JPH02207476A - Spark plug for internal combustion engine - Google Patents
Spark plug for internal combustion engineInfo
- Publication number
- JPH02207476A JPH02207476A JP2678689A JP2678689A JPH02207476A JP H02207476 A JPH02207476 A JP H02207476A JP 2678689 A JP2678689 A JP 2678689A JP 2678689 A JP2678689 A JP 2678689A JP H02207476 A JPH02207476 A JP H02207476A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- spark
- alloy
- internal combustion
- combustion engine
- 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 abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 20
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 15
- 229910000575 Ir alloy Inorganic materials 0.000 claims abstract 2
- 238000010304 firing Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 10
- 239000011521 glass Substances 0.000 abstract description 2
- 239000011810 insulating material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 229910002835 Pt–Ir Inorganic materials 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910000580 Lr alloy Inorganic materials 0.000 description 1
- 229910002845 Pt–Ni Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910001055 inconels 600 Inorganic materials 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、内燃機関に使用されるスパークプラグに間
する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a spark plug used in an internal combustion engine.
（従来の技術）
近年、内燃機間の高性能化に伴って、この内燃機関に使
用されるスパークプラグの発火部電極には、長期間に渡
って火花放電の強度を維持し、火花消耗に対して行なう
メインテナンスを容易にするために、Ｐｔ或はＰｔ−Ｉ
ｒ合金を用いることが実施されているものである。(Prior art) In recent years, with the improvement in performance of internal combustion engines, the ignition part electrode of the spark plug used in this internal combustion engine has been developed to maintain the intensity of spark discharge over a long period of time and to prevent spark consumption. To facilitate maintenance, Pt or Pt-I
The use of r-alloy has been implemented.
（発明が解決しようとする課題）
しかしながら、上記従来のものにおいて、発火部電極に
おいてスパークプラグの長寿命化を図るためにＰｔ或は
Ｐｔ−Ｉｒ合金を用いる場合、発火部電極に用いるＰｔ
或はＰｔ−Ｉｒ合金は高融点である貴金属或は貴金属合
金であることから、火花消耗性や耐酸化性に優れるもの
であり、スパークプラグとしての長寿命化やメインテナ
ンスの容易化は達成できるが、同径のＮｉ合金からなる
発火部電極と比較して、通常内燃機間に取り付けて使用
していると発大部電極の酸化が生じにくいので、燃焼ガ
スに着火するために必要となる発火部電極と外側電極と
の間に起こる火花に要する放電電圧が高くなり、車両に
おける電気系統に著しい負担をかけ、故障の原因となっ
たり、又、放電電圧のムラに起因して燃焼室内における
着火が正常に行なわれなくなり、燃費率の低下を招く欠
点がある。そこで、この発明は上記従来のものの持つ欠
点を改善するものであり、長期間の使用において著しい
電気系統への負荷を取り除くと共に、放電電圧のムラに
起因して生ずる燃焼室内での着火不整を防止しようとす
るものである。(Problem to be Solved by the Invention) However, in the above-mentioned conventional device, when Pt or Pt-Ir alloy is used in the firing part electrode in order to extend the life of the spark plug, the Pt used in the firing part electrode is
Also, since Pt-Ir alloy is a noble metal or noble metal alloy with a high melting point, it has excellent spark consumption and oxidation resistance, and can achieve long life and easy maintenance as a spark plug. Compared to the ignition part electrode made of Ni alloy of the same diameter, the ignition part electrode is less likely to oxidize when it is normally installed between internal combustion engines, so it is less likely to oxidize, which is necessary for igniting the combustion gas. The discharge voltage required for the spark that occurs between the electrode and the outer electrode increases, placing a significant burden on the vehicle's electrical system and causing failure, and unevenness in the discharge voltage may cause ignition in the combustion chamber. This has the disadvantage that it may not be carried out properly, resulting in a decrease in fuel efficiency. Therefore, the present invention aims to improve the drawbacks of the above-mentioned conventional devices, and eliminates the significant load on the electrical system during long-term use, as well as prevents irregular ignition in the combustion chamber caused by uneven discharge voltage. This is what I am trying to do.
（課題を解決するための手段）
そのために、発火部電極を２種以上の合金からなる、す
なわち発火部電極を構成する中心部は火花耐久性向上材
質で、その中心部を被覆する外周部は放電電圧低減材質
とする径方向にクラッドするクラッド構造とし、更にこ
の発火部電極を構成する中心部を火花耐久性向上材質と
し、その中心部を被覆する外周部には放電電圧低減材質
とするものであり、特に中心部をＰｔ−１０〜３０χ１
ｒ合金、その外周部をＰｔ−２０〜６０＄Ｎ ｉ合金若
しくは耐熱Ｎｉ合金とするものであり、更には、円筒形
状であるクラッド構造の発火部電極の上部を下部よりも
細径とし凸形状としてなるものである。(Means for solving the problem) To this end, the firing part electrode is made of an alloy of two or more types, that is, the central part of the firing part electrode is made of a material that improves spark durability, and the outer peripheral part that covers the central part is made of a material that improves spark durability. It has a radial cladding structure made of a material that reduces discharge voltage, and the center part of the firing part electrode is made of a material that improves spark durability, and the outer periphery that covers the center part is made of a material that reduces discharge voltage. In particular, the central part is Pt-10~30χ1
r alloy, and its outer periphery is made of Pt-20 to 60$Ni alloy or heat-resistant Ni alloy, and furthermore, the upper part of the cylindrical clad structure firing part electrode has a smaller diameter than the lower part and has a convex shape. It will be as follows.
（作用）
上記構成を具えるので、発火部電極が２種以上の合金か
らなり、径方向にクラッド構造としてなるものであるか
ら、発火が繰り返されることによって熱により表面を被
覆するＰｔ−２０〜６０＄Ｎ ｉ合金若しくは耐熱Ｎｉ
合金等の放電電圧低減材質が酸化されるので、放電電圧
を低減させることができ、しかも、中心部を火花に対し
て耐久性を持たせることができる上、発火部電極を凸形
状として、放電面を広くしてなるものである。(Function) With the above configuration, the ignition part electrode is made of two or more types of alloys and has a radial clad structure, so that the Pt-20 to Pt-20 surface is coated with heat due to repeated ignition. 60$ Ni alloy or heat-resistant Ni
Since discharge voltage reducing materials such as alloys are oxidized, the discharge voltage can be reduced, and the center part can be made durable against sparks. It is made by widening the surface.
（実施例） この発明を図に示す実施例により更に説明する。(Example) This invention will be further explained with reference to embodiments shown in the drawings.
（１）は、この発明の実施例である内燃機関用スパーク
プラグであり、この内燃機関用スパークプラグ（１）は
、２種以上の合金を径方向にクラッドしてなる、クラッ
ド構造を有する発火部電極（３）を中心電極（４）の先
端に接合し、この中心電極（４）と軸孔（１２）内に導
電性ガラスシール材（１０）で抵抗体（１３）を挟んで
端子電極（１１）を封入、保持してなる絶縁体（２）と
、更に上記発火部電極（３）に対向する外側電極（７）
を具え、内燃機関に取り付けるときに必要とするネジ部
（６）を配設する主体金具（５）から構成されるもので
ある。そして、Ｎｉ合金或はＮｉ合金のシース内にＣｕ
を封入した複合電極材からなる中心電極（４）の先端に
接合される発火部電極（３）は、中心部（８）には火花
耐久性向上材質であるＰｔ−１０〜３０％ ｌ ｒ合金
を、更にその中心部（８）を被覆する外周部（９）には
放電電圧低減材質であるＰｔ−２０〜６０％Ｎｉ合金（
インコネル６００）若しくは耐熱Ｎｉ合金（Ｐｔ−４０
驚Ｎｉ合金）とし、径方向にクラッドしてなる構造のワ
イヤー状のものを切断して発火部電極（３）とするもの
である、このため、火花耐久性向上材質からなる中心部
（８）の外周を被覆する外周部（９）がＰｔ−２０〜６
０χＮｉ合金若しくは耐熱Ｎｉ合金であるため、通常の
内燃機関に取り付けて使用すると、この外周部（９）は
燃焼ガスへの着火により発生する熱及び火花放電により
表面が酸化を受けることになり、放電電圧を低減させる
ことができるものである。(1) is a spark plug for an internal combustion engine, which is an embodiment of the present invention. The terminal electrode (3) is connected to the tip of the center electrode (4), and the resistor (13) is sandwiched between the center electrode (4) and the shaft hole (12) with a conductive glass sealing material (10). (11), and an outer electrode (7) facing the firing part electrode (3).
It is composed of a metal shell (5) on which a threaded portion (6) necessary for attachment to an internal combustion engine is disposed. Then, Cu is placed inside the Ni alloy or Ni alloy sheath.
The firing part electrode (3) is joined to the tip of the center electrode (4) which is made of a composite electrode material filled with Pt-10 to 30% lr alloy, which is a spark durability improving material, in the center part (8). Furthermore, the outer peripheral part (9) covering the central part (8) is made of a Pt-20 to 60% Ni alloy (
Inconel 600) or heat-resistant Ni alloy (Pt-40)
The ignition part electrode (3) is made by cutting a wire-like structure made of Ni alloy) and clad in the radial direction.For this reason, the central part (8) is made of a material that improves spark durability. The outer periphery (9) covering the outer periphery of Pt-20 to Pt-6
Since it is a 0χNi alloy or a heat-resistant Ni alloy, when it is installed and used in a normal internal combustion engine, the surface of this outer peripheral part (9) will be oxidized by the heat generated by ignition of combustion gas and spark discharge, and the discharge will occur. It is possible to reduce the voltage.
また、発火部電極（３）の形状は、第３図に示すように
、円筒形状であるクラッド構造をしているワイヤー状の
ものを切断した上、塑性加工を施すことにより、発火部
電極（３）の上部を下部よりも細径とする凸形状として
なるものや、中心電極（４）の外端縁に対して切削加工
を施すことによって、発火部電極（３）のみを突出させ
るような形状（第４図）として放電面における消炎（冷
却）作用をできるだけ少なくすることもできるものであ
る。In addition, as shown in Fig. 3, the shape of the firing part electrode (3) is obtained by cutting a wire-like material having a cylindrical clad structure and applying plastic working to the shape of the firing part electrode (3). 3) has a convex shape with the upper part having a smaller diameter than the lower part, or the outer edge of the center electrode (4) is cut so that only the firing part electrode (3) protrudes. The shape (FIG. 4) also makes it possible to minimize the flame-extinguishing (cooling) effect on the discharge surface.
なお、外周部（９）にＰｔ−Ｎｉ放電電圧低減材質を使
用したとすると、Ｎｉの添加量が重量比で２０χを超え
ると熱に対する耐酸化性が劣化するので、発火部電極（
３）の表面は酸化され易くなり、より放電電圧の低減が
容易に行なわれるものとなり、更に６０Ｘ以上となると
ある程度の火花消耗性を維持しつつ（Ｎｉ合金材よりは
良好）、発火部電極（３）の直径を小さくすることがで
きるものである。このため、発火部電極（３）の外径を
φＤとすると中心部（８）の直径φｄは、φｄ≧０．８
φＤが望ましいものであるが、外周部（９）にＮｉ合金
を使用したとすると、φｄ≧０．９φＤの方が適当であ
る。In addition, if Pt-Ni discharge voltage reducing material is used for the outer peripheral part (9), if the amount of Ni added exceeds 20χ in terms of weight ratio, the oxidation resistance against heat will deteriorate, so the ignition part electrode (
The surface of 3) becomes more easily oxidized, making it easier to reduce the discharge voltage, and when the voltage exceeds 60X, the ignition part electrode ( 3) can be made smaller in diameter. Therefore, if the outer diameter of the firing part electrode (3) is φD, the diameter φd of the center part (8) is φd≧0.8
Although φD is desirable, if Ni alloy is used for the outer peripheral portion (9), it is more appropriate that φd≧0.9φD.
（発明の効果）
以上のとおり、発火部電極に火花耐久性向上材質と放電
電圧低減材質とからなるクラッド構造を用いることによ
り、火花消耗性を確実に保持しつつ、放電電圧特性を改
良することが可能となるので、内燃機関の高性能化に伴
って要請されるスパークプラグの特性を十分に満たすこ
とができる優れた効果を有するものである。(Effects of the Invention) As described above, by using a clad structure made of a spark durability improving material and a discharge voltage reducing material for the ignition part electrode, it is possible to improve the discharge voltage characteristics while reliably maintaining spark consummability. Therefore, it has an excellent effect of fully satisfying the characteristics of spark plugs required as the performance of internal combustion engines increases.
例の要部拡大断面図、第４図は、第３実施例の要部拡大
断面図である。FIG. 4 is an enlarged sectional view of the main part of the third embodiment.
ｌ・・・内燃機関用スパークプラグ ２・・・絶縁体３
・・・発火部電極 ４・・・中心電極 ７・・・外側電
極８・・・中心部 ９・・・外周部
特許出願人 代理人 弁理士 藤 木 三 幸l...Spark plug for internal combustion engine 2...Insulator 3
... Firing part electrode 4 ... Center electrode 7 ... Outer electrode 8 ... Center part 9 ... Outer periphery Patent applicant Agent Patent attorney Miyuki Fujiki
第１図は、この発明の実施例である内燃機関用スパーク
プラグ全体の部分断面図、第２図は、第１実施例の要部
拡大断面図、第３図は、第２実施第１図
第２図
第３図
第４FIG. 1 is a partial sectional view of the entire spark plug for an internal combustion engine which is an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part of the first embodiment, and FIG. 3 is the first embodiment of the second embodiment. Figure 2 Figure 3 Figure 4
Claims (3)
性向上材質で、その中心部を被覆する外周部は放電電圧
低減材質として、２種以上の合金を径方向にクラッドし
てなる内燃機関用スパークプラグ。(1) In the discharge part of the center electrode, the center part is made of a material that improves spark durability, and the outer peripheral part that covers the center part is made of a material that reduces discharge voltage. Engine spark plug.
０〜３０％Ｉｒに合金、その中心部を被覆する外周部に
は放電電圧低減材質としてＰｔ−２０％〜６０％Ｎｉ合
金或は耐熱Ｎｉ合金としてなる請求項（１）、記載の内
燃機関用スパークプラグ。(2) The spark durability improving material used in the center is Pt-1.
0 to 30% Ir alloy, and the outer periphery covering the center part is made of a Pt-20% to 60% Ni alloy or a heat-resistant Ni alloy as a discharge voltage reducing material. Spark plug.
部を下部よりも細径とし、凸形状としてなる請求項（１
）、又は（２）、記載の内燃機関用スパークプラグ。(3) Claim (1) The upper part of the cylindrical clad structure firing part electrode has a smaller diameter than the lower part and has a convex shape.
) or (2), the spark plug for an internal combustion engine as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2678689A JPH02207476A (en) | 1989-02-07 | 1989-02-07 | Spark plug for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2678689A JPH02207476A (en) | 1989-02-07 | 1989-02-07 | Spark plug for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02207476A true JPH02207476A (en) | 1990-08-17 |
Family
ID=12202999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2678689A Pending JPH02207476A (en) | 1989-02-07 | 1989-02-07 | Spark plug for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02207476A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007172866A (en) * | 2005-12-19 | 2007-07-05 | Ngk Spark Plug Co Ltd | Spark plug |
| WO2007118190A3 (en) * | 2006-04-07 | 2008-10-16 | Federal Mogul Corp | Spark plug |
| US10044172B2 (en) | 2012-04-27 | 2018-08-07 | Federal-Mogul Ignition Company | Electrode for spark plug comprising ruthenium-based material |
-
1989
- 1989-02-07 JP JP2678689A patent/JPH02207476A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007172866A (en) * | 2005-12-19 | 2007-07-05 | Ngk Spark Plug Co Ltd | Spark plug |
| JP4563929B2 (en) * | 2005-12-19 | 2010-10-20 | 日本特殊陶業株式会社 | Spark plug |
| WO2007118190A3 (en) * | 2006-04-07 | 2008-10-16 | Federal Mogul Corp | Spark plug |
| US7569979B2 (en) * | 2006-04-07 | 2009-08-04 | Federal-Mogul World Wide, Inc. | Spark plug having spark portion provided with a base material and a protective material |
| US10044172B2 (en) | 2012-04-27 | 2018-08-07 | Federal-Mogul Ignition Company | Electrode for spark plug comprising ruthenium-based material |
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