JPH06163288A - Ignition transformer - Google Patents
Ignition transformerInfo
- Publication number
- JPH06163288A JPH06163288A JP43A JP31478492A JPH06163288A JP H06163288 A JPH06163288 A JP H06163288A JP 43 A JP43 A JP 43A JP 31478492 A JP31478492 A JP 31478492A JP H06163288 A JPH06163288 A JP H06163288A
- Authority
- JP
- Japan
- Prior art keywords
- shield member
- insulating resin
- case
- insulator
- winding
- 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.)
- Withdrawn
Links
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はイグニッショントランス
に関し、より詳しくは内燃機関の点火プラグ等に高電圧
を供給するのに適したイグニッショントランスに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition transformer, and more particularly to an ignition transformer suitable for supplying a high voltage to an ignition plug of an internal combustion engine.
【0002】[0002]
【従来の技術】一般に変成比が大きく、高電圧を発生す
るイグニッショントランスにおいては、筒状の絶縁体製
ケース内に、一次巻線,二次巻線及びこれら両巻線を磁
気的に結合させるコアを配置するとともに、前記両巻線
の外周に金属製のシールド部材を配置し、さらに、絶縁
体製ケース内に硬質のエポキシ樹脂等の絶縁樹脂を充填
し、金属製ケース,一次巻線,二次巻線等の間の絶縁耐
力を高めている。2. Description of the Related Art Generally, in an ignition transformer having a large transformation ratio and generating a high voltage, a primary winding, a secondary winding, and both windings are magnetically coupled in a cylindrical insulator case. A core is arranged, a metallic shield member is arranged around the both windings, and an insulating case such as a hard epoxy resin is filled in the insulating case to form a metallic case, a primary winding, The dielectric strength between secondary windings etc. is improved.
【0003】しかしながら、このようなイグニッション
トランスにおいては、シールド部材の線膨脹係数が1×
10-5/K程度、エポキシ樹脂の線膨脹係数が4乃至1
0×10-5/K程度と相当の差があるため、温度ストレ
スが加わった場合に、この絶縁樹脂の特に内端面側にク
ラックが発生するという問題があった。However, in such an ignition transformer, the coefficient of linear expansion of the shield member is 1 ×.
About 10 -5 / K, the linear expansion coefficient of epoxy resin is 4 to 1
Since there is a considerable difference of about 0 × 10 −5 / K, there is a problem that cracks occur particularly on the inner end face side of this insulating resin when temperature stress is applied.
【0004】絶縁樹脂にクラックが発生すると、特に3
0KV程度の高圧を発生する二次巻線とシールド部材と
の間の絶縁破壊を招き、イグニッショントランス本来の
機能を維持できなくなってしまう。If the insulating resin is cracked, it is
This causes dielectric breakdown between the secondary winding that generates a high voltage of about 0 KV and the shield member, and the original function of the ignition transformer cannot be maintained.
【0005】[0005]
【発明が解決しようとする課題】上述したように従来に
おいては、シールド部材と絶縁樹脂との線膨脹係数の差
に伴う絶縁破壊対策が考慮されていないという問題があ
った。As described above, there has been a problem in the prior art that no countermeasure against dielectric breakdown due to the difference in linear expansion coefficient between the shield member and the insulating resin is taken into consideration.
【0006】そこで、本発明は、構成を改良し、シール
ド部材と絶縁樹脂との線膨脹係数の差に伴うクラック発
生による絶縁破壊を無くすことができるイグニッション
トランスを提供することを目的とするものである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an ignition transformer which has an improved structure and can eliminate the dielectric breakdown due to the occurrence of cracks due to the difference in linear expansion coefficient between the shield member and the insulating resin. is there.
【0007】[0007]
【課題を解決するための手段】本発明は、筒状の絶縁体
製ケース内に、一次巻線,二次巻線及びこれら両巻線を
磁気的に結合させるコアと、筒状の絶縁体製ケースの内
面に沿って一部が両巻線の長さ方向に沿って欠落した状
態で両巻線の外周を覆う金属製のシールド部材とを配置
するとともに、絶縁体製ケース内に絶縁樹脂を充填し
て、前記二次巻線から高電圧を取り出すイグニッション
トランスにおいて、前記筒状の絶縁製ケースの内端面に
前記シールド部材の端面を係合する袋状部を設けたもの
である。SUMMARY OF THE INVENTION According to the present invention, a primary winding, a secondary winding, a core for magnetically coupling these windings, and a tubular insulator are provided in a tubular insulator case. A metal shield member that covers the outer circumference of both windings is arranged in a state where a part of it is missing along the length direction of both windings along the inner surface of the case. In the ignition transformer that is filled with the above and takes out a high voltage from the secondary winding, a bag-like portion that engages with the end surface of the shield member is provided on the inner end surface of the cylindrical insulating case.
【0008】[0008]
【作用】上記構成のイグニッショントランスによれば、
充填される絶縁樹脂とシールド部材との間に絶縁体ケー
スの一部が介在することになるので線膨脹係数の差によ
る両者の伸縮量の相違を緩衝することができ、この結
果、絶縁樹脂のクラック発生を防止しこのイグニッショ
ントランスの機能を長期間に渡って維持できる。According to the ignition transformer having the above structure,
Since a part of the insulator case is interposed between the filled insulating resin and the shield member, it is possible to buffer the difference in expansion and contraction amount between the two due to the difference in linear expansion coefficient. This prevents the occurrence of cracks and maintains the function of this ignition transformer for a long period of time.
【0009】また、シールド部材は、両巻線の長さ方向
に沿って一部が欠落しているので、渦電流を抑え電力損
失を軽減できる。Further, since the shield member is partially missing along the length direction of both windings, it is possible to suppress eddy current and reduce power loss.
【0010】[0010]
【実施例】以下に本発明の実施例を説明する。EXAMPLES Examples of the present invention will be described below.
【0011】図1に示すイグニッショントランス1は、
図示しない点火プラグに高電圧を供給する構成としたも
のであり、略角筒状で、一方の端部に点火プラグ用の接
続コード装着部2aを備え、また、他方の端部が開口し
た絶縁体製ケース2と、この絶縁体製ケース2の中心部
に配置したコアケース3aに収納された棒状のコア3
と、このコア3の外周に配置したボビン4aに巻回され
た二次巻線4と、二次巻線4の外周に配置したボビン5
aに巻回された一次巻線5と、この一次巻線5の外側
で、かつ、絶縁体製ケース2の内壁2bに密接して配置
した前記絶縁体製ケース2内に装着可能な金属製で板状
のシールド部材6と、前記二次巻線4に一片7aが接続
され、この一片7aと直角配置の他片7bを前記接続コ
ード装着部2aに臨ませた二次接続導体7と、金属製ケ
ース2内に充填されコア3,二次巻線4,一次巻線5,
シールド部材6,絶縁体製ケース2の各々を絶縁するエ
ポキシ樹脂からなる絶縁樹脂8とを有している。The ignition transformer 1 shown in FIG.
It is configured such that a high voltage is supplied to an ignition plug (not shown), and it has a substantially rectangular tube shape and is provided with a connection cord attachment portion 2a for an ignition plug at one end and an opening at the other end. Body case 2 and a rod-shaped core 3 housed in a core case 3a arranged at the center of the insulator case 2.
A secondary winding 4 wound around a bobbin 4a arranged on the outer periphery of the core 3, and a bobbin 5 arranged on the outer periphery of the secondary winding 4.
a primary winding 5 wound around a and a metal that can be mounted outside the primary winding 5 and inside the insulator case 2 that is placed in close contact with the inner wall 2b of the insulator case 2. And a plate-shaped shield member 6, a piece 7a connected to the secondary winding 4, and a piece 7a of the secondary connecting conductor 7 having another piece 7b arranged at a right angle facing the piece of connecting cord 2a. The core 3, the secondary winding 4, the primary winding 5, which is filled in the metal case 2,
The insulating member 8 is made of an epoxy resin that insulates each of the shield member 6 and the insulator case 2.
【0012】尚、図1中、9は二次巻線4を巻装すると
ともに二次接続導体7を取り付ける略円筒状の二次ボビ
ン、10は一次巻線5を巻装する略円筒状の一次ボビン
である。In FIG. 1, reference numeral 9 denotes a substantially cylindrical secondary bobbin for winding the secondary winding 4 and mounting the secondary connecting conductor 7, and 10 denotes a substantially cylindrical shape for winding the primary winding 5. It is a primary bobbin.
【0013】前記絶縁体製ケース2の内壁2bの一部に
は、図2,図3に示すように、二次巻線4,一次巻線5
の長さ方向に沿って中央部が内壁2bに連結されるとと
もに、上下方向に一定の幅を持ち内壁2bから微小距離
離隔したガイド板11が配置され、このガイド板11
と、内壁2bとにより二次巻線4,一次巻線5の長さ方
向に沿った上下一対のガイド溝12a,12bを形成し
ている。As shown in FIGS. 2 and 3, a secondary winding 4 and a primary winding 5 are formed on a part of the inner wall 2b of the insulator case 2.
The central portion is connected to the inner wall 2b along the length direction of the guide plate 11, and a guide plate 11 having a certain width in the vertical direction and spaced a minute distance from the inner wall 2b is arranged.
And the inner wall 2b form a pair of upper and lower guide grooves 12a and 12b along the length direction of the secondary winding 4 and the primary winding 5.
【0014】また、前記絶縁体製ケース2内のガイド溝
12a,12bの最深部には、図2及び図3に示すよう
に、内壁2bの内周方向に沿って突壁2cが設けられて
いる。これによってシールド部材端部挿入用の袋状部1
4を形成している。Further, as shown in FIGS. 2 and 3, a projecting wall 2c is provided along the inner peripheral direction of the inner wall 2b at the deepest portion of the guide grooves 12a, 12b in the insulator case 2. There is. As a result, the bag-shaped portion 1 for inserting the end portion of the shield member
4 is forming.
【0015】前記シールド部材6は、図3にも示すよう
に、前記絶縁体製ケース2の内壁2bに沿って挿入可能
な筒状に形成され、かつ、その上辺の中央部に前記ガイ
ド溝12a,12bに挿入できるように長さ方向に沿っ
て切除した切除部6aを設けている。このシールド部材
6の先端縁6bが前記ケース2の内端面に設けられた袋
状部14に挿入されるようになる。As shown in FIG. 3, the shield member 6 is formed in a cylindrical shape that can be inserted along the inner wall 2b of the insulator case 2, and the guide groove 12a is formed in the center of the upper side thereof. , 12b are provided with cut-off portions 6a cut along the length direction. The tip edge 6b of the shield member 6 is inserted into the bag-shaped portion 14 provided on the inner end surface of the case 2.
【0016】また、前記一次ボビン10の端部側には、
この一次ボビン10を絶縁体製ケース2内に装着したと
きシールド部材6の端部に係合する段差部10aを設け
ている。On the end side of the primary bobbin 10,
A step portion 10a is provided which engages with the end portion of the shield member 6 when the primary bobbin 10 is mounted in the insulator case 2.
【0017】尚、ケース体2を形成する絶縁樹脂は比較
的軟かい材料のもの(例えば線膨脹係数が2〜3×-5/
k程度のもの)が用いられるが、充填樹脂は耐圧を確保
するために硬い材料のもの(例えば線膨脹係数が1×1
0-5/k程度のもの)が選ばれることは言う迄もない。The insulating resin forming the case body 2 is made of a relatively soft material (for example, the linear expansion coefficient is 2 to 3 × -5 /
However, the filling resin is made of a hard material (for example, the linear expansion coefficient is 1 × 1) in order to secure the pressure resistance.
Needless to say, the one selected is about 0 −5 / k).
【0018】次に、上述したイグニッショクトランス1
の作用を説明する。Next, the above-mentioned ignition transformer 1
The action of will be explained.
【0019】このイグニッショントランス1によれば、
一次巻線5又は二次巻線4の外周領域の硬質の絶縁樹脂
8とシールド部材6との間に軟質絶縁樹脂からなるケー
ス体2の突壁2cを介在させたので、絶縁樹脂8とシー
ルド部材6との既述したような線膨脹係数の差による両
者の伸縮量の相違を緩衝することができ、この結果、絶
縁樹脂8のクラック発生を防止しこのイグニッショント
ランス1の機能を長期間に渡って維持できる。According to this ignition transformer 1,
Since the projecting wall 2c of the case body 2 made of soft insulating resin is interposed between the shield member 6 and the hard insulating resin 8 in the outer peripheral region of the primary winding 5 or the secondary winding 4, the insulating resin 8 and the shield are provided. It is possible to buffer the difference in the amount of expansion and contraction between the member 6 and the member 6 due to the difference in the linear expansion coefficient as described above, and as a result, the occurrence of cracks in the insulating resin 8 can be prevented and the function of the ignition transformer 1 can be maintained for a long time. Can be maintained across.
【0020】また、シールド部材6は、両巻線4,5の
長さ方向に沿って切除部6aを有するので、一次巻線
5,二次巻線4の磁気結合に伴う渦電流を抑え電力損失
を軽減できる。Further, since the shield member 6 has the cutout portion 6a along the lengthwise direction of both the windings 4 and 5, the eddy current due to the magnetic coupling between the primary winding 5 and the secondary winding 4 is suppressed and the power is reduced. You can reduce the loss.
【0021】さらに、このイグニッショントランス1の
組み立て性を考慮すると、組み立て時において、シール
ド部材6の欠除部6aを、図3に示すように、絶縁体製
ケース2のガイド溝12a,12bに合せつつこのシー
ルド部材6を絶縁体製ケース2内に挿入し、さらに、シ
ールド部材6の挿入先端部を前記袋状部14内にまで挿
入することで、このシールド部材6を所定の位置に位置
決めできる。次に、前記一次ボビン10を絶縁体製ケー
ス2内に挿入し、この一次ボビン10の段差部10aを
シールド部材6の端部に係合することで、一次ボビン1
0、従って一次巻線4の位置決めも容易に実行できる。Further, considering the assemblability of the ignition transformer 1, the notch 6a of the shield member 6 is aligned with the guide grooves 12a, 12b of the insulator case 2 at the time of assembly, as shown in FIG. Meanwhile, the shield member 6 can be positioned at a predetermined position by inserting the shield member 6 into the insulator case 2 and further inserting the insertion tip of the shield member 6 into the bag-shaped portion 14. . Next, the primary bobbin 1 is inserted by inserting the primary bobbin 10 into the insulator case 2 and engaging the step portion 10a of the primary bobbin 10 with the end portion of the shield member 6.
0, and therefore the positioning of the primary winding 4 can also be easily performed.
【0022】本発明は上述した実施例のほかその要旨の
範囲内で種々の変形が可能である。例えば、上述した実
施例では、絶縁体製ケース,シールド部材を角筒状とし
たが、これらを円筒状としても実施可能である。The present invention can be modified in various ways within the scope of the invention in addition to the above-mentioned embodiment. For example, in the above-described embodiment, the insulator case and the shield member have a rectangular tube shape, but they may have a cylindrical shape.
【0023】[0023]
【発明の効果】以上詳述した本発明によれば、上述した
構成としたので、絶縁樹脂とシールド部材との伸縮量の
相違を緩衝することができ、絶縁樹脂のクラック発生を
防止し長期間に渡って本来の機能を維持できるイグニッ
ショントランスを提供することができる。According to the present invention described in detail above, since it is configured as described above, it is possible to buffer the difference in expansion and contraction amount between the insulating resin and the shield member, prevent cracking of the insulating resin, and prevent long-term occurrence. It is possible to provide an ignition transformer capable of maintaining the original function over the entire range.
【図1】本発明のイグニッショントランスの実施例を示
す断面図FIG. 1 is a sectional view showing an embodiment of an ignition transformer of the present invention.
【図2】本実施例のイグニッショントランスの絶縁体製
ケースの断面図FIG. 2 is a sectional view of an insulator case of the ignition transformer of the present embodiment.
【図3】本実施例のイグニッショントランスの絶縁体製
ケース、シールド部材の分解斜視図FIG. 3 is an exploded perspective view of an insulator case and a shield member of the ignition transformer of this embodiment.
1 イグニッショントランス 2 絶縁体製ケース 3 コア 4 二次巻線 5 一次巻線 6 シールド部材 8 絶縁樹脂 14 袋状部 1 Ignition transformer 2 Insulator case 3 Core 4 Secondary winding 5 Primary winding 6 Shield member 8 Insulating resin 14 Bag-shaped part
Claims (1)
二次巻線及びこれら両巻線を磁気的に結合させるコア
と、筒状の絶縁体製ケースの内面に沿って一部が両巻線
の長さ方向に沿って欠落した状態で両巻線の外周を覆う
金属製のシールド部材とを配置するとともに、絶縁体製
ケース内に絶縁樹脂を充填して、前記二次巻線から高電
圧を取り出すイグニッショントランスにおいて、前記筒
状の絶縁体製ケースの内端面に前記シールド部材の端面
を係合する袋状部を設けたことを特徴とするイグニッシ
ョントランス。1. A primary winding in a tubular case made of an insulator,
The secondary winding and the core that magnetically couples these windings, and both windings in a state in which a portion along the inner surface of the cylindrical insulator case is missing along the length direction of both windings In the ignition transformer for arranging a metal shield member that covers the outer periphery of the insulating case and filling the inside of the insulating case with an insulating resin to extract a high voltage from the secondary winding, the cylindrical insulating case is used. An ignition transformer, wherein a bag-shaped portion that engages an end surface of the shield member is provided on an inner end surface of the ignition transformer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP43A JPH06163288A (en) | 1992-11-25 | 1992-11-25 | Ignition transformer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP43A JPH06163288A (en) | 1992-11-25 | 1992-11-25 | Ignition transformer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06163288A true JPH06163288A (en) | 1994-06-10 |
Family
ID=18057556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP43A Withdrawn JPH06163288A (en) | 1992-11-25 | 1992-11-25 | Ignition transformer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06163288A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003017342A (en) * | 2001-06-29 | 2003-01-17 | Diamond Electric Mfg Co Ltd | Ignition coil for internal combustion engine |
-
1992
- 1992-11-25 JP JP43A patent/JPH06163288A/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003017342A (en) * | 2001-06-29 | 2003-01-17 | Diamond Electric Mfg Co Ltd | Ignition coil for internal combustion engine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000201 |