JP2003124042A - Ignition coil - Google Patents

Ignition coil

Info

Publication number
JP2003124042A
JP2003124042A JP2001318307A JP2001318307A JP2003124042A JP 2003124042 A JP2003124042 A JP 2003124042A JP 2001318307 A JP2001318307 A JP 2001318307A JP 2001318307 A JP2001318307 A JP 2001318307A JP 2003124042 A JP2003124042 A JP 2003124042A
Authority
JP
Japan
Prior art keywords
coil
outer peripheral
central core
ignition coil
spool
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.)
Granted
Application number
JP2001318307A
Other languages
Japanese (ja)
Other versions
JP4032692B2 (en
Inventor
Atsushi Konishi
敦之 小西
Kazutoyo Osuga
一豊 大須賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to JP2001318307A priority Critical patent/JP4032692B2/en
Publication of JP2003124042A publication Critical patent/JP2003124042A/en
Application granted granted Critical
Publication of JP4032692B2 publication Critical patent/JP4032692B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an ignition coil wherein a covering tube is eliminated for the center core. SOLUTION: This ignition coil 1 is provided with a bar-like core body 13 made of magnetic material, a secondary coil 21 wound around the outer circumference of the core body 13, a secondary spool 20 that is arranged between the core body 13 and secondary coil 21 and is wound by the secondary coil 21, a primary coil 24 wound around the outer circumference of the secondary coil 21, a primary spool 23 that is arranged between the secondary coil 21 and the primary coil 24 and is wound by the primary coil 23, and a cylindrical case 11 arranged on the outer circumference side of the primary coil 24. The case 11 is filled with a resin insulation material 26 to mold and fix the secondary and primary coils 21 and 24. A cylindrical member 17 comprised of hard tube is arranged on the outer circumference of the core body 13, and the cylindrical member 17 is projected from the shaft end 13a of the core body 13.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、点火コイルに関
し、特に内燃機関の各気筒のプラグホール内に取付けら
れるいわゆるスティックコイルに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil, and more particularly to a so-called stick coil installed in a plug hole of each cylinder of an internal combustion engine.

【0002】[0002]

【従来の技術】点火コイルとしては、例えば内燃機関用
点火コイルにおいて、各気筒のプラグホール内に取付け
られるいわゆるスティック型の点火コイルが知られてい
る。
2. Description of the Related Art As an ignition coil, for example, an ignition coil for an internal combustion engine is known as a so-called stick type ignition coil which is mounted in a plug hole of each cylinder.

【0003】この種の点火コイルは、プラグホールの筒
軸上に配置される中心コアと、この外周にあって、中心
コアの外周側に巻回される二次コイルと、この二次コイ
ルの外周側に同軸に巻回される一次コイルと、これら点
火コイルを構成する部品を収容するケースとを備える。
このケース内に組付けられる部品間の絶縁性を確保する
ため、樹脂充填材が充填されている。
This type of ignition coil includes a central core arranged on the cylinder axis of a plug hole, a secondary coil located on the outer periphery of the central core and wound around the outer periphery of the central core, and the secondary coil. A primary coil that is coaxially wound around the outer peripheral side and a case that accommodates the components that configure these ignition coils are provided.
In order to ensure the insulation between the parts assembled in this case, a resin filler is filled.

【0004】一般に、点火コイル内すなわちケース内に
配設される点火コイルを構成する各部材は、金属、樹脂
等の異種材料で形成されることで、各部材間の膨張係数
が異なるため、例えば使用環境温度の変化に応じて、膨
張係数差つまり熱膨縮の差に起因した熱応力が樹脂絶縁
材に生じ、樹脂絶縁材に亀裂、割れ等のクラックが発生
する場合がある。このクラックは、樹脂絶縁材に接する
各部材のエッジ部を起点として亀裂が進展し易い。一
方、中心コアは、例えば珪素鋼板を径方向に積層させる
ことで丸棒状に形成されており、エッジ部としては、丸
棒の角部のみならず、丸棒の外周表面を形成する積層さ
れた珪素鋼板の各角部に多数存在する。
Generally, each member constituting the ignition coil arranged in the ignition coil, that is, in the case, is made of a different material such as metal or resin so that the expansion coefficient between the members is different. Depending on the change in the operating environment temperature, thermal stress resulting from the difference in expansion coefficient, that is, the difference in thermal expansion and contraction may occur in the resin insulating material, and cracks such as cracks and breaks may occur in the resin insulating material. The crack is likely to propagate starting from the edge of each member in contact with the resin insulating material. On the other hand, the central core is formed into a round bar shape by laminating, for example, silicon steel plates in the radial direction, and the edge portions are formed to form not only the corner portions of the round bar but also the outer peripheral surface of the round bar. Many are present at each corner of the silicon steel sheet.

【0005】このため、中心コアと充填材との膨張係数
差による上記の熱応力により、充填材にクラックが発生
することがあるので、この熱応力を緩和するため、中心
コアには、軟質の緩衝チューブが被覆されている。
For this reason, cracks may occur in the filler due to the above-mentioned thermal stress due to the difference in expansion coefficient between the central core and the filler. To alleviate this thermal stress, the central core is made of soft material. The buffer tube is covered.

【0006】[0006]

【発明が解決しようとする課題】従来構成では、中心コ
アに被覆チューブを被覆する手間、特に熱収縮させて中
心コアと一体化させる手間が必要なため、製品コストが
増加するという問題がある。
In the conventional structure, it is necessary to cover the central core with the coating tube, particularly, it is necessary to thermally contract the core to integrate the core with the central core.

【0007】本発明は、このような事情を考慮してなさ
れたものであり、したがって、その目的は、中心コアに
被覆チューブを被覆する手間が軽減できる点火コイルを
提供することにある。
The present invention has been made in view of the above circumstances, and therefore an object thereof is to provide an ignition coil which can reduce the labor of coating the central core with the coating tube.

【0008】[0008]

【課題を解決するための手段】本発明の請求項1によれ
ば、磁性材料からなる棒状の中心コアと、中心コアの外
周側に巻かれた内周側コイルと、中心コアと内周側コイ
ルとの間に配され、内周側コイルの巻線が巻回される内
周側スプールと、内周側コイルの外周側に巻かれた外周
側コイルと、内周側コイルと外周側コイルとの間に配さ
れ、外周側コイルの巻線が巻回される外周側スプール
と、外周側コイルの外周側に配される筒状のケースとを
備え、ケース内に樹脂絶縁材が充填されて内周側コイル
および外周側コイルがモールド固定された点火コイルで
あって、中心コアと内周側スプールとの間には、硬質チ
ューブからなる緩衝部材が配置されるとともに、緩衝部
材は、中心コアの軸端部より突出している。
According to claim 1 of the present invention, a rod-shaped central core made of a magnetic material, an inner peripheral coil wound around the outer peripheral side of the central core, a central core and an inner peripheral side. An inner-circumferential-side spool that is arranged between the coil and the inner-circumferential-side coil, and an outer-circumferential-side coil wound around the outer-circumferential-side of the inner-circumferential-side coil; And an outer peripheral spool around which the winding of the outer peripheral coil is wound, and a cylindrical case disposed on the outer peripheral side of the outer peripheral coil. The case is filled with a resin insulating material. Is an ignition coil in which the inner peripheral coil and the outer peripheral coil are molded and fixed, and a buffer member made of a hard tube is arranged between the central core and the inner spool, and It projects from the shaft end of the core.

【0009】中心コアと内周側スプールとの間には、硬
質チューブからなる緩衝部材が配置されているので、例
えば中心コアに形成される複数の積層状の鋼板のエッジ
部を起点としてクラックが発生したとしても、そのクラ
ックが径方向に進展するのを防止できる。さらに、この
緩衝部材は、中心コアの軸端部より突出するように配置
されているので、例えば点火コイルのケース内に充填し
た樹脂絶縁材が中心コアの軸端部の表面に接する場合で
も、中心コアの軸端部より突出する緩衝部材の内部でク
ラックの進展を防止することが可能である。
Since a buffer member made of a hard tube is arranged between the central core and the inner peripheral side spool, for example, cracks start from the edge portions of a plurality of laminated steel plates formed on the central core. Even if it occurs, the crack can be prevented from propagating in the radial direction. Furthermore, since this cushioning member is arranged so as to project from the shaft end of the central core, even when the resin insulating material filled in the case of the ignition coil contacts the surface of the shaft end of the central core, for example, It is possible to prevent the development of cracks inside the buffer member protruding from the axial end portion of the central core.

【0010】しかも、緩衝部材を備えた中心コアにおい
て、緩衝部材を硬質チューブで形成するので、熱収縮チ
ューブ等の軟質チューブのように熱収縮させる手間がな
く、点火コイルの製造上、加工工数が低減できる。
Moreover, in the central core provided with the cushioning member, since the cushioning member is formed of a hard tube, there is no need for heat shrinking like a soft tube such as a heat shrinking tube, and the number of processing steps in manufacturing the ignition coil is reduced. It can be reduced.

【0011】上記緩衝部材は、本発明の請求項2に記載
のように、有底筒状体に形成され、中心コアをこの有底
筒状体の軸方向の中間位置に収容されている。
According to a second aspect of the present invention, the buffer member is formed in a bottomed cylindrical body, and the central core is housed at an axially intermediate position of the bottomed cylindrical body.

【0012】これにより、緩衝部材は、中心コアの外周
側を覆うとともに、中心コアの軸端部の角部ないし軸端
部の表面に形成される複数の鋼板のエッジ部から突出す
るように配置できる。
Thus, the cushioning member is arranged so as to cover the outer peripheral side of the central core and project from the corners of the shaft end of the central core or the edges of a plurality of steel plates formed on the surface of the shaft end. it can.

【0013】また、例えば緩衝部材の内周が中心コアの
外周に密着する構造として、緩衝部材の有底筒状体の開
口部に中心コアを挿入組付けすることで、容易に中心コ
アと緩衝部材を一体形成が可能である。
Further, for example, as a structure in which the inner circumference of the cushioning member is in close contact with the outer circumference of the central core, the central core is inserted and assembled into the opening of the bottomed tubular body of the cushioning member, so that the cushioning can be easily performed with the central core. The members can be integrally formed.

【0014】本発明の請求項3によれば、内周側スプー
ル、または外周側スプールは、緩衝部材の端部を保持す
る底部を備え、底部には、緩衝部材の軸方向内部へ挿入
可能な段差部が形成されている。
According to the third aspect of the present invention, the inner peripheral side spool or the outer peripheral side spool is provided with a bottom portion for holding the end portion of the cushioning member, and the bottom portion can be inserted into the cushioning member axially inside. A step portion is formed.

【0015】これにより、緩衝部材の端部を保持する底
部を内周側スプールまたは外周側スプールが備えている
とともに、緩衝部材の軸方向内部へ挿入可能な段差部が
底部に形成しているので、緩衝部材の内周が中心コアの
外周に密着する構造であるか否かに係わらず、中心コア
を緩衝部材の軸方向内部に配置する、つまり緩衝部材を
中心コアの軸端部より突出させることができる。
Thus, the inner peripheral side spool or the outer peripheral side spool is provided with the bottom portion for holding the end portion of the cushioning member, and the step portion which can be inserted into the cushioning member in the axial direction is formed on the bottom portion. , Regardless of whether or not the inner periphery of the cushioning member is in close contact with the outer periphery of the central core, the central core is arranged inside the axial direction of the cushioning member, that is, the cushioning member is projected from the axial end portion of the central core. be able to.

【0016】本発明の請求項4によれば、中心コアの両
軸端部の少なくともいずれか一方に、緩衝部材より肉厚
の緩衝体を配置している。
According to the fourth aspect of the present invention, a buffer body having a thickness larger than that of the buffer member is disposed on at least one of both axial ends of the central core.

【0017】中心コアの表面に接する樹脂絶縁材にクラ
ックが発生するのは、膨張係数差による熱膨縮が影響す
るため、一般に、棒状に形成される中心コアは、外周側
に比べて、長尺の両軸端部間の熱膨縮の影響が大きい。
The cracks in the resin insulating material in contact with the surface of the central core are affected by thermal expansion and contraction due to the difference in expansion coefficient. Therefore, the central core formed in a rod shape is generally longer than the outer peripheral side. The effect of thermal expansion and contraction between both ends of the shaku is large.

【0018】これに対して、本発明の点火コイルでは、
緩衝部材より肉厚の緩衝体を両軸端部側にそれぞれ設け
る必要はなく、両軸端部の少なくともいずれか一方に設
けるだけで、熱膨縮の影響つまり熱応力の吸収が可能で
ある。
On the other hand, in the ignition coil of the present invention,
It is not necessary to provide a buffer body thicker than the cushioning member on the both shaft end portions side, and it is possible to absorb the influence of thermal expansion and contraction, that is, the thermal stress by providing it on at least one of the both shaft end portions.

【0019】本発明の請求項5によれば、緩衝部材は、
樹脂絶縁材の引張り強度に比較して大きい。
According to claim 5 of the present invention, the cushioning member comprises:
Greater than the tensile strength of resin insulation.

【0020】すなわち、膨張係数差による熱膨縮の影響
で樹脂絶縁材にクラックが生じたとしても、緩衝部材
は、機械的強度としての引張り強度が樹脂絶縁材に比べ
て大きいので、亀裂、割れ等のクラックが発生すること
なく、緩衝部材の硬質チューブに起因して弾性変形する
ことで、クラックが生じる応力をその弾性変形で吸収、
または分散可能である。
That is, even if a crack occurs in the resin insulating material due to the effect of thermal expansion and contraction due to the difference in expansion coefficient, the buffer member has a higher tensile strength as a mechanical strength than the resin insulating material, so that cracking or cracking occurs. Without causing cracks such as, by elastically deforming due to the hard tube of the cushioning member, the stress caused by the cracks is absorbed by the elastic deformation,
Or dispersible.

【0021】[0021]

【発明の実施の形態】以下、本発明の点火コイルを内燃
機関用点火コイルに適用して、具体化した実施形態を、
図面に従って説明する。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment in which the ignition coil of the present invention is applied to an ignition coil for an internal combustion engine and is embodied will be described.
It will be described with reference to the drawings.

【0022】図1は、本発明の実施形態の点火コイルの
概略構成を表す縦断面図である。図2は、図1中のII
−IIからみた横断面図である。図3は、図1中の本発
明の要部である中心コアと緩衝部材の回りのIII線内
部分を拡大した部分断面図である。
FIG. 1 is a vertical sectional view showing a schematic structure of an ignition coil according to an embodiment of the present invention. FIG. 2 shows II in FIG.
It is the cross-sectional view seen from -II. FIG. 3 is an enlarged partial cross-sectional view of a portion within a line III around the central core and the cushioning member, which is a main part of the present invention in FIG.

【0023】図1に示すように、点火コイル1は、図示
しないエンジンブロックの上部に気筒毎に形成されたプ
ラグホール内に収容され、点火プラグ(図示せず)と図
1中の下側で電気的に接続している。
As shown in FIG. 1, the ignition coil 1 is housed in a plug hole formed for each cylinder in an upper portion of an engine block (not shown), and an ignition plug (not shown) and a lower portion in FIG. It is electrically connected.

【0024】点火コイル1は、点火コイル1の筒状のケ
ースとして、樹脂材料からなる円筒状のハウジング11
を備えており、このハウジング11内に形成された収容
室11aには、中心コア部12、二次スプール20、二
次コイル21、一次スプール23、一次コイル24、外
周コア25等が収容されている。
The ignition coil 1 has a cylindrical housing 11 made of a resin material as a cylindrical case of the ignition coil 1.
The accommodation chamber 11a formed in the housing 11 accommodates the central core portion 12, the secondary spool 20, the secondary coil 21, the primary spool 23, the primary coil 24, the outer peripheral core 25, and the like. There is.

【0025】なお、このハウジング11は、コネクタ部
30や点火コイル1をエンジンブロックに固定するため
のブラケット部32が一体化された頭部11b、外周コ
ア25の外周を覆って点火コイル本体部(詳しくは、内
周側コイルとしての二次コイル21、外周側コイルとし
ての一次コイル24等が収容される部位)を保護する筒
部11c、および点火プラグに嵌合装着(詳しくは、二
次コイル24の高圧側の巻線が接続される第1高圧ター
ミナル40、この第1高圧ターミナル40と点火プラグ
の端子に接触する導電性材料からなるスプリング42と
を電気的に接続する第2高圧ターミナル41等が収容さ
れる)高圧タワー部11dとを含んで構成されている。
頭部11bと筒部11cと高圧タワー部11dとの接続
部は、圧入嵌合する構造となっており、それぞれ接着剤
等にて接着され、シールされている。
The housing 11 covers the outer periphery of the head portion 11b and the outer peripheral core 25 in which the connector portion 30 and the bracket portion 32 for fixing the ignition coil 1 to the engine block are integrated, and the ignition coil main body portion ( Specifically, the secondary coil 21 as an inner peripheral side coil, the cylindrical portion 11c that protects the primary coil 24 as an outer peripheral side coil, and the like are fitted and attached to the ignition plug (specifically, the secondary coil). A first high-voltage terminal 40 to which the high-voltage side winding of 24 is connected, and a second high-voltage terminal 41 electrically connecting the first high-voltage terminal 40 and a spring 42 made of a conductive material that contacts the terminal of the spark plug. Etc. are housed) and a high-voltage tower section 11d is included.
The connecting portions of the head portion 11b, the tubular portion 11c, and the high-voltage tower portion 11d have a press-fitting structure, and are bonded and sealed with an adhesive or the like.

【0026】ハウジング11の収容室11aに充填され
たエポキシ樹脂26は、点火コイル1内の各部材間に浸
透し、樹脂絶縁材として部材間の電気絶縁を確実なもの
としている。詳しくは、収容室11aには、樹脂絶縁材
としての電気絶縁性を有する注型樹脂(本実施形態で
は、エポキシ系樹脂)26が充填されて両コイル21、
24およびその他の部品がモールド固定されている。な
お、筒部11cと高圧タワー部11dとの接続部には、
外周コア25とハウジング11との間の熱膨縮差による
エポキシ樹脂26の割れを防ぐために、例えば外周コア
25下端に弾性緩衝部材11eを装着している。
The epoxy resin 26 filled in the housing chamber 11a of the housing 11 penetrates between the respective members in the ignition coil 1 and serves as a resin insulating material to ensure the electrical insulation between the members. Specifically, the housing chamber 11a is filled with a casting resin (epoxy resin in the present embodiment) 26 having electrical insulation as a resin insulating material, and both coils 21,
24 and other parts are fixed to the mold. In addition, at the connecting portion between the tubular portion 11c and the high-voltage tower portion 11d,
In order to prevent the epoxy resin 26 from cracking due to the difference in thermal expansion and contraction between the outer peripheral core 25 and the housing 11, for example, an elastic cushioning member 11e is attached to the lower end of the outer peripheral core 25.

【0027】中心コア部12は、コア本体13と、コア
本体13の両軸端に配設された永久磁石(図示せず)と
からなる。なお、本実施形態では、以下永久磁石を備え
ないコア本体13の場合で説明する。本発明の課題を解
決するにあったては、中心コア部12が永久磁石を有す
るか否かにかかわらず、本発明の点火コイル1によって
解決されるものであるので、永久磁石を有する中心コア
部12の詳細説明は省略する。
The central core portion 12 is composed of a core body 13 and permanent magnets (not shown) arranged at both axial ends of the core body 13. In addition, in the present embodiment, the case of the core body 13 having no permanent magnet will be described below. In solving the problems of the present invention, regardless of whether or not the central core portion 12 has a permanent magnet, the problem is solved by the ignition coil 1 of the present invention. Therefore, a central core having a permanent magnet is provided. Detailed description of the unit 12 is omitted.

【0028】コア本体13は、図1および図2に示すよ
うに、磁性材料(本実施形態では、珪素鋼板)からなる
棒状に形成されており、薄い珪素鋼板を横断面がほぼ円
形となるように径方向に積層して組立てられている。
As shown in FIGS. 1 and 2, the core body 13 is formed in a rod shape made of a magnetic material (a silicon steel plate in this embodiment), and a thin silicon steel plate has a substantially circular cross section. Are assembled by stacking in the radial direction.

【0029】また、このコア本体13の外周と二次スプ
ール20の内周との間には、緩衝部材としての樹脂材料
(本実施形態では、ポリエチレンテレフタレート系樹脂
(PET))からなる硬質チューブ製の筒部材17が配
置されている。さらに、外周側に筒部材17を備えた中
心コア部12に、キャップ19が嵌合している。なお、
キャップ19および内周側スプールとしての二次スプー
ル20は、中心コア部12の外周を取り囲むケース部材
を構成している。
Between the outer circumference of the core body 13 and the inner circumference of the secondary spool 20, a hard tube made of a resin material (polyethylene terephthalate resin (PET) in this embodiment) is used as a buffer member. The tubular member 17 of is arranged. Further, the cap 19 is fitted to the central core portion 12 having the tubular member 17 on the outer peripheral side. In addition,
The cap 19 and the secondary spool 20 as the inner peripheral side spool form a case member that surrounds the outer periphery of the central core portion 12.

【0030】なお、筒部材17の詳細については、後述
する。
The details of the tubular member 17 will be described later.

【0031】二次コイル(内周側コイル)21は、中心
コア部12の外周側(詳しくは、コア本体13の外周側
に配された筒部材17の外周側)に配置され、二次コイ
ル21の高圧側の巻線が点火プラグに電気的に接続する
とともに、この二次コイル21の外側には、二次コイル
21に発生する高電圧を制御するイグナイタ60からの
制御信号が入力される一次コイル(外周側コイル)24
が配置されている。
The secondary coil (inner peripheral coil) 21 is arranged on the outer peripheral side of the central core portion 12 (specifically, the outer peripheral side of the cylindrical member 17 disposed on the outer peripheral side of the core body 13), and the secondary coil The winding on the high voltage side of 21 is electrically connected to the spark plug, and the control signal from the igniter 60 for controlling the high voltage generated in the secondary coil 21 is input to the outside of the secondary coil 21. Primary coil (outer peripheral side coil) 24
Are arranged.

【0032】なお、点火コイルでは、一次コイル24に
入力された電圧を昇圧して二次コイル21から出力する
ものであるので、二次コイル21の巻数は、一次コイル
24の巻数より多く、従って、二次コイル21の巻線の
線径を、一次コイル24の巻線より小さくしている。
In the ignition coil, the voltage input to the primary coil 24 is boosted and output from the secondary coil 21, so that the number of turns of the secondary coil 21 is larger than that of the primary coil 24. The wire diameter of the winding of the secondary coil 21 is smaller than that of the winding of the primary coil 24.

【0033】二次スプール(内周側スプール)20は、
図1および図2に示すように、筒部材17の外周側に配
設されており、中心コア部12、筒部材17の端部を保
持する底部20aを備えた有底筒状に樹脂(本実施形態
では、PPE樹脂)等の電気絶縁材料で形成されてい
る。二次コイル21は二次スプール20の外周に巻回さ
れており、二次コイル21の高電圧側にはさらにダミー
コイル22が一重巻き程度に巻回されている。ダミーコ
イル22は二次コイル21と第1高圧ターミナル40と
を電気的に接続している。二次コイル21の高圧側の巻
線を単線ではなく、ダミーコイル22で二次コイル21
と第1高圧ターミナル40とを電気的に接続することに
より、二次コイル21と第1高圧ターミナル40との電
気的に接続部の表面積を大きくし、電気的接続部への電
界集中を避けている。
The secondary spool (inner side spool) 20 is
As shown in FIG. 1 and FIG. 2, a resin having a bottomed tubular shape is provided on the outer peripheral side of the tubular member 17 and is provided with a central core portion 12 and a bottom portion 20a for holding the end portion of the tubular member 17. In the embodiment, it is formed of an electrically insulating material such as PPE resin). The secondary coil 21 is wound around the outer periphery of the secondary spool 20, and a dummy coil 22 is further wound around the high voltage side of the secondary coil 21 in a single turn. The dummy coil 22 electrically connects the secondary coil 21 and the first high voltage terminal 40. The coil on the high voltage side of the secondary coil 21 is not a single wire, but a dummy coil 22
And the first high-voltage terminal 40 are electrically connected, the surface area of the electrically connecting portion between the secondary coil 21 and the first high-voltage terminal 40 is increased, and electric field concentration on the electrically connecting portion is avoided. There is.

【0034】なお、二次コイル21は、図1および図3
に示すように、高電圧側に向かうほど、コイルの厚み
(コイルの巻き段数)が減少するように巻かれている。
The secondary coil 21 has a structure similar to that shown in FIGS.
As shown in, the coil is wound such that the thickness of the coil (the number of coil winding steps) decreases toward the higher voltage side.

【0035】なお、二次コイル21が巻回される二次ス
プール20の底部20aの詳細、特に、中心コア部12
および筒部材17の端部を保持する構造については、後
述する。
Details of the bottom portion 20a of the secondary spool 20 around which the secondary coil 21 is wound, particularly, the central core portion 12
The structure for holding the end of the tubular member 17 will be described later.

【0036】一次スプール(外周側スプール)23は、
図1および図2に示すように、二次コイル21の外周側
に配設されており、樹脂(本実施形態では、PPE樹
脂)等の電気絶縁材料で略円筒状に形成されている。一
次コイル24は一次スプール23の外周に巻回されてい
る。
The primary spool (outer peripheral side spool) 23 is
As shown in FIGS. 1 and 2, the secondary coil 21 is arranged on the outer peripheral side and is formed in an approximately cylindrical shape with an electrically insulating material such as resin (PPE resin in the present embodiment). The primary coil 24 is wound around the outer circumference of the primary spool 23.

【0037】なお、一次スプール23の外周面(一次コ
イル24と一次スプール23の間)には、樹脂(本実施
形態では、PET)からなる薄膜フィルム23aが巻か
れていていてもよい。この薄膜フィルム23aにより、
一次スプール23と、モールド用樹脂としての樹脂絶縁
材26とが完全に接着してしまうことを防止する。
A thin film 23a made of resin (PET in this embodiment) may be wound on the outer peripheral surface of the primary spool 23 (between the primary coil 24 and the primary spool 23). With this thin film 23a,
The primary spool 23 and the resin insulating material 26 as the molding resin are prevented from completely adhering.

【0038】外周コア25は一次コイル24のさらに外
側に装着され、薄い珪素鋼板等の磁性材料で略円筒状に
形成されている。
The outer peripheral core 25 is mounted on the outer side of the primary coil 24 and is formed of a magnetic material such as a thin silicon steel plate into a substantially cylindrical shape.

【0039】また、第1高圧ターミナル40の中央部
は、第2高圧ターミナル41を挿入する方向に折り曲げ
られた爪部を構成している。この爪部に第2高圧ターミ
ナル41の先端が挿入することにより、第2高圧ターミ
ナル41は第1高圧ターミナル40と電気的に接続して
いる。ダミーコイル22の高電圧端の巻線は、フュージ
ングまたははんだ付け等で、第1ターミナル40に電気
的に接続されている。スプリング42は、第2高圧ター
ミナル41と電気的に接続するとともに、プラグホール
に点火コイル1を挿入した際に点火プラグと電気的に接
続する。ハウジング11の高電圧側開口端には、ゴムか
らなるプラグキャップ43が装着されており、このプラ
グキャップ43に点火プラグを挿入する。
Further, the central portion of the first high voltage terminal 40 constitutes a claw portion bent in the direction of inserting the second high voltage terminal 41. The second high voltage terminal 41 is electrically connected to the first high voltage terminal 40 by inserting the tip of the second high voltage terminal 41 into the claw portion. The high voltage end winding of the dummy coil 22 is electrically connected to the first terminal 40 by fusing, soldering, or the like. The spring 42 is electrically connected to the second high voltage terminal 41 and also electrically connected to the ignition plug when the ignition coil 1 is inserted into the plug hole. A plug cap 43 made of rubber is attached to the open end of the housing 11 on the high voltage side, and an ignition plug is inserted into the plug cap 43.

【0040】なお、コネクタ30には、ターミナル31
がインサート成形されており、このターミナル31は、
スイッチング回路としてのイグナイタ60から一次コイ
ル24へ制御信号を供給するように、一次コイル24の
巻線端部に電気的に接続される。
The connector 30 has a terminal 31
Is insert molded, and this terminal 31
An igniter 60 as a switching circuit is electrically connected to a winding end of the primary coil 24 so as to supply a control signal to the primary coil 24.

【0041】なお、イグナイタ60は、図1に示すよう
に、点火コイル1(詳しくは、頭部11b)に収容され
て、ターミナル31を介して外部からイグナイタ60へ
給電されるものであってもよいし、一次コイル24へ制
御信号を供給するイグナイタ60を点火コイル1の外部
に設けて、ターミナル31を介して制御信号を一次コイ
ル24へ供給してもよい。
The igniter 60 may be housed in the ignition coil 1 (specifically, the head portion 11b) as shown in FIG. 1 and supplied to the igniter 60 from the outside via the terminal 31. Alternatively, an igniter 60 for supplying a control signal to the primary coil 24 may be provided outside the ignition coil 1 and a control signal may be supplied to the primary coil 24 via the terminal 31.

【0042】上述の構成を有する点火コイル1は、コネ
クタ部30のターミナル31を介して、イグナイタ60
から出力される制御信号が一次コイル24へ供給される
と、一次コイル24に入力された電圧に応じて二次コイ
ル21に高電圧が発生する。この高電圧がダミーコイル
22、第1ターミナル40、第2高圧ターミナル41、
スプリング42を介して点火プラグに印加される。
The ignition coil 1 having the above-mentioned structure is provided with the igniter 60 via the terminal 31 of the connector section 30.
When the control signal output from the primary coil 24 is supplied to the primary coil 24, a high voltage is generated in the secondary coil 21 according to the voltage input to the primary coil 24. This high voltage causes the dummy coil 22, the first terminal 40, the second high voltage terminal 41,
It is applied to the spark plug through the spring 42.

【0043】一方、点火コイル1内すなわちハウジング
11内に配設される点火コイルを構成する各部材は、金
属、樹脂等の異種材料で形成されることで、各部材間の
膨張係数が異なるため、例えば使用環境温度の変化に応
じて、膨張係数差つまり温度変化による膨張および収
縮、すなわち熱膨縮の差に起因した熱応力が各部材間に
生じる。熱応力が発生すると、金属材料に比べて、引張
り強度等の機械的強度が低い樹脂材料で形成される一次
および二次スプール21、24や樹脂モールド用の樹脂
絶縁材26のうち、特に樹脂絶縁材26に亀裂、割れ等
のクラックが発生する場合がある。
On the other hand, since the members constituting the ignition coil arranged in the ignition coil 1, that is, the housing 11, are made of different materials such as metal and resin, the expansion coefficient between the members is different. For example, in accordance with a change in the operating environment temperature, a thermal stress due to a difference in expansion coefficient, that is, expansion and contraction due to a temperature change, that is, a difference in thermal expansion and contraction occurs between the members. When thermal stress is generated, the primary and secondary spools 21 and 24 formed of a resin material having a lower mechanical strength such as tensile strength than the metal material and the resin insulating material 26 for resin molding, particularly resin insulation A crack such as a crack or a break may occur in the material 26.

【0044】詳しくは、例えばエポキシ樹脂の樹脂絶縁
材26、コア本体13の外周を取り囲むPPE樹脂の二
次スプール21の膨張係数は、珪素鋼板のコア本体13
の膨張係数に比べて大きい。このため、樹脂絶縁材26
が中心コア部12のコア本体13に直接接している場
合、コア本体13と樹脂絶縁材26とが熱膨縮を繰返す
と、コア本体13と接する樹脂絶縁材26にクラックが
発生することがある。
Specifically, for example, the expansion coefficient of the resin insulating material 26 made of epoxy resin and the secondary spool 21 made of PPE resin surrounding the outer circumference of the core body 13 is determined by the core body 13 made of a silicon steel plate.
Is larger than the expansion coefficient of. Therefore, the resin insulating material 26
When the core body 13 of the central core portion 12 is in direct contact with the core body 13 and the core body 13 and the resin insulating material 26 repeatedly undergo thermal expansion and contraction, cracks may occur in the resin insulating material 26 that is in contact with the core body 13. .

【0045】このクラックは、樹脂絶縁材26に接する
各部材のエッジ部を起点として亀裂が進展し易い。一
方、コア本体13は、珪素鋼板を径方向に積層させるこ
とで丸棒状に形成されており、亀裂すなわちクラックが
進展する起点となるエッジ部が、丸棒状の角部のみなら
ず、丸棒の外周表面を形成する積層された珪素鋼板の各
角部に多数存在する。
The crack is likely to propagate from the edge of each member in contact with the resin insulating material 26 as a starting point. On the other hand, the core main body 13 is formed in a round bar shape by laminating silicon steel plates in the radial direction, and the edge portion which is a crack, that is, the starting point for the crack to propagate is not only a round bar-shaped corner portion but also a round bar shape. A large number are present at each corner of the laminated silicon steel plates forming the outer peripheral surface.

【0046】このため、従来構成では、例えばコア本体
13を、ポリオレフィン系樹脂等からなる軟質チューブ
製の筒部材を、熱収縮させることで一体成形されてい
た。しかしながら、従来の軟質チューブによる筒部材で
は、コア本体13を覆って組立てる際、熱収縮させる手
間が、製造工程上の工数増加となり、製品コスト増とな
る問題がある。
Therefore, in the conventional structure, for example, the core body 13 is integrally formed by heat-shrinking the tubular member made of a soft resin such as a polyolefin resin. However, in the case of the conventional tubular member made of the soft tube, there is a problem that the time and effort required for heat shrinkage when the core body 13 is covered and assembled increases man-hours in the manufacturing process and increases the product cost.

【0047】そこで、本発明の点火コイルの要部である
中心コア部12の回りの構成、特に点火コイル1を構成
する各部品の熱膨張係数の差に起因するコア本体13の
表面のエッジ部に起因して生じる樹脂絶縁材26のクラ
ックの進展を防止する構造について、以下図1および図
3に従って説明する。
Therefore, the edge portion of the surface of the core main body 13 due to the structure around the central core portion 12, which is a main part of the ignition coil of the present invention, and in particular due to the difference in the thermal expansion coefficient of each component forming the ignition coil 1. A structure for preventing the development of cracks in the resin insulating material 26 caused by the above will be described below with reference to FIGS. 1 and 3.

【0048】まず、筒部材は、PETからなる硬質チュ
ーブ製で形成されるとともに、図3に示すように、コア
本体13の外周側に所定間隔を置いてコア本体13を覆
うように、配置されている。さらに、この筒部材13
は、少なくとも丸棒状のコア本体13の角部が筒部材1
3の外部へ露出しないように、コア本体13の軸端部1
3aより突出しているように配置されている。
First, the tubular member is made of a hard tube made of PET, and is arranged so as to cover the core body 13 at a predetermined interval on the outer peripheral side of the core body 13, as shown in FIG. ing. Furthermore, this tubular member 13
Is at least the corner of the round bar-shaped core body 13 is the tubular member 1.
3 so as not to be exposed to the outside of the core body 13.
It is arranged so as to project from 3a.

【0049】これにより、まず、コア本体13の外周
側、かつ二次スプール20の内周側には、硬質チューブ
からなる緩衝部材としての筒部材17が配置されるの
で、例えば点火コイル1のハウジング11内に充填した
樹脂絶縁材26が筒部材17を介してコア本体13の外
周表面13b(図2参照)に接する場合でも、コア本体
13の外周に積層されて形成される複数の鋼板のエッジ
部13bpを起点として樹脂絶縁材26にクラックが発
生したとしても、そのクラックの進展は、筒部材17で
止まり、それ以上にクラックが径方向に進展するのを防
止できる。さらに、この筒部材17は、コア本体13の
軸端部13aより突出するように配置されているので、
例えば点火コイル1のハウジング11内に充填した樹脂
絶縁材26が軸端部13aの表面に接する場合でも、軸
端部13aより突出する筒部材17の内部の範囲内にク
ラックの進展がとどまり、さらに外側にクラックの進展
を防止することが可能である。
As a result, first, the cylindrical member 17 as a cushioning member made of a hard tube is arranged on the outer peripheral side of the core body 13 and the inner peripheral side of the secondary spool 20, so that, for example, the housing of the ignition coil 1 is provided. Even when the resin insulating material 26 filled in 11 contacts the outer peripheral surface 13b (see FIG. 2) of the core body 13 via the tubular member 17, the edges of the plurality of steel plates formed by being laminated on the outer periphery of the core body 13 Even if a crack is generated in the resin insulating material 26 starting from the portion 13 bp, the progress of the crack stops at the tubular member 17, and it is possible to prevent the crack from further extending in the radial direction. Further, since the tubular member 17 is arranged so as to project from the shaft end portion 13a of the core body 13,
For example, even when the resin insulating material 26 filled in the housing 11 of the ignition coil 1 is in contact with the surface of the shaft end portion 13a, the crack progresses within the range of the tubular member 17 protruding from the shaft end portion 13a, It is possible to prevent the development of cracks on the outside.

【0050】しかも、筒部材17を備えた中心コア部1
2すなわちコア本体13において、筒部材17を硬質チ
ューブで形成するので、ポリオレフィン系等の熱収縮可
能な軟質チューブのように、熱収縮させる手間がなく、
点火コイル1の製造上、加工工数が低減できる。
Moreover, the central core portion 1 provided with the tubular member 17
2, that is, in the core body 13, since the tubular member 17 is formed of a hard tube, there is no need for heat shrinking like a soft tube that can be heat shrunk, such as a polyolefin type,
In manufacturing the ignition coil 1, the number of processing steps can be reduced.

【0051】なお、コア本体13を筒部材17の内部に
配置する構成として、図3に示すように、二次コイル2
1を巻回する二次スプール20の底部20aの形状を以
下のようにすることで、点火コイル1の組付け、特に二
次スプール20の底部20aにコア本体13および筒部
材17の端部を保持させる組付けが容易にできる。
As shown in FIG. 3, the secondary coil 2 has a structure in which the core body 13 is arranged inside the tubular member 17.
By setting the shape of the bottom portion 20a of the secondary spool 20 around which the coil 1 is wound as follows, the assembly of the ignition coil 1 is performed, and in particular, the end portions of the core body 13 and the tubular member 17 are attached to the bottom portion 20a of the secondary spool 20. It can be easily held and assembled.

【0052】すなわち、底部20aには、図3に示すよ
うに、筒部材17の軸方向の内部へ挿入可能な段差部2
0ahが形成されている。これにより、筒部材17の内
周がコア本体13の外周に密着する構造であるか否かに
係わらず、コア本体13を筒部材17の軸方向の内部に
配置することができる。
That is, as shown in FIG. 3, the bottom portion 20a has a step portion 2 which can be inserted into the axial direction of the tubular member 17.
0ah is formed. Accordingly, the core body 13 can be arranged inside the tubular member 17 in the axial direction regardless of whether or not the inner periphery of the tubular member 17 is in close contact with the outer periphery of the core body 13.

【0053】なお、この段差部20ahの形状は、図3
に示すように、第1高圧ターミナルの中央部に形成され
る爪部に、第2高圧ターミナル41を挿入して電気的に
接続する構成上から、底部20aの中央部に形成される
挿入孔20bと略同軸の内周を有するように形成するこ
とが望ましい。これにより、プラグホール内に収容され
る点火コイル1において、点火コイル1を構成する各部
材を保護するハウジング11に対して、長尺化および薄
肉化を図る場合に、ハウジング11を軸方向に容易に形
成できる等の樹脂成形性の容易化が図れる。
The shape of the step portion 20ah is shown in FIG.
As shown in FIG. 2, the insertion hole 20b formed in the central portion of the bottom portion 20a has a structure in which the second high-voltage terminal 41 is inserted and electrically connected to the claw portion formed in the central portion of the first high-voltage terminal. It is desirable to form it so as to have an inner circumference substantially coaxial with. As a result, in the ignition coil 1 housed in the plug hole, when the housing 11 that protects each member that constitutes the ignition coil 1 is made longer and thinner, the housing 11 can be easily moved in the axial direction. It is possible to facilitate the resin moldability such that the resin can be formed.

【0054】なお、本実施形態で説明する筒部材17
は、その引張り強度が樹脂絶縁材26び引張り強度に比
べて大きい樹脂材料を使用している。これにより、膨張
係数差による熱膨縮の影響で樹脂絶縁材26にクラック
が生じたとしても、筒部材17は、機械的強度としての
引張り強度が樹脂絶縁材26に比べて大きいので、亀
裂、割れ等のクラックが発生することなく、筒部材の硬
質チューブの機械的強度に起因した弾性変形を継続する
ことで、その弾性変形の変形量に応じて、クラックが生
じる応力の吸収、または分散が可能である。
The cylindrical member 17 described in the present embodiment.
Uses a resin material whose tensile strength is higher than that of the resin insulating material 26 and tensile strength. As a result, even if a crack occurs in the resin insulating material 26 due to the effect of thermal expansion and contraction due to the difference in expansion coefficient, the tubular member 17 has a higher tensile strength as mechanical strength than the resin insulating material 26, so that a crack, Without causing cracks such as cracks, by continuing elastic deformation due to the mechanical strength of the hard tube of the tubular member, depending on the amount of deformation of the elastic deformation, absorption of stress causing cracks, or dispersion It is possible.

【0055】(変形例)第1の変形例としては、上述の
実施形態で説明した筒部材17の筒状体の形状に代え
て、図4に示す有底筒状体の形状を有する筒部材17を
備えた点火コイル1としてもよい。図4は、第1の変形
例の緩衝部材としての筒部材を表わす縦断面図である。
(Modification) As a first modification, instead of the shape of the cylindrical body of the cylindrical member 17 described in the above embodiment, a cylindrical member having the shape of a bottomed cylindrical body shown in FIG. 4 is used. The ignition coil 1 may be provided with 17. FIG. 4 is a vertical cross-sectional view showing a tubular member as a cushioning member of the first modified example.

【0056】図4に示すように、筒部材17は、円筒部
17aと、この円筒部17aの両端のうち、一方端に形
成される環状部17bと、他方端に形成される開口部1
7cからなる。この開口部17cは、上述の実施形態で
説明した二次スプール20の底部20aに形成される段
差部20ahに挿入されるように、形成されるものであ
って、筒部材17は、図4に示す天地方向に筒部材17
を配置した状態で、図1に示すような点火コイル1内に
収容されるように、配置されるものである。
As shown in FIG. 4, the tubular member 17 includes a cylindrical portion 17a, an annular portion 17b formed at one end of the cylindrical portion 17a, and an opening 1 formed at the other end.
It consists of 7c. The opening portion 17c is formed so as to be inserted into the step portion 20ah formed on the bottom portion 20a of the secondary spool 20 described in the above embodiment, and the tubular member 17 is shown in FIG. Cylindrical member 17 in the vertical direction shown
Is arranged so that it is housed in the ignition coil 1 as shown in FIG.

【0057】これにより、筒部材17は、コア本体13
の外周面13b側を覆うとともに、コア本体13の軸端
部13aの角部ないし軸端部の表面に形成される複数の
鋼板のエッジ部から突出するように配置できる。
As a result, the tubular member 17 is fixed to the core body 13
It can be arranged so as to cover the outer peripheral surface 13b side and project from the corners of the shaft end 13a of the core body 13 or the edge portions of the plurality of steel plates formed on the surface of the shaft end.

【0058】また、例えば筒部材17の内周をコア本体
13の外周に密着する構造として、筒部材17の開口部
17cからコア本体13を挿入組付けすることで、容易
にコア本体13と筒部材17を一体形成ができる。
Further, for example, as a structure in which the inner circumference of the tubular member 17 is in close contact with the outer circumference of the core body 13, the core body 13 is inserted and assembled from the opening 17c of the tubular member 17, so that the core body 13 and the tubular body can be easily assembled. The member 17 can be integrally formed.

【0059】また、第2の変形例としては、コア本体1
3の両端部13aの少なくともいずれか一方に、筒部材
17より肉厚の緩衝体17d(本実施形態では、例えば
ゴム材、あるいは単孔質スポンジ)を配置してもよい
(図5参照)。なお、この緩衝体17dは、第1変形例
で説明した有底筒状体の環状部17b(図4参照)の肉
厚を増大させて形成してもよい。
As a second modification, the core body 1
A buffer 17d (e.g., a rubber material or a single-pore sponge in the present embodiment) having a wall thickness thicker than that of the tubular member 17 may be arranged on at least one of both ends 13a of 3 (see FIG. 5). The buffer 17d may be formed by increasing the wall thickness of the annular portion 17b (see FIG. 4) of the bottomed tubular body described in the first modification.

【0060】従来構造のように、筒部材17(詳しくは
円筒部17a)より肉厚の緩衝体17dを両軸端部13
a側にそれぞれ設ける必要はなく、両軸端部13aの少
なくともいずれか一方に設けるだけで、熱膨縮の影響つ
まり熱応力の吸収が可能である。
As in the conventional structure, the cushioning member 17d having a wall thickness thicker than that of the tubular member 17 (specifically, the cylindrical portion 17a) is provided at both shaft end portions 13.
It is not necessary to provide each on the a side, and it is possible to absorb the influence of thermal expansion and contraction, that is, the thermal stress by merely providing it on at least one of both shaft end portions 13a.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施形態の点火コイルの概略構成を表
す縦断面図である。
FIG. 1 is a vertical sectional view showing a schematic configuration of an ignition coil according to an embodiment of the present invention.

【図2】図1中のII−IIからみた横断面図である。FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

【図3】図1中の本発明の要部である中心コアと緩衝部
材の回りのIII線内部分を拡大した部分断面図であ
る。
FIG. 3 is an enlarged partial cross-sectional view of a portion within a line III around a central core and a cushioning member, which are main parts of the present invention in FIG.

【図4】第1の変形例の緩衝部材を表わす縦断面図であ
る。
FIG. 4 is a vertical cross-sectional view showing a cushioning member of a first modified example.

【図5】第2の変形例の点火コイルの構成を表わす縦断
面図である。
FIG. 5 is a vertical sectional view showing a configuration of an ignition coil according to a second modification.

【符号の説明】[Explanation of symbols]

1 点火コイル 11 ハウジング(ケース) 12 中心コア部 13 コア本体 13a 軸端部 13b、13bp 外周面、エッジ部(径方向に積層さ
れて棒状に形成された珪素鋼板の角部) 17 筒部材(緩衝部材) 17a 円筒部 17b 環状部 17c 開口部 17d 緩衝体 19 キャップ 20 二次スプール(内周側スプール) 20a 底部 20ah 段差部 21 二次コイル(内周側コイル) 23 一次スプール(外周側スプール) 24 二次コイル(内周側コイル) 25 外周コア 26 エポキシ樹脂(樹脂絶縁材)
DESCRIPTION OF SYMBOLS 1 Ignition coil 11 Housing (case) 12 Central core part 13 Core body 13a Shaft end parts 13b, 13bp Outer peripheral surface, edge part (corner part of silicon steel plates formed in rod shape by laminating in radial direction) 17 Cylindrical member (cushioning) Member 17a Cylindrical portion 17b Annular portion 17c Opening 17d Buffer 19 Cap 20 Secondary spool (inner circumferential spool) 20a Bottom 20ah Step portion 21 Secondary coil (inner circumferential coil) 23 Primary spool (outer circumferential spool) 24 Secondary coil (inner side coil) 25 Outer core 26 Epoxy resin (resin insulation material)

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 磁性材料からなる棒状の中心コアと、 該中心コアの外周側に巻かれた内周側コイルと、 前記中心コアと前記内周側コイルとの間に配され、前記
内周側コイルの巻線が巻回される内周側スプールと、 前記内周側コイルの外周側に巻かれた外周側コイルと、 前記内周側コイルと前記外周側コイルとの間に配され、
前記外周側コイルの巻線が巻回される外周側スプール
と、 前記外周側コイルの外周側に配される筒状のケースとを
備え、 前記ケース内に樹脂絶縁材が充填されて前記内周側コイ
ルおよび前記外周側コイルがモールド固定された点火コ
イルであって、 前記中心コアと前記内周側スプールとの間には、硬質チ
ューブからなる緩衝部材が配置されるとともに、該緩衝
部材は、前記中心コアの軸端部より突出していることを
特徴とする点火コイル。
1. A rod-shaped central core made of a magnetic material, an inner peripheral side coil wound around the outer peripheral side of the central core, and an inner peripheral side provided between the central core and the inner peripheral side coil. An inner peripheral spool around which the winding of the side coil is wound, an outer peripheral coil wound on the outer peripheral side of the inner peripheral coil, and arranged between the inner peripheral coil and the outer peripheral coil,
An outer peripheral spool around which the winding of the outer peripheral coil is wound, and a cylindrical case arranged on the outer peripheral side of the outer peripheral coil are provided, and the case is filled with a resin insulating material to form the inner periphery. An ignition coil in which the side coil and the outer peripheral side coil are fixed in a mold, and a cushioning member made of a hard tube is arranged between the central core and the inner peripheral side spool, and the cushioning member is An ignition coil projecting from an axial end portion of the central core.
【請求項2】 前記緩衝部材は、有底筒状体に形成さ
れ、前記中心コアを前記有底筒状体の軸方向の中間位置
に収容されていることを特徴とする請求項1に記載の点
火コイル。
2. The cushioning member is formed in a bottomed tubular body, and the central core is housed at an axially intermediate position of the bottomed tubular body. Ignition coil.
【請求項3】 前記内周側スプール、または前記外周側
スプールは、前記緩衝部材の端部を保持する底部を備
え、 前記底部には、前記緩衝部材の軸方向内部へ挿入可能な
段差部が形成されていることを特徴とする請求項1また
は請求項2に記載の点火コイル。
3. The inner circumference side spool or the outer circumference side spool includes a bottom portion that holds an end portion of the cushioning member, and the bottom portion has a step portion that can be inserted into the cushioning member in the axial direction. It is formed, The ignition coil of Claim 1 or Claim 2 characterized by the above-mentioned.
【請求項4】 前記中心コアの両軸端部の少なくともい
ずれか一方に、前記緩衝部材より肉厚の緩衝体を配置し
ていることを特徴とする請求項1から請求項3のいずれ
か一項に記載の点火コイル。
4. A cushioning body having a thickness larger than that of the cushioning member is disposed on at least one of both axial end portions of the central core. Ignition coil according to item.
【請求項5】 前記緩衝部材は、前記樹脂絶縁材の引張
り強度に比較して大きいことを特徴とする請求項1から
請求項4のいずれか一項に記載の点火コイル。
5. The ignition coil according to claim 1, wherein the cushioning member is larger than the tensile strength of the resin insulating material.
JP2001318307A 2001-10-16 2001-10-16 Ignition coil Expired - Lifetime JP4032692B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001318307A JP4032692B2 (en) 2001-10-16 2001-10-16 Ignition coil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001318307A JP4032692B2 (en) 2001-10-16 2001-10-16 Ignition coil

Publications (2)

Publication Number Publication Date
JP2003124042A true JP2003124042A (en) 2003-04-25
JP4032692B2 JP4032692B2 (en) 2008-01-16

Family

ID=19136031

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP4032692B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007053308A (en) * 2005-08-19 2007-03-01 Denso Corp Ignition coil and method of manufacturing same
JP2009535828A (en) * 2006-05-02 2009-10-01 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Ignition coil, especially for automotive internal combustion engines
JP2012049540A (en) * 2010-08-24 2012-03-08 Rolls Royce Plc Electromagnet device
KR101166391B1 (en) 2010-05-06 2012-07-23 주식회사 유라테크 Ignition coil

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007053308A (en) * 2005-08-19 2007-03-01 Denso Corp Ignition coil and method of manufacturing same
JP4591280B2 (en) * 2005-08-19 2010-12-01 株式会社デンソー Ignition coil and manufacturing method thereof
JP2009535828A (en) * 2006-05-02 2009-10-01 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Ignition coil, especially for automotive internal combustion engines
JP4881431B2 (en) * 2006-05-02 2012-02-22 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Ignition coil, especially for automotive internal combustion engines
KR101166391B1 (en) 2010-05-06 2012-07-23 주식회사 유라테크 Ignition coil
JP2012049540A (en) * 2010-08-24 2012-03-08 Rolls Royce Plc Electromagnet device

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