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JP3784367B2 - Iron core-coil assembly of ignition coil for internal combustion engine - Google Patents

Iron core-coil assembly of ignition coil for internal combustion engine Download PDF

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Publication number
JP3784367B2
JP3784367B2 JP2002376480A JP2002376480A JP3784367B2 JP 3784367 B2 JP3784367 B2 JP 3784367B2 JP 2002376480 A JP2002376480 A JP 2002376480A JP 2002376480 A JP2002376480 A JP 2002376480A JP 3784367 B2 JP3784367 B2 JP 3784367B2
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JP
Japan
Prior art keywords
core
permanent magnet
coil
core portion
bobbin
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
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JP2002376480A
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Japanese (ja)
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JP2004207581A (en
Inventor
雅晶 堀
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阪神エレクトリック株式会社
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Priority to JP2002376480A priority Critical patent/JP3784367B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、自動車のエンジンなどの内燃機関の点火プラグに高電圧を供給して火花放電を生じさせるための内燃機関用点火コイルの鉄心−コイル組立体に関する。
【0002】
【従来の技術】
モールド型の内燃機関用点火コイルは、通常、図2に示すように、2次コイル2、2次コイルの内周を貫通する1次コイル1、及び上記1次コイルの内周を貫通する直線鉄心部3′を含む閉磁路鉄心の外環鉄心部3を絶縁ケース4の内部に収容すると共に、上記絶縁ケースには一部が絶縁ケースの内部に突入する高圧端子6を収容した高圧筒5を設け、前記2次コイルのボビンには2次巻線の巻終り側を接続する弾性ピン7を取付け、この弾性ピンを上記高圧端子の絶縁ケース内突入端部6′に弾性的に接触させ、絶縁ケース内に注型して固化させた絶縁樹脂層8により絶縁ケース内に上記2次コイル2、1次コイル1、閉磁路鉄心、弾性ピン7、高圧端子6を固定して構成する。そして、点火コイルの出力を高めるため、閉磁路鉄心の直線鉄心部3′の一端部と、この一端部が対向する外環鉄心部3の内周との間に、図示のように永久磁石の四角い薄片9を介在させることがある。
【0003】
この場合、永久磁石の薄片9の、直線鉄心部3′の一端部に向いた面の磁極、及び外環鉄心部3の内周に向いた反対の面の磁極は、1次コイルに通電したときに作られる磁束とは逆の磁束を発生する向きにして永久磁石の薄片を閉磁路と直列に配置し、閉磁路鉄心に磁気バイアスをかけ、1次コイルへの電流遮断時に閉磁路鉄心の磁束の変化量を大きくし、出力を高めるのである。
【0004】
【発明が解決しようとする課題】
従来の永久磁石の薄片は、直線鉄心部3′の端面と同大な四角形で、直線鉄心部の一端部の端面に磁力で吸着して1次コイルの一端の鍔の外に位置しているため、外環鉄心部3と組合わせて閉磁路鉄心に組立てる際、外環鉄心部の内周に接触してずれ動き、直線鉄心部の一端部の端面から外にはみ出し、正しく作用しないとか、はみ出た部分を押し戻して正しい位置に直すための手数がかかり、生産性を低下させるとかの問題が生じる。更に、永久磁石の薄片9の四角形の大きさは直線鉄心部3′の端面と同大なので、大形になり永久磁石のコストが高くなる。
【0005】
【課題を解決するための手段】
本発明は、上記問題点を解消するために開発されたのであって、両端部に鍔を有し、外周に1次コイルが巻かれたボビンの内周に、積層板を積層した閉磁路鉄心の直線鉄心部を挿通し、直線鉄心部の一端と、1次コイル及び1次コイルが挿通された2次コイルを囲む閉磁路鉄心の外環鉄心部の内周との間に永久磁石の四角い薄片を介在させた内燃機関用点火コイルの鉄心−コイル組立体において、永久磁石の四角い薄片の直角な第1と第2辺とのうちの第1辺の長さを直線鉄心部を構成する積層板の積層厚と直線鉄心部を構成する積層板のとの一方より大にすると共に、第2辺の長さを直線鉄心部を構成する積層板の積層厚と直線鉄心部を構成する積層板の幅との他方よりも小にし、ボビンの一端の鍔の端部の中央に、深さが永久磁石の薄片の厚さと等しく、且つ第1辺の各端部を受入れる切欠きを対向させて設け、第1辺の各端部を切欠きに係合させ、永久磁石の薄片を直線鉄心部の一端に当接させてボビンの一端の鍔に保持させたことを特徴とする。
【0006】
【発明の実施の形態】
図1は本発明の一実施例を示すもので、永久磁石の四角い薄片9の直角な第1辺と第2辺のうちの第1辺、すなわち一辺L1の長さを閉磁路鉄心の直線鉄心部3′の積層厚tよりも大にし(以下、一辺を長辺とも記す)、第2辺、すなわち他辺L2の長さは上記直線鉄心部3′の幅wよりも小にしてある(以下、他辺を短辺とも記す)。
【0007】
そして上記1次コイルのボビン11の一端の鍔11′の端部の中央に、永久磁石の薄片9の厚さと深さが同じで、薄片9の長辺L1の各端部(長辺L1の長さから直線鉄心部の積層厚tを引いた長さの1/2宛)を受入れる切欠き12、12を対向させて設け、この切欠き12、12に永久磁石の薄片の長辺 1 の各端部を係合させる。
【0008】
勿論、1次コイルのボビン11中には直線鉄心部3′が挿入してあり、その一端部と永久磁石の薄片9は磁力で吸着し合い、薄片9の長辺L1の各端部は切欠き12、12に係合しているため動くことなく保持される。
【0009】
そして、外環鉄心部3と、内周に直線鉄心部3′を有する1次コイルとを、組立てて閉磁路鉄心を組立てる際も、永久磁石の薄片は外環鉄心部の内周と擦れても動かず、その内周に密着する。尚、永久磁石の薄片の直線鉄心部3′に向いた側の磁極と、外環鉄心部の内周に向いた側の磁極は、前述の段落0003に述べた通りにし、1次コイルへの電流遮断時に閉磁路鉄心の磁束の変化量を大にし、点火コイルの出力を高めるようにする。
【0010】
図示の実施例では永久磁石の薄片9の直角な二辺のうち一辺L1の長さを閉磁路鉄心の直線鉄心部3′の積層厚tより大にし、他辺L2の長さを直線鉄心部3′の幅wよりも小にしたが、逆に一辺L1の長さを直線鉄心部の積層厚tよりも小にし、他辺L2の長さを直線鉄心部3′の幅wよりも大にしてよく、その場合はこれに対応した一対の切欠き12、12を1次コイルのボビンの一端の鍔の端部に形成する。
【0011】
【発明の効果】
本発明で使用する永久磁石の薄片の大きさは従来よりも小さいので、従来よりも点火コイルの絶対的な出力性能は低下するが、永久磁石の薄片が小形なためにコストは下がり、その上、閉磁路鉄心を組立てる際に永久磁石の薄片は動かないので組立てに手数がかからないと共に、永久磁石の薄片は直線鉄心部の一端の端面中央に位置決めして保持されるので、永久磁石の反磁界のかかりかたのバラツキを最小限に抑えることができる。更に、永久磁石の薄片の小型化に伴うフリンジング磁束の増加により永久磁石に直接かかる反磁界が減少するため、熱減磁しにくくなり、永久磁石の熱安定性が高まる。
【図面の簡単な説明】
【図1】(A)は1次コイル、永久磁石の薄片、閉磁路鉄心の直線鉄心部と環状鉄心部の分解状態の斜視図、(B)は1次コイルのボビンの一端の鍔が永久磁石の薄片を保持した状態を示す一部の断面図、(C)は(B)の矢印A方向から見た正面図。
【図2】従来の点火コイルの1般的な断面図。
【符号の説明】
1 1次コイル
3 閉磁路鉄心の外環鉄心部
3′ 閉磁路鉄心の直線鉄心部
9 永久磁石の薄片
11 1次コイルのボビン
11′ ボビンの一端の鍔
12 ボビンの一端の鍔の端部に設けた切欠き
1 一辺
2 他辺
t 積層厚
w 幅
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an iron core-coil assembly of an ignition coil for an internal combustion engine for supplying a high voltage to an ignition plug of an internal combustion engine such as an automobile engine to cause spark discharge.
[0002]
[Prior art]
As shown in FIG. 2, the mold type ignition coil for an internal combustion engine is usually a secondary coil 2, a primary coil 1 that penetrates the inner circumference of the secondary coil, and a straight line that penetrates the inner circumference of the primary coil. The outer ring core portion 3 of the closed magnetic circuit core including the iron core portion 3 ′ is accommodated in the insulating case 4, and the insulating case includes a high voltage cylinder 5 in which a high voltage terminal 6 that partially enters the inside of the insulating case is accommodated. An elastic pin 7 for connecting the winding end side of the secondary winding is attached to the bobbin of the secondary coil, and this elastic pin is brought into elastic contact with the intrusion end 6 'in the insulating case of the high-voltage terminal. The secondary coil 2, the primary coil 1, the closed magnetic circuit core, the elastic pin 7, and the high-voltage terminal 6 are fixed in the insulating case by the insulating resin layer 8 cast and solidified in the insulating case. And in order to increase the output of the ignition coil, as shown in the figure, the permanent magnet is placed between one end of the straight core portion 3 'of the closed magnetic circuit core and the inner periphery of the outer ring core portion 3 facing this one end portion. A square flake 9 may be interposed.
[0003]
In this case, the magnetic pole of the surface of the thin piece 9 of the permanent magnet facing the one end portion of the linear core portion 3 ′ and the magnetic pole of the opposite surface facing the inner periphery of the outer ring core portion 3 are energized to the primary coil. A permanent magnet flake is placed in series with the closed magnetic circuit in a direction that generates a magnetic flux that is opposite to the magnetic flux that is sometimes created, and a magnetic bias is applied to the closed magnetic circuit core to interrupt the current to the primary coil. The amount of change in magnetic flux is increased to increase the output.
[0004]
[Problems to be solved by the invention]
A conventional thin piece of a permanent magnet is a quadrangle that is the same size as the end face of the straight core portion 3 ′, and is attracted to the end face of one end portion of the straight core portion by a magnetic force and is located outside the flange at one end of the primary coil. Therefore, when assembled in a closed magnetic circuit core in combination with the outer ring core part 3, it moves in contact with the inner circumference of the outer ring core part, protrudes from the end face of one end of the linear core part, and does not work correctly, It takes a lot of work to push the protruding part back to the correct position, which causes a problem of reducing productivity. Furthermore, since the size of the quadrilateral of the thin piece 9 of the permanent magnet is the same as that of the end face of the straight iron core portion 3 ', it becomes large and the cost of the permanent magnet increases.
[0005]
[Means for Solving the Problems]
The present invention was developed in order to solve the above problems, and has a closed magnetic circuit core in which laminated plates are laminated on the inner periphery of a bobbin having ridges at both ends and wound with a primary coil on the outer periphery. A square of a permanent magnet is inserted between one end of the straight core portion and the inner circumference of the outer ring core portion of the closed magnetic circuit core surrounding the primary coil and the secondary coil through which the primary coil is inserted. In a core-coil assembly of an ignition coil for an internal combustion engine with a thin piece interposed therebetween, the length of the first side of the first and second sides of the square thin piece of the permanent magnet is defined as the straight core portion . while the larger than one of the width of the laminate constituting the multilayer thickness and a linear core portion of the laminate to the length of the second side, stacked thickness of the laminate constituting the linear core portion and a straight core section smaller than the other of the width of the laminate constituting the west, the center of the end portion of the flange at one end of the bobbin, depth permanent Equal to the thickness of the flakes of stone, and provided to face a notch for receiving a respective end of the first side to engage the ends of the first side to the notch, of the permanent magnet flakes a linear core portion is brought into contact with one end, characterized in that is held by the flange of one end of the bobbin.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention, wherein the length of the first side of the rectangular thin piece 9 of the permanent magnet 9 and the first side of the second side, that is, the side L 1 is defined as a straight line of the closed magnetic circuit core. core portions 3 'larger west than laminate thickness t (hereinafter, referred to as long side to side), a second side, i.e. the length of the other side L 2 is the linear core portions 3' in the smaller than the width w of the Yes (hereinafter, the other side is also referred to as the short side).
[0007]
And at the center of an end portion of one end of the flange 11 of the bobbin 11 of the primary coil ', the thickness and depth of the foil 9 of the permanent magnet is the same, each end of the long side L 1 of the flakes 9 (long side L 1 is provided to face the notches 12 and 12 facing each other, and the long side of the thin piece of the permanent magnet is provided in the notches 12 and 12. engaging the ends of the L 1.
[0008]
Of course, the linear iron core portion 3 ′ is inserted into the bobbin 11 of the primary coil, and one end thereof and the thin piece 9 of the permanent magnet are attracted by magnetic force, and each end portion of the long side L 1 of the thin piece 9 is Since it is engaged with the notches 12 and 12, it is held without moving.
[0009]
When the outer ring core 3 and the primary coil having the straight core 3 'on the inner periphery are assembled to assemble the closed magnetic circuit core, the thin piece of the permanent magnet rubs against the inner periphery of the outer ring core. Does not move, but adheres to the inner circumference. Note that the magnetic pole on the side facing the straight core portion 3 ′ of the thin piece of the permanent magnet and the magnetic pole on the side facing the inner circumference of the outer ring core portion are the same as described in the paragraph 0003 described above. When the current is interrupted, the amount of change in the magnetic flux of the closed magnetic circuit core is increased to increase the output of the ignition coil.
[0010]
In the illustrated embodiment, the length of one side L 1 out of two perpendicular sides of the thin section 9 of the permanent magnet is made larger than the laminated thickness t of the straight core portion 3 ′ of the closed magnetic circuit core, and the length of the other side L 2 is made straight. 'it was to be smaller than the width w of the reverse smaller than the laminated thickness t of the linear core portion the length of one side L 1 to west, straight core portion 3 the length of the other side L 2' core portion 3 the width of the In this case, a pair of notches 12 and 12 corresponding to this are formed at the end of the flange at one end of the bobbin of the primary coil.
[0011]
【The invention's effect】
Since the size of the thin piece of the permanent magnet used in the present invention is smaller than the conventional one, the absolute output performance of the ignition coil is lower than the conventional one, but the cost is lowered because the thin piece of the permanent magnet is small. When assembling the closed magnetic circuit core, the thin piece of the permanent magnet does not move, so it is not troublesome to assemble. The variation in how it is applied can be minimized. Further, since the demagnetizing field directly applied to the permanent magnet is reduced due to the increase in fringing magnetic flux accompanying the downsizing of the thin piece of the permanent magnet, it is difficult to thermally demagnetize and the thermal stability of the permanent magnet is enhanced.
[Brief description of the drawings]
FIG. 1A is a perspective view of a disassembled state of a primary coil, a thin piece of a permanent magnet, and a linear core portion and an annular core portion of a closed magnetic circuit core, and FIG. Partial sectional drawing which shows the state holding the thin piece of the magnet, (C) is the front view seen from the arrow A direction of (B).
FIG. 2 is a general sectional view of a conventional ignition coil.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Primary coil 3 Outer ring core part 3 'of a closed magnetic circuit iron core Straight core part 9 of a closed magnetic circuit iron core Thin piece 11 of a permanent magnet 11 Bobbin 11' of a primary coil At the end of the end of the bobbin 12 Notch provided L 1 side L 2 other side t stack thickness w width

Claims (1)

両端部に鍔を有し、外周に1次コイルが巻かれたボビンの内周に、積層板を積層した閉磁路鉄心の直線鉄心部を挿通し、前記直線鉄心部の一端と、上記1次コイル及び上記1次コイルが挿通された次コイルを囲む上記閉磁路鉄心の外環鉄心部の内周との間に永久磁石の四角い薄片を介在させた内燃機関用点火コイルの鉄心−コイル組立体において、
上記永久磁石の四角い薄片の直角な第1と第2辺とのうちの前記第1辺の長さを、上記直線鉄心部を構成する積層板の積層厚と上記直線鉄心部を構成する積層板のとの一方より大にすると共に、上記第2辺の長さを上記直線鉄心部を構成する積層板の積層厚と上記直線鉄心部を構成する積層板の幅との他方よりも小にし、上記ボビンの一端の鍔の端部の中央に、深さが上記永久磁石の薄片の厚さと等しく、且つ上記第1辺の各端部を受入れる切欠きを対向させて設け、上記第1辺の各端部を記切欠きに係合させ、上記永久磁石の薄片を上記直線鉄心部の一端に当接させて上記ボビンの一端の鍔に保持させた
ことを特徴とする内燃機関用点火コイルの鉄心−コイル組立体。
It has a flange at both ends, the inner periphery of the bobbin where the primary coil wound around the outer circumference, through interpolation straight core portion of the stacked laminates closed magnetic circuit iron core, one end of the previous SL linear core portions, the upper Symbol core of an ignition coil is interposed a square of permanent magnet flakes between the inner periphery of the outer ring core portion of the closed magnetic circuit iron core primary coil and the primary coil surrounds the inserted through two Tsugiko yl -In the coil assembly,
The length of the first side of the said square flakes perpendicular first side of the permanent magnet and the second side, constituting the laminated thickness of the laminate constituting the upper Symbol linear core portion and the straight core section while the larger than one of the width of the laminate, the other between the length of the second side, the width of the laminate constituting the multilayer thickness and the linear core portions of the laminate constituting the straight core section Less than the center of the edge of the flange at one end of the bobbin , the depth is equal to the thickness of the thin piece of the permanent magnet, and provided with a notch for receiving each end of the first side, It engaged with each end of the first side in-out before Symbol notch, and the flakes of the permanent magnet is brought into contact with one end of said linear core portion is held by the flange of one end of the bobbin,
An iron core-coil assembly of an ignition coil for an internal combustion engine.
JP2002376480A 2002-12-26 2002-12-26 Iron core-coil assembly of ignition coil for internal combustion engine Expired - Fee Related JP3784367B2 (en)

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