JP4055751B2 - Ignition device for internal combustion engine - Google Patents

Ignition device for internal combustion engine Download PDF

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JP4055751B2
JP4055751B2 JP2004217601A JP2004217601A JP4055751B2 JP 4055751 B2 JP4055751 B2 JP 4055751B2 JP 2004217601 A JP2004217601 A JP 2004217601A JP 2004217601 A JP2004217601 A JP 2004217601A JP 4055751 B2 JP4055751 B2 JP 4055751B2
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center core
internal combustion
combustion engine
ignition device
bobbin
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JP2004312047A (en
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洋一 安蔵
研司 中林
淳一 嶋田
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Hitachi Ltd
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本発明は内燃機関用の点火装置に係り、特にプラグホール内に収納される円筒形点火装置に関する。   The present invention relates to an ignition device for an internal combustion engine, and more particularly to a cylindrical ignition device housed in a plug hole.

従来の内燃機関用点火装置は、特開昭63−70508 号のように、一次ボビンに巻装された一次コイル，二次ボビンに巻装された二次コイル，センタコア等の構成部品が、内側からセンタコア，一次コイル，二次コイル，サイドコアの順に同心状に配置されていた。   A conventional internal combustion engine ignition device includes a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, and a center core as shown in JP-A-63-70508. To the center core, the primary coil, the secondary coil, and the side core in this order.

特開昭６３−７０５０８号JP-A-63-70508

従来技術では、センタコアは、一次コイルの内側に配置され二次コイルの外側にサイドコアが配置されていたため、二次コイルの静電浮遊容量が大きく二次電圧のロスが多かった。又、二次コイルは、センタコア，一次コイルの外側に配置されていたため、二次コイル抵抗が大きくなり二次エネルギーや放電持続時間のロスが多かった。そこで、一次コイル，二次コイル，センタコア，サイドコア等の構成部品を、内側からセンタコア，二次コイル，一次コイル，サイドコアの順に同心状に配置することにより、二次コイルの静電浮遊容量が小さくなり、二次電圧のロスを少なくできる。また、二次コイル抵抗が小さくなることにより、二次エネルギーや放電持続時間のロスが少なくなる。それにより、小形・軽量・高出力な内燃機関用点火装置とすることができる。   In the prior art, since the center core is disposed inside the primary coil and the side core is disposed outside the secondary coil, the electrostatic stray capacitance of the secondary coil is large and the loss of the secondary voltage is large. Further, since the secondary coil is disposed outside the center core and the primary coil, the secondary coil resistance increases, and the secondary energy and the discharge duration time are often lost. Therefore, by arranging the components such as the primary coil, secondary coil, center core, and side core concentrically from the inside in the order of the center core, secondary coil, primary coil, and side core, the electrostatic stray capacitance of the secondary coil is reduced. Thus, the loss of the secondary voltage can be reduced. Further, since the secondary coil resistance is reduced, the loss of secondary energy and discharge duration is reduced. Thereby, it can be set as the ignition device for internal combustion engines of small size, light weight, and high output.

しかし、内側からセンタコア，二次コイルと配置した場合、センタコアと二次コイルの間の電界強度を均一にしないと、部分的に電界集中が起こり絶縁破壊が発生する。   However, when the center core and the secondary coil are arranged from the inside, if the electric field strength between the center core and the secondary coil is not made uniform, electric field concentration partially occurs and dielectric breakdown occurs.

従って、本発明は、小形・高出力化を図りながら、信頼性に優れた内燃機関用点火コイルを提供することを目的とする。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ignition coil for an internal combustion engine that is excellent in reliability while achieving a small size and high output.

上記目的を達成するため、センタコアの二次コイルボビンに対するセンタリングを行う手段としてセンタコアをゴムモールドして二次ボビンに対してセンタリングを行う構造とした。   In order to achieve the above object, the center core is rubber-molded as a means for performing centering of the center core with respect to the secondary coil bobbin, and the centering of the secondary bobbin is performed.

これにより電界強度の均一化を図ることができ、小形で高出力の信頼性に優れた内燃機関用点火コイルが得られる。   As a result, the electric field strength can be made uniform, and an ignition coil for an internal combustion engine having a small size and high output reliability can be obtained.

以下、本発明による実施の形態について、図面を参照し説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は、本発明による一実施例の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 cross-sectional view showing a configuration of an ignition coil for an internal combustion engine according to an embodiment of the present invention.

一次ボビン１は、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ＰＰＯ）等の熱可塑性合成樹脂で形成され、一次コイル２が巻層されている。また、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た二次ボビン３には、二次コイル４が巻層されている。   The primary bobbin 1 is formed of a thermoplastic synthetic resin such as polybutylene terephthalate (PBT) or polyphenylene oxide (modified PPO), and a primary coil 2 is wound thereon. A secondary coil 4 is wound on a secondary bobbin 3 formed of a thermoplastic synthetic resin such as modified polyphenylene oxide (modified PPO) or polyphenylene sulfide (PPS).

なお、具体的に記載すれば、一次コイル２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回程度積層巻されており、二次コイル４は線径０.０３〜０.１mm程度のエナメル線を用いて合計５０００〜
３００００回程度分割して巻かれている。 More specifically, the primary coil 2 is composed of enameled wires having a wire diameter of about 0.3 to 1.0 mm, each of which is a laminated winding of several tens to hundreds of tens of turns, a total of about 100 to 300 turns over several layers. The secondary coil 4 has a total of 5000 to 500 enameled wires having a wire diameter of about 0.03 to 0.1 mm.
It is wound about 30000 times.

センタコア７は、板厚０.２〜０.７mmの珪素鋼板をプレス積層しており、二次ボビン３の内側に挿入される。該センタコア７の断面形状は、円形に近づけた多角形状とし、二次ボビン３の内径に対する占積率を向上させている。   The center core 7 is press-laminated silicon steel plates having a thickness of 0.2 to 0.7 mm, and is inserted inside the secondary bobbin 3. The cross-sectional shape of the center core 7 is a polygonal shape close to a circle, and the space factor with respect to the inner diameter of the secondary bobbin 3 is improved.

該センタコア７と二次ボビン３の間には、可とう性エポキシ樹脂１６，シリコンゴム等の弾性を持つ絶縁材が充填されている。   Between the center core 7 and the secondary bobbin 3, an insulating material having elasticity such as a flexible epoxy resin 16 and silicon rubber is filled.

そして、センタコア７の一端もしくは両端には、一次コイル２で発生する磁束と反対方向の磁束を発生させるマグネット１２を備えている。マグネット１２による磁束は、センタコアにマイナスの磁束を与えるため、コアの磁化曲線の負側から出発して正側まで利用できるため、見かけ上飽和磁束密度の高いコア材料を用いたのと同じ結果となり、コイルの高出力化が期待できる。   A magnet 12 is provided at one or both ends of the center core 7 to generate a magnetic flux in a direction opposite to the magnetic flux generated in the primary coil 2. Since the magnetic flux by the magnet 12 gives a negative magnetic flux to the center core, it can be used from the negative side of the core magnetization curve to the positive side, so that the result is the same as using a core material with an apparently high saturation magnetic flux density. Higher coil output can be expected.

センタコア７あるいはマグネット１２の外側には、ゴムなどの弾性体が設けられており、高圧側の方は、二次ボビン３とマグネット１２の間に、低圧側の方は、マグネット１２と絶縁用エポキシ樹脂６の間に配置されている。これにより、軸方向の熱ひずみを弾性体で吸収する構造としている。このため、弾性体としては、体積が変化できる独立気泡ゴムが適している。   An elastic body such as rubber is provided on the outside of the center core 7 or the magnet 12, and the high pressure side is between the secondary bobbin 3 and the magnet 12, and the low pressure side is the magnet 12 and the insulating epoxy. It is arranged between the resins 6. Thereby, it is set as the structure which absorbs the thermal strain of an axial direction with an elastic body. For this reason, closed cell rubber whose volume can be changed is suitable as the elastic body.

サイドコア８は、板厚０.２〜０.７mmの珪素鋼板を管状に丸めて１〜３枚重ねている。ただし、磁束の１ターンショートを防ぐため、サイドコア８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 8 is formed by rolling 1-3 silicon steel plates having a thickness of 0.2 to 0.7 mm into a tubular shape. However, at least one point on the circumference of the side core 8 is provided with a cut to prevent a short turn of the magnetic flux.

ケース５は一次ボビン１と同じような熱可塑性合成樹脂で成形されており、筒部２５とコネクタ部２４とから構成されている。そのため、別タイプのコネクタが要求された場合は、コネクタ部の変更のみで対応できるようになっており、筒部２５は、共用化を図れるようになっている。   The case 5 is formed of the same thermoplastic synthetic resin as the primary bobbin 1, and includes a cylindrical portion 25 and a connector portion 24. Therefore, when a different type of connector is required, it can be handled only by changing the connector portion, and the cylindrical portion 25 can be shared.

これらの構成部品は、内側からセンタコア７，二次コイル４，一次コイル２，ケース５，サイドコア８の順に、又は、内側からセンタコア７，二次コイル４，一次コイル２，サイドコア８，ケース５の順に同心状に配置している。   These components are the center core 7, secondary coil 4, primary coil 2, case 5, side core 8 in this order from the inside, or center core 7, secondary coil 4, primary coil 2, side core 8, case 5 from the inside. They are arranged concentrically in order.

そして、それらのコイル部構成部品をケース５の中に圧入し、高電圧を絶縁する絶縁用エポキシ樹脂６などの充填絶縁材を充填させる。絶縁用エポキシ樹脂６は、硬化後のガラス転移点温度Ｔｇが１２０℃〜１６２℃で、かつ熱膨張係数が、ガラス転移点温度Ｔｇ以下の温度範囲における平均値として１０〜５０×１０〜６℃ 程度の、例えば、２５×
１０〜6℃ 程度の特性を持つものを用いる。このような高ガラス転移点温度Ｔｇの絶縁用エポキシ樹脂を使用することにより、高温下での電気絶縁特性がいっそう安定する。 Then, those coil part components are press-fitted into the case 5 and filled with a filling insulating material such as an insulating epoxy resin 6 for insulating high voltage. Insulating epoxy resin 6 has a glass transition temperature Tg after curing of 120 ° C. to 162 ° C. and a thermal expansion coefficient of 10 to 50 × 10 to 6 ° C. as an average value in a temperature range of glass transition temperature Tg or less. Degree, for example, 25 ×
Use the one with the characteristic of about 10 ~ 6 ℃. By using such an insulating epoxy resin having a high glass transition temperature Tg, electrical insulation characteristics at a high temperature are further stabilized.

二次コイル４で発生した高電圧は、点火装置の長さを少しでも低減するよう長手方向に対して垂直方向に配置された過早着火防止用高圧ダイオード１７，高圧端子１３，スプリング１４を介して点火プラグ１０に供給される。点火プラグ１０が挿入される部分は、シリコンゴム等のゴムブーツ１５で絶縁する。シリンダヘッドカバー２２と接する部分にはプラグホール１１をシールするシールゴム９が設けられている。コイル上部に設置されるイグナイタユニット２０は、箱型にプレス成形された銅またはアルミ製の金属製ベース
２１に、パワートランジスタチップとハイブリッドＩＣ回路が内蔵されており、金属製ベース２１内にはシリコンゲルが充填されている。 The high voltage generated in the secondary coil 4 passes through a high voltage diode 17 for preventing premature ignition, a high voltage terminal 13 and a spring 14 which are arranged in a direction perpendicular to the longitudinal direction so as to reduce the length of the ignition device as much as possible. And supplied to the spark plug 10. The portion where the spark plug 10 is inserted is insulated by a rubber boot 15 such as silicon rubber. A seal rubber 9 for sealing the plug hole 11 is provided at a portion in contact with the cylinder head cover 22. The igniter unit 20 installed on the upper part of the coil has a power transistor chip and a hybrid IC circuit built in a metal base 21 made of copper or aluminum press-molded into a box shape. The gel is filled.

次に、図２の二次ボビン断面図を用いて本発明の詳細を説明する。   Next, the details of the present invention will be described with reference to the sectional view of the secondary bobbin of FIG.

二次ボビン３の内側には、突起３０が数箇所設けられている。突起３０の先端部はセンタコアとの接触面積を少なくするため半円形状とし、センタコア７と二次ボビン３間に生じる熱ひずみの影響を互いに与えないようにしている。センタコア７を挿入したときの状態は、図３に示すようになり、この場合は、センタコア７の平面部を突起３０で位置決めするようになる。このセンタリング用突起３０の長さは、図４に示すようにセンタコアの長さの１／３以上の長さを二次ボビン３の高圧側から設定する。これによりセンタコア７の傾き防止と二次ボビン３とセンタコア７間の空隙をなくすために充填する可とう性エポキシ樹脂１６の含浸性向上を両立させている。図５は、センタコア７の平面部で位置決めするのではなく、センタコア７の凹み部に突起３０がくるように設定した場合の実施例である。センタコア７の断面形状が円形に近い場合でも、突起３０を二次ボビン３の内側に数箇所設けることでセンタリングが可能となる。図６は、図３に示したセンタリング構造において、センタコア７が斜めに挿入される等の誤挿入を防止するため、突起３０の周囲部（図中斜線部）も樹脂肉を設けている。   Several protrusions 30 are provided inside the secondary bobbin 3. The tip of the protrusion 30 is semicircular in order to reduce the contact area with the center core so that the influence of thermal strain generated between the center core 7 and the secondary bobbin 3 is not given to each other. The state when the center core 7 is inserted is as shown in FIG. 3, and in this case, the flat portion of the center core 7 is positioned by the protrusion 30. As shown in FIG. 4, the centering protrusion 30 is set to have a length of 1/3 or more of the length of the center core from the high pressure side of the secondary bobbin 3. Thus, both the prevention of the tilting of the center core 7 and the improvement of the impregnation property of the flexible epoxy resin 16 filled to eliminate the gap between the secondary bobbin 3 and the center core 7 are achieved. FIG. 5 shows an embodiment in which the projection 30 is set so as to come to the recessed portion of the center core 7 instead of being positioned at the flat portion of the center core 7. Even when the cross-sectional shape of the center core 7 is nearly circular, centering is possible by providing several protrusions 30 inside the secondary bobbin 3. FIG. 6 shows the centering structure shown in FIG. 3 in which the peripheral portion of the protrusion 30 (shaded portion in the figure) is also provided with resin meat in order to prevent erroneous insertion such as the center core 7 being inserted obliquely.

センタリングの別手法として図７に示すようにセンタコア７の一部にテーピング３１を施す方法もある。この場合、センタコア７の上部側にテーピング３１を施してしまうと二次ボビン３とセンタコア７間の空隙をなくすために充填する可とう性エポキシ樹脂１６が上方で遮られ含浸性が悪くなるので、センタコア７の下側のみテーピング３１を巻き付ける。また、テープは可とう性エポキシ樹脂１６が含浸し易いよう不織布テープを用いる。   As another centering method, there is a method of applying a taping 31 to a part of the center core 7 as shown in FIG. In this case, if the taping 31 is applied to the upper side of the center core 7, the flexible epoxy resin 16 to be filled in order to eliminate the gap between the secondary bobbin 3 and the center core 7 is blocked at the upper side, so that the impregnation property is deteriorated. The taping 31 is wound only on the lower side of the center core 7. Moreover, a nonwoven fabric tape is used so that the flexible epoxy resin 16 may be easily impregnated.

さらにセンタリングの別手法としては、図８に示すようにセンタコア７の外周をあらかじめゴムモールド３２しておき、それを二次ボビン３に挿入する方法もある。この方法は、二次ボビン３とセンタコア７間の空隙をなくすために充填する可とう性エポキシ樹脂
１６を注入する工程を省くことができる。そして、モールドするゴム材を導電性にすることで、センタコア７が円柱状になったのと同様になるため、二次コイル４に対する電界が均一になり、絶縁性の向上が期待できる。 Furthermore, as another method of centering, there is a method in which the outer periphery of the center core 7 is preliminarily rubber molded 32 and inserted into the secondary bobbin 3 as shown in FIG. This method can omit the step of injecting the flexible epoxy resin 16 to be filled in order to eliminate the gap between the secondary bobbin 3 and the center core 7. Then, by making the rubber material to be molded conductive, the center core 7 becomes the same as that of the columnar shape, so that the electric field to the secondary coil 4 becomes uniform, and an improvement in insulation can be expected.

従来の内燃機関用点火装置は、特開昭63−70508 号のように、一次ボビンに巻装された一次コイル，二次ボビンに巻装された二次コイル，センタコア等の構成部品が、内側からセンタコア，一次コイル，二次コイル，サイドコアの順に同心状に配置され、特にセンタコアのセンタリング構造は採用されていなかった。   A conventional internal combustion engine ignition device includes a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, and a center core as shown in JP-A-63-70508. The center core, the primary coil, the secondary coil, and the side core are arranged concentrically in this order, and the centering structure of the center core is not particularly employed.

従来技術では、センタコアは、一次コイルの内側に配置され二次コイルの外側にサイドコアが配置されていたため、二次コイルの静電浮遊容量が大きく二次電圧のロスが多かった。又、二次コイルは、センタコア，一次コイルの外側に配置されていたため、二次コイル抵抗が大きくなり二次エネルギーや放電持続時間のロスが多かった。そこで、一次コイル，二次コイル，センタコア，サイドコア等の構成部品を、内側からセンタコア，二次コイル，一次コイル，サイドコアの順に同心状に配置することにより、二次コイルの静電浮遊容量が小さくなり、二次電圧のロスを少なくできる。また、二次コイル抵抗が小さくなることにより、二次エネルギーや放電持続時間のロスが少なくなる。それにより、小形・軽量・高出力な内燃機関用点火装置とすることができる。   In the prior art, since the center core is disposed inside the primary coil and the side core is disposed outside the secondary coil, the electrostatic stray capacitance of the secondary coil is large and the loss of the secondary voltage is large. Further, since the secondary coil is disposed outside the center core and the primary coil, the secondary coil resistance increases, and the secondary energy and the discharge duration time are often lost. Therefore, by arranging the components such as the primary coil, secondary coil, center core, and side core concentrically from the inside in the order of the center core, secondary coil, primary coil, and side core, the electrostatic stray capacitance of the secondary coil is reduced. Thus, the loss of the secondary voltage can be reduced. Further, since the secondary coil resistance is reduced, the loss of secondary energy and discharge duration is reduced. Thereby, it can be set as the ignition device for internal combustion engines of small size, light weight, and high output.

しかし、内側からセンタコア，二次コイルと配置した場合、センタコアと二次コイルの間の電界強度を均一にしないと、部分的に電界集中が起こり絶縁破壊が発生する。   However, when the center core and the secondary coil are arranged from the inside, if the electric field strength between the center core and the secondary coil is not made uniform, electric field concentration partially occurs and dielectric breakdown occurs.

これに対し、上記実施例では、小形・高出力化を図りながら、信頼性に優れた内燃機関用点火コイルを提供できる。   On the other hand, in the above embodiment, it is possible to provide an ignition coil for an internal combustion engine that is excellent in reliability while achieving a small size and high output.

上記実施例ではセンタコアの二次コイルボビンに対するセンタリングを行う位置決め部を設けた。これにより電界強度の均一化を図ることができた。   In the above-described embodiment, the positioning portion that performs centering with respect to the secondary coil bobbin of the center core is provided. As a result, the electric field strength can be made uniform.

実施態様１
点火プラグに直結し、プラグホール内に収納される円筒形点火装置において、一次ボビンに巻装された一次コイル，二次ボビンに巻装された二次コイル，センタコア等の構成部品が、内側からセンタコア，二次コイル，一次コイルの順に同心状に配置され、前記構成部品が熱可塑性合成樹脂で予め成形されたケースに収納されており、かつそのケース内の前記構成部品の周囲には熱硬化性合成樹脂が充填され、さらに一次コイルの外側にサイドコアを配置し、センタコアと二次ボビンの間に絶縁材を充填し、かつセンタコアの両端に弾性体を配置した内燃機関用点火装置において、センタコアを二次コイルに対し、センタリング位置決め部を設けたことを特徴とする内燃機関用点火装置。 Embodiment 1
In the cylindrical ignition device directly connected to the spark plug and housed in the plug hole, components such as the primary coil wound around the primary bobbin, the secondary coil wound around the secondary bobbin, and the center core are A center core, a secondary coil, and a primary coil are arranged concentrically in this order, and the components are housed in a case pre-molded with a thermoplastic synthetic resin, and around the components in the case are thermoset. In an internal combustion engine ignition device, a side core is disposed outside the primary coil, an insulating material is filled between the center core and the secondary bobbin, and an elastic body is disposed at both ends of the center core. An ignition device for an internal combustion engine, wherein a centering positioning portion is provided for the secondary coil.

実施態様２
実施態様１において、センタコアのセンタリングは、二次コイルを巻層，固定する二次ボビンで行うことを特徴とする内燃機関用点火装置。 Embodiment 2
In the first embodiment, the centering of the center core is performed by a secondary bobbin that fixes and winds the secondary coil.

実施態様３
実施態様２において、二次ボビンの内側に突起を数箇所設けることでセンタコアのセンタリングを行うことを特徴とする内燃機関用点火装置。 Embodiment 3
In embodiment 2, the center core is centered by providing several protrusions on the inner side of the secondary bobbin.

実施態様４
実施態様３において、二次ボビンの内側の突起形状は、先端を半円形状とすることを特徴とする内燃機関用点火装置。 Embodiment 4
In the third embodiment, the internal bobbin ignition device is characterized in that the protrusion inside the secondary bobbin has a semicircular tip.

実施態様５
実施態様３において、二次ボビンの内側の突起の長さＬ１は、センタコアの長さＬ２の１／３以上とすることを特徴とする内燃機関用点火装置。 Embodiment 5
In embodiment 3, the length L1 of the projection on the inner side of the secondary bobbin is not less than 1/3 of the length L2 of the center core.

実施態様６
実施態様１において、二次ボビンのセンタリングはセンタコア外周にテープを巻き付けて行うことを特徴とする内燃機関用点火装置。 Embodiment 6
In the first embodiment, the centering of the secondary bobbin is performed by winding a tape around the outer periphery of the center core.

実施態様７
実施態様６において、センタリング用のテープはセンタコアの高圧側のみテープを巻き付けることを特徴とする内燃機関用点火装置。 Embodiment 7
In an embodiment 6, the ignition device for an internal combustion engine, wherein the tape for centering is wound only on the high pressure side of the center core.

実施態様８
実施態様６において、センタリング用のテープは繊維状の不織布テープであることを特徴とする内燃機関用点火装置。 Embodiment 8
In embodiment 6, the ignition device for an internal combustion engine, wherein the centering tape is a fibrous nonwoven fabric tape.

実施態様９
実施態様１において、センタコアをゴムモールドしてセンタリングすることを特徴とする内燃機関用点火装置。 Embodiment 9
The ignition device for an internal combustion engine according to the first embodiment, wherein the center core is rubber-molded and centered.

実施態様１０
実施態様９において、モールドするゴムは導電性ゴムであることを特徴とする内燃機関用点火装置。 Embodiment 10
In embodiment 9, the ignition device for an internal combustion engine, wherein the rubber to be molded is a conductive rubber.

以上の実施例によれば、小形・高出力でかつ信頼性、特に絶縁性能に優れた内熱機関用点火装置を提供することができる。   According to the above embodiment, it is possible to provide an ignition device for an internal heat engine that is small in size, high in output and excellent in reliability, particularly in insulation performance.

本発明の一実施例の内燃機関用点火装置の構成を示す断面図。1 is a cross-sectional view showing a configuration of an internal combustion engine ignition device according to an embodiment of the present invention. 図１の実施例の断面拡大図。The cross-sectional enlarged view of the Example of FIG. 図１の実施例の断面拡大図。The cross-sectional enlarged view of the Example of FIG. 図１の実施例の軸方向の断面拡大図。FIG. 2 is an enlarged sectional view of the embodiment of FIG. 1 in the axial direction. 図２の実施例の突起位置を変えた場合の実施例を示す部分拡大図。The elements on larger scale which show the Example at the time of changing the protrusion position of the Example of FIG. 図１の実施例の断面拡大図。The cross-sectional enlarged view of the Example of FIG. センタリング手法の別実施例図。The another Example figure of a centering method. センタリング手法の別実施例図。The another Example figure of a centering method.

符号の説明Explanation of symbols

１…一次ボビン、２…一次コイル、３…二次ボビン、４…二次コイル、５…ケース、６…絶縁用エポキシ樹脂、７…センタコア、８…サイドコア、９…プラグホールシール、
１０…点火プラグ、１１…プラグホール、１２…マグネット、１３…高圧端子、１４…スプリング、１５…ゴムブーツ、１６…可とう性エポキシ樹脂、１７…過早着火防止用高圧ダイオード、１８…発泡ゴム、１９…空気層、２０…イグナイタユニット、２１…ベース、２２…シリンダヘッドカバー、２４…コネクタ部、２５…筒部、３０…突起、３１…テーピング、３２…ゴムモールド。
DESCRIPTION OF SYMBOLS 1 ... Primary bobbin, 2 ... Primary coil, 3 ... Secondary bobbin, 4 ... Secondary coil, 5 ... Case, 6 ... Insulating epoxy resin, 7 ... Center core, 8 ... Side core, 9 ... Plug hole seal,
DESCRIPTION OF SYMBOLS 10 ... Spark plug, 11 ... Plug hole, 12 ... Magnet, 13 ... High voltage terminal, 14 ... Spring, 15 ... Rubber boot, 16 ... Flexible epoxy resin, 17 ... High pressure diode for preventing premature ignition, 18 ... Foam rubber, DESCRIPTION OF SYMBOLS 19 ... Air layer, 20 ... Igniter unit, 21 ... Base, 22 ... Cylinder head cover, 24 ... Connector part, 25 ... Tube part, 30 ... Projection, 31 ... Taping, 32 ... Rubber mold

Claims (4)

点火プラグ取り付け用のプラグホール内に収納される内燃機関用円筒形点火装置であっ
て、一次ボビンに巻装された一次コイル，二次ボビンに巻装された二次コイル，鋼板を積層したセンタコア等の構成部品が、内側からセンタコア，二次コイル，一次コイルの順に絶縁樹脂で成形されたケースに収納され、前記絶縁樹脂が前記センタコアの周囲に充填され硬化されたものにおいて、
前記センタコアの外周をゴムモールドし、その外周に前記絶縁樹脂が充填され硬化されるよう構成したことを特徴とする内燃機関用円筒形点火装置。
A cylindrical ignition device for an internal combustion engine housed in a plug hole for attaching a spark plug, wherein a primary coil wound around a primary bobbin, a secondary coil wound around a secondary bobbin, and a steel core are laminated In such a case, components such as a center core , a secondary coil, and a primary coil are housed in a case formed of insulating resin in this order from the inside , and the insulating resin is filled and cured around the center core .
A cylindrical ignition device for an internal combustion engine, wherein an outer periphery of the center core is rubber-molded and the outer periphery is filled with the insulating resin and cured .
請求項１に記載の内燃機関用円筒形点火装置において、
センタコアの一端若しくは両端に一次コイルで発生する磁束と反対方向の磁束を発生するマグネットを備えていることを特徴とする内燃機関用円筒形点火装置。 The cylindrical ignition device for an internal combustion engine according to claim 1,
A cylindrical ignition device for an internal combustion engine comprising a magnet that generates a magnetic flux in a direction opposite to a magnetic flux generated by a primary coil at one or both ends of a center core. 請求項２に記載の内燃機関用円筒形点火装置において、
前記センタコアの低圧側の端には前記マグネットの外側に弾性体が設けられていることを特徴とする内燃機関用点火装置。 The cylindrical ignition device for an internal combustion engine according to claim 2,
An ignition device for an internal combustion engine, characterized in that an elastic body is provided outside the magnet at the low-pressure end of the center core. 請求項３に記載の内燃機関用円筒形点火装置において、
前記弾性体の外側に絶縁用エポキシ樹脂が充填されていることを特徴とする内燃機関用点火装置。
The cylindrical ignition device for an internal combustion engine according to claim 3,
An ignition device for an internal combustion engine, characterized in that an insulating epoxy resin is filled outside the elastic body.
JP2004217601A 2004-07-26 2004-07-26 Ignition device for internal combustion engine Expired - Lifetime JP4055751B2 (en)

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JP2006291760A (en) * 2005-04-07 2006-10-26 Hanshin Electric Co Ltd Ignition coil for internal combustion engine
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