JPH0461779A - Spark plug with bevel-shaped outside electrode - Google Patents
Spark plug with bevel-shaped outside electrodeInfo
- Publication number
- JPH0461779A JPH0461779A JP16939190A JP16939190A JPH0461779A JP H0461779 A JPH0461779 A JP H0461779A JP 16939190 A JP16939190 A JP 16939190A JP 16939190 A JP16939190 A JP 16939190A JP H0461779 A JPH0461779 A JP H0461779A
- Authority
- JP
- Japan
- Prior art keywords
- tip
- noble metal
- flat plate
- electrode
- spark plug
- 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
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- 239000012212 insulator Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 5
- 229910000990 Ni alloy Inorganic materials 0.000 description 4
- 239000010970 precious metal Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000575 Ir alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910000566 Platinum-iridium alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- DDQZSLVVXJOWDT-UHFFFAOYSA-N iridium nickel Chemical compound [Ni].[Ir] DDQZSLVVXJOWDT-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PCLURTMBFDTLSK-UHFFFAOYSA-N nickel platinum Chemical compound [Ni].[Pt] PCLURTMBFDTLSK-UHFFFAOYSA-N 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical class [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、傘状の外側電極で中心電極の発火部を覆う形
状のスパークプラグに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a spark plug having a shape in which an umbrella-shaped outer electrode covers a firing portion of a center electrode.
［従来の技術］
外側電極の耐折損性および着火性の改善を図るため、複
数の穴が穿設された平板部および主体金具の先端部に接
合される複数の脚部、を有する外側電極で中心電極の先
端部を覆ったスパークプラグが知られている。[Prior Art] In order to improve the breakage resistance and ignitability of the outer electrode, an outer electrode has a flat plate portion with a plurality of holes and a plurality of legs joined to the tip of the metal shell. Spark plugs are known in which the tip of the center electrode is covered.
［発明が解決しようとする課題］
本発明者らは、さらに、着火性の向上を図るため、中心
電極の先端を細くしたが、火花が各電極に集中して電極
の消耗が激しくなってしまうというジレンマが発生した
。[Problems to be Solved by the Invention] The present inventors also made the tip of the center electrode thinner in order to improve the ignitability, but sparks were concentrated on each electrode and the electrodes were rapidly worn out. A dilemma arose.
本発明の目的は、着火性に優れるとともに、火花による
スパークギャップの広がりを防止した、傘状の外側電極
を備えたスパークプラグの提供にある。An object of the present invention is to provide a spark plug equipped with an umbrella-shaped outer electrode that has excellent ignitability and prevents the spark gap from widening due to sparks.
［課題を解決するための手段］
上記課題の達成のため、本発明は以下の構成を採用した
。[Means for Solving the Problems] In order to achieve the above problems, the present invention employs the following configuration.
（１）筒状の主体金具と、該主体金具に嵌め込まれて固
定される軸孔付きの絶縁体と、先端を前記絶縁体の先端
から突出して前記軸孔内に固定される中心電極と、該中
心電極の先端とスパークギャップを隔てて配されるとと
もに、複数の穴を有する平板部、および訊平板部の周縁
から延出し前記主体金具の先端部に溶接される複数の脚
部からなる外側電極とを備えた、傘状の外側電極を備え
たスパークプラグにおいて、前記中心電極の先端面に、
中央部が凸状を呈する円柱状の貴金属チップを接合した
。(1) a cylindrical metal shell, an insulator with a shaft hole that is fitted and fixed into the metal shell, and a center electrode whose tip protrudes from the tip of the insulator and is fixed in the shaft hole; an outer side consisting of a flat plate part disposed across a spark gap from the tip of the center electrode and having a plurality of holes; and a plurality of legs extending from the periphery of the flat plate part and welded to the tip of the metal shell; In the spark plug equipped with an umbrella-shaped outer electrode, the center electrode has a tip surface including:
A cylindrical noble metal chip with a convex center was bonded.
（２）さらに、貴金属チップの前部先端の直径は０．３
ｍｍ以上１．２ｍｍ以下であり、かつ貴金属チップの前
部の高さは０．２ｍｍ以上０．４ｍｍ以下とする。(2) Furthermore, the diameter of the front tip of the noble metal tip is 0.3
mm or more and 1.2 mm or less, and the height of the front part of the noble metal chip is 0.2 mm or more and 0.4 mm or less.
［作用および発明の効果］
（請求項１について）
火花は、貴金属チップの端面から外側電極の平板部に均
一的に飛ぶので平板部の電極消耗は少なく、火花による
スパークギャップは広がり難い。[Operations and Effects of the Invention] (Regarding Claim 1) Since sparks fly uniformly from the end face of the noble metal tip to the flat plate portion of the outer electrode, electrode wear on the flat plate portion is small, and the spark gap caused by the sparks is difficult to widen.
貴金属チップの断面が凸状であるので、着火性は良い。Since the cross section of the noble metal tip is convex, the ignitability is good.
（請求項２について）
貴金属チップの前部先端の直径が０．３ｍｍ以上１．２
ｍｍ以下であるので着火性に優れる。なお、０．３ｍｍ
未満であると細すぎて貴金属チップが消耗し易くなる。(Regarding Claim 2) The diameter of the front tip of the noble metal tip is 0.3 mm or more and 1.2 mm.
mm or less, it has excellent ignitability. In addition, 0.3mm
If it is less than that, it will be too thin and the precious metal tip will be easily worn out.
また、１．２ｍｍを越えると太すぎて着火性が悪化する
。Moreover, if it exceeds 1.2 mm, it will be too thick and the ignitability will deteriorate.
貴金属チップの前部の高さが０．２ｍｍ以上０゜４ｍｍ
以下であるので、火花は、貴金属チップの端面から外側
電極の平板部に均一・的に飛ぶ。なお、０．２ｍｍ未満
であると後部の端面から集中して火花が飛ぶ、０．４ｍ
ｍを越えると前部の端面から集中して火花が飛ぶ、０．
２ｍｍ未満や０．４ｍｍを越える場合は、外側電極の消
耗量が大きくなる。The height of the front part of the precious metal tip is 0.2 mm or more and 0°4 mm.
Therefore, sparks fly uniformly and uniformly from the end face of the noble metal tip to the flat plate part of the outer electrode. In addition, if it is less than 0.2 mm, sparks will fly concentrated from the rear end surface.
If it exceeds 0.0 m, sparks will be concentrated from the front end face.
When it is less than 2 mm or more than 0.4 mm, the amount of wear of the outer electrode becomes large.
［実施例］
つぎに、本発明の一実施例を第１図、第２図に基づき説
明する。[Example] Next, an example of the present invention will be described based on FIGS. 1 and 2.
第１図に示すごとく、デルタ状の外側電極を備えたスパ
ークプラグＡは、筒状の主体金具１と、該主体金具１に
嵌め込まれて固定される軸孔２１付きの絶縁体２と、先
端面３１に貴金属チップ４をろう付け（溶接も含む）す
るとともに先端３２を絶縁体２の先端から突出して軸孔
２１内に固定される中心電極と、３個の穴５１を有する
平板部５２、およびこの平板部５２の周縁から延出し主
体金具１の先端部１１に溶接される３本の脚部５３から
なる外側電極５とを具備する。As shown in FIG. 1, a spark plug A equipped with a delta-shaped outer electrode includes a cylindrical metal shell 1, an insulator 2 with a shaft hole 21 that is fitted into and fixed to the metal shell 1, and a distal end. a center electrode having a noble metal tip 4 brazed (including welding) to a surface 31 and having a tip 32 protruding from the tip of the insulator 2 and fixed in the shaft hole 21; a flat plate portion 52 having three holes 51; and an outer electrode 5 consisting of three leg portions 53 extending from the periphery of the flat plate portion 52 and welded to the tip portion 11 of the metal shell 1.
主体金具１は、低炭素鋼で形成され、外周に機関取付は
用のねじ１２が刻まれている。この主体金具１の先端部
１１には外側電極５を溶接する段１３が設けられている
。また内壁にはパツキン１４を周設するテーパ１５が設
けられている。The metal shell 1 is made of low carbon steel, and has screws 12 cut into its outer periphery for engine mounting. A step 13 is provided at the tip 11 of the metal shell 1 to which the outer electrode 5 is welded. Further, a taper 15 surrounding the packing 14 is provided on the inner wall.
絶縁体２は、アルミナなどを主体とするセラミック焼結
体で形成され、基底２２を前記パツキン１４に当接して
いる。The insulator 2 is formed of a ceramic sintered body mainly made of alumina or the like, and has a base 22 in contact with the packing 14 .
中心電極３は、ニッケル合金で形成され、外径は２ｍｍ
である。The center electrode 3 is made of nickel alloy and has an outer diameter of 2 mm.
It is.
貴金属チップ４は、白金−２０％イリジウム合金で形成
され、円柱状を呈し断面は凸状である。The noble metal tip 4 is made of a platinum-20% iridium alloy, has a cylindrical shape, and has a convex cross section.
この貴金属チップ４の後部４１の外径は２．０ｍｍ、前
部の直径は１．０ｍｍ（各均−）である。The outer diameter of the rear part 41 of this noble metal tip 4 is 2.0 mm, and the diameter of the front part is 1.0 mm (average).
また、前部４２の高さは０．３ｍｍである。Further, the height of the front portion 42 is 0.3 mm.
外側電極５は、母材を９０重量％以上のニッケル、１〜
３重量％の珪素１〜３重景％のクロム、０．２〜２重量
％のアルミニウム、３重量％以下のマンガンを添加した
高ニッケル合金で形成されている。この外側電極５の平
板部５２（厚さ１゜０ｍｍ）は、前記貴金属チップ４の
前部４２の先端面４３とスパークギャップ４４を隔てて
平行的に配されている。なお、平板部５２に開けられた
穴５１は、中心から同距離で、がっ１２０°間隔である
。The outer electrode 5 has a base material of 90% by weight or more of nickel, 1~
It is made of a high nickel alloy to which is added 3% by weight of silicon, 1-3% by weight of chromium, 0.2-2% by weight of aluminum, and 3% by weight or less of manganese. The flat plate portion 52 (thickness: 1°0 mm) of the outer electrode 5 is arranged parallel to the tip end surface 43 of the front portion 42 of the noble metal tip 4 with a spark gap 44 in between. Note that the holes 51 made in the flat plate portion 52 are the same distance from the center, and are spaced at intervals of 120 degrees.
つぎに、貴金属チップ４を上記形状にした作用効果を、
以下に示す実験結果で説明する。Next, the effect of making the noble metal tip 4 into the above shape is as follows.
This will be explained using the experimental results shown below.
比較界１のスパークプラグＢは、第２図に示すように、
中心電極３００の外径は２ｍｍである。As shown in Fig. 2, spark plug B of Comparative World 1 has the following characteristics:
The outer diameter of the center electrode 300 is 2 mm.
比較界２のスパークプラグＣは、第３図に示すように、
貴金属チップ４００の外径を１．８ｍｍ（均一）にして
いる。比較界３のスパークプラグＤは、第４図に示すよ
うに、貴金属チップ４００の外径を０．４ｍｍ （均一
）にしている。As shown in Fig. 3, the spark plug C of Comparison World 2 is as follows:
The outer diameter of the noble metal tip 400 is set to 1.8 mm (uniform). In the spark plug D of Comparative World 3, as shown in FIG. 4, the outer diameter of the noble metal tip 400 is 0.4 mm (uniform).
これら比較界のスパークプラグＢ、Ｃ，Ｄは、第５図に
示すようにスパークギャップ４４０が広がったが、本発
明のスパークプラグＡのギャップ４４の広がりは極めて
少なかった。These comparative spark plugs B, C, and D had a spark gap 440 widened as shown in FIG. 5, but the spark plug A of the present invention had a very small gap 44 widened.
第２図〜第４図において、各比較界の電極消耗量は、６
１部分を１とすると、６２部分、６３部分、６４部分は
、それぞれ、０．５．２．３である。本実施例のスパー
クプラグＡでは、外側電極５の消耗量が極めて少なく（
消耗量１に相当）、かつ均一的に消耗する。In Figures 2 to 4, the amount of electrode consumption in each comparative field is 6
If 1 part is 1, then the 62nd part, 63rd part, and 64th part are 0.5.2.3, respectively. In the spark plug A of this embodiment, the wear amount of the outer electrode 5 is extremely small (
(equivalent to consumption amount 1) and is consumed uniformly.
なお、貴金属チップ４としては実施例の白金イリジウム
合金の他に白金−ニッケル合金、イリジウム、イリジウ
ム−ニッケル合金等が使用できる。In addition to the platinum-iridium alloy of the embodiment, platinum-nickel alloy, iridium, iridium-nickel alloy, etc. can be used as the noble metal tip 4.
第１図は本発明の一実施例を示し、デルタ状の外側電極
を備えたスパークプラグの構造説明図である。
第２図〜第４図は比較界のスパークプラグの構造説明図
である。
第５図はこれらのスパークプラグにおいて、使用時間と
ギャップ増加１との関係を示すグラフである。
図中 １・・・主体金具 ２・・・絶縁体 ３・・・中
心環ｉ４・・・貴金属チップ ら・・・外側電極 ２１
・・・軸孔 ３１・・・先端面 ３２・・・先端 ４２
・・・前部 ４４・・・スパークギャップ ５１・・・
穴 ５２・・・平板部５３・・・脚部 Ａ・・・デルタ
状の外側電極を備えたスパークプラグ（傘状の外側電極
を備えたスパークプラグ）FIG. 1 shows one embodiment of the present invention, and is a structural explanatory diagram of a spark plug equipped with a delta-shaped outer electrode. 2 to 4 are structural explanatory diagrams of comparative spark plugs. FIG. 5 is a graph showing the relationship between usage time and gap increase 1 in these spark plugs. In the figure 1... Metal shell 2... Insulator 3... Center ring i4... Precious metal tip et al... Outer electrode 21
...Shaft hole 31...Tip surface 32...Tip 42
...Front part 44...Spark gap 51...
Hole 52...Flat plate part 53...Leg part A...Spark plug with a delta-shaped outer electrode (spark plug with an umbrella-shaped outer electrode)
Claims (1)
と、 先端を前記絶縁体の先端から突出して前記軸孔内に固定
される中心電極と、 該中心電極の先端とスパークギャップを隔てて配される
とともに、複数の穴を有する平板部、および該平板部の
周縁から延出し前記主体金具の先端部に溶接される複数
の脚部からなる外側電極とを備えた、傘状の外側電極を
備えたスパークプラグにおいて、 前記中心電極の先端面に、中央部が凸状を呈する円柱状
の貴金属チップを接合したことを特徴とする傘状の外側
電極を備えたスパークプラグ。 ２）前記貴金属チップの前部先端の直径は０．３ｍｍ以
上１．２ｍｍ以下であり、かつ 前記貴金属チップの前部の高さは０．２ｍｍ以上０．４
ｍｍ以下である ことを特徴とする請求項１記載の、傘状の外側電極を備
えたスパークプラグ[Scope of Claims] 1) A cylindrical metal shell, an insulator with a shaft hole that is fitted into and fixed to the metal shell, and a tip that protrudes from the tip of the insulator and is fixed in the shaft hole. a center electrode, a flat plate portion arranged with a spark gap between the tip of the center electrode and a plurality of holes, and a plurality of holes extending from the periphery of the flat plate portion and welded to the tip of the metal shell. A spark plug equipped with an umbrella-shaped outer electrode comprising an outer electrode consisting of a leg, characterized in that a cylindrical noble metal tip with a convex center portion is bonded to the tip surface of the center electrode. A spark plug with an umbrella-shaped outer electrode. 2) The diameter of the front end of the noble metal tip is 0.3 mm or more and 1.2 mm or less, and the height of the front part of the noble metal tip is 0.2 mm or more and 0.4 mm or less.
2. The spark plug with an umbrella-shaped outer electrode according to claim 1, wherein the spark plug has an outer electrode having an umbrella shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16939190A JPH0461779A (en) | 1990-06-27 | 1990-06-27 | Spark plug with bevel-shaped outside electrode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16939190A JPH0461779A (en) | 1990-06-27 | 1990-06-27 | Spark plug with bevel-shaped outside electrode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0461779A true JPH0461779A (en) | 1992-02-27 |
Family
ID=15885732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16939190A Pending JPH0461779A (en) | 1990-06-27 | 1990-06-27 | Spark plug with bevel-shaped outside electrode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0461779A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2621038A3 (en) * | 2012-01-24 | 2015-04-08 | General Electric Company | Method of producing an electrode support using brazing |
-
1990
- 1990-06-27 JP JP16939190A patent/JPH0461779A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2621038A3 (en) * | 2012-01-24 | 2015-04-08 | General Electric Company | Method of producing an electrode support using brazing |
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