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JP5291978B2 - Ignition coil for internal combustion engine - Google Patents

Ignition coil for internal combustion engine Download PDF

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Publication number
JP5291978B2
JP5291978B2 JP2008111971A JP2008111971A JP5291978B2 JP 5291978 B2 JP5291978 B2 JP 5291978B2 JP 2008111971 A JP2008111971 A JP 2008111971A JP 2008111971 A JP2008111971 A JP 2008111971A JP 5291978 B2 JP5291978 B2 JP 5291978B2
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coil
ignition coil
internal combustion
combustion engine
coil case
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JP2009266906A (en
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康則 大高
貴信 小林
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce connection defects by suppressing corrosion of a connection terminal portion of an electric conductor and a conductive bush since a conventional ignition coil for internal combustion engine has a conductive metal bush and an electric conductor, connected to the conductive bush, electrically connected to each other on an upper surface of the conductive bush positioned outside a coil case and then an interface of the electric connection portion is in the atmosphere, so there is a risk of a connection defect due to corrosion of the connection terminal portion of the electric conductor and the conductive bush. <P>SOLUTION: The coil case is formed by molding the electric connection portion of the electric conductor, connecting the conductive bush coming into contact with an electric ground potential portion to a power supply ground terminal of a connector provided in the coil case, of resin in one body inside a resin molding forming the coil case. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、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。   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 the internal combustion engine.

この種点火コイルは、1次コイルと2次コイルが巻装された鉄心をコイルケース内へ収納し、コイルケース内の各部材間に電気的絶縁樹脂を注入して硬化させている。   In this type of ignition coil, an iron core around which a primary coil and a secondary coil are wound is housed in a coil case, and an electrically insulating resin is injected between each member in the coil case to be cured.

しかし、前記構造による鉄心はコイルケース内で電気的に浮いた状態となっており、コイル動作時に発生する放射ノイズに対するシールド効果は期待できない。   However, the iron core having the above structure is in an electrically floating state within the coil case, and a shielding effect against radiation noise generated during coil operation cannot be expected.

近年はエンジン周辺に取付けられる部品は電子制御が支流となっており、ノイズの発生源の一つとなっている点火コイルではノイズを低減させる必要がある。   In recent years, electronic control has been a branching component around the engine, and it is necessary to reduce noise in an ignition coil that is one of the sources of noise.

この点火コイルのノイズ低減対策とし、特開2005−50892号公報においては、鉄心をコイルケースに設けた導電性金属ブッシュを介してエンジンヘッドへ接続させるものが記載されている。   As a measure for reducing the noise of the ignition coil, Japanese Patent Application Laid-Open No. 2005-50892 describes that an iron core is connected to an engine head via a conductive metal bush provided in a coil case.

特開2005−50892号公報JP 2005-50892 A

しかしながら、上記従来技術では導電性金属ブッシュと当該導電性金属ブッシュに接続される電気導体とは、コイルケースの外側に位置する導電性ブッシュの上面で電気的に接続されている。   However, in the above prior art, the conductive metal bush and the electric conductor connected to the conductive metal bush are electrically connected on the upper surface of the conductive bush located outside the coil case.

このため電気的接続部の界面が大気中に存在することとなり、電気導体の接続端子部および導電性ブッシュは腐食し接続不良となる可能性がある。   For this reason, the interface of the electrical connection portion exists in the atmosphere, and the connection terminal portion of the electrical conductor and the conductive bush may corrode and cause poor connection.

また、コイル取付け用のボルトに電気導体の接続端子を挟み込む接続構造においては、ボルト締め付け時に接続端子部にも外力(回転力)が印加されるため電気導体の接続端子が初期位置からずれて、導通不良を生じることも考えられ、安定した電気的接続を図ることができ憎い構成となっている。   In addition, in the connection structure in which the connection terminal of the electric conductor is sandwiched between the bolts for attaching the coil, an external force (rotational force) is applied to the connection terminal portion when the bolt is tightened, so the connection terminal of the electric conductor is shifted from the initial position, It is conceivable that a conduction failure may occur, and a stable electrical connection can be achieved.

本発明の目的は電気導体の接続端子部および導電性ブッシュの腐食を抑制して接続不良を低減することを目的とする。   An object of the present invention is to reduce the connection failure by suppressing the corrosion of the connection terminal portion of the electric conductor and the conductive bush.

好適には、接続時に電気導体の接続端子が外力を受けにくくして、接続不良を起し難くすることにある。   Preferably, at the time of connection, the connection terminal of the electric conductor is less likely to receive an external force, and connection failure is less likely to occur.

上記目的を達成するために本発明では、コイルケースを電気的アース電位部に接触する導電性ブッシュとコイルケースに設けられたコネクタの電源アース端子とを接続する電気導体の電気的接続部を、コイルケースを形成する樹脂成形体の内部に一体に樹脂成形する。具体的には、コネクタに設けられた電源アース端子に一端が接続された電気導体の他端を、ボルトで電気的アース電位部に締め付けて固定される金属ブッシュの外周で前記金属ブッシュに電気的に接続するよう構成した。 In order to achieve the above object, in the present invention, the electrical connection portion of the electrical conductor for connecting the conductive bush that contacts the coil case to the electrical ground potential portion and the power supply ground terminal of the connector provided in the coil case, The resin is integrally molded inside the resin molded body forming the coil case. Specifically, the other end of the electric conductor having one end connected to the power supply ground terminal provided in the connector is electrically connected to the metal bush at the outer periphery of the metal bush that is fixed to the electric ground potential portion with a bolt. Configured to connect to.

このように構成された本発明によれば、電気導体の電気的接続部及び導電性ブッシュを腐食から保護でき、信頼性の高い電気的接続構造を可能とする。   According to the present invention configured as described above, the electrical connection portion of the electrical conductor and the conductive bush can be protected from corrosion, and a highly reliable electrical connection structure is possible.

本発明によればさらに、電気導体の電気的接続部に外力が作用しにくくなり、接続不良を低減できる。
Further, according to the present invention, it is difficult for an external force to act on the electrical connection portion of the electrical conductor, thereby reducing connection failure.

図1,図2を用い、本発明の一実施例を説明する。   An embodiment of the present invention will be described with reference to FIGS.

点火コイルは高電圧を発生させるため1次コイル1,2次コイル2,1次コイル1と2次コイル2とを磁気的に結合する鉄心3を有しており、前記鉄心3はサイド鉄心3aとセンター鉄心3bとに分かれ、前記センター鉄心3bには1次コイル1および2次コイル2が巻装され、サイド鉄心3aは1次コイル1および2次コイル2とを囲うように環状に配置される。コイルケース4は熱可塑性樹脂(例えばPBT)で形成し、1次コイル1,2次コイル2,鉄心3、からなるコイル組立体を収容させ、各部材の隙間に電気的絶縁を行うための絶縁樹脂5(例えばエポキシ樹脂)が充填されコイル部を形成している。コイルで発生させた高電圧はスプリング6を介し点火プラグ7へ通電させている。   The ignition coil has an iron core 3 for magnetically coupling the primary coil 1, the secondary coil 2, the primary coil 1 and the secondary coil 2 to generate a high voltage, and the iron core 3 is a side iron core 3a. The center iron core 3b is wound with the primary coil 1 and the secondary coil 2, and the side iron core 3a is annularly arranged so as to surround the primary coil 1 and the secondary coil 2. The The coil case 4 is made of a thermoplastic resin (for example, PBT), accommodates a coil assembly composed of a primary coil, a secondary coil 2, and an iron core 3, and is insulated to provide electrical insulation in the gaps between the members. Resin 5 (for example, epoxy resin) is filled to form a coil portion. The high voltage generated by the coil is energized to the spark plug 7 via the spring 6.

点火コイルの固定はコイルケース4の外周部に設けられる導電性ブッシュ8に締め付けボルト9が取付けられエンジンヘッド10に固定される。導電性ブッシュ8には導電性部材で形成させた接続端子A11がコイルケース内部で溶接(または導電性接着剤)され電気的に接続している。前記接続された導電性ブッシュ8と接続端子A11とはコイルケース成形時にコイルケースにインサートすることによりコイルケース樹脂内部での電気的接続を可能としている。また、前記接続端子A11の他端側はサイド鉄心3aと電気的に接続されることにより、鉄心3はアース状態となる。これにより、コイル動作時に発生する放射ノイズはアース状態となっているサイド鉄心3aがコイルを囲うように配置されることでシールド効果が働きノイズ低減が可能となる。また、前記鉄心3は、導電部材で形成させた接続端子B12により、コネクタのGND端子13とも電気的接続を図っており、コネクタハーネスからの伝導ノイズは、アースされている鉄心3,接続端子A11および導電性ブッショ8を介し、エンジンヘッド部へ落としノイズ低減を図っている。   The ignition coil is fixed to the engine head 10 by attaching a tightening bolt 9 to a conductive bush 8 provided on the outer periphery of the coil case 4. A connection terminal A11 formed of a conductive member is electrically connected to the conductive bush 8 by welding (or a conductive adhesive) inside the coil case. The connected conductive bush 8 and connection terminal A11 can be electrically connected inside the coil case resin by being inserted into the coil case when the coil case is molded. Further, the other end side of the connection terminal A11 is electrically connected to the side iron core 3a, so that the iron core 3 is grounded. As a result, the radiation noise generated during the coil operation is arranged so that the side iron core 3a in the ground state surrounds the coil, so that the shielding effect works and the noise can be reduced. The iron core 3 is also electrically connected to the GND terminal 13 of the connector by a connection terminal B12 formed of a conductive member, and the conduction noise from the connector harness is grounded iron core 3, the connection terminal A11. The noise is reduced to the engine head through the conductive bushing 8.

次に、図3〜図5を用い、接続端子Aと導電性ブッシュとの接続方法の別実施例を説明する。   Next, another embodiment of a method for connecting the connection terminal A and the conductive bush will be described with reference to FIGS.

図3においての接続構造は、板状に形成させた接続端子A11の端部に穴を設け、穴の内側には突起部11aを複数個形成させ、前記突起部11aに導電性ブッシュ外周が圧入されることにより電気的接続を図る方法である。導電性ブッシュ8には段付き部8aを形成させることにより圧入の時のストッパー機能をもたせるとともに、コイルケース樹脂部との接触面積を大きくすることにより、前記コイルケースとの保持強度を向上させている。これによりボルト9締め付け時に受ける回転力に対しても導電性ブッシュ8の共回りを防ぐことが可能となる。また、接続端子A11と導電性ブッシュ8との圧入時は、突起形状を導電性ブッシュ側に形成させた場合でもよい。例えば、導電性ブッシュ8はコイルケースとの保持力を大きくするため、導電性ブッシュ外径部には複数の溝が形成させる場合があり、この突起部(溝部)を利用し圧入させることも有効な手段となる。   In the connection structure in FIG. 3, a hole is formed at the end of the connection terminal A11 formed in a plate shape, a plurality of protrusions 11a are formed inside the hole, and the outer periphery of the conductive bush is press-fitted into the protrusion 11a. This is a method for achieving electrical connection. The conductive bush 8 is provided with a stopper function at the time of press-fitting by forming a stepped portion 8a, and by increasing the contact area with the coil case resin portion, the holding strength with the coil case is improved. Yes. This makes it possible to prevent the conductive bushing 8 from co-rotating against the rotational force received when the bolt 9 is tightened. Further, when the connection terminal A11 and the conductive bush 8 are press-fitted, the protrusion shape may be formed on the conductive bush side. For example, in order to increase the holding force of the conductive bush 8 with the coil case, a plurality of grooves may be formed in the outer diameter portion of the conductive bush, and it is also effective to press-fit using this protrusion (groove). It becomes a means.

図4においての接続構造は、接続端子A11の端部にC型形状を形成させ、前記C型部に導電性ブッシュ8を嵌め込むことで電気的接続を図る方法である。   The connection structure in FIG. 4 is a method of achieving electrical connection by forming a C shape at the end of the connection terminal A11 and fitting the conductive bush 8 into the C shape portion.

図5においての接続構造は、線状に形成させた接続端子A11の端部をスプリング状に形成させ、前記スプリング内径部に導電性ブッシュを軽圧入することで電気的接続を図る方法である。接続端子A11を線材で形成させることにより安価な構造とすることができる。   The connection structure in FIG. 5 is a method of achieving electrical connection by forming the end portion of the connection terminal A11 formed in a line shape in a spring shape and lightly press-fitting a conductive bush into the inner diameter portion of the spring. An inexpensive structure can be obtained by forming the connection terminal A11 with a wire.

また、コイルケースのフランジ内部には接続端子が内挿されるためフランジ部の強度アップとなり、耐振性向上も図れる。   Further, since the connection terminal is inserted into the flange of the coil case, the strength of the flange portion is increased, and the vibration resistance can be improved.

本実施例の実施の態様について纏めると以下の通りである。   It is as follows when the aspect of an Example is summarized.

〔実施の態様1〕
空隙部を設けた閉磁路を形成する鉄心と、鉄心の外周に巻回された1次コイル,2次コイルをコイルケース内に収容し、各部材の隙間に電気的絶縁を行うための絶縁樹脂を充填させている点火コイルにおいて、前記鉄心はアースされている導電性のエンジンヘッド、及び、バッテリから電源を供給するために前記コイルケースに設けられるコネクタのGND端子、と電気的接続されることを特徴とする内燃機関用点火コイル。
Embodiment 1
Insulating resin for containing a core that forms a closed magnetic path with a gap and a primary coil and a secondary coil wound around the outer periphery of the core in a coil case and electrically insulating gaps between the members. In the ignition coil filled with, the iron core is electrically connected to a grounded conductive engine head and a GND terminal of a connector provided in the coil case for supplying power from a battery. An ignition coil for an internal combustion engine.

〔実施の態様2〕
前記鉄心と、点火コイルをエンジンヘッドに固定するためにコイルケース外周部に設けられる導電性ブッシュは、導電性材で形成された接続端子Aを介し電気的接続され、前記鉄心と、前記コネクタのGND端子は、導電性材で形成された接続端子Bを介し電気的接続されている構造を備える実施の態様1の内燃機関用点火コイル。
Embodiment 2
A conductive bush provided on the outer periphery of the coil case for fixing the ignition coil to the engine head is electrically connected via a connection terminal A formed of a conductive material, and the iron core and the connector The ignition coil for an internal combustion engine according to the first embodiment, wherein the GND terminal has a structure in which the GND terminal is electrically connected via a connection terminal B formed of a conductive material.

〔実施の態様3〕
前記導電性ブッシュと接続端子Aは、前記コイルケース内の前記導電性ブッシュが固定されている樹脂内部で電気的に接続されていることを特徴とする実施の態様1,2の内燃機関用点火コイル。
[Embodiment 3]
The ignition for an internal combustion engine according to the first and second embodiments, wherein the conductive bush and the connection terminal A are electrically connected inside a resin to which the conductive bush in the coil case is fixed. coil.

〔実施の態様4〕
導電性ブッシュと接続端子Aとは、溶接または導電性接着剤により電気的接続をさせ、コイルケース成形時にコイルケースにインサートさせることを特徴とした実施の態様1〜3の内燃機関用点火コイル。
Embodiment 4
The ignition coil for an internal combustion engine according to any one of embodiments 1 to 3, wherein the conductive bush and the connection terminal A are electrically connected by welding or a conductive adhesive and are inserted into the coil case when the coil case is formed.

〔実施の態様5〕
導電性ブッシュと接続端子Aとは、板状に形成させた接続端子Aの先端部に穴を設け、穴の内側には突起部を複数個形成し、前記突起部に導電性ブッシュ外周が圧入させることにより電気的接続をさせ、コイルケース成形時にコイルケースにインサートさせることを特徴とした実施の態様1〜3の内燃機関用点火コイル。
[Embodiment 5]
The conductive bush and the connection terminal A are provided with a hole at the tip of the connection terminal A formed in a plate shape, a plurality of protrusions are formed inside the hole, and the outer periphery of the conductive bush is press-fitted into the protrusion. An ignition coil for an internal combustion engine according to the first to third embodiments, wherein the ignition coil is electrically connected to be inserted into the coil case when the coil case is formed.

〔実施の態様6〕
導電性ブッシュと接続端子Aとは、接続端子Aの先端部にC型形状を形成し、前記C型部に導電性ブッシュを嵌め込こむことにより電気的接続をさせ、コイルケース成形時にコイルケースにインサートさせることを特徴とした実施の態様1〜3の内燃機関用点火コイル。
[Embodiment 6]
The conductive bush and the connection terminal A are formed in a C-shape at the tip of the connection terminal A, and are electrically connected by fitting the conductive bush into the C-shaped portion. An ignition coil for an internal combustion engine according to any one of embodiments 1 to 3, wherein the ignition coil is inserted into the internal combustion engine.

〔実施の態様7〕
導電性ブッシュと接続端子Aとは、線状に形成させた接続端子Aの先端をスプリング状に形成し、前記スプリング内径部に導電性ブッシュを軽圧入することにより電気的接続をさせ、コイルケース成形時にコイルケースにインサートさせることを特徴とした実施の態様1〜3の内燃機関用点火コイル。
[Embodiment 7]
The conductive bush and the connection terminal A are formed in a coil shape by forming the tip of the connection terminal A, which is formed in a linear shape, into a spring shape, and lightly press-fitting the conductive bush into the inner diameter portion of the spring. An ignition coil for an internal combustion engine according to Embodiments 1 to 3, wherein the ignition coil is inserted into a coil case during molding.

内燃機関用点火コイルの全体縦断面図。The whole longitudinal cross-sectional view of the ignition coil for internal combustion engines. 電気導体の端子と導電性金属ブッシュとの接続構造の一実施例。An example of the connection structure of the terminal of an electrical conductor and a conductive metal bush. 電気導体の端子と導電性金属ブッシュとの接続構造の他の実施例。Another embodiment of a connection structure between a terminal of an electric conductor and a conductive metal bush. 電気導体の端子と導電性金属ブッシュとの接続構造の他の実施例。Another embodiment of a connection structure between a terminal of an electric conductor and a conductive metal bush. 電気導体の端子と導電性金属ブッシュとの接続構造の他の実施例。Another embodiment of a connection structure between a terminal of an electric conductor and a conductive metal bush.

符号の説明Explanation of symbols

1 1次コイル
2 2次コイル
3 鉄心
3a サイド鉄心
3b センター鉄心
4 コイルケース
5 絶縁樹脂
6 スプリング
7 点火プラグ
8 導電性ブッシュ
8a 段付き部
9 締め付けボルト
10 エンジンヘッド
11 接続端子A
11a 突起部
12 接続端子B
13 GNG端子
DESCRIPTION OF SYMBOLS 1 Primary coil 2 Secondary coil 3 Iron core 3a Side iron core 3b Center iron core 4 Coil case 5 Insulation resin 6 Spring 7 Spark plug 8 Conductive bushing 8a Stepped part 9 Tightening bolt 10 Engine head 11 Connection terminal A
11a Protrusion 12 Connection terminal B
13 GNG terminal

Claims (5)

内燃機関の点火プラグに高電圧を供給する点火コイルを備えた点火コイル装置であって、樹脂成形体で形成されたコイルケースを備え、
当該コイルケースには前記点火コイルを電源,電源アースあるいは外部回路と接続するための端子を備えたコネクタ部が一体に樹脂成形されており、
さらにコイルケースには前記アース電位の部材に接触する導電性金属ブッシュであって、前記点火コイル装置を前記アース電位の部材に固定するためのボルトが挿通する孔を有すると共に、前記ボルトでエンジンヘッド等に締め付けて固定される金属ブッシュが一緒に樹脂成形されており、
前記コネクタに設けられた前記電源アース端子に一端が接続された第一の電気導体の他端が鉄心に電気的に接続されており、前記鉄心に一端が接続された第二の電気導体の他端が前記金属ブッシュの外周で前記金属ブッシュに電気的に接続されており、
前記第二の電気導体及びその接続部は前記金属ブッシュ及び前記コネクタと共に前記コイルケースを形成する前記樹脂成形体の内部に一体に樹脂成形されている内燃機関用点火コイル。
An ignition coil device including an ignition coil for supplying a high voltage to an ignition plug of an internal combustion engine, comprising a coil case formed of a resin molded body,
The coil case is integrally molded with a connector having a terminal for connecting the ignition coil to a power source, a power source ground or an external circuit,
Furthermore, the coil case has a conductive metal bush that contacts the member having the ground potential, and has a hole through which a bolt for fixing the ignition coil device to the member having the ground potential is inserted. Metal bushes that are fastened and fixed together are resin molded together,
The other end of the first electrical conductor having one end connected to the power ground terminal provided in the connector is electrically connected to the iron core, and the other of the second electric conductor having one end connected to the iron core. The end is electrically connected to the metal bush at the outer periphery of the metal bush,
The ignition coil for an internal combustion engine, wherein the second electric conductor and its connecting portion are integrally resin-molded inside the resin molded body forming the coil case together with the metal bush and the connector.
請求項1に記載のものにおいて、
前記接続部は前記第二の電気導体と前記金属ブッシュとの接続部である内燃機関用点火コイル。
In claim 1,
The connecting portion is an ignition coil for an internal combustion engine is a connection portion between the metal bushing and the second electrical conductor.
請求項1または2いずれかに記載のものにおいて、
前記第二の電気導体の他端は、板状に形成されており、当該板状部には孔が設けられており、この孔の内側には半径方向内側に突出する突起部が複数個設けられており、前記突起部が前記金属ブッシュの外周に圧入されて電気的接続部を構成しており、当該接続部が前記コイルケースの前記樹脂成形体にインサート成形されている内燃機関用点火コイル。
In the one according to claim 1 or 2 ,
The other end of the second electric conductor is formed in a plate shape, and a hole is provided in the plate-like portion, and a plurality of protrusions protruding radially inward are provided inside the hole. An ignition coil for an internal combustion engine in which the projection is press-fitted into the outer periphery of the metal bush to form an electrical connection, and the connection is insert-molded in the resin molded body of the coil case .
請求項1または2いずれかに記載のものにおいて、
前記第二の電気導体の他端部に半環状の板状部が形成されており、前記半環状の板状部が前記金属ブッシュの外周に嵌め込まれて電気的接続部を構成しており、当該接続部が前記コイルケースの前記樹脂成形体にインサート成形されている内燃機関用点火コイル。
In the one according to claim 1 or 2 ,
A semi-annular plate-like portion is formed at the other end of the second electric conductor , and the semi-annular plate-like portion is fitted into the outer periphery of the metal bush to constitute an electrical connection portion, An internal combustion engine ignition coil in which the connecting portion is insert-molded in the resin molded body of the coil case.
請求項1または2のいずれかに記載のものにおいて、
前記第二の電気導体の他端部に弦巻状部が形成されており、前記弦巻状部が前記金属ブッシュの外周に巻き付けられて電気的接続部を構成しており、当該電気的接続部が前記コイルケースの前記樹脂成形体にインサート成形されている内燃機関用点火コイル。
In the one according to claim 1 or 2 ,
A string winding portion is formed at the other end of the second electrical conductor , and the string winding portion is wound around the outer periphery of the metal bush to constitute an electrical connection portion, and the electrical connection portion is An ignition coil for an internal combustion engine, which is insert-molded in the resin molded body of the coil case.
JP2008111971A 2008-04-23 2008-04-23 Ignition coil for internal combustion engine Expired - Fee Related JP5291978B2 (en)

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