terminal 16a. The casting insulating resin 18 is filled around 14 and around the high-voltage terminal 16b described later.

ケース１２、もしくは接合部３０の内部に、高圧端子１６ａを圧入固定する部位として鍔部１２ａを設けている。
鍔部１２ａは、接合部３０の孔部内へ圧入（挿入）された高圧端子１６ａの周壁を挟持または把持するように、当該ケース１２に一体形成されている。具体的には、鍔部１２ａは、ケース１２（接合部３０の孔部）に挿入された高圧端子１６ａの周壁（外周）を囲うように配置され、高圧端子１６ａを当該鍔部１２ａで囲われた中央部位へ固定するように構成されている。
換言すると、鍔部１２ａは、高圧端子１６ａの周壁外側に当接し、高圧端子１６ａ（ならびに雑防抵抗１４、高圧端子１６ｂ等）の位置決めを行って支持固定するように形成されている。 A collar portion 12a is provided inside the case 12 or the joint portion 30 as a portion for press-fitting and fixing the high-voltage terminal 16a.
The flange portion 12a is integrally formed with the case 12 so as to sandwich or grip the peripheral wall of the high-voltage terminal 16a press-fitted (inserted) into the hole portion of the joint portion 30. Specifically, the flange portion 12a is arranged so as to surround the peripheral wall (outer circumference) of the high-voltage terminal 16a inserted into the case 12 (the hole portion of the joint portion 30), and the high-voltage terminal 16a is surrounded by the collar portion 12a. It is configured to be fixed to the central part.
In other words, the flange portion 12a is formed so as to abut on the outer side of the peripheral wall of the high-voltage terminal 16a, position the high-voltage terminal 16a (as well as the miscellaneous resistance resistance 14, the high-voltage terminal 16b, etc.), and support and fix it.

鍔部１２ａは、図２に示したように、ケース１２（接合部３０）に固定された高圧端子１６ａの周壁に沿った各位置に、各々隙間を空けて設けられている。
換言すると、鍔部１２ａは、上記の複数の隙間を、当該鍔部１２ａの周方向において等間隔で備えている。即ち、鍔部１２ａは、接合部３０の延設方向に直交する断面において放射状に配置された隙間を有している。
ケース１２内部に充填された注型絶縁樹脂１８は、上記の隙間に侵入し、高圧端子１６ａならびに鍔部１２ａの周囲を覆い、さらに、高圧端子１６ａに接合された雑防抵抗１４、当該雑防抵抗１４と接合して接合部３０の孔部先端側に圧入された高圧端子１６ｂを覆う。即ち、鍔部１２ａは、注型絶縁樹脂１８を充填させるための隙間を複数備えている。
ケース１２（接合部３０）の内部に充填された注型絶縁樹脂１８は、接合部３０の孔部先端側に圧入された高圧端子１６ｂによって封止（シール）される。 As shown in FIG. 2, the flange portion 12a is provided at each position along the peripheral wall of the high-voltage terminal 16a fixed to the case 12 (joint portion 30) with a gap.
In other words, the collar portion 12a is provided with the above-mentioned plurality of gaps at equal intervals in the circumferential direction of the collar portion 12a. That is, the flange portion 12a has gaps arranged radially in a cross section orthogonal to the extending direction of the joint portion 30.
The cast insulating resin 18 filled in the case 12 penetrates into the above-mentioned gap, covers the periphery of the high-voltage terminal 16a and the collar portion 12a, and further, the miscellaneous resistance 14 bonded to the high-voltage terminal 16a and the miscellaneous protection. It is joined to the resistor 14 to cover the high-voltage terminal 16b press-fitted into the hole tip side of the joint portion 30. That is, the flange portion 12a is provided with a plurality of gaps for filling the casting insulating resin 18.
The cast insulating resin 18 filled inside the case 12 (joint portion 30) is sealed by a high-voltage terminal 16b press-fitted into the tip end side of the hole portion of the joint portion 30.

雑防抵抗１４のキャップ部１５ｂに接合する高圧端子１６ｂは、高圧端子１６ａと同様、あるいは概ね同様な外形に形成されており、接合部３０の先端側に圧入固定された状態において、王冠状の底面部等をスプリング１７の端部に当接させて当該スプリング１７と通電可能となるように設置されている。
即ち、高圧端子１６ｂは、ケース１２とプロテクタ１３とを接合させたとき、スプリング１７の先端部位と接触し、点火コイル本体１１、雑防抵抗１４等が、スプリング１７を介して点火プラグへ電気接続されるように設置されている。 The high-voltage terminal 16b to be joined to the cap portion 15b of the miscellaneous resistance resistance 14 is formed to have the same or substantially the same outer shape as the high-voltage terminal 16a, and is crown-shaped in a state of being press-fitted and fixed to the tip side of the joint portion 30. It is installed so that the bottom surface or the like is brought into contact with the end of the spring 17 so that the spring 17 can be energized.
That is, when the case 12 and the protector 13 are joined, the high-voltage terminal 16b comes into contact with the tip portion of the spring 17, and the ignition coil body 11, the miscellaneous resistance resistance 14, and the like are electrically connected to the spark plug via the spring 17. It is installed so that it can be done.

なお、高圧タワー１は、高圧端子１６ｂを備えることなく構成してもよい。
即ち、この構成では、ケース１２とプロテクタ１３とを接合させたとき、雑防抵抗１４のキャップ部１５ｂにスプリング１７の端部が直接接触し、点火コイル本体１１、雑防抵抗１４等が、スプリング１７を介して点火プラグへ電気接続される。
また、接合部３０は、雑防抵抗１４のキャップ部１５ｂ、もしくはその近傍の部位によって、当該接合部３０の孔部が封止されるように形成されている。即ち、接合部３０の孔部へ雑防抵抗１４を挿入するときに、当該雑防抵抗のキャップ部１５ｂ、もしくはその近傍の部位が、当該孔部の先端側に圧入される。
換言すると、高圧端子１６ｂを備えない構成においては、接合部３０は、雑防抵抗１４のキャップ部１５ｂ等を圧入固定するように形成され、ケース１２もしくは接合部３０の内部に充填された注型絶縁樹脂１８を、雑防抵抗１４のキャップ部１５ｂ等の部位によって封止するように構成されている。 The high-voltage tower 1 may be configured without the high-voltage terminal 16b.
That is, in this configuration, when the case 12 and the protector 13 are joined, the end of the spring 17 comes into direct contact with the cap portion 15b of the miscellaneous resistance resistance 14, and the ignition coil main body 11, the miscellaneous protection resistance 14 and the like spring. It is electrically connected to the spark plug via 17.
Further, the joint portion 30 is formed so that the hole portion of the joint portion 30 is sealed by the cap portion 15b of the miscellaneous resistance resistance 14 or a portion in the vicinity thereof. That is, when the miscellaneous resistance resistance 14 is inserted into the hole portion of the joint portion 30, the cap portion 15b of the miscellaneous defense resistance or a portion in the vicinity thereof is press-fitted into the tip end side of the hole portion.
In other words, in the configuration not provided with the high-voltage terminal 16b, the joint portion 30 is formed so as to press-fit and fix the cap portion 15b or the like of the miscellaneous resistance resistance 14, and is filled inside the case 12 or the joint portion 30. The insulating resin 18 is configured to be sealed by a portion such as a cap portion 15b of the miscellaneous resistance resistance 14.

以上のように、接合部３０の孔部先端側に圧入した高圧端子１６ｂ（雑防抵抗１４のキャップ部１５ｂ等）によって、ケース１２内部に充填した注型絶縁樹脂１８を封止したので、部品点数を抑制するとともに、ケース１２に接合するプロテクタ１３内部の各導電部材の電気接続（接触）部分に注型絶縁部材１８が付着することを防ぐことができる。
また、高圧端子１６ａ、高圧端子１６ｂに複数の山型突起を設けることにより、各高圧端子もしくは雑防抵抗１４の位置決めを行い、雑防抵抗１４を各高圧端子へ挿入する際の圧入力を低減するとともに、当該雑防抵抗１４の抜け強度を十分に確保することが可能になる。また、雑防抵抗１４と各高圧端子との電気接続の信頼性を高めることができる。
また、高圧端子１６ａの外周に当接する鍔部１２ａに複数の隙間を設けたので、ケース１２に圧入された高圧端子１６ａの周囲など、ケース１２内部の隅々に注型絶縁樹脂１８を充填することができ、各部の漏電等を防ぐとともに各構成部材等の損傷や腐食を抑制し、長期間にわたって正常な動作性能を維持することができる。 As described above, the cast insulating resin 18 filled inside the case 12 is sealed by the high-voltage terminal 16b (cap portion 15b of the miscellaneous resistance 14 or the like) press-fitted into the hole tip side of the joint portion 30, so that the component It is possible to suppress the number of points and prevent the casting insulating member 18 from adhering to the electrically connected (contacting) portion of each conductive member inside the protector 13 to be joined to the case 12.
Further, by providing a plurality of chevron projections on the high-voltage terminal 16a and the high-voltage terminal 16b, each high-voltage terminal or the miscellaneous resistance resistance 14 is positioned, and the pressure input when the miscellaneous defense resistance 14 is inserted into each high-voltage terminal is reduced. At the same time, it becomes possible to sufficiently secure the pull-out strength of the miscellaneous resistance resistance 14. In addition, the reliability of the electrical connection between the miscellaneous resistance resistor 14 and each high-voltage terminal can be improved.
Further, since a plurality of gaps are provided in the flange portion 12a that abuts on the outer circumference of the high-voltage terminal 16a, the casting insulating resin 18 is filled in every corner inside the case 12, such as around the high-voltage terminal 16a press-fitted into the case 12. It is possible to prevent electric leakage and the like of each part, suppress damage and corrosion of each component and the like, and maintain normal operating performance for a long period of time.

１，１００ 高圧タワー
１１，１０１ 点火コイル本体
１２，１０２ ケース
１２ａ 鍔部
１３，１０３ プロテクタ
１４，１０４ 雑防抵抗
１５ａ，１５ｂ，１０５ キャップ部
１６ａ，１６ｂ，１０６ 高圧端子
１７，１０７ スプリング
１８，１１０ 注型絶縁樹脂
２１，１１１ １次側コイル
２２，１１２ ２次側コイル
２３，１１３ 鉄心
３０ 接合部 1,100 High-voltage tower 11,101 Ignition coil body 12,102 Case 12a Collar 13,103 Protector 14,104 Miscellaneous resistance 15a, 15b, 105 Cap 16a, 16b, 106 High-voltage terminal 17,107 Spring 18,110 Note Type Insulation resin 21,111 Primary side coil 22,112 Secondary side coil 23,113 Iron core 30 Joint

Claims (4)

注型絶縁樹脂を充填して点火コイル本体を内部に埋設したケースと、
前記ケースに接合し、前記点火コイル本体が発生した高電圧を点火プラグへ供給する導電部材を覆うプロテクタと、
抵抗体の長手両端に各々電極を有し、前記点火コイル本体と前記点火プラグとの間に電気接続される雑防抵抗と、
前記雑防抵抗の一の電極と接合する第１高圧端子と、
前記雑防抵抗の他の電極と接合する第２高圧端子と、
を備え、
前記第１高圧端子は、
前記点火コイル本体の２次側コイルと電気接続され、
前記ケースは、
前記プロテクタと接合するように前記点火コイル本体を内蔵した部位から突出して該ケース内部に繋がる孔部が設けられた接合部と、
前記孔部の奥側に配置された前記第１高圧端子の外周に当接して該第１高圧端子、前記雑防抵抗および前記第２高圧端子の位置決めを行う鍔部と、を有し、
前記接合部は、
前記第１高圧端子、前記雑防抵抗、および、前記第２高圧端子の周囲に前記注型絶縁樹脂が充填され、前記孔部先端側を前記第２高圧端子によって封止するように形成され、
前記鍔部は、
前記第１高圧端子、前記雑防抵抗および前記第２高圧端子を覆うように前記注型絶縁樹脂を充填させる、前記第１高圧端子の外周に沿って配置された複数の隙間を有し、
前記導電部材は、
前記ケースに前記プロテクタを接合したとき前記第２高圧端子に電気接続する、
ことを特徴とする内燃機関用点火コイル。 A case filled with casting insulating resin and the ignition coil body embedded inside,
A protector that is joined to the case and covers a conductive member that supplies the high voltage generated by the ignition coil body to the spark plug.
A miscellaneous resistor that has electrodes on both ends of the longitudinal length of the resistor and is electrically connected between the ignition coil body and the spark plug.
A first high-voltage terminal to be joined to one electrode of the miscellaneous resistance resistor,
A second high-voltage terminal to be joined to the other electrode of the miscellaneous resistance resistor,
With
The first high voltage terminal is
It is electrically connected to the secondary coil of the ignition coil body.
The case is
A joint hole is provided leading to an interior the casing protrudes from a part which incorporates the ignition coil body to interface with the protector,
It has a first high-voltage terminal, a miscellaneous resistance resistor, and a flange portion for positioning the second high-voltage terminal, which abuts on the outer periphery of the first high-voltage terminal arranged on the back side of the hole .
The joint
The first high-voltage terminal, the noise absorbing resistor, and wherein the cast insulation resin around the second high-voltage terminal is filled, is formed the hole tip side so as to seal by the second high-voltage terminal,
The collar is
It has a plurality of gaps arranged along the outer periphery of the first high-voltage terminal, which is filled with the casting insulating resin so as to cover the first high-voltage terminal, the miscellaneous resistance, and the second high-voltage terminal.
The conductive member is
When the protector is joined to the case, it is electrically connected to the second high voltage terminal.
An ignition coil for an internal combustion engine. 注型絶縁樹脂を充填して点火コイル本体を内部に埋設したケースと、
前記ケースに接合し、前記点火コイル本体が発生した高電圧を点火プラグへ供給する導電部材を覆うプロテクタと、
抵抗体の長手両端に各々電極を有し、前記点火コイル本体と前記点火プラグとの間に電気接続される雑防抵抗と、
前記雑防抵抗の一の電極と接合する第１高圧端子と、
を備え、
前記第１高圧端子は、
前記点火コイル本体の２次側コイルと電気接続され、
前記ケースは、
前記プロテクタと接合するように前記点火コイル本体を内蔵した部位から突出して該ケース内部に繋がる孔部が設けられた接合部と、
前記孔部の奥側に配置された前記第１高圧端子の外周に当接して該第１高圧端子および前記雑防抵抗の位置決めを行う鍔部と、を有し、
前記接合部は、
前記第１高圧端子、および、前記雑防抵抗の周囲に前記注型絶縁樹脂が充填され、前記孔部先端側を前記雑防抵抗の他の電極によって封止するように形成され、
前記鍔部は、
前記第１高圧端子および前記雑防抵抗を覆うように前記注型絶縁樹脂を充填させる、前記第１高圧端子の外周に沿って配置された複数の隙間を有し、
前記導電部材は、
前記ケースに前記プロテクタを接合したとき前記雑防抵抗の他の電極に電気接続する、
ことを特徴とする内燃機関用点火コイル。 A case filled with casting insulating resin and the ignition coil body embedded inside,
A protector that is joined to the case and covers a conductive member that supplies the high voltage generated by the ignition coil body to the spark plug.
A miscellaneous resistor that has electrodes on both ends of the longitudinal length of the resistor and is electrically connected between the ignition coil body and the spark plug.
A first high-voltage terminal to be joined to one electrode of the miscellaneous resistance resistor,
With
The first high voltage terminal is
It is electrically connected to the secondary coil of the ignition coil body.
The case is
A joint hole is provided leading to an interior the casing protrudes from a part which incorporates the ignition coil body to interface with the protector,
It has a flange portion that abuts on the outer periphery of the first high-voltage terminal arranged on the back side of the hole portion and positions the first high-voltage terminal and the miscellaneous resistance.
The joint
Said first high voltage terminal, and the noise suppression is the cast insulation resin is filled around the resistor, it is formed the hole portion distal end side so as to seal by the other electrode of the noise absorbing resistor,
The collar is
It has a plurality of gaps arranged along the outer circumference of the first high-voltage terminal, which is filled with the casting insulating resin so as to cover the first high-voltage terminal and the miscellaneous resistance.
The conductive member is
When the protector is joined to the case, it is electrically connected to another electrode of the miscellaneous resistance resistor.
An ignition coil for an internal combustion engine. 前記第１高圧端子は、
該第１高圧端子に接合した前記雑防抵抗の一の電極に向かって山型に突出する複数の突起を放射状に備え、
前記複数の突起は、
各々適度な押圧を生じさせて前記雑防抵抗の一の電極と接触するように形成されている、
ことを特徴とする請求項１または２に記載の内燃機関用点火コイル。 The first high voltage terminal is
A plurality of protrusions protruding in a mountain shape toward one electrode of the miscellaneous resistance resistor joined to the first high-voltage terminal are provided radially.
The plurality of protrusions
Each of them is formed so as to generate an appropriate pressure and come into contact with one of the electrodes of the miscellaneous resistance resistor.
The ignition coil for an internal combustion engine according to claim 1 or 2. 前記第２高圧端子は、
該第２高圧端子に接合した前記雑防抵抗の他の電極に向かって山型に突出する複数の突起を放射状に備え、
前記複数の突起は、
各々適度な押圧を生じさせて前記雑防抵抗の他の電極と接触するように形成されている、
ことを特徴とする請求項１に記載の内燃機関用点火コイル。 The second high voltage terminal is
A plurality of protrusions radially protruding toward the other electrode of the miscellaneous resistance resistor joined to the second high-voltage terminal are provided radially.
The plurality of protrusions
Each is formed so as to generate an appropriate pressure and come into contact with the other electrodes of the miscellaneous resistance.
The ignition coil for an internal combustion engine according to claim 1.
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