JP2010103211A - Ignition coil for internal combustion engine - Google Patents

Ignition coil for internal combustion engine Download PDF

Info

Publication number
JP2010103211A
JP2010103211A JP2008271683A JP2008271683A JP2010103211A JP 2010103211 A JP2010103211 A JP 2010103211A JP 2008271683 A JP2008271683 A JP 2008271683A JP 2008271683 A JP2008271683 A JP 2008271683A JP 2010103211 A JP2010103211 A JP 2010103211A
Authority
JP
Japan
Prior art keywords
primary
coil
internal combustion
wire
combustion engine
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
Application number
JP2008271683A
Other languages
Japanese (ja)
Inventor
Takahiro Kamata
孝博 鎌田
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.)
Hanshin Electric Co Ltd
Original Assignee
Hanshin Electric Co Ltd
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 Hanshin Electric Co Ltd filed Critical Hanshin Electric Co Ltd
Priority to JP2008271683A priority Critical patent/JP2010103211A/en
Publication of JP2010103211A publication Critical patent/JP2010103211A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for an internal combustion engine, capable of contributing to improvement in productivity and reliability in addition to miniaturization, improvement in insulation performance and cost efficiency. <P>SOLUTION: The ignition coil for the internal combustion engine is configured in such a way that a primary coil 2 is made of a primary wire 22 and a primary bobbin 21 for winding the primary wire 22, a secondary coil 3 made of only a secondary wire is wound on the primary coil 2 having the primary wire 22 around the primary bobbin 21 directly continuously (without separately winding), and especially, the secondary coil 3 is wound so that the winding outer shape may be a chevron in cross sectional view. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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、絶縁性、経済性等の要請に応える内燃機関用点火コイルに関する。   The present invention relates to a molded internal combustion engine ignition coil that supplies a high voltage to generate a spark discharge, for example, in an ignition plug of an automobile engine, and more particularly to an internal combustion engine that meets demands for miniaturization, insulation, economy, and the like. The present invention relates to an engine ignition coil.

従来のモールド型の内燃機関用点火コイル１０について、図４及び図５を用いて説明する。   A conventional molded type ignition coil 10 for an internal combustion engine will be described with reference to FIGS.

図４は、従来の内燃機関用点火コイルの縦断面図、図５は、図４の要部拡大図である。
これらの図において、従来の内燃機関用点火コイル１０は、一次電線２２及び二次電線３２をそれぞれ巻回し、同心状に配設した筒状の一次ボビン２１及び二次ボビン３１と、その一次ボビン２１の筒内周及び二次ボビン３１の外周を通って閉磁路を成す鉄心４と、これらを収容する絶縁ケース５と、この絶縁ケース５内に注入されて硬化し、収容した各部品の絶縁を維持する絶縁樹脂としての熱硬化性樹脂、例えば、エポキシ樹脂９と、を有している。 4 is a longitudinal sectional view of a conventional ignition coil for an internal combustion engine, and FIG. 5 is an enlarged view of a main part of FIG.
In these drawings, a conventional ignition coil 10 for an internal combustion engine includes a cylindrical primary bobbin 21 and a secondary bobbin 31 that are wound around a primary electric wire 22 and a secondary electric wire 32 and are concentrically arranged, and the primary bobbin. The iron core 4 that forms a closed magnetic path through the inner circumference of the cylinder 21 and the outer circumference of the secondary bobbin 31, the insulating case 5 that accommodates them, and the resin that is injected into the insulating case 5 and hardened, and the insulation of the accommodated components And a thermosetting resin, for example, an epoxy resin 9 as an insulating resin for maintaining the resistance.

鉄心４は、ほぼＥ字状をなした珪素鋼板の積層鉄心の端部同士が向かい合わされて接着剤や溶接などによって接合されたものであり、全体で閉磁路を成す磁気回路を構成している。
一次ボビン２１は、例えば、合成樹脂等の電気的絶縁材にて一体的に形成され、その外周に一次電線２２が巻回されている。
二次ボビン３１は、一次電線２２の外周に同心状に配設され、例えば、合成樹脂等の電気的絶縁材にて構成され、かつ、二次電線３２を分割巻するための仕切りとして機能する複数個の鍔部３１１が一体的に成型されている。また、例えば、一次電線２２と巻線比にして１：８０〜１２０となる二次電線３２が、各鍔部３１１を仕切りとして分割巻にて巻回されている。
合成樹脂等の絶縁材にて成型された絶縁ケース５は、一次電線２２および一次ボビン２１からなる一次コイル２、二次電線３２および二次ボビン３１からなる二次コイル３、鉄心４が収容され、絶縁ケース５の一端に一次端子６が、他端に高圧端子８がそれぞれ配設されている。 The iron core 4 is formed by facing ends of laminated iron cores of silicon steel plates having a substantially E shape and joined by an adhesive, welding, or the like, and constitutes a magnetic circuit that forms a closed magnetic circuit as a whole. .
The primary bobbin 21 is integrally formed with an electrical insulating material such as synthetic resin, for example, and a primary electric wire 22 is wound around the outer periphery thereof.
The secondary bobbin 31 is concentrically disposed on the outer periphery of the primary electric wire 22, is configured by an electrical insulating material such as synthetic resin, and functions as a partition for dividing and winding the secondary electric wire 32. A plurality of flange portions 311 are integrally formed. Further, for example, the secondary electric wire 32 having a winding ratio of 1:80 to 120 with the primary electric wire 22 is wound in divided winding with each flange portion 311 as a partition.
The insulating case 5 molded of an insulating material such as synthetic resin accommodates the primary coil 2 composed of the primary electric wire 22 and the primary bobbin 21, the secondary coil 3 composed of the secondary electric wire 32 and the secondary bobbin 31, and the iron core 4. The primary terminal 6 is disposed at one end of the insulating case 5 and the high-voltage terminal 8 is disposed at the other end.

そして、従来の内燃機関用点火コイル１０は、一次電線２２と一次端子６とが電気的に接続され、二次電線３２と高圧端子８とが電気的に接続されて、一次電線２２に所定の電流が通電され、遮断されると、二次電線３２に高電圧が発生し、この高電圧の電流が高圧端子８からスプリングを介して点火プラグに供給されるものである。   In the conventional ignition coil 10 for an internal combustion engine, the primary wire 22 and the primary terminal 6 are electrically connected, the secondary wire 32 and the high-voltage terminal 8 are electrically connected, and the primary wire 22 is When the current is turned on and off, a high voltage is generated in the secondary electric wire 32, and this high voltage current is supplied from the high voltage terminal 8 to the spark plug via the spring.

このような内燃機関用点火コイル１０は、例えば、自動車のエンジンに取り付けられる場合が多く、その場合、点火プラグホールやエンジンロッカーカバー等の寸法から来る制約が厳しく、取付スペースの問題から小型化の要請を受けている。さらに、高出力化、コストダウンの要請なども強く、例えば、下記特許文献１又は特許文献２において、これらの要請を受けて創作された発明が提案されている。
特開平１０−２２３４６３号公報 特開平１１−２０４３５６号公報 Such an ignition coil 10 for an internal combustion engine is often attached to, for example, an automobile engine, and in that case, restrictions imposed by dimensions such as an ignition plug hole and an engine rocker cover are severe. I have received a request. Furthermore, there is a strong demand for higher output and cost reduction. For example, Patent Document 1 or Patent Document 2 below proposes an invention created in response to these requests.
JP-A-10-223463 Japanese Patent Laid-Open No. 11-204356

上記特許文献１又は特許文献２では、二次ボビンの形状を太鼓型とすることにより、また、二次電線を分割巻するための仕切りとして機能する複数個の鍔部の形状等を改良することにより、小型化の要請とともに、併せて高出力化の要請を解決している。   In the above Patent Document 1 or Patent Document 2, the shape of the secondary bobbin is made a drum shape, and the shape of a plurality of collars that function as a partition for dividing and winding the secondary wire is improved. This solves the demand for higher output as well as the demand for smaller size.

しかし、図４及び図５に示すような従来の内燃機関用点火コイル１０における二次ボビン３１の形状では、溝部３１２と鍔部３１１とを有するが故に、上記巻線比を考慮すると、二次コイル３が全体として大きくなる傾向があるので、小型化の要請から鍔部３１１の厚みを薄くしすぎると、二次電線３２の巻回時に鍔部３１１が倒れ、次の溝部３１２に二次電線３２が巻回できなくなってしまい、生産性が悪くなるという問題が生じている。さらに、二次ボビン３１の各鍔部３１１の間に、絶縁ケース５に注入するエポキシ樹脂９が入ってくると、巻回した二次電線３２と鍔部３１１又は溝部３１２とが剥離して空間が発生し、電流の通電、遮断時に電線同士が絶縁破壊を起こしやすくなって、火花放電をするために十分な高電圧を点火プラグに供給することができなくなるおそれがあって、信頼性の向上が困難となるという課題もあった。   However, the shape of the secondary bobbin 31 in the conventional ignition coil 10 for an internal combustion engine as shown in FIGS. 4 and 5 includes the groove portion 312 and the flange portion 311. Since the coil 3 tends to be large as a whole, if the thickness of the flange portion 311 is made too thin due to a demand for miniaturization, the flange portion 311 falls when the secondary wire 32 is wound, and the secondary wire is placed in the next groove portion 312. There is a problem that 32 cannot be wound and productivity is deteriorated. Further, when the epoxy resin 9 to be injected into the insulating case 5 enters between the flange portions 311 of the secondary bobbin 31, the wound secondary electric wire 32 and the flange portion 311 or the groove portion 312 are separated to form a space. This increases the reliability of the electrical plug because it can easily cause dielectric breakdown between currents when it is energized or interrupted, making it impossible to supply the spark plug with a high voltage sufficient for spark discharge. There is also a problem that it becomes difficult.

本発明は、上記実情に鑑み提案されたもので、二次ボビンを構成物品から除く等の工夫により、小型化、絶縁性、経済性のほか、生産性、信頼性の向上に寄与することが可能な内燃機関用点火コイルを提供することを目的とする。   The present invention has been proposed in view of the above circumstances, and it is possible to contribute to improvement of productivity and reliability in addition to miniaturization, insulation, and economic efficiency by removing the secondary bobbin from the constituent articles. An object is to provide a possible ignition coil for an internal combustion engine.

上記目的を達成するために、絶縁ケース内に、一次コイルと、二次コイルと、前記一次コイルの内側を貫通し、前記一次コイル及び前記二次コイルとの間で電磁回路を形成する鉄心とを収容するとともに、熱硬化性樹脂を注入し硬化して前記一次コイル、前記二次コイル及び前記鉄心間の絶縁を確保した内燃機関用点火コイルにおいて、前記一次コイルは、一次電線及びこの一次電線を巻回する一次ボビンからなり、前記二次コイルを、前記一次ボビンに前記一次電線を巻回した一次コイル上に直接巻回した、ことを特徴とする。   In order to achieve the above object, a primary coil, a secondary coil, and an iron core that penetrates the inside of the primary coil and forms an electromagnetic circuit between the primary coil and the secondary coil in an insulating case, In the ignition coil for an internal combustion engine in which a thermosetting resin is injected and cured to ensure insulation between the primary coil, the secondary coil, and the iron core, the primary coil includes the primary wire and the primary wire. The secondary coil is wound directly on a primary coil in which the primary wire is wound around the primary bobbin.

特に、二次コイルを、巻線外形が断面視略山型又は略台形になるように巻回することが好ましい。   In particular, it is preferable to wind the secondary coil so that the winding outer shape is a substantially mountain shape or a substantially trapezoidal shape in cross section.

本発明では、一次電線及びこの一次電線を巻回する一次ボビンで一次コイルとし、二次コイルを、一次ボビンに一次電線を巻回した上記一次コイル上に直接巻回して内燃機関用点火コイルを構成したので、二次ボビンが不要となって、部品点数の低減によりコストダウンを実現しつつ、二次電線の巻回時に鍔部が倒れてくるような問題を不問として生産性を向上することができる。さらに、二次ボビンと巻回した二次電線と鍔部又は溝部とが剥離して空間が発生することもなく、火花放電をするために十分な高電圧を確実に点火プラグに供給することができ、内燃機関用点火コイルの信頼性を向上することができる。   In the present invention, a primary coil and a primary bobbin that winds the primary wire are used as a primary coil, and a secondary coil is wound directly on the primary coil in which the primary wire is wound around the primary bobbin so that an ignition coil for an internal combustion engine is provided. Because it is configured, a secondary bobbin is not required, and the cost can be reduced by reducing the number of parts, while improving productivity by unquestioning the problem that the buttock collapses when the secondary wire is wound. Can do. Furthermore, the secondary bobbin and the wound secondary electric wire and the flange or groove do not separate and no space is generated, and a high voltage sufficient for spark discharge can be reliably supplied to the spark plug. And the reliability of the ignition coil for an internal combustion engine can be improved.

特に、二次コイルを巻線外形が断面視略山型又は略台形になるように連続して巻回したので、コンパクトな二次コイルの形状により、二次コイルと一次電線との巻線比を従来と同等又はそれ以上とすることができ、内燃機関用点火コイルの高出力化を促すことが可能となる。   In particular, since the secondary coil is continuously wound so that the outer shape of the winding is substantially mountain-shaped or trapezoidal in cross-section, the winding ratio of the secondary coil to the primary wire is reduced by the compact shape of the secondary coil. Can be made equal to or higher than that of the prior art, and it is possible to promote higher output of the ignition coil for the internal combustion engine.

以下、本発明に係る内燃機関用点火コイルの実施形態を図面にもとづいて詳述する。
図１は、本発明に係る内燃機関用点火コイルの概略縦断面図、図２は、本発明に係る内燃機関用点火コイルにおける要部となる一次コイル及び二次コイルの概略縦断面図、図３は、本発明を発展させた実施例に係る二次コイルの概略縦断面図である。なお、図４及び図５に従来例として示した部分と同一又は相当部分には、同一符号を付して説明を省略する。 Embodiments of an ignition coil for an internal combustion engine according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional view of an ignition coil for an internal combustion engine according to the present invention, and FIG. 2 is a schematic longitudinal sectional view of a primary coil and a secondary coil that are essential parts in the ignition coil for an internal combustion engine according to the present invention. 3 is a schematic longitudinal sectional view of a secondary coil according to an embodiment in which the present invention is developed. Note that the same or corresponding parts as those shown in FIGS. 4 and 5 as conventional examples are denoted by the same reference numerals and description thereof is omitted.

本発明は、図１に示すとおり、絶縁ケース５内に、一次コイル２と、この一次コイル２の外側に配設される二次コイル３と、一次コイル２の内側を貫通し、一次コイル２及び二次コイル３との間で電磁回路を形成する鉄心４とを収容するとともに、絶縁樹脂としての熱硬化性樹脂、例えば、エポキシ樹脂９を注入し硬化して絶縁を確保した内燃機関用点火コイル１であって、特に、図２に示すとおり、一次コイル２は、一次電線２２及びこの一次電線２２を巻回する一次ボビン２１からなり、二次電線のみからなる二次コイル３を、一次ボビン２１に一次電線２２を巻回した一次コイル２上に直接連続して（分割巻をせずに）巻回したものである。なお、二次コイル３は、一次コイル２上に巻線外形が断面視略山型になるように巻回されている。   As shown in FIG. 1, the present invention penetrates the primary coil 2, the secondary coil 3 disposed outside the primary coil 2, and the inside of the primary coil 2 in the insulating case 5. And an iron core 4 that forms an electromagnetic circuit with the secondary coil 3, and an ignition for an internal combustion engine in which a thermosetting resin as an insulating resin, for example, an epoxy resin 9 is injected and cured to ensure insulation In particular, as shown in FIG. 2, the primary coil 2 includes a primary wire 22 and a primary bobbin 21 around which the primary wire 22 is wound, and the secondary coil 3 including only the secondary wire is The primary wire 22 is wound around the bobbin 21 directly and continuously (without split winding). Note that the secondary coil 3 is wound on the primary coil 2 so that the outer shape of the winding has a substantially mountain shape in cross section.

以下、図２にもとづいて具体的に説明する。
一次ボビン２１は、両端にのみ鍔状のフランジ部２１ｙを備える筒状の形態を有する。また、両端のフランジ部２１ｙの間には、フランジ部２１ｙに比べ相対的に凹んだ電線巻回部２１ｘが形成されている。この電線巻回部２１ｘに一次電線２１が連続して（分割巻されずに）巻回されて、この一次ボビン２１と一次電線２２とで一次コイル２を構成している。そして、両端のフランジ部２１ｙの高さは、従来の一次ボビン２１と比べ背丈を高くして、例えば、従来に比べ２倍背丈を高くして設けられている。 Hereinafter, a specific description will be given with reference to FIG.
The primary bobbin 21 has a cylindrical form provided with flanged flange portions 21y only at both ends. Further, between the flange portions 21y at both ends, a wire winding portion 21x that is relatively recessed as compared with the flange portion 21y is formed. The primary wire 21 is continuously wound around the wire winding portion 21x (not dividedly wound), and the primary bobbin 21 and the primary wire 22 constitute the primary coil 2. And the height of the flange part 21y of both ends is made high height compared with the conventional primary bobbin 21, for example, is heightened twice compared with the past, and is provided.

一次コイル２上には、二次電線のみからなる二次コイル３が直接連続して（分割巻をせずに）巻回されている。特に、二次コイル３は、一次コイル２の両端のフランジ部２１ｙから遠い中央部分に位置するほど高さのある断面視略山型になるようにして一次コイル２上に巻回されている。この二次コイル３の断面視略山型の両端部分は、従来の一次ボビン２１と比べ２倍高くして設けられている一次ボビン２１のフランジ部２１ｙの上部内壁２１ｚにそれぞれ接している。これにより、二次コイル３は、巻回の過程において巻ずれを起こすこともない。   On the primary coil 2, the secondary coil 3 consisting only of the secondary electric wire is directly and continuously wound (without split winding). In particular, the secondary coil 3 is wound on the primary coil 2 such that the secondary coil 3 has a substantially mountain shape in cross-section as it is located at a central portion farther from the flange portions 21 y at both ends of the primary coil 2. Both end portions of the secondary coil 3 having a substantially mountain shape in sectional view are in contact with the upper inner wall 21z of the flange portion 21y of the primary bobbin 21 provided twice as high as the conventional primary bobbin 21. Thereby, the secondary coil 3 does not cause winding deviation in the winding process.

なお、図示しないが、外側に略くの字状に突出させた形状の絶縁板（例えば、合成樹脂等の電気的絶縁材にて構成された板材）が、一次コイル２のフランジ部２１ｙを両端とし、二次コイル２の外側を頂点として架設されている。この絶縁板の略くの字状の突出部には、二次コイル３の巻終わり部と接続するための線材としての、例えば、リン青銅線を固定する固定部が設けられ、この固定部にて、二次コイル３の巻終わり部３ａがリン青銅線の一方に複数回、例えば、１０回、巻回されて接続されている。
なお、このリン青銅線の他方は、図１に示す高圧端子８（高圧側）に接続される。また、二次コイル３の図示しない巻はじめ部は、低圧側である図１に示す一次端子６に接続されている。 Although not shown, an insulating plate (for example, a plate made of an electrical insulating material such as a synthetic resin) having a shape that protrudes outward in a substantially U shape has the flange portion 21y of the primary coil 2 at both ends. And the outside of the secondary coil 2 is installed as a vertex. For example, a fixing portion for fixing a phosphor bronze wire, for example, as a wire for connecting to the winding end portion of the secondary coil 3 is provided on the substantially U-shaped protruding portion of the insulating plate. Thus, the winding end portion 3a of the secondary coil 3 is wound and connected to one side of the phosphor bronze wire a plurality of times, for example, 10 times.
The other end of the phosphor bronze wire is connected to the high voltage terminal 8 (high voltage side) shown in FIG. Further, a winding start portion (not shown) of the secondary coil 3 is connected to the primary terminal 6 shown in FIG.

上記のような関係で一次コイル２と二次コイル３とを構成すれば、従来必要であった二次ボビン３１を不要としてコストダウンを果たすことが可能となる。さらに、二次コイル３の巻線外形を断面視略山型になるようにしているので、高出力化のために一次コイル２との巻線比を考慮しても、二次コイル３が大型化するような問題もほとんど生じない。また、二次コイル３の図示しない巻はじめ部は、図１に示す一次端子６に接続されて低圧側であるために、電流の通電、遮断時の二次コイル３の絶縁破壊も極めて生じにくい構成となる。   If the primary coil 2 and the secondary coil 3 are configured in the above relationship, the cost reduction can be achieved by eliminating the need for the secondary bobbin 31 that has been conventionally required. Furthermore, since the winding outer shape of the secondary coil 3 has a substantially mountain shape in cross section, the secondary coil 3 is large even if the winding ratio with the primary coil 2 is taken into account for higher output. There is almost no problem of becoming. Further, since the winding start portion (not shown) of the secondary coil 3 is connected to the primary terminal 6 shown in FIG. 1 and is on the low voltage side, dielectric breakdown of the secondary coil 3 at the time of energization and interruption of current is extremely unlikely to occur. It becomes composition.

また、従来と違って、二次ボビン３１が不要であるため、本発明に係る内燃機関用点火コイル１では、当然に、二次コイル３の巻回時に鍔部３１１が倒れてくるような問題が解決され、さらに、巻回した二次コイル３２と二次ボビン３１の鍔部３１１又は溝部３１２とが剥離して空間が発生することもない。このほか、二次コイル３の巻線外形は断面視略山型であるため、コンパクトな二次コイル３の形態のまま巻線比を考慮することが可能となり、一次コイル２と二次コイル３との巻線比を従来と同等又はそれ以上とすることが可能となる。   Further, unlike the conventional case, since the secondary bobbin 31 is not necessary, the ignition coil 1 for an internal combustion engine according to the present invention naturally has a problem that the collar portion 311 falls down when the secondary coil 3 is wound. In addition, the wound secondary coil 32 and the flange portion 311 or the groove portion 312 of the secondary bobbin 31 are not separated to generate a space. In addition, since the winding outer shape of the secondary coil 3 is substantially mountain-shaped in cross section, it is possible to consider the winding ratio while maintaining the compact secondary coil 3 form, and the primary coil 2 and the secondary coil 3 can be considered. The winding ratio can be made equal to or higher than the conventional one.

すなわち、本発明は、内燃機関用点火コイル１における一次コイル２を、一次電線２２及びこの一次電線２２を巻回する一次ボビン２１からなるものとし、二次電線３２のみからなる二次コイル３を、一次ボビン２１に一次電線２２を巻回した一次コイル２上に直接連続して（分割巻をせずに）巻回し、さらに、二次コイル３を巻線外形が断面視略山型になるように巻回しているので、二次ボビン３１を不要としてコストダウンを実現しつつ、二次電線３２の巻回時に鍔部３１１が倒れてくるような問題を解決することができ、さらに、巻回した二次電線３２と鍔部３１１又は溝部３１２との剥離の問題を不問として、火花放電をするために十分な高電圧を確実に点火プラグに供給することができる。また、二次コイル３を一次コイル２上に巻線外形が断面視略山型になるように連続して巻回したことにより、一次コイル２と二次コイル３との巻線比を考慮しても、二次コイル３が大型化するような問題もほとんど生じない。さらに、コンパクトな二次コイル３の形態のままで、巻線比を考慮することが可能となり、二次コイル３と一次コイル２との巻線比を従来と同等又はそれ以上とすることも可能である。   That is, in the present invention, the primary coil 2 in the ignition coil 1 for an internal combustion engine is composed of the primary electric wire 22 and the primary bobbin 21 around which the primary electric wire 22 is wound, and the secondary coil 3 consisting of only the secondary electric wire 32 is provided. The primary coil 2 wound around the primary bobbin 21 is directly and continuously wound on the primary coil 2 (without split winding), and the secondary coil 3 has a substantially mountain shape in cross-sectional view in winding. Thus, the secondary bobbin 31 is not required and the cost can be reduced while solving the problem that the collar 311 falls down when the secondary electric wire 32 is wound. Regardless of the problem of peeling between the rotated secondary electric wire 32 and the flange 311 or the groove 312, it is possible to reliably supply a high voltage sufficient for spark discharge to the spark plug. Further, by winding the secondary coil 3 continuously on the primary coil 2 so that the outer shape of the winding has a substantially mountain shape in cross section, the winding ratio between the primary coil 2 and the secondary coil 3 is taken into consideration. However, the problem that the secondary coil 3 enlarges hardly arises. Furthermore, it is possible to consider the turn ratio while maintaining the compact form of the secondary coil 3, and the turn ratio between the secondary coil 3 and the primary coil 2 can be equal to or higher than the conventional one. It is.

なお、二次コイル３の巻はじめ部を、一次端子６に接続して低圧側とすれば、電流の通電、遮断時の二次コイル３の絶縁破壊も極めて生じにくい内燃機関用点火コイル１を提供することができ、したがって、二次コイル３の小型化、絶縁性及び生産性が向上し、かつ、内燃機関用点火コイル１の経済性、信頼性の向上に寄与することも可能となる。   If the winding start portion of the secondary coil 3 is connected to the primary terminal 6 on the low voltage side, the ignition coil 1 for an internal combustion engine that hardly causes dielectric breakdown of the secondary coil 3 at the time of energization and interruption of current is provided. Accordingly, the secondary coil 3 can be reduced in size, insulation and productivity, and can contribute to the improvement of the economy and reliability of the ignition coil 1 for an internal combustion engine.

ここで、本発明は、上記実施形態のほか、内燃機関用点火コイルにおける二次コイルの巻線外形を断面視略台形となるようにして一次コイル上に直接巻回しても、望ましい実施形態となる。二次コイルの巻線外形を断面視略山型とするか、断面視略台形とするかは、内燃機関用点火コイルの小型化の要請との関係で、適宜選択すればよいものであり、いずれも上記のような効果を得ることが可能である。   Here, in addition to the above-described embodiment, the present invention can be applied to a preferable embodiment even if the winding outer shape of the secondary coil in the ignition coil for an internal combustion engine is directly wound on the primary coil so as to be substantially trapezoidal in cross section. Become. Whether the winding outer shape of the secondary coil has a substantially mountain shape in cross section or a substantially trapezoidal shape in cross section can be appropriately selected in relation to the demand for downsizing of the ignition coil for an internal combustion engine, In any case, it is possible to obtain the effects as described above.

以上、本発明の実施形態について説明したが、本発明は上記した具体的な実施形式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適宜に実施できる。   Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments described above, and can be appropriately implemented without changing the configuration described in the claims.

例えば、上記実施形態では、二次ボビンを不要とした内燃機関用点火コイルを例示して説明したが、図３に示すような、両端にのみ鍔状のフランジ部３１ｙを備え、両端のフランジ部３１ｙの間にフランジ部３１ｙに比べ相対的に凹んだ電線巻回部３１ｘが形成されている筒状の形態を有する二次ボビン３１を用い、この二次ボビン３１の電線巻回部３１ｘに、巻線外形が両端のフランジ部３１ｙから遠い中央部分に位置するほど高さのある断面視略山型（又は断面視略台形）になるようにして二次コイル３（二次電線３２）巻回しても好ましい実施形態となる。
この形態では、二次ボビン３１が必要となるものの、二次コイル３（二次電線３２）の巻ずれが生じにくいという有利な効果を有するとともに、内燃機関用点火コイル１の小型化、絶縁性、経済性のほか、生産性、信頼性の向上に寄与するという上記実施形態と同等の効果を得ることが可能である。 For example, in the above-described embodiment, the ignition coil for an internal combustion engine that does not require a secondary bobbin is described as an example. However, as shown in FIG. 3, the flange portions 31y are provided only at both ends, and the flange portions at both ends are provided. A secondary bobbin 31 having a cylindrical shape in which a wire winding portion 31x that is relatively recessed compared to the flange portion 31y is formed between 31y and the wire winding portion 31x of the secondary bobbin 31 is used. Winding the secondary coil 3 (secondary wire 32) so that the outer shape of the winding becomes a substantially mountain shape in cross section (or a trapezoidal shape in cross section) as the center of the winding is located farther from the flange portion 31y at both ends. However, this is a preferred embodiment.
In this embodiment, although the secondary bobbin 31 is required, it has an advantageous effect that the secondary coil 3 (secondary wire 32) is less likely to be unwound, and the internal combustion engine ignition coil 1 can be reduced in size and insulated. In addition to economic efficiency, it is possible to obtain an effect equivalent to that of the above embodiment that contributes to improvement of productivity and reliability.

本発明に係る内燃機関用点火コイルの概略縦断面図である。It is a schematic longitudinal cross-sectional view of the ignition coil for internal combustion engines which concerns on this invention. 本発明に係る内燃機関用点火コイルにおける要部となる一次コイル及び二次コイルの概略縦断面図である。It is a schematic longitudinal cross-sectional view of the primary coil and the secondary coil which become the principal part in the ignition coil for internal combustion engines which concerns on this invention. 本発明を発展させた実施例に係る二次コイルの概略縦断面図である。It is a schematic longitudinal cross-sectional view of the secondary coil which concerns on the Example which developed this invention. 従来の内燃機関用点火コイルの縦断面図ある。It is a longitudinal cross-sectional view of the conventional ignition coil for internal combustion engines. 図４の要部拡大図である。It is a principal part enlarged view of FIG.

符号の説明Explanation of symbols

１ 内燃機関用点火コイル
１０ 従来の内燃機関用点火コイル
２ 一次コイル
２１ 一次ボビン
２１ｘ 電線巻回部
２１ｙ フランジ部
２１ｚ 上部内壁
２２ 一次電線
３ 二次コイル（二次電線）
３ａ 巻終わり部
３１ 二次ボビン
３１ｘ 電線巻回部
３１ｙ フランジ部
３１１ 鍔部
３１２ 溝部
３２ 二次電線
４ 鉄心
５ 絶縁ケース
６ 一次端子
８ 高圧端子
９ エポキシ樹脂（熱硬化性樹脂、絶縁樹脂） DESCRIPTION OF SYMBOLS 1 Ignition coil for internal combustion engines 10 Conventional ignition coil for internal combustion engines 2 Primary coil 21 Primary bobbin 21x Wire winding part 21y Flange part 21z Upper inner wall 22 Primary electric wire 3 Secondary coil (secondary electric wire)
3a Winding end portion 31 Secondary bobbin 31x Wire winding portion 31y Flange portion 311 Gutter portion 312 Groove portion 32 Secondary wire 4 Iron core 5 Insulating case 6 Primary terminal 8 High voltage terminal 9 Epoxy resin (thermosetting resin, insulating resin)

Claims (2)

絶縁ケース内に、一次コイルと、二次コイルと、前記一次コイルの内側を貫通し、前記一次コイル及び前記二次コイルとの間で電磁回路を形成する鉄心とを収容するとともに、熱硬化性樹脂を注入し硬化させた内燃機関用点火コイルにおいて、
前記一次コイルは、一次電線及びこの一次電線を巻回する一次ボビンからなり、
前記二次コイルを、前記一次ボビンに前記一次電線を巻回した一次コイル上に直接巻回した、
ことを特徴とする内燃機関用点火コイル。 An insulating case contains a primary coil, a secondary coil, and an iron core that penetrates the inside of the primary coil and forms an electromagnetic circuit between the primary coil and the secondary coil, and is thermosetting. In an ignition coil for an internal combustion engine in which resin is injected and cured,
The primary coil comprises a primary wire and a primary bobbin that winds the primary wire,
The secondary coil was directly wound on a primary coil in which the primary wire was wound around the primary bobbin,
An ignition coil for an internal combustion engine. 前記二次コイルを、巻線外形が断面視略山型又は略台形になるように巻回した、
ことを特徴とする請求項１に記載の内燃機関用点火コイル。 The secondary coil was wound such that the winding outer shape was a substantially mountain shape or a substantially trapezoidal shape in cross section,
The ignition coil for an internal combustion engine according to claim 1.
JP2008271683A 2008-10-22 2008-10-22 Ignition coil for internal combustion engine Pending JP2010103211A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008271683A JP2010103211A (en) 2008-10-22 2008-10-22 Ignition coil for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008271683A JP2010103211A (en) 2008-10-22 2008-10-22 Ignition coil for internal combustion engine

Publications (1)

Publication Number Publication Date
JP2010103211A true JP2010103211A (en) 2010-05-06

Family

ID=42293629

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008271683A Pending JP2010103211A (en) 2008-10-22 2008-10-22 Ignition coil for internal combustion engine

Country Status (1)

Country Link
JP (1) JP2010103211A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5291127A (en) * 1976-01-28 1977-08-01 Hitachi Ltd Ignition coil
JPS5439511U (en) * 1977-08-24 1979-03-15
JPH10223463A (en) * 1997-02-12 1998-08-21 Hanshin Electric Co Ltd Ignition coil for internal combustion engine
JP2001118741A (en) * 1999-10-20 2001-04-27 Hitachi Ltd Ignition coil and its winding method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5291127A (en) * 1976-01-28 1977-08-01 Hitachi Ltd Ignition coil
JPS5439511U (en) * 1977-08-24 1979-03-15
JPH10223463A (en) * 1997-02-12 1998-08-21 Hanshin Electric Co Ltd Ignition coil for internal combustion engine
JP2001118741A (en) * 1999-10-20 2001-04-27 Hitachi Ltd Ignition coil and its winding method

Similar Documents

Publication Publication Date Title
US9117585B2 (en) Ignition coil
JP4992926B2 (en) Ignition coil for internal combustion engine
JP2009088479A (en) Ignition coil
US7212092B2 (en) Device for energy storage and energy transformation
US6724289B2 (en) Ignition apparatus having feature for shielding the HV terminal
EP2660833B1 (en) Ignition coil
JP2000199470A (en) Ignition device of internal combustion engine
US6747540B1 (en) Ignition coil for internal combustion engine
JP2006108721A (en) Electromagnetic device
JP2008166365A (en) Insulating member for ignition coil
JP5703945B2 (en) Ignition coil and method of manufacturing ignition coil
JP6750811B1 (en) Ignition device for internal combustion engine
JP2010103211A (en) Ignition coil for internal combustion engine
JP2008041831A (en) Ignition coil
JP2010103210A (en) Ignition coil for internal combustion engine
US20160111206A1 (en) Transformer
JP4554696B2 (en) Ignition device for internal combustion engine
JP2009135207A (en) Ignition coil
JP4020998B2 (en) Ignition coil for internal combustion engine
US20030128090A1 (en) Case free ignition apparatus
JP2006140527A (en) Electromagnetic device
JP2009158559A (en) Coil
JP5956973B2 (en) Ignition coil for internal combustion engines
JP2003229317A (en) Internal combustion engine
JP2002260938A (en) Ignition coil for internal combustion engine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110905

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120626

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120703

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20121030