JPH06101365B2 - Method for manufacturing spark plug for internal combustion engine - Google Patents
Method for manufacturing spark plug for internal combustion engineInfo
- Publication number
- JPH06101365B2 JPH06101365B2 JP15115488A JP15115488A JPH06101365B2 JP H06101365 B2 JPH06101365 B2 JP H06101365B2 JP 15115488 A JP15115488 A JP 15115488A JP 15115488 A JP15115488 A JP 15115488A JP H06101365 B2 JPH06101365 B2 JP H06101365B2
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- spark plug
- electrode
- combustion engine
- internal combustion
- 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
- Spark Plugs (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、内燃機関に使用第３図るスパークプラグの
製造方法に関する。TECHNICAL FIELD The present invention relates to a spark plug manufacturing method for use in an internal combustion engine.
（従来の技術） 従来、内燃機関に使用されるスパークプラグの絶縁体
は、コストや成形作業の行いやすい点からアルミナ（主
原料をAl2O3とする。）を用いるものが一般的であり、
このアルミナを絶縁体に、さらに中心電極にPtを使用
し、同時焼成してなるものや、絶縁体からの放熱性を向
上させるために絶縁体にAlNを使用するものがある。(Prior Art) Conventionally, an insulator of a spark plug used in an internal combustion engine is generally made of alumina (Al 2 O 3 as a main raw material) from the viewpoint of cost and ease of molding work. ,
This alumina is used as an insulator, Pt is used for the center electrode, and is co-fired, and there is a material using AlN for the insulator to improve heat dissipation from the insulator.
（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、絶縁体にアル
ミナを用いると共に、中心電極にPtを使用し、同時焼成
してあんるものの場合、絶縁体がアルミナあるいはアル
ミナを基本とするものであることから、熱伝導率が著し
く低くなり、燃焼室内に突出する脚長部が高温の燃焼ガ
スにさらされることによって、効率のよい熱放散が行な
われず、プレイグニッションの発生点となる問題があ
る。また、絶縁体に良熱伝導性のセラミックであるAlN
等を使用するものの場合においては、成形作業工程が困
難なものであり、AlN自体のコストが著しく高いもので
あるから、消耗品であるスパークプラグには適用しにく
いものであるという欠点がある。そこで、この発明は上
記従来のもののもつ欠点を改善するものであり、良熱伝
導性の絶縁体を用い、広範囲に使用できる小型のスパー
クプラグの製造方法を得ようとするものである。(Problems to be Solved by the Invention) However, in the above-mentioned conventional one, when alumina is used for the insulator and Pt is used for the center electrode and co-firing, the insulator is basically alumina or alumina. Therefore, the thermal conductivity is remarkably low, and the long leg parts protruding into the combustion chamber are exposed to the high temperature combustion gas, so that efficient heat dissipation is not performed and it becomes a preignition generation point. There's a problem. In addition, the insulator is AlN, which is a ceramic with good thermal conductivity.
In the case of using the above-mentioned materials, the molding work process is difficult, and the cost of AlN itself is extremely high. Therefore, it is difficult to apply it to a consumable spark plug. Therefore, the present invention is intended to improve the above-mentioned drawbacks of the conventional ones, and to obtain a small-sized spark plug manufacturing method which can be widely used by using an insulator having good thermal conductivity.
（課題を解決するための手段） そのために、絶縁体が熱伝導率を60w/m・ｋ以上とする
或は0.1〜10μｍの測定波長領域において単位厚さ1mm当
り光透過率が５％以上であるAlNよりなり、この絶縁体
の先端側の放電部電極をIrあるいはIr−Pt合金、Ir−Ni
合金のIr合金と、前記放電部電極に接続する中間電極を
Ｗ、Moの金属あるいはMoSi2、WC、ZrB2の導電性セラミ
ックからなるものとし、これら放電部電極と中間電極を
接合して前記絶縁体と同時焼成するものである。(Means for solving the problem) For that purpose, the insulator has a thermal conductivity of 60 w / m · k or more, or a light transmittance of 5% or more per unit thickness of 1 mm in the measurement wavelength region of 0.1 to 10 μm. It consists of a certain AlN, and the discharge part electrode on the tip side of this insulator is Ir or Ir-Pt alloy, Ir-Ni
The alloy of Ir and the intermediate electrode connected to the discharge part electrode are made of W or Mo metal or MoSi 2 , WC, ZrB 2 conductive ceramic, and the discharge part electrode and the intermediate electrode are joined to each other. It is fired at the same time as the insulator.
（作用） 上記構成を具えるので、脚長部が燃焼室内において、高
温の燃焼ガスにさらされても、絶縁体が熱伝導率を60w/
m・ｋ以上とする或は0.1〜10μｍの測定波長領域におい
て単位厚さ1mm当り光透過率が５％以上であるAlNとなる
ことから、熱放散が効率よく行なうことができ、さらに
中心電極の放電部電極がIr、Ir合金及び中間電極が、高
融点のＷ、Moよりなるものや、MoSi2、WC、ZrB2の導電
性セラミックよりなるから、AlNと同時に焼成すること
ができ、成形を容易なのとすることができる。(Operation) With the above configuration, even if the long leg portion is exposed to high temperature combustion gas in the combustion chamber, the insulator has a thermal conductivity of 60 w /
Since AlN has a light transmittance of 5% or more per unit thickness of 1 mm in the measurement wavelength region of m · k or more or 0.1 to 10 μm, heat can be efficiently dissipated and the center electrode Since the discharge part electrode is made of Ir, Ir alloy, and the intermediate electrode is made of high melting point W or Mo, or is made of conductive ceramic of MoSi 2 , WC, ZrB 2 , it can be fired at the same time as AlN. It can be easy.
（実施例） この発明を図に示す実施例により更に説明する。（１）
は、この発明の実施例を具える内燃機関用スパークプラ
グであり、この内燃機関スパークプラグ（１）は、内方
に先端にIr或はIr合金（Ir−Pt、Ir−Ni等の融点180℃
以上とするもの）からなる中心電極（３）の放電部電極
（８）を高温ロー材（９）によって中間電極（２）に接
合し、これを内挿、保持する絶縁体（４）及び主体金具
（５）、ネジ部（６）並びに、外側電極（７）から構成
されているものである。そして、中間電極（２）及び放
電部電極（８）を軸孔内に嵌挿、保持する絶縁体（４）
は、熱伝導率を60w/m・ｋ以上、或は0.1〜10μｍの測定
波長領域において単位厚さ1mm当り光透過率が５％以上
であるAlN（透光性のものでも良い）とするものであ
り、さらに中間電極（２）の材質が、1800℃以上の融点
を有するもの、例えばＷ、Moの金属、MoSi2、WC、ZrB2
の導電性セラミックからなるものとするものであり、成
形時において高温で焼結する必要のあるAlN等のセラミ
ックと、例えばＷ、Moの金属、MoSi2等の導電性セラミ
ックからなる中間電極（２）及びIr、Ir合金の放電部電
極（８）を同時焼成することが可能となるものである。
更に、中間電極（２）の先端にIr或はIr合金（Ir−Pt、
Ir−Ni等）からなる放電部電極（８）を接合する高温ロ
ー材（９）をMo−Ni系又はRu−Mo系の融点1800℃以上と
することによって、中間電極（２）及び中心電極（３）
を同時焼成した、AlN（透光性のものでも良い）よりな
る絶縁体（４）に対して、さらにIr或はIr合金（Ir−P
t、Ir−Ni等）からなる放電部電極（８）を高温ロー材
（９）と共に、一体焼成を行うことができ、同時に接合
をも可能なものとすることができる。。なお、（10）は
導電性のガラスシール材、（11）は抵抗体であって、中
間電極（２）は後端をガラスシール材（10）を介して抵
抗体（11）に連結される。(Example) The present invention will be further described with reference to an example shown in the drawings. (1)
Is a spark plug for an internal combustion engine comprising an embodiment of the present invention. The internal combustion engine spark plug (1) has an inwardly tipped end with a melting point of Ir or Ir alloy (Ir-Pt, Ir-Ni, etc.). ℃
Insulator (4) and main body for bonding the discharge part electrode (8) of the center electrode (3) consisting of the above) to the intermediate electrode (2) by the high temperature brazing material (9) and inserting and holding this It is composed of a metal fitting (5), a screw part (6), and an outer electrode (7). And the insulator (4) which inserts and holds the intermediate electrode (2) and the discharge part electrode (8) in the shaft hole.
Is AlN (translucent) that has a thermal conductivity of 60 w / m · k or more, or a light transmittance of 5% or more per unit thickness of 1 mm in the measurement wavelength range of 0.1 to 10 μm. In addition, the material of the intermediate electrode (2) has a melting point of 1800 ° C. or higher, for example, metal of W or Mo, MoSi 2 , WC, ZrB 2
Intermediate electrode composed of a ceramic such as AlN which needs to be sintered at a high temperature during molding and a conductive ceramic such as a metal of W or Mo or MoSi 2 (2 ) And the discharge part electrode (8) of Ir, Ir alloy can be co-fired.
Further, at the tip of the intermediate electrode (2), Ir or Ir alloy (Ir-Pt,
By setting the high temperature brazing material (9) for joining the discharge part electrode (8) made of Ir-Ni or the like to a melting point of Mo-Ni system or Ru-Mo system of 1800 ° C or higher, the intermediate electrode (2) and the center electrode (3)
For an insulator (4) made of AlN (which may be translucent) co-fired with Ir, an Ir or Ir alloy (Ir-P
The discharge part electrode (8) made of t, Ir-Ni, etc. can be integrally fired together with the high-temperature brazing material (9), and at the same time, bonding can be performed. . In addition, (10) is a conductive glass seal material, (11) is a resistor, and the intermediate electrode (2) is connected to the resistor (11) at its rear end via the glass seal material (10). .
（発明の効果） 以上のとおり、高融点の放電部電極及び中間電極とAlN
（透光性のものでも良い）よりなる絶縁体を同時に焼成
することで、熱放散効率の良いものとすることができる
ことによって、小型スパークプラグに都合のよい、絶縁
体の肉厚（ｔ）を従来の小型のそれより厚いものとし
て、絶縁体貫通に対して有効にすることができ、さらに
脚長部の熱に対して放散効率が高めてあるので、さらに
広範囲にわたり使用できるスパークプラグとすることの
できる優れた効果を有するものである。(Effects of the Invention) As described above, the high melting point discharge electrode and intermediate electrode and AlN
By co-firing an insulator made of (translucent material) at the same time, the heat dissipation efficiency can be improved, and the thickness (t) of the insulator, which is convenient for a small spark plug, can be reduced. Since it is thicker than the conventional small size, it can be effectively used for the penetration of the insulator, and since the heat dissipation efficiency for the heat of the leg length is improved, it can be used as a spark plug that can be used in a wider range. It has an excellent effect.
第１図は、この発明の実施例を具える内燃機関用スパー
クプラグの部分断面図、第２図は、製造工程における要
部拡大断面図である。 １…内燃機関用スパークプラグ、２…中間電極、３…中
心電極、４…絶縁体、５…主体金具、６…ネジ部、７…
外側電極、８…放電部電極、９…高温ロー材、10…ガラ
スシール材FIG. 1 is a partial cross-sectional view of a spark plug for an internal combustion engine equipped with an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part in a manufacturing process. DESCRIPTION OF SYMBOLS 1 ... Spark plug for internal combustion engine, 2 ... Intermediate electrode, 3 ... Center electrode, 4 ... Insulator, 5 ... Metal shell, 6 ... Screw part, 7 ...
Outer electrode, 8 ... Discharge part electrode, 9 ... High temperature brazing material, 10 ... Glass sealing material
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭57−152690（ＪＰ，Ａ) 特開 昭61−156683（ＪＰ，Ａ) 実開 昭60−73190（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-57-152690 (JP, A) JP-A-61-156683 (JP, A) Practical application Sho-60-73190 (JP, U)
Claims (2)
lNからなり、この絶縁体の先端側の放電部電極をIrある
いはIr−Pt合金、Ir−Ni合金のIr合金と、前記放電部電
極に接続する中間電極をＷ、Moの金属あるいはMoSi2、W
C、ZrB2の導電性セラミックで形成し、これら放電部電
極と中間電極を接合して前記絶縁体と同時焼成してなる
内燃機関用スパークプラグの製造方法。1. An insulator having a thermal conductivity of 60 w / m · k or more A
the discharge part electrode on the tip side of this insulator is Ir or Ir-Pt alloy, Ir alloy of Ir-Ni alloy, and the intermediate electrode connected to the discharge part electrode is W, Mo metal or MoSi 2 , W
A method for producing a spark plug for an internal combustion engine, which is formed of a conductive ceramic of C or ZrB 2 , and which is formed by joining the discharge part electrode and the intermediate electrode and cofiring with the insulator.
μｍの測定波長領域において単位厚さ1mm当り光透過率
が５％以上である請求項（１）記載の内燃機関用スパー
クプラグの製造方法。2. The ceramic constituting the insulator is 0.1-10.
The method for producing a spark plug for an internal combustion engine according to claim 1, wherein the light transmittance is 5% or more per unit thickness of 1 mm in the measurement wavelength region of μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15115488A JPH06101365B2 (en) | 1988-06-21 | 1988-06-21 | Method for manufacturing spark plug for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15115488A JPH06101365B2 (en) | 1988-06-21 | 1988-06-21 | Method for manufacturing spark plug for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01319282A JPH01319282A (en) | 1989-12-25 |
| JPH06101365B2 true JPH06101365B2 (en) | 1994-12-12 |
Family
ID=15512537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15115488A Expired - Fee Related JPH06101365B2 (en) | 1988-06-21 | 1988-06-21 | Method for manufacturing spark plug for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06101365B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007027319A1 (en) * | 2007-06-14 | 2008-12-18 | Beru Ag | Spark plug and method of making a spark plug |
-
1988
- 1988-06-21 JP JP15115488A patent/JPH06101365B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01319282A (en) | 1989-12-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |