JPS625581A - Small ignition plug - Google Patents
Small ignition plugInfo
- Publication number
- JPS625581A JPS625581A JP14244185A JP14244185A JPS625581A JP S625581 A JPS625581 A JP S625581A JP 14244185 A JP14244185 A JP 14244185A JP 14244185 A JP14244185 A JP 14244185A JP S625581 A JPS625581 A JP S625581A
- Authority
- JP
- Japan
- Prior art keywords
- diameter
- insulator
- tip
- metal fitting
- small
- 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】
（産業上の利用分野）
この発明は、各部分特に先端部の寸法を最適条件とした
小型点火プラグに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a small spark plug in which the dimensions of each part, especially the tip, are optimized.
（従来の技術）
近時、内燃機関は出力、燃費向上の必要から、パルプ径
を拡大したシ、バルブ数を増加しているものであるが、
これにしたがって、点火プラグの取付はスペースが限定
縮少され、このために点火プラグを小型化し、着火性を
向上する要求が強まっているものである。ところで、内
燃機関に取付けるねじ径が８１ｍ１，１０■、１２■の
小屋点゛火プラグにおいては、熱的および機械的強度に
おいて径方向に対し寸法的な制約を受けるため、従来の
ものでは外側電極と中心電極又は金具内壁と絶縁体の間
に充分な隙間を設けることができず、正規の火花ギャッ
プ以外での横飛び放電が生じ易く、特に火花ギャップを
拡大して着火性を向上しようとすると、上記横飛び放電
が起り易いものであシ、これが小型点火プラグの開発の
障害となっているものである。(Prior art) In recent years, internal combustion engines have expanded the pulp diameter and increased the number of valves due to the need to improve output and fuel efficiency.
Accordingly, the mounting space for a spark plug has become limited and reduced, and there has been an increasing demand for miniaturizing the spark plug and improving its ignitability. By the way, for spark plugs with thread diameters of 81 mm, 10 mm, and 12 mm that are attached to internal combustion engines, there are dimensional restrictions in the radial direction in terms of thermal and mechanical strength. If a sufficient gap cannot be provided between the center electrode or the inner wall of the metal fitting and the insulator, sideways discharge is likely to occur outside of the regular spark gap, especially when attempting to improve ignition by expanding the spark gap. , the above-mentioned sideways discharge is likely to occur, and this is an obstacle to the development of small spark plugs.
（発明が解決しようとする問題点）
そして、上記点火プラグはガスボリュームが小さくなる
ので耐汚損性が著しく低下し、耐熱性についても従来の
取付けねじ径１４１１ｍのものに比べ、大巾に悪化する
ことが避けられないものであった。(Problems to be Solved by the Invention) Since the gas volume of the spark plug described above is reduced, its fouling resistance is significantly reduced, and its heat resistance is also significantly worse than that of the conventional one with a mounting screw diameter of 1411 m. It was inevitable.
この発明は上記小型点火プラグの欠点を改良するもので
あシ、特に先端部の諸条件を限定することにより火花ギ
ャップ以外での横飛び放電を防止するだけではなく、耐
熱性、耐汚損性を向上しよりとするものである。This invention aims to improve the shortcomings of the above-mentioned small spark plugs. In particular, by limiting various conditions at the tip, it not only prevents sideways discharge outside the spark gap, but also improves heat resistance and stain resistance. It is intended to improve and strengthen.
（問題点を解決するだめの手段）
そこで、上記問題点を解決するために、中心電極と絶縁
体とを同時焼成した小型点火プラグについて、４・サイ
クル２００００Ｃエンジンを用いて５５００ ｒｐｍ
Ｘ ４／４の条件でプレイグニツシヨン発生の点火進角
による耐熱性あ評硫イアた。絶縁体突出寸法と耐熱性、
金具内径と耐熱性について実験を行ったところ、第３図
（絶縁体突出寸法と耐熱性）、第４図（金具内径と耐熱
性）に示すように、取付ねじ径１．０ ｍ 、絶縁体先
端径２． Ｏ−、上記先端径の軸方向長さＱ、 ５ ｍ
、そぎ取り角度６ｄ′。(Means to Solve the Problem) Therefore, in order to solve the above problem, we developed a small spark plug in which the center electrode and the insulator were fired at the same time.
The heat resistance was evaluated due to the ignition advance of pre-ignition under the conditions of X 4/4. Insulator protrusion dimensions and heat resistance,
An experiment was conducted regarding the inner diameter of the fitting and heat resistance, and as shown in Figure 3 (Insulator protrusion dimension and heat resistance) and Figure 4 (Inner diameter of the fitting and heat resistance), the mounting screw diameter was 1.0 m and the insulator was Tip diameter 2. O-, axial length Q of the above tip diameter, 5 m
, scraping angle 6d'.
そぎ取り端部径３．２ｍ、金具内径６．３１１１のもり
Ｎついては、絶縁体突出寸法を大きくすると新規の吸入
ガスに直接触れることとなるので、絶縁体冷却効果があ
シ耐熱性の向上があるが、５．０■以上の突出しは、着
火性の向上は認められても、燃焼ガスの受熱量が大きく
なシ、電極温度の上昇による腐食消耗の増大を招くもの
であシ、第４図は、突出寸法をｉ−ｓ ｍとし、脚長１
１．０■とじ、他は第３図の条件と同一とした場合であ
シ、金具内径は増大するにつれ横飛び電圧の上昇による
着火性の向上が認められ、新規吸入ガスによる絶縁体冷
却作用があシ耐熱性の向上が認められるが取付けねじ径
の０．７２倍以上の場合、金具の肉厚が減少し、その強
度を低下させるものである。また、絶縁体先端部寸法は
、先端径を１．０〜３．０１１１中心電極先端径を０．
３〜Ｑ、 ｇ ｍ 、発火部寸法については、先端径の
軸方向寸法を０．５〜１．０．そぎ取り角、３０〜６０
．そぎ取り端部径は先端径との差を０．６■（４，０１
１以下さ径小化する。〉？）で耐汚損性の向上があシ、
外側電極との間隙を大きくとることができ、横飛び電圧
も高くな）着火性が良好であることが判明した。したが
って、絶縁体先端径は１、Ｑ Ｗｌｌ 〜３． Ｏｗ
先端の軸方向の寸法を０．３〜１．０■、そぎ取り角度
３０〜６０．そぎ取り端部径は４−以下とするものであ
る。For Mori N with a scraped end diameter of 3.2 m and a metal fitting inner diameter of 6.3111 mm, increasing the protruding dimension of the insulator will bring it into direct contact with new intake gas, so the insulator will have a cooling effect and improve heat resistance. However, even if a protrusion of 5.0■ or more is recognized as improving ignitability, the amount of heat received by the combustion gas is large, and corrosion wear and tear due to an increase in electrode temperature increases. In the figure, the protrusion dimension is i-s m, and the leg length is 1.
1.0 ■ When the other conditions are the same as in Figure 3, as the inner diameter of the metal fittings increases, the ignitability improves due to the rise in horizontal jump voltage, and the cooling effect of the insulator due to the new intake gas increases. Although it is recognized that the heat resistance is improved, when the diameter of the mounting screw is 0.72 times or more, the wall thickness of the metal fitting decreases and its strength decreases. The dimensions of the insulator tip are 1.0 to 3.0111 for the tip diameter and 0.11 for the center electrode tip diameter.
3~Q, gm, and firing part dimensions, the axial dimension of the tip diameter is 0.5~1.0. Scraping angle, 30-60
．． The difference between the scraped end diameter and the tip diameter is 0.6■ (4,01
Reduce the diameter by 1 or less. 〉? ) improves stain resistance.
It was found that the ignition performance was good (the gap between the outer electrode and the outer electrode was large, and the horizontal jump voltage was also high). Therefore, the insulator tip diameter is 1, Q Wll ~3. Ow
The axial dimension of the tip is 0.3 to 1.0 mm, and the scraping angle is 30 to 60 mm. The diameter of the scraped end is 4 mm or less.
（作用）
上記各部分の要件を限定する構成よりなるものであシ、
極めて耐熱性、耐汚損性も向上し、取付ねじ径１４１１
１１の点火プラグに比べ遜色の４１ｎものとなるもので
ある。(Function) It consists of a configuration that limits the requirements of each of the above parts,
Extremely heat resistant and stain resistant, with a mounting screw diameter of 1411 mm.
It is a 41n spark plug, which is inferior to the No. 11 spark plug.
（実施例）
ここで図面に示す実施例について説明する。（１）は金
具であり、（Ｇ）は金具（１１の取付けねじ径である。(Example) Here, an example shown in the drawings will be described. (1) is a metal fitting, and (G) is the mounting screw diameter of the metal fitting (11).
（２）は絶縁体であ！＞、（３）は中心電極であシ、１
６００℃以上の融点を有するｐｔ及びｐｔ合金線材又は
Ａ−ｅｔＯｓ などの窯業粉末に前記貴金属をコーテン
グした粉体を焼結したものよりなシ、上記絶縁体（２）
の製造における未焼成の工程上で、先端に挿入するか、
あるいは、絶縁体粉末のプレス成形時、同時プレスによ
）絶縁体先端に嵌挿し、その後絶縁体焼成により一体化
するものである。（４）は接地電極、（５）は中心電極
（３）とガラスシール（６）とを結ぶ中間電極であ’）
、Ｆ ｅ −Ｎ ｉ −Ｃｏ合金等の低膨張合金ある
いはＡＪ、０８ ＫＮ ｉを被覆した粉末や、５ＴＩ１
０等の抵抗粉末を充填することにょ多形成される。（力
は抵抗体、（８）はガラスシールで、これを介して端子
（９）と連結する。第２図における（Ａ）は絶縁体先端
径であ！り、（Ｂ）は上記先端径（２）の軸方向の直線
部分の寸法であシ、Ωは上記直線部分の下端より金具（
１）端面に至る絶縁体（２）の先端部のそぎ取り角（傾
斜部分の傾斜角）であシ、■は、上記そぎ取り端部にお
ける絶縁体（２）の径、［Ｆ］は絶縁体（２）の金具端
部よりの突出寸法であシ、［Ｆ］は金具（１）の発火部
側内径を示し、Ｇ）は、金具（１）の内燃機関に取付け
る、取付けねじ径である。(2) is an insulator! >, (3) is the center electrode, 1
The above-mentioned insulator (2) is made by sintering a ceramic powder such as PT and PT alloy wire having a melting point of 600°C or higher or A-etOs coated with the noble metal.
Insert into the tip during the unfired process in the manufacture of
Alternatively, it is inserted into the tip of the insulator (by simultaneous pressing during press molding of the insulator powder), and then integrated by firing the insulator. (4) is the ground electrode, and (5) is the intermediate electrode connecting the center electrode (3) and the glass seal (6).
, low expansion alloy such as Fe-Ni-Co alloy or powder coated with AJ, 08KNi, 5TI1
It is formed by filling resistance powder of 0 grade. (The force is a resistor, and (8) is a glass seal, through which it is connected to the terminal (9). In Fig. 2, (A) is the diameter of the tip of the insulator, and (B) is the diameter of the tip. (2) is the dimension of the straight part in the axial direction, and Ω is from the lower end of the straight part to the metal fitting (
1) The scraping angle (inclination angle of the sloped part) of the tip of the insulator (2) that reaches the end face, ■ is the diameter of the insulator (2) at the scraped end, [F] is the insulation [F] is the inner diameter of the metal fitting (1) on the ignition part side, and G) is the diameter of the mounting screw of the metal fitting (1) that is attached to the internal combustion engine. be.
そして、前記のとお夛、Ａ−Ｇｔでの寸法について実験
上得られる数値的限定を与えることにょシ、従来の小型
点火プラグに生じる横飛び放電を解消することができる
。In addition to the above, the sideways discharge that occurs in conventional small ignition plugs can be eliminated by providing a numerical limit obtained experimentally for the A-Gt dimension.
（発明の効果）
以上のとおシ、小呈点火プラグにおける致命的欠陥であ
る火花ギャップ以外の横飛び放電を防止できるほか、絶
縁体の突出寸法を充分確保できるので、新規吸入ガスに
よる冷却が可能であシ、耐熱性、耐汚損性を向上するこ
とができる優れた効果をもつものである。(Effects of the invention) As described above, it is possible to prevent sideways discharge other than the spark gap, which is a fatal defect in small spark plugs, and also to ensure sufficient protrusion dimension of the insulator, allowing cooling with new intake gas. It has an excellent effect of improving scratch resistance, heat resistance, and stain resistance.
第１図は、この発明の点火プラグの一部縦断面図、第２
図は要部の拡大図にして、第３図、第４図は各要素間の
関係図である。
１−・金具、２・・・絶縁体、３・・・中心電極、４・
−接地電極、５−中間電極、６，８・・・ガラスシール
、７・−・抵抗体、９・・・端子。
特許出厘人 代理人弁理士 藤木三幸第１図FIG. 1 is a partial longitudinal sectional view of the spark plug of the present invention, and FIG.
The figure is an enlarged view of the main part, and FIGS. 3 and 4 are relationship diagrams between each element. 1- Metal fitting, 2... Insulator, 3... Center electrode, 4...
- ground electrode, 5 - intermediate electrode, 6, 8... glass seal, 7... resistor, 9... terminal. Patent agent Representative patent attorney Miyuki Fujiki Figure 1
Claims (3)
金属又はその合金を電極として同時焼成してなり、絶縁
体先端径Ａ、その軸方向の寸法Ｂ、段部からのそぎ取り
角Ｃ°、そぎ取り端部径Ｄとして、Ａ＝１．０〜３．０
ｍｍ、Ｂ＝０．３〜１．０ｍｍ、角度Ｃ＝３０〜６０°
、Ｄ−Ａ／２＞０．３ｍｍ、Ｄ＜４ｍｍである取付けね
じ径１２ｍｍ以下の小型点火プラグ。(1) A noble metal or alloy thereof having a melting point of 1,600°C or more is co-fired as an electrode at the tip of the insulator, and the tip diameter of the insulator, A, its axial dimension B, and the scraping angle from the stepped portion C. °, as the scraped end diameter D, A = 1.0 to 3.0
mm, B=0.3~1.0mm, angle C=30~60°
, D-A/2>0.3mm, D<4mm, and a small ignition plug with a mounting screw diameter of 12mm or less.
＝１．０〜５．０ｍｍである特許請求の範囲第１項所載
の小型点火プラグ。(2) As the dimension E from the end of the metal fitting to the end of the insulator, E
The small spark plug according to claim 1, wherein the diameter is 1.0 to 5.0 mm.
、０．７２Ｇ≧Ｆ≧０．６０Ｇｍｍである特許請求の範
囲第１項記載の小型点火プラグ。(3) The small ignition plug according to claim 1, wherein the distance between the inner diameter F on the ignition part side of the metal fitting and the mounting screw diameter G is 0.72G≧F≧0.60Gmm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14244185A JPS625581A (en) | 1985-07-01 | 1985-07-01 | Small ignition plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14244185A JPS625581A (en) | 1985-07-01 | 1985-07-01 | Small ignition plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS625581A true JPS625581A (en) | 1987-01-12 |
Family
ID=15315384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14244185A Pending JPS625581A (en) | 1985-07-01 | 1985-07-01 | Small ignition plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS625581A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0544646U (en) * | 1991-11-21 | 1993-06-15 | 三菱自動車工業株式会社 | Car window lunch channel structure |
| KR20160024989A (en) | 2013-06-26 | 2016-03-07 | 리켄 비타민 가부시키가이샤 | Coagulant composition for tofu and method for manufacturing tofu using same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647915U (en) * | 1979-09-20 | 1981-04-28 | ||
| JPS5840789A (en) * | 1981-08-20 | 1983-03-09 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | High voltage ignition plug |
-
1985
- 1985-07-01 JP JP14244185A patent/JPS625581A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647915U (en) * | 1979-09-20 | 1981-04-28 | ||
| JPS5840789A (en) * | 1981-08-20 | 1983-03-09 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | High voltage ignition plug |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0544646U (en) * | 1991-11-21 | 1993-06-15 | 三菱自動車工業株式会社 | Car window lunch channel structure |
| KR20160024989A (en) | 2013-06-26 | 2016-03-07 | 리켄 비타민 가부시키가이샤 | Coagulant composition for tofu and method for manufacturing tofu using same |
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