JP2787430B2 - Ignition coil for internal combustion engine - Google Patents
Ignition coil for internal combustion engineInfo
- Publication number
- JP2787430B2 JP2787430B2 JP7349473A JP34947395A JP2787430B2 JP 2787430 B2 JP2787430 B2 JP 2787430B2 JP 7349473 A JP7349473 A JP 7349473A JP 34947395 A JP34947395 A JP 34947395A JP 2787430 B2 JP2787430 B2 JP 2787430B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- coil
- resin layer
- magnetic circuit
- open magnetic
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、エンジンの各気
筒に設けられたプラグホールに挿入し、プラグホールの
底にある点火プラグの頭部端子に高圧端子を押付け、点
火プラグに高電圧を印加する細長い筒形の点火コイルに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage terminal which is inserted into a plug hole provided in each cylinder of an engine, presses a high-voltage terminal against a head terminal of the ignition plug at the bottom of the plug hole, and applies a high voltage to the ignition plug. The present invention relates to an elongated tubular ignition coil.
【０００２】[0002]
【従来の技術】このように使用する細長い点火プラグと
して、閉鎖した前端部に高圧端子を有する細長い筒形の
樹脂ケースの内部の中心に開磁路鉄心、その外に同心状
に内側に１次コイル、外側に２次コイルを配置すると共
に、開磁路鉄心の一端、又は両端に永久磁石を当接し、
前記樹脂ケース中に注型した熱硬化性絶縁樹脂層中に開
磁路鉄心と、その端面に当接した永久磁石、及び１次コ
イル、２次コイルを固定したものが実開平４−２４６６
９号公報により公知である。2. Description of the Related Art As an elongated spark plug used in this way, an open magnetic circuit iron core is provided at the center of an elongated cylindrical resin case having a high-voltage terminal at a closed front end, and a concentric inner primary is provided outside the core. A coil, a secondary coil is arranged outside, and a permanent magnet is in contact with one or both ends of the open magnetic circuit core,
In the thermosetting insulating resin layer cast in the resin case, an open magnetic circuit core, a permanent magnet in contact with an end surface thereof, and a primary coil and a secondary coil are fixed.
No. 9 discloses this.
【０００３】[0003]
【発明が解決しようとする課題】しかし、開磁路鉄心や
永久磁石と、熱硬化性絶縁樹脂とは線膨張係数が相違す
るので、点火コイルが熱的経験（低温−４０℃〜高温＋
１３０℃）を繰返し、熱ストレスがかゝると開磁路鉄心
の端面や、永久磁石の端面から絶縁樹脂層中にクラック
が発生、進行して絶縁破壊を起こすことがあり、点火コ
イルの信頼性を低下させる要因になる。However, since the linear expansion coefficient of the open magnetic circuit core or the permanent magnet is different from that of the thermosetting insulating resin, the ignition coil is thermally experienced (low temperature -40 ° C to high temperature +
130 ° C), cracks may occur in the insulating resin layer from the end surface of the open magnetic circuit core or the end surface of the permanent magnet, and the insulation may proceed to cause dielectric breakdown if thermal stress is applied. It becomes a factor to lower the sex.
【０００４】[0004]
【課題を解決するための手段】この発明は、上述した問
題点を解消するために開発されたもので、閉鎖した前端
部に高圧端子と後向きの保持筒部を有する細長い筒形の
樹脂ケースの内部の中心に開磁路鉄心を配置し、開磁路
鉄心の前端部を上記樹脂ケースの閉鎖した前端部の保持
筒部に挿入し、前記開磁路鉄心の途中に、該鉄心よりも
長さが短い１次コイルと２次コイルを、１次コイルを内
側、２次コイルを外側にして同心状に設け、樹脂ケース
内に途中まで注型した熱硬化性絶縁樹脂層中に１次コイ
ルと２次コイル、及び開磁路鉄心の後端部を除いて埋設
し、上記熱硬化性絶縁樹脂層と樹脂ケースの後端との間
に耐クラック性絶縁樹脂層を設け、この耐クラック性樹
脂層中に開磁路鉄心の後端部を埋設したことを特徴とす
る。SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems, and has an elongated cylindrical resin case having a high voltage terminal and a rearward holding cylinder at a closed front end. An open magnetic circuit core is disposed at the center of the inside, and the front end of the open magnetic circuit core is inserted into the holding cylinder portion of the closed front end of the resin case. The primary coil and the secondary coil having a short length are provided concentrically with the primary coil inside and the secondary coil outside, and the primary coil is placed in a thermosetting insulating resin layer which is poured halfway into a resin case. And a secondary coil and an open magnetic circuit core except for the rear end, and a crack-resistant insulating resin layer is provided between the thermosetting insulating resin layer and the rear end of the resin case. It is characterized in that the rear end of the open magnetic circuit core is buried in the resin layer.
【０００５】[0005]
【発明の実施の形態】図示の実施形態において、１は１
次コイル、２は２次コイル、３は開磁路鉄心、４は細長
い筒形の樹脂ケースを示す。開磁路鉄心３は、多数枚の
短冊形硅素鋼板を断面形状が円形に近くなるように積層
して構成した周知のもので、その長さの途中を１次ボビ
ン等の絶縁材で被い、１次コイル１はその絶縁材上に巻
付けてある。２次コイル２は、図では省略したが２次ボ
ビンの外周に分割巻きで巻いてある。１次コイルと２次
コイルは長さが等しく、その長さは閉磁路鉄心の長さよ
り短い。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, 1 is 1
The secondary coil, 2 is a secondary coil, 3 is an open magnetic circuit core, and 4 is an elongated cylindrical resin case. The open-magnetic-path core 3 is a well-known structure formed by laminating a large number of strip-shaped silicon steel sheets so that the cross-sectional shape becomes almost circular, and covers the middle of the length with an insulating material such as a primary bobbin. The primary coil 1 is wound on the insulating material. The secondary coil 2 is wound around the outer periphery of the secondary bobbin in a divided manner, though not shown in the figure. The primary coil and the secondary coil are equal in length, and the length is shorter than the length of the closed magnetic core.
【０００６】樹脂ケース４は閉鎖した前端部５の中心に
高圧端子６を前向きに保持し、高圧端子の前端部はケー
スの前端部５から突出する。高圧端子６は樹脂ケース４
を成形する際にケースの前端部にインサートモールドで
固定してある。樹脂ケースの前端部５の裏には、開磁路
鉄心の前端部を挿入可能な保持筒部７を同心状に後向き
に設けてある。又、樹脂ケース４の後部の一側には複数
の１次端子８の保持部９が一体に設けてある。The resin case 4 holds the high voltage terminal 6 at the center of the closed front end 5 in a forward direction, and the front end of the high voltage terminal protrudes from the front end 5 of the case. High voltage terminal 6 is resin case 4
Is fixed to the front end of the case by insert molding. On the back of the front end 5 of the resin case, a holding cylinder 7 into which the front end of the open magnetic circuit core can be inserted is provided concentrically and rearward. Further, on one side of the rear part of the resin case 4, a holding portion 9 for a plurality of primary terminals 8 is provided integrally.
【０００７】点火コイルを組立てるには、開磁路鉄心３
の前端部を保持筒部７に挿入し、その途中の回りの１次
コイル１の外に２次コイルを同心状に配置し、２次コイ
ルの高圧端を高圧端子５に、２次コイルの低圧端や、１
次コイルの各端部を１次端子８に夫々電気的に接続し、
樹脂ケース４内に熱硬化性エポキシ樹脂などの熱硬化性
絶縁樹脂を真空注型し、少なくとも１次コイルと２次コ
イルの全体、及び開磁路鉄心の途中までを該絶縁樹脂層
１０中に埋設し、この絶縁樹脂層１０の後と、樹脂ケー
スの後端との間に軟質エポキシ樹脂などの耐クラック性
樹脂を常圧注型で充填し、開磁路鉄心３の後端部を耐ク
ラック性樹脂層１１中に埋設する。[0007] To assemble the ignition coil, open core 3
Of the secondary coil is concentrically arranged outside the primary coil 1 around the middle of the holding cylinder 7, and the high voltage end of the secondary coil is connected to the high voltage terminal 5 and the secondary coil is connected to the secondary coil. Low pressure end, 1
Each end of the secondary coil is electrically connected to the primary terminal 8 respectively,
A thermosetting insulating resin such as a thermosetting epoxy resin is vacuum-injected into the resin case 4, and at least the entirety of the primary coil and the secondary coil, and at least halfway through the open magnetic circuit core, are placed in the insulating resin layer 10. A crack-resistant resin such as a soft epoxy resin is filled between the back of the insulating resin layer 10 and the rear end of the resin case by normal pressure casting, and the rear end of the open magnetic circuit core 3 is crack-resistant. Embedded in the conductive resin layer 11.
【０００８】樹脂の注型は、熱硬化性絶縁樹脂を真空注
型し、その熱硬化後に耐クラック性樹脂を常圧注型して
硬化させてもよいが、熱硬化性絶縁樹脂を真空注型後、
すぐに耐クラック性樹脂を注型し、両方の樹脂を同時に
硬化させてもよく、これにより硬化に要する時間を短縮
することができる。The resin may be cast by vacuum-casting a thermosetting insulating resin, and after the thermosetting, a crack-resistant resin may be cast at normal pressure to be cured. rear,
Immediately, the crack-resistant resin may be cast, and both resins may be cured at the same time, thereby shortening the time required for curing.
【０００９】使用するには、図１に示すように、樹脂ケ
ースの前端から同心状に突出する前向き筒１２に電気絶
縁性で、弾力を有する例えば合成ゴム製の筒形ブーツ１
３を嵌めて延長状に保持し、この筒形ブーツを先頭にし
てエンジンのプラグホール１４に挿入し、プラグホール
の底から突出する点火プラグ１５の絶縁体の外に筒形ブ
ーツを弾力的に嵌めることにより高圧端子５を点火プラ
グの頭部端子１６に圧接する。For use, as shown in FIG. 1, an electrically insulating and resilient cylindrical boot 1 made of, for example, synthetic rubber is provided on a forward facing cylinder 12 which projects concentrically from the front end of a resin case.
3 and inserted into the plug hole 14 of the engine with the cylindrical boot at the top, and the cylindrical boot is elastically pulled out of the insulator of the spark plug 15 protruding from the bottom of the plug hole. By fitting, the high voltage terminal 5 is pressed against the head terminal 16 of the ignition plug.
【００１０】[0010]
【発明の効果】以上で明らかなように、本発明では開磁
路鉄心の前端部は樹脂ケースの前端部に設けた後向きの
保持筒部に挿入してあるため、開磁路鉄心の前端面から
熱硬化性絶縁樹脂層中にクラックが発生することがな
い。又、開磁路鉄心の後端部は耐クラック性樹脂層中に
埋設されているので、その後端面からクラックが発生し
ない。従って、絶縁破壊が起きない信頼性の高い点火コ
イルを提供することができる。又、耐クラック性樹脂と
して軟質エポキシ樹脂等の柔らかい樹脂を使用した場
合、例えば点火コイルの１次電流を制御するパワースイ
ッチ等をこの柔らかい樹脂層中に組込むことによって、
パワースイッチ等に加わる熱応力を樹脂で吸収できると
いう効果もある。As is clear from the above, in the present invention, the front end of the open magnetic circuit core is inserted into the rearward holding cylinder provided at the front end of the resin case. Therefore, no crack is generated in the thermosetting insulating resin layer. Also, since the rear end of the open magnetic circuit core is buried in the crack resistant resin layer, no crack is generated from the rear end face. Therefore, it is possible to provide a highly reliable ignition coil in which dielectric breakdown does not occur. When a soft resin such as a soft epoxy resin is used as the crack-resistant resin, for example, a power switch for controlling the primary current of the ignition coil is incorporated in the soft resin layer.
There is also an effect that the thermal stress applied to the power switch and the like can be absorbed by the resin.
【図１】本発明による点火コイルの使用状態の断面図で
ある。FIG. 1 is a sectional view of a use state of an ignition coil according to the present invention.
１ １次コイル ２ ２次コイル ３ 開磁路鉄心 ４ 細長い筒形の樹脂ケース ５ 細長い筒形の樹脂ケースの前端部 ６ 高圧端子 ７ 保持筒部 ８ １次端子 ９ １次端子の保持部 １０ 熱硬化性絶縁樹脂層 １１ 耐クラック性樹脂層 DESCRIPTION OF SYMBOLS 1 Primary coil 2 Secondary coil 3 Open magnetic circuit core 4 Slender cylindrical resin case 5 Front end of slender cylindrical resin case 6 High voltage terminal 7 Holding cylinder part 8 Primary terminal 9 Primary terminal holding part 10 Heat Curable insulating resin layer 11 Crack resistant resin layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０１Ｆ 31/00 ５０１Ｎ (56)参考文献 特開 昭60−192313（ＪＰ，Ａ) 特開 平１−283804（ＪＰ，Ａ) 特開 平７−272952（ＪＰ，Ａ) 実開 昭56−169532（ＪＰ，Ｕ) 実開 昭63−105317（ＪＰ，Ｕ) 実開 昭55−122326（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01F 38/12 F02P 13/00 303 F02P 15/00 303──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 6 Identification symbol FI H01F 31/00 501N (56) References JP-A-60-192313 (JP, A) JP-A-1-283804 (JP, A) JP-A-7-272952 (JP, A) Japanese Utility Model Showa 56-169532 (JP, U) Japanese Utility Model Showa 63-105317 (JP, U) Japanese Utility Model Showa 55-122326 (JP, U) (58) (Int.Cl. 6 , DB name) H01F 38/12 F02P 13/00 303 F02P 15/00 303
Claims (1)
持筒部を有する細長い筒形の樹脂ケースの内部の中心に
開磁路鉄心を配置し、開磁路鉄心の前端部を上記樹脂ケ
ースの閉鎖した前端部の保持筒部に挿入し、前記開磁路
鉄心の途中に、該鉄心よりも長さが短い１次コイルと２
次コイルを、１次コイルを内側、２次コイルを外側にし
て同心状に設け、樹脂ケース内に途中まで注型した熱硬
化性絶縁樹脂層中に１次コイルと２次コイル、及び開磁
路鉄心の後端部を除いて埋設し、上記熱硬化性絶縁樹脂
層と樹脂ケースの後端との間に耐クラック性絶縁樹脂層
を設け、この耐クラック性樹脂層中に開磁路鉄心の後端
部を埋設したことを特徴とする内燃機関の点火コイル。An open magnetic circuit core is disposed at the center of an elongated cylindrical resin case having a high voltage terminal and a rearwardly-holding cylindrical member at a closed front end, and the front end of the open magnetic circuit core is connected to the resin case. Into the holding cylinder at the closed front end of the primary magnetic core, and in the middle of the open magnetic circuit core, a primary coil and a secondary coil having a length shorter than the core.
The primary coil is provided concentrically with the primary coil inside and the secondary coil outside, and the primary coil and secondary coil are opened in a thermosetting insulating resin layer that has been injected halfway into the resin case, and the magnetic flux is opened. A crack-resistant insulating resin layer is provided between the thermosetting insulating resin layer and the rear end of the resin case, excluding the rear end of the road core, and an open magnetic core is provided in the crack-resistant resin layer. An ignition coil for an internal combustion engine, wherein a rear end of the ignition coil is embedded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7349473A JP2787430B2 (en) | 1995-12-22 | 1995-12-22 | Ignition coil for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7349473A JP2787430B2 (en) | 1995-12-22 | 1995-12-22 | Ignition coil for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09180948A JPH09180948A (en) | 1997-07-11 |
| JP2787430B2 true JP2787430B2 (en) | 1998-08-20 |
Family
ID=18403988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7349473A Expired - Fee Related JP2787430B2 (en) | 1995-12-22 | 1995-12-22 | Ignition coil for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2787430B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208231B1 (en) | 1997-02-14 | 2001-03-27 | Denso Corporation | Stick-type ignition coil having improved structure against crack or dielectric discharge |
| US6977574B1 (en) | 1997-02-14 | 2005-12-20 | Denso Corporation | Stick-type ignition coil having improved structure against crack or dielectric discharge |
| KR20040013863A (en) * | 2002-08-08 | 2004-02-14 | 현대자동차주식회사 | Structure of coil assembly ignition for automobile |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55122326U (en) * | 1979-02-21 | 1980-08-30 | ||
| JPS56169532U (en) * | 1980-05-16 | 1981-12-15 | ||
| JPS60192313A (en) * | 1984-03-14 | 1985-09-30 | Nippon Denso Co Ltd | Core-integrating mold type ignition coil |
| JPS63105317U (en) * | 1986-12-25 | 1988-07-08 | ||
| JPH01283804A (en) * | 1988-05-10 | 1989-11-15 | Murata Mfg Co Ltd | Choke coil |
| JPH07272952A (en) * | 1994-03-31 | 1995-10-20 | Matsushita Electric Ind Co Ltd | Molded transformer |
-
1995
- 1995-12-22 JP JP7349473A patent/JP2787430B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09180948A (en) | 1997-07-11 |
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