JPH0638357B2 - Constant voltage discharge tube for ignition device of internal combustion engine - Google Patents
Constant voltage discharge tube for ignition device of internal combustion engineInfo
- Publication number
- JPH0638357B2 JPH0638357B2 JP24302388A JP24302388A JPH0638357B2 JP H0638357 B2 JPH0638357 B2 JP H0638357B2 JP 24302388 A JP24302388 A JP 24302388A JP 24302388 A JP24302388 A JP 24302388A JP H0638357 B2 JPH0638357 B2 JP H0638357B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- hollow cylindrical
- cylindrical envelope
- discharge tube
- sealing
- 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
Links
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
- Spark Plugs (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、内燃機関の点火装置における点火プラグと直
列に接続されて使用される底電圧放電管に関するもので
ある。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom voltage discharge tube used by being connected in series with a spark plug in an ignition device for an internal combustion engine.
従来の技術 内燃機関の点火装置における点火プラグの絶縁磁器体表
面に、カーボンや鉛化合物等が付着することにより、必
要な電圧が点火プラグ電極のところで得られなくなるこ
とを防止するために、点火プラグと点火コイルとの間に
放電管を設けることがすでに知られており、その放電管
が特開昭50-139237号公報に示されている。2. Description of the Related Art A spark plug in an internal combustion engine ignition device is provided in order to prevent carbon or lead compounds from adhering to the surface of the insulating ceramic body of the spark plug, thereby preventing a necessary voltage from being obtained at the spark plug electrode. It is already known to provide a discharge tube between the ignition coil and the ignition coil, and the discharge tube is disclosed in Japanese Patent Application Laid-Open No. 50-139237.
これは、第５図に示すようにセラミックの筒状絶縁体９
の両端をコップ状の金属電極１０，１１で封止し、筒状
絶縁体の内部１２を不活性ガスで充填して構成されてい
る。This is a ceramic cylindrical insulator 9 as shown in FIG.
Both ends are sealed with cup-shaped metal electrodes 10 and 11, and the inside 12 of the cylindrical insulator is filled with an inert gas.
発明が解決しようとする課題 内燃機関の点火装置に使用される放電管には、機械的強
度が要求され、中でもその金属電極とセラミック絶縁体
との封着強度については特に強く要求される。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention A discharge tube used for an ignition device of an internal combustion engine is required to have a high mechanical strength, and particularly to a sealing strength between a metal electrode and a ceramic insulator thereof.
従来の放電管の金属電極によるセラミック絶縁体への封
着については、上記公報には具体的に述べられていない
が、封着ガラスを介して封着するかまたはセラミック絶
縁体の表面にメタライジング技術により金属層を形成
し、この金属層と金属電極の付着部分をろう材を介して
接合するのが、一般的である。The conventional sealing of the discharge tube to the ceramic insulator by the metal electrode is not specifically described in the above publication, but it is sealed through a sealing glass or metalized on the surface of the ceramic insulator. Generally, a metal layer is formed by a technique, and this metal layer and a portion where the metal electrode is attached are joined together through a brazing material.
上記従来品は、金属電極とセラミック絶縁体との封着を
このような方法でなされている推測されるが、その封着
部分をみると、金属電極の封着面は片側面部１３だけで
あり、偶発的な衝撃や、長期にわたる連続的もしくは断
続的な機械的振動に対して十分な封着強度を有している
とはいえず、封着部にクラックを生じ、最悪を場合には
不活性ガスのリークにより使用できなくなる。In the above conventional product, it is presumed that the metal electrode and the ceramic insulator are sealed by such a method. Looking at the sealed portion, the sealing surface of the metal electrode is only one side surface portion 13. However, it cannot be said that it has sufficient sealing strength against accidental impact or continuous or intermittent mechanical vibration for a long period of time. It cannot be used due to active gas leak.
本発明はかかる問題を改善するためになされたもので、
封着強度が高く、偶発的に加わる衝撃や、長期にわたる
連続的もしくは断続的な機械的振動に対して十分に耐え
ることができ、安定して使用しうる点火装置用定電圧放
電管を提供するものである。The present invention has been made to improve such problems.
(EN) A constant voltage discharge tube for an ignition device, which has a high sealing strength and can sufficiently withstand accidental shock and long-term continuous or intermittent mechanical vibration, and can be used stably. It is a thing.
課題を解決するための手段 本発明の点火装置用電圧放電管は、セラミック等の絶縁
材の中空円筒外囲器の両端開口部周縁に溝部を設け、底
部に主電極を取り付けた金属封塞体の側壁部を嵌挿し、
前記溝部と前記側壁部の内外面とを封着ガラスを介して
接合することにより、金属封塞体を中空円筒外囲器に封
着しているものである。Means for Solving the Problems A voltage discharge tube for an ignition device of the present invention is a metal sealing body in which a groove portion is provided in the peripheral edge of both ends of a hollow cylindrical envelope of an insulating material such as ceramic, and a main electrode is attached to the bottom portion. Insert the side wall of
By bonding the groove and the inner and outer surfaces of the side wall via a sealing glass, the metal enclosure is sealed in the hollow cylindrical envelope.
作 用 本発明の定電圧放電管においては、金属封塞体の内外面
と中空円筒外囲器の溝部とを封着ガラスを用いて封着し
たので、従来の放電管のように金属電極の片面部だけで
の封着に比べて封着強度がいちじるしく高くなり、した
がって機械的振動，衝撃に対して強く、安定している。In the constant voltage discharge tube of the present invention, the inner and outer surfaces of the metal sealing body and the groove of the hollow cylindrical envelope are sealed with the sealing glass. The sealing strength is remarkably higher than that of sealing on only one side, and therefore it is strong and stable against mechanical vibration and impact.
実施例 以下、本発明の点火装置用定電圧放電管の一実施例につ
いて、図面を用いて説明する。Example An example of a constant voltage discharge tube for an ignition device of the present invention will be described below with reference to the drawings.
第１図は本実施例の断面図である。FIG. 1 is a sectional view of this embodiment.
図において、１は中空円筒外囲器で、たとえばセラミッ
クの絶縁材で構成され、第２図(イ)に示すように溝部８
を両端開口部周縁に有している。２，３は金属封塞体
で、たとえばコバールの金属材料よりなり、第２図(ロ)
に示すように有底形状をしている。４は金属封塞体２，
３を中空円筒外囲器１の溝部８に溶着する封着ガラス、
５は主電極で、タングステン，タンタルもしくはモリブ
デン等の金属粉末をプレスし焼結した焼結体を金属棒に
取り付け、金属封塞体２の底部に溶着したものである。
６は主電極で、タングステン，タンタルもしくはモリブ
デン等の材料よりなり、金属封塞体３に溶着されてい
る。７は中空部で、アルゴン，ネオン，窒素ならびにキ
セノン等のいずれか一種または適宜数種を混合して必要
な放電開始電圧を得るための圧力とした不活性ガスが封
入されている。In the figure, reference numeral 1 denotes a hollow cylindrical envelope, which is made of, for example, a ceramic insulating material and has a groove portion 8 as shown in FIG.
At both ends of the opening. 2 and 3 are metal sealing bodies made of, for example, a Kovar metal material, and are shown in FIG.
It has a bottomed shape as shown in. 4 is a metal enclosure 2
Sealing glass for welding 3 to the groove portion 8 of the hollow cylindrical envelope 1;
Reference numeral 5 denotes a main electrode, which is obtained by pressing a metal powder of tungsten, tantalum, molybdenum, or the like and sintering it, attaching a sintered body to a metal rod, and welding it to the bottom of the metal sealing body 2.
A main electrode 6 is made of a material such as tungsten, tantalum or molybdenum, and is welded to the metal sealing body 3. Reference numeral 7 denotes a hollow portion, which is filled with an inert gas having a pressure for obtaining a required discharge starting voltage by mixing any one kind of argon, neon, nitrogen, xenon and the like or an appropriate number of kinds.
本実施例は次のようにして作製される。This example is manufactured as follows.
まず、たとえばセラミック材料の粉末をプレス成型し、
これを焼成して、第２図(イ)に示すように不活性ガスが
封入される中空部７と管両端の周縁部に溝部８を有する
中空円筒外囲器１とする。First, for example, press molding a powder of ceramic material,
This is fired to form a hollow cylindrical envelope 1 having a hollow portion 7 in which an inert gas is enclosed and groove portions 8 at the peripheral edges of both ends of the tube as shown in FIG.
次に、この中空円筒外囲器１の溝部８に、第３図(イ)に
示すように、熱膨張係数が中空円筒外囲器１のそれとほ
ぼ等しいガラスフリットを塗布し、大気中または窒素雰
囲気中で加熱溶融させて、あらかじめ封着ガラス４を溶
着しておく。Next, as shown in FIG. 3 (a), a glass frit having a thermal expansion coefficient substantially equal to that of the hollow cylindrical envelope 1 is applied to the groove portion 8 of the hollow cylindrical envelope 1 in the atmosphere or nitrogen. The sealing glass 4 is welded in advance by heating and melting in an atmosphere.
他方、金属封塞体２，３にも熱膨張係数がそれらとほぼ
等しいガラスフリットを塗布し、前述と同様にして第３
図(ロ)に示すように封着ガラス４をあらかじめ溶着さ
せ、主電極５，６をこの金属封塞体２，３の底部に第１
図に示すようにそれぞれ溶着させる。On the other hand, a glass frit having a thermal expansion coefficient substantially equal to those of the metal sealing bodies 2 and 3 is applied to the metal sealing bodies 2 and 3.
As shown in the figure (b), the sealing glass 4 is welded in advance, and the main electrodes 5 and 6 are firstly attached to the bottoms of the metal sealing bodies 2 and 3.
Weld each as shown.
なお、中空円筒外囲器１および金属封塞体２，３の封着
ガラスは、熱膨張係数がそれぞれ互いに近似していなけ
ればならないことから、中空円筒外囲器１と金属封塞体
２，３とはその熱膨張係数がほぼ実質的に等しいものが
使用される。Since the sealing glass of the hollow cylinder envelope 1 and the metal sealing bodies 2 and 3 must have thermal expansion coefficients close to each other, the hollow cylinder envelope 1 and the metal sealing bodies 2 and 3 are sealed. A material having a coefficient of thermal expansion substantially equal to 3 is used.
次いで、金属封塞体のいずれか一方、たとえば金属封塞
体３を主電極６が中空部７に向くように中空円筒外囲器
１の溝部８に上方から載置し、これを窒素ガス中または
不活性ガス雰囲気中で加熱して、溝部８および金属封塞
体３の封着ガラスを再度溶融させ、金属封塞体３の重み
でその側壁部先端が溝部８の底部に当接するまで加熱を
続けて、第１図に示すように、金属封塞体３を中空円筒
外囲器１に溝部８のところで封着ガラス４により溶着さ
せる。Next, one of the metal sealing bodies, for example, the metal sealing body 3 is placed from above in the groove portion 8 of the hollow cylindrical envelope 1 so that the main electrode 6 faces the hollow portion 7, and this is placed in nitrogen gas. Alternatively, the groove 8 and the sealing glass of the metal sealing body 3 are melted again by heating in an inert gas atmosphere, and the weight of the metal sealing body 3 heats until the tip of the side wall of the metal sealing body 3 contacts the bottom of the groove 8. Then, as shown in FIG. 1, the metal sealing body 3 is welded to the hollow cylindrical envelope 1 at the groove portion 8 by the sealing glass 4.
しかる後、金属封塞体２を溝部８に載置した中空円筒外
囲器１を密閉容器内に載置し、密閉容器内を排気すると
ともに中空円筒外囲器の中空部７をも排気した後、アル
ゴン，ネオン，窒素ならびにキセノン等の一種もしくは
それを混合した不活性ガスを所定圧力で封入し、最後に
密閉容器の外部より高周波加熱装置で金属封塞体２の近
傍を加熱して、金属封塞体２および中空円筒外囲器１の
溝部８にあらかじめ溶着しておいた封着ガラスを溶融さ
せ、第１図に示すように封着ガラス４で金属封塞体２を
中空円筒外囲器１に封着して、第４図に示すように完成
する。Then, the hollow cylindrical envelope 1 having the metal enclosure 2 placed in the groove 8 is placed in the closed container, the inside of the closed container is exhausted, and the hollow portion 7 of the hollow cylindrical envelope is also exhausted. After that, one kind of argon, neon, nitrogen, xenon or the like or an inert gas mixed with them is sealed at a predetermined pressure, and finally the vicinity of the metal enclosure 2 is heated from the outside of the closed container by a high frequency heating device, The metal sealing body 2 and the sealing glass previously welded to the groove portion 8 of the hollow cylinder envelope 1 are melted, and the metal sealing body 2 is separated from the hollow cylinder by the sealing glass 4 as shown in FIG. It is sealed to the envelope 1 and completed as shown in FIG.
なお、この排気，不活性ガス封入については、たとえば
特開昭63-175315号公報にも示されるように公知の方法
によればよいが、金属封塞体の封着については、これに
よらずに、たとえばレーザ光を照射するなどして行って
もよい。It should be noted that the exhaust and the inert gas encapsulation may be performed by a known method as disclosed in, for example, Japanese Patent Application Laid-Open No. 63-175315, but the sealing of the metal enclosure is not performed by this method. Alternatively, for example, laser light may be irradiated.
また、本実施例においては、ガラスフリットを塗布，加
熱して、封着ガラスをあらかじめ金属封塞体２，３およ
び中空円筒外囲器１の溝部８に形成したが、ガラスフリ
ットを塗布した金属封塞体を中空円筒外囲器に封着する
ときには加熱し溶融して溶着してもよい。Further, in this embodiment, the glass frit is applied and heated to form the sealing glass in advance in the metal sealing bodies 2 and 3 and the groove portion 8 of the hollow cylindrical envelope 1. However, the glass frit is applied to the metal. When the sealing body is sealed to the hollow cylindrical envelope, it may be heated, melted and welded.
さらに、金属封塞体の側壁部先端を溝部の底部に当接さ
せなくとも、封着ガラスで金属封塞体の側壁部内外面と
中空円筒外囲器の溝部とが溶着していれば十分である。Further, even if the tip of the side wall of the metal enclosure is not brought into contact with the bottom of the groove, it is sufficient if the inner and outer surfaces of the side wall of the metal enclosure and the groove of the hollow cylindrical envelope are welded with the sealing glass. is there.
本実施例の点火装置用定電圧放電管の封着強度を確認す
るために、金属封塞体を片側だけ封着ガラスで中空円筒
外囲器に封着して、空間部のもう一方の空いた箇所から
水を注入し水圧を加えて、金属封塞体が剥離するときの
圧力を測ったところ、１００kg／cm2程度以上の圧力が
必要であった。これに対して、金属封塞体の側壁部内側
面だけを中空円筒外囲器の溝部に封着した冒頭に述べた
従来技術の方法で金属封塞体の一方だけを中空円筒外囲
器に封着し、同様に水圧を加えて金属封塞体の剥離する
水圧を測ったところ、わずか２０kg／cm2程度の圧力で
金属封塞体が剥離した。In order to confirm the sealing strength of the constant voltage discharge tube for the ignition device of the present embodiment, the metal sealing body is sealed to the hollow cylindrical envelope with the sealing glass only on one side, and the other side of the space is vacant. When water was injected from different points and water pressure was applied to measure the pressure when the metal sealing body peeled off, a pressure of about 100 kg / cm 2 or more was required. On the other hand, by sealing only the inner surface of the side wall of the metal enclosure in the groove of the hollow cylindrical envelope, only one side of the metal enclosure is sealed in the hollow cylindrical envelope by the method of the prior art described at the beginning. Water pressure was applied in the same manner and the water pressure for peeling off the metal sealing body was measured. As a result, the metal sealing body was peeled off with a pressure of only about 20 kg / cm 2 .
発明の効果 このように、本発明の点火装置用定電圧放電管は、金属
封塞体の側壁部内外面と中空円筒外囲器の溝部との間を
封着ガラスを介在させて封着したので、金属封塞体の封
着強度がいちじるしく大きく、機械的衝撃，振動に対し
て強いものにすることができる。As described above, in the constant voltage discharge tube for an ignition device of the present invention, since the sealing glass is interposed between the inner and outer surfaces of the side wall of the metal sealing body and the groove of the hollow cylindrical envelope, the sealing is performed. The sealing strength of the metal sealing body is extremely large, and it can be made strong against mechanical shock and vibration.
第１図は本発明の内燃機関の点火装置用定電圧放電管の
一実施例の断面図、第２図(イ)は一部切断した中空円筒
外囲器の斜視図、第２図(ロ)は金属封塞体の斜視図、第
３図(イ)は溝部に封着ガラスを溶着した中空円筒外囲器
の一部切断した断面図、第３図(ロ)は封着ガラスを溶着
した金属封塞体の断面図、第４図は点火装置用定電圧放
電管の完成斜視図、第５図は従来の点火装置用定電圧放
電管の断面図である。 １……中空円筒外囲器、２，３……金属封塞体、４……
封着ガラス、５，６……主電極、７……中空部、８……
溝部1 is a sectional view of an embodiment of a constant voltage discharge tube for an ignition device of an internal combustion engine of the present invention, FIG. 2 (a) is a perspective view of a partially cut hollow cylindrical envelope, and FIG. ) Is a perspective view of the metal sealing body, FIG. 3 (a) is a partially cut sectional view of the hollow cylindrical envelope in which the sealing glass is welded in the groove, and FIG. 3 (b) is the sealing glass. FIG. 4 is a cross-sectional view of the metal sealing body, FIG. 4 is a perspective view of a completed constant voltage discharge tube for an ignition device, and FIG. 5 is a cross-sectional view of a conventional constant voltage discharge tube for an ignition device. 1 ... Hollow cylindrical envelope, 2, 3 ... Metal enclosure, 4 ...
Sealing glass, 5, 6 ... Main electrode, 7 ... Hollow part, 8 ...
Groove
Claims (1)
を有した中空円筒外囲器と、前記中空円筒外囲器の両端
開口部の周縁部に設けられた溝部と、片側が開口した有
底形状で側壁部分が前記溝部に嵌挿され前記中空円筒外
囲器の前記両端開口部を封塞する金属封塞体と、前記金
属封塞体の底部に取りつけられる主電極と、前記溝部分
で前記金属封塞体を前記中空円筒外囲器に溶着させる封
着ガラスと、前記中空部に封入される不活性ガスとから
なる内燃機関の点火装置用定電圧放電管。1. A hollow cylindrical envelope having a hollow portion, which is made of an insulating material such as ceramics, a groove portion provided at a peripheral edge portion of the opening portions at both ends of the hollow cylindrical envelope, and an opening on one side. A metal sealing body having a bottom shape, the side wall portion of which is fitted into the groove portion to seal the opening portions at both ends of the hollow cylindrical envelope, a main electrode attached to the bottom portion of the metal sealing body, and the groove portion. 2. A constant voltage discharge tube for an ignition device of an internal combustion engine, which comprises a sealing glass for welding the metal sealing body to the hollow cylindrical envelope, and an inert gas sealed in the hollow portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24302388A JPH0638357B2 (en) | 1988-09-28 | 1988-09-28 | Constant voltage discharge tube for ignition device of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24302388A JPH0638357B2 (en) | 1988-09-28 | 1988-09-28 | Constant voltage discharge tube for ignition device of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0294278A JPH0294278A (en) | 1990-04-05 |
| JPH0638357B2 true JPH0638357B2 (en) | 1994-05-18 |
Family
ID=17097721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24302388A Expired - Fee Related JPH0638357B2 (en) | 1988-09-28 | 1988-09-28 | Constant voltage discharge tube for ignition device of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0638357B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04349386A (en) * | 1991-05-27 | 1992-12-03 | West Electric Co Ltd | Voltage stabilizing tube for internal combustion engine ignition device |
-
1988
- 1988-09-28 JP JP24302388A patent/JPH0638357B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0294278A (en) | 1990-04-05 |
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