JPH0845753A - Ignition coil - Google Patents
Ignition coilInfo
- Publication number
- JPH0845753A JPH0845753A JP7172031A JP17203195A JPH0845753A JP H0845753 A JPH0845753 A JP H0845753A JP 7172031 A JP7172031 A JP 7172031A JP 17203195 A JP17203195 A JP 17203195A JP H0845753 A JPH0845753 A JP H0845753A
- Authority
- JP
- Japan
- Prior art keywords
- iron core
- permanent magnet
- ignition coil
- magnet
- 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.)
- Granted
Links
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は主として車両用内燃機関
に用いられる改良された点火コイルに関する。FIELD OF THE INVENTION The present invention relates to an improved ignition coil primarily used in internal combustion engines for vehicles.
【０００２】[0002]
【従来の技術】永久磁石を鉄心の空隙部に挿入すること
により点火コイル等の電磁コイルに蓄積されるエネルギ
ーを増大する提案は、例えば、従来技術文献の実開４８
−４９４２５号、西独実用新案登録第７９２４９８９
号、特開昭５９−１６７００６号、米国特許第４，５４
６，７５３号などによってなされている。しかしなが
ら、上記の従来技術文献のいずれにおいても、どのよう
な形状、寸法等の鉄心及び永久磁石を含む磁気回路を有
する構成とすれば効率のよい点火コイルを得ることがで
きるかという点については何ら確立された技術の開示は
なく、また今まで実用に供された点火コイルにおいて
も、特に永久磁石を加えた割には、従前のものに比しさ
ほどの性能向上、あるいは小形化が達成されていない。
一方、近年、点火コイルの鉄心中に挿入して使用すれ
ば、その鉄心を飽和させるほどの磁束を生じさせうる、
Ｓｍ（サマリューム）、Ｎｄ（ネオジウム）等の元素を
含有する強力な永久磁石材料が開発され、かつ、量産さ
れるようになってその用途の拡大が期待されるに至っ
た。そのため上記のような点火コイルに適用するのに好
適な特性を有する永久磁石の材料の入手が容易になって
きた。2. Description of the Related Art Proposals for increasing the energy stored in an electromagnetic coil such as an ignition coil by inserting a permanent magnet into an air gap of an iron core have been made, for example, in Japanese Utility Model Publication 48 of the prior art document.
-49425, West German Utility Model Registration No. 79244989
No. 59-167006, U.S. Pat. No. 4,54.
No. 6,753. However, in any of the above-mentioned prior art documents, what is the shape, size, etc. of the configuration that has a magnetic circuit including an iron core and a permanent magnet? There is no disclosure of established technology, and even in the ignition coils that have been put to practical use up to now, performance improvement or miniaturization has been achieved in comparison with the conventional ones, especially with the addition of permanent magnets. Absent.
On the other hand, in recent years, if it is used by inserting it into the iron core of the ignition coil, it is possible to generate a magnetic flux enough to saturate the iron core.
A strong permanent magnet material containing elements such as Sm (samarium) and Nd (neodymium) has been developed and mass-produced, and its application has been expected to expand. Therefore, it has become easy to obtain the material of the permanent magnet having the characteristics suitable for being applied to the ignition coil as described above.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、適切な形
状、寸法等の鉄心及び永久磁石を含む磁気回路を有する
構成を用いて上記の強力な永久磁石材料を有効に活用
し、飛躍的に小形軽量化された点火コイルを提供するこ
とを目的とする。DISCLOSURE OF THE INVENTION The present invention dramatically utilizes the above-mentioned strong permanent magnet material effectively by using a structure having a magnetic circuit including an iron core and a permanent magnet having an appropriate shape and size. An object of the present invention is to provide a small and lightweight ignition coil.
【０００４】[0004]
【課題を解決するための手段】本発明は、上述の目的を
達成するために、種々の研究と実験との結果から得られ
た事実およびデータに基づいて求められた鉄心および永
久磁石の大きさ並びにそれらの関係が、 ２＜ＳM ／ＳF ＜６ １．５＜ＳG ／ＳF ＜４．５ という条件を満たすように構成された点火コイルを提供
する。SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is based on the facts and data obtained from the results of various studies and experiments to determine the sizes of iron cores and permanent magnets. And their relationship provides an ignition coil configured to meet the conditions 2 <SM / SF <6 1.5 <SG / SF <4.5.
【０００５】また、本発明は、 ０．６mm ＜ＬM ＜ １．８mm ２＜ＳM ／ＳF ＜６ １．５＜ＳG ／ＳF ＜４．５ という条件を満たすように構成された点火コイルを提供
する。ここで、ＬM は、永久磁石の厚みを、ＳM は空隙
部における磁石の断面積を、ＳF は一次コイルへの通電
により発生する磁束が鎖交する鉄心の最小の断面積を、
ＳG は空隙部に面する鉄心の面積を示す。The present invention also provides an ignition coil configured to satisfy the condition of 0.6 mm <LM <1.8 mm 2 <SM / SF <6 1.5 <SG / SF <4.5. . Where LM is the thickness of the permanent magnet, SM is the cross-sectional area of the magnet in the air gap, and SF is the minimum cross-sectional area of the iron core with which the magnetic flux generated by energizing the primary coil interlinks.
SG represents the area of the iron core facing the void.
【０００６】なお、比率ＳM ／ＳF と前記比率ＳG ／Ｓ
F とは共に２以上４．５以下の範囲内にあることが望ま
しい。また、永久磁石は、サマリューム、ネオジウム等
の元素を含有する永久磁石、すなわちいわゆる希土類を
含有する希土類磁石であることが望ましく、例えばサマ
リューム−コバルト（ＳｍＣｏ5 ）磁石とすることがで
きる。The ratio SM / SF and the ratio SG / S
It is desirable that both F and F are in the range of 2 or more and 4.5 or less. Further, the permanent magnet is preferably a permanent magnet containing an element such as Somerium or neodymium, that is, a rare earth magnet containing a so-called rare earth, for example, a Somerium-Cobalt (SmCo 5 ) magnet can be used.
【０００７】[0007]
【作用】本発明の点火コイルにおいては、一次コイル及
び二次コイルが巻装された閉磁路を形成する鉄心の一部
分に設けられた空隙部に永久磁石が挿入されており、一
次コイルに通電する以前には、上記永久磁石の磁化力に
より一次コイルの通電による磁化方向とは逆の向きに鉄
心を負方向の最大使用磁束密度まで磁化しておく。次
に、上記点火コイルの使用時には、一次コイルに励磁電
流を流すことにより上記永久磁石の磁化力とは逆方向の
磁化力を発生させ、それにより鉄心を正方向の最大使用
磁束密度まで磁化する。この状態で、点火時期において
一次電流を遮断すれば、二次コイルの有効交差磁束とし
ては、永久磁石を含まないで一次コイルの通電によって
のみ鉄心を正方向の最大使用磁束密度まで磁化する従来
の点火コイルによって利用できる有効交差磁束の倍量利
用できる。従って一定の火花エネルギを発生させるため
に必要な点火コイルの体積とてしは、本発明による点火
コイルは、従来の点火コイルと比べて格段に小さくする
ことが可能になる。In the ignition coil of the present invention, the permanent magnet is inserted into the void portion provided in a part of the iron core forming the closed magnetic circuit around which the primary coil and the secondary coil are wound, and the primary coil is energized. Previously, the iron core was magnetized by the magnetizing force of the permanent magnet in the direction opposite to the magnetizing direction due to energization of the primary coil up to the maximum usable magnetic flux density in the negative direction. Next, when the ignition coil is used, an exciting current is passed through the primary coil to generate a magnetizing force in a direction opposite to the magnetizing force of the permanent magnet, thereby magnetizing the iron core to the maximum usable magnetic flux density in the positive direction. . In this state, if the primary current is cut off at the ignition timing, the effective cross magnetic flux of the secondary coil does not include a permanent magnet, and the iron core is magnetized to the maximum usable magnetic flux density in the positive direction only by energizing the primary coil. Double the amount of effective cross flux available with the ignition coil. Therefore, as for the volume of the ignition coil required to generate a constant spark energy, the ignition coil according to the present invention can be made significantly smaller than the conventional ignition coil.
【０００８】[0008]
【実施例】以下、本発明をさらに詳細に説明する。な
お、長さ寸法を示す英文字Ｌは明細書中では数字などと
の混同を避ける意味で大文字のＬを用いるが、図中には
小文字を用いて記述している。図１は、一例として、い
わゆる外鉄形鉄心を用いた場合における、本発明による
点火コイルの永久磁石を嵌装した鉄心の基本的な磁気回
路の構成図である。図１の本発明の点火コイルの磁気回
路において、ＳF は磁束Φが通る巻線部の鉄心の断面積
を示しＳG は永久磁石挿入部の鉄心の断面積を示し、Ｌ
F は鉄心の平均磁路長を示し、ＳM は永久磁石の断面積
を示しＬM は永久磁石の厚みを示している。The present invention will be described in more detail below. In the specification, an English letter L indicating a length dimension is an uppercase letter L in order to avoid confusion with a numeral or the like, but the lowercase letter is used in the drawing. As an example, FIG. 1 is a configuration diagram of a basic magnetic circuit of an iron core fitted with a permanent magnet of an ignition coil according to the present invention when a so-called outer iron core is used. In the magnetic circuit of the ignition coil of the present invention shown in FIG. 1, SF represents the cross-sectional area of the iron core of the winding portion through which the magnetic flux Φ passes, SG represents the cross-sectional area of the iron core of the permanent magnet insertion portion, and L
F represents the average magnetic path length of the iron core, SM represents the cross-sectional area of the permanent magnet, and LM represents the thickness of the permanent magnet.
【０００９】図２は、本発明による点火コイルの基本的
な磁気動作を説明するための動作特性図である。図２を
参照すると、本発明の点火コイルの巻線部の鉄心上に巻
数ｎの一次コイルを巻回し、負方向の磁束−Φ´を生じ
させる永久磁石の磁化の向きとは逆の向きの磁束＋Φ´
が巻線部の鉄心中に生じるように、一次コイルに励磁電
流ＩP ´を流した場合における一次コイルの蓄積エネル
ギは、図２の中のハッチング部の面積Ｗ´で表わされ、
そのＷ´の大きさは、FIG. 2 is an operating characteristic diagram for explaining the basic magnetic operation of the ignition coil according to the present invention. Referring to FIG. 2, the primary coil of the winding number n is wound around the iron core of the winding portion of the ignition coil of the present invention, and the direction opposite to the magnetization direction of the permanent magnet that causes the negative magnetic flux −Φ ′ is generated. Magnetic flux + Φ '
Is generated in the iron core of the winding portion, the energy stored in the primary coil when the exciting current IP 'flows through the primary coil is represented by the hatched area W'in FIG.
The size of W'is
【００１０】[0010]
【数１】 である。そして、この永久磁石入り点火コイルの一次コ
イルの蓄積エネルギＷ´を最大にするためには、図３に
示した本発明の好適実施例の点火コイルの磁気動作特性
図の左下の負の磁束の領域において、鉄心の負の磁束の
飽和点の近傍のＣ点まで永久磁石の磁化力によって鉄心
を磁化する必要がある。[Equation 1] Is. In order to maximize the stored energy W'of the primary coil of the ignition coil with a permanent magnet, the negative magnetic flux at the lower left of the magnetic operation characteristic diagram of the ignition coil of the preferred embodiment of the present invention shown in FIG. In the region, it is necessary to magnetize the iron core to the point C near the saturation point of the negative magnetic flux of the iron core by the magnetizing force of the permanent magnet.
【００１１】一方、図３の中の正の磁束の領域を示した
図４を参照し、本発明の点火コイルの一次コイルの励磁
電流の最大値に対応した好適な鉄心の最大使用磁束密度
の値のとり方について説明する。図４において、曲線ａ
は鉄心の磁化曲線を、直線ｂは永久磁石の磁化曲線を、
曲線ｃは曲線ａ及び直線ｂのそれぞれの磁化力の和の磁
化力を示す一次コイルの磁化曲線を示している。そし
て、本発明の点火コイルの鉄心の好適な最大使用磁束密
度ＢF の値は、図４において、直線ｂに平行に引いた曲
線ａの切線の切点Ｔに対応した鉄心の磁束密度の値とし
て与えられる。On the other hand, referring to FIG. 4 showing the region of the positive magnetic flux in FIG. 3, the maximum usable magnetic flux density of the preferred iron core corresponding to the maximum value of the exciting current of the primary coil of the ignition coil of the present invention is shown. How to take the value will be described. In FIG. 4, the curve a
Is the magnetization curve of the iron core, the straight line b is the magnetization curve of the permanent magnet,
The curve c shows the magnetization curve of the primary coil showing the sum of the magnetizing forces of the curve a and the straight line b. The value of the preferred maximum magnetic flux density BF of the iron core of the ignition coil of the present invention is the value of the magnetic flux density of the iron core corresponding to the cut point T of the cutting line of the curve a drawn in parallel with the straight line b in FIG. Given.
【００１２】他方、一次コイルの磁化曲線の傾きは、永
久磁石の透磁率μによって決まるので図３のハッチング
部の面積Ｗで表わされる一次コイルの蓄積エネルギを大
きくするためには、μの値ができるだけ１に近い永久磁
石材料を選定することが肝要である。次に図１に示した
本発明の点火コイルの永久磁石の厚さＬM の大きさと断
面積比On the other hand, since the inclination of the magnetization curve of the primary coil is determined by the magnetic permeability μ of the permanent magnet, in order to increase the energy stored in the primary coil represented by the area W of the hatched portion in FIG. It is important to select a permanent magnet material that is as close to 1 as possible. Next, the size of the thickness LM of the permanent magnet of the ignition coil of the present invention shown in FIG.
【００１３】[0013]
【数２】 の値との関係を調べる。[Equation 2] Check the relationship with the value of.
【００１４】図３の中の正の磁束の領域について考える
と、そこに示されたように、一次コイルの励磁電流によ
る磁化力ｎＩｐ／２は、鉄心の磁化力ＨF ・ＬF （ただ
しＨF は鉄心中の磁界）と永久磁石を含む空隙部にかか
る磁化力Ｈ・ＬM （ただしＨは該空隙部に生じる磁界）
との和であるから、従ってConsidering the region of positive magnetic flux in FIG. 3, as shown therein, the magnetizing force nIp / 2 due to the exciting current of the primary coil is equal to the magnetizing force HF.LF of the iron core (where HF is the iron (Magnetic field in the heart) and magnetizing force H · LM (where H is the magnetic field generated in the void) applied to the void containing the permanent magnet.
Is the sum of
【００１５】[0015]
【数３】 他方に、永久磁石内の磁束密度はＢM ＝μＨと表される
ので、(Equation 3) On the other hand, since the magnetic flux density in the permanent magnet is expressed as BM = μH,
【００１６】[0016]
【数４】 [Equation 4]
【００１７】磁石を含む空隙部における平均磁束密度Ｂ
G とすればAverage magnetic flux density B in the void including the magnet
If G
【００１８】[0018]
【数５】ＢG ・ＳG ＝ＢF ・ＳF 後述するように、本発明の点火コイルの鉄心及び永久磁
石の好適な構成においては、[Expression 5] BG · SG = BF · SF As will be described later, in the preferred configuration of the iron core and the permanent magnet of the ignition coil of the present invention,
【００１９】[0019]
【数６】ＳG ≒ＳM のように選定されるため[Equation 6] Since it is selected as SG ≈ SM
【００２０】[0020]
【数７】ＳG ≒ＢM であり、上記の等式は、## EQU7 ## SG ≈BM, and the above equation becomes
【００２１】[0021]
【数８】ＢM ・ＳG ＝ＢF ・ＳF と表される。従って、
上記のＢM の式と組み合わせて、## EQU8 ## It is expressed as BM.SG = BF.SF. Therefore,
In combination with the above formula of BM,
【００２２】[0022]
【数９】 [Equation 9]
【００２３】これより、ＬM の大きさを表す式として、From this, as an expression representing the size of LM,
【００２４】[0024]
【数１０】 [Equation 10]
【００２５】が導かれ、上式を変形すれば、断面積比If the above equation is transformed by
【００２６】[0026]
【数１１】 を表す式として、[Equation 11] As an expression
【００２７】[0027]
【数１２】 が導かれる。(Equation 12) Is guided.
【００２８】また、本発明の点火コイルでは、図３の動
作特性曲線図のハッチング部分のうち、負の磁束の領域
は、一次コイルの磁化力によって、磁石の持つエネルギ
に逆らって鉄心中に正の磁束を通す向きに磁化する領域
であるから、前述の如く、最初は図３の左下の鉄心の負
の磁束の飽和点の近傍のＣ点まで永久磁石の磁化力によ
って鉄心を磁化しておき、次に、一次コイルに励磁電流
Ｉｐを流すことにより生じる磁化力ｎＩｐにより図３の
右上の正の磁束の飽和点の近傍のＴ点まで鉄心を磁化し
た場合において、その材質及び形状によって与えられる
永久磁石の持つ最大エネルギＥM と図３にＷで示された
一次コイルの蓄積エネルギとの関係はFurther, in the ignition coil of the present invention, in the hatched portion of the operation characteristic curve diagram of FIG. 3, the negative magnetic flux region is positive in the iron core against the energy of the magnet due to the magnetizing force of the primary coil. As described above, the iron core is first magnetized by the magnetizing force of the permanent magnet up to the point C near the saturation point of the negative magnetic flux of the iron core in the lower left of FIG. 3, as described above. Next, when the iron core is magnetized to the point T near the saturation point of the positive magnetic flux in the upper right of FIG. 3 by the magnetizing force nIp generated by flowing the exciting current Ip in the primary coil, it is given by the material and shape of the iron core. The relationship between the maximum energy EM of the permanent magnet and the stored energy of the primary coil shown by W in FIG.
【００２９】[0029]
【数１３】 である。(Equation 13) Is.
【００３０】図３の面積Ｗの大きさは、The size of the area W in FIG. 3 is
【００３１】[0031]
【数１４】 である。他方、永久磁石の最大エネルギ積は（Ｂ・Ｈ）
MAX で表され、そして永久磁石の持つ最大エネルギＥM
の理論値は、[Equation 14] Is. On the other hand, the maximum energy product of a permanent magnet is (BH)
Maximum energy EM represented by MAX and possessed by a permanent magnet
The theoretical value of
【００３２】[0032]
【数１５】ＥM ＝（Ｂ・Ｈ）MAX ・（ＳM ・ＬM ） と表される。本発明の点火コイルにおいては、図４に示
した前述の永久磁石の磁化曲線ｂの傾きによって決まる
永久磁石の動作点としては、最大エネルギ積（Ｂ・Ｈ）
MAX を与える動作もしくはその近傍の動作点が選定され
る。[Expression 15] EM = (B.H) MAX. (SM.LM) In the ignition coil of the present invention, the maximum energy product (BH) is set as the operating point of the permanent magnet determined by the inclination of the magnetization curve b of the permanent magnet shown in FIG.
An operation point that gives MAX or an operation point in the vicinity thereof is selected.
【００３３】従って、一次コイルの蓄積エネルギTherefore, the energy stored in the primary coil
【００３４】[0034]
【数１６】Ｗ＝ＢF ・ＳF ・ｎＩｐ ＝２ＥM ＝２（Ｂ・Ｈ）MAX ・（ＳM ・ＬM ） 上式より、断面積比[Equation 16] W = BF · SF · nIp = 2EM = 2 (B · H) MAX · (SM · LM) From the above equation, the cross-sectional area ratio
【００３５】[0035]
【数１７】 を表す式として、[Equation 17] As an expression
【００３６】[0036]
【数１８】 が得られる。(Equation 18) Is obtained.
【００３７】上記の２つの式（１）及び（２）は、本発
明の点火コイルにおいて、永久磁石のエネルギを最も効
果的に利用するために選定されるべき磁気回路の各部の
寸法の関係を表している。次に、本発明による点火コイ
ルを具体的に構成した後、その性能テストを行った結果
について説明する。ここで、本発明の点火コイルを具体
的に構成するために、前述の式（１）及び（２）に対し
て適用するべく選定された諸元の値は下記の通りであ
る。永久磁石材料はＳm ＣO5を用いたが、その諸元は、The above two equations (1) and (2) represent the dimensional relationship of each part of the magnetic circuit which should be selected in order to most effectively use the energy of the permanent magnet in the ignition coil of the present invention. It represents. Next, the results of performance tests of the ignition coil according to the present invention after being concretely configured will be described. Here, in order to specifically configure the ignition coil of the present invention, the values of the parameters selected to be applied to the above equations (1) and (2) are as follows. Permanent magnet material has been used S m C O5, its specifications are
【００３８】[0038]
【数１９】（ＢＨ）MAX ＝２０メガＧ・Ｏｅ μ ＝１．０５ また、鉄心材料は無方向性けい素鋼板を用いたがその諸
元は、(BH) MAX = 20 Mega G · Oe μ = 1.05 Further, as the core material, a non-oriented silicon steel plate was used, but the specifications are as follows:
【００３９】[0039]
【数２０】ＳF ＝４９ｍｍ2 、ＢF ＝１．４Ｗｂ／ｍ2 ｎＩｐ＝８００ＡＴ、ＨF ＝１５０ＡＴ／ｍ ＬF ＝０．１ｍ 上記の諸元を式（１）及び（２）に代入して求めた断面
比[Equation 20] SF = 49 mm 2 , BF = 1.4 Wb / m 2 nIp = 800 AT, HF = 150 AT / m LF = 0.1 m The above specifications were substituted into the equations (1) and (2). Cross section ratio
【００４０】[0040]
【数２１】 及び[Equation 21] as well as
【００４１】[0041]
【数２２】 のそれぞれとＬM との関係を図５及び図６に示した。な
お、同時にＬM を変えたとき得られるそれぞれの各部寸
法を有する点火コイルについて性能テストを行い、得ら
れた二次コイル発生電圧Ｖ2 を、それぞれ図５及び図６
中に図示した。なお、図６は、図５に示された二次発生
電圧Ｖ2 の分布を示す曲線を、永久磁石の厚みＬM と二
次発生電圧Ｖ2 との間の関係を示す二次元特性曲線に変
えて見易く表示したものである。[Equation 22] The relationship between each of these and LM is shown in FIGS. 5 and 6. A performance test was conducted on ignition coils having respective dimensions obtained when LM was changed at the same time, and the obtained secondary coil generated voltage V 2 was measured as shown in FIGS.
Illustrated inside. Note that FIG. 6 changes the curve showing the distribution of the secondary generated voltage V 2 shown in FIG. 5 into a two-dimensional characteristic curve showing the relationship between the thickness LM of the permanent magnet and the secondary generated voltage V 2. The display is easy to see.
【００４２】このようにして得られた図５及び図６に図
示の結果によってわかったことは、本発明の点火コイル
の最適の寸法条件としては、What was found from the results shown in FIGS. 5 and 6 thus obtained is that the optimum dimensional conditions for the ignition coil of the present invention are as follows.
【００４３】[0043]
【数２３】（イ）ＳG ≒ＳM すなわち永久磁石挿入部の鉄心断面積と永久磁石とがほ
ぼ等しくなった状態の近傍にあること、及び(B) SG ≈ SM, that is, the iron core cross-sectional area of the permanent magnet insertion portion and the permanent magnet are in the vicinity of a substantially equal state, and
【００４４】[0044]
【数２４】 の値が下記の範囲内にあれば、二次発生電圧Ｖ2 が顕著
に高くなること、[Equation 24] If the value of is within the following range, the secondary generated voltage V 2 will be remarkably high.
【００４５】[0045]
【数２５】０．６ｍｍ＜ＬM ＜１．８ｍｍ ２＜ＳM ／ＳF ＜６ １．５＜ＳG ／ＳF ＜４．５ である。[Equation 25] 0.6 mm <LM <1.8 mm 2 <SM / SF <6 1.5 <SG / SF <4.5.
【００４６】なお、上記の本発明の点火コイルの性能テ
ストの終了後の調査結果によれば、使用した永久磁石の
諸特性には上記性能テストの前後を通して変化は認めら
れず、従って本発明の点火コイルは、所望の性能を維持
しつつ連続的使用に耐えうることは明らかである。以上
に説明した最適の寸法条件を満たすような構成を有する
本発明による点火コイルと、従来技術による点火コイル
との間の具体的な数値の比較について以下に説明する。According to the results of the investigation after the performance test of the ignition coil of the present invention, no change was observed in the characteristics of the permanent magnet used before and after the performance test. It is clear that the ignition coil can withstand continuous use while maintaining the desired performance. A comparison of specific numerical values between the ignition coil according to the present invention and the ignition coil according to the prior art, which have the above-described configuration satisfying the optimum size condition, will be described below.
【００４７】図７及び図８は、本発明の点火コイルと従
来技術の点火コイルとが同一の性能を有するように、両
者は、同じ抵抗値を有し、かつ、同じ巻数の巻線を用い
ることにより同じＡＴ値を有し、同じ大きさの二次発生
電圧を生じるように構成した場合における、それぞれ本
発明及び従来技術による点火コイルの縦断面構造を示し
ている。FIGS. 7 and 8 show that the ignition coil of the present invention and the ignition coil of the prior art have the same performance so that they have the same resistance value and the same number of turns. Thus, there are shown longitudinal sectional structures of the ignition coil according to the present invention and the prior art, respectively, in the case where the secondary coils have the same AT value and are configured to generate the same secondary generated voltage.
【００４８】下記の比較表は、図７及び図８にそれぞれ
示した本発明及び従来技術による点火コイルの諸元を比
較して示したものである。The following comparison table compares the specifications of the ignition coil according to the present invention and the prior art shown in FIGS. 7 and 8, respectively.
【００４９】[0049]
【表１】 [Table 1]
【００５０】上記のように構成された本発明による点火
コイルと従来技術による点火コイルの諸元の比較結果に
よれば、同一性能を発揮させるような構成とした場合、
本発明の点火コイルでは、その巻線部の鉄心断面積ＳF
を、従来技術の点火コイルのそれの約１／２に激減させ
ることができ、従って巻線部の鉄心の周囲長は約According to the results of comparison of the specifications of the ignition coil according to the present invention and the ignition coil according to the prior art constructed as described above, in the case where the same performance is exhibited,
In the ignition coil of the present invention, the core cross-sectional area SF of the winding portion is
Can be drastically reduced to about 1/2 of that of the ignition coil of the prior art, so that the circumference of the winding core is about
【００５１】[0051]
【数２６】 (Equation 26)
【００５２】に減少し、それにより鉄心重量は１／３近
くまで減少し、全巻線スペースは１／２近くまで減少す
る。その結果、完成品総重量は１／２以下に減少させる
ことができ、かくして本発明の点火コイルは、従来技術
の点火コイルと比べて、飛躍的な小形軽量化を達成する
ことができることが明らかになった。As a result, the weight of the iron core is reduced to nearly 1/3, and the total winding space is reduced to nearly 1/2. As a result, the total weight of the finished product can be reduced to 1/2 or less, and thus it is clear that the ignition coil of the present invention can achieve a drastic reduction in size and weight as compared with the ignition coils of the prior art. Became.
【００５３】[0053]
【発明の効果】本発明による点火コイルにおいては、そ
の磁気回路中に嵌装された強力な永久磁石の機能を有効
に活用するために、適切な形状、寸法等の鉄心及び永久
磁石を含む磁気回路を有する構成を具現することによ
り、同一性能を有する従来技術による点火コイルと比べ
て、飛躍的に小形軽量化された点火コイルが得られると
いうすぐれた効果を奏する。In the ignition coil according to the present invention, in order to effectively utilize the function of the strong permanent magnet fitted in the magnetic circuit, the magnet including the iron core and the permanent magnet having an appropriate shape and size is used. By embodying the configuration having the circuit, it is possible to obtain an excellent effect that an ignition coil which is drastically reduced in size and weight can be obtained as compared with the ignition coil according to the prior art having the same performance.
【図１】図１は、本発明の点火コイルの永久磁石を嵌装
した鉄心の基本的な磁気回路の構成図である。FIG. 1 is a configuration diagram of a basic magnetic circuit of an iron core fitted with a permanent magnet of an ignition coil of the present invention.
【図２】図２は、本発明の点火コイルの基本的磁気動作
を説明するための動作特性図である。FIG. 2 is an operating characteristic diagram for explaining a basic magnetic operation of the ignition coil according to the present invention.
【図３】図３は、本発明の好適実施例の点火コイルの磁
気動作特性図である。FIG. 3 is a magnetic operating characteristic diagram of an ignition coil according to a preferred embodiment of the present invention.
【図４】図４は、図３の磁気動作特性図の正の磁束の領
域について、鉄心の最大使用磁束密度の値のとり方を説
明するための説明図である。FIG. 4 is an explanatory diagram for explaining how to obtain a value of the maximum usable magnetic flux density of the iron core in the positive magnetic flux region of the magnetic operation characteristic diagram of FIG. 3.
【図５】図５は、本発明の具体的実施例の点火コイルに
おける断面積比ＳG ／ＳF 及びＳM ／ＳF 並びに二次コ
イル発生電圧Ｖ2 と永久磁石の厚みＬM との関係を示す
特性図である。FIG. 5 is a characteristic diagram showing the relationship between the cross-sectional area ratios SG / SF and SM / SF, the secondary coil generated voltage V2, and the thickness LM of the permanent magnet in the ignition coil according to the specific embodiment of the present invention. is there.
【図６】図６は、本発明の具体的実施例の点火コイルに
おける断面積比ＳG ／ＳF 及びＳM ／ＳF 並びに二次コ
イル発生電圧Ｖ2 と永久磁石の厚みＬM との関係を示す
特性図であり、二次発生電圧Ｖ2 対永久磁石の厚みＬM
の特性曲線を図示している。FIG. 6 is a characteristic diagram showing the relationship between the cross-sectional area ratios SG / SF and SM / SF, the secondary coil generated voltage V2, and the thickness LM of the permanent magnet in the ignition coil of the specific example of the present invention. Yes, secondary generated voltage V2 vs. thickness of permanent magnet LM
The characteristic curve of is illustrated.
【図７】図７は、本発明と従来技術との比較を行なうた
めに作成した、本発明による点火コイルの縦断面図であ
る。FIG. 7 is a vertical cross-sectional view of an ignition coil according to the present invention, which was prepared to compare the present invention with a conventional technique.
【図８】図８は、本発明と従来技術との比較を行なうた
めに作成した、従来技術による点火コイルの縦断面図で
ある。FIG. 8 is a vertical cross-sectional view of an ignition coil according to the related art, which is prepared for comparing the present invention with the related art.
ＳM 永久磁石の断面積 ＬM （ｌM ） 久磁石の厚み ＳF 巻線部の鉄心断面積（鉄心の最小断面積） ＳG 永久磁石挿入部の鉄心断面積（空隙部に面する鉄
心の面積） ＬF （ｌF ） 鉄心の平均磁路長 ＢM 永久磁石内の磁束密度 μ 永久磁石の透磁率 ＢF 鉄心の最大使用磁束密度 ＢG 磁石を含む空隙部の平均磁束密度 ｎIp 一次電流Ｉp により生じる磁化力 ＨF 鉄心中の磁界 Ｈ 鉄心の空隙部（永久磁石）の中の磁界SM Cross-sectional area of permanent magnet LM (1M) Permanent magnet thickness SF Core cross-sectional area of winding core (minimum cross-sectional area of iron core) SG Core cross-sectional area of permanent magnet insertion part (area of core facing void) LF ( 1F) Average magnetic path length of the iron core BM Magnetic flux density in the permanent magnet μ Permeability of the permanent magnet BF Maximum magnetic flux density of the iron core BG Average magnetic flux density in the gap containing the magnet nIp Magnetizing force generated by the primary current Ip HF In the iron core Magnetic field H Magnetic field in the void (permanent magnet) of the iron core
Claims (5)
して閉磁路を形成する鉄心と、 （ロ）前記鉄心の外周に巻回され、通電されることによ
り鉄心を励磁する一次コイルと、 （ハ）前記鉄心に巻回された二次コイルと、 （ニ）前記鉄心の空隙部に挿入され、前記一次コイルへ
の通電による励磁方向とは逆方向に磁化された板状の永
久磁石とを備えた点火コイルであって、 （ホ）前記空隙部は、前記鉄心の磁束経路上に唯一箇所
だけ設けられており、 （ヘ）前記鉄心と前記永久磁石とは、前記空隙部におけ
る前記磁石の断面積をＳM 、前記空隙部に面する鉄心の
面積をＳG 、さらに前記一次コイルへの通電による磁束
が鎖交する前記鉄心の最小の断面積をＳF とした場合
に、下記の条件を満たすように構成されたことを特徴と
する点火コイル。 ２＜ＳM ／ＳF ＜６ １．５＜ＳG ／ＳF ＜４．５1. An iron core that forms a closed magnetic circuit through a void portion provided in a part of the iron core, and (b) a primary coil that is wound around the outer circumference of the iron core and that excites the iron core when energized. A coil, (c) a secondary coil wound around the iron core, and (d) a plate-like magnet which is inserted into the void of the iron core and magnetized in a direction opposite to the direction of excitation by energization of the primary coil. An ignition coil including a permanent magnet, (e) the void is provided only on a magnetic flux path of the iron core, and (f) the iron core and the permanent magnet are the void. Where SM is the cross-sectional area of the magnet, SG is the area of the iron core facing the air gap, and SF is the minimum cross-sectional area of the iron core where the magnetic flux due to energization of the primary coil interlinks, Ignition coil characterized by being configured to meet the conditions 2 <SM / SF <6 1.5 <SG / SF <4.5
して閉磁路を形成する鉄心と、 （ロ）前記鉄心の外周に巻回され、通電されることによ
り鉄心を励磁する一次コイルと、 （ハ）前記鉄心に巻回された二次コイルと、 （ニ）前記鉄心の空隙部に挿入され、前記一次コイルへ
の通電による励磁方向とは逆方向に磁化された板状の永
久磁石とを備えた点火コイルであって、 （ホ）前記空隙部は、前記鉄心の磁束経路上に唯一箇所
だけ設けられており、 （ヘ）前記鉄心と前記永久磁石とは、前記磁石の厚みを
ＬM 、前記空隙部における前記磁石の断面積をＳM 、前
記空隙部に面する鉄心の面積をＳG 、さらに前記一次コ
イルへの通電による磁束が鎖交する前記鉄心の最小の断
面積をＳF とした場合に、下記の条件を満たすように構
成されたことを特徴とする点火コイル。 ０．６mm ＜ＬM ＜ １．８mm ２＜ＳM ／ＳF ＜６ １．５＜ＳG ／ＳF ＜４．５2. An iron core which forms a closed magnetic circuit through a void portion provided in a part thereof, and (b) a primary coil which is wound around an outer periphery of the iron core and which is energized to energize the iron core. A coil, (c) a secondary coil wound around the iron core, and (d) a plate-like magnet which is inserted into the void of the iron core and magnetized in a direction opposite to the direction of excitation by energization of the primary coil. An ignition coil comprising a permanent magnet, (e) the void portion is provided only on a magnetic flux path of the iron core, (f) the iron core and the permanent magnet are The thickness is LM, the cross-sectional area of the magnet in the void is SM, the area of the iron core facing the void is SG, and the minimum cross-sectional area of the iron core where the magnetic flux due to energization of the primary coil is linked to SF. If the above conditions are met, the following conditions are satisfied. Ignition coil, characterized. 0.6mm <LM <1.8mm 2 <SM / SF <6 1.5 <SG / SF <4.5
F とは共に２以上４．５以下の範囲内にあることを特徴
とする請求項１または２記載の点火コイル。3. The ratio SM / SF and the ratio SG / S
The ignition coil according to claim 1 or 2, wherein both F and F are in the range of 2 or more and 4.5 or less.
ウム等の元素を含有する永久磁石であることを特徴とす
る請求項１ないし３のいずれかに記載の点火コイル。4. The ignition coil according to claim 1, wherein the permanent magnet is a permanent magnet containing an element such as Somerium or Neodymium.
ト（ＳｍＣｏ5 ）系磁石であることを特徴とする請求項
４記載の点火コイル。5. The ignition coil according to claim 4, wherein the permanent magnet is a Samarium-Cobalt (SmCo 5 ) magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7172031A JP2715403B2 (en) | 1995-07-07 | 1995-07-07 | Ignition coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7172031A JP2715403B2 (en) | 1995-07-07 | 1995-07-07 | Ignition coil |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63186814A Division JP2734540B2 (en) | 1988-07-28 | 1988-07-28 | Ignition coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0845753A true JPH0845753A (en) | 1996-02-16 |
| JP2715403B2 JP2715403B2 (en) | 1998-02-18 |
Family
ID=15934253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7172031A Expired - Lifetime JP2715403B2 (en) | 1995-07-07 | 1995-07-07 | Ignition coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2715403B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006093405A (en) * | 2004-09-24 | 2006-04-06 | Matsushita Electric Works Ltd | High-voltage generator and head light lighting device |
| JP2006287090A (en) * | 2005-04-04 | 2006-10-19 | Hanshin Electric Co Ltd | Ignition coil for internal combustion engine |
| JP2007066961A (en) * | 2005-08-29 | 2007-03-15 | Hitachi Ltd | Ignition coil for internal combustion engine |
| JP2015201555A (en) * | 2014-04-09 | 2015-11-12 | 株式会社デンソー | Magnetic circuit for ignition coil, and ignition coil device |
| US10041463B2 (en) | 2014-04-10 | 2018-08-07 | Denso Corporation | Ignition device |
| JP2021125664A (en) * | 2020-02-10 | 2021-08-30 | 株式会社デンソー | Ignition coil |
| US11830667B2 (en) | 2019-08-22 | 2023-11-28 | Denso Corporation | Ignition coil |
-
1995
- 1995-07-07 JP JP7172031A patent/JP2715403B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006093405A (en) * | 2004-09-24 | 2006-04-06 | Matsushita Electric Works Ltd | High-voltage generator and head light lighting device |
| JP2006287090A (en) * | 2005-04-04 | 2006-10-19 | Hanshin Electric Co Ltd | Ignition coil for internal combustion engine |
| JP2007066961A (en) * | 2005-08-29 | 2007-03-15 | Hitachi Ltd | Ignition coil for internal combustion engine |
| JP2015201555A (en) * | 2014-04-09 | 2015-11-12 | 株式会社デンソー | Magnetic circuit for ignition coil, and ignition coil device |
| US10041463B2 (en) | 2014-04-10 | 2018-08-07 | Denso Corporation | Ignition device |
| US11830667B2 (en) | 2019-08-22 | 2023-11-28 | Denso Corporation | Ignition coil |
| JP2021125664A (en) * | 2020-02-10 | 2021-08-30 | 株式会社デンソー | Ignition coil |
| US11538627B2 (en) | 2020-02-10 | 2022-12-27 | Denso Corporation | Ignition coil |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2715403B2 (en) | 1998-02-18 |
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