JP2003017342A - Ignition coil for internal combustion engine - Google Patents
Ignition coil for internal combustion engineInfo
- Publication number
- JP2003017342A JP2003017342A JP2001198934A JP2001198934A JP2003017342A JP 2003017342 A JP2003017342 A JP 2003017342A JP 2001198934 A JP2001198934 A JP 2001198934A JP 2001198934 A JP2001198934 A JP 2001198934A JP 2003017342 A JP2003017342 A JP 2003017342A
- Authority
- JP
- Japan
- Prior art keywords
- iron core
- case
- coil
- primary
- central iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、内燃機関用点火
コイルのコイル構造に関し、特に中心鉄芯からの高電圧
の絶縁性にすぐれた点火コイルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil structure of an ignition coil for an internal combustion engine, and more particularly to an ignition coil having a high voltage insulation from a central iron core.
【０００２】[0002]
【従来の技術】近時内燃機関用点火コイルは、内燃機関
の小型化に伴って小型で高特性のものが要求されてい
る。従来よりダブルオーバーヘッドカム型内燃機関で
は、シリンダヘッド間に作られる空間にディストリビュ
ータを必要としないプラグ直付けタイプの点火コイルが
実用化されている。しかしながらこのような点火コイル
においても更に出力特性の向上やイグナイタ内蔵化など
の付加価値が要求されるが、実際には点火コイル本体の
小型化は至難であり、従ってこのような高付加価値の点
火コイルを内燃機関、特にシリンダヘッドの限られたス
ペースに配置することは困難になってきている。2. Description of the Related Art Recently, an ignition coil for an internal combustion engine is required to have a small size and high characteristics as the internal combustion engine becomes smaller. 2. Description of the Related Art Conventionally, in a double overhead cam type internal combustion engine, an ignition coil of a plug direct mounting type that does not require a distributor in a space formed between cylinder heads has been put into practical use. However, even in such an ignition coil, additional value such as improvement of output characteristics and incorporation of an igniter is required, but it is actually difficult to downsize the ignition coil main body, and thus such high value-added ignition is required. It is becoming difficult to place the coil in the limited space of the internal combustion engine, especially the cylinder head.
【０００３】このような状況の中で、点火プラグが取り
付けられるプラグホールに形成される空間に点火コイル
の一部もしくは全部を配置するタイプのものがいくつか
提案されている。このような点火コイルは、エンジンヘ
ッドのプラグホール内にその一部もしくは全部を配置し
収納するため、エンジンヘッド上のスペースが縮小でき
ることと、高電圧を点火プラグに直接供給するためハイ
テンションケーブルのような点火プラグに伝導する線が
必要ないため電装品に悪影響がある点火時のノイズの発
生が小さいことと、点火エネルギーの点火プラグへの伝
搬損失も少ないことなどの利点から多くのエンジンに使
用されている。一般に自動車用内燃機関の点火プラグの
最大外径寸法は１６ミリメートルから２０ミリメートル
程度であり、これが挿入されるプラグホールは、内径が
２０ミリメートルから３５ミリメートル程度で、奥行き
は１００ミリメートル前後である。Under such circumstances, some types have been proposed in which a part or all of the ignition coil is arranged in a space formed in a plug hole in which an ignition plug is attached. Such an ignition coil is partly or wholly housed inside the plug hole of the engine head, and therefore, the space on the engine head can be reduced, and since a high voltage is directly supplied to the ignition plug, the high tension cable It is used for many engines because it does not require a wire to conduct to the spark plug, which adversely affects electrical components, produces less noise during ignition, and has less propagation loss of ignition energy to the spark plug. Has been done. Generally, a spark plug of an internal combustion engine for an automobile has a maximum outer diameter of about 16 mm to 20 mm, and a plug hole into which the spark plug is inserted has an inner diameter of about 20 mm to 35 mm and a depth of about 100 mm.
【０００４】図４に従来技術を適用した点火プラグに高
電圧を直接供給する内燃機関用点火コイルの図を示す。
図４において、点火プラグに高電圧を直接供給する点火
コイルは、ケース１１の上部収納部１１ｂに１次電流入
力部１２と、場合によっては１次電流をオン−オフする
イグナイタ１３を収納している。中心鉄芯１８と同軸的
に、２次ボビン１６に２次銅線を巻回した２次コイル１
７と、１次ボビン１４に１次銅線を巻回した１次コイル
１５と、円筒形状に形作られその円周の一部に切り欠き
部を有する外装鉄芯１９とを順に配置し、当該中心鉄芯
１８は両端に、鉄芯の磁束の飽和を抑制するために１次
コイル１５で発生する磁束ｍと反対方向の磁束を発生さ
せる磁石２１−２１を装着し、ケース１１底部には２次
高圧端子２２を備え、当該２次高圧端子２２は、２次コ
イル１７とケース１１に備えた高圧タワー部１１ａ内の
スプリング２３と電気的に接続され、ケース１１上部の
開口部からエポキシ樹脂５１を注入充填して硬化させ、
絶縁封止している。さらに前記高圧タワー部１１ａに
は、図示しないプラグホール等の金属部に高電圧がリー
クしないようにプロテクタ２５を備える。FIG. 4 shows a diagram of an internal combustion engine ignition coil for directly supplying a high voltage to an ignition plug to which the prior art is applied.
In FIG. 4, an ignition coil for directly supplying a high voltage to an ignition plug has a primary current input section 12 and an igniter 13 for turning on / off the primary current in an upper storage section 11b of a case 11. There is. A secondary coil 1 in which a secondary copper wire is wound around a secondary bobbin 16 coaxially with the central iron core 18.
7, a primary coil 15 in which a primary copper wire is wound around a primary bobbin 14, and an exterior iron core 19 formed in a cylindrical shape and having a cutout portion in a part of its circumference are sequentially arranged. The central iron core 18 is provided at both ends with magnets 21-21 that generate a magnetic flux in a direction opposite to the magnetic flux m generated in the primary coil 15 in order to suppress saturation of the magnetic flux of the iron core. The secondary high-voltage terminal 22 is provided, and the secondary high-voltage terminal 22 is electrically connected to the secondary coil 17 and the spring 23 in the high-voltage tower section 11 a provided in the case 11, and the epoxy resin 51 is provided through the opening in the upper part of the case 11. Inject and fill to cure
Insulated and sealed. Further, the high voltage tower section 11a is provided with a protector 25 so that a high voltage does not leak to a metal part such as a plug hole (not shown).
【０００５】点火コイル動作時にはイグナイタ１３のス
イッチングにより、１次電流入力部１２から１次電流が
入力され、１次コイル１５に通電され、１次コイル１５
で磁気エネルギーが発生する。発生した磁気エネルギー
は、中心鉄芯１８と外装鉄芯１９を伝搬し、保持され
る。さらに中心鉄芯１８の両端に永久磁石２１を配置し
て、磁気エネルギーを増大させている。点火のタイミン
グで前記イグナイタ１３のスイッチングにより１次電流
が遮断されると、先の保持されていた磁界のエネルギー
は、鉄芯を介した１次コイル１５と２次コイル１７の電
磁誘導により高電圧となって２次コイル１７で発生す
る。発生した高電圧は前記２次コイル１７から２次高圧
端子２２を通り前記スプリング２３を通して図示しない
点火プラグに送りこまれる。During operation of the ignition coil, the primary current is input from the primary current input section 12 by the switching of the igniter 13, and the primary coil 15 is energized and the primary coil 15 is energized.
Generates magnetic energy. The generated magnetic energy propagates through the central iron core 18 and the exterior iron core 19 and is retained. Further, permanent magnets 21 are arranged at both ends of the central iron core 18 to increase magnetic energy. When the primary current is cut off by the switching of the igniter 13 at the ignition timing, the energy of the previously held magnetic field becomes a high voltage due to the electromagnetic induction of the primary coil 15 and the secondary coil 17 through the iron core. Is generated in the secondary coil 17. The generated high voltage is sent from the secondary coil 17 to the spark plug (not shown) through the secondary high voltage terminal 22 and the spring 23.
【０００６】前述のような点火プラグに高電圧を直接供
給する点火コイルは、エンジンのプラグホール内に収納
でき、エンジンに対し点火コイルの占めるスペースを縮
小出来るものである。しかし、低燃費・低公害の自動車
が要求される中、点火コイルにおいては更なる小型化と
出力向上が要求されている。The ignition coil for directly supplying a high voltage to the ignition plug as described above can be housed in the plug hole of the engine and the space occupied by the ignition coil with respect to the engine can be reduced. However, as automobiles with low fuel consumption and low pollution are required, further miniaturization and output improvement of the ignition coil are required.
【０００７】以上のような状況下において、中心鉄芯１
８と、当該中心鉄芯１８に同軸的に２次ボビン１６に２
次銅線を巻き廻した２次コイル１７をケース１１内に収
納し、同じく中心鉄芯１８に同軸的にケース１１外周に
１次銅線を巻き廻した１次コイル１５と、これら中心鉄
芯１８、２次コイル１７、ケース１１、１次コイル１５
の外側に外装鉄芯１９を配置した点火コイルが提案され
ている。図５に従来の技術を適用した点火プラグに高電
圧を直接供給する点火コイルの１次ボビンを廃止し、ケ
ース外周に１次銅線を巻き廻した内燃機関用点火コイル
の図を示す。また図６に中心鉄芯の外周に緩衝テープを
巻き廻した図を示す。図５によれば、本点火コイルはケ
ース１１の上部収納部１１ｂに１次電圧入力部１２を装
着し、場合によっては１次電流をオン−オフするイグナ
イタ１３を収納し、当該ケース１１内側には中心鉄芯１
８と中心鉄芯１８と同軸的に２次ボビン１６に２次銅線
を巻き廻した２次コイル１７を収納し、当該中心鉄芯１
８は両端に、鉄芯の磁束の飽和を抑制するために１次コ
イル１５で発生する磁束と反対方向の磁束を発生させる
磁石２１−２１を装着してある。ケース１１内底部には
図示しない点火プラグに高電圧を供給するために２次高
圧端子２２が設けられ、当該２次高圧端子２２は前記２
次コイル１７と電気的に接続している。そしてケース１
１上部の開口部からエポキシ樹脂５１を注入充填して硬
化させ、絶縁封止する。さらにケース１１に設けられた
１次ボビン部１４ａに１次巻き線を巻き廻して１次コイ
ル１５を形成し、１次コイル１５は１次電圧入力部１２
と電気的に接続する。１次コイル１５表面は、耐熱絶縁
材３０ａで保護され、この耐熱絶縁材３０ａは耐熱絶縁
テープ、シリコン、フッ素系ゴム、耐熱絶縁熱収縮チュ
ーブの少なくとも一つを使用する、その外側に外装鉄芯
１９を組み付ける。当該外装鉄芯１９は、円筒形状に形
作られその円周の一部に切り欠き部を有し、その切り欠
き部を押し広げようとする力に対してバネ力を持たせて
ある。そのバネ力で場合によっては耐熱絶縁材で保護さ
れた１次コイル１５の巻き線表面上に装着し固定する。
次に外装鉄芯１９外側に耐熱絶縁材３０ｂを組み付け
る。耐熱絶縁材３０ｂとして、熱収縮チューブ、フッ素
系ゴム、シリコンのうち少なくとも１つを使用し耐熱
的、耐電圧的に保護する。Under the above circumstances, the central iron core 1
8 to the secondary bobbin 16 coaxially with the central iron core 18.
The secondary coil 17 having the secondary copper wire wound therein is housed in the case 11, and the primary coil 15 having the primary copper wire wound around the outer periphery of the case 11 coaxially with the central iron core 18 and the central iron core 18, secondary coil 17, case 11, primary coil 15
An ignition coil has been proposed in which the exterior iron core 19 is arranged outside the. FIG. 5 shows a diagram of an internal combustion engine ignition coil in which a primary bobbin of an ignition coil for directly supplying a high voltage to an ignition plug to which a conventional technique is applied is abolished and a primary copper wire is wound around the outer circumference of the case. FIG. 6 shows a diagram in which a buffer tape is wound around the outer circumference of the central iron core. According to FIG. 5, the ignition coil includes a primary voltage input section 12 mounted in an upper storage section 11b of a case 11, an igniter 13 for turning on / off a primary current in some cases, and an inside of the case 11. Is the central iron core 1
8 and a central iron core 18, a secondary coil 17 in which a secondary copper wire is wound around a secondary bobbin 16 is housed coaxially with the central iron core 1.
8, magnets 21-21 for generating a magnetic flux in the opposite direction to the magnetic flux generated in the primary coil 15 are attached to both ends in order to suppress saturation of the magnetic flux of the iron core. A secondary high voltage terminal 22 is provided on the inner bottom of the case 11 to supply a high voltage to a spark plug (not shown).
It is electrically connected to the next coil 17. And case 1
1. Epoxy resin 51 is injected and filled from the opening in the upper part of 1 to cure and insulate. Further, the primary winding is wound around the primary bobbin portion 14a provided in the case 11 to form the primary coil 15, and the primary coil 15 is the primary voltage input portion 12
To be electrically connected to. The surface of the primary coil 15 is protected by a heat-resistant insulating material 30a, and this heat-resistant insulating material 30a uses at least one of heat-resistant insulating tape, silicon, fluorine-based rubber, and heat-resistant insulating heat-shrinkable tube. Assemble 19. The exterior iron core 19 is formed into a cylindrical shape and has a cutout portion in a part of its circumference, and has a spring force against the force for expanding the cutout portion. The spring force attaches and fixes on the winding surface of the primary coil 15 protected by a heat resistant insulating material in some cases.
Next, the heat-resistant insulating material 30b is attached to the outside of the exterior iron core 19. As the heat-resistant insulating material 30b, at least one of a heat-shrinkable tube, a fluorine-based rubber, and silicon is used to protect it in heat resistance and withstand voltage.
【０００８】上述の点火コイルは、ケースに１次ボビン
部を設けたことにより従来の１次ボビンの肉厚分が廃止
され、そのスペース分に巻き線径を大きく取ったり、外
装鉄芯断面積を増やしたりし、２次出力エネルギーを向
上することができたり、従来と巻き線径や、外装鉄芯断
面積を同じにするなら１次ボビンの肉厚分点火コイル外
形を小型化できるものである。In the ignition coil described above, the thickness of the conventional primary bobbin is eliminated by providing the primary bobbin portion in the case, the winding diameter is increased to the space, and the outer iron core cross-sectional area is increased. It is possible to increase the secondary output energy and to reduce the outer diameter of the ignition coil by the thickness of the primary bobbin if the winding diameter and external iron core cross-sectional area are the same as the conventional one. is there.
【０００９】[0009]
【発明が解決しようとする課題】前記従来の内燃機関用
点火コイルでは、絶縁注型剤としてエポキシ樹脂５１を
ケース上部の開口部より注入し硬化させているが、中心
鉄芯１８周辺へ流入したエポキシ樹脂５１は、中心鉄芯
１８とエポキシ樹脂５１の熱膨張係数の相違差のため、
点火コイルの経年の冷熱ストレスにより、ひずみ応力が
中心鉄芯とエポキシ樹脂５１に係り中心鉄芯周辺部位に
於けるエポキシ樹脂のクラックが発生する。In the conventional ignition coil for an internal combustion engine, the epoxy resin 51 as an insulating casting agent is injected from the opening in the upper part of the case and hardened, but it flows into the periphery of the central iron core 18. Since the epoxy resin 51 has a difference in thermal expansion coefficient between the central iron core 18 and the epoxy resin 51,
Due to the aged cooling stress of the ignition coil, the strain stress is related to the central iron core and the epoxy resin 51, and cracks of the epoxy resin occur around the central iron core.
【００１０】点火コイルの２次出力が４０ｋＶとすると
点火動作時の中心鉄芯は、およそ２０ｋＶに帯電してい
るため、これよりエポキシ樹脂のクラック発生周囲の絶
縁耐圧が低下し、高電圧の発生する２次コイル１７周辺
のリークなどにより点火コイルの不具合を引き起こす。
このため図６のように中心鉄芯１８の応力緩和として、
中心鉄芯外周をシート状の緩衝材１８ａで覆い対策を施
してしている。これは図６（ａ）のように緩衝材１８ａ
を中心鉄芯１８の円柱側面の外周を覆い隠すように３周
以上巻廻すことで形成し、点火コイル組み込み時のエポ
キシ樹脂５１との熱膨張係数の相違差を緩和をするもの
である。こうして図６（ｂ）のように、中心鉄芯１８に
緩衝材１８ａを装着する。When the secondary output of the ignition coil is 40 kV, the central iron core during the ignition operation is charged to about 20 kV, so that the insulation withstand voltage around the cracks in the epoxy resin is reduced and a high voltage is generated. The ignition coil malfunctions due to leakage around the secondary coil 17.
Therefore, as shown in FIG. 6, as stress relaxation of the central iron core 18,
The outer periphery of the central iron core is covered with a sheet-shaped cushioning material 18a to take measures. This is the cushioning material 18a as shown in FIG.
Is formed by winding three times or more so as to cover the outer circumference of the cylindrical side surface of the central iron core 18, and alleviates the difference in thermal expansion coefficient from the epoxy resin 51 when the ignition coil is incorporated. Thus, as shown in FIG. 6B, the cushioning material 18a is attached to the central iron core 18.
【００１１】しかしながら、中心鉄芯１８外周を緩衝材
１８ａで覆う作業に組立工数がかかり、また中心鉄芯外
周を緩衝材で完全に覆うことをもってしても、経年の冷
熱ストレスによる中心鉄芯周辺部位に於けるエポキシ樹
脂のクラックの発生を完全にはくい止めることができな
い。However, it takes a lot of assembly work to cover the outer periphery of the central iron core 18 with the cushioning material 18a, and even if the outer periphery of the central iron core is completely covered with the cushioning material, the periphery of the central iron core is caused by the cold heat stress of the years. It is not possible to completely prevent the cracking of the epoxy resin at the part.
【００１２】本発明は、上記課題を鑑みてなされたもの
で、エンジンのプラグホール内に装着され、点火プラグ
に高電圧を供給する内燃機関用点火コイルにおいて、信
頼性の高い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 made in view of the above problems, and is an internal combustion engine ignition coil that is installed in a plug hole of an engine and supplies a high voltage to an ignition plug. The purpose is to provide.
【００１３】[0013]
【課題を解決するための手段】上記の課題を解決するた
め本発明の内燃機関用点火装置は、次のような構成とす
る。すなわち請求項１では、中心鉄芯と、当該中心鉄芯
に同軸的に２次ボビンに２次銅線を巻き廻した２次コイ
ルをケース内に収納し、同じく中心鉄芯に同軸的にケー
ス外周に１次銅線を巻き廻した１次コイルと、これら中
心鉄芯、２次コイル、ケースと、１次コイルの外側に外
装鉄芯を配置した内燃機関用点火コイルにおいて、前記
中心鉄芯は２次ボビン内に収容され、当該２次ボビン端
部の一端はケース開口端まで達し、絶縁注型材をケース
内の２次ボビン外周部に注入し、前記中心鉄芯は中心に
突起部のあるケース開口端を閉口するカバーの突起部に
て固定したことを特徴とする内燃機関用点火コイルとす
る。また請求項２では、中心鉄芯と、当該中心鉄芯と同
軸的に２次ボビンに２次銅線を巻回した２次コイルと、
１次ボビンに１次銅線を巻回した１次コイルと、円筒形
状に形作られその円周の一部に切り欠き部を有する外装
鉄芯とを順にケース内に配置し収納した内燃機関用点火
コイルにおいて、前記中心鉄芯は２次ボビン内に収容さ
れ、当該２次ボビン端部はケース開口端まで達し、絶縁
注型材をケース内の２次ボビン外周部に注入し、前記中
心鉄芯は突起部のあるケース開口端を閉口するカバーの
突起部にて固定したことを特徴とする内燃機関用点火コ
イルとする。また請求項３では、ケースに電源電圧を供
給する１次電流入力部を装着し、１次コイルの１次電流
をオン−オフするイグナイタをケース内に収納すること
を特徴とする請求項１乃至２記載の内燃機関用点火コイ
ルとする。In order to solve the above problems, an internal combustion engine ignition device of the present invention has the following configuration. That is, in claim 1, the central iron core and the secondary coil in which a secondary copper wire is wound around a secondary bobbin coaxially with the central iron core are housed in a case, and the central iron core is also coaxial with the case. A primary coil having a primary copper wire wound around the outer periphery thereof, a central iron core, a secondary coil, a case, and an ignition coil for an internal combustion engine in which an exterior iron core is arranged outside the primary coil. Is housed in a secondary bobbin, one end of the secondary bobbin end reaches the opening end of the case, and an insulating casting material is injected into the outer peripheral part of the secondary bobbin in the case, and the central iron core is provided with a protrusion part at the center. An ignition coil for an internal combustion engine, wherein an opening end of a case is fixed by a protruding portion of a cover that closes. Further, in claim 2, a central iron core, and a secondary coil in which a secondary copper wire is wound around a secondary bobbin coaxially with the central iron core,
For a internal combustion engine in which a primary coil in which a primary copper wire is wound around a primary bobbin and an exterior iron core which is formed into a cylindrical shape and has a cutout portion in a part of its circumference are sequentially arranged and housed in a case In the ignition coil, the central iron core is housed in a secondary bobbin, the end of the secondary bobbin reaches the opening end of the case, and an insulating casting material is injected into the outer peripheral portion of the secondary bobbin in the case to form the central iron core. Is an ignition coil for an internal combustion engine, characterized in that an opening end of a case having a projection is fixed by a projection of a cover that closes. According to a third aspect of the present invention, a primary current input section for supplying a power supply voltage is attached to the case, and an igniter for turning on / off the primary current of the primary coil is housed in the case. The ignition coil for an internal combustion engine according to 2.
【００１４】[0014]
【実施例】図１に本発明の技術を適用した実施例１を示
す点火プラグに高電圧を直接供給する内燃機関用点火コ
イルの図を示す。図２に図１の上部収納部の拡大図を示
す。また図３に本発明の技術を適用した実施例１を示す
点火プラグに高電圧を直接供給する内燃機関用点火コイ
ルのケース外周に１次銅線を巻き廻した内燃機関用点火
コイルの上部収納部にイグナイタを内蔵した拡大図を示
す。Embodiment 1 FIG. 1 is a diagram showing an ignition coil for an internal combustion engine for directly supplying a high voltage to an ignition plug showing an embodiment 1 to which the technique of the present invention is applied. FIG. 2 shows an enlarged view of the upper storage portion of FIG. FIG. 3 shows the first embodiment to which the technique of the present invention is applied. The ignition coil for internal combustion engine, which supplies a high voltage directly to an ignition plug, has a primary copper wire wound around the outer periphery of the case to house the ignition coil for internal combustion engine above. An enlarged view of a built-in igniter is shown.
【００１５】本発明の内燃機関用点火コイルは、図１に
おいて、点火コイルは、次のような構成としている。中
心鉄芯１８と、当該中心鉄芯１８に同軸的に２次ボビン
１６に２次銅線を巻き廻した２次コイル１７をケース１
１内に収納し、同じく中心鉄芯１８に同軸的にケース１
１外側の１次ボビン部１４ａに１次銅線を巻き廻した１
次コイル１５と、これら中心鉄芯１８、２次コイル１
７、ケース１１、１次コイル１５の外側に外装鉄芯１９
を配置した点火コイルである。本点火コイルはケース１
１の上部収納部１１ｂに１次電圧入力部１２を装着し、
当該ケース１１内側には中心鉄芯１８と中心鉄芯１８と
同軸的に組み付け時にケース上端まで延びるボビン端部
を有する２次ボビン１６に２次銅線を巻き廻した２次コ
イル１７を収納し、当該中心鉄芯１８の両端には、鉄芯
の磁束の飽和を抑制するために１次コイル１５で発生す
る磁束と反対方向の磁束を発生させる永久磁石２１−２
１を装着してある。ケース１１内底部には図示しない点
火プラグに高電圧を供給するために２次高圧端子２２が
設けられ、スプリング２３と接続されている。当該２次
高圧端子２２は前記２次コイル１７と電気的に接続して
いる。そしてケース１１上部の開口部（以下「ケース開
口端１１ｃ」と呼ぶ）からエポキシ樹脂５１を２次ボビ
ン外周部の周辺に注入充填して硬化させ、絶縁封止す
る。絶縁封止したのち、２次ボビン１６の端部の内径を
覆い中心鉄芯１８を固定する突起部４１ａを設けたカバ
ー４１をケース開口端１１ｃを閉口するよう装着し、溶
着、溶接などで、ケース１１との接合を行う。さらに前
記高圧タワー部１１ａには、図示しないプラグホール等
の金属部に高電圧がリークしないようにプロテクタ２５
を備える。The ignition coil for an internal combustion engine of the present invention has the following structure in FIG. Case 1 includes a central iron core 18 and a secondary coil 17 in which a secondary copper wire is wound around a secondary bobbin 16 coaxially with the central iron core 18.
It is housed in 1 and is also coaxial with the central iron core 18
1 A primary copper wire is wound around the outer primary bobbin portion 14a 1
Secondary coil 15, central iron core 18, secondary coil 1
7, case 11, outer coil 19 on the outside of the primary coil 15
Is an ignition coil. This ignition coil is case 1
Attach the primary voltage input section 12 to the upper storage section 11b of 1,
Inside the case 11, a secondary coil 17 having a secondary copper wire wound around a secondary bobbin 16 having a central iron core 18 and a bobbin end extending to the upper end of the case when assembled coaxially with the central iron core 18 is housed. , Permanent magnets 21-2 that generate magnetic flux in the opposite direction to the magnetic flux generated in the primary coil 15 in order to suppress saturation of the magnetic flux of the iron core at both ends of the central iron core 18.
I wear 1. A secondary high voltage terminal 22 for supplying a high voltage to a spark plug (not shown) is provided on the inner bottom of the case 11 and is connected to a spring 23. The secondary high voltage terminal 22 is electrically connected to the secondary coil 17. Then, the epoxy resin 51 is injected and filled into the periphery of the outer peripheral portion of the secondary bobbin from the opening (hereinafter, referred to as “case opening end 11c”) in the upper portion of the case 11 to cure and insulate. After insulating and sealing, the cover 41 provided with the protrusion 41a that covers the inner diameter of the end of the secondary bobbin 16 and fixes the central iron core 18 is attached so as to close the case opening end 11c, and by welding, welding, etc. Joining with the case 11 is performed. Further, the high voltage tower section 11a has a protector 25 for preventing high voltage from leaking to a metal part such as a plug hole (not shown).
Equipped with.
【００１６】さらに前記ケース１１の１次ボビン部１４
ａに１次巻き線を巻き廻し、１次コイル１５を形成し１
次コイル１５は１次電圧入力部１２と電気的に接続す
る。１次コイル１５表面は、耐熱絶縁材３０ａで保護さ
れ、この耐熱絶縁材３０ａは耐熱絶縁テープ、シリコ
ン、フッ素系ゴム、耐熱絶縁熱収縮チューブの少なくと
も一つを使用する、その外側に外装鉄芯１９を組み付け
る。当該外装鉄芯１９は、円筒形状に形作られその円周
の一部に切り欠き部を有し、その切り欠き部を押し広げ
ようとする力に対してバネ力を持たせてある。そのバネ
力で場合によっては耐熱絶縁材３０ａで保護された１次
コイル１５上に装着し固定する。さらに外装鉄芯１９外
側に耐熱絶縁材３０ｂを組み付ける。当該耐熱絶縁材３
０ｂとして、熱収縮チューブ、フッ素系ゴム、シリコン
のうち少なくとも１つを使用し耐熱的、耐電圧的に外装
鉄芯１９を保護する。Further, the primary bobbin portion 14 of the case 11
A primary winding is wound around a to form a primary coil 15
The secondary coil 15 is electrically connected to the primary voltage input section 12. The surface of the primary coil 15 is protected by a heat-resistant insulating material 30a, and this heat-resistant insulating material 30a uses at least one of heat-resistant insulating tape, silicon, fluorine-based rubber, and heat-resistant insulating heat-shrinkable tube. Assemble 19. The exterior iron core 19 is formed into a cylindrical shape and has a cutout portion in a part of its circumference, and has a spring force against the force for expanding the cutout portion. The spring force attaches and fixes on the primary coil 15 protected by the heat-resistant insulating material 30a depending on the case. Further, a heat resistant insulating material 30b is attached to the outside of the exterior iron core 19. Heat resistant insulation material 3
As 0b, at least one of a heat-shrinkable tube, a fluorine-based rubber, and silicon is used to protect the outer iron core 19 in heat resistance and withstand voltage.
【００１７】また場合によっては図３のように１次電流
をオン−オフするイグナイタ１３をケース内に収納する
ため、ケースの上部収納部１１ｂ内にイグナイタ１３を
任意の配置方向に配置する。このとき前記イグナイタ１
３の各端子と電源やコイルとの電気配線を導電性の平端
子１３aでおこなう。In some cases, as shown in FIG. 3, the igniter 13 for turning on / off the primary current is housed in the case. Therefore, the igniter 13 is arranged in the upper housing portion 11b of the case in an arbitrary arrangement direction. At this time, the igniter 1
Electrical wiring between each terminal of 3 and the power supply and the coil is performed by the conductive flat terminal 13a.
【００１８】図３（ａ）のように点火コイル上部から見
ると、イグナイタ１３を上部収納部１１ｂ内に、中心鉄
芯１８を中心に１次電流入力部１２と反対側に位置する
よう配置した場合、イグナイタ１３と各部の電気配線を
導電性の平端子１３ａは、中心鉄芯１８を中心として中
心鉄芯１８に沿うよう上部収納部１１ｂ内に１次電圧入
力部１２まで配線される。As seen from the upper part of the ignition coil as shown in FIG. 3A, the igniter 13 is arranged in the upper housing portion 11b so as to be located on the side opposite to the primary current input portion 12 with the central iron core 18 as the center. In this case, the igniter 13 and the electrically conductive flat terminals 13a of the respective parts are wired up to the primary voltage input part 12 in the upper housing part 11b with the central iron core 18 as the center and along the central iron core 18.
【００１９】上述のように本発明は、ケース内に２次コ
イルを収納し、ケース外周に１次コイルを形成した点火
コイルに適用されたが、本発明の技術を従来の技術にあ
ったようなケース内に１次コイル、２次コイルを収納し
た内燃機関用点火コイルに用いてもよい。As described above, the present invention is applied to the ignition coil in which the secondary coil is housed in the case and the primary coil is formed on the outer circumference of the case. However, the technique of the present invention is the same as the conventional technique. It may be used as an ignition coil for an internal combustion engine in which a primary coil and a secondary coil are housed in a different case.
【００２０】[0020]
【発明の効果】以上のように、本発明の技術を内燃機関
用点火コイルに適用することで、２次ボビン内の中心鉄
芯部周囲は、エポキシ樹脂が存在しないため、前述のよ
うな中心鉄芯外周を緩衝材で覆う対策を施す必要がな
く、組立工数の低減と中心鉄芯周辺部位に於けるエポキ
シ樹脂のクラック対策できるので、信頼性の高い内燃機
関用点火コイルを提供することができる。As described above, by applying the technique of the present invention to the ignition coil for the internal combustion engine, since the epoxy resin does not exist around the central iron core portion in the secondary bobbin, the above-mentioned center Since there is no need to take measures to cover the outer periphery of the iron core with a cushioning material, the number of assembly steps can be reduced and the epoxy resin cracks around the central iron core can be prevented, so that it is possible to provide a highly reliable ignition coil for an internal combustion engine. it can.
【図１】 本発明の技術を適用した実施例１を示す点火
プラグに高電圧を直接供給する内燃機関用点火コイルの
ケース外周に１次銅線を巻き廻した内燃機関用点火コイ
ルの図である。FIG. 1 is a diagram of an ignition coil for an internal combustion engine in which a primary copper wire is wound around an outer periphery of a case of the ignition coil for an internal combustion engine that directly supplies a high voltage to an ignition plug, showing a first embodiment to which the technique of the present invention is applied. is there.
【図２】 図１の上部収納部の拡大図である。FIG. 2 is an enlarged view of an upper storage portion of FIG.
【図３】 本発明の技術を適用した実施例１を示す点火
プラグに高電圧を直接供給する内燃機関用点火コイルの
ケース外周に１次銅線を巻き廻した内燃機関用点火コイ
ルの上部収納部にイグナイタを内蔵した拡大図である。FIG. 3 shows an embodiment 1 to which the technique of the present invention is applied. An internal combustion engine ignition coil in which a primary copper wire is wound around the outer periphery of a case of an internal combustion engine ignition coil that directly supplies a high voltage to an ignition plug is housed in the upper part. FIG. 7 is an enlarged view in which an igniter is built in a part.
【図４】 従来技術を適用したケース内に１次コイル、
２次コイルを収納した、点火プラグに高電圧を直接供給
する内燃機関用点火コイルの図である。FIG. 4 shows a primary coil in a case to which a conventional technique is applied,
FIG. 3 is a diagram of an internal combustion engine ignition coil that houses a secondary coil and that directly supplies a high voltage to an ignition plug.
【図５】 従来の技術を適用した点火プラグに高電圧を
直接供給する点火コイルの１次ボビンを廃止し、ケース
外周に１次銅線を巻き廻した内燃機関用点火コイルの図
である。FIG. 5 is a diagram of an internal combustion engine ignition coil in which a primary bobbin of an ignition coil that directly supplies a high voltage to an ignition plug to which a conventional technique is applied is eliminated and a primary copper wire is wound around an outer circumference of a case.
【図６】 中心鉄芯の外周に緩衝テープを巻き廻す様子
を示した図である。FIG. 6 is a view showing a state in which a buffer tape is wound around the outer circumference of a central iron core.
図において同一符号は同一、又は相当部分を示す。 １１ ケース １１ａ 高圧タワー部 １１ｂ 上部収納部 １１ｃ ケース開口端 １２ １次電流入力部 １３ イグナイタ １３ａ 平端子 １４ １次ボビン １４ａ １次ボビン部 １５ １次コイル １６ ２次ボビン １７ ２次コイル １８ 中心鉄芯 １８ａ 緩衝テープ １９ 外装鉄芯 ２１ 永久磁石 ２２ ２次高圧端子 ２３ スプリング ２５ プロテクタ ３０ａ 耐熱絶縁材 ３０ｂ 耐熱絶縁材 ４１ カバー ４１ａ 突起部 ５１ エポキシ樹脂 In the drawings, the same reference numerals indicate the same or corresponding parts. 11 cases 11a High-voltage tower section 11b Upper storage 11c Case opening end 12 Primary current input section 13 Igniter 13a Flat terminal 14 Primary bobbin 14a Primary bobbin section 15 Primary coil 16 Secondary bobbin 17 Secondary coil 18 center iron core 18a buffer tape 19 Exterior iron core 21 Permanent magnet 22 Secondary high voltage terminal 23 spring 25 protector 30a heat resistant insulation 30b heat resistant insulation 41 cover 41a protrusion 51 Epoxy resin
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｆ 31/00 ５０１Ｊ ５０１Ｋ ５０１Ｌ Front page continuation (51) Int.Cl. 7 Identification code FI theme code (reference) H01F 31/00 501J 501K 501L
Claims (3)
ボビンに２次銅線を巻き廻した２次コイルをケース内に
収納し、同じく中心鉄芯に同軸的にケース外周に１次銅
線を巻き廻した１次コイルと、これら中心鉄芯、２次コ
イル、ケースと、１次コイルの外側に外装鉄芯を配置し
た内燃機関用点火コイルにおいて、前記中心鉄芯は２次
ボビン内に収容され、当該２次ボビン端部の一端はケー
ス開口端まで達し、絶縁注型材をケース内の２次ボビン
外周部に注入し、前記中心鉄芯は中心に突起部のあるケ
ース開口端を閉口するカバーの突起部にて固定したこと
を特徴とする内燃機関用点火コイル。1. A central iron core and a secondary coil in which a secondary copper wire is wound around a secondary bobbin coaxially with the central iron core are housed in a case, and the outer circumference of the case is also coaxial with the central iron core. In a primary coil having a primary copper wire wound around it, a central iron core, a secondary coil, a case, and an ignition coil for an internal combustion engine in which an exterior iron core is arranged outside the primary coil, the central iron core is It is accommodated in a secondary bobbin, one end of the end of the secondary bobbin reaches the opening end of the case, and an insulating casting material is injected into the outer periphery of the secondary bobbin in the case, and the central iron core has a protrusion at the center. An ignition coil for an internal combustion engine, characterized in that the opening end of the case is fixed by a protrusion of a cover.
ボビンに２次銅線を巻回した２次コイルと、１次ボビン
に１次銅線を巻回した１次コイルと、円筒形状に形作ら
れその円周の一部に切り欠き部を有する外装鉄芯とを順
にケース内に配置し収納した内燃機関用点火コイルにお
いて、前記中心鉄芯は２次ボビン内に収容され、当該２
次ボビン端部はケース開口端まで達し、絶縁注型材をケ
ース内の２次ボビン外周部に注入し、前記中心鉄芯は突
起部のあるケース開口端を閉口するカバーの突起部にて
固定したことを特徴とする内燃機関用点火コイル。2. A central iron core, a secondary coil in which a secondary copper wire is wound around a secondary bobbin coaxially with the central iron core, and a primary coil in which a primary copper wire is wound around a primary bobbin. In an ignition coil for an internal combustion engine, which has a cylindrical shape and an exterior iron core having a notch in a part of its circumference, which are sequentially arranged and housed in a case, the central iron core is housed in a secondary bobbin. And 2
The end of the next bobbin reaches the opening end of the case, the insulating casting material is injected into the outer periphery of the secondary bobbin in the case, and the central iron core is fixed by the protrusion of the cover closing the opening end of the case with the protrusion. An ignition coil for an internal combustion engine characterized by the above.
部を装着し、１次コイルの１次電流をオン−オフするイ
グナイタをケース内に収納することを特徴とする請求項
１乃至２記載の内燃機関用点火コイル。3. A primary current input section for supplying a power supply voltage to the case, and an igniter for turning on / off the primary current of the primary coil is housed in the case. An ignition coil for an internal combustion engine as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001198934A JP2003017342A (en) | 2001-06-29 | 2001-06-29 | Ignition coil for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001198934A JP2003017342A (en) | 2001-06-29 | 2001-06-29 | Ignition coil for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003017342A true JP2003017342A (en) | 2003-01-17 |
Family
ID=19036291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001198934A Pending JP2003017342A (en) | 2001-06-29 | 2001-06-29 | Ignition coil for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003017342A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006066881A (en) * | 2004-07-27 | 2006-03-09 | Denso Corp | Stick ignition coil |
| JP2006291760A (en) * | 2005-04-07 | 2006-10-26 | Hanshin Electric Co Ltd | Ignition coil for internal combustion engine |
| JP2010101257A (en) * | 2008-10-24 | 2010-05-06 | Diamond Electric Mfg Co Ltd | Ignition coil |
| JP2013125949A (en) * | 2011-12-16 | 2013-06-24 | Denso Corp | Ignition coil for internal combustion engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6130226U (en) * | 1984-07-25 | 1986-02-24 | 株式会社デンソー | Ignition coil for internal combustion engine |
| JPH06163288A (en) * | 1992-11-25 | 1994-06-10 | Tdk Corp | Ignition transformer |
| JPH0897057A (en) * | 1994-09-26 | 1996-04-12 | Nippondenso Co Ltd | Ignition coil |
| JP2001167953A (en) * | 1999-12-14 | 2001-06-22 | Diamond Electric Mfg Co Ltd | Ignition coil |
-
2001
- 2001-06-29 JP JP2001198934A patent/JP2003017342A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6130226U (en) * | 1984-07-25 | 1986-02-24 | 株式会社デンソー | Ignition coil for internal combustion engine |
| JPH06163288A (en) * | 1992-11-25 | 1994-06-10 | Tdk Corp | Ignition transformer |
| JPH0897057A (en) * | 1994-09-26 | 1996-04-12 | Nippondenso Co Ltd | Ignition coil |
| JP2001167953A (en) * | 1999-12-14 | 2001-06-22 | Diamond Electric Mfg Co Ltd | Ignition coil |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006066881A (en) * | 2004-07-27 | 2006-03-09 | Denso Corp | Stick ignition coil |
| JP4701835B2 (en) * | 2004-07-27 | 2011-06-15 | 株式会社デンソー | Stick type ignition coil |
| JP2006291760A (en) * | 2005-04-07 | 2006-10-26 | Hanshin Electric Co Ltd | Ignition coil for internal combustion engine |
| JP2010101257A (en) * | 2008-10-24 | 2010-05-06 | Diamond Electric Mfg Co Ltd | Ignition coil |
| JP2013125949A (en) * | 2011-12-16 | 2013-06-24 | Denso Corp | Ignition coil for internal combustion engine |
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