JP4805008B2 - Double opening ignition coil device - Google Patents

Double opening ignition coil device Download PDF

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JP4805008B2
JP4805008B2 JP2006126414A JP2006126414A JP4805008B2 JP 4805008 B2 JP4805008 B2 JP 4805008B2 JP 2006126414 A JP2006126414 A JP 2006126414A JP 2006126414 A JP2006126414 A JP 2006126414A JP 4805008 B2 JP4805008 B2 JP 4805008B2
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coil
ignition
case
opening
axial direction
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JP2007299919A (en
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勉 長谷川
聖哉 吉田
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Toyo Denso Co Ltd
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Description

本発明は、例えば、自動車のエンジンの点火コイル装置のうち、独立点火方式のエンジンの点火プラグに直結する、小型の点火コイル装置に関する。以下これらのコイルをＰＴＣと表記する。ＰＴＣとはPlug Top Coilの略称である。   The present invention relates to a small ignition coil device that is directly connected to, for example, an ignition plug of an independent ignition type engine among ignition coil devices of an automobile engine. Hereinafter, these coils are referred to as PTC. PTC is an abbreviation for Plug Top Coil.

従来、内燃機関の独立点火方式に採用されるＰＴＣはエンジンのヘッドカバー周辺に取り付けられることから、小型軽量化が望まれ、エンジンのヘッドカバー上部への配置が制限されることから、点火コイルをプラグトップに取り付けたとき点火プラグの軸方向にあたる長さができる限り短くなるように点火コイルを設計する傾向にあった。図８に示す特許文献１のもののようにコイル３，５の軸方向が点火プラグ１８の軸方向と一致する縦型タイプにおいては、プラグホールに直接挿入しているため、エンジンのヘッドカバー上に露出する部分が少なくなり、ヘッドカバー周辺の設計的自由度が向上するといった利点があった。しかし、図８に示すように、コイルの内蔵部品をコイルケースの上部開口端ぎりぎりまで配置しているため、エポキシ樹脂液の注入時に余裕が無く、管理に手間が掛かかり製造効率が低下するといった問題があった。またこれとは別形式の、コイルの軸方向が横になる横型タイプの点火コイル装置が提供されている。因みに特許文献２に提示されているものは図７に示されるように、横型配置をとっているため、この部分の縦寸法は短くなっているが、耐電圧性能を確保するためケース１の上部開口端を高くして絶縁用の樹脂２１面と内蔵部品との距離が十分とれるように設計しているため、トータルの縦寸法はやや高くなっている。これを更に小型化したいという要求に応えるため、軸方向を閉口端とし、軸方向とは直角方向に開口端を設け、軸方向の長さを短くする設計が考えられる。この設計であれば、高圧となる二次コイル部分は絶縁性の高い材料のケーシングでカバーできるので縦型寸法を短くできるが、内蔵する部品を横から挿入するため、組み付け性が悪いといった欠点があった。   Conventionally, the PTC used in the internal ignition system of the internal combustion engine is attached to the periphery of the engine head cover. Therefore, it is desired to reduce the size and weight, and the arrangement on the upper part of the engine head cover is limited. When mounted on the ignition coil, the ignition coil tends to be designed so that the length corresponding to the axial direction of the spark plug is as short as possible. In the vertical type in which the axial direction of the coils 3 and 5 coincides with the axial direction of the spark plug 18 as in the case of Patent Document 1 shown in FIG. There is an advantage that the number of parts to be reduced is reduced, and the degree of design freedom around the head cover is improved. However, as shown in FIG. 8, since the coil built-in components are arranged to the edge of the upper opening of the coil case, there is no allowance when injecting the epoxy resin liquid, and it takes time and effort to manage, resulting in reduced manufacturing efficiency. There was a problem. In addition, a horizontal type ignition coil device in which the axial direction of the coil is horizontal is provided. Incidentally, what is presented in Patent Document 2 has a horizontal arrangement as shown in FIG. 7, so that the vertical dimension of this portion is shortened, but the upper portion of case 1 is secured to ensure withstand voltage performance. Since the opening end is made high so that the distance between the insulating resin 21 surface and the built-in component is sufficient, the total vertical dimension is slightly high. In order to meet this demand for further miniaturization, a design in which the axial direction is a closed end, an open end is provided in a direction perpendicular to the axial direction, and the axial length is shortened can be considered. With this design, the secondary coil part that is at a high voltage can be covered with a casing made of a highly insulating material, so the vertical dimension can be shortened. there were.

ＰＴＣではなく、通信分野で使われる高圧変成器においては図６に示されるようにコイルケースにおいて隣接する二方向面に開口部を設け、この部分からコイル等の部品を組み付けた後一面の開口部を閉塞して一面開口形態とし、その面から熱硬化樹脂を注入して固化させたものも提示（特許文献３参照）されている。コイルケースの隣接する二面が開口した構造であることから、コイル等の内部部品を組み込む点では作業性が高い。しかし、この変成器はコイルの軸線（長手）方向寸法をできるだけ短くしたいといったＰＴＣの要請は全く考慮されていないので、この通信用の変成器の技術をそのままＰＴＣに適用することはできない。
特開平４−６２８１２号公報 「内燃機関用点火コイル」 平成４年２月２７日公開 特開２００２−４８０４６公報 「内燃機関用点火コイル」 平成１４年２月１５日公開 特開昭６２−４９６０８公報 「変成器ケーシング」 昭和６２年３月４日公開 As shown in FIG. 6, in the high voltage transformer used in the communication field instead of PTC, an opening is provided in two adjacent surfaces in the coil case, and a part such as a coil is assembled from this part to the opening on one side. Is also shown in which a single-sided opening is formed and a thermosetting resin is injected and solidified from the surface (see Patent Document 3). Since two adjacent surfaces of the coil case are open, workability is high in that internal parts such as coils are incorporated. However, since this transformer does not consider the requirement of the PTC to reduce the axial (longitudinal) dimension of the coil as much as possible, the technology of the communication transformer cannot be applied to the PTC as it is.
JP-A-4-62812 "Ignition Coil for Internal Combustion Engine" Published on February 27, 1992 JP 2002-48046 A "Ignition Coil for Internal Combustion Engine" Published on February 15, 2002 Japanese Patent Laid-Open No. 62-49608 “Transformer Casing” Published March 4, 1987

本発明の課題は、縦方向寸法をできるだけ短くすると共に、高い耐電圧性と耐水性をもつことに加え、組み付け性において優れたプラグトップ直結型点火コイル装置を提供することにある。   SUMMARY OF THE INVENTION An object of the present invention is to provide a plug-top directly connected ignition coil device that is as short as possible in the longitudinal direction, has high voltage resistance and water resistance, and is excellent in assembly.

本発明の点火コイル装置は、内燃機関のエンジンのプラグトップに直結される点火コイル装置であって、コイルの軸方向が点火プラグの軸方向と直交する方向に配置され、上方開口部とそれに隣接した点火プラグの軸方向と直交する二方向に開口端を有するコイルケースと、前記上方開口は高絶縁材からなる蓋状体で閉塞されることにより、前記コイルケースの点火プラグの軸方向の開口端位置を低くすることができるようにした。
また、本発明に係る点火コイル装置の上記蓋状体はコイルケースとの間でラビリンス構造によって閉塞されると共に、コイル等コイルケースの内部部品はコイルの軸方向開口からの充填樹脂で固定されるようにした。
また、本発明に係る点火コイル装置はプラグ軸方向と直交する方向のコイルケース開口端部にコネクターを配置するようにした。 An ignition coil device according to the present invention is an ignition coil device directly connected to a plug top of an engine of an internal combustion engine, wherein the axial direction of the coil is disposed in a direction perpendicular to the axial direction of the ignition plug, and an upper opening and adjacent thereto. The coil case having an opening end in two directions orthogonal to the axial direction of the spark plug, and the upper opening is closed with a lid-like body made of a highly insulating material, so that the axial opening of the ignition plug of the coil case is closed. The edge position can be lowered .
Further, the lid-like body of the ignition coil device according to the present invention is closed between the coil case and the coil case by a labyrinth structure, and internal components of the coil case such as a coil are fixed with a filling resin from the axial opening of the coil. I did it.
In the ignition coil device according to the present invention, the connector is disposed at the coil case opening end in the direction orthogonal to the plug axis direction.

本発明の点火コイル装置は、コイルの軸方向が点火プラグの軸方向と直交する方向に配置された構造を採用するものであるから、装置の点火プラグの軸方向寸法を小さく抑えることができる。また、隣接する二方向に開口端を有するコイルケースを採用したことにより、コイルやコアといった内部部品をケース内に装填する組み付け作業が楽に行える。更に、コイル等の部品を組み付けた後一方開口は高絶縁材からなる蓋状体で閉塞されるようにしたので、コイル高圧部の絶縁効果が高くなり、該コイルケースの点火プラグの軸方向の開口端位置を低くすることができる。   Since the ignition coil device of the present invention employs a structure in which the axial direction of the coil is arranged in a direction perpendicular to the axial direction of the ignition plug, the axial dimension of the ignition plug of the device can be kept small. Further, by adopting a coil case having open ends in two adjacent directions, an assembling operation for loading internal components such as a coil and a core into the case can be easily performed. Furthermore, after assembling the parts such as the coil, the one opening is closed with a lid-like body made of a high-insulation material, so that the insulation effect of the high-voltage coil portion is increased and the axial direction of the ignition plug of the coil case is increased. The opening end position can be lowered.

また、本発明に係る点火コイル装置の上記蓋状体はコイルケースとの間でラビリンス構造によって閉塞されるので、コイルケースとしての構造が堅固となって樹脂の充填固化の過程において液漏れ等の心配がない。
また、本発明に係る点火コイル装置はプラグ軸方向と直交する方向のコイルケース開口端部にコネクターを配置するようにし、コイル等コイルケースの内部部品はコイルの軸方向開口からの充填樹脂で固定されるようにしたので、外気に触れる充填樹脂面には水が溜まるようなことが無く、防水性が向上する。 Further, since the lid-like body of the ignition coil device according to the present invention is closed with a labyrinth structure between the coil case, the structure as the coil case is solid and liquid leakage or the like occurs in the process of filling and solidifying the resin. There is no worry.
In addition, the ignition coil device according to the present invention has a connector disposed at the coil case opening end in a direction orthogonal to the plug axial direction, and internal components of the coil case such as a coil are fixed with a filling resin from the axial opening of the coil. As a result, water does not accumulate on the surface of the filled resin that comes into contact with the outside air, and waterproofness is improved.

本発明の１実施形態を、図１乃至図３に基づいて説明する。図１は、本発明の点火コイル装置の実施形態の縦断面図で、珪素鋼板が複数枚積層されたＩ字状のセンタコア６がインサート成形された１次ボビン２に、１次巻線３が巻きまわされ、当該１次巻線３を中心として更に同軸状に２次巻線５が巻きまわされた２次ボビン４が配置されている。コイルケース１の低圧側にはコネクタ９が連接され、当該コネクタ９には、点火を制御する点火ユニット１０が配置され、点火ユニットの端子１１とコネクタ９の端子１２は抵抗溶接等によって接続されている。図４の接続回路図に示すように１次巻線３に点火ユニット１０からの入力信号を与えるための接続用端子１１が接続されるが、この接続は図１に示すように２次ボビン４上において点火ユニット１０と抵抗溶接等でなされる。又、２次ボビン４には２次巻線５の巻終わり(高圧側)と接続され、点火プラグ１８側と接続するための２次端子１３が設置されている。(以下、この状態を「コイルコンプ」と表記する。)   An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a longitudinal cross-sectional view of an embodiment of an ignition coil device according to the present invention. A secondary bobbin 4 is disposed in which the secondary winding 5 is wound around the primary winding 3 in a coaxial manner. A connector 9 is connected to the low voltage side of the coil case 1, and an ignition unit 10 for controlling ignition is disposed in the connector 9. A terminal 11 of the ignition unit and a terminal 12 of the connector 9 are connected by resistance welding or the like. Yes. As shown in the connection circuit diagram of FIG. 4, a connection terminal 11 for supplying an input signal from the ignition unit 10 is connected to the primary winding 3, which is connected to the secondary bobbin 4 as shown in FIG. Above, it is made with the ignition unit 10 by resistance welding or the like. The secondary bobbin 4 is provided with a secondary terminal 13 connected to the end of the secondary winding 5 (high voltage side) and connected to the spark plug 18 side. (Hereafter, this state is referred to as “coil comp”.)

コイルケース１と一体に成形された高圧タワー１４の所定位置には二次端子１３と接続する高圧ターミナル１５を圧入ぎみに設置する。また、外周コア１６はコイルケース１内に設置しておく。この時、外周コア１６の幅とコイルケース１の内面幅は管理されたクリアランスを有しているため、外周コア１６の設置後のガタつきはほとんど発生しない。次に、前記コイルコンプをコイルケース１の軸線上方から下方に向って挿入すると、二次端子１３は高圧ターミナル１５と接触し、電気的接続が保たれることとなる。なお、この時、コネクタ９には、コイルケース１の軸線方向とは直角方向の開口部面の所定位置に係合する凹溝が形成されており、当該凹溝と開口部のＵ字状部位が係合して結合される。   A high voltage terminal 15 connected to the secondary terminal 13 is installed in a predetermined position at a predetermined position of the high voltage tower 14 formed integrally with the coil case 1. The outer core 16 is installed in the coil case 1. At this time, since the width of the outer peripheral core 16 and the inner surface width of the coil case 1 have a controlled clearance, the play after the outer peripheral core 16 is installed hardly occurs. Next, when the coil comp is inserted from the upper side of the axis of the coil case 1 downward, the secondary terminal 13 comes into contact with the high voltage terminal 15 and electrical connection is maintained. At this time, the connector 9 is formed with a recessed groove that engages with a predetermined position of the opening surface in a direction perpendicular to the axial direction of the coil case 1, and the U-shaped portion of the recessed groove and the opening portion. Are engaged and coupled.

コイルケース１は上方開口部とそれに隣接した点火プラグの軸方向と直交する方向の２面の開口部が形成されるようにした。これはコイルやコアの内部部材を組み込む際に、楽に装填できるための構成である。また、コイルケース１の上方開口端位置を低くし、高絶縁材料の蓋状体７がこの開口面を覆うようになっている。コイルケース１と蓋状体７にはそれぞれに周縁部に溝部１ａ，７ａが設けられ、互いに噛合うラビリンス構造で組み合わされる。コイル等の内部部材が装填され、図２（上方開口部がまだ蓋状体７で被せられていない状態の本発明点火コイル装置の平面図。）から分かるように、コイルケースの溝部１ａはコイルケース１の上端部周縁開口部を除く３方にＵ字状に設けられている。他方の蓋状体７の溝部７ａもコイルケースの溝部１ａと勘合するようにＵ字状に設けられている。コイルケース１の上方開口部を塞ぐ蓋状体７は図３に示すように開口部に蓋状体７を圧入ぎみに係合させる。この時、蓋状体７とコイルケース１の開口部とはラビリンス構造で係合するようになっている。
係合された状態で、他方の開口面を上方に向けて注型用の樹脂であるエポキシ剤をプラグ軸線とは直角方向、すなわち、コネクタ９側から流し込み固化させて点火コイル装置を得る。なお、この時、蓋状体とコイルケースは前述のように、ラビリンス構造で係合しているため、注型時に絶縁樹脂が漏れることはない。樹脂２１の充填は図５の(１)に示されるように斜線で塗られた部分となる。図５の(２)は図５の(１)のＡ−Ａ部断面であるが、コイルケース１蓋状体７とコネクタ９が結合された状態で開口している注入口から樹脂２１が流し込まれて、固化される。 The coil case 1 has an upper opening and two openings in a direction perpendicular to the axial direction of the spark plug adjacent thereto. This is a configuration that can be easily loaded when incorporating the coil or core internal member. Further, the position of the upper opening end of the coil case 1 is lowered, and a lid-like body 7 made of a high insulating material covers the opening surface. The coil case 1 and the lid-like body 7 are respectively provided with groove portions 1a and 7a at their peripheral portions, and are combined in a labyrinth structure that meshes with each other. As shown in FIG. 2 (a plan view of the ignition coil device of the present invention in a state where the upper opening is not yet covered with the lid 7), the groove 1 a of the coil case is a coil. The case 1 is provided in a U shape in three directions excluding the upper peripheral edge opening. The groove 7a of the other lid-like body 7 is also provided in a U shape so as to be fitted with the groove 1a of the coil case. As shown in FIG. 3, the lid 7 that closes the upper opening of the coil case 1 is engaged with the lid 7 by press fitting. At this time, the lid 7 and the opening of the coil case 1 are engaged in a labyrinth structure.
In an engaged state, the other opening surface is directed upward, and an epoxy agent, which is a resin for casting, is poured in a direction perpendicular to the plug axis, that is, from the connector 9 side, and solidified to obtain an ignition coil device. At this time, since the lid and the coil case are engaged in the labyrinth structure as described above, the insulating resin does not leak during casting. The filling of the resin 21 becomes a portion painted with diagonal lines as shown in (1) of FIG. 5 (2) is a cross-sectional view taken along the line AA of FIG. 5 (1), and the resin 21 is poured from the inlet that is opened in the state where the coil case 1 lid 7 and the connector 9 are joined. And solidified.

また、本発明では蓋状体７が高絶縁性の樹脂で成形されているため、二次コイル５との隙間を可能な限り小さく設定しても、耐電圧性は維持できる。そのため、コイルケース１の点火プラグの軸方向の開口端位置を低くすることができる。点火プラグ１８との接続は、コイルケース１の高圧タワー１４の軸心の高圧ターミナル１５にハイテンションスプリング１９を係合させ、高圧タワー１４の凹凸に合わせるように耐熱ゴム製の高圧ブーツ２０を係合して装着する。この状態で、エンジンカバー上部から点火プラグ１８に点火コイル装置を係合させる。なお、コイルケース１には図示しない取付用腕が突設されており、取付用腕にあけられた取付用孔にビスを通してエンジンカバーと固定する。   Further, in the present invention, since the lid-like body 7 is formed of a highly insulating resin, the withstand voltage can be maintained even if the gap with the secondary coil 5 is set as small as possible. Therefore, the opening end position in the axial direction of the ignition plug of the coil case 1 can be lowered. The spark plug 18 is connected to the high tension spring 19 engaged with the high pressure terminal 15 at the center of the high voltage tower 14 of the coil case 1 and the high pressure boot 20 made of heat-resistant rubber so as to match the unevenness of the high pressure tower 14. Fit together. In this state, the ignition coil device is engaged with the spark plug 18 from the upper part of the engine cover. The coil case 1 is provided with a mounting arm (not shown) and is fixed to the engine cover through a screw in a mounting hole formed in the mounting arm.

点火コイル装置のプラグ軸線方向を低背化する場合、軸線方向の開口端が短くなるため、そのままでは、エポキシ液面管理が難しくなる。この発明では、ラビリンス構造をもった絶縁性樹脂で成形された蓋状体で軸線方向の開口端をふさぎ、軸線とは直角方向からエポキシ注型剤を注入することにより、エポキシ液面管理が容易になる。また、高圧側は絶縁性樹脂で成形された蓋状体で閉塞しているため、耐電圧性は維持される。一方、液面注入部は開口端のままであるが、低電圧側であるため、耐電圧上問題は生じない。
さらに、ラビリンス構造の蓋状体で軸線の上方向(天方向)を覆っているため、エポキシ面に水分や塵埃が溜まることは無く、耐水性能等も向上する。 When the height of the plug axial direction of the ignition coil device is lowered, the opening end in the axial direction becomes shorter, so that it becomes difficult to manage the epoxy liquid level as it is. In this invention, the lid of the insulating resin having a labyrinth structure is used to close the opening end in the axial direction, and the epoxy casting agent is injected from the direction perpendicular to the axial line, thereby making it easy to manage the epoxy liquid level. become. Moreover, since the high voltage | pressure side is obstruct | occluded with the cover body shape | molded with insulating resin, withstand voltage property is maintained. On the other hand, the liquid level injection part remains at the open end, but since it is on the low voltage side, there is no problem withstand voltage.
Furthermore, since the upper direction (top direction) of the axis line is covered with the lid of the labyrinth structure, moisture and dust do not collect on the epoxy surface, and the water resistance performance and the like are improved.

本発明の点火コイル装置の１実施形態の縦断面図である。It is a longitudinal section of one embodiment of an ignition coil device of the present invention. 上方開口部が蓋状体で被せられていない状態の本発明点火コイル装置の平面図である。It is a top view of the ignition coil device of the present invention in a state where the upper opening is not covered with a lid-like body. １実施形態においてコイルケースに蓋状体が被さる形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the form which a cover body covers a coil case in 1 embodiment. 本発明の点火コイル装置の接続回路図である。It is a connection circuit diagram of the ignition coil device of the present invention. 本発明のコイルケース内に樹脂が充填される形態を説明する図である。It is a figure explaining the form with which resin is filled in the coil case of this invention. 変成器ケーシングとその中に滑り込ませるカバーの分解斜視図である。It is an exploded perspective view of a transformer casing and a cover to be slid into the transformer casing. 従来の点火コイル装置の縦断面図である。It is a longitudinal cross-sectional view of the conventional ignition coil apparatus. 従来の異なる点火コイル装置の縦断面図である。It is a longitudinal cross-sectional view of a different conventional ignition coil device.

符号の説明Explanation of symbols

１ コイルケース ２ 一次ボビン
３ 一次巻線 ４ 二次ボビン
５ 二次巻線 ６ センターコア
７ 蓋状体 １ａ,７ａ 溝部
９ コネクタ １０ 点火ユニット
１１ 点火ユニットの端子 １２ コネクタの端子
１３ 二次端子 １４ 高圧タワー
１５ 高圧ターミナル １６ 外周コア
１７ 凹溝 １８ 点火プラグ
１９ スプリング ２０ 高圧ブーツ
２１ 絶縁樹脂 1 Coil Case 2 Primary Bobbin 3 Primary Winding 4 Secondary Bobbin 5 Secondary Winding 6 Center Core 7 Lid 1a, 7a Groove 9 Connector 10 Ignition Unit 11 Ignition Unit Terminal 12 Connector Terminal 13 Secondary Terminal 14 High Voltage Tower 15 High pressure terminal 16 Outer core 17 Groove 18 Spark plug 19 Spring 20 High pressure boot 21 Insulating resin

Claims (4)

内燃機関のエンジンのプラグトップに直結される点火コイル装置であって、コイルの軸方向が点火プラグの軸方向と直交する方向に配置され、上方開口部とそれに隣接した点火プラグの軸方向と直交する二方向に開口端を有するコイルケースと、前記上方開口は高絶縁材からなる蓋状体で閉塞されることにより、前記コイルケースの点火プラグの軸方向の開口端位置を低くすることができることを特徴とする点火コイル装置。 An ignition coil device directly connected to a plug top of an engine of an internal combustion engine, wherein the axial direction of the coil is arranged in a direction orthogonal to the axial direction of the ignition plug, and is orthogonal to the axial direction of the upper opening and the adjacent ignition plug The opening of the coil case in the axial direction of the ignition plug of the coil case can be lowered by closing the coil case having an opening end in two directions and the upper opening being closed by a lid-like body made of a highly insulating material. An ignition coil device characterized by the above. 蓋状体はコイルケースとの間でラビリンス構造によって閉塞されるものである請求項１に記載の点火コイル装置。   The ignition coil device according to claim 1, wherein the lid-like body is closed with a labyrinth structure between the lid case and the coil case. コイル等のコイルケース内部部品はコイルの軸方向開口からの充填樹脂で固定されたものである請求項２に記載の点火コイル装置。   The ignition coil device according to claim 2, wherein a coil case internal component such as a coil is fixed with a filling resin from an axial opening of the coil. プラグ軸方向と直交する方向のコイルケース開口端部にコネクターを配置した請求項１乃至３のいずれかに記載の点火コイル装置。   The ignition coil device according to any one of claims 1 to 3, wherein a connector is disposed at an end of the coil case opening in a direction orthogonal to the plug axis direction.
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JP4658168B2 (en) * 2008-07-15 2011-03-23 三菱電機株式会社 Ignition coil device for internal combustion engine and manufacturing method thereof
JP5294209B2 (en) * 2009-07-30 2013-09-18 日立オートモティブシステムズ阪神株式会社 Ignition coil for internal combustion engine
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JP5557343B2 (en) * 2011-07-25 2014-07-23 ダイヤモンド電機株式会社 Ignition coil for internal combustion engines
JP6094988B2 (en) * 2012-07-19 2017-03-15 ダイヤモンド電機株式会社 Ignition coil for internal combustion engines
JP5991579B2 (en) * 2012-07-19 2016-09-14 ダイヤモンド電機株式会社 Ignition coil for internal combustion engines
JP6094989B2 (en) * 2012-07-19 2017-03-15 ダイヤモンド電機株式会社 Ignition coil for internal combustion engines
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JP5847112B2 (en) * 2013-04-19 2016-01-20 ダイヤモンド電機株式会社 Ignition coil for internal combustion engine
JP2015090871A (en) * 2013-11-05 2015-05-11 ダイヤモンド電機株式会社 Ignition coil for internal combustion engine
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