JPH02264159A - Coil ignition device for internal combustion engine - Google Patents
Coil ignition device for internal combustion engineInfo
- Publication number
- JPH02264159A JPH02264159A JP8408689A JP8408689A JPH02264159A JP H02264159 A JPH02264159 A JP H02264159A JP 8408689 A JP8408689 A JP 8408689A JP 8408689 A JP8408689 A JP 8408689A JP H02264159 A JPH02264159 A JP H02264159A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- diameter
- container
- voltage
- distance
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 9
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- -1 Cannon Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- BROHICCPQMHYFY-UHFFFAOYSA-N caesium chromate Chemical compound [Cs+].[Cs+].[O-][Cr]([O-])(=O)=O BROHICCPQMHYFY-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は内燃機関用コイル点火装置に係り、特に、点火
プラグの直前の高電圧導線中に接続されるか、または点
火プラグ自体に組込まれる火花間隙素子の改良に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION ``Industrial Application Field'' The present invention relates to a coil ignition device for an internal combustion engine, in particular a coil ignition device that is connected in a high-voltage conductor immediately in front of a spark plug or integrated into the spark plug itself. This invention relates to improvements in spark gap elements.
「従来の技術ｊ
一般に、コイル点火装置における点火プラグへの印加電
圧は、プラグ電極の点火電圧に達するまでに、比較的徐
々にしか」二昇しない。プラグが汚れると、すなわちプ
ラグ電極を互いに絶縁する磁器体が媒や釦の残渣からな
る層で覆われていたり、湿っていたり、油で汚れている
と、点火プラグ電極に対してその時存在する電気的分路
を介して、電圧上昇中多くのエネルギが流失して必要な
点火電圧がもはや得られなくなる。BACKGROUND OF THE INVENTION In general, the voltage applied to a spark plug in a coil ignition device increases only relatively gradually until it reaches the ignition voltage of the plug electrode. If the plug is dirty, that is, if the porcelain body that insulates the plug electrodes from each other is covered with a layer of media or button residue, is damp, or is contaminated with oil, the current present against the spark plug electrodes will be reduced. During the voltage rise, much energy is dissipated via the target shunt and the required ignition voltage is no longer available.
そこで、点火プラグの前に直列に火花間隙素子を組込む
ことにより、直列の火花間隙素子の点火電圧が充分高く
保たれ、フラッシュオーバ後、この電圧がほとんど全部
プラグ電極へ印加されると、点火プラグへの印加電圧が
急峻に上昇し、これにより点火エネルギは分路抵抗があ
っても、これに流れずコイル点火装置の分路の影響を著
しく少なくすることができる。Therefore, by incorporating a spark gap element in series in front of the spark plug, the ignition voltage of the series spark gap element is kept high enough, and after flashover, when almost all of this voltage is applied to the plug electrode, the spark plug The voltage applied to the coil ignition device rises sharply, so that even if there is a shunt resistance, the ignition energy does not flow into it, and the influence of the shunt on the coil ignition device can be significantly reduced.
この火花間隙素子には点火電圧が充分安定で、また点火
周波数（０，１〜１００Ｈｚ）に左右されない（許容範
囲２０±２ＫＶ以内）ような特性が要求される。This spark gap element is required to have characteristics such that the ignition voltage is sufficiently stable and is not affected by the ignition frequency (0.1 to 100 Hz) (within a tolerance range of 20±2 KV).
この特性の要求に対する対策が特公昭５１−３２１８０
号公報に種々述べられている。すなわち、高電圧導線中
に接続された直列火花間隙が、その飛散の少ない電極端
部間に１ないし５ｍｍなるべく１．５ないし３ｍｍの間
隔を持っており、８ないし３０ＫＶの所定の点火電圧平
均値に応動し、この直列火花間隙が、電極と化学的に反
応しないガスを満たされた閉鎖放電空間内にある点火装
置において、直列火花間隙の放電空間内のガスが、少な
くとも９８％の純度を持つ窒素あるいは（および）少な
くとも９９％の純度を持つアルゴンからなり、５Ｘ１０
−３％以下の水、酸素およびハロゲンのような不純物し
か含まず、このガスの圧力が１ないし１０気圧なるべく
２ないし５気圧であり、火花フラッシュオーバの範囲に
ある直列火花間隙の電極が、９０重量％以上、金属Ａ
Ｑ 、 Ｃｅ 、 Ｈｆ 、 Ｌ ａ 、 Ｎ ｂ 。A countermeasure for this characteristic requirement was published in the Japanese Patent Publication No. 51-32180.
There are various descriptions in the publication. That is, the series spark gap connected in the high voltage conductor has a spacing of 1 to 5 mm, preferably 1.5 to 3 mm, between its low-splatter electrode ends, and a predetermined average value of the ignition voltage of 8 to 30 KV. In an ignition system in which the series spark gap is in a closed discharge space filled with a gas that does not chemically react with the electrodes, the gas in the discharge space of the series spark gap has a purity of at least 98%. consisting of nitrogen or (and) argon with a purity of at least 99%, 5X10
- an electrode with a series spark gap containing less than 3% of impurities such as water, oxygen and halogens, with a pressure of 1 to 10 atm, preferably 2 to 5 atm, and in the range of spark flashover; Weight% or more, metal A
Q, Ce, Hf, La, Nb.
Ｔａ、Ｔｊ、、ＶおよびＺｒの１つの窒化物かあるいは
これら金属の窒化物の混合物からなり、化合物の２５原
子％以下の酸素含有量に相当する酸化物あるいは酸化窒
化物を含有していることが述べられている。Consists of one nitride of Ta, Tj, V, and Zr, or a mixture of nitrides of these metals, and contains an oxide or oxynitride corresponding to an oxygen content of 25 at % or less of the compound. is stated.
「発明が解決しようとする課題」
この従来の方法では、上記特性、すなわち点火電圧が充
分安定で、点火周波数に左右されないような特性を満足
するようなものが得られなかった。``Problems to be Solved by the Invention'' This conventional method has not been able to provide a product that satisfies the above characteristics, that is, the ignition voltage is sufficiently stable and is not affected by the ignition frequency.
本発明は、上記特性を満足するものを得ることを目的と
するものである。The object of the present invention is to obtain a device that satisfies the above characteristics.
「課題を解決するための手段」
本発明は、高電圧導線中に、電極と化学的に反応しない
ガスを充填した絶縁物密閉容器内に１対の電極を対向し
てなる火花間隙素子を直列に挿入してなる内燃機関用コ
イル点火装置において、前記１．対の電極端部間距離を
ａ、１対の電極の基部から絶縁物密閉容器の内壁を経た
沿面距離をｂ、電極の基部の直径をｄ、絶縁物密閉容器
の内周径をＤとしたとき、
≧３．５
であって、かつ
−ｄ
〉 １
の条件を満足するような火花間隙素子を具備してな゛る
ものである。"Means for Solving the Problems" The present invention provides a spark gap element formed by a pair of electrodes facing each other in a high-voltage conducting wire in a sealed insulating container filled with a gas that does not chemically react with the electrodes. A coil ignition device for an internal combustion engine, which is inserted into a coil ignition device according to 1. The distance between the ends of the pair of electrodes is a, the creepage distance from the base of the pair of electrodes through the inner wall of the insulating sealed container is b, the diameter of the base of the electrode is d, and the inner diameter of the insulating sealed container is D. ≧3.5 and -d>1.
「作用」
時に、容器の内壁の直径りと電極基部直径ｄとの差Ｄ−
ｄが電極間隙ａより大きいため、点火電圧は安定し、か
つ沿面放電を起こすこともない。At the time of "action", the difference D- between the diameter of the inner wall of the container and the diameter d of the electrode base
Since d is larger than the electrode gap a, the ignition voltage is stable and no creeping discharge occurs.
「実施例」 以下、本発明の一実施例を図面に基き説明する。"Example" Hereinafter, one embodiment of the present invention will be described based on the drawings.
一
第１図は火花間隙素子（６）を示し、絶縁性の密閉容器
（１）内の両端面（５）（５）の略中央から内方に突出
して１対の電極（２） （３）を対向して設け、内部に
前記電極（２） （３）と化学的に反応しないガスが充
填されている。前記密閉容器（１）は長さ］、８ｍｍ、
外径１５．５ｍｍ、内径１１ 、５ｍｍ、厚さ２ｍｍの
アルミナセラミック円筒体（４）を、両端面（５） （
５）で密閉して構成されている。前記電極（２） （３
）は直径３ｍｍ、長さ７ｍｍで、前記両端（５）（５）
の略中央から内方に突出し、外方端は外部に露出してい
る。このうち、陰極側の電極（２）は先端が丸味を有す
るかまたは平坦な形状をなし、また、その材質は、多孔
質タングステン基体中に、易電子放射物質として、クロ
ム酸セシウム（Ｃｓ ２Ｃｒ Ｏ４）、アルミン酸アル
カリ土類（Ｂ ａ Ｏ−Ｃａ Ｏ−Ａ Ｑ ｚ Ｏ３）
が含有されている。陽極側の電極（３）は先端が１２０
度以下の角度（０）をもった円錐形をなし、タングステ
ンまたはニッケルよりなる。これらの電極（２） （３
）の先端部の間隙（ａ）は、３〜５ｍｍ、具体的には４
ｍｍであり、また充填されたガスは、１０〜２０気圧の
圧力のががったアルゴン、クリプ１〜ン、キャノンまた
はこれらの混合物、具体的には１２気圧のアルゴンガス
とする。Figure 1 shows a spark gap element (6), which has a pair of electrodes (2) (3 ) are provided facing each other, and the inside is filled with a gas that does not chemically react with the electrodes (2) and (3). The airtight container (1) has a length], 8 mm,
An alumina ceramic cylinder (4) with an outer diameter of 15.5 mm, an inner diameter of 11.5 mm, and a thickness of 2 mm is attached to both end surfaces (5) (
5) is constructed in a sealed manner. Said electrode (2) (3
) has a diameter of 3 mm and a length of 7 mm, and both ends (5) (5)
It protrudes inward from approximately the center, and the outer end is exposed to the outside. Among these, the cathode side electrode (2) has a rounded or flat tip, and its material is cesium chromate (Cs 2Cr O4 as an electron-emitting substance) in a porous tungsten base. ), alkaline earth aluminate (B a O-Ca O-A Q z O3)
Contains. The tip of the anode side electrode (3) is 120 mm.
It has a conical shape with an angle of less than 0 degrees and is made of tungsten or nickel. These electrodes (2) (3
) is 3 to 5 mm, specifically 4 mm.
mm, and the gas filled is argon, Krypton, Cannon, or a mixture thereof at a pressure of 10 to 20 atm, specifically argon gas at 12 atm.
ここで、前記電極（２） （３）間の先端部間隙をａ、
電極（２） （３）の基部から容器（１）の内壁に沿っ
た距離をｂ、電極（２） （３）の基部の直径をｄ、容
器（１）の内周径をＤとすると、
≧ ３．５ ・・・・ （１）
であって、かつ
−ｄ
〉 １−・・・・（２）
であるような構成とする。すなわち、（１）式からが充
分に大きいことが本発明の目的を達成するために必要で
あるが、Ｄ−ｄがａに比べである一定値以上でないと、
容易に沿面放電をおこすことが判明している。したがっ
て、（１）式と（２）式を同時に満足することが本発明
では必須である。Here, the tip gap between the electrodes (2) and (3) is a,
If the distance from the base of electrodes (2) (3) along the inner wall of container (1) is b, the diameter of the base of electrodes (2) (3) is d, and the inner diameter of container (1) is D, then The configuration is such that ≧ 3.5 (1) and -d > 1- (2). That is, it is necessary to achieve the object of the present invention that the value from equation (1) is sufficiently large, but if D−d is not greater than a certain value compared to a,
It has been found that creeping discharge can easily occur. Therefore, it is essential in the present invention to simultaneously satisfy equations (1) and (2).
なお、電極（２） （３）の基部直径ｄは第２図のよう
に、電極（２） （３）自身の直径より大きい場合、そ
の大きい方の値が用いられる。In addition, when the base diameter d of the electrodes (2) (3) is larger than the diameter of the electrodes (2) (3) themselves as shown in FIG. 2, the larger value is used.
以上のように構成された火花間隙素子（６）は第３図に
示すような内燃機関用コイル点火装置（７）に組込まれ
る。すなわち、絶縁体のプラグキャップ（８）の内部に
は接触片を併用した導電性のばね（９）が設けられ、こ
のばね（９）に、前記火花間隙素子（６）が、その陰極
側電極（２）を接触するようにして嵌合し、他方の陽極
側電極（３）にも同様のばね（１０）が接触されている
。そして、前記プラグキャップ（８）の下方より点火プ
ラグ（１］）を嵌合すると、この点火プラグ（１１）の
接触突部（１２）が前記ばね（１０）を介して火花間隙
素子（６）と直列に接続される。The spark gap element (6) configured as described above is incorporated into a coil ignition device (7) for an internal combustion engine as shown in FIG. That is, a conductive spring (9) combined with a contact piece is provided inside the insulator plug cap (8), and the spark gap element (6) is connected to the cathode side electrode of the spring (9). (2) are fitted so as to be in contact with each other, and a similar spring (10) is also in contact with the other anode side electrode (3). When the spark plug (1]) is fitted from below the plug cap (8), the contact protrusion (12) of the spark plug (11) connects to the spark gap element (6) via the spring (10). connected in series with
また、前記プラグキャップ（８）の上端には外部アース
体からの影響を防ぐための絶縁ゴムキャップ（１３）が
かぶせられ、高圧ケーブル（１４）を介して点火コイル
（図示せず）へ接続される。Further, the upper end of the plug cap (8) is covered with an insulating rubber cap (13) to prevent influence from an external ground body, and is connected to an ignition coil (not shown) via a high voltage cable (14). Ru.
なお、電極（Ｘ）基部の径ｄは３ｍｍとしたが、小さい
程よい。Although the diameter d of the base of the electrode (X) was set to 3 mm, the smaller the diameter, the better.
また、容器（１）の厚さは２ｍｍとしたがこれも強度の
許される範囲で薄い方がよい。Further, although the thickness of the container (1) was set to 2 mm, it is better to be as thin as possible within the strength range.
また、容器（１）はアルミナセラミック以外のステアタ
イト、フォルステライトなどのセラミックであってもよ
い。Moreover, the container (1) may be made of ceramics other than alumina ceramics, such as steatite and forsterite.
「発明の効果」
第４図は理想的な放電特性図を示すもので、縦軸が電極
（２） （３）間の印加電圧（Ｖ）、横軸が時間（Ｔ）
をあられす。この図から、充分高い点火電圧をより安定
して供給するためには、放電開始電圧（Ｖａ）を２０±
２ＫＶ以内に保たなければならないこと、また、放電開
始後の点火電圧エネルギを充分に放電エネルギに変換す
るためには放電維持電圧（ｖｂ）を３００Ｖ以内におさ
えなければならないことがわかる。"Effects of the Invention" Figure 4 shows an ideal discharge characteristic diagram, where the vertical axis is the applied voltage (V) between the electrodes (2) and (3), and the horizontal axis is the time (T).
Hail. From this figure, in order to supply a sufficiently high ignition voltage more stably, the discharge starting voltage (Va) must be set at 20±
It can be seen that the discharge sustaining voltage (vb) must be kept within 300V in order to sufficiently convert the ignition voltage energy after the start of discharge into discharge energy.
しかるに、本発明では電極間隙と容器の形状を上述のよ
うに構成したので、電極間の静電容量が０．３ｐＦ以下
となり、高安定性が得られた。ちなみに、従来は第５図
の放電開始電圧特性線（Ｘ）に示すように、充分な放電
開始電圧が得られないばかりか、放電周期（周波数）が
増すにつれて減じてくる。これに対し、本発明では特性
線（Ｙ）に示すように、放電周期が０．１〜１００ Ｈ
ｚのいずれの周期でも２０±２ＫＶ以内であることがわ
かる。However, in the present invention, since the electrode gap and the shape of the container were configured as described above, the capacitance between the electrodes was 0.3 pF or less, and high stability was obtained. Incidentally, conventionally, as shown in the discharge starting voltage characteristic line (X) in FIG. 5, not only is it not possible to obtain a sufficient discharge starting voltage, but it also decreases as the discharge period (frequency) increases. In contrast, in the present invention, as shown in the characteristic line (Y), the discharge period is 0.1 to 100 H.
It can be seen that any period of z is within 20±2 KV.
第１図は本発明による火花間隙素子の一実施例を示す断
面図、第２図は他の実施例の断面図、第３図は内燃機関
用コイル点火装置に組込んだ状態の断面図、第４図は火
花間隙素子の電極間の放電特性図、第５図は放電開始電
圧の放電周期特性図である。
（１）・・・密閉容器、（２） （３）・電極、（４）
・・セラミック筒、（５）・・・端面、（６）・・・火
花間隙素子、（７）・・内燃機関用コイル点火装置、（
８）・・・プラグキャップ、（９）（１０）・・・ばね
、（１１）・・・点火プラグ、（１２）・・・接触突部
、（１３）・・・絶縁ゴムキャップ、（１４）・・高圧
ケーブル。
出願人 浜松ホトニクス株式会社
（△）
可
阜
屯皐犀゛学←FIG. 1 is a sectional view showing one embodiment of the spark gap element according to the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a sectional view of the spark gap element installed in a coil ignition device for an internal combustion engine. FIG. 4 is a discharge characteristic diagram between the electrodes of the spark gap element, and FIG. 5 is a discharge period characteristic diagram of the discharge starting voltage. (1)...Airtight container, (2) (3)・Electrode, (4)
... Ceramic cylinder, (5) ... End face, (6) ... Spark gap element, (7) ... Coil ignition device for internal combustion engine, (
8) Plug cap, (9) (10) Spring, (11) Spark plug, (12) Contact protrusion, (13) Insulating rubber cap, (14 )...High voltage cable. Applicant Hamamatsu Photonics Co., Ltd. (△) Kafutun University of Science←
Claims (2)
を充填した絶縁物密閉容器内に１対の電極を対向してな
る火花間隙素子を、直列に挿入してなる内燃機関用コイ
ル点火装置において、前記１対の電極端部間距離をａ、
１対の電極の基部から絶縁物密閉容器の内壁を経た沿面
距離をｂ、電極の基部の直径をｄ、絶縁物密閉容器の内
周径をＤとしたとき、 ｂ／ａ≧３．５ であって、かつ （Ｄ−ｄ）／ａ＞１ の条件を満足するような火花間隙素子を具備してなるこ
とを特徴とする内燃機関用コイル点火装置。(1) A coil for an internal combustion engine in which a spark gap element consisting of a pair of electrodes facing each other is inserted in series in a high-voltage conductor in a sealed insulating container filled with a gas that does not chemically react with the electrodes. In the ignition device, the distance between the ends of the pair of electrodes is a,
When the creepage distance from the base of a pair of electrodes to the inner wall of the insulating sealed container is b, the diameter of the electrode base is d, and the inner diameter of the insulating sealed container is D, b/a≧3.5. 1. A coil ignition device for an internal combustion engine, comprising a spark gap element that satisfies the condition (D-d)/a>1.
両端面略中央に電極を設けてなる請求項（１）記載の内
燃機関用コイル点火装置。(2) The coil ignition device for an internal combustion engine according to claim (1), wherein the closed container is made of a ceramic cylinder, and electrodes are provided approximately at the center of both end faces of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8408689A JPH02264159A (en) | 1989-04-04 | 1989-04-04 | Coil ignition device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8408689A JPH02264159A (en) | 1989-04-04 | 1989-04-04 | Coil ignition device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02264159A true JPH02264159A (en) | 1990-10-26 |
Family
ID=13820690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8408689A Pending JPH02264159A (en) | 1989-04-04 | 1989-04-04 | Coil ignition device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02264159A (en) |
-
1989
- 1989-04-04 JP JP8408689A patent/JPH02264159A/en active Pending
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