JP4683424B2 - Ignition coil for internal combustion engine - Google Patents

Ignition coil for internal combustion engine Download PDF

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JP4683424B2
JP4683424B2 JP2006016107A JP2006016107A JP4683424B2 JP 4683424 B2 JP4683424 B2 JP 4683424B2 JP 2006016107 A JP2006016107 A JP 2006016107A JP 2006016107 A JP2006016107 A JP 2006016107A JP 4683424 B2 JP4683424 B2 JP 4683424B2
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internal combustion
ignition coil
engine
combustion engine
flange portion
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JP2007198193A (en
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泰功 山口
博巳 井出
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阪神エレクトリック株式会社
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本発明は、例えば自動車等のエンジンの点火プラグに火花放電を発生させるための内燃機関用点火コイルに関し、特にその接地端子の構造に関するものである。   The present invention relates to an ignition coil for an internal combustion engine for generating a spark discharge in an ignition plug of an engine such as an automobile, and more particularly to the structure of a ground terminal thereof.

従来のモールド型内燃機関用点火コイルにおいて、例えば、図３、４に示すようにエンジンと接地するための接地端子１は絶縁ケース２のフランジ部３に形成されたボルト孔４内に設置されたブッシュ５の上に配置されている。このような構成の内燃機関用点火コイルを取り付けボルト６を使用してフランジ部３でエンジン７に固定すると、接地端子１と取り付けボルト６が接触し、電気的に点火コイルがエンジン７に接地される。   In a conventional ignition coil for a molded internal combustion engine, for example, as shown in FIGS. 3 and 4, a ground terminal 1 for grounding with an engine is installed in a bolt hole 4 formed in a flange portion 3 of an insulating case 2. It is arranged on the bush 5. When the ignition coil for an internal combustion engine having such a configuration is fixed to the engine 7 with the flange portion 3 using the mounting bolt 6, the ground terminal 1 and the mounting bolt 6 come into contact with each other, and the ignition coil is electrically grounded to the engine 7. The

しかし、このような従来の内燃機関用点火コイルにおける接地端子の構造では、取り付けボルト６を締め付ける過程で、取り付けボルト６の頭部６ａと接地端子１が直接接触し、摩擦で接地端子１が変形、破損する場合が存在した。
また、エンジンを稼働した際に発生する振動は、図５（ｂ）に示すように取り付けボルト６の頭部で固定された接地端子１を不自然な形で変形させ、疲労破断を起こす虞れがあった。これに対して図５（ａ）は、自由に変形させた例である。
これらの欠点を解消するためには、端子を大型化したり、強度のある材料を選択して接地端子１の強度を増す必要があった。
しかし、端子を大型化する方法では、内燃機関用点火コイルのフランジ部が大型化し、エンジンに搭載する際の制約が増して不利であった。また、材料の強度を増す方法では、接地端子の単価が大きくなり、コスト面から不利であった。 However, in such a structure of the ground terminal in the conventional ignition coil for an internal combustion engine, in the process of tightening the mounting bolt 6, the head 6a of the mounting bolt 6 and the ground terminal 1 are in direct contact, and the ground terminal 1 is deformed by friction. There was a case to be damaged.
Further, the vibration generated when the engine is operated may cause the fatigue terminal to be deformed unnaturally by deforming the ground terminal 1 fixed by the head of the mounting bolt 6 as shown in FIG. 5B. was there. On the other hand, FIG. 5A shows an example in which the sheet is freely deformed.
In order to eliminate these disadvantages, it is necessary to increase the strength of the ground terminal 1 by increasing the size of the terminal or selecting a strong material.
However, the method of increasing the size of the terminal is disadvantageous because the flange portion of the ignition coil for the internal combustion engine is increased in size, and restrictions are imposed when it is mounted on the engine. In addition, the method of increasing the strength of the material is disadvantageous from the viewpoint of cost because the unit price of the ground terminal is increased.

この発明は、上記に鑑み提案されたもので接地端子と取り付けボルトを直接接触させることなく、ブッシュを介して接続して、接地端子の変形、破損を防止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ものである。   The present invention has been proposed in view of the above, and provides an ignition coil for an internal combustion engine that can be connected via a bush without directly contacting a ground terminal and a mounting bolt to prevent deformation and breakage of the ground terminal. It is intended.

上記目的を達成する為に、本発明の内燃機関用点火コイルは一次コイル及び二次コイルと、その二つのコイルを磁気的に結合させる鉄心と、これらを収納する絶縁ケースとを備え、前記絶縁ケースのフランジ部を取り付けボルトでエンジンに固定することにより当該ボルト或いはブッシュを介してエンジンと接地する接地端子をフランジ部に有するものであって、前記接地端子を前記フランジ部に内蔵するととともに、フランジ部に形成したボルト孔近傍に設置した２つのブッシュで上下から挟むことにより、取り付けボルトと接地端子が直接接触することなく、接地端子とエンジンとの電気的導通を得ることを特徴とする内燃機関用点火コイル。 In order to achieve the above object, an ignition coil for an internal combustion engine according to the present invention comprises a primary coil and a secondary coil, an iron core that magnetically couples the two coils, and an insulating case that accommodates them. The flange portion of the case has a ground terminal in the flange portion that is grounded to the engine via the bolt or bush by fixing the flange portion of the case to the engine with the bolt. An internal combustion engine characterized in that the electrical connection between the grounding terminal and the engine can be obtained without direct contact between the mounting bolt and the grounding terminal by being sandwiched from above and below by two bushes installed in the vicinity of the bolt hole formed in the part Ignition coil.

この発明は上記した構成からなるので、以下に説明するような効果を奏することができる。   Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

本発明では、一次コイル及び二次コイルと、その二つのコイルを磁気的に結合させる鉄心と、これらを収納する絶縁ケースとを備え、前記絶縁ケースのフランジ部を取り付けボルトでエンジンに固定することにより当該ボルト或いはブッシュを介してエンジンと接地する接地端子をフランジ部に有する内燃機関用点火コイルであって、前記接地端子を前記フランジ部に内蔵するととともに、フランジ部に形成したボルト孔近傍に設置した２つのブッシュで上下から挟むことにより、取り付けボルトと接地端子が直接接触することなく、接地端子とエンジンとの電気的導通を得るので取り付けボルトを締め付ける工程で接地端子を変形させたり、破損させる虞れがない。また、エンジンの振動による疲労破断を生じる虞れもない。 In the present invention, a primary coil and a secondary coil, an iron core that magnetically couples the two coils, and an insulating case that accommodates the two coils are provided, and the flange portion of the insulating case is fixed to the engine with a mounting bolt. An ignition coil for an internal combustion engine having a grounding terminal grounded to the engine via the bolt or bush by the internal combustion engine, the grounding terminal being built in the flange part, and installed in the vicinity of the bolt hole formed in the flange part By sandwiching from above and below with the two bushes, the grounding terminal is deformed or damaged in the process of tightening the mounting bolt to obtain electrical continuity between the grounding terminal and the engine without direct contact between the mounting bolt and the grounding terminal. There is no fear. Further, there is no risk of fatigue fracture due to engine vibration.

接地端子をフランジ部に内蔵し、フランジ部に形成したボルト孔近傍に設置したブッシュを介して接地端子とエンジンとを導通させるので、接地端子と取り付けボルトが直接接触することがなく、接地端子の変形や破断を防止するという目的が達成できる。   The grounding terminal is built in the flange part, and the grounding terminal and the engine are connected to each other through a bush installed in the vicinity of the bolt hole formed in the flange part. The purpose of preventing deformation and breakage can be achieved.

以下、一実施の形態を示す図面に基づいて本発明を詳細に説明する。図１は本発明に係る内燃機関用点火コイルの縦断面図、図２は本発明の内燃機関用点火コイルのフランジ部を示す要部断面図である。ここで、内燃機関用点火コイル１０は、一次コイル１１及び二次コイル１２と、その二つのコイルを磁気的に結合させる鉄心１３と、これらを収納する絶縁ケース１４とを備え、絶縁ケース１４のフランジ部１５を取り付けボルト１６でエンジン１７に固定することにより当該ボルト或いはブッシュを介してエンジン１７と接地する接地端子１８をフランジ部に有するものであって、接地端子１８をフランジ部１５に内蔵するととともに、フランジ部１５に形成したボルト孔１９近傍に設置したブッシュ２０を介してエンジン１７と導通させる。   Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a longitudinal sectional view of an ignition coil for an internal combustion engine according to the present invention, and FIG. 2 is a principal sectional view showing a flange portion of the ignition coil for an internal combustion engine according to the present invention. Here, the internal combustion engine ignition coil 10 includes a primary coil 11 and a secondary coil 12, an iron core 13 that magnetically couples the two coils, and an insulating case 14 that houses them, and When the flange portion 15 is fixed to the engine 17 with the mounting bolt 16, the flange portion has a ground terminal 18 that is grounded to the engine 17 via the bolt or bush, and the ground terminal 18 is built in the flange portion 15. At the same time, it is electrically connected to the engine 17 via a bush 20 installed in the vicinity of the bolt hole 19 formed in the flange portion 15.

図２に示す実施例では、接地端子１８はフランジ部１５の厚さ方向のほぼ中央に設置されており、ボルト孔１９の位置で上下から挿入された導電性を有するブッシュ２０によって狭持されている。ブッシュ２０は、本実施例では、ボルト孔１９の内周に挿通されており、取り付けボルト１６を締め付けることにより、接地端子１８と電気的導通が生じる。また、２個のブッシュ２０と接地端子１８との厚さの総計は、フランジ部１５の厚さよりやや厚く構成されている。   In the embodiment shown in FIG. 2, the grounding terminal 18 is installed at substantially the center in the thickness direction of the flange portion 15, and is sandwiched by a conductive bush 20 inserted from above and below at the position of the bolt hole 19. Yes. In the present embodiment, the bush 20 is inserted into the inner periphery of the bolt hole 19, and electrical continuity with the ground terminal 18 occurs when the mounting bolt 16 is tightened. Further, the total thickness of the two bushes 20 and the ground terminal 18 is configured to be slightly thicker than the thickness of the flange portion 15.

このような構造の内燃機関用点火コイルは、エンジンに取り付けボルト１６で取り付ける際に、ボルト頭部との摩擦で接地端子１８が変形したり、破損する虞れがなく、安定したエンジンとの接地を確保することができる。また、エンジンの振動によって接地端子１８が疲労破断する虞れもない。   The ignition coil for an internal combustion engine having such a structure has a possibility that the grounding terminal 18 is not deformed or damaged due to friction with the bolt head when it is attached to the engine with the mounting bolt 16, and stable grounding with the engine is possible. Can be secured. Further, there is no possibility that the ground terminal 18 is fatigued due to engine vibration.

なお、ブッシュ２０は、ボルト孔１９の内周に挿通する場合について説明したが、これに限ることなくボルト孔近傍であれば、ボルト孔の周囲であってもよい。   In addition, although the bush 20 demonstrated the case where it penetrates to the inner periphery of the bolt hole 19, it may be the circumference | surroundings of a bolt hole as long as it is not restricted to this but a bolt hole vicinity.

図１は、本発明に係る内燃機関用点火コイルの縦断面図である。FIG. 1 is a longitudinal sectional view of an ignition coil for an internal combustion engine according to the present invention. 図２は、同内燃機関用点火コイルのフランジ部を示す要部断面図である。FIG. 2 is a cross-sectional view of a main part showing a flange portion of the ignition coil for the internal combustion engine. 図３は、従来の内燃機関用点火コイルを示す全体斜視図である。FIG. 3 is an overall perspective view showing a conventional ignition coil for an internal combustion engine. 図４は、従来の内燃機関用点火コイルのフランジ部を示す要部断面図である。FIG. 4 is a cross-sectional view of a main part showing a flange portion of a conventional ignition coil for an internal combustion engine. 図５（ａ）は、板を自由に曲げ変形させた状態を示す説明図、（ｂ）は板を幅ａ２で挟んだ状態曲げた場合を示す説明図である。FIG. 5A is an explanatory view showing a state where the plate is freely bent and deformed, and FIG. 5B is an explanatory view showing a case where the plate is bent with a width a2.

符号の説明Explanation of symbols

１０ 内燃機関用点火コイル
１１ 一次コイル
１２ 二次コイル
１３ 鉄心
１４ 絶縁ケース
１５ フランジ部
１６ 取り付けボルト
１７ エンジン
１８ 接地端子
１９ ボルト孔
２０ ブッシュ DESCRIPTION OF SYMBOLS 10 Ignition coil 11 for internal combustion engines Primary coil 12 Secondary coil 13 Iron core 14 Insulating case 15 Flange part 16 Mounting bolt 17 Engine 18 Grounding terminal 19 Bolt hole 20 Bush

Claims (1)

一次コイル及び二次コイルと、その二つのコイルを磁気的に結合させる鉄心と、これらを収納する絶縁ケースとを備え、前記絶縁ケースのフランジ部を取り付けボルトでエンジンに固定することにより当該ボルト或いはブッシュを介してエンジンと接地する接地端子をフランジ部に有する内燃機関用点火コイルであって、
前記接地端子を前記フランジ部に内蔵するととともに、フランジ部に形成したボルト孔近傍に設置した２つのブッシュで上下から挟むことにより、取り付けボルトと接地端子が直接接触することなく、接地端子とエンジンとの電気的導通を得ることを特徴とする内燃機関用点火コイル。 A primary coil and a secondary coil; an iron core that magnetically couples the two coils; and an insulating case that houses them; and fixing the flange portion of the insulating case to the engine with a mounting bolt, the bolt or An ignition coil for an internal combustion engine having a grounding terminal in a flange portion that is grounded to an engine via a bush,
The grounding terminal is built in the flange part, and sandwiched from above and below by two bushes installed in the vicinity of the bolt hole formed in the flange part, so that the mounting bolt and the grounding terminal are not in direct contact with each other. ignition coil, wherein the obtaining of the electrical conduction.
JP2006016107A 2006-01-25 2006-01-25 Ignition coil for internal combustion engine Expired - Fee Related JP4683424B2 (en)

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JP4683424B2 true JP4683424B2 (en) 2011-05-18

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007270759A (en) * 2006-03-31 2007-10-18 Diamond Electric Mfg Co Ltd Ignition coil device for internal combustion engine
JP5291978B2 (en) * 2008-04-23 2013-09-18 日立オートモティブシステムズ株式会社 Ignition coil for internal combustion engine
DE102010039410A1 (en) * 2010-08-17 2012-02-23 Robert Bosch Gmbh Ignition device with improved sealing properties
JP2013115296A (en) * 2011-11-30 2013-06-10 Diamond Electric Mfg Co Ltd Ignition coil for internal combustion engine
JP6468143B2 (en) 2015-09-16 2019-02-13 株式会社デンソー Ignition coil for internal combustion engines

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005050892A (en) * 2003-07-30 2005-02-24 Hitachi Ltd Ignition coil for internal combustion engine
JP2007027204A (en) * 2005-07-12 2007-02-01 Denso Corp Ignition coil and its manufacturing method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005050892A (en) * 2003-07-30 2005-02-24 Hitachi Ltd Ignition coil for internal combustion engine
JP2007027204A (en) * 2005-07-12 2007-02-01 Denso Corp Ignition coil and its manufacturing method

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