JP6170282B2 - Ignition coil for internal combustion engines - Google Patents

Ignition coil for internal combustion engines Download PDF

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JP6170282B2
JP6170282B2 JP2012112526A JP2012112526A JP6170282B2 JP 6170282 B2 JP6170282 B2 JP 6170282B2 JP 2012112526 A JP2012112526 A JP 2012112526A JP 2012112526 A JP2012112526 A JP 2012112526A JP 6170282 B2 JP6170282 B2 JP 6170282B2
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iron core
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internal combustion
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JP2013239633A (en
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中村　拓
拓 中村
拓志 西村
拓志 西村
道憲 松田
道憲 松田
祐太 新古
祐太 新古
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Diamond Electric Manufacturing Co Ltd
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Description

本発明は、内燃機関用の点火コイルに関するものである。 The present invention relates to an ignition coil for an internal combustion engine.

従来より、ケース内に鉄芯と１次コイルと２次コイルを備え、熱硬化性を有したモールド樹脂により固定し絶縁される内燃機関用の点火コイルにおいて、動作時の高温と停止時放置時の低温の冷熱ストレスにより、外周鉄芯の熱膨張によりモールド樹脂に剥離やクラックが生じる場合がある。 Conventionally, an ignition coil for an internal combustion engine that has an iron core, a primary coil, and a secondary coil in a case, and is fixed and insulated by a thermosetting mold resin, when the operation is at a high temperature and when left at a stop Due to the low-temperature thermal stress, peeling or cracking may occur in the mold resin due to thermal expansion of the outer peripheral iron core.

このような問題を解決するために、外周鉄芯の周囲に配置されたカバーが絶縁樹脂と密着する素材のコアカバーと逆に絶縁樹脂と剥離する素材のコアカバーで構成しているものが提案されており、例えば、特許第３９００１４９号公報（以下「特許文献１」）が提案されている。 In order to solve such problems, it is proposed that the cover arranged around the outer peripheral iron core is composed of a core cover made of a material that peels away from the insulating resin, contrary to a core cover made of a material that adheres to the insulating resin. For example, Japanese Patent No. 3900169 (hereinafter referred to as “Patent Document 1”) has been proposed.

上記特許文献１とする点火コイルの上面断面図を図６に示す。図６において特許文献１では、１次コイル10と２次コイル20と、１次コイル10の内側に配置されたセンターコア30とで構成されたトランスと、２次コイル20の外側に配置されセンターコア30で発生した磁束を回帰させるサイドコア40と、サイドコア40の周囲に配置されたカバー200a，200bと、これら部品類を収納するケース70と、ケース70内で部品類を固定するための絶縁樹脂90とを備えた点火コイルにおいて、カバー200a，200bは、絶縁樹脂90と密着する素材の第１のコアカバー200aと、絶縁樹脂90と剥離する素材の第２のコアカバー200bの２種類のカバーで構成され、サイドコア40とトランスとの間において、絶縁樹脂90、第１のコアカバー200a、第２のコアカバー200bの少なくとも３層構造をなし、サイドコア40側に第２のコアカバー200bを配置し、トランス側に第１のコアカバー200aを配置している。 FIG. 6 shows a top sectional view of the ignition coil described in Patent Document 1. In FIG. 6, in Patent Document 1, a transformer composed of a primary coil 10, a secondary coil 20, and a center core 30 disposed inside the primary coil 10, and a center disposed outside the secondary coil 20. Side core 40 for returning magnetic flux generated in the core 30, covers 200a and 200b arranged around the side core 40, a case 70 for storing these components, and an insulating resin for fixing the components in the case 70 The cover 200a, 200b includes two types of covers, a first core cover 200a made of a material that is in close contact with the insulating resin 90 and a second core cover 200b made of a material that is peeled off from the insulating resin 90. It is composed of at least three layers of insulating resin 90, first core cover 200a, and second core cover 200b between the side core 40 and the transformer, and the second core cover 200b is disposed on the side core 40 side. And transformer And the first core cover 200a disposed.

特許第３９００１４９号公報Japanese Patent No. 3900139

しかしながら上記従来の点火コイルでは次のような問題が生じている。即ち、特許文献１の点火コイルでは、カバーが絶縁樹脂と密着する素材のコアカバーと逆に絶縁樹脂と剥離する素材のコアカバーで構成されているので、絶縁樹脂と剥離しやすい部分による緩衝作用となり、必要な部分での絶縁樹脂の剥離やクラックを防止でき、部品への歪を緩和しているが、絶縁樹脂と剥離する素材のコアカバーと外周鉄芯（サイドコア）の間の絶縁樹脂が外周鉄芯（サイドコア）のエッジによって発生したクラックがケース開口表面まで波及する問題が生じる。また、ケース開口表面まで達したクラックから点火コイル内に水滴などが侵入する問題も生じる。 However, the conventional ignition coil has the following problems. That is, in the ignition coil of Patent Document 1, since the cover is composed of a core cover made of a material that peels away from the insulating resin, contrary to a core cover made of a material that is in close contact with the insulating resin, a buffering action by a portion that easily peels off from the insulating resin. Therefore, it is possible to prevent the insulation resin from peeling and cracking at the necessary parts, and to reduce distortion to the parts. However, the insulation resin between the core cover of the material to be separated from the insulation resin and the outer core (side core) There arises a problem that cracks generated by the edge of the outer peripheral iron core (side core) spread to the case opening surface. Further, there also arises a problem that water droplets or the like enter the ignition coil from the crack that reaches the surface of the case opening.

本発明は上記課題に鑑みなされたもので、外周鉄芯のエッジから発生するクラックを防ぐとともに、エンジンルーム内の限られたスペースに収めることができる小型の点火コイルを提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a small ignition coil that can prevent cracks generated from the edge of an outer peripheral iron core and can be accommodated in a limited space in an engine room. .

上記課題を解決するために本発明は次のような構成とする。即ち、中心鉄芯及び外周鉄芯からなる鉄芯と、１次コイルと、２次コイルと、当該鉄芯及び１次コイル及び２次コイルの収容部及び当該収容部に対し空間的連通状態を形成する開口部を有するケースと、当該ケース内に充填されるモールド樹脂と、前記鉄芯に積層される第１のカバー及び第２のカバーと、を備え、
前記第１のカバーは、前記第２のカバーよりも、前記鉄芯と前記モールド樹脂との間の固定関係を剥離させ易い材質であって、且つ、前記第１のカバーから前記鉄芯を露出させている閉じた露出領域が形成されており、
前記露出領域は、前記第１のカバーのうち、二次コイル対向面に対して前記開口部よりに形成されており、
前記鉄芯の周りの積層構造は、前記鉄芯へ前記第２のカバーを伴わずに前記第１のカバーが積層された第１の積層構造と、前記鉄芯に与えられた前記露出領域へ前記第１のカバーを伴わずに前記第２のカバーが積層された第２の積層構造と、前記鉄芯，前記第１のカバー，前記第２のカバーの順にて形成された第３の積層構造と、を備え、
前記第１の積層構造は、前記モールド樹脂の樹脂面及び前記第２のカバーに遮られて、外部環境へ臨む露出箇所が存在していないこととする。
In order to solve the above problems, the present invention is configured as follows. That is, an iron core composed of a central iron core and an outer peripheral iron core, a primary coil, a secondary coil, a housing portion of the iron core, the primary coil, and the secondary coil, and a spatial communication state with respect to the housing portion. A case having an opening to be formed, a mold resin filled in the case, and a first cover and a second cover laminated on the iron core ,
The first cover is made of a material that is easier to peel the fixing relationship between the iron core and the mold resin than the second cover, and the iron core is exposed from the first cover. A closed exposed area is formed,
The exposed region is formed from the opening with respect to the secondary coil facing surface of the first cover,
The laminated structure around the iron core includes a first laminated structure in which the first cover is laminated on the iron core without the second cover, and the exposed region given to the iron core. A second laminated structure in which the second cover is laminated without the first cover, and a third laminated structure formed in the order of the iron core, the first cover, and the second cover. A structure,
The first laminated structure is shielded by the resin surface of the mold resin and the second cover, and there is no exposed portion facing the external environment .

特に、前記第３の積層構造は、前記モールド樹脂の表面部に配置されてもよい。また、記第１のカバーは、前記第２のカバーの有する弾性よりも高い弾性を有した部材から成形され、前記第２のカバーは、前記第１のカバーに嵌合して固定されてもよい。 In particular, the third laminated structure may be disposed on the surface portion of the mold resin . The first cover may be formed from a member having elasticity higher than that of the second cover, and the second cover may be fitted and fixed to the first cover. Good.

また、前記第１のカバーは、前記外周鉄芯の角部に配置されていてもよい。さらに、前記第２のカバーは、ポリブチレンテレフタレート、又はポリエチレンテレフタレートから成形され、前記第１のカバーは、エラストマ、又はシリコンから成形されてもよい。
The first cover may be disposed at a corner of the outer peripheral iron core. Further, the second cover, polybutylene terephthalate, or molded from polyethylene terephthalate, the first cover, the elastomer, or may be molded from silicon.

上記の通り、外周鉄芯は、鉄芯の磁路がケースの開口面と垂直方向の向きに配置されるとともに、２次コイルと対向する面及び側面の少なくとも一部の外周に前記モールド樹脂と剥離する第１のカバーを備え、第１のカバーは、少なくとも周囲の一部が前記モールド樹脂と接着する第２のカバーに覆われ、第２のカバーは、第２のカバー突出部がモールド樹脂の樹脂面から突出することで、外周鉄芯から発生するクラックを防ぐとともに、エンジンルーム内の限られたスペースに収めることができる小型の点火コイルが実現できる。 As described above, the outer peripheral iron core is arranged such that the magnetic path of the iron core is arranged in a direction perpendicular to the opening surface of the case, and the mold resin is disposed on the outer periphery of at least a part of the surface and side surface facing the secondary coil The first cover is peeled off, and the first cover is covered with a second cover at least a part of the periphery of which is bonded to the mold resin, and the second cover has a second cover protruding portion as the mold resin. By projecting from the resin surface, it is possible to realize a small ignition coil which can prevent cracks generated from the outer peripheral iron core and can be stored in a limited space in the engine room.

また、第１のカバーは、ケース開口面と平行する外周鉄芯の露出部を露出する第１のカバー開口部が形成され、外周鉄芯露出部は、第２のカバーのみに覆われる構成とすることで、鉄芯の高さ寸法が第２のカバーの厚さのみに抑えられるため、点火コイルの高さ寸法を抑え、小型化することができる。 The first cover is formed with a first cover opening that exposes the exposed portion of the outer peripheral iron core parallel to the case opening surface, and the outer peripheral iron core exposed portion is covered only by the second cover. By doing so, since the height dimension of the iron core is suppressed only to the thickness of the second cover, the height dimension of the ignition coil can be suppressed and the size can be reduced.

本発明の第１の実施例とする内燃機関用の点火コイルの斜視図である。1 is a perspective view of an ignition coil for an internal combustion engine according to a first embodiment of the present invention. 図１の矢印（A）方向から見たB-B断面図であるIt is BB sectional drawing seen from the arrow (A) direction of FIG. 第１の実施例とする外周鉄芯の組み立てを表す斜視図である。It is a perspective view showing the assembly of the outer periphery iron core which is a 1st Example. 第１の実施例とする鉄芯アセンブリの斜視図である。It is a perspective view of the iron core assembly which becomes a 1st Example. 第１の実施例とする鉄芯アセンブリの側面断面図である。It is side surface sectional drawing of the iron core assembly made into a 1st Example. 特許文献１とする点火コイルの上面断面図である。It is an upper surface sectional view of an ignition coil made into patent documents 1.

以下に本発明の実施の形態を示す実施例を図１乃至図５に基づいて説明する。 Hereinafter, examples showing embodiments of the present invention will be described with reference to FIGS.

本発明の第１の実施例とする内燃機関用の点火コイルの斜視図を図１に、図１の矢印（A）方向から見たB-B断面図を図２に、鉄芯アセンブリの組み立てを表す斜視図を図３に、鉄芯アセンブリの斜視図を図４に、鉄芯アセンブリの側面断面図を図５にそれぞれ示す。 FIG. 1 is a perspective view of an ignition coil for an internal combustion engine according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line BB of FIG. FIG. 3 is a perspective view, FIG. 4 is a perspective view of the iron core assembly, and FIG. 5 is a side sectional view of the iron core assembly.

図１及び図２において、点火コイル100の外形を形成するケース70は、絶縁性を有した樹脂からなる鉛直方向上面に開口面70aを形成した箱型に成形されている。また、当該ケース70には当該点火コイル100をエンジンブロックに取り付け固定するための略三角柱状のフランジ72を形成している。 1 and 2, the case 70 forming the outer shape of the ignition coil 100 is formed in a box shape having an opening surface 70a formed on the upper surface in the vertical direction made of an insulating resin. Further, the case 70 is formed with a substantially triangular prism-like flange 72 for attaching and fixing the ignition coil 100 to the engine block.

また、前記点火コイル100は、珪素鋼板を３０枚程度積層して形成したＩ字型の中心鉄芯30とコの字型の外周鉄芯40を組み合わせて閉磁路構造とする鉄芯と、当該中心鉄芯30の外周に樹脂で成形した１次ボビンの外周に１次巻線を１００ターン程度巻き回した１次コイル10と、当該１次コイル10の外周に樹脂で成形した２次ボビンの外周に２次巻線を８０００〜１５０００ターン程度巻き回した２次コイル20のコイル部から構成されている。さらに、前記中心鉄芯30及び前記外周鉄芯40は、前記ケース開口面70aに対して平行方向に当該珪素鋼板を積層している。 The ignition coil 100 includes an iron core having a closed magnetic circuit structure by combining an I-shaped central iron core 30 formed by laminating about 30 silicon steel plates and a U-shaped outer iron core 40; A primary coil 10 in which a primary winding is wound about 100 turns on the outer periphery of a primary bobbin formed of resin on the outer periphery of the central iron core 30, and a secondary bobbin formed of resin on the outer periphery of the primary coil 10 It comprises a coil portion of a secondary coil 20 in which a secondary winding is wound about 8000 to 15000 turns on the outer periphery. Further, the central iron core 30 and the outer peripheral iron core 40 are laminated with the silicon steel plates in a direction parallel to the case opening surface 70a.

また、前記外周鉄芯40は前記鉄芯の磁路が前記ケース開口面70aと垂直方向になるように配置されている。さらに、前記中心鉄芯30と前記外周鉄芯40の接続面の一方には前記１次コイル10に発生した磁束と反対方向の磁束を磁路中に発生させるためのマグネット32を備えている。 The outer peripheral iron core 40 is arranged so that the magnetic path of the iron core is perpendicular to the case opening surface 70a. Further, a magnet 32 for generating a magnetic flux in a direction opposite to the magnetic flux generated in the primary coil 10 in one of the connecting surfaces of the central iron core 30 and the outer peripheral iron core 40 is provided.

また、前記ケース70の外側底面には、エンジン上部に形成されたプラグホール内に向かって突出する高圧タワー74が形成され、当該高圧タワー74は前記２次コイル20から出力される２次電圧を点火プラグに供給するための高圧端子76を備えている。 Further, a high voltage tower 74 is formed on the outer bottom surface of the case 70 so as to project into a plug hole formed in the upper part of the engine. The high voltage tower 74 receives a secondary voltage output from the secondary coil 20. A high voltage terminal 76 is provided for supplying the spark plug.

また、前記２次コイル20の一端には前記高圧端子76に２次電圧を供給するための２次高圧端子22が備えられている。さらに、前記２次コイル20の他端には前記１次コイル10からの１次電圧を受け取るための２次低圧端子（図示しない）が備えられている。 A secondary high voltage terminal 22 for supplying a secondary voltage to the high voltage terminal 76 is provided at one end of the secondary coil 20. Further, a secondary low voltage terminal (not shown) for receiving a primary voltage from the primary coil 10 is provided at the other end of the secondary coil 20.

また、前記ケース70内には前記１次コイル10への点火信号を供給するスイッチング素子及びリードフレームを絶縁樹脂モールドしたものからなるイグナイタ82が備えられている。さらに、当該リードフレームは当該スイッチング素子のベース、コレクタ、及び、エミッタのそれぞれが外部と接続するためのイグナイタ端子84としての機能を有している。 The case 70 is provided with a switching element for supplying an ignition signal to the primary coil 10 and an igniter 82 made of an insulating resin molded lead frame. Further, the lead frame has a function as an igniter terminal 84 for connecting each of the base, collector, and emitter of the switching element to the outside.

また、前記ケース70の側面にはコネクタ78が形成され、当該コネクタ78にはバッテリ、ECU、前記鉄芯、及び、前記イグナイタ82と電気的に接続するためのコネクタ端子80がインサート成形されている。さらに、当該コネクタ端子80は当該バッテリから前記１次コイル10及び前記２次コイル20の低圧側を結ぶ端子と、当該ECUから前記イグナイタ82のベース側に配置された前記イグナイタ端子84を結ぶ端子と、前記イグナイタ82のエミッタ側に配置された前記イグナイタ端子84及び前記鉄芯からグランドを結ぶ端子と、の合計３本の端子から構成されている。 Further, a connector 78 is formed on the side surface of the case 70, and the connector 78 is insert-molded with a connector terminal 80 for electrical connection with the battery, ECU, the iron core, and the igniter 82. . Further, the connector terminal 80 includes a terminal connecting the low voltage side of the primary coil 10 and the secondary coil 20 from the battery, and a terminal connecting the igniter terminal 84 disposed on the base side of the igniter 82 from the ECU. The igniter 82 is arranged on the emitter side of the igniter terminal 84 and the terminal connecting the iron core to the ground.

また、前記コネクタ端子80及び前記イグナイタ端子84は略平板状の金属端子からなり、前記コネクタ端子80及び前記イグナイタ端子84は前記ケース開口面70aと垂直方向に導出され、前記コネクタ端子80は前記ケース70に形成された前記コネクタ78と同一面の前記ケース70の内壁に沿って配置されている。さらに、前記コネクタ端子80及び前記イグナイタ端子84のうち２個を同方向に導出させるとともに、それぞれの間で電気的に導通を実現する如く溶接を用いて接続されている。 The connector terminal 80 and the igniter terminal 84 are substantially flat metal terminals, the connector terminal 80 and the igniter terminal 84 are led out in a direction perpendicular to the case opening surface 70a, and the connector terminal 80 is connected to the case. It is disposed along the inner wall of the case 70 on the same plane as the connector 78 formed on the 70. Further, two of the connector terminal 80 and the igniter terminal 84 are led out in the same direction, and are connected by welding so as to realize electrical conduction between the two.

また、前記ケース70内には前記点火コイル100の電気的絶縁及び各部材の物理的固定を実現する前記モールド樹脂90が充填されている。さらに、前記モールド樹脂90は前記ケース開口面70a付近まで充填され、前記中心鉄芯30、前記１次コイル10、前記２次コイル20、及び、前記イグナイタ82は前記ケース開口面70a付近に形成される樹脂面92より低い位置に備えられ、前記外周鉄芯40のコイル平行部42の一部は当該樹脂面92から高い位置に露出している。 The case 70 is filled with the mold resin 90 that realizes electrical insulation of the ignition coil 100 and physical fixation of each member. Further, the mold resin 90 is filled up to the vicinity of the case opening surface 70a, and the central iron core 30, the primary coil 10, the secondary coil 20, and the igniter 82 are formed in the vicinity of the case opening surface 70a. A part of the coil parallel part 42 of the outer peripheral iron core 40 is exposed at a position higher than the resin surface 92.

また、前記外周鉄芯40の周囲は前記モールド樹脂90と剥離する材質のエラストマで成形された第１のカバー60を備えている。さらに、当該第１のカバー60は前記外周鉄芯40におけるケース開口面70aに対して垂直となる面44及び前記２次コイル20と対向する面46に２次コイル対向部62を備えている。 In addition, the periphery of the outer peripheral iron core 40 is provided with a first cover 60 formed of an elastomer made of a material that peels off from the mold resin 90. Further, the first cover 60 includes a secondary coil facing portion 62 on a surface 44 that is perpendicular to the case opening surface 70 a of the outer peripheral iron core 40 and a surface 46 that faces the secondary coil 20.

また、前記第１のカバー60の周囲は前記モールド樹脂90と接着する材質のPBT（ポリブチレンテレフタレート）で成形された第２のカバー50を備えている。さらに、当該第２のカバー50は前記樹脂面92より高い位置に第２のカバー突出部50aを備えている。 Further, the periphery of the first cover 60 is provided with a second cover 50 formed of PBT (polybutylene terephthalate) made of a material that adheres to the mold resin 90. Further, the second cover 50 includes a second cover protrusion 50 a at a position higher than the resin surface 92.

図３乃至図５において、前記第１のカバー60は前記２次コイル対向部62と反対側の面に第１のカバー開口部66を形成し、前記外周鉄芯40の露出部42aは当該第１のカバー開口部66により前記第２のカバー50に直接覆われている。また、前記第１のカバー60は前記外周鉄芯40の前記中心鉄芯30及び前記マグネット32との接続面、並びに当該第１のカバー開口部66を除いた周囲を覆っている。さらに、前記第２のカバー50は第１のカバー側面部64及び当該第１のカバー開口部66を覆うように配置され、前記第１のカバー60に嵌合して固定されている。 3 to 5, the first cover 60 has a first cover opening 66 formed on the surface opposite to the secondary coil facing portion 62, and the exposed portion 42a of the outer peripheral iron core 40 has the first cover 60a. The first cover opening 66 directly covers the second cover 50. The first cover 60 covers the periphery of the outer peripheral iron core 40 except for the connection surface between the central iron core 30 and the magnet 32 and the first cover opening 66. Further, the second cover 50 is disposed so as to cover the first cover side face portion 64 and the first cover opening 66, and is fitted and fixed to the first cover 60.

また、前記第２のカバー50の側面部54には前記ケース70に前記コイル部を収用した際に、前記ケース70内壁と圧接して固定するための第２のカバー突部52が形成されている。さらに、前記第２のカバー側面部54は前記樹脂面92より低い位置になるように形成される。 Further, a second cover protrusion 52 is formed on the side surface portion 54 of the second cover 50 so as to be fixed in pressure contact with the inner wall of the case 70 when the coil portion is stowed in the case 70. Yes. Further, the second cover side surface portion 54 is formed at a position lower than the resin surface 92.

上記構成により、前記外周鉄芯40の周囲は前記第１のカバー60を備え、前記第１のカバー60は前記外周鉄芯40の前記中心鉄芯30及び前記マグネット32との接続面、並びに前記第１のカバー開口部66を除いた周囲を覆っている。これにより、前記外周鉄芯４０が前記モールド樹脂90から剥離しているため、点火コイル動作時の高温による膨張や停止時放置時の低温による収縮することによるクラック発生を防ぐことができる。また、前記外周鉄芯40は前記ケース開口面70aに対して垂直方向に前記珪素鋼板を積層しているため前記ケース開口面70a方向へのクラックが発生し易いが、上記構成より前記珪素鋼板の積層面が前記モールド樹脂90と剥離することで前記樹脂面92に対するクラックの発生を防ぐことができる。 With the above configuration, the periphery of the outer peripheral iron core 40 includes the first cover 60, and the first cover 60 has a connection surface between the outer peripheral iron core 40 and the central iron core 30 and the magnet 32, and the The periphery except for the first cover opening 66 is covered. Thereby, since the said outer periphery iron core 40 has peeled from the said mold resin 90, it can prevent the crack generation by the expansion | swelling by the high temperature at the time of ignition coil operation | movement, and the shrinkage | contraction by the low temperature at the time of standing at the time of a stop. Further, since the silicon steel sheet is laminated in a direction perpendicular to the case opening surface 70a in the outer peripheral iron core 40, cracks in the direction of the case opening surface 70a are likely to occur. Generation of cracks in the resin surface 92 can be prevented by separating the laminated surface from the mold resin 90.

また、前記第１のカバー開口部66は前記鉄芯の高さ寸法Ｈに前記第１のカバー60の厚さが含まれない位置となるように形成し、前記外周鉄芯40の前記露出部42aは前記第１のカバー開口部66により前記第２のカバー50に直接覆われることで、前記鉄芯の高さ寸法Ｈ（図５記載）が前記第２のカバー50の厚さＣｈ（図５記載）のみに抑えられるため、前記点火コイル100の高さ寸法を抑え、小型化することができる。 The first cover opening 66 is formed such that the height H of the iron core does not include the thickness of the first cover 60, and the exposed portion of the outer iron core 40 is formed. 42a is directly covered by the second cover 50 by the first cover opening 66, so that the height dimension H (shown in FIG. 5) of the iron core is the thickness Ch (see FIG. 5) of the second cover 50. 5), the height of the ignition coil 100 can be suppressed and the size can be reduced.

また、前記外周鉄芯40は前記鉄芯の磁路が前記ケース開口面70aと垂直方向になるように配置され、前記外周鉄芯40の前記コイル平行部42の一部は当該樹脂面92から高い位置に露出しているとともに、前記第１のカバー60の周囲は前記第２のカバー50を備え、前記外周鉄芯40の前記露出部42aは前記第１のカバー開口部66により前記第２のカバー50に直接覆われている。これにより、前記外周鉄芯40の前記露出部42aを外部環境から保護することができる。 Further, the outer peripheral iron core 40 is disposed so that the magnetic path of the iron core is perpendicular to the case opening surface 70a, and a part of the coil parallel part 42 of the outer peripheral iron core 40 is formed from the resin surface 92. In addition to being exposed at a high position, the periphery of the first cover 60 is provided with the second cover 50, and the exposed portion 42 a of the outer peripheral iron core 40 is formed by the first cover opening 66 to the second. Directly covered by the cover 50. Thereby, the exposed portion 42a of the outer peripheral iron core 40 can be protected from the external environment.

上記実施例１の変形例として、前記中心鉄芯30及び前記外周鉄芯４０の形状並びに積層する珪素鋼板の枚数は設計事情によって適宜変更してもよいし、前記１次コイル10及び前記２次コイル20に巻き回す巻線の巻数は前記点火コイル100に要求される出力等、設計事情によって任意に変更してもよい。また、前記第１のカバー６０は弾性及び前記モールド樹脂90と剥離する性質を有していればシリコンなどエラストマ以外の材質を用いて成形してもよい。さらに、前記第２のカバー５０は前記モールド樹脂90と接着する性質を有していればＰＥＴ（（ポリエチレンテレフタレート）などＰＢＴ以外の材質を用いて成形してもよい。 As a modification of the first embodiment, the shapes of the central iron core 30 and the outer peripheral iron core 40 and the number of laminated silicon steel plates may be appropriately changed according to design circumstances, or the primary coil 10 and the secondary coil. The number of windings wound around the coil 20 may be arbitrarily changed according to design circumstances such as an output required for the ignition coil 100. Further, the first cover 60 may be molded using a material other than an elastomer such as silicon as long as it has elasticity and a property of peeling off from the mold resin 90. Further, the second cover 50 may be molded using a material other than PBT such as PET ((polyethylene terephthalate)) as long as it has a property of adhering to the mold resin 90.

また、前記第１のカバー60は前記外周鉄芯40の前記２次コイル対向面46及び前記外周鉄芯側面44の少なくとも一部を覆う位置に配置してもよいし、前記第１のカバー60は前記外周鉄芯40の角部のみを覆う位置に配置してもよい。さらに、前記第２のカバー50は少なくとも前記外周鉄芯40の前記露出部42aに配置すれば、その他の構成は設計事情によって任意に変更してもよい。 The first cover 60 may be disposed at a position covering at least a part of the secondary coil facing surface 46 and the outer peripheral iron core side surface 44 of the outer peripheral iron core 40, or the first cover 60. May be arranged at a position covering only the corner of the outer peripheral iron core 40. Furthermore, as long as the second cover 50 is disposed at least on the exposed portion 42a of the outer peripheral iron core 40, other configurations may be arbitrarily changed depending on design circumstances.

また、前記点火コイル100は、少なくとも前記第２のカバー50の前記第２のカバー突出部50aが前記樹脂面92から突出すれば、その他の構成は設計事情によって任意の形状に変更してもよい。さらに、前記第２のカバー50と前記第１のカバー60の固定方法は嵌合以外でも、例えば接着剤等を用いて固定してもよい。 Further, the ignition coil 100 may be changed to any shape according to design circumstances as long as at least the second cover protrusion 50a of the second cover 50 protrudes from the resin surface 92. . Further, the second cover 50 and the first cover 60 may be fixed using, for example, an adhesive or the like other than fitting.

また、前記第１のカバー開口部66は前記第１のカバー60の厚さによって前記鉄芯の高さ寸法が増加すること防ぐ位置であれば、設計事情によって任意の形状に変更してもよい。 Further, the first cover opening 66 may be changed to an arbitrary shape depending on design circumstances as long as the height of the iron core is prevented from increasing due to the thickness of the first cover 60. .

10：１次コイル
20：２次コイル
22：２次高圧端子
30：中心鉄芯
32：マグネット
40：外周鉄芯
42：コイル平行部
42a：外周鉄芯露出部
44：外周鉄芯側面
46：２次コイル対向面
50：第２のカバー
50a：第２のカバー突出部
52：第２のカバー突部
54：第２のカバー側面部
60：第１のカバー
62：２次コイル対向部
64：第１のカバー側面部
66：第１のカバー開口部
70：ケース
70a：ケース開口面
72：フランジ
74：高圧タワー
76：高圧端子
78：コネクタ
80：コネクタ端子
82：イグナイタ
84：イグナイタ端子
90：モールド樹脂
92：樹脂面
100：点火コイル 10: 1 primary coil
20: Secondary coil
22: Secondary high-voltage terminal
30: Central iron core
32: Magnet
40: Outer iron core
42: Coil parallel part
42a: Outer peripheral iron core exposed part
44: Outer iron core side
46: Secondary coil facing surface
50: Second cover
50a: second cover protrusion
52: Second cover protrusion
54: Second cover side surface
60: First cover
62: Secondary coil facing part
64: First cover side surface
66: First cover opening
70: Case
70a: Case opening surface
72: Flange
74: High pressure tower
76: High voltage terminal
78: Connector
80: Connector terminal
82: Igniter
84: Igniter terminal
90: Mold resin
92: Resin surface
100: Ignition coil

Claims (5)

中心鉄芯及び外周鉄芯からなる鉄芯と、１次コイルと、２次コイルと、当該鉄芯及び１次コイル及び２次コイルの収容部及び当該収容部に対し空間的連通状態を形成する開口部を有するケースと、当該ケース内に充填されるモールド樹脂と、前記鉄芯に積層される第１のカバー及び第２のカバーと、を備え、
前記第１のカバーは、前記第２のカバーよりも、前記鉄芯と前記モールド樹脂との間の固定関係を剥離させ易い材質であって、且つ、前記第１のカバーから前記鉄芯を露出させている閉じた露出領域が形成されており、
前記露出領域は、前記第１のカバーのうち、二次コイル対向面に対して前記開口部よりに形成されており、
前記鉄芯の周りの積層構造は、前記鉄芯へ前記第２のカバーを伴わずに前記第１のカバーが積層された第１の積層構造と、前記鉄芯に与えられた前記露出領域へ前記第１のカバーを伴わずに前記第２のカバーが積層された第２の積層構造と、前記鉄芯，前記第１のカバー，前記第２のカバーの順にて形成された第３の積層構造と、を備え、
前記第１の積層構造は、前記モールド樹脂の樹脂面及び前記第２のカバーに遮られて、外部環境へ臨む露出箇所が存在していないことを特徴とする内燃機関用の点火コイル。 A spatial communication state is formed with respect to the iron core composed of the central iron core and the outer peripheral iron core, the primary coil, the secondary coil, the iron core, the primary coil, the housing portion of the secondary coil, and the housing portion. A case having an opening; a mold resin filled in the case; and a first cover and a second cover laminated on the iron core ,
The first cover is made of a material that is easier to peel the fixing relationship between the iron core and the mold resin than the second cover, and the iron core is exposed from the first cover. A closed exposed area is formed,
The exposed region is formed from the opening with respect to the secondary coil facing surface of the first cover,
The laminated structure around the iron core includes a first laminated structure in which the first cover is laminated on the iron core without the second cover, and the exposed region given to the iron core. A second laminated structure in which the second cover is laminated without the first cover, and a third laminated structure formed in the order of the iron core, the first cover, and the second cover. A structure,
The ignition coil for an internal combustion engine, wherein the first laminated structure is shielded by the resin surface of the mold resin and the second cover, and there is no exposed portion facing the external environment . 前記第３の積層構造は、前記モールド樹脂の表面部に配置されていることを特徴とする請求項１に記載の内燃機関用の点火コイル。 The ignition coil for an internal combustion engine according to claim 1, wherein the third laminated structure is disposed on a surface portion of the mold resin . 前記第１のカバーは、前記第２のカバーの有する弾性よりも高い弾性を有した部材から成形され、
前記第２のカバーは、前記第１のカバーに嵌合して固定されることを特徴とする請求項１又は請求項２に記載の内燃機関用の点火コイル。 The first cover is formed from a member having elasticity higher than that of the second cover,
3. The ignition coil for an internal combustion engine according to claim 1, wherein the second cover is fitted and fixed to the first cover. 前記第１のカバーは、前記外周鉄芯の角部に配置されることを特徴とする請求項１乃至請求項３の何れか一項に記載の内燃機関用の点火コイル。   The ignition coil for an internal combustion engine according to any one of claims 1 to 3, wherein the first cover is disposed at a corner portion of the outer peripheral iron core. 前記第２のカバーは、ポリブチレンテレフタレート、又はポリエチレンテレフタレートから成形され、
前記第１のカバーは、エラストマ、又はシリコンから成形されていることを特徴とする請求項１乃至請求項４の何れか一項に記載の内燃機関用の点火コイル。 The second cover is molded from polybutylene terephthalate or polyethylene terephthalate,
The ignition coil for an internal combustion engine according to any one of claims 1 to 4 , wherein the first cover is formed from an elastomer or silicon.
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