JP2000182860A - Ignition coil for internal combustion engine - Google Patents
Ignition coil for internal combustion engineInfo
- Publication number
- JP2000182860A JP2000182860A JP10360211A JP36021198A JP2000182860A JP 2000182860 A JP2000182860 A JP 2000182860A JP 10360211 A JP10360211 A JP 10360211A JP 36021198 A JP36021198 A JP 36021198A JP 2000182860 A JP2000182860 A JP 2000182860A
- Authority
- JP
- Japan
- Prior art keywords
- iron core
- core
- wound
- bobbin
- coil bobbin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば自動車のエ
ンジンの点火プラグにおいて火花放電を発生させるため
に高電圧を供給するモールド型の内燃機関用点火コイル
に関し、特に小型化が要求される内燃機関用点火コイル
の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded type internal combustion engine ignition coil for supplying a high voltage to generate a spark discharge in, for example, a spark plug of an automobile engine, and more particularly to an internal combustion engine which is required to be miniaturized. The present invention relates to an improvement in an ignition coil for a vehicle.
【０００２】[0002]
【従来の技術】本出願人は、先に、磁力線が一次コイル
ボビンの筒内周を通る積層鉄心と二次コイルボビンの外
周を通る巻回鉄心との間に、両鉄心を磁気的に直列に結
合する永久磁石を配設して、小型化に加え高出力化が可
能な内燃機関用点火コイルを特願平１０−１２８３号と
して提案した。2. Description of the Related Art The applicant has previously magnetically coupled two magnetic cores in series between a laminated core whose magnetic lines of force pass through the inner periphery of a primary coil bobbin and a wound core which passes through the outer periphery of a secondary coil bobbin. Japanese Patent Application No. 10-1283 proposes an ignition coil for an internal combustion engine which is capable of increasing the output in addition to miniaturization by disposing a permanent magnet.
【０００３】上記改良された内燃機関用点火コイルは、
図３及び図４に示すような概略構成を備えるものであ
る。即ち、一次コイル１及び二次コイル２をそれぞれ巻
回して同心状に配設した筒状の一次コイルボビン３及び
二次コイルボビン４と、磁力線がその一次コイルボビン
３の筒内周を通る積層鉄心５及び二次コイルボビン４の
外周を通って閉磁路をなす巻回鉄心６と、この磁気回路
に逆バイアスをかける永久磁石８、とを備えている。[0003] The improved ignition coil for an internal combustion engine includes:
It has a schematic configuration as shown in FIG. 3 and FIG. That is, a cylindrical primary coil bobbin 3 and a secondary coil bobbin 4 in which the primary coil 1 and the secondary coil 2 are respectively wound and arranged concentrically, and a laminated iron core 5 whose magnetic field lines pass through the inner circumference of the cylinder of the primary coil bobbin 3 and It includes a wound iron core 6 forming a closed magnetic path through the outer periphery of the secondary coil bobbin 4, and a permanent magnet 8 for applying a reverse bias to the magnetic circuit.
【０００４】詳しく説明すると、上記一次コイルボビン
３は、例えば合成樹脂などの電気的絶縁材にて筒状に一
体的に形成されたものであり、その外周には一次コイル
１が巻回される。一方、上記二次コイルボビン４は、一
次コイル１の外周に同心状に配設されており、例えば合
成樹脂などの電気的絶縁材にて構成されている。また、
二次コイルボビン４には、二次コイル２を分割巻するた
めの仕切として機能する複数の鍔部９…が一体的に形成
されている。即ち、その長さ方向の複数箇所に周状に設
けた鍔部９…で二次コイルボビン４を仕切り、各鍔部９
の間を二次コイル２の分割巻線溝としている。そして、
この二次コイルボビン４には、例えば一次コイル１と巻
線比１：７０〜１２０となる二次コイル２が、各鍔部９
を仕切部材として分割巻にて巻回されている。More specifically, the primary coil bobbin 3 is integrally formed in a cylindrical shape with an electrically insulating material such as a synthetic resin, and the primary coil 1 is wound around the outer periphery thereof. On the other hand, the secondary coil bobbin 4 is disposed concentrically on the outer periphery of the primary coil 1 and is made of, for example, an electrically insulating material such as a synthetic resin. Also,
The secondary coil bobbin 4 is integrally formed with a plurality of flanges 9 functioning as partitions for dividing and winding the secondary coil 2. That is, the secondary coil bobbin 4 is partitioned by a plurality of flanges 9 provided circumferentially at a plurality of positions in the length direction.
The space between the two is a divided winding groove of the secondary coil 2. And
On the secondary coil bobbin 4, for example, the secondary coil 2 having a turn ratio of 1:70 to 120 with the primary coil 1 is provided with each flange 9
As a partition member.
【０００５】前記した積層鉄心５は、短冊状の珪素鋼板
を積層してほゞ角柱状に形成したものであり、一次コイ
ルボビン３の角筒内に挿通してある。一方、巻回鉄心６
は、比較的厚みの薄い珪素鋼板を二次コイルボビン４の
外周位置において、円状または楕円状に複数巻回して形
成したものである。そして、積層鉄心５の両端面と巻回
鉄心６の内周面とは接着剤や溶接などによって接合され
て閉磁路を成し、磁気回路を構成している。The above-mentioned laminated iron core 5 is formed by laminating strip-shaped silicon steel sheets and is formed in a substantially prismatic shape, and is inserted into a rectangular cylinder of the primary coil bobbin 3. On the other hand, wound core 6
Is formed by winding a silicon steel plate having a relatively small thickness at an outer peripheral position of the secondary coil bobbin 4 in a circular or elliptical shape. Then, both end surfaces of the laminated core 5 and the inner peripheral surface of the wound core 6 are joined by an adhesive, welding, or the like to form a closed magnetic circuit, thereby forming a magnetic circuit.
【０００６】一次コイル１と一次端子１１、及び二次コ
イル２と高圧端子１２とは、それぞれ電気的に接続され
ており、一次コイル１に所定の電流を通電した後に遮断
すると、二次コイル２に発生した高電圧の電流は高圧端
子１２からハイテンションコード（図示せず）を介して
点火プラグに供給され、その先端の電極間に火花が出る
ようになっている。The primary coil 1 and the primary terminal 11 and the secondary coil 2 and the high voltage terminal 12 are electrically connected to each other. The high-voltage current is supplied from a high-voltage terminal 12 to a spark plug through a high-tension cord (not shown), and a spark is generated between electrodes at the tip of the plug.
【０００７】そして、絶縁ケース１０の開口端からエポ
キシ樹脂などの絶縁性を有する熱硬化性樹脂１３を注入
し、これにより絶縁ケース１０内部の一次コイル１、二
次コイル２を同心状に、また積層鉄心５及び巻回鉄心６
並びに永久磁石８などを所定の位置にそれぞれ固定して
いる。Then, an insulating thermosetting resin 13 such as an epoxy resin is injected from the opening end of the insulating case 10 so that the primary coil 1 and the secondary coil 2 inside the insulating case 10 are concentrically formed. Laminated core 5 and wound core 6
In addition, the permanent magnet 8 and the like are fixed at predetermined positions.
【０００８】[0008]
【発明が解決しようとする課題】上記のように構成した
従来の内燃機関用点火コイルにおいては、積層鉄心５と
巻回鉄心６との間に介在させる永久磁石８が直方体や円
筒体であって巻回鉄心６の円弧形状や積層鉄心５の端部
の形状と一致してないため、積層鉄心５、巻回鉄心６と
永久磁石８との接合部分に隙間が生じていた。このた
め、点火コイルの外径が大きくなってしまい点火コイル
全体の小型軽量化を阻む不都合があった。また、前記閉
磁路を形成する両鉄心５，６と永久磁石８との間に隙間
が生じることにより磁気回路の効率が低下し、点火コイ
ルの出力が低下するといった問題点もあった。本発明は
上記に鑑み提案されたもので、一次コイルボビンの筒内
に挿通した積層鉄心と二次コイルボビンの外周部に位置
する巻回鉄心との間に挿入した永久磁石と、上記両鉄心
との間に発生する隙間をなくすことを目的とする。In the conventional ignition coil for an internal combustion engine constructed as described above, the permanent magnet 8 interposed between the laminated core 5 and the wound core 6 is a rectangular parallelepiped or a cylindrical body. Since the shape does not match the arc shape of the wound core 6 or the shape of the end of the laminated core 5, a gap is generated at the joint between the laminated core 5, the wound core 6 and the permanent magnet 8. For this reason, the outer diameter of the ignition coil becomes large, and there is a disadvantage that the whole ignition coil is prevented from being reduced in size and weight. Further, there is a problem that a gap is formed between the two cores 5 and 6 forming the closed magnetic circuit and the permanent magnet 8 so that the efficiency of the magnetic circuit is reduced and the output of the ignition coil is reduced. The present invention has been proposed in view of the above, and a permanent magnet inserted between a laminated core inserted into the cylinder of the primary coil bobbin and a wound core located on the outer peripheral portion of the secondary coil bobbin, and the permanent magnet An object is to eliminate a gap generated between them.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
本発明は、一次コイル及び二次コイルをそれぞれ巻回し
て同心状に配設した筒状の一次コイルボビン及び二次コ
イルボビンと、磁力線が一次コイルボビンの筒内周及び
二次コイルボビンの外周を通って閉磁路を成す鉄心部
と、該鉄心部に磁気逆バイアスをかける永久磁石と、を
有する内燃機関の点火コイルにおいて、上記鉄心部は、
一次コイルボビンの筒内に位置する積層鉄心と、二次コ
イルボビンの外周に位置する巻回鉄心とからなり、上記
積層鉄心と巻回鉄心との間に配設する永久磁石は、積層
鉄心側の端面が当該積層鉄心の端面に対応する平坦面に
形成され、巻回鉄心側の端面が当該巻回鉄心の内周面に
対応する円弧面に形成されている。従って、永久磁石と
巻回鉄心との間に隙間が生じることがなく、巻回鉄心の
最大外径を小さくすることができる。また、永久磁石と
巻回鉄心との隙間がなくなることで、磁気回路の効率が
良くなり、点火コイルの出力が向上する。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cylindrical primary coil bobbin and a secondary coil bobbin in which a primary coil and a secondary coil are wound and concentrically arranged, respectively. In an ignition coil of an internal combustion engine having an iron core part forming a closed magnetic path through the inner circumference of the cylinder of the coil bobbin and the outer circumference of the secondary coil bobbin, and a permanent magnet for applying a magnetic reverse bias to the iron core part,
The permanent magnet, which is composed of a laminated core positioned in the cylinder of the primary coil bobbin and a wound core positioned on the outer periphery of the secondary coil bobbin, is disposed between the laminated core and the wound core. Is formed on a flat surface corresponding to the end surface of the laminated core, and the end surface on the wound core side is formed on an arc surface corresponding to the inner peripheral surface of the wound iron core. Therefore, there is no gap between the permanent magnet and the wound core, and the maximum outer diameter of the wound core can be reduced. In addition, since the gap between the permanent magnet and the wound iron core is eliminated, the efficiency of the magnetic circuit is improved, and the output of the ignition coil is improved.
【００１０】[0010]
【発明の実施の形態】以下に、この発明の実施の形態を
図面に基づいて詳細に説明する。図１は、この発明に係
る内燃機関用点火コイルの縦断面を示す図、図２は、図
１のＸ−Ｘ線断面図である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a longitudinal section of an ignition coil for an internal combustion engine according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.
【００１１】これらの図面において、内燃機関用点火コ
イルは、一次コイル１及び二次コイル２をそれぞれ巻回
して同心状に配設した筒状の一次コイルボビン３及び二
次コイルボビン４と、その一次コイルボビン３の角筒内
に挿通した積層鉄心５及び二次コイルボビン４（二次コ
イル２）の外周部分に位置して閉磁路を形成する巻回鉄
心６と、を有している。In these drawings, an ignition coil for an internal combustion engine includes a cylindrical primary coil bobbin 3 and a secondary coil bobbin 4 in which a primary coil 1 and a secondary coil 2 are wound and concentrically arranged, respectively, and the primary coil bobbin. 3 and a wound core 6 forming a closed magnetic path at the outer peripheral portion of the secondary coil bobbin 4 (secondary coil 2).
【００１２】一次コイルボビン３は、例えば合成樹脂な
どの電気的絶縁材にて角筒状に一体的に形成されたもの
であり、その外周には一次コイル１が巻回される。一
方、二次コイルボビン４は、一次コイル１の外周部分に
同心状に配設されており、例えば合成樹脂などの電気的
絶縁材にて構成されている。また、この二次コイルボビ
ン４には、二次コイル２を分割巻するための仕切として
機能する複数の鍔部９…が一体的に形成されている。即
ち、その長さ方向の複数箇所に周状に設けた鍔部９…で
二次コイルボビン４を仕切り、各鍔部９の間を二次コイ
ル２の分割巻線溝としている。そして、この二次コイル
ボビン４には、例えば一次コイル１と巻線比１：７０〜
１２０となる二次コイル２が、各鍔部９を仕切部材とし
て分割巻にて巻回されている。The primary coil bobbin 3 is integrally formed in a rectangular cylindrical shape with an electrical insulating material such as a synthetic resin, and the primary coil 1 is wound around the outer periphery thereof. On the other hand, the secondary coil bobbin 4 is disposed concentrically on the outer peripheral portion of the primary coil 1 and is made of, for example, an electrically insulating material such as a synthetic resin. The secondary coil bobbin 4 is integrally formed with a plurality of flange portions 9 functioning as partitions for winding the secondary coil 2 in a divided manner. That is, the secondary coil bobbin 4 is partitioned by the flanges 9 provided circumferentially at a plurality of locations in the length direction, and the divided winding grooves of the secondary coil 2 are formed between the respective flanges 9. The secondary coil bobbin 4 has, for example, a turn ratio of 1:70 to the primary coil 1.
The secondary coil 2 which is 120 is wound in divided windings with each flange 9 as a partition member.
【００１３】積層鉄心５は、短冊状の珪素鋼板を積層し
て角柱状に形成してあり、一次コイルボビン３の角筒内
に挿通してある。一方、巻回鉄心６は、比較的厚みの薄
い珪素鋼板を二次コイルボビン４の外周位置にて、円状
または楕円状ないし角円状に複数巻回して形成してあ
る。積層鉄心５の左右の両端部には永久磁石８を配設
し、この永久磁石８の巻回鉄心６側の端面を、当該巻回
鉄心６の内周面の形状に対応して円弧面に形成し、永久
磁石８と巻回鉄心６との間の隙間をなくしている。ま
た、積層鉄心５の端面と上記永久磁石８の他端面とは、
平坦面同士で密接する。そして、巻回鉄心６の内周面と
永久磁石８、及び積層鉄心５の外端面と永久磁石８とを
接着剤や溶接などによって接合して閉磁路を形成し、磁
気回路を構成している。The laminated iron core 5 is formed by laminating strip-shaped silicon steel sheets to form a prismatic shape, and is inserted into a rectangular cylinder of the primary coil bobbin 3. On the other hand, the wound iron core 6 is formed by winding a relatively thin silicon steel plate in a circular shape, an elliptical shape, or a square shape at an outer peripheral position of the secondary coil bobbin 4. Permanent magnets 8 are disposed at both left and right ends of the laminated core 5, and the end face of the permanent magnet 8 on the side of the wound core 6 is formed into an arc surface corresponding to the shape of the inner peripheral surface of the wound core 6. The gap between the permanent magnet 8 and the wound core 6 is eliminated. The end face of the laminated core 5 and the other end face of the permanent magnet 8 are
Close contact between flat surfaces. Then, the inner peripheral surface of the wound core 6 and the permanent magnet 8 and the outer end surface of the laminated core 5 and the permanent magnet 8 are joined by an adhesive or welding to form a closed magnetic circuit, thereby forming a magnetic circuit. .
【００１４】一次コイル１と一次端子１１、及び二次コ
イル２と高圧端子１２とは、それぞれ電気的に接続され
ており、一次コイル１に所定の電流を通電した後に遮断
すると、二次コイル２に発生した高電圧の電流は高圧端
子１２からハイテンションコードを介して点火プラグに
供給され、その先端の電極間に火花が出るようになって
いる。The primary coil 1 and the primary terminal 11 and the secondary coil 2 and the high voltage terminal 12 are electrically connected to each other. Is supplied from the high voltage terminal 12 to the ignition plug via the high tension cord, and a spark is generated between the electrodes at the tip.
【００１５】そして、絶縁ケース１０の開口端からエポ
キシ樹脂などの絶縁性を有する熱硬化性樹脂１３を注入
し、これにより、絶縁ケース１０内部の一次コイル１、
二次コイル２を同心状に、また積層鉄心５及び巻回鉄心
６並びに永久磁石８などを所定の位置にそれぞれ固定し
ている。尚、前記一次コイルボビン３の端部が絶縁ケー
ス１０の壁部に設けた開口に突入してこの開口を塞いで
いる。Then, an insulating thermosetting resin 13 such as an epoxy resin is injected from the opening end of the insulating case 10, whereby the primary coils 1,
The secondary coil 2 is fixed concentrically, and the laminated iron core 5, the wound iron core 6, the permanent magnet 8 and the like are fixed at predetermined positions. Note that the end of the primary coil bobbin 3 protrudes into an opening provided in the wall of the insulating case 10 to close the opening.
【００１６】以上のように、この実施の形態では、永久
磁石８の形状を巻回鉄心６の円弧形状に合わせて所謂た
かまぼこ型とすることで、磁気回路に発生する隙間をな
くしているので、巻回鉄心６の最大外径を小さくするこ
とができる。また、磁気回路の隙間をなくすことで、磁
気回路の磁気抵抗が減少し、磁気回路の効率が向上し、
最小限の鉄心断面積で点火コイルとして充分な出力を得
ることができる。As described above, in this embodiment, since the shape of the permanent magnet 8 is a so-called kamaboko type in accordance with the arc shape of the wound iron core 6, a gap generated in the magnetic circuit is eliminated. In addition, the maximum outer diameter of the wound iron core 6 can be reduced. Also, by eliminating the gap between the magnetic circuits, the magnetic resistance of the magnetic circuit is reduced, and the efficiency of the magnetic circuit is improved.
A sufficient output as an ignition coil can be obtained with a minimum iron core cross-sectional area.
【００１７】以上、本発明を図示した実施の形態に基づ
いて説明してきたが、本発明は上記した実施の形態に限
定されるものではなく、特許請求の範囲に記載した構成
を変更しない限りどのようにでも実施できる。As described above, the present invention has been described based on the illustrated embodiments. However, the present invention is not limited to the above-described embodiments, but may be modified as long as the configuration described in the claims is not changed. And so on.
【００１８】[0018]
【発明の効果】この発明は上記した構成からなるので、
以下のような効果を奏することができる。磁力線が一次
コイルボビンの筒内周を通る積層鉄心と二次コイルボビ
ンの外周を通る巻回鉄心との間に挿入する永久磁石の形
状を、積層鉄心の外端面及び巻回鉄心の内周面の形状に
対応させたので、磁気回路内の隙間がなくなり、巻回鉄
心の最大外径を小さくすることができ、点火コイルの小
型軽量化を図ることができる。また、磁気回路内に隙間
がないので、磁気抵抗が小さくなり、磁気回路の効率が
著しく向上し、最小限の鉄心材料で鉄心を構成すること
ができ、小型軽量化に大きく寄与する。Since the present invention has the above-described configuration,
The following effects can be obtained. The shape of the permanent magnet inserted between the laminated core whose magnetic lines of force pass through the inner periphery of the cylinder of the primary coil bobbin and the wound core passing through the outer periphery of the secondary coil bobbin is determined by the shape of the outer end face of the laminated core and the inner peripheral surface of the wound core. Therefore, there is no gap in the magnetic circuit, the maximum outer diameter of the wound iron core can be reduced, and the size and weight of the ignition coil can be reduced. Further, since there is no gap in the magnetic circuit, the magnetic resistance is reduced, the efficiency of the magnetic circuit is remarkably improved, and the iron core can be constituted by the minimum iron core material, which greatly contributes to the reduction in size and weight.
【図１】この発明に係る内燃機関用点火コイルの要部の
縦断面である。FIG. 1 is a longitudinal section of a main part of an ignition coil for an internal combustion engine according to the present invention.
【図２】図１のＸ−Ｘ線断面図である。FIG. 2 is a sectional view taken along line XX of FIG.
【図３】従来の内燃機関用点火コイルの要部の縦断面図
である。FIG. 3 is a longitudinal sectional view of a main part of a conventional ignition coil for an internal combustion engine.
【図４】図３のＹ−Ｙ線断面図である。FIG. 4 is a sectional view taken along line YY of FIG. 3;
１ 一次コイル ２ 二次コイル ３ 一次コイルボビン ４ 二次コイルボビン ５ 積層鉄心 ６ 巻回鉄心 ８ 永久磁石 ９ 鍔部 １０ 絶縁ケース １１ 一次端子 １２ 高圧端子 １３ 熱硬化性樹脂 DESCRIPTION OF SYMBOLS 1 Primary coil 2 Secondary coil 3 Primary coil bobbin 4 Secondary coil bobbin 5 Laminated iron core 6 Winding iron core 8 Permanent magnet 9 Flange part 10 Insulation case 11 Primary terminal 12 High voltage terminal 13 Thermosetting resin
Claims (1)
回して同心状に配設した筒状の一次コイルボビン及び二
次コイルボビンと、磁力線が一次コイルボビンの筒内周
及び二次コイルボビンの外周を通って閉磁路を成す鉄心
部と、該鉄心部に磁気逆バイアスをかける永久磁石と、
を有する内燃機関の点火コイルにおいて、 上記鉄心部は、一次コイルボビンの筒内に位置する積層
鉄心と、二次コイルボビンの外周に位置する巻回鉄心と
からなり、 上記積層鉄心と巻回鉄心との間に配設する永久磁石は、
積層鉄心側の端面が当該積層鉄心の端面に対応する平坦
面に形成され、巻回鉄心側の端面が当該巻回鉄心の内周
面に対応する円弧面に形成されていることを特徴とする
内燃機関用点火コイル。1. A cylindrical primary coil bobbin and a secondary coil bobbin in which a primary coil and a secondary coil are respectively wound and concentrically arranged, and lines of magnetic force pass through the inner circumference of the primary coil bobbin and the outer circumference of the secondary coil bobbin. An iron core forming a closed magnetic circuit, a permanent magnet for applying a magnetic reverse bias to the iron core,
In the ignition coil of an internal combustion engine having the above, the core portion is composed of a laminated core located in the cylinder of the primary coil bobbin, and a wound core located on the outer periphery of the secondary coil bobbin. The permanent magnets placed between
The end face on the laminated core side is formed on a flat surface corresponding to the end face of the laminated core, and the end face on the wound core side is formed on an arc surface corresponding to the inner peripheral surface of the wound core. Ignition coil for internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10360211A JP2000182860A (en) | 1998-12-18 | 1998-12-18 | Ignition coil for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10360211A JP2000182860A (en) | 1998-12-18 | 1998-12-18 | Ignition coil for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000182860A true JP2000182860A (en) | 2000-06-30 |
Family
ID=18468394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10360211A Pending JP2000182860A (en) | 1998-12-18 | 1998-12-18 | Ignition coil for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000182860A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007110118A (en) * | 2005-10-11 | 2007-04-26 | Robert Bosch Gmbh | Magnetic circuit for ignition coil or transformer |
-
1998
- 1998-12-18 JP JP10360211A patent/JP2000182860A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007110118A (en) * | 2005-10-11 | 2007-04-26 | Robert Bosch Gmbh | Magnetic circuit for ignition coil or transformer |
| US7508293B2 (en) * | 2005-10-11 | 2009-03-24 | Robert Bosch Gmbh | Magnetic circuit for ignition coils or transformers |
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| A02 | Decision of refusal |
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