JP2020161633A

JP2020161633A - Ignition coil

Info

Publication number: JP2020161633A
Application number: JP2019059211A
Authority: JP
Inventors: 小西　敦之; Atsushi Konishi; 敦之小西
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-10-01
Anticipated expiration: 2039-03-26
Also published as: JP7259471B2

Abstract

To provide an ignition coil capable of easily improving productively.SOLUTION: An ignition coil 1 comprises: a primary coil 11; a secondary coil 12; a peripheral core 2; an opposite coated steel board part 4; and a sealing resin 13. The primary coil 11 and the secondary coil 12 are magnetically coupled each other. The peripheral core 2 is formed by laminating a plurality of coated steel boards 3 in a lamination direction Z. Each coated steel board 3 comprises: a steel board; and an insulation coated film that coats both surfaces of the steel board. The peripheral core 2 is arranged on an outer peripheral side of the primary coil 11 and the secondary coil 12. The opposite coated steel board part 4 is opposite to an inner lamination surface 2a formed in an inner periphery of the outer peripheral core 2, and is constituted of coated steel boards 3. The sealing resin 13 seals the primary coil 11, the secondary coil 12, the opposite coated steel board part 4, and the outer peripheral core 2.SELECTED DRAWING: Figure 2

Description

本発明は、点火コイルに関する。 The present invention relates to an ignition coil.

特許文献１には、内燃機関用の点火コイルが開示されている。特許文献１に記載の点火コイルは、一次コイル及び二次コイル、コア、ケース、封止樹脂を備える。一次コイル及び二次コイルは、互いに磁気的に結合している。コアは、一次コイルへの通電及びその遮断により生じる磁束の磁路を形成する。コアは、一次コイル及び二次コイルの内周側に配される中心コアと、一次コイル及び二次コイルの外周側に配される環状の外周コアとを有する。ケースは、一次コイル、二次コイル、コア等の点火コイルの構成部品を収容する。封止樹脂は、ケース内に充填され、ケース内に収容された点火コイルの構成部品を封止する。 Patent Document 1 discloses an ignition coil for an internal combustion engine. The ignition coil described in Patent Document 1 includes a primary coil, a secondary coil, a core, a case, and a sealing resin. The primary coil and the secondary coil are magnetically coupled to each other. The core forms a magnetic path of magnetic flux generated by energizing and shutting off the primary coil. The core has a central core arranged on the inner peripheral side of the primary coil and the secondary coil, and an annular outer peripheral core arranged on the outer peripheral side of the primary coil and the secondary coil. The case houses the components of the ignition coil such as the primary coil, the secondary coil, and the core. The sealing resin is filled in the case and seals the components of the ignition coil housed in the case.

ここで、外周コアは、被覆鋼板を積層することで構成することが可能である。被覆鋼板は、例えば、珪素鋼板の表面に、渦電流損の低減のための絶縁被膜を形成し、その後、この珪素鋼板を特定形状に打ち抜くことにより製造される。これにより、外周コアの内周と外周とに表れる積層面には、鋼板の打ち抜き面が露出し、封止樹脂は、外周コアの前記積層面と接着される。 Here, the outer peripheral core can be configured by laminating coated steel plates. The coated steel sheet is manufactured, for example, by forming an insulating film for reducing eddy current loss on the surface of the silicon steel sheet, and then punching the silicon steel sheet into a specific shape. As a result, the punched surface of the steel plate is exposed on the laminated surfaces appearing on the inner and outer circumferences of the outer peripheral core, and the sealing resin is adhered to the laminated surface of the outer peripheral core.

ここで、例えばエポキシ樹脂からなる封止樹脂は、前述のように珪素鋼板を積層してなる外周コアに比べ、線膨張係数が大きい。そのため、点火コイルに温度変化が生じたとき、点火コイル内に外周コアと封止樹脂との間の線膨張係数差に起因して応力が生じ、封止樹脂にクラックが生じるおそれがある。 Here, for example, the sealing resin made of epoxy resin has a larger coefficient of linear expansion than the outer peripheral core formed by laminating silicon steel plates as described above. Therefore, when the temperature of the ignition coil changes, stress may occur in the ignition coil due to the difference in linear expansion coefficient between the outer peripheral core and the sealing resin, and the sealing resin may crack.

そこで、特許文献１に記載の点火コイルは、外周コアの表面に、封止樹脂に対する剥離性を有する剥離材を塗布している。これにより、点火コイルに温度変化が生じた場合であっても、封止樹脂と外周コアとを積極的に剥離させることで、外周コアと封止樹脂との間に応力が生じて封止樹脂にクラックが生じることを防止している。 Therefore, in the ignition coil described in Patent Document 1, a release material having peelability to the sealing resin is applied to the surface of the outer peripheral core. As a result, even when the temperature of the ignition coil changes, the sealing resin and the outer peripheral core are positively peeled off to generate stress between the outer peripheral core and the sealing resin, and the sealing resin is generated. Prevents cracks from occurring in the resin.

特開２００４−１６９６１９号公報Japanese Unexamined Patent Publication No. 2004-169619

しかしながら、特許文献１に記載の点火コイルにおいては、生産性の低下を招きやすい。すなわち、特許文献１に記載の点火コイルにおいては、外周コアに剥離材を塗布する工程、塗布した剥離材を乾燥させる工程、等が必要となり、生産性の低下を招きやすい。 However, the ignition coil described in Patent Document 1 tends to cause a decrease in productivity. That is, in the ignition coil described in Patent Document 1, a step of applying a release material to the outer peripheral core, a step of drying the applied release material, and the like are required, which tends to cause a decrease in productivity.

本発明は、かかる課題に鑑みてなされたものであり、生産性を向上させやすい点火コイルを提供しようとするものである。 The present invention has been made in view of the above problems, and an object of the present invention is to provide an ignition coil that can easily improve productivity.

本発明の一態様は、互いに磁気的に結合された一次コイル（１１）及び二次コイル（１２）と、
鋼板（３１）及び前記鋼板の表面を被覆する絶縁被膜（３２）を備えた複数の被覆鋼板（３）をコイル軸方向（Ｘ）に直交する積層方向（Ｚ）に積層してなり、前記一次コイル及び前記二次コイルの外周側に配された外周コア（２）と、
前記外周コアの内周に形成された内積層面（２ａ）と前記外周コアの外周に形成された外積層面（２ｂ）との少なくとも一方に対向し、前記被覆鋼板によって構成される対向被覆鋼板部（４）と、
前記一次コイル、前記二次コイル、前記対向被覆鋼板部、及び前記外周コアを封止する封止樹脂（１３）と、を備える点火コイル（１）にある。 One aspect of the present invention includes a primary coil (11) and a secondary coil (12) that are magnetically coupled to each other.
A plurality of coated steel plates (3) provided with a steel plate (31) and an insulating coating (32) covering the surface of the steel plate are laminated in a stacking direction (Z) orthogonal to the coil axial direction (X), and the primary The outer peripheral core (2) arranged on the outer peripheral side of the coil and the secondary coil, and
A facing coated steel sheet formed of the coated steel sheet, facing at least one of an inner laminated surface (2a) formed on the inner circumference of the outer peripheral core and an outer laminated surface (2b) formed on the outer periphery of the outer peripheral core. Part (4) and
The ignition coil (1) includes the primary coil, the secondary coil, the opposed coated steel plate portion, and a sealing resin (13) for sealing the outer peripheral core.

前記態様の点火コイルは、外周コアの内積層面と外積層面との少なくとも一方に対向し、被覆鋼板によって構成される対向被覆鋼板部を備える。それゆえ、点火コイルが高温から低温に変化したときであっても、対向被覆鋼板部の絶縁被膜と鋼板との間、或いは絶縁被膜と被覆樹脂との間が剥離することで、外周コアと封止樹脂との間に熱応力が生じることを抑制できる。それゆえ、封止樹脂にクラックが生じることを防止することができる。 The ignition coil of the above aspect includes a facing coated steel plate portion which faces at least one of the inner laminated surface and the outer laminated surface of the outer peripheral core and is composed of a coated steel plate. Therefore, even when the ignition coil changes from a high temperature to a low temperature, the outer peripheral core and the outer peripheral core are sealed by peeling between the insulating coating and the steel plate of the facing coated steel plate portion or between the insulating coating and the coating resin. It is possible to suppress the generation of thermal stress with the stop resin. Therefore, it is possible to prevent cracks from occurring in the sealing resin.

また、前記対向被覆鋼板部は、被覆鋼板によって構成されているため、点火コイルの生産性の向上を図りやすい。 Further, since the opposed coated steel plate portion is composed of the coated steel plate, it is easy to improve the productivity of the ignition coil.

以上のごとく、前記態様によれば、生産性を向上させやすい点火コイルを提供することができる。
なお、特許請求の範囲及び課題を解決する手段に記載した括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものであり、本発明の技術的範囲を限定するものではない。 As described above, according to the above aspect, it is possible to provide an ignition coil that can easily improve productivity.
The reference numerals in parentheses described in the scope of claims and the means for solving the problem indicate the correspondence with the specific means described in the embodiments described later, and limit the technical scope of the present invention. It's not a thing.

実施形態１における、点火コイルのＹ方向に直交する断面図。FIG. 5 is a cross-sectional view of the ignition coil orthogonal to the Y direction in the first embodiment. 実施形態１における、点火コイルのＺ方向に直交する断面図。FIG. 5 is a cross-sectional view of the ignition coil orthogonal to the Z direction in the first embodiment. 実施形態１における、外周コア、対向被覆鋼板部、中心コア、及び磁石体の斜視図。The perspective view of the outer peripheral core, the opposed coated steel plate part, the central core, and the magnet body in Embodiment 1. FIG. 実施形態１における、外周コア、対向被覆鋼板部、中心コア、及び磁石体の平面図。The plan view of the outer peripheral core, the opposed coated steel plate portion, the central core, and the magnet body in the first embodiment. 図４の、Ｖ−Ｖ線矢視断面図。FIG. 4 is a cross-sectional view taken along the line VV. 実施形態１における、外周コアの第一分割コアと第二分割コアの斜視図。The perspective view of the 1st division core and the 2nd division core of the outer peripheral core in Embodiment 1. FIG. 実施形態１における、対向被覆鋼板部を構成する一対の分割被覆鋼板の斜視図。1 is a perspective view of a pair of divided coated steel sheets constituting the opposed coated steel sheet portion according to the first embodiment. 実施形態１における、対向被覆鋼板部の絶縁被膜と鋼板との間が剥離した様子を示す、点火コイルの対向被覆鋼板部周辺の拡大断面図。1 is an enlarged cross-sectional view of the periphery of the facing coated steel plate portion of the ignition coil, showing a state in which the insulating coating of the facing coated steel plate portion and the steel plate are separated from each other in the first embodiment. 実施形態１における、対向被覆鋼板部の絶縁被膜と封止樹脂との間が剥離した様子を示す、点火コイルの対向被覆鋼板部周辺の拡大断面図。FIG. 5 is an enlarged cross-sectional view of the periphery of the facing coated steel plate portion of the ignition coil, showing a state in which the insulating coating of the facing coated steel plate portion and the sealing resin are peeled off in the first embodiment. 実施形態２における、外周コア、対向被覆鋼板部、中心コア、及び磁石体の斜視図。2 is a perspective view of the outer peripheral core, the opposed coated steel plate portion, the central core, and the magnet body in the second embodiment. 実施形態２における、対向被覆鋼板部を構成する一対の分割被覆鋼板の斜視図。2 is a perspective view of a pair of divided coated steel sheets constituting the opposed coated steel sheet portion in the second embodiment. 実施形態３における、対向被覆鋼板部を構成する一対の分割被覆鋼板の斜視図。FIG. 3 is a perspective view of a pair of divided coated steel sheets constituting the opposed coated steel sheet portion in the third embodiment. 実施形態４における、外周コアの斜視図。The perspective view of the outer peripheral core in Embodiment 4. 図１３の、XIV−XIV線矢視断面図。FIG. 13 is a cross-sectional view taken along the line XIV-XIV. 図１３の、XV−XV線矢視断面図。FIG. 13 is a cross-sectional view taken along the line XV-XV. 実施形態５における、外周コアの斜視図。The perspective view of the outer peripheral core in Embodiment 5. 図１６の、XVII−XVII線矢視断面図。FIG. 16 is a cross-sectional view taken along the line XVII-XVII. 実施形態６における、外周コアの斜視図。The perspective view of the outer peripheral core in Embodiment 6.

（実施形態１）
点火コイルの実施形態につき、図１〜図９を用いて説明する。
本実施形態の点火コイル１は、図１、図２に示すごとく、一次コイル１１、二次コイル１２、外周コア２、対向被覆鋼板部４、及び封止樹脂１３を備える。 (Embodiment 1)
An embodiment of the ignition coil will be described with reference to FIGS. 1 to 9.
As shown in FIGS. 1 and 2, the ignition coil 1 of the present embodiment includes a primary coil 11, a secondary coil 12, an outer peripheral core 2, an opposed coated steel plate portion 4, and a sealing resin 13.

一次コイル１１及び二次コイル１２は、互いに磁気的に結合されている。図３、図５に示すごとく、外周コア２は、複数の被覆鋼板３をコイル軸方向Ｘに直交する積層方向Ｚに積層してなる。図５に示すごとく、被覆鋼板３は、鋼板３１及び鋼板３１の両面を被覆する絶縁被膜３２を備える。図２に示すごとく、外周コア２は、一次コイル１１及び二次コイル１２の外周側に配されている。図１〜図５に示すごとく、対向被覆鋼板部４は、外周コア２の内周に形成された内積層面２ａに対向しており、被覆鋼板３によって構成されている。図１、図２に示すごとく、封止樹脂１３は、一次コイル１１、二次コイル１２、対向被覆鋼板部４、及び外周コア２を封止している。
以後、本実施形態につき詳説する。 The primary coil 11 and the secondary coil 12 are magnetically coupled to each other. As shown in FIGS. 3 and 5, the outer peripheral core 2 is formed by laminating a plurality of coated steel plates 3 in a laminating direction Z orthogonal to the coil axial direction X. As shown in FIG. 5, the coated steel sheet 3 includes the steel sheet 31 and the insulating coating 32 that covers both sides of the steel sheet 31. As shown in FIG. 2, the outer peripheral core 2 is arranged on the outer peripheral side of the primary coil 11 and the secondary coil 12. As shown in FIGS. 1 to 5, the opposed coated steel plate portion 4 faces the inner laminated surface 2a formed on the inner circumference of the outer peripheral core 2 and is composed of the coated steel plate 3. As shown in FIGS. 1 and 2, the sealing resin 13 seals the primary coil 11, the secondary coil 12, the facing coated steel plate portion 4, and the outer peripheral core 2.
Hereinafter, the present embodiment will be described in detail.

本明細書において、コイル軸方向Ｘは、一次コイル１１及び二次コイル１２の巻回軸が延在する方向である。以後、コイル軸方向ＸをＸ方向という。また、便宜上、Ｘ方向の一方側であって、後述の中心コア５における中心コア鍔部５２が形成された側を前方Ｘ１といい、その反対側を後方Ｘ２という。また、外周コア２の被覆鋼板３の積層方向ＺをＺ方向という。また、Ｘ方向とＺ方向との双方に直交する方向をＹ方向という。 In the present specification, the coil axial direction X is the direction in which the winding shafts of the primary coil 11 and the secondary coil 12 extend. Hereinafter, the coil axial direction X is referred to as the X direction. Further, for convenience, the side on one side in the X direction in which the central core flange portion 52 is formed in the central core 5 described later is referred to as a front X1, and the opposite side is referred to as a rear X2. Further, the laminating direction Z of the coated steel plate 3 of the outer peripheral core 2 is referred to as the Z direction. Further, a direction orthogonal to both the X direction and the Z direction is referred to as a Y direction.

本実施形態の点火コイル１は、例えば、自動車、コージェネレーション等の内燃機関に用いるものとすることができる。点火コイル１は、内燃機関に設置されるスパークプラグ（図示略）に接続され、スパークプラグに高電圧を印加する手段として用いられる。 The ignition coil 1 of the present embodiment can be used for, for example, an internal combustion engine of an automobile, cogeneration, or the like. The ignition coil 1 is connected to a spark plug (not shown) installed in an internal combustion engine, and is used as a means for applying a high voltage to the spark plug.

図２〜図４に示すごとく、外周コア２は、矩形環状を呈している。外周コア２は、互いにＸ方向に対向する前方辺部２１２及び後方辺部２２２と、前方辺部２１２及び後方辺部２２２のＹ方向の一端同士、及びＹ方向の他端同士をつなぐ一対の側方辺部２１１、２２１とを備える。一対の側方辺部２１１、２２１は、互いにＹ方向に対向している。なお、後述の第一分割コア２１の側方辺部に符号２１１を付し、後述の第二分割コア２２の側方辺部に符号２２１を付する。 As shown in FIGS. 2 to 4, the outer peripheral core 2 has a rectangular annular shape. The outer peripheral core 2 is a pair of sides connecting the front side portion 212 and the rear side portion 222 facing each other in the X direction, one ends of the front side portion 212 and the rear side portion 222 in the Y direction, and the other ends in the Y direction. The side portions 211 and 221 are provided. The pair of side sides 211 and 221 face each other in the Y direction. Reference numeral 211 is attached to the side side portion of the first division core 21 described later, and reference numeral 221 is attached to the side side portion of the second division core 22 described later.

図２〜図４、図６に示すごとく、外周コア２は、Ｚ方向から見た形状がＬ字状の第一分割コア２１と第二分割コア２２とを組み合わせてなる。第一分割コア２１は、前方辺部２１２及び一方の側方辺部２１１からなり、第二分割コア２２は、後方辺部２２２及び他方の側方辺部２２１からなる。第一分割コア２１と第二分割コア２２とは、互いに同等の形状を有する。 As shown in FIGS. 2, 4, and 6, the outer peripheral core 2 is formed by combining a first divided core 21 and a second divided core 22 having an L-shaped shape when viewed from the Z direction. The first split core 21 is composed of a front side portion 212 and one side side portion 211, and the second split core 22 is composed of a rear side portion 222 and the other side side portion 221. The first split core 21 and the second split core 22 have the same shape as each other.

図４、図６に示すごとく、第一分割コア２１は、前方辺部２１２における側方辺部２１１と反対側の端部に、Ｙ方向の端面の一部がＹ方向に突出した組付凸部２３を有する。また、第一分割コア２１は、側方辺部２１１における前方辺部２１２と反対側の端部に、Ｙ方向の端面の一部がＹ方向に凹んだ組付凹部２４を有する。 As shown in FIGS. 4 and 6, the first split core 21 has an assembled convex shape in which a part of the end face in the Y direction protrudes in the Y direction at the end of the front side portion 212 opposite to the side side portion 211. It has a part 23. Further, the first division core 21 has an assembly recess 24 in which a part of the end surface in the Y direction is recessed in the Y direction at the end of the side portion 211 opposite to the front side portion 212.

第二分割コア２２は、後方辺部２２２における側方辺部２２１と反対側の端部に、Ｙ方向の端面がＹ方向に突出した組付凸部２３を有する。また、第二分割コア２２は、側方辺部２２１における後方辺部２２２と反対側の端部に、Ｙ方向の端面の一部がＹ方向に凹んだ組付凹部２４を有する。 The second split core 22 has an assembled convex portion 23 whose end face in the Y direction protrudes in the Y direction at an end portion of the rear side portion 222 opposite to the side side portion 221. Further, the second split core 22 has an assembly recess 24 in which a part of the end face in the Y direction is recessed in the Y direction at the end of the side side portion 221 opposite to the rear side portion 222.

第一分割コア２１と第二分割コア２２とは、第一分割コア２１の組付凸部２３を第二分割コア２２の組付凹部２４に、第二分割コア２２の組付凸部２３を第一分割コア２１の組付凹部２４に、それぞれ嵌入して組み付けられている。第一分割コア２１と第二分割コア２２とのそれぞれは、Ｌ字状の被覆鋼板３をＺ方向に積層してなる。 The first division core 21 and the second division core 22 have the assembly convex portion 23 of the first division core 21 in the assembly recess 24 of the second division core 22, and the assembly convex portion 23 of the second division core 22. It is fitted and assembled in the assembly recess 24 of the first division core 21. Each of the first divided core 21 and the second divided core 22 is formed by laminating an L-shaped coated steel plate 3 in the Z direction.

図５に示すごとく、被覆鋼板３は、Ｚ方向に直交する平面状の鋼板３１と、鋼板３１の両面を被覆する絶縁被膜３２とを備える。被覆鋼板３は、例えば軟磁性材料の珪素鋼を板状に形成し、該板状の珪素鋼の表面処理をして珪素鋼の両面に絶縁被膜３２を形成し、その後、これをＬ字状に打ち抜くことで形成される。これにより、被覆鋼板３における鋼板３１の両面は絶縁被膜３２で覆われており、鋼板３１の端縁は、絶縁被膜３２から露出している。そのため、外周コア２の内周面を構成する内積層面２ａと、外周コア２の外周面を構成する外積層面２ｂとのそれぞれには、絶縁被膜３２から露出した鋼板３１の端縁部が表れる。そして、内積層面２ａを覆うように、対向被覆鋼板部４が配されている。 As shown in FIG. 5, the coated steel sheet 3 includes a flat steel sheet 31 orthogonal to the Z direction and an insulating coating 32 covering both sides of the steel sheet 31. In the coated steel plate 3, for example, silicon steel, which is a soft magnetic material, is formed into a plate shape, and the surface treatment of the plate-shaped silicon steel is performed to form an insulating coating 32 on both sides of the silicon steel, which is then L-shaped. It is formed by punching into. As a result, both sides of the steel sheet 31 in the coated steel sheet 3 are covered with the insulating film 32, and the edge of the steel sheet 31 is exposed from the insulating film 32. Therefore, the edge portion of the steel plate 31 exposed from the insulating coating 32 is provided on each of the inner laminated surface 2a forming the inner peripheral surface of the outer peripheral core 2 and the outer laminated surface 2b forming the outer peripheral surface of the outer peripheral core 2. appear. The facing coated steel plate portion 4 is arranged so as to cover the inner laminated surface 2a.

図１、図２に示すごとく、対向被覆鋼板部４は、外周コア２の内積層面２ａにおける中心コア５及び後述の磁石体１４から露出する面部の略全体を覆っている。図７に示すごとく、対向被覆鋼板部４は、外周コア２の周方向に分断された２つの分割被覆鋼板４１を組み合わせてなる。 As shown in FIGS. 1 and 2, the opposed coated steel plate portion 4 covers substantially the entire surface portion exposed from the central core 5 and the magnet body 14 described later on the inner laminated surface 2a of the outer peripheral core 2. As shown in FIG. 7, the opposed coated steel plate portion 4 is formed by combining two divided coated steel plates 41 divided in the circumferential direction of the outer peripheral core 2.

図４、図７に示すごとく、２つの分割被覆鋼板４１のそれぞれは、Ｚ方向から見た形状が、Ｙ方向に互いに向き合う方向に開口するＵ字状を呈している。すなわち、分割被覆鋼板４１は、Ｙ方向に直交する底面部４１１と、Ｘ方向における底面部４１１の両端からＹ方向における相手方の分割被覆鋼板４１側に突出したＸ方向に直交する側面部４１２とを有する。そして、２つの分割被覆鋼板４１は、側面部４１２における底面部４１１と反対側の端部同士を向かい合わせるように組み合わされており、全体的に筒状を呈している。 As shown in FIGS. 4 and 7, each of the two divided coated steel sheets 41 has a U shape in which the shape seen from the Z direction opens in the direction facing each other in the Y direction. That is, the split-coated steel sheet 41 has a bottom surface portion 411 orthogonal to the Y direction and a side surface portion 412 orthogonal to the X direction protruding from both ends of the bottom surface portion 411 in the X direction toward the other side of the split-coated steel sheet 41 in the Y direction. Have. The two divided coated steel sheets 41 are combined so that the ends of the side surface portion 412 opposite to the bottom surface portion 411 face each other, and have an overall tubular shape.

図７に示すごとく、各分割被覆鋼板４１の一対の側面部４１２は、底面部４１１と反対側の端部に、底面部４１１側に凹む凹部４１２ａを有する。そして、２つの分割被覆鋼板４１を組み合わせることにより、一方の分割被覆鋼板４１の凹部４１２ａと他方の分割被覆鋼板４１の凹部４１２ａとによって囲まれた穴部４１３が構成されている。図２に示すごとく、前方Ｘ１の穴部４１３には、後述の磁石体１４が挿入され、後方Ｘ２の穴部４１３には、中心コア５の後端部が挿入される。 As shown in FIG. 7, the pair of side surface portions 412 of each divided coated steel sheet 41 has a recess 412a recessed toward the bottom surface portion 411 at an end portion opposite to the bottom surface portion 411. Then, by combining the two divided coated steel sheets 41, a hole 413 surrounded by the recess 412a of one divided coated steel plate 41 and the recess 412a of the other divided coated steel plate 41 is formed. As shown in FIG. 2, a magnet body 14 described later is inserted into the hole 413 of the front X1, and the rear end of the central core 5 is inserted into the hole 413 of the rear X2.

２つの分割被覆鋼板４１における、互いに向き合う側面部４１２の端部同士の間は、若干の隙間が形成されている。すなわち、対向被覆鋼板部４には、穴部４１３のＺ方向の両端からＺ方向に形成され、対向被覆鋼板部４を穴部４１３の周方向に分断するスリット４１４が形成されている。 A slight gap is formed between the ends of the side surface portions 412 facing each other in the two divided coated steel sheets 41. That is, the facing coated steel plate portion 4 is formed with slits 414 formed in the Z direction from both ends of the hole portion 413 in the Z direction and dividing the facing coated steel plate portion 4 in the circumferential direction of the hole portion 413.

分割被覆鋼板４１は、外周コア２を構成する被覆鋼板３と同様のものからなる。分割被覆鋼板４１は、その厚みが内積層面２ａの法線方向となるよう配されている。そして、分割被覆鋼板は、その両面に、絶縁被膜３２が配されている。そして、図５に示すごとく、一対の分割被覆鋼板４１を組み合わせてなる対向被覆鋼板部４の内周面の全体は、絶縁被膜３２によって構成されている。そして、図２、図４に示すごとく、対向被覆鋼板部４の内周側に、中心コア５が配されている。 The divided coated steel plate 41 is made of the same material as the coated steel plate 3 constituting the outer peripheral core 2. The divided coated steel sheet 41 is arranged so that its thickness is in the normal direction of the inner laminated surface 2a. The divided coated steel sheet has insulating coatings 32 arranged on both sides thereof. Then, as shown in FIG. 5, the entire inner peripheral surface of the opposed coated steel plate portion 4 formed by combining the pair of divided coated steel plates 41 is composed of the insulating coating 32. Then, as shown in FIGS. 2 and 4, the central core 5 is arranged on the inner peripheral side of the opposed coated steel plate portion 4.

中心コア５は、外周コア２と共に閉磁路を形成する。中心コア５は、Ｘ方向に形成された直方体状の中心コア本体部５１と、中心コア本体部５１の前端からＹ方向の両側に突出した中心コア鍔部５２とを備え、全体としてＴ字状を呈している。 The central core 5 forms a closed magnetic path together with the outer peripheral core 2. The central core 5 includes a rectangular parallelepiped central core main body 51 formed in the X direction and a central core collar 52 protruding from the front end of the central core main body 51 on both sides in the Y direction, and has a T-shape as a whole. Is presenting.

中心コア５は、外周コア２を構成する被覆鋼板３と同様のものを、その厚み方向をＺ方向にした状態でＺ方向に積層してなる。図２に示すごとく、中心コア本体部５１の後端部は、対向被覆鋼板部４の後方Ｘ２の穴部４１３に配される。また、中心コア５の前面と外周コア２との間には、磁石体１４が配されている。 The central core 5 is formed by laminating the same material as the coated steel plate 3 constituting the outer peripheral core 2 in the Z direction with the thickness direction being the Z direction. As shown in FIG. 2, the rear end portion of the central core main body portion 51 is arranged in the hole portion 413 of the rear X2 of the opposed coated steel plate portion 4. Further, a magnet body 14 is arranged between the front surface of the central core 5 and the outer peripheral core 2.

Ｘ方向から見たとき、磁石体１４の大きさは、中心コア５の前面の大きさと同等である。磁石体１４は、中心コア５の前面の全体に重なるよう配されている。磁石体１４は、点火コイル１の出力電圧の向上のため、中心コア５に磁気バイアスをかけ、一次コイル１１への通電の遮断時の磁束の変化量を大きくして、二次コイル１２に誘起される電圧を高めるためのものである。磁石体１４は、対向被覆鋼板部４の前方Ｘ１の穴部４１３に配されている。 When viewed from the X direction, the size of the magnet body 14 is equivalent to the size of the front surface of the central core 5. The magnet body 14 is arranged so as to overlap the entire front surface of the central core 5. In order to improve the output voltage of the ignition coil 1, the magnet body 14 applies a magnetic bias to the central core 5 to increase the amount of change in the magnetic flux when the energization of the primary coil 11 is cut off, and induces the magnet body 14 in the secondary coil 12. It is for increasing the voltage to be applied. The magnet body 14 is arranged in the hole portion 413 of the front X1 of the opposed coated steel plate portion 4.

中心コア５の外周側に、一次コイル１１及び二次コイル１２が同芯状に巻回されている。図１、図２に示すごとく、一次コイル１１は、中心コア５を覆うよう形成された一次ボビン１５に巻回されている。 The primary coil 11 and the secondary coil 12 are wound concentrically on the outer peripheral side of the central core 5. As shown in FIGS. 1 and 2, the primary coil 11 is wound around a primary bobbin 15 formed so as to cover the central core 5.

一次ボビン１５は、例えばポリブチレンテレフタレート樹脂（すなわちＰＢＴ樹脂）からなる。一次ボビン１５は、その成形型に中心コア５を配置したインサート成形により、形成されている。これにより、一次ボビン１５は、中心コア５と一体的に形成されている。一次ボビン１５における中心コア本体部５１を覆う部位に、一次コイル１１が巻回されている。そして、一次コイル１１の外周側に二次コイル１２が配されている。 The primary bobbin 15 is made of, for example, a polybutylene terephthalate resin (that is, a PBT resin). The primary bobbin 15 is formed by insert molding in which the central core 5 is arranged in the molding die. As a result, the primary bobbin 15 is integrally formed with the central core 5. The primary coil 11 is wound around a portion of the primary bobbin 15 that covers the central core main body 51. The secondary coil 12 is arranged on the outer peripheral side of the primary coil 11.

二次コイル１２は、一次コイル１１の外周側に配された二次ボビン１６に配されている。二次ボビン１６は、例えばＰＢＴ樹脂からなる。二次ボビン１６は筒状を呈しており、その内側に中心コア本体部５１や一次コイル１１を挿入している。 The secondary coil 12 is arranged on the secondary bobbin 16 arranged on the outer peripheral side of the primary coil 11. The secondary bobbin 16 is made of, for example, a PBT resin. The secondary bobbin 16 has a tubular shape, and the central core main body 51 and the primary coil 11 are inserted inside the secondary bobbin 16.

外周コア２の前方Ｘ１には、イグナイタ１７が配されている。イグナイタ１７は、一次コイル１１への通電、及びその遮断の制御を行う。そして、これら点火コイル１を構成する部品は、ケース６内に収容されている。 An igniter 17 is arranged at the front X1 of the outer peripheral core 2. The igniter 17 controls energization of the primary coil 11 and disconnection thereof. The parts constituting the ignition coil 1 are housed in the case 6.

ケース６は、点火コイル１の構成部品を収容するケース本体部６１を備える。ケース本体部６１は、Ｚ方向の一方側が開放されている。また、図１に示すごとく、ケース６は、ケース本体部６１から、ケース本体部６１の開放側と反対側に突出する筒状の高圧タワー部６２を有する。 The case 6 includes a case body 61 that houses the components of the ignition coil 1. One side of the case body 61 in the Z direction is open. Further, as shown in FIG. 1, the case 6 has a tubular high-pressure tower portion 62 projecting from the case main body portion 61 to the side opposite to the open side of the case main body portion 61.

ケース６単体を見たとき、高圧タワー部６２の内部空間は、ケース本体部６１の内部空間と連通している。そして、点火コイル１において、高圧タワー部６２内には、金属製の高圧出力端子１８が嵌入されている。これにより、高圧タワー部６２におけるケース本体部６１側の端部は閉塞されている。高圧出力端子１８は、ケース本体部６１から高圧タワー部６２側に、ケース６内の封止樹脂１３が漏れ出ないようにする役割や、点火コイル１の出力端子としての役割を有する。そして、ケース本体部６１内に封止樹脂１３が充填されている。 When looking at the case 6 alone, the internal space of the high-pressure tower portion 62 communicates with the internal space of the case main body portion 61. Then, in the ignition coil 1, a metal high-voltage output terminal 18 is fitted in the high-voltage tower portion 62. As a result, the end portion of the high-pressure tower portion 62 on the case body portion 61 side is closed. The high-voltage output terminal 18 has a role of preventing the sealing resin 13 in the case 6 from leaking from the case main body 61 to the high-voltage tower 62 side, and a role as an output terminal of the ignition coil 1. Then, the case main body 61 is filled with the sealing resin 13.

封止樹脂１３は、例えばエポキシ樹脂からなる。封止樹脂１３は、点火コイル１を構成する一次コイル１１、二次コイル１２、一次ボビン１５、二次ボビン１６、中心コア５、外周コア２、イグナイタ１７等の部品を封止している。 The sealing resin 13 is made of, for example, an epoxy resin. The sealing resin 13 seals parts such as the primary coil 11, the secondary coil 12, the primary bobbin 15, the secondary bobbin 16, the central core 5, the outer peripheral core 2, and the igniter 17 that make up the ignition coil 1.

ケース本体部６１の前端部には、点火コイル１を外部機器に接続するためのコネクタ７が嵌合されている。コネクタ７は、一次ボビン１５と一体成形されている。なお、図２においては、コネクタ７における相手方コネクタとの接続部の図示を省略している。なお、コネクタ７は、一次ボビン１５と別体に形成されていてもよい。 A connector 7 for connecting the ignition coil 1 to an external device is fitted to the front end of the case body 61. The connector 7 is integrally molded with the primary bobbin 15. In FIG. 2, the connection portion of the connector 7 with the other party connector is not shown. The connector 7 may be formed separately from the primary bobbin 15.

次に、本実施形態の作用効果につき説明する。
本実施形態の点火コイル１は、外周コア２の内積層面２ａに対向し、被覆鋼板３によって構成される対向被覆鋼板部４を備える。それゆえ、点火コイル１が高温から低温に変化したときであっても、対向被覆鋼板部４の絶縁被膜３２と鋼板３１との間、或いは絶縁被膜３２と被覆樹脂との間が剥離することで、外周コア２と封止樹脂１３との間に熱応力が生じることを抑制できる。 Next, the action and effect of this embodiment will be described.
The ignition coil 1 of the present embodiment includes an opposed coated steel plate portion 4 which faces the inner laminated surface 2a of the outer peripheral core 2 and is composed of a coated steel plate 3. Therefore, even when the ignition coil 1 changes from a high temperature to a low temperature, the insulating coating 32 and the steel plate 31 of the facing coated steel plate portion 4 or the insulating coating 32 and the coating resin are separated from each other. It is possible to suppress the generation of thermal stress between the outer peripheral core 2 and the sealing resin 13.

すなわち、点火コイル１周辺の温度が高温から低温に変化したとき、線膨張係数が比較的小さい外周コア２は、熱収縮量が小さい一方で、線膨張係数が比較的大きい封止樹脂１３は大きく収縮する。それゆえ、外周コア２と封止樹脂１３との間において、応力が生じ得る。 That is, when the temperature around the ignition coil 1 changes from high temperature to low temperature, the outer peripheral core 2 having a relatively small coefficient of linear expansion has a small amount of heat shrinkage, while the sealing resin 13 having a relatively large coefficient of linear expansion has a large amount. Shrink. Therefore, stress may occur between the outer peripheral core 2 and the sealing resin 13.

当該応力により、例えば図８に示すごとく、対向被覆鋼板部４の絶縁被膜３２と鋼板３１との間が剥離して隙間ｃが発生し、封止樹脂１３が外周コア２に拘束され難くなる。あるいは、当該応力により、例えば図９に示すごとく、絶縁被膜３２と封止樹脂１３との間が剥離して隙間ｃが発生し、封止樹脂１３が外周コア２に拘束され難くなる。 Due to the stress, for example, as shown in FIG. 8, the insulating coating 32 of the opposed coated steel plate portion 4 and the steel plate 31 are separated from each other to generate a gap c, and the sealing resin 13 is less likely to be restrained by the outer peripheral core 2. Alternatively, due to the stress, for example, as shown in FIG. 9, the insulating film 32 and the sealing resin 13 are separated from each other to generate a gap c, and the sealing resin 13 is less likely to be restrained by the outer peripheral core 2.

そのため、点火コイル１が高温から低温に変化したときであっても、外周コア２と封止樹脂１３との間において応力が集中することを防止することができる。その結果、外周コア２と封止樹脂１３との間から封止樹脂１３内部にクラックが生じることを防止することができる。 Therefore, even when the ignition coil 1 changes from a high temperature to a low temperature, it is possible to prevent stress from concentrating between the outer peripheral core 2 and the sealing resin 13. As a result, it is possible to prevent cracks from occurring inside the sealing resin 13 between the outer peripheral core 2 and the sealing resin 13.

また、対向被覆鋼板部４は、外周コア２を構成する被覆鋼板３と同様の被覆鋼板３によって構成される。それゆえ、外周コア２と対向被覆鋼板部４とを形成するために別部材を準備する必要がなく、点火コイル１の生産性の向上を図りやすい。また、外周コア２に剥離材を塗布する場合に要する、外周コアに剥離材を塗布する工程、塗布した剥離材を乾燥させる工程が、本実施形態では不要となる。これによっても、点火コイル１の生産性の向上を図ることができる。 Further, the opposed coated steel plate portion 4 is composed of a coated steel plate 3 similar to the coated steel plate 3 constituting the outer peripheral core 2. Therefore, it is not necessary to prepare a separate member for forming the outer peripheral core 2 and the facing coated steel plate portion 4, and it is easy to improve the productivity of the ignition coil 1. Further, the step of applying the release material to the outer peripheral core and the step of drying the applied release material, which are required when applying the release material to the outer peripheral core 2, are not required in this embodiment. This also makes it possible to improve the productivity of the ignition coil 1.

また、対向被覆鋼板部４は、少なくとも外周コア２の内積層面２ａに対向している。それゆえ、封止樹脂１３の外周コア２の内側の領域に、クラックが生じることを防止することができる。これにより、外周コア２と二次コイル１２との間の電気的絶縁性が低下することを防止することができる。 Further, the facing coated steel plate portion 4 faces at least the inner laminated surface 2a of the outer peripheral core 2. Therefore, it is possible to prevent cracks from occurring in the inner region of the outer peripheral core 2 of the sealing resin 13. As a result, it is possible to prevent the electrical insulation between the outer peripheral core 2 and the secondary coil 12 from being lowered.

また、対向被覆鋼板部４は、中心コア５とＸ方向に対向する全部位に、Ｘ方向に貫通する穴部４１３を有する。それゆえ、中心コア５に出入りする磁束が対向被覆鋼板部４をその厚み方向に通過して対向被覆鋼板部４に渦電流が生じることによる渦電流損を低減することができる。これにより、点火コイル１の出力電圧が低下することを防止できる。 Further, the opposed coated steel plate portion 4 has a hole portion 413 penetrating in the X direction in all the portions facing the central core 5 in the X direction. Therefore, it is possible to reduce the eddy current loss due to the magnetic flux entering and exiting the central core 5 passing through the facing coated steel plate portion 4 in the thickness direction thereof and generating an eddy current in the facing coated steel plate portion 4. This makes it possible to prevent the output voltage of the ignition coil 1 from dropping.

また、対向被覆鋼板部４には、穴部４１３から穴部４１３の外周側に形成されるとともに対向被覆鋼板部４を穴部４１３の周方向に分断するスリット４１４が形成されている。それゆえ、対向被覆鋼板部４における穴部４１３の周囲に、ループ状の渦電流が生じることに起因する渦電流損を低減することができる。これによっても、点火コイル１の出力電圧が低下することを防止することができる。 Further, the facing coated steel plate portion 4 is formed with a slit 414 formed from the hole portion 413 to the outer peripheral side of the hole portion 413 and dividing the facing coated steel plate portion 4 in the circumferential direction of the hole portion 413. Therefore, it is possible to reduce the eddy current loss caused by the generation of a loop-shaped eddy current around the hole 413 in the opposed coated steel plate portion 4. This also prevents the output voltage of the ignition coil 1 from dropping.

以上のごとく、本実施形態によれば、生産性を向上させやすい点火コイルを提供することができる。 As described above, according to the present embodiment, it is possible to provide an ignition coil that can easily improve productivity.

（実施形態２）
本実施形態は、図１０、図１１に示すごとく、実施形態１に対して、対向被覆鋼板部４を変更した実施形態である。本実施形態において、対向被覆鋼板部４の全体形状は実施形態１と同様であるが、対向被覆鋼板部４を構成する分割被覆鋼板４１の形状が実施形態１のものと異なる。 (Embodiment 2)
As shown in FIGS. 10 and 11, the present embodiment is an embodiment in which the opposed coated steel plate portion 4 is modified from the first embodiment. In the present embodiment, the overall shape of the facing coated steel plate portion 4 is the same as that of the first embodiment, but the shape of the divided coated steel plate 41 constituting the facing coated steel plate portion 4 is different from that of the first embodiment.

図１１に示すごとく、対向被覆鋼板部４を構成する２つの分割被覆鋼板４１のそれぞれは、Ｚ方向から見た形状が、Ｘ方向に互いに向き合う方向に開口するＵ字状を呈している。すなわち、分割被覆鋼板４１は、Ｘ方向に直交する底面部４１１と、Ｙ方向における底面部４１１の両端からＸ方向における相手方の分割被覆鋼板４１側に突出したＸ方向に直交する側面部４１２とを有する。そして、２つの分割被覆鋼板４１は、側面部４１２における底面部４１１と反対側の端部同士を向かい合わせるように組み合わされており、全体的に筒状を呈している。分割被覆鋼板４１の底面部４１１に、底面部４１１をＸ方向に貫通する穴部４１３が形成されている。 As shown in FIG. 11, each of the two divided coated steel sheets 41 constituting the opposed coated steel plate portion 4 has a U shape in which the shape seen from the Z direction opens in the direction facing each other in the X direction. That is, the split-coated steel sheet 41 has a bottom surface portion 411 orthogonal to the X direction and a side surface portion 412 orthogonal to the X direction protruding from both ends of the bottom surface portion 411 in the Y direction toward the other side of the split-coated steel sheet 41 in the X direction. Have. The two divided coated steel sheets 41 are combined so that the ends of the side surface portion 412 opposite to the bottom surface portion 411 face each other, and have an overall tubular shape. A hole 413 that penetrates the bottom surface portion 411 in the X direction is formed in the bottom surface portion 411 of the split-coated steel plate 41.

その他は、実施形態１と同様である。
なお、実施形態２以降において用いた符号のうち、既出の実施形態において用いた符号と同一のものは、特に示さない限り、既出の実施形態におけるものと同様の構成要素等を表す。
本実施形態においても、実施形態１と同様の作用効果を有する。 Others are the same as in the first embodiment.
In addition, among the codes used in the second and subsequent embodiments, the same codes as those used in the above-described embodiments represent the same components and the like as those in the above-mentioned embodiments, unless otherwise specified.
The present embodiment also has the same action and effect as that of the first embodiment.

（実施形態３）
本実施形態は、図１２に示すごとく、実施形態２に対して、分割被覆鋼板４１にスリット４１４を設けた実施形態である。 (Embodiment 3)
As shown in FIG. 12, the present embodiment is an embodiment in which the slit 414 is provided in the divided coated steel plate 41 with respect to the second embodiment.

スリット４１４は、実施形態１で説明したように、分割被覆鋼板４１の穴部４１３から穴部４１３の外周側に形成されており、分割被覆鋼板４１を穴部４１３の周方向に分断する。スリット４１４は、分割被覆鋼板４１の穴部４１３の周囲において、周方向の一カ所に形成されている。すなわち、スリット４１４は、穴部４１３からＺ方向の一方側にのみ形成されている。そして、穴部４１３におけるＺ方向の他方側は、分割被覆鋼板４１の一部が形成されており、スリット４１４は形成されていない。
その他は、実施形態２と同様である。 As described in the first embodiment, the slit 414 is formed from the hole 413 of the split-coated steel plate 41 to the outer peripheral side of the hole 413, and divides the split-coated steel plate 41 in the circumferential direction of the hole 413. The slit 414 is formed at one place in the circumferential direction around the hole 413 of the divided coated steel plate 41. That is, the slit 414 is formed only on one side in the Z direction from the hole 413. A part of the divided coated steel plate 41 is formed on the other side of the hole 413 in the Z direction, and the slit 414 is not formed.
Others are the same as in the second embodiment.

本実施形態においては、分割被覆鋼板４１にスリット４１４が設けられているため、対向被覆鋼板部４における穴部４１３の周囲に、ループ状の渦電流が生じることに起因する渦電流損を低減することができる。これによって、点火コイル１の出力電圧が低下することを防止することができる。
その他、実施形態２と同様の作用効果を有する。 In the present embodiment, since the slit 414 is provided in the divided coated steel plate 41, the eddy current loss caused by the generation of a loop-shaped eddy current around the hole 413 in the opposed coated steel plate portion 4 is reduced. be able to. This makes it possible to prevent the output voltage of the ignition coil 1 from dropping.
In addition, it has the same action and effect as in the second embodiment.

（実施形態４）
本実施形態は、図１３〜図１５に示すごとく、外周コア２を構成する少なくとも一つの被覆鋼板３である特定被覆鋼板３０の一部によって対向被覆鋼板部４を構成した実施形態である。 (Embodiment 4)
As shown in FIGS. 13 to 15, the present embodiment is an embodiment in which the facing coated steel plate portion 4 is configured by a part of the specific coated steel plate 30 which is at least one coated steel plate 3 constituting the outer peripheral core 2.

本実施形態においては、第一分割コア２１のＺ方向の一端の被覆鋼板３と、第二分割コア２２のＺ方向の一端の被覆鋼板３とが、特定被覆鋼板３０を構成している。 In the present embodiment, the coated steel plate 3 at one end in the Z direction of the first divided core 21 and the coated steel plate 3 at one end in the Z direction of the second divided core 22 constitute the specified coated steel plate 30.

図１３、図１５に示すごとく、第一分割コア２１の特定被覆鋼板３０は、側方辺部２１１を構成する部位からＹ方向における外周コア２の内側に対向被覆鋼板部４が延設されている。第一分割コア２１の特定被覆鋼板３０は、側方辺部２１１を構成する部位に対して、対向被覆鋼板部４が折り曲げられている。そして、対向被覆鋼板部４は、第一分割コア２１の側方辺部２１１の内積層面２ａに対向する位置に配されている。第一分割コア２１において、対向被覆鋼板部４は、側方辺部２１１の内積層面２ａの略全体にＹ方向に対向している。 As shown in FIGS. 13 and 15, in the specific coated steel plate 30 of the first division core 21, the opposed coated steel plate portion 4 extends from the portion constituting the side side portion 211 to the inside of the outer peripheral core 2 in the Y direction. There is. In the specific coated steel plate 30 of the first division core 21, the opposed coated steel plate portion 4 is bent with respect to the portion constituting the side side portion 211. The facing coated steel plate portion 4 is arranged at a position facing the inner laminated surface 2a of the side side portion 211 of the first division core 21. In the first division core 21, the opposed coated steel plate portion 4 faces substantially the entire inner laminated surface 2a of the side side portion 211 in the Y direction.

第二分割コア２２の特定被覆鋼板３０は、側方辺部２２１を構成する部位からＹ方向における外周コア２の内側に対向被覆鋼板部４が延設されている。第二分割コア２２の特定被覆鋼板３０は、側方辺部２２１を構成する部位に対して、対向被覆鋼板部４が折り曲げられている。そして、対向被覆鋼板部４は、第二分割コア２２の側方辺部２２１の内積層面２ａに対向する位置に配されている。図１４に示すごとく、第二分割コア２２において、対向被覆鋼板部４は、側方辺部２２１の内積層面２ａの略全体にＹ方向に対向している。 In the specific coated steel plate 30 of the second divided core 22, the opposed coated steel plate portion 4 extends from the portion constituting the side side portion 221 to the inside of the outer peripheral core 2 in the Y direction. In the specific coated steel plate 30 of the second divided core 22, the facing coated steel plate portion 4 is bent with respect to the portion constituting the side side portion 221. The facing coated steel plate portion 4 is arranged at a position facing the inner laminated surface 2a of the side side portion 221 of the second divided core 22. As shown in FIG. 14, in the second divided core 22, the facing coated steel plate portion 4 faces substantially the entire inner laminated surface 2a of the side side portion 221 in the Y direction.

本実施形態においては、第一分割コア２１と第二分割コア２２とは、Ｚ方向の互いに同じ側の端部に、特定被覆鋼板３０が形成されているが、これに限られない。そして、前方辺部２１２及び後方辺部２２２の内積層面２ａには、これらに対向する対向被覆鋼板部４は形成されていない。 In the present embodiment, the first-divided core 21 and the second-divided core 22 have the specific coated steel plate 30 formed at the ends on the same side in the Z direction, but the present invention is not limited to this. The inner laminated surface 2a of the front side portion 212 and the rear side portion 222 is not formed with the facing coated steel plate portion 4 facing them.

図１５に示すごとく、対向被覆鋼板部４は、内積層面２ａの法線方向に、絶縁被膜３２と鋼板３１とが積層されている。そして、対向被覆鋼板部４における外周コア２の内側の面は、絶縁被膜３２によって構成されている。
その他は、実施形態１と同様である。 As shown in FIG. 15, in the facing coated steel plate portion 4, the insulating coating 32 and the steel plate 31 are laminated in the normal direction of the inner laminated surface 2a. The inner surface of the outer peripheral core 2 of the opposed coated steel plate portion 4 is formed of an insulating coating 32.
Others are the same as in the first embodiment.

本実施形態において、対向被覆鋼板部４は、外周コア２を構成する少なくとも一つの被覆鋼板３である特定被覆鋼板３０の一部によって構成されており、特定被覆鋼板３０は、対向被覆鋼板部４が外周コア２の内積層面２ａに対向する位置に配されるよう折り曲げられた形状を有する。すなわち、対向被覆鋼板部４は、外周コア２の一部によって構成されているため、部品点数の削減を図りやすい。また、外周コア２を構成する被覆鋼板３の一つである特定被覆鋼板３０の一部を折り曲げることで対向被覆鋼板部４を形成することができるため、点火コイル１の生産性の向上を図りやすい。 In the present embodiment, the opposed coated steel plate portion 4 is composed of a part of the specific coated steel plate 30 which is at least one coated steel plate 3 constituting the outer peripheral core 2, and the specific coated steel plate 30 is the opposed coated steel plate portion 4. Has a bent shape so as to be arranged at a position facing the inner laminated surface 2a of the outer peripheral core 2. That is, since the opposed coated steel plate portion 4 is composed of a part of the outer peripheral core 2, it is easy to reduce the number of parts. Further, since the facing coated steel plate portion 4 can be formed by bending a part of the specific coated steel plate 30 which is one of the coated steel plates 3 constituting the outer peripheral core 2, the productivity of the ignition coil 1 is improved. Cheap.

また、特定被覆鋼板３０は、外周コア２のＺ方向の端部に配された被覆鋼板３である。それゆえ、特定被覆鋼板３０の一部をＺ方向の一方側に折り曲げることで、対向被覆鋼板部４を外周コア２の内積層面２ａのＺ方向の略全体を覆う位置に配することができる。
その他、実施形態１と同様である。 Further, the specific coated steel plate 30 is a coated steel plate 3 arranged at the end portion of the outer peripheral core 2 in the Z direction. Therefore, by bending a part of the specific coated steel sheet 30 to one side in the Z direction, the opposed coated steel sheet portion 4 can be arranged at a position that covers substantially the entire inner laminated surface 2a of the outer peripheral core 2 in the Z direction. ..
Others are the same as in the first embodiment.

（実施形態５）
本実施形態は、図１６、図１７に示すごとく、実施形態４と基本構造を同様にしつつ、前方辺部２１２及び後方辺部２２２の内積層面２ａにも対向被覆鋼板部４を対向させた実施形態である。 (Embodiment 5)
As shown in FIGS. 16 and 17, the present embodiment has the same basic structure as that of the fourth embodiment, and the facing coated steel plate portion 4 is opposed to the inner laminated surface 2a of the front side portion 212 and the rear side portion 222. It is an embodiment.

図１６に示すごとく、本実施形態においては、第一分割コア２１のＺ方向の両端の被覆鋼板３と、第二分割コア２２のＺ方向の両端の被覆鋼板３とが、対向被覆鋼板部４を備えた特定被覆鋼板３０を構成している。 As shown in FIG. 16, in the present embodiment, the coated steel plates 3 at both ends of the first divided core 21 in the Z direction and the coated steel plates 3 at both ends of the second divided core 22 in the Z direction are opposed to each other. Consists of the specific coated steel sheet 30 provided with.

第一分割コア２１は、側方辺部２１１の内積層面２ａの略全体に対向する対向被覆鋼板部４である第一内側対向部４０ａと、前方辺部２１２の内積層面２ａの略全体に対向する対向被覆鋼板部４である第二内側対向部４０ｂとを備える。 The first division core 21 includes a first inner facing portion 40a which is a facing coated steel plate portion 4 facing substantially the entire inner laminated surface 2a of the side side portion 211, and substantially the entire inner laminated surface 2a of the front side portion 212. It is provided with a second inner facing portion 40b, which is a facing coated steel plate portion 4 facing the surface.

第一内側対向部４０ａは、第一分割コア２１のＺ方向の一端に配された特定被覆鋼板３０における側方辺部２１１を構成する部位から、Ｙ方向における外周コア２の内側に向かって延設されている。図１６に示すごとく、第二内側対向部４０ｂは、第一分割コア２１のＺ方向の他端に配された特定被覆鋼板３０における前方辺部２１２を構成する部位から、後方Ｘ２に向かって延設されている。第一分割コア２１における一対の特定被覆鋼板３０のそれぞれは、対向被覆鋼板部４が第一分割コア２１の内積層面２ａに対向する位置に配されるよう折り曲げられた形状を有する。 The first inner facing portion 40a extends toward the inside of the outer peripheral core 2 in the Y direction from a portion constituting the side side portion 211 of the specific coated steel sheet 30 arranged at one end of the first divided core 21 in the Z direction. It is installed. As shown in FIG. 16, the second inner facing portion 40b extends toward the rear X2 from the portion constituting the front side portion 212 of the specific coated steel sheet 30 arranged at the other end of the first division core 21 in the Z direction. It is installed. Each of the pair of specified coated steel plates 30 in the first divided core 21 has a shape bent so that the opposed coated steel plate portion 4 is arranged at a position facing the inner laminated surface 2a of the first divided core 21.

図１６、図１７に示すごとく、第二分割コア２２は、側方辺部２２１の内積層面２ａの略全体に対向する対向被覆鋼板部４である第三内側対向部４０ｃと、後方辺部２２２の内積層面２ａの略全体に対向する対向被覆鋼板部４である第四内側対向部４０ｄとを備える。 As shown in FIGS. 16 and 17, the second split core 22 has a third inner facing portion 40c, which is a facing coated steel plate portion 4 facing substantially the entire inner laminated surface 2a of the side side portion 221 and a rear side portion. It is provided with a fourth inner facing portion 40d, which is a facing coated steel plate portion 4 facing substantially the entire inner laminated surface 2a of 222.

第三内側対向部４０ｃは、第二分割コア２２のＺ方向の一端に配された特定被覆鋼板３０における側方辺部２２１を構成する部位から、Ｙ方向における外周コア２の内側に向かって延設されている。第四内側対向部４０ｄは、第二分割コア２２のＺ方向の他端に配された特定被覆鋼板３０における後方辺部２２２を構成する部位から、前方Ｘ１に向かって延設されている。第二分割コア２２における一対の特定被覆鋼板３０のそれぞれは、対向被覆鋼板部４が第二分割コア２２の内積層面２ａに対向する位置に配されるよう折り曲げられた形状を有する。 The third inner facing portion 40c extends inward of the outer peripheral core 2 in the Y direction from a portion constituting the side side portion 221 of the specific coated steel sheet 30 arranged at one end of the second divided core 22 in the Z direction. It is installed. The fourth inner facing portion 40d extends toward the front X1 from a portion constituting the rear side portion 222 of the specific coated steel plate 30 arranged at the other end of the second divided core 22 in the Z direction. Each of the pair of specified coated steel plates 30 in the second divided core 22 has a shape bent so that the opposed coated steel plate portion 4 is arranged at a position facing the inner laminated surface 2a of the second divided core 22.

図１７に示すごとく、対向被覆鋼板部４は、内積層面２ａの法線方向に、絶縁被膜３２と鋼板３１とが積層されている。そして、対向被覆鋼板部４における外周コア２の内側の面は、絶縁被膜３２によって構成されている。
その他は、実施形態４と同様である。 As shown in FIG. 17, in the facing coated steel plate portion 4, the insulating coating 32 and the steel plate 31 are laminated in the normal direction of the inner laminated surface 2a. The inner surface of the outer peripheral core 2 of the opposed coated steel plate portion 4 is formed of an insulating coating 32.
Others are the same as in the fourth embodiment.

本実施形態においては、第一分割コア２１におけるＺ方向の一端の特定被覆鋼板３０に、側方辺部２１１の内積層面２ａに対向する第一内側対向部４０ａを形成し、第一分割コア２１におけるＺ方向の他端の特定被覆鋼板３０に、前方辺部２１２の内積層面２ａに対向する第二内側対向部４０ｂを形成している。それゆえ、第一分割コア２１において、Ｚ方向の一端に配された１つの被覆鋼板３に、第一内側対向部４０ａと第二内側対向部４０ｂとの双方を形成する場合よりも、側方対向部と第二内側対向部４０ｂとを容易に形成することができる。 In the present embodiment, the first inner facing portion 40a facing the inner laminated surface 2a of the side side portion 211 is formed on the specific coated steel plate 30 at one end in the Z direction of the first split core 21 to form the first split core. A second inner facing portion 40b facing the inner laminated surface 2a of the front side portion 212 is formed on the specified coated steel plate 30 at the other end in the Z direction of 21. Therefore, in the first split core 21, it is more lateral than the case where both the first inner facing portion 40a and the second inner facing portion 40b are formed on one coated steel plate 3 arranged at one end in the Z direction. The facing portion and the second inner facing portion 40b can be easily formed.

一方で、第一分割コア２１のＺ方向の一端に配された１つの被覆鋼板３に、第一内側対向部４０ａと第二内側対向部４０ｂとの双方を形成することは、製造上困難である。この場合、Ｚ方向の一端の被覆鋼板３に、側方辺部２１１からＸ方向における外周コア２の内側に延設する部位と、前方辺部２１２からＹ方向に外周コア２の内側に延設する部位とを形成する必要があるが、この部位同士が重なるため、製造が難しい。 On the other hand, it is difficult in manufacturing to form both the first inner facing portion 40a and the second inner facing portion 40b on one coated steel plate 3 arranged at one end of the first divided core 21 in the Z direction. is there. In this case, on the coated steel plate 3 at one end in the Z direction, a portion extending from the side side portion 211 to the inside of the outer peripheral core 2 in the X direction and a portion extending from the front side portion 212 to the inside of the outer peripheral core 2 in the Y direction. It is necessary to form a part to be formed, but it is difficult to manufacture because these parts overlap each other.

第二分割コア２２も、第一分割コア２１と同様の構成であり、第一分割コア２１と同様の効果が得られる。
その他、実施形態４と同様の作用効果を有する。 The second split core 22 also has the same configuration as the first split core 21, and the same effect as that of the first split core 21 can be obtained.
In addition, it has the same action and effect as in the fourth embodiment.

（実施形態６）
本実施形態は、図１８に示すごとく、基本構成を実施形態４と同様としつつ、外周コア２の外積層面２ｂに対向する対向被覆鋼板部４を形成した実施形態である。 (Embodiment 6)
As shown in FIG. 18, the present embodiment is an embodiment in which the facing coated steel plate portion 4 facing the outer laminated surface 2b of the outer peripheral core 2 is formed while the basic configuration is the same as that of the fourth embodiment.

本実施形態においては、第一分割コア２１のＺ方向の一端の被覆鋼板３と、第二分割コア２２のＺ方向の一端の被覆鋼板３とが、対向被覆鋼板部４を備えた特定被覆鋼板３０を構成している。 In the present embodiment, the coated steel plate 3 at one end in the Z direction of the first divided core 21 and the coated steel plate 3 at one end in the Z direction of the second divided core 22 are specified coated steel plates provided with the opposed coated steel plate portion 4. It constitutes 30.

第一分割コア２１の特定被覆鋼板３０は、側方辺部２１１の外積層面２ｂの略全体に対向する対向被覆鋼板部４である第一外側対向部４００ａと、前方辺部２１２の外積層面２ｂの略全体に対向する対向被覆鋼板部４である第二外側対向部４００ｂとを備える。 The specific coated steel plate 30 of the first division core 21 has a first outer facing portion 400a which is a facing coated steel plate portion 4 facing substantially the entire outer laminated surface 2b of the side side portion 211 and an outer lamination of the front side portion 212. A second outer facing portion 400b, which is a facing coated steel plate portion 4 facing substantially the entire surface 2b, is provided.

第一外側対向部４００ａは、第一分割コア２１の特定被覆鋼板３０における側方辺部２１１を構成する部位から、Ｙ方向における外周コア２の外側に向かって延設されている。第二外側対向部４００ｂは、第一分割コア２１の特定被覆鋼板３０における前方辺部２１２を構成する部位から、前方Ｘ１に向かって延設されている。第一分割コア２１の特定被覆鋼板３０は、第一外側対向部４００ａ及び第二外側対向部４００ｂが第一分割コア２１の外積層面２ｂに対向する位置に配されるよう折り曲げられた形状を有する。 The first outer facing portion 400a extends from a portion constituting the side side portion 211 of the specific coated steel plate 30 of the first division core 21 toward the outside of the outer peripheral core 2 in the Y direction. The second outer facing portion 400b extends from the portion forming the front side portion 212 of the specific coated steel plate 30 of the first division core 21 toward the front X1. The specific coated steel sheet 30 of the first divided core 21 has a bent shape so that the first outer facing portion 400a and the second outer facing portion 400b are arranged at positions facing the outer laminated surface 2b of the first divided core 21. Have.

第二分割コア２２は、側方辺部２２１の外積層面２ｂの略全体に対向する対向被覆鋼板部４である第三外側対向部４００ｃと、後方辺部２２２の外積層面２ｂの略全体に対向する対向被覆鋼板部４である第四外側対向部４００ｄとを備える。 The second divided core 22 includes a third outer facing portion 400c, which is a facing coated steel plate portion 4 facing substantially the entire outer laminated surface 2b of the side side portion 221 and substantially the entire outer laminated surface 2b of the rear side portion 222. It is provided with a fourth outer facing portion 400d, which is a facing coated steel plate portion 4 facing the surface.

第三外側対向部４００ｃは、第二分割コア２２の特定被覆鋼板３０における側方辺部２２１を構成する部位から、Ｙ方向における外周コア２の外側に向かって延設されている。第四外側対向部４００ｄは、第二分割コア２２の特定被覆鋼板３０における後方辺部２２２を構成する部位から、後方Ｘ２に向かって延設されている。第二分割コア２２の特定被覆鋼板３０は、第三外側対向部４００ｃ及び第四外側対向部４００ｄが第二分割コア２２の外積層面２ｂに対向する位置に配されるよう折り曲げられた形状を有する。 The third outer facing portion 400c extends from the portion forming the side side portion 221 of the specific coated steel plate 30 of the second divided core 22 toward the outside of the outer peripheral core 2 in the Y direction. The fourth outer facing portion 400d extends toward the rear X2 from the portion constituting the rear side portion 222 of the specific coated steel plate 30 of the second divided core 22. The specific coated steel sheet 30 of the second split core 22 has a shape bent so that the third outer facing portion 400c and the fourth outer facing portion 400d are arranged at positions facing the outer laminated surface 2b of the second split core 22. Have.

本実施形態の点火コイル１は、外周コア２の前方辺部２１２、一対の側方辺部２１１、２２１、後方辺部２２２のそれぞれの外積層面２ｂの略全体に対向するよう、対向被覆鋼板部４（すなわち、第一外側対向部４００ａ、第二外側対向部４００ｂ、第三外側対向部４００ｃ、及び第四外側対向部４００ｄ）が形成されている。 The ignition coil 1 of the present embodiment is a facing coated steel plate so as to face substantially the entire outer laminated surface 2b of each of the front side portion 212, the pair of side side portions 211, 221 and the rear side portion 222 of the outer peripheral core 2. A portion 4 (that is, a first outer facing portion 400a, a second outer facing portion 400b, a third outer facing portion 400c, and a fourth outer facing portion 400d) is formed.

本実施形態においては、第一分割コア２１と第二分割コア２２とは、Ｚ方向の互いに同じ側の端部に、特定被覆鋼板３０が形成されているが、これに限られない。また、本実施形態においては、外周コア２の内周側には、対向被覆鋼板部４は配されていない。また、第一外側対向部４００ａ、第二外側対向部４００ｂ、第三外側対向部４００ｃ、及び第四外側対向部４００ｄは、これらが対向する外周コア２の外積層面２ｂの法線方向に、鋼板３１と絶縁被膜３２とが積層されており、いずれも外周コア２の外周側に、絶縁被膜３２が配されている。
その他は、実施形態４と同様である。 In the present embodiment, the first-divided core 21 and the second-divided core 22 have the specific coated steel plate 30 formed at the ends on the same side in the Z direction, but the present invention is not limited to this. Further, in the present embodiment, the facing coated steel plate portion 4 is not arranged on the inner peripheral side of the outer peripheral core 2. Further, the first outer facing portion 400a, the second outer facing portion 400b, the third outer facing portion 400c, and the fourth outer facing portion 400d are in the normal direction of the outer laminated surface 2b of the outer peripheral core 2 facing each other. The steel plate 31 and the insulating coating 32 are laminated, and the insulating coating 32 is arranged on the outer peripheral side of the outer peripheral core 2 in each case.
Others are the same as in the fourth embodiment.

本実施形態において、対向被覆鋼板部４は、少なくとも外周コア２の外積層面２ｂに対向している。それゆえ、封止樹脂１３の外周コア２の外側の領域に、クラックが生じることを防止することができる。これにより、例えば、外周コア２の外周側に生じたクラックがケース６まで進展し、ケース６ごと割れることを防止することができる。
その他、実施形態４と同様の作用効果を有する。 In the present embodiment, the opposed coated steel plate portion 4 faces at least the outer laminated surface 2b of the outer peripheral core 2. Therefore, it is possible to prevent cracks from occurring in the outer region of the outer peripheral core 2 of the sealing resin 13. As a result, for example, cracks generated on the outer peripheral side of the outer peripheral core 2 can be prevented from extending to the case 6 and cracking together with the case 6.
In addition, it has the same action and effect as in the fourth embodiment.

本発明は、前記各実施形態に限定されるものではなく、その要旨を逸脱しない範囲において種々の実施形態に適用することが可能である。 The present invention is not limited to each of the above embodiments, and can be applied to various embodiments without departing from the gist thereof.

例えば、中心コア５と外周コア２とを一体で形成することもできる。また、外周コア２は、環状に形成したが、これに限られず、例えばＵ字状等、一次コイル１１への通電及びその遮断により生じる磁束が通る閉磁路を構成すれば、他の形状に形成することも可能である。 For example, the central core 5 and the outer peripheral core 2 can be integrally formed. Further, the outer peripheral core 2 is formed in an annular shape, but is not limited to this, and can be formed in another shape if a closed magnetic path through which the magnetic flux generated by energization and interruption of the primary coil 11 is formed, such as a U shape. It is also possible to do.

また、例えば実施形態４又は実施形態５と、実施形態６を適宜組み合わせ、外周コアの内積層面及び外積層面の双方に対向する対向被覆鋼板部を形成することも可能である。 Further, for example, it is also possible to appropriately combine the fourth or fifth embodiment and the sixth embodiment to form a facing coated steel plate portion facing both the inner laminated surface and the outer laminated surface of the outer peripheral core.

１点火コイル
１１一次コイル
１２二次コイル
１３封止樹脂
２外周コア
２ａ内積層面
３被覆鋼板
３１鋼板
３２絶縁被膜
４対向被覆鋼板部 1 Ignition coil 11 Primary coil 12 Secondary coil 13 Encapsulating resin 2 Outer core 2a Inner laminated surface 3 Covered steel plate 31 Steel plate 32 Insulation coating 4 Opposed coated steel plate

Claims

The primary coil (11) and the secondary coil (12), which are magnetically coupled to each other,
A plurality of coated steel plates (3) provided with a steel plate (31) and an insulating coating (32) covering the surface of the steel plate are laminated in a stacking direction (Z) orthogonal to the coil axial direction (X), and the primary The outer peripheral core (2) arranged on the outer peripheral side of the coil and the secondary coil, and
A facing coated steel sheet formed of the coated steel sheet, facing at least one of an inner laminated surface (2a) formed on the inner circumference of the outer peripheral core and an outer laminated surface (2b) formed on the outer periphery of the outer peripheral core. Part (4) and
An ignition coil (1) comprising the primary coil, the secondary coil, the opposed coated steel plate portion, and a sealing resin (13) for sealing the outer peripheral core.

The ignition coil according to claim 1, further comprising the opposed coated steel plate portion facing the inner laminated surface of the outer peripheral core.

The facing coated steel plate portion is composed of a part of a specific coated steel plate (30) which is at least one of the coated steel plates constituting the outer peripheral core, and in the specific coated steel plate, the facing coated steel plate portion is the outer periphery. The ignition coil according to claim 1 or 2, which has a shape bent so as to be arranged at a position facing at least one of the inner laminated surface of the core and the outer laminated surface of the outer peripheral core.

The ignition coil according to claim 3, wherein the specific coated steel sheet is the coated steel sheet arranged at the end of the outer peripheral core in the stacking direction.

A central core (5) forming a closed magnetic path together with the outer peripheral core is arranged on the inner peripheral side of the primary coil so as to face the inner laminated surface of the outer peripheral core. A hole (413) is provided between the inner laminated surface of the outer peripheral core in the coil axial direction and the central core and penetrates in the coil axial direction at a portion facing the central core in the coil axial direction. The ignition coil according to any one of claims 1 to 4.

The claim that the facing coated steel plate portion is formed with a slit (414) formed from the hole portion on the outer peripheral side of the hole portion and dividing the facing coated steel plate portion in the circumferential direction of the hole portion. 5. The ignition coil according to 5.