JPH11186079A - Ignition coil - Google Patents
Ignition coilInfo
- Publication number
- JPH11186079A JPH11186079A JP9356426A JP35642697A JPH11186079A JP H11186079 A JPH11186079 A JP H11186079A JP 9356426 A JP9356426 A JP 9356426A JP 35642697 A JP35642697 A JP 35642697A JP H11186079 A JPH11186079 A JP H11186079A
- Authority
- JP
- Japan
- Prior art keywords
- case
- closing plate
- thermosetting resin
- connector housing
- ignition coil
- 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
- 239000011347 resin Substances 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims abstract description 26
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 20
- 230000000903 blocking effect Effects 0.000 claims abstract 6
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 5
- 239000004593 Epoxy Substances 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 description 7
- 239000004734 Polyphenylene sulfide Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- -1 polybutylene terephthalate Polymers 0.000 description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、樹脂製のコネクタ
ハウジングを樹脂製のケースの開口部に組み付けた点火
コイルに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil in which a resin connector housing is assembled to an opening of a resin case.
【０００２】[0002]
【従来の技術】近年、点火方式の主流となりつつある気
筒別点火方式（Ｓ−ＤＬＩ点火方式）の点火コイルは、
例えば、図５に示すように、ケース１１の下方に形成し
たタワー部１２をエンジンの各気筒のプラグホール（図
示せず）に挿入して、点火プラグに直結するようになっ
ている。このものでは、車種毎の取付仕様に応じてコネ
クタハウジング１３の向きを変更できるように、コネク
タハウジング１３をケース１１とは別体に形成し、この
コネクタハウジング１３を、ケース１１に形成された開
口部１４に組み付けると共に、ケース１１内に熱硬化性
樹脂１５を充填して、その内部の一次巻線、二次巻線、
イグナイタ等を封止するようにしたものがある。コネク
タハウジング１３の組付方法は、コネクタハウジング１
３の基端部に閉塞板部１６を一体成形し、この閉塞板部
１６の外周部に形成した圧入溝１７を、ケース１１の開
口部１４の内縁部に圧入して固定するものである。2. Description of the Related Art In recent years, an ignition coil of a cylinder-by-cylinder ignition system (S-DLI ignition system), which is becoming the mainstream of an ignition system,
For example, as shown in FIG. 5, a tower portion 12 formed below a case 11 is inserted into a plug hole (not shown) of each cylinder of the engine so as to be directly connected to a spark plug. In this embodiment, the connector housing 13 is formed separately from the case 11 so that the direction of the connector housing 13 can be changed according to the mounting specification of each vehicle type. At the same time, the case 11 is filled with the thermosetting resin 15, and the primary winding, the secondary winding,
There is a type in which an igniter or the like is sealed. The method of assembling the connector housing 13 is as follows.
The closing plate 16 is formed integrally with the base end of the casing 3, and the press-fitting groove 17 formed on the outer periphery of the closing plate 16 is pressed into the inner edge of the opening 14 of the case 11 and fixed.
【０００３】[0003]
【発明が解決しようとする課題】ところで、ケース１１
内に充填した熱硬化性樹脂１５は、硬化時に収縮変形す
るため、熱硬化性樹脂１５とケース１１や閉塞板部１６
との間に残留応力が発生する。この残留応力は、ケース
１１や閉塞板部１６の剛性が高いと、大きくなり、この
残留応力が大きくなるほど、点火コイルの昇温／降温の
繰り返しによる熱硬化性樹脂１５の疲労・劣化が早ま
り、熱硬化性樹脂１５の内部にクラックが発生しやすく
なったり、ケース１１や閉塞板部１６の内面で熱硬化性
樹脂１５が剥離しやすくなる。このような熱硬化性樹脂
１５のクラックや剥離は、高圧部分の絶縁性を低下さ
せ、絶縁不良を招く原因となる。The case 11
Since the thermosetting resin 15 filled therein is shrunk and deformed during curing, the thermosetting resin 15 and the case 11 and the closing plate 16
, A residual stress is generated. This residual stress increases when the rigidity of the case 11 and the closing plate portion 16 is high. As the residual stress increases, fatigue / deterioration of the thermosetting resin 15 due to repetition of heating / cooling of the ignition coil is accelerated, Cracks are easily generated inside the thermosetting resin 15, and the thermosetting resin 15 is easily peeled off on the inner surfaces of the case 11 and the closing plate 16. Such cracking or peeling of the thermosetting resin 15 lowers the insulating property of the high-voltage portion and causes insulation failure.
【０００４】本発明はこのような事情を考慮してなされ
たものであり、従ってその目的は、ケース内に充填した
熱硬化性樹脂のクラックや剥離による絶縁性低下を長期
間にわたって防止でき、耐久性・信頼性の高い点火コイ
ルを提供することにある。[0004] The present invention has been made in view of such circumstances, and accordingly, it is an object of the present invention to prevent a thermosetting resin filled in a case from cracking or peeling, and to prevent insulation deterioration over a long period of time. An object of the present invention is to provide a highly reliable and reliable ignition coil.
【０００５】[0005]
【課題を解決するための手段】一般に、ケース内に充填
した熱硬化性樹脂の硬化時の収縮変形による残留応力
は、ケースの剛性を低下させて変形容易とすることで、
低減できるという点に着目し、本発明では、ケースの開
口部に組み付けるコネクタハウジングのうちケースの開
口部を塞ぐ部分（以下「閉塞板部」という）を薄肉に形
成したものである（請求項１）。従来は、図５に示すよ
うに、閉塞板部１６の肉厚が厚く、その結果、ケース１
１が閉塞板部１６で補強されてしまうため、ケース１１
の剛性が高くなり、残留応力が大きくなってしまうのに
対し、本発明では、閉塞板部を薄肉に形成することで、
閉塞板部の強度を低下させて、閉塞板部によるケースの
補強効果を低下させることができ、それによって、ケー
スの剛性を低下させてケースを変形容易とすることがで
きる。これにより、熱硬化性樹脂の硬化時の収縮変形に
よる残留応力を低減することができて、熱硬化性樹脂の
クラックや剥離による絶縁性低下を長期間にわたって防
止でき、点火コイルの耐久性・信頼性を高めることがで
きる。Generally, residual stress due to shrinkage deformation of a thermosetting resin filled in a case during curing is reduced by reducing the rigidity of the case to facilitate deformation.
Focusing on the fact that the opening can be reduced, in the present invention, a portion (hereinafter referred to as a “closing plate”) of the connector housing that is assembled into the opening of the case and that closes the opening of the case is formed to be thin. ). Conventionally, as shown in FIG. 5, the thickness of the closing plate portion 16 is large, and as a result, the case 1
1 is reinforced by the closing plate portion 16, so that the case 11
In contrast to the fact that the rigidity becomes high and the residual stress increases, in the present invention, by forming the closing plate portion thin,
By reducing the strength of the closing plate portion, the effect of reinforcing the case by the closing plate portion can be reduced, whereby the rigidity of the case can be reduced and the case can be easily deformed. As a result, residual stress due to shrinkage deformation of the thermosetting resin during curing can be reduced, and insulation deterioration due to cracking or peeling of the thermosetting resin can be prevented for a long period of time. Can be enhanced.
【０００６】この場合、コネクタハウジングの閉塞板部
の内面側を凹状に形成することで、薄肉に形成しても良
い（請求項２）。このようにすれば、閉塞板部の外面全
体を平坦面とすることが可能となり、外観意匠性を向上
できると共に、閉塞板部の外面に水分や塵埃が溜ること
を防止できる。In this case, the closing surface of the closing plate portion of the connector housing may be formed in a concave shape so as to be thin. This makes it possible to make the entire outer surface of the closing plate portion a flat surface, improve the appearance design, and prevent moisture and dust from collecting on the outer surface of the closing plate portion.
【０００７】また、コネクタハウジングの閉塞板部を中
空状に形成することで薄肉に形成すると共に、該閉塞板
部の外周部に形成した圧入溝を、ケースの開口部の内縁
部に圧入して固定するようにしても良い（請求項３）。
このようにすれば、上述した請求項２と同じ効果を得る
ことができる上に、閉塞板部の外周部の圧入溝を、ケー
スの開口部の内縁部に圧入する際に、圧入治具で閉塞板
部の上端面を均等に加圧しやすくなり、閉塞板部の圧入
が容易になると共に、圧入時の閉塞板部の破損を防止で
きる。Further, the closing plate portion of the connector housing is formed in a hollow shape so as to be thin, and the press-fitting groove formed in the outer peripheral portion of the closing plate portion is pressed into the inner edge portion of the opening of the case. It may be fixed (claim 3).
With this configuration, the same effect as in the above-described claim 2 can be obtained, and in addition, when the press-fitting groove on the outer peripheral portion of the closing plate portion is press-fitted into the inner edge of the opening of the case, the press-fitting jig is used. The upper end face of the closing plate can be easily pressed evenly, and the press-fitting of the closing plate can be facilitated, and damage to the closing plate at the time of press-fitting can be prevented.
【０００８】[0008]
【発明の実施の形態】以下、本発明を矩形型の点火コイ
ルに適用した実施形態（１）を図１に基づいて説明す
る。点火コイルのケース２１は、例えばポリブチレンテ
レフタレート（ＰＢＴ）、ポリフェニレンサルファイド
（ＰＰＳ）、ポリエチレンテレフタレート（ＰＥＴ）等
の絶縁性樹脂を用いて矩形状に成形され、その内部に
は、一次巻線、二次巻線、イグナイタ（いずれも図示せ
ず）等が収納されている。このケース２１の下方にはタ
ワー部２２が一体に形成され、このタワー部２２をエン
ジンの各気筒のプラグホール（図示せず）に挿入して、
点火プラグに直結するようになっている。また、ケース
２１の側面部には、取付部２３が一体に形成され、この
取付部２３のボルト挿通孔２４に上方からボルト（図示
せず）を挿通してエンジンのヘッドカバー（図示せず）
に締付固定するようになっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (1) in which the present invention is applied to a rectangular ignition coil will be described below with reference to FIG. The ignition coil case 21 is formed in a rectangular shape using an insulating resin such as polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), or polyethylene terephthalate (PET). A secondary winding, an igniter (both not shown) and the like are housed. A tower portion 22 is integrally formed below the case 21. The tower portion 22 is inserted into a plug hole (not shown) of each cylinder of the engine,
It is directly connected to the spark plug. A mounting portion 23 is integrally formed on a side surface portion of the case 21, and a bolt (not shown) is inserted from above into a bolt insertion hole 24 of the mounting portion 23, and an engine head cover (not shown) is inserted.
To be fixed.
【０００９】ケース２１の一側面には、コネクタハウジ
ング２５を組み付けるための開口部２６が形成されてい
る。コネクタハウジング２５も、例えばポリブチレンテ
レフタレート（ＰＢＴ）、ポリフェニレンサルファイド
（ＰＰＳ）、ポリエチレンテレフタレート（ＰＥＴ）等
の絶縁性樹脂を用いて成形され、コネクタピン２７がイ
ンサート成形されている。このコネクタハウジング２５
の基端部には、閉塞板部２８が一体成形され、この閉塞
板部２８の外周部に形成された圧入溝２９がケース２１
の開口部２６の内縁部に圧入されている。この場合、閉
塞板部２８は、内面側を凹状に形成することで薄肉に形
成されている。閉塞板部２８の薄肉部分の肉厚は、ケー
ス２１の肉厚と略同一又はそれよりも薄肉に形成されて
いる。コネクタハウジング２５が組み付けられたケース
２１の内部には、エポキシ系の熱硬化性樹脂３０が充填
されている。An opening 26 for mounting the connector housing 25 is formed on one side of the case 21. The connector housing 25 is also molded using an insulating resin such as polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), or polyethylene terephthalate (PET), and the connector pins 27 are insert-molded. This connector housing 25
A closing plate portion 28 is integrally formed at a base end of the case 21, and a press-fit groove 29 formed on an outer peripheral portion of the closing plate portion 28 is formed in the case 21.
Is press-fitted into the inner edge of the opening 26. In this case, the closing plate portion 28 is formed to be thin by forming the inner surface side in a concave shape. The thickness of the thin portion of the closing plate portion 28 is substantially the same as or thinner than the thickness of the case 21. The inside of the case 21 in which the connector housing 25 is assembled is filled with an epoxy-based thermosetting resin 30.
【００１０】以上のように構成した点火コイルによれ
ば、コネクタハウジング２５の閉塞板部２８を薄肉に形
成したので、閉塞板部２８の強度を低下させることがで
きて、閉塞板部２８によるケース２１の補強効果を低下
させることができ、それによって、ケース２１の剛性を
低下させてケース２１を変形容易とすることができる。
これにより、熱硬化性樹脂３０の硬化時の収縮変形によ
る残留応力を低減することができて、熱硬化性樹脂３０
のクラックや剥離による絶縁性低下を長期間にわたって
防止でき、点火コイルの耐久性・信頼性を高めることが
できる。According to the ignition coil configured as described above, since the closing plate portion 28 of the connector housing 25 is formed to be thin, the strength of the closing plate portion 28 can be reduced. The reinforcing effect of the case 21 can be reduced, whereby the rigidity of the case 21 can be reduced and the case 21 can be easily deformed.
As a result, residual stress due to shrinkage deformation of the thermosetting resin 30 during curing can be reduced, and the thermosetting resin 30
Can be prevented for a long period of time due to cracking or peeling of the ignition coil, and the durability and reliability of the ignition coil can be improved.
【００１１】しかも、本実施形態（１）では、コネクタ
ハウジング２５の閉塞板部２８の内面側を凹状に形成す
ることで薄肉に形成したので、閉塞板部２８の外面全体
を平坦面とすることが可能となり、外観意匠性を向上で
きると共に、閉塞板部２８の外面に水分や塵埃が溜るこ
とを防止できる。Moreover, in the first embodiment, since the inner surface side of the closing plate portion 28 of the connector housing 25 is formed to be thin by forming a concave shape, the entire outer surface of the closing plate portion 28 is made flat. This makes it possible to improve the design of the external appearance and to prevent moisture and dust from accumulating on the outer surface of the closing plate portion 28.
【００１２】しかしながら、図２に示す本発明の実施形
態（２）のように、コネクタハウジング２５の閉塞板部
３１の外面側を凹状に形成することで薄肉に形成した
り、或は、図２に示す本発明の実施形態（３）のよう
に、コネクタハウジング２５の閉塞板部３２の内外両面
を凹状に形成することで薄肉に形成しても良い。これら
いずれの実施形態でも、閉塞板部２８の強度を低下させ
てケース２１の剛性を低下させることができるため、本
発明の所期の目的を十分に達成できる。However, as in the embodiment (2) of the present invention shown in FIG. 2, the outer surface side of the closing plate portion 31 of the connector housing 25 is formed in a concave shape so as to be thin, or as shown in FIG. As shown in the embodiment (3) of the present invention, the inner and outer surfaces of the closing plate portion 32 of the connector housing 25 may be formed to be thin by forming concave surfaces. In any of these embodiments, the strength of the closing plate portion 28 can be reduced and the rigidity of the case 21 can be reduced, so that the intended object of the present invention can be sufficiently achieved.
【００１３】また、図４に示す本発明の実施形態（４）
のように、コネクタハウジング２５の閉塞板部３３に、
面方向に延びる中空部３４を形成することで、閉塞板部
３３を薄肉に形成するようにしても良い。このようにす
れば、閉塞板部３３の強度を低下させながら外面全体を
平坦面とすることができるため、前記実施形態（１）と
同じ効果を得ることができる。更に、閉塞板部３３の外
周部の圧入溝２８を、ケース２１の開口部２６の内縁部
に圧入する際に、圧入治具で閉塞板部３３の上端面を均
等に加圧しやすくなり、閉塞板部３３の圧入が容易にな
ると共に、圧入時の閉塞板部３３の破損を防止できる。An embodiment (4) of the present invention shown in FIG.
In the closing plate 33 of the connector housing 25,
By forming the hollow portion 34 extending in the plane direction, the closing plate portion 33 may be formed to be thin. By doing so, the entire outer surface can be made a flat surface while reducing the strength of the closing plate portion 33, so that the same effect as in the embodiment (1) can be obtained. Further, when the press-fitting groove 28 on the outer peripheral portion of the closing plate portion 33 is pressed into the inner edge portion of the opening 26 of the case 21, the upper end surface of the closing plate portion 33 is easily pressed evenly by the press-fitting jig, and The press-fitting of the plate portion 33 is facilitated, and the breakage of the closing plate portion 33 at the time of press-fitting can be prevented.
【００１４】上記各実施形態（１）〜（４）は、いずれ
も矩形型のケース２１内に一次巻線、二次巻線等を収納
し、このケース２１の下部のタワー部２２をプラグホー
ルに挿入して点火プラグに直結する矩形型の点火コイル
に本発明を適用したものであるが、プラグホール内に挿
入される円筒状のコイルケース内に一次巻線、二次巻線
等を同心状に収納したステッイク型の点火コイルにも本
発明を適用可能である。ステッイク型の点火コイルの場
合には、コイルケースの上部に設ける頭部ケースに開口
部を形成して、コネクタハウジングを組み付けるように
すれば良い。In each of the above embodiments (1) to (4), a primary winding, a secondary winding, and the like are housed in a rectangular case 21 and a tower portion 22 below the case 21 is plugged. The present invention is applied to a rectangular ignition coil that is inserted into a plug hole and directly connected to an ignition plug. However, a primary winding, a secondary winding, and the like are concentrically arranged in a cylindrical coil case inserted into a plug hole. The present invention is also applicable to a stake type ignition coil housed in a shape. In the case of a stake-type ignition coil, an opening may be formed in a head case provided above the coil case, and the connector housing may be assembled.
【図１】本発明の実施形態（１）の点火コイルを示す斜
視図FIG. 1 is a perspective view showing an ignition coil according to an embodiment (1) of the present invention.
【図２】本発明の実施形態（２）の点火コイルを示す斜
視図FIG. 2 is a perspective view showing an ignition coil according to an embodiment (2) of the present invention.
【図３】本発明の実施形態（３）の点火コイルを示す斜
視図FIG. 3 is a perspective view showing an ignition coil according to an embodiment (3) of the present invention.
【図４】本発明の実施形態（４）の点火コイルを示す斜
視図FIG. 4 is a perspective view showing an ignition coil according to an embodiment (4) of the present invention.
【図５】従来の点火コイルを示す斜視図FIG. 5 is a perspective view showing a conventional ignition coil.
２１…ケース、２２…タワー部、２３…取付部、２５…
コネクタハウジング、２６…開口部、２８…閉塞板部、
２９…圧入溝、３０…熱硬化性樹脂、３１〜３３…閉塞
板部、３４…中空部。21 ... Case, 22 ... Tower part, 23 ... Mounting part, 25 ...
Connector housing, 26 ... opening, 28 ... closing plate,
29: press-fit groove, 30: thermosetting resin, 31 to 33: closing plate portion, 34: hollow portion.
Claims (3)
ケースの開口部に組み付け、前記ケース内に熱硬化性樹
脂を充填してなる点火コイルにおいて、 前記コネクタハウジングのうち前記開口部を塞ぐ部分
（以下「閉塞板部」という）を薄肉に形成したことを特
徴とする点火コイル。1. An ignition coil in which a resin-made connector housing is assembled to an opening of a resin-made case, and the case is filled with a thermosetting resin. (Hereinafter, referred to as a "blocking plate portion").
ことで薄肉に形成したことを特徴とする請求項１に記載
の点火コイル。2. The ignition coil according to claim 1, wherein an inner surface of the closing plate portion is formed in a concave shape so as to be thin.
薄肉に形成すると共に、該閉塞板部の外周部に形成した
圧入溝を、前記開口部の内縁部に圧入して固定したこと
を特徴とする請求項１に記載の点火コイル。3. The method according to claim 3, wherein the closing plate is formed in a hollow shape so as to be thin, and a press-fitting groove formed in an outer peripheral portion of the closing plate is press-fitted into an inner edge of the opening to be fixed. The ignition coil according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9356426A JPH11186079A (en) | 1997-12-25 | 1997-12-25 | Ignition coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9356426A JPH11186079A (en) | 1997-12-25 | 1997-12-25 | Ignition coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11186079A true JPH11186079A (en) | 1999-07-09 |
Family
ID=18448959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9356426A Pending JPH11186079A (en) | 1997-12-25 | 1997-12-25 | Ignition coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11186079A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008198870A (en) * | 2007-02-14 | 2008-08-28 | Toyota Motor Corp | Electronic component housing |
| JP2016012599A (en) * | 2014-06-27 | 2016-01-21 | 株式会社デンソー | Ignition coil for internal combustion engine |
-
1997
- 1997-12-25 JP JP9356426A patent/JPH11186079A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008198870A (en) * | 2007-02-14 | 2008-08-28 | Toyota Motor Corp | Electronic component housing |
| JP2016012599A (en) * | 2014-06-27 | 2016-01-21 | 株式会社デンソー | Ignition coil for internal combustion engine |
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