JP2003229319A - Ignition coil for internal combustion engine - Google Patents
Ignition coil for internal combustion engineInfo
- Publication number
- JP2003229319A JP2003229319A JP2002024907A JP2002024907A JP2003229319A JP 2003229319 A JP2003229319 A JP 2003229319A JP 2002024907 A JP2002024907 A JP 2002024907A JP 2002024907 A JP2002024907 A JP 2002024907A JP 2003229319 A JP2003229319 A JP 2003229319A
- Authority
- JP
- Japan
- Prior art keywords
- combustion engine
- internal combustion
- center core
- coil
- ignition coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関用点火コ
イルに関する。特に、エンジンの点火プラグ毎に装着さ
れて各点火プラグに直結して使用される独立点火形の内
燃機関用点火コイルに関する。TECHNICAL FIELD The present invention relates to an ignition coil for an internal combustion engine. In particular, the present invention relates to an independent ignition type ignition coil for an internal combustion engine, which is attached to each spark plug of an engine and is directly connected to each spark plug for use.
【０００２】[0002]
【従来の技術】内燃機関用点火コイルに関し、特開平１
０−９２６７０号公報，特開平１１−２４３０２３号公
報，特開平１１−３５４３４５号公報，特開２０００−
91144号公報及び特開２０００−２２８３２２号公報に
記載がある。2. Description of the Related Art An ignition coil for an internal combustion engine is disclosed in Japanese Patent Laid-Open No.
No. 0-92670, JP-A No. 11-243023, JP-A No. 11-354345, and JP-A 2000-
It is described in JP-A-91144 and JP-A-2000-228322.
【０００３】[0003]
【発明が解決しようとする課題】前記、センタコアと２
次ボビン間を弾性部材としたのは、ペンシルコイル（プ
ラグホール内装着式の独立点火コイル）が厳しい温度環
境（−４０℃〜１３０℃程度の熱ストレス）にさらされ
ることに加えて、各構成部材間の線膨張係数差による熱
応力が働くためであり、特に、センタコアの線膨張係数
（１３×１０-6程度）と絶縁用樹脂の線膨張係数（４０
×１０-6程度）との差が大きいため、過度の熱応力が働
き、通常の絶縁用樹脂（弾性部材に替わり硬質のエポキ
シ樹脂組成物）を用いた場合には、絶縁用樹脂にクラッ
クが生じ、絶縁破壊が起こる心配があるためである。こ
のような熱応力に対処するため、応力吸収に優れた弾性
を持つ弾性部材を用いている。しかし、ペンシルコイル
のように、コイル部がプラグホール内に内挿されるもの
は、スペースに裕度がなく、弾性部材の層が十分取れな
い場合があり、最も熱応力によるダメージの受け易い樹
脂製の２次ボビンが周方向の応力によりクラックが生じ
る。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The elastic member between the next bobbins is that the pencil coil (independent ignition coil in the plug hole) is exposed to severe temperature environment (heat stress of about -40 ° C to 130 ° C). thermal stress due to difference in linear expansion coefficient between the members is because the work, in particular, the linear expansion coefficient of the center core (13 × 10 -6) and the linear expansion coefficient of the insulating resin (40
X10 -6 ) is large, and excessive thermal stress acts, and when a normal insulating resin (hard epoxy resin composition instead of the elastic member) is used, the insulating resin is cracked. This is because there is a concern that this may occur and dielectric breakdown may occur. To cope with such thermal stress, an elastic member having elasticity that is excellent in stress absorption is used. However, a pencil coil, whose coil part is inserted in the plug hole, does not have enough space, and the elastic member layer may not be removed sufficiently. The secondary bobbin causes a crack due to the circumferential stress.
【０００４】本発明の目的は、熱応力を一層緩和でき、
信頼性向上することができる内燃機関用点火コイルを提
供することである。The object of the present invention is to further reduce thermal stress,
An object of the present invention is to provide an ignition coil for an internal combustion engine that can improve reliability.
【０００５】[0005]
【課題を解決するための手段】２次ボビンに加わる熱応
力を十分緩和するため、センタコアと２次ボビン間に剥
離層を設ける構造とする。例えば、センタコアと弾性部
材間に剥離層を設けることで、センタコアと弾性部材間
に滑りが生じ、互いに働く応力をキャンセルすることが
でき、センタコア側から２次ボビンに加わる応力を緩和
できる。In order to sufficiently reduce the thermal stress applied to the secondary bobbin, a peeling layer is provided between the center core and the secondary bobbin. For example, by providing the release layer between the center core and the elastic member, slippage between the center core and the elastic member occurs, and the stresses acting on each other can be canceled, and the stress applied to the secondary bobbin from the center core side can be relaxed.
【０００６】[0006]
【発明の実施の形態】独立点火形の点火コイルは、コイ
ル部の少なくても一部がプラグホール内に導入されて装
着される為プラグ内装着式と称され、また、コイル部は
プラグホール内に挿入される為にペンシル形に細長くペ
ンシルコイルと通称され、細長円筒形のコイルケース内
部にセンタコア（磁路鉄心で珪素鋼板を多数積層したも
の）、１次コイル，２次コイルを内装している。１次コ
イルに流す電流の通電，遮断制御により２次コイルに点
火に必要な高電圧を発生させるもので、これらのコイル
は、通常それぞれのボビンに巻かれ、センタコアの周囲
に同心上をなして配置されている。BEST MODE FOR CARRYING OUT THE INVENTION An independent ignition type ignition coil is called an in-plug mounting type because at least a part of the coil portion is introduced into the plug hole and mounted, and the coil portion has a plug hole. Since it is inserted into the inside, it is commonly referred to as a pencil-shaped slender pencil coil. Inside the slender cylindrical coil case, a center core (one in which a number of silicon steel plates are laminated with a magnetic path core), a primary coil, and a secondary coil are installed. ing. The high voltage required for ignition is generated in the secondary coil by controlling the energization and interruption of the current flowing in the primary coil. These coils are usually wound around their respective bobbins and are concentrically formed around the center core. It is arranged.
【０００７】ボビン類はポリブチレンテレフタレート，
ＰＰＳ，変性ＰＰＯなどの熱可塑性樹脂で形成され、そ
れに銅線であるコイルが巻線される。２次ボビン内側に
は、珪素鋼板が積層されたセンタコアが、センタコアと
２次ボビン間には、弾性部材が配置され、それらの各構
成部材間には絶縁用樹脂が注型される。したがって金属
と樹脂とが隣り合うため線膨張係数の差が大きくなり易
い構造となっている。The bobbins are polybutylene terephthalate,
It is formed of a thermoplastic resin such as PPS or modified PPO, and a coil which is a copper wire is wound around it. Inside the secondary bobbin, a center core in which silicon steel plates are laminated, an elastic member is arranged between the center core and the secondary bobbin, and an insulating resin is cast between the respective constituent members. Therefore, since the metal and the resin are adjacent to each other, the difference in linear expansion coefficient is likely to be large.
【０００８】以下、実施の形態について、図面を参照し
説明する。Embodiments will be described below with reference to the drawings.
【０００９】図１は、実施例である内燃機関用点火コイ
ルの構成を示す断面図である。FIG. 1 is a sectional view showing the structure of an ignition coil for an internal combustion engine which is an embodiment.
【００１０】細長円筒形ケース（外装ケース）６の内部
には、中心（内側）から外側に向けて、センタコア５，
２次ボビン４に巻かれた２次コイル３，１次ボビン２に
巻かれた１次コイル１が同心状に配置されている。これ
らの構成部品は、外装ケース６に内挿された後、熱硬化
性絶縁用樹脂１４が充填されている。外装ケース６の外
側には、センタコア５と磁路を形成するサイドコア７が
装着されている。Inside the elongated cylindrical case (exterior case) 6, from the center (inside) to the outside, the center core 5,
A secondary coil 3 wound around a secondary bobbin 4 and a primary coil 1 wound around a primary bobbin 2 are arranged concentrically. These components are filled with the thermosetting insulating resin 14 after being inserted into the outer case 6. A side core 7 that forms a magnetic path with the center core 5 is attached to the outside of the outer case 6.
【００１１】サイドコア７は、０.２〜０.５mm程度の薄
い珪素鋼板あるいは方向性珪素鋼板を管状に丸めて成形
され、１〜４枚重ねている。ただし、磁束の１ターンシ
ョートを防ぐ為、サイドコア７の円周上の少なくとも１
ヶ所は切れ目を設けている。The side core 7 is formed by rolling a thin silicon steel plate having a thickness of about 0.2 to 0.5 mm or a grain-oriented silicon steel plate into a tubular shape and stacking one to four sheets. However, in order to prevent short circuit of one turn of magnetic flux, at least 1 on the circumference of the side core 7
There are cuts at some places.
【００１２】センタコア５は、板厚０.２〜０.７mmの珪
素鋼板あるいは方向性珪素鋼板を使用し、その断面積を
増やすように円筒形に近づけ、例えば幅長さを数段階に
設定した多数の珪素鋼板をプレス積層してなる。ここで
は図示していないが、センタコア５の軸方向の片端面、
あるいは両端面にマグネットを設けコイルで発生する磁
束とは反対の磁束をかけることで磁束密度の高いコアを
使用した状態を作り磁気エネルギをアップさせる場合も
ある。The center core 5 is made of a silicon steel plate or a grain-oriented silicon steel plate having a plate thickness of 0.2 to 0.7 mm. The center core 5 is close to a cylindrical shape so as to increase its cross-sectional area. For example, the width and length are set in several stages. A number of silicon steel plates are laminated by pressing. Although not shown here, one end surface of the center core 5 in the axial direction,
Alternatively, magnets may be provided on both end faces to apply a magnetic flux opposite to the magnetic flux generated by the coil to create a state in which a core having a high magnetic flux density is used to increase the magnetic energy.
【００１３】センタコア５の端部（上端でも下端でも良
い）には応力吸収用弾性部材８（例えばシリコーンゴ
ム），センタコア５の周囲にはやはり弾性部材１５が設
けられ、２次ボビン４とセンタコア５間に発生する熱応
力（線膨張係数の差によって生じる応力）を緩和してい
る。弾性部材１５としては耐熱性のあるシリコーンゴム
（本例では、可とう性エポキシ樹脂）などで構成され
る。可とう性エポキシ樹脂は、ガラス転移点が常温（２
０℃）以下で、ガラス転移点以上では弾性のある柔らか
い性質（エストラマー）を有するエポキシ樹脂であり、
例えば、エポキシ樹脂と変性脂肪族ポリアミンの混合物
である。An elastic member 8 (for example, silicone rubber) for absorbing stress is provided at the end (the upper end or the lower end) of the center core 5, and an elastic member 15 is also provided around the center core 5, and the secondary bobbin 4 and the center core 5 are provided. The thermal stress (stress caused by the difference in the coefficient of linear expansion) generated between them is relaxed. The elastic member 15 is made of heat-resistant silicone rubber (flexible epoxy resin in this example) or the like. A flexible epoxy resin has a glass transition temperature of room temperature (2
(0 ° C.) or lower, and an epoxy resin having elastic and soft properties (elastomer) at a glass transition point or higher,
For example, a mixture of epoxy resin and modified aliphatic polyamine.
【００１４】１次ボビン２は、機械的強度を確保するた
め無機物充填物２０重量％以上のポリブチレンテレフタ
レート(ＰＢＴ）やポリフェニレンオキサイド(変性ＰＰ
Ｏ）、あるいはポリフェニレンサルファイド（ＰＰＳ）
等の熱可塑性合成樹脂で形成され、この１次ボビン２に
巻かれる１次コイル１は、線径０.３〜１.０mm程度のエ
ナメル線を一層あたり数十回から百数十回ずつ、数層に
わたり合計１００〜３００回程度積層巻きした巻線であ
る。The primary bobbin 2 contains polybutylene terephthalate (PBT) or polyphenylene oxide (modified PP) containing 20% by weight or more of an inorganic filler in order to secure mechanical strength.
O), or polyphenylene sulfide (PPS)
The primary coil 1 formed of a thermoplastic synthetic resin such as, and wound on the primary bobbin 2 is an enamel wire having a wire diameter of about 0.3 to 1.0 mm, which is tens to hundreds of times per layer. It is a winding in which several layers are wound 100 to 300 times in total.
【００１５】２次ボビン４も例えば、無機物を２０重量
％以上、より好ましくは３０重量％以上混合した変性ポ
リフェニレンオキサイド（変性ＰＰＯ），ポリフェニレ
ンサルファイド（ＰＰＳ）等の熱可塑性合成樹脂で成形
されている。２次ボビン４は有底筒状を呈し、上記した
応力吸収用弾性部材８，センタコア５が２次ボビン底部
に受けられるようにして２次ボビン４に内装されてい
る。The secondary bobbin 4 is also formed of a thermoplastic synthetic resin such as modified polyphenylene oxide (modified PPO) or polyphenylene sulfide (PPS) in which an inorganic substance is mixed in an amount of 20% by weight or more, more preferably 30% by weight or more. . The secondary bobbin 4 has a cylindrical shape with a bottom, and is installed in the secondary bobbin 4 so that the stress absorbing elastic member 8 and the center core 5 are received by the bottom portion of the secondary bobbin.
【００１６】２次ボビン４はセンタコア５と２次コイル
３の間に介在して２次コイル３で発生した高電圧を絶縁
する役目もある。２次コイル３で発生した高電圧を絶縁
するためには、２次ボビン４の肉厚を０.５〜１.５mmと
し、更に２次コイル３とセンタコア５間の電界集中及び
応力集中を防止するために、センタコア５は２次ボビン
４の内周側に弾性部材１５を注入し、硬化して固定して
いる。本実施態様ではセンタコア５と弾性部材１５間に
剥離層２２を設けることであるが、この点については図
２，図３，図４を用いて後述する。The secondary bobbin 4 is also interposed between the center core 5 and the secondary coil 3 and also serves to insulate the high voltage generated in the secondary coil 3. In order to insulate the high voltage generated in the secondary coil 3, the thickness of the secondary bobbin 4 is set to 0.5 to 1.5 mm, and electric field concentration and stress concentration between the secondary coil 3 and the center core 5 are prevented. In order to do so, the elastic member 15 is injected into the center bobbin 5 on the inner peripheral side of the secondary bobbin 4, and is cured and fixed. In this embodiment, the peeling layer 22 is provided between the center core 5 and the elastic member 15. This point will be described later with reference to FIGS. 2, 3 and 4.
【００１７】２次コイル３は、線径０.０３〜０.０６mm
程度のエナメル線を用いて合計１００００〜３００００
回程度、２次ボビン４に多数配設した鍔４ａ間に多層構
造で分割巻きされている。The secondary coil 3 has a wire diameter of 0.03 to 0.06 mm.
A total of 10,000 to 30,000 using approximately enamel wire
About a number of times, a plurality of collars 4a arranged on the secondary bobbin 4 are divided and wound in a multilayer structure.
【００１８】絶縁用樹脂１４は、２次ボビン４に巻かれ
た２次コイル３，１次ボビン２に巻かれた１次コイル１
を外装ケース６に内挿し、更にイグナイタユニット１９
を供給しイグナイタユニットの端子１９ａをコネクタ端
子２１と溶接固定した後、真空状態で注入される。そし
て加熱により絶縁用樹脂１４が硬化することで絶縁性と
機械強度を確保することができる。The insulating resin 14 includes a secondary coil 3 wound around a secondary bobbin 4 and a primary coil 1 wound around a primary bobbin 2.
Is inserted in the outer case 6, and the igniter unit 19
Is supplied and the terminal 19a of the igniter unit is welded and fixed to the connector terminal 21, and then injected in a vacuum state. Then, the insulating resin 14 is cured by heating, so that the insulating property and the mechanical strength can be secured.
【００１９】イグナイタユニット１９は、パワー素子
（半導体チップ）と電流制限回路などの電子回路部が１
チップ化されたものが内蔵され、エポキシ樹脂で外装モ
ールドされている。本実施例ではパワー素子としてＩＧ
ＢＴ（絶縁ゲート型バイポーラトランジスタ）を採用し
ており、２ｍＡ〜１０ｍＡの低電流で駆動できるように
している。また、このように１チップ化することで製造
工程の簡略化による大幅なコスト低減を図ることができ
る。The igniter unit 19 includes a power element (semiconductor chip) and an electronic circuit section such as a current limiting circuit.
It is built into chips and is externally molded with epoxy resin. In this embodiment, the IG is used as a power element.
BT (Insulated Gate Bipolar Transistor) is adopted so that it can be driven with a low current of 2 mA to 10 mA. Further, by forming one chip as described above, it is possible to significantly reduce the cost by simplifying the manufacturing process.
【００２０】外装ケース６は、ポリフェニレンサルファ
イド（ＰＰＳ）等の熱可塑性合成樹脂で成形されてお
り、コイル部を収容，固定し絶縁用樹脂１４を注型でき
るようにしている。The outer case 6 is made of a thermoplastic synthetic resin such as polyphenylene sulfide (PPS) and accommodates and fixes the coil portion so that the insulating resin 14 can be cast.
【００２１】１３は過早着火防止の高圧ダイオード、１
２はイタバネ、１１は高圧端子、９は点火プラグ接続用
のスプリング、１０は点火プラグ接続用プラグシール
（シリコーンゴム）である。１８は外観上の見栄えを良
くするためのカバーであり、絶縁用樹脂１４の注型面に
取り付けられる。コネクタケース１７と外装ケース６と
の嵌合部には、プラグホール内への水の浸入を防ぐため
プラグホールシール１６が装着される。２０は雑音防止
用のコンデンサであり、リード付きのセラミックタイプ
のコンデンサを逆さまにして配置しリードをコネクタ端
子２１と溶接で接続，固定している。13 is a high-voltage diode for preventing premature ignition, 1
Reference numeral 2 is an ita spring, 11 is a high-voltage terminal, 9 is a spring for connecting a spark plug, and 10 is a plug seal (silicone rubber) for connecting a spark plug. Reference numeral 18 is a cover for improving the appearance, and is attached to the casting surface of the insulating resin 14. A plug hole seal 16 is attached to the fitting portion between the connector case 17 and the outer case 6 to prevent water from entering the plug hole. Reference numeral 20 denotes a noise preventing capacitor, in which a ceramic type capacitor with a lead is arranged upside down and the lead is connected and fixed to the connector terminal 21 by welding.
【００２２】次に、センタコア５と弾性部材１５間に剥
離層２２を設けることについて図２，図３，図４を用い
て詳しく説明する。Next, the provision of the release layer 22 between the center core 5 and the elastic member 15 will be described in detail with reference to FIGS. 2, 3 and 4.
【００２３】エンジン運転停止後の温度降下により点火
コイルが熱収縮しようとすると、線膨張係数の大きな２
次ボビン４（３０×１０-6程度）は収縮するが、線膨張
係数の小さいセンタコア５（１３×１０-6程度）は収縮
が小さいため、弾性部材１５を介して、２次ボビン４に
は、センタコア５側から熱収縮（線膨張係数差）により
周方向に拡張力が作用する。また、１次コイル１，２次
コイル３側からは絶縁用樹脂を介して相対的に周方向の
引張り力が作用し、それらの相乗作用により２次ボビン
４には、大きな内部応力σが発生するが、本実施態様で
は、センタコア５側から２次ボビン４に作用する周方向
の拡張力をセンタコア５と弾性部材１５間に剥離層２２
を設けることで、センタコア５と弾性部材１５間に滑り
が生じ、互いに働く応力をキャンセルすることができ、
２次ボビン４内部に加わる熱応力を低減（緩和）するこ
とができる。When the ignition coil tries to thermally contract due to the temperature drop after the engine is stopped, the linear expansion coefficient becomes large.
The next bobbin 4 (about 30 × 10 −6 ) contracts, but the center core 5 (about 13 × 10 −6 ) having a small linear expansion coefficient has a small contraction. An expanding force acts in the circumferential direction from the side of the center core 5 due to thermal contraction (difference in linear expansion coefficient). Further, a tensile force in the circumferential direction relatively acts from the primary coil 1 and secondary coil 3 side via the insulating resin, and a large internal stress σ is generated in the secondary bobbin 4 due to their synergistic effect. However, in the present embodiment, the expansion force in the circumferential direction acting on the secondary bobbin 4 from the side of the center core 5 is applied to the peeling layer 22 between the center core 5 and the elastic member 15.
By providing, the center core 5 and the elastic member 15 slip, and the stresses acting on each other can be canceled.
The thermal stress applied to the inside of the secondary bobbin 4 can be reduced (relaxed).
【００２４】したがって、２次ボビンに生じる応力σの
うちセンタコア５と２次ボビン４の熱収縮によって２次
ボビン４に生じる熱応力分σ1 を減少させることで、ト
ータルの応力σを小さくすることが可能になる。ＣＡＥ
（Computer AidedEngineering）解析結果（図４）によ
れば、上記した応力分σ1 を減少させることで、全体の
内部応力σの約１０％低減（緩和）させることが可能に
なる。また、剥離層２２を設けたサンプル品の熱衝撃性
を評価したところ、約２０％寿命が向上することが確認
できた。Therefore, of the stress σ generated in the secondary bobbin, the total stress σ is reduced by reducing the thermal stress σ 1 generated in the secondary bobbin 4 due to the thermal contraction of the center core 5 and the secondary bobbin 4. Will be possible. CAE
According to the (Computer Aided Engineering) analysis result (FIG. 4), it is possible to reduce (relieve) the overall internal stress σ by about 10% by reducing the stress component σ 1 . Further, when the thermal shock resistance of the sample product provided with the release layer 22 was evaluated, it was confirmed that the life was improved by about 20%.
【００２５】次に、別例を図５に示す。剥離層２２はセ
ンタコア５と２次ボビン４間にあれば応力緩和するた
め、前記、同様の効果が得られる。Another example is shown in FIG. If the peeling layer 22 is between the center core 5 and the secondary bobbin 4, the stress is relieved, so that the same effect as described above can be obtained.
【００２６】図５（ａ）は、センタコア５にシリコーン
やフッ素等を主成分とするテープ２３等を被せテープ２
３と弾性部材１５間に剥離層２２を設ける。In FIG. 5 (a), the center core 5 is covered with a tape 23 containing silicone, fluorine or the like as a main component, and the tape 2
A peeling layer 22 is provided between the elastic member 15 and the elastic member 15.
【００２７】図５（ｂ）は、２次ボビン４内面にシリコ
ーンやフッ素等を主成分とするコーティングを施し、２
次ボビン４と弾性部材１５間に剥離層を設ける。In FIG. 5 (b), the inner surface of the secondary bobbin 4 is coated with silicone, fluorine or the like as a main component.
A peeling layer is provided between the next bobbin 4 and the elastic member 15.
【００２８】以上のような構造をとれば、過酷な温度環
境にさらされる独立点火形の点火コイルにおいて、高品
質，高信頼性を図ることができる。With the structure as described above, it is possible to achieve high quality and high reliability in an independent ignition type ignition coil which is exposed to a severe temperature environment.
【００２９】[0029]
【発明の効果】本発明によれば、熱応力を一層緩和で
き、信頼性向上することができる内燃機関用点火コイル
を提供することができる。According to the present invention, it is possible to provide an ignition coil for an internal combustion engine which can further reduce thermal stress and improve reliability.
【図１】本発明の内燃機関用点火コイルの断面図。FIG. 1 is a sectional view of an ignition coil for an internal combustion engine of the present invention.
【図２】図１のＡ−Ａの横断面図。2 is a cross-sectional view taken along the line AA of FIG.
【図３】図２を半割にして局部的に断面した図。FIG. 3 is a partial cross-sectional view of FIG.
【図４】ＣＡＥ解析結果。FIG. 4 CAE analysis results.
【図５】別例の横断面。FIG. 5 is a cross section of another example.
１…１次コイル、２…１次ボビン、３…２次コイル、４
…２次ボビン、４ａ…鍔、５…センタコア、６…外装ケ
ース、７…サイドコア、８…応力吸収用弾性部材、９…
スプリング、１０…プラグシール、１１…高圧端子、１
２…イタバネ、１３…高圧ダイオード、１４…絶縁用樹
脂（エポキシ樹脂）、１５…弾性部材（可とう性エポキ
シ樹脂）、１６…プラグホールシール、１７…コネクタ
ケース、１８…カバー、１９…イグナイタユニット、１
９ａ…ユニット端子、２０…雑音防止コンデンサ、２１
…コネクタ端子、２２…剥離層、２３…テープ。1 ... Primary coil, 2 ... Primary bobbin, 3 ... Secondary coil, 4
... secondary bobbin, 4a ... tsuba, 5 ... center core, 6 ... exterior case, 7 ... side core, 8 ... stress absorbing elastic member, 9 ...
Spring, 10 ... Plug seal, 11 ... High voltage terminal, 1
2 ... Ita spring, 13 ... High voltage diode, 14 ... Insulating resin (epoxy resin), 15 ... Elastic member (flexible epoxy resin), 16 ... Plug hole seal, 17 ... Connector case, 18 ... Cover, 19 ... Igniter unit 1
9a ... Unit terminal, 20 ... Noise prevention capacitor, 21
... connector terminals, 22 ... release layer, 23 ... tape.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 橋本 学 茨城県ひたちなか市大字高場2520番地 株 式会社日立製作所自動車機器グループ内 Ｆターム(参考） 3G019 KC04 KC06 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Manabu Hashimoto Hitachinaka City, Ibaraki Prefecture 2520 Takaba Ceremony Company Hitachi Ltd. Automotive equipment group F-term (reference) 3G019 KC04 KC06
Claims (7)
火プラグに直結して使用さる独立点火形の内燃機関用点
火コイルであって、コイルケース内に内側から順にセン
タコア，２次ボビンに巻かれた２次コイル，１次ボビン
に巻かれた１次コイルが同心上に配置され、これらの構
成部材間に絶縁用樹脂が充填されている内燃機関用点火
コイルにおいて、 前記、センタコアと２次ボビン間に剥離層を設けること
を特徴とする内燃機関用点火コイル。1. An independent ignition type ignition coil for an internal combustion engine which is inserted into a plug hole of an internal combustion engine and directly connected to each ignition plug for use, wherein a center core and a secondary bobbin are arranged in a coil case in order from the inside. An internal combustion engine ignition coil in which a wound secondary coil and a primary coil wound around a primary bobbin are concentrically arranged, and an insulating resin is filled between these constituent members, wherein An ignition coil for an internal combustion engine, characterized in that a peeling layer is provided between the next bobbins.
ン間に弾性を持つ弾性部材が存在し、該センタコアと弾
性部材間に剥離層を設けることを特徴とする内燃機関用
点火コイル。2. An ignition coil for an internal combustion engine according to claim 1, wherein an elastic member having elasticity exists between the center core and the secondary bobbin, and a peeling layer is provided between the center core and the elastic member.
主成分とするコーティングをセンタコアに施すことで、
剥離層を形成することを特徴とする内燃機関用点火コイ
ル。3. The coating according to claim 2, wherein the center core is coated with silicone or fluorine,
An ignition coil for an internal combustion engine, characterized in that a peeling layer is formed.
をもたらすテープ等を被せテープと弾性部材間に剥離層
を設けることを特徴とする内燃機関用点火コイル。4. The ignition coil for an internal combustion engine according to claim 1, wherein the center core is covered with a tape or the like that causes a peeling action, and a peeling layer is provided between the tape and the elastic member.
作用をもたらすコーティングを施し、２次ボビンと弾性
部材間に剥離層を設けることを特徴とする内燃機関用点
火コイル。5. An ignition coil for an internal combustion engine according to claim 1, wherein the inner surface of the secondary bobbin is coated with a peeling action, and a peeling layer is provided between the secondary bobbin and the elastic member.
とう性エポキシ樹脂を用いたことを特徴とする請求項
２，３，４，５の内燃機関用点火コイル。6. An ignition coil for an internal combustion engine according to claim 2, wherein a flexible epoxy resin is used for an elastic member between the center core and the secondary bobbin.
３０℃以上の耐熱性を持つゴムを用いたことを特徴とす
る請求項２，３，４，５の内燃機関用点火コイル。7. An elastic member between the center core and the secondary bobbin
The ignition coil for an internal combustion engine according to claim 2, 3, 4, or 5, wherein a rubber having a heat resistance of 30 ° C or higher is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002024907A JP2003229319A (en) | 2002-02-01 | 2002-02-01 | Ignition coil for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002024907A JP2003229319A (en) | 2002-02-01 | 2002-02-01 | Ignition coil for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003229319A true JP2003229319A (en) | 2003-08-15 |
Family
ID=27747215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002024907A Pending JP2003229319A (en) | 2002-02-01 | 2002-02-01 | Ignition coil for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003229319A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003102981A1 (en) * | 2002-06-03 | 2003-12-11 | Denso Corporation | Ignition coil |
| JP2014051926A (en) * | 2012-09-07 | 2014-03-20 | Denso Corp | Ignition coil for internal combustion engine |
| CN103779056A (en) * | 2012-10-22 | 2014-05-07 | 罗伯特·博世有限公司 | Ignition coil with reduced thermal mechanical stress |
-
2002
- 2002-02-01 JP JP2002024907A patent/JP2003229319A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003102981A1 (en) * | 2002-06-03 | 2003-12-11 | Denso Corporation | Ignition coil |
| US6980073B2 (en) | 2002-06-03 | 2005-12-27 | Denso Corporation | Ignition coil with optimized thermal stress relaxing member |
| JP2014051926A (en) * | 2012-09-07 | 2014-03-20 | Denso Corp | Ignition coil for internal combustion engine |
| CN103779056A (en) * | 2012-10-22 | 2014-05-07 | 罗伯特·博世有限公司 | Ignition coil with reduced thermal mechanical stress |
| CN103779056B (en) * | 2012-10-22 | 2018-04-20 | 罗伯特·博世有限公司 | The ignition coil of thermal and mechanical stress with reduction |
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