JPS60212985A - Ignition plug - Google Patents
Ignition plugInfo
- Publication number
- JPS60212985A JPS60212985A JP6922284A JP6922284A JPS60212985A JP S60212985 A JPS60212985 A JP S60212985A JP 6922284 A JP6922284 A JP 6922284A JP 6922284 A JP6922284 A JP 6922284A JP S60212985 A JPS60212985 A JP S60212985A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- tip
- center electrode
- ceramic
- noble metal
- 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
Landscapes
- Spark Plugs (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
本発明は中心電極の寿命を延長させ、耐久性ならびに着
火性能を向上させる構造をもつ点火プラグに関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spark plug having a structure that extends the life of the center electrode and improves durability and ignition performance.
一般に点火プラグの中心電極はその先端部が燃焼室内の
高温ガスに直接曝されるため、か＼る過酷な使用条件下
における化学的耐久性および火花放電に対する耐消耗性
の向上が強く要望されてお９、この目的に応する点火グ
２グとしては中心電極の先端に、あるいはこれに対向す
る接地電極面に貴金属チップを配設し電極の耐久性を向
上させるようにした点火ブックが知られているが、中心
電極をこのような構造としても高温の極めて過酷な使用
条件下における火花放電の繰返しによ部先端の貴金属チ
ップが溶融飛散を生じその消耗を防ぐことは極めて困難
であった。Generally, the tip of the center electrode of a spark plug is directly exposed to the high-temperature gas in the combustion chamber, so there is a strong demand for improved chemical durability under such harsh usage conditions and wear resistance against spark discharge. 9. As an ignition book for this purpose, there is a known ignition book in which a noble metal tip is arranged at the tip of the center electrode or on the ground electrode surface opposite to this to improve the durability of the electrode. However, even if the center electrode had such a structure, it was extremely difficult to prevent the precious metal tip at the tip from melting and scattering due to repeated spark discharges under extremely harsh operating conditions at high temperatures.
本発明はか＼る実状に鑑みなされたものであって、中心
電極を保持する磁器絶縁体の発火部の先端部内腔に、中
心電極の先端に当接する貴金属グレートと、プラグ軸方
向への多数の連通孔を形成した磁器多孔部材とを積層し
た電極部材を配設し、火花放電を上記磁器部材の連通孔
を通し外ｉｊ４′Ｉｊｌ極と貴金属プレート間で行わせ
る構造とすることにより火花放電（二より生ずる貴金属
の飛散粒子を上記磁器多孔部材で冷却させて付着させ補
助電極的な役割りをもたせることによシ着火性能を向上
させると共に電極寿命の一層の延長をはかるものである
。The present invention has been made in view of the above circumstances, and includes a precious metal grating that abuts the tip of the center electrode, and a precious metal grate that abuts the tip of the center electrode in the inner cavity of the tip of the firing part of the ceramic insulator that holds the center electrode, and a large number of metal grates extending in the axial direction of the plug. An electrode member is provided in which a ceramic porous member having a communication hole formed therein is laminated, and the spark discharge is caused to occur between the outer pole and the noble metal plate through the communication hole of the ceramic member. (By cooling and adhering the scattered noble metal particles generated by the above-mentioned porous porcelain member and acting as an auxiliary electrode, the ignition performance is improved and the life of the electrode is further extended.
以下本発明を図面に照し説明する。The present invention will be explained below with reference to the drawings.
第１図は本発明の実施例を示す要部の縦断面図で、図に
おいて１は中心電極、２は高アルミナ質からなる磁器絶
縁体であ）、中心電極１はＮ１ 等の耐熱金属材からな
シ、この中心電極１を保持する磁器絶縁体２の縮径され
た発火部２ａの内腔には、ｐｔ又はＰｔＩｒ 、 Ｐｔ
Ｒｈ 、 ＰｔＢＪｉ等のＰｔ 合金からなる貴金属プ
レート３と、軸方向に多数の連通孔４ａが形成された磁
器多孔部材４とを積層してなる電極部材５が一体に焼成
され埋設されてなル、この電極部材５の貴金属プレート
３上端面に中心電極１の先端な当接させると共に磁器多
孔部材４の下端面を磁器絶縁体２の発火部２ａの先端に
露出してなる構造としたものであって、上記磁器多孔部
材４は、磁器絶縁体２と同材質あるいはムライト、シリ
カ等の磁器からなるもので磁器絶縁体２の発火部２ａの
先端面を拡大して示す第２図にみられるように軸方向に
格子状、ハニカム構造、三角形１円形等の隔壁４ｂをも
つ（図には格子状のものを示す）任意な形状の連通孔４
ａが形成されてなるものである。なお第１図中６は磁器
絶縁体２を保持する主体金具で、１はこれに突設する外
側電極である。FIG. 1 is a vertical cross-sectional view of the main parts showing an embodiment of the present invention. In the figure, 1 is a center electrode, 2 is a porcelain insulator made of high alumina), and the center electrode 1 is made of a heat-resistant metal such as N1. However, in the inner cavity of the reduced diameter firing part 2a of the porcelain insulator 2 that holds the center electrode 1, there is PT, PtIr, Pt.
An electrode member 5 formed by laminating a noble metal plate 3 made of a Pt alloy such as Rh, PtBJi, etc. and a ceramic porous member 4 in which a large number of communicating holes 4a are formed in the axial direction is integrally fired and buried. The tip of the center electrode 1 is brought into contact with the upper end surface of the noble metal plate 3 of the electrode member 5, and the lower end surface of the ceramic porous member 4 is exposed at the tip of the firing part 2a of the ceramic insulator 2. The porous porcelain member 4 is made of the same material as the porcelain insulator 2 or made of porcelain such as mullite or silica, as shown in FIG. A communication hole 4 of any shape has partition walls 4b in the axial direction in a lattice shape, a honeycomb structure, a triangular shape, a circular shape, etc. (a lattice shape is shown in the figure).
It is formed by forming a. Note that 6 in FIG. 1 is a metal shell that holds the ceramic insulator 2, and 1 is an outer electrode that projects from this.
磁器絶縁体２の発火部２ａを上記せる如き構造とするこ
とにより、中心電極２と外側電極７間の火花放電は電極
部材５の磁器多孔部材４に形成されている連通孔４ａを
通して行なわれ、放電により生ずる貴金属プレート３の
飛散粒子が磁器多孔部材４の格子状（あるいはハニカム
状等）の隔壁４ｂで冷却されて付着し、これが補助電極
として機能することにより電極寿命を延長させると共に
着火性能を向上させる効果を生ずるものである。By structuring the firing portion 2a of the ceramic insulator 2 as described above, spark discharge between the center electrode 2 and the outer electrode 7 is performed through the communication hole 4a formed in the ceramic porous member 4 of the electrode member 5. The scattered particles of the noble metal plate 3 generated by the discharge are cooled and adhered to the lattice-shaped (or honeycomb-shaped, etc.) partition walls 4b of the porous ceramic member 4, and this functions as an auxiliary electrode, extending the electrode life and improving the ignition performance. It has the effect of improving
なお、上記せる実施例に於ては、中心電極１にＮ１ 等
の耐熱金属材を用いたものを示したが、抵抗入り点火プ
ラグ等における先行技術例（例えば特公昭５５−５５６
９７号）に示される如き、ガラス、金属粉末、金属酸化
物、金属炭化物及び耐熱性無機物を主とした抵抗体材料
を用いた中心電極（すなわち電極部材５を直接抵抗体材
料にて加熱封着する）においても同様に適用し得るもの
である。In the above-mentioned embodiment, the center electrode 1 is made of a heat-resistant metal material such as N1.
No. 97), a center electrode using a resistor material mainly made of glass, metal powder, metal oxide, metal carbide, and heat-resistant inorganic material (i.e., the electrode member 5 is directly heat-sealed with the resistor material) This can be similarly applied to the following cases.
以上述べたことから理解されるように、本発明点火プラ
グは磁器絶縁体の発火部先端部分の内腔に、その先端面
に露出し火花連通孔が形成された磁器多孔部材と貴金属
プレートとを積層した電極部材が一体化して配設され、
該電極部材の貴金属プレートを中心電極の先端に当接さ
せた構造をもつ為、燃焼室内の過酷な環境及び火花放電
による電極の損耗を抑止すると共に、火花放電による貴
金属プレートの消耗を補ない得る特長を併せ有し、電極
寿命をさらに延長できるものであシ、従来のこの種点火
プラグにおける問題点を改善し、経済性、着火性能、耐
久性を向上させた点火プラグとして提供できるものであ
る。As can be understood from the above, the spark plug of the present invention includes a porcelain porous member with a spark communication hole exposed at the tip surface and a noble metal plate in the inner cavity of the tip of the ignition part of the porcelain insulator. Laminated electrode members are integrated and arranged,
Since the noble metal plate of the electrode member is in contact with the tip of the center electrode, wear of the electrode due to the harsh environment in the combustion chamber and spark discharge can be suppressed, and the wear of the noble metal plate due to spark discharge can be compensated for. It has a combination of features and can further extend the life of the electrode, and it can be provided as a spark plug that improves the problems of conventional spark plugs of this type and has improved economic efficiency, ignition performance, and durability. .
第１図は本発明点火プラグの実施例の要部縦断面、第２
図は第１図における磁器絶縁体の発火部先端の拡大端面
図である。
１：中心電極、２：磁器絶縁体、３：発大部、３：貴金
属プレート、４：磁器多孔部材、４ａ：連通孔、４ｂ：
隔壁、５：電極部材
代理人 弁理士 竹 内 守Fig. 1 is a longitudinal cross-section of main parts of an embodiment of the spark plug of the present invention;
The figure is an enlarged end view of the tip of the firing part of the porcelain insulator in FIG. 1. 1: Center electrode, 2: Porcelain insulator, 3: Emergence part, 3: Precious metal plate, 4: Porcelain porous member, 4a: Communication hole, 4b:
Bulkhead, 5: Electrode component agent Patent attorney Mamoru Takeuchi
Claims (1)
中心電極の先端と対向するＬ字状外側電極を突設した主
体金具とよ構成る内燃機関用点火プラグにおいて、前記
磁器絶縁体の発火部先端における内腔に、貴金属プレー
トと、プラグ軸方向への多数の連通孔を設けた磁器多孔
部材とを積層した電極部材が配設され、該電極部材は磁
器多孔部材側の端面を磁器絶縁体の発火部先端に露出さ
せて一体化して同時焼成されてなると共に貴金属プレー
トの後端面に中心電極の先端な当接させて構成してなる
ことを特徴とする点火プラグ。A spark plug for an internal combustion engine comprising a ceramic insulator holding a center electrode, and a metal shell having an L-shaped outer electrode protruding from its outer periphery and facing the tip of the center electrode. An electrode member in which a noble metal plate and a porous ceramic member having a large number of communicating holes in the axial direction of the plug are laminated is disposed in the inner cavity at the tip of the firing part, and the electrode member has an end face on the side of the porous ceramic member made of ceramic. What is claimed is: 1. A spark plug characterized in that the insulator is exposed at the tip of the ignition part and simultaneously fired, and the tip of the center electrode is brought into contact with the rear end surface of the noble metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6922284A JPS60212985A (en) | 1984-04-09 | 1984-04-09 | Ignition plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6922284A JPS60212985A (en) | 1984-04-09 | 1984-04-09 | Ignition plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60212985A true JPS60212985A (en) | 1985-10-25 |
Family
ID=13396479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6922284A Pending JPS60212985A (en) | 1984-04-09 | 1984-04-09 | Ignition plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60212985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013542572A (en) * | 2010-10-28 | 2013-11-21 | フェデラル−モーグル・イグニション・カンパニー | Suppression of non-thermal plasma ignition arc |
-
1984
- 1984-04-09 JP JP6922284A patent/JPS60212985A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013542572A (en) * | 2010-10-28 | 2013-11-21 | フェデラル−モーグル・イグニション・カンパニー | Suppression of non-thermal plasma ignition arc |
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