JPH05101869A - Spark plug - Google Patents
Spark plugInfo
- Publication number
- JPH05101869A JPH05101869A JP3264124A JP26412491A JPH05101869A JP H05101869 A JPH05101869 A JP H05101869A JP 3264124 A JP3264124 A JP 3264124A JP 26412491 A JP26412491 A JP 26412491A JP H05101869 A JPH05101869 A JP H05101869A
- Authority
- JP
- Japan
- Prior art keywords
- tip
- core
- outer electrode
- chip
- 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.)
- Granted
Links
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、外側電極の発火部
に、貴金属チップを溶接したスパークプラグに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark plug in which a firing part of an outer electrode is welded with a noble metal tip.
【０００２】[0002]
【従来の技術】自動車エンジンなどのガソリン機関で
は、電極発火部の耐消耗性向上のため、外側電極（接地
電極）の発火部にイリジウム（Ｉｒ）のチップを溶接し
たスパークプラグが提案されている（アメリカ合衆国特
許第３１４６３７０号）。2. Description of the Related Art In a gasoline engine such as an automobile engine, a spark plug in which an iridium (Ir) tip is welded to the ignition part of an outer electrode (ground electrode) has been proposed in order to improve wear resistance of the electrode ignition part. (U.S. Pat. No. 3,146,370).
【０００３】[0003]
【発明が解決しようとする課題】外側電極の発火部は、
中心電極の発火部より機関の燃焼室内に突き出ているた
め、高温度になり易い。特にＩｒは、白金（Ｐｔ）、パ
ラジウム（Ｐｄ）などスパークプラグの電極材として使
用される他の貴金属と比較し、安価であるとともに耐火
花消耗性は優れるが、９００℃を越える高温では酸化揮
発による消耗が激しくなる。また、ガソリン機関が高
速、高出力になるほど、外側電極の発火部は高温になり
易いため、上記酸化揮発に対する防止策が必要となる。
この発明の目的は、ＩｒまたはＩｒ合金をチップとして
外側電極に溶接した場合において、これら貴金属チップ
の過昇温を防止し、かつ酸化揮発を抑制して耐久性の向
上を図ったスパークプラグの提供にある。The ignition part of the outer electrode is
Since it protrudes into the combustion chamber of the engine from the ignition part of the center electrode, the temperature tends to be high. In particular, Ir is less expensive and has better spark wear resistance than other noble metals such as platinum (Pt) and palladium (Pd) that are used as electrode materials for spark plugs, but it is oxidized and volatilized at high temperatures exceeding 900 ° C. Will be consumed more heavily. Further, the higher the speed and the higher the output of the gasoline engine, the higher the temperature of the ignition part of the outer electrode is, so that it is necessary to take measures to prevent the oxidation and volatilization.
An object of the present invention is to provide a spark plug in which, when Ir or an Ir alloy is welded to the outer electrode as a tip, excessive temperature rise of these noble metal tips is prevented and oxidation volatilization is suppressed to improve durability. It is in.
【０００４】[0004]
【課題を解決するための手段】この発明は、主体金具の
先端に突設した外側電極と中心電極との間に火花放電間
隙を形成したスパークプラグにおいて、前記外側電極
は、純ＮｉまたはＮｉ合金製の外側電極母材にＣｕまた
はＡｇを主体とする良熱伝導金属製芯を配してなる複合
材と、該複合材の中心電極側面に形成した穴に、基部が
前記母材中に埋設し、先部が突出してＩｒまたはＩｒ合
金である貴金属チップを嵌め込み、チップと芯との距離
を０．５ｍｍ以下に設定するとともに、チップと母材と
の接合面を溶接してなる。請求項２に記載のスパークプ
ラグにおいて、外側電極は、芯の軸芯に、純Ｎｉまたは
純Ｆｅ製の中芯を設けてなる。請求項３に記載のスパー
クプラグにおいて、チップは、０．１〜１５．０重量％
の稀土類金属酸化物と上記Ｉｒからなる残余とを粉末焼
結した貴金属サーメット製である。請求項４に記載のス
パークプラグにおいて、チップは先部が径大で、基部が
径小の円柱状を呈し、先部外周と外側電極母材との接合
面を全周に沿ってレーザー溶接または電子ビーム溶接し
た。The present invention relates to a spark plug in which a spark discharge gap is formed between an outer electrode protruding from the end of a metal shell and a center electrode, wherein the outer electrode is pure Ni or Ni alloy. A composite material in which a core made of a good heat-conductive metal mainly composed of Cu or Ag is arranged in an outer electrode base material made of metal, and a base is embedded in the base material in a hole formed on the side surface of the center electrode of the composite material. Then, the tip portion is projected and a noble metal tip made of Ir or an Ir alloy is fitted therein, the distance between the tip and the core is set to 0.5 mm or less, and the joining surface between the tip and the base material is welded. In the spark plug according to the second aspect of the present invention, the outer electrode has a core made of pure Ni or pure Fe provided on the axis of the core. The spark plug according to claim 3, wherein the tip is 0.1 to 15.0% by weight.
Noble metal cermet made by powder-sintering the rare earth metal oxide of No. 1 and the remainder made of Ir. 5. The spark plug according to claim 4, wherein the tip has a cylindrical shape with a large diameter at the tip and a small diameter at the base, and laser welding or welding the joint surface between the outer periphery of the tip and the outer electrode base material along the entire circumference. Electron beam welded.
【０００５】[0005]
【発明の作用、効果】この発明では、Ｉｒ製のチップを
外側電極の芯に近接して溶接しているため、気筒内の燃
焼ガスに晒された、チップを含む外側電極の先端部表面
が受けた熱は、芯を介して主体金具に伝達され、機関の
シリンダーヘッドに伝達される熱伝導、いわゆる熱引き
が良好であり、チップが低温に保たれる。このためチッ
プが酸化揮発し易い９００℃以上になることが有効に防
止され、スパークプラグの耐久性が向上できる。According to the present invention, since the tip made of Ir is welded near the core of the outer electrode, the tip surface of the outer electrode including the tip exposed to the combustion gas in the cylinder is not exposed. The received heat is transferred to the metal shell via the core, and the heat conduction, that is, heat conduction, which is transferred to the cylinder head of the engine is good, and the chip is kept at a low temperature. Therefore, it is possible to effectively prevent the tip from being oxidized and volatilized at a temperature of 900 ° C. or higher, and the durability of the spark plug can be improved.
【０００６】請求項３に記載のチップは、Ｉｒと、稀土
類金属酸化物とを焼結してサーメットとし、Ｉｒ等の母
相に稀土類酸化物を分散させることによりＩｒ等と酸素
との接触を阻止してＩｒ等の酸化揮発を防止した。これ
によりチップの酸化揮発に対する耐久性が更に向上でき
る。請求項４に記載の構成では、サーメット製のチップ
と外側電極母材との溶接強度が増大でき、母材とチップ
との溶接部のひび割れなどによるチップの脱落が防止で
きる。In a chip according to a third aspect of the present invention, Ir and rare earth metal oxide are sintered into a cermet, and the rare earth oxide is dispersed in a mother phase of Ir or the like to form Ir and oxygen. Contact was prevented to prevent oxidation and volatilization of Ir and the like. This can further improve the durability of the chip against oxidation and volatilization. With the structure according to the fourth aspect, the welding strength between the cermet tip and the outer electrode base material can be increased, and the tip can be prevented from falling off due to cracks in the welded portion between the base material and the tip.
【０００７】[0007]
【実施例】図１は、この発明にかかるスパークプラグを
示し、先端面に略Ｌ字形の外側電極１が溶接された筒状
の主体金具２内に、中心電極３を保持した絶縁碍子４を
嵌め込んでなる。この絶縁碍子４は軸穴４１を有し、主
体金具内周に設けた段座２１にパッキン２２を介して絶
縁碍子４の座面２３を係止し、主体金具頭部２４をかし
めることにより、主体金具２に固定されている。前記軸
穴４１には、先端側に前記中心電極３が、その先端部３
Ａが絶縁碍子４の先端より突出し、後端鍔部３Ｂが軸穴
４１の段部に当接して挿入されている。軸穴４１の後端
側には、導電性ガラスシール３３、３４、モノシリック
抵抗体３２を備えた中軸３１が加熱封着されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a spark plug according to the present invention, in which an insulator 4 holding a center electrode 3 is placed in a tubular metal shell 2 having a generally L-shaped outer electrode 1 welded to its tip surface. It fits in. The insulator 4 has a shaft hole 41, and the seat surface 23 of the insulator 4 is locked to the step seat 21 provided on the inner circumference of the metal shell via the packing 22, and the metal shell head 24 is caulked. , Is fixed to the metal shell 2. The center electrode 3 is provided on the tip side of the shaft hole 41, and the tip portion 3 thereof is provided.
A protrudes from the tip of the insulator 4, and the rear end flange 3B is inserted in contact with the step of the shaft hole 41. On the rear end side of the shaft hole 41, the center shaft 31 having the conductive glass seals 33 and 34 and the monolithic resistor 32 is heat-sealed.
【０００８】外側電極１は、図２に示すごとく、１５．
０重量％のクロム（Ｃｒ）、８．０重量％の鉄（Ｆｅ）
を含むＮｉ合金製で、巾２．８ｍｍ、厚さ１．５ｍｍの
矩形断面を有する母材１１と、母材１１の軸心部に埋め
込まれた銅（Ｃｕ）または銀（Ａｇ）を主体とする巾
１．２ｍｍ、厚さ０．７ｍｍの良熱伝導金属製の芯１２
を有する複合材（クラッド材）１０と、複合材１０の先
端の中心電極３側面に溶接されたチップ５とからなる。
芯１２は、外側電極の先端１Ａ付近から、主体金具に溶
接された基端１Ｂまで、母材１１と同軸的に設けられて
おり、先端部１２Ａは押出し成形により先端が楔状とな
っている。The outer electrode 1 is, as shown in FIG.
0 wt% chromium (Cr), 8.0 wt% iron (Fe)
The base material 11 is made of a Ni alloy containing Al and has a rectangular cross section with a width of 2.8 mm and a thickness of 1.5 mm, and copper (Cu) or silver (Ag) embedded in the axial center portion of the base material 11 is mainly used. A core 12 made of a good heat conductive metal having a width of 1.2 mm and a thickness of 0.7 mm.
And a tip 5 welded to the side surface of the center electrode 3 at the tip of the composite material 10.
The core 12 is provided coaxially with the base material 11 from the vicinity of the tip 1A of the outer electrode to the base 1B welded to the metal shell, and the tip 12A has a wedge-shaped tip formed by extrusion molding.
【０００９】この実施例では、チップ５は、Ｉｒの粉末
８５．０重量％と、稀土類金属酸化物であるイットリア
（ Ｙ2 ０3 ）の粉末１５．０重量％とを焼結した焼結
体からなる。この焼結体はＩｒの粒界にイットリアが入
り込んだサーメットとなっている。イットリアの添加量
は、０．１〜１５．０重量％であることが必要であり、
望ましくは４．０〜１０重量％の範囲が良い。またイッ
トリアの他にトリア（ＴｈＯ2 ）、酸化ランタン（Ｌａ
2 Ｏ3 ）など他の稀土類金属酸化物を用いることも可能
である。なおチップ５の溶接にレーザー溶接５Ａまたは
電子ビーム溶接を用い、チップ５の先部５１と母材１１
との接合面の全周を溶接するのは、ＩｒとＮｉ合金とは
溶接性が悪く、耐久性の高い溶接強度を得るためには溶
接面積を大きくする必要があるとともに、不活性ガスを
用いる溶接法では溶接の入熱が大きすぎて、ＩｒとＮｉ
合金全体が溶融してしまい、微細なエネルギー調整をす
ることができない為である。In this embodiment, the chip 5 is obtained by sintering 85.0% by weight of Ir powder and 15.0% by weight of powder of yttria (Y 2 O 3 ) which is a rare earth metal oxide. It consists of a body. This sintered body is a cermet in which yttria enters the grain boundary of Ir. The amount of yttria added must be 0.1 to 15.0% by weight,
It is preferably in the range of 4.0 to 10% by weight. In addition to yttria, thoria (ThO 2 ) and lanthanum oxide (La)
It is also possible to use other rare earth metal oxides such as 2 O 3 ). Laser welding 5A or electron beam welding is used to weld the tip 5, and the tip portion 51 of the tip 5 and the base metal 11 are welded.
Welding the entire circumference of the joint surface with is poor in weldability between Ir and Ni alloys, and it is necessary to increase the welding area in order to obtain welding strength with high durability, and an inert gas is used. With the welding method, the heat input of welding is too large, and Ir and Ni
This is because the entire alloy melts and fine energy adjustment cannot be performed.
【００１０】チップ５は、先部５１が直径１．０ｍｍと
径大で、基部５２が直径０．５ｍｍと径小の長さ１．０
ｍｍの円柱状を呈し、基部５２を母材１１の中心電極と
の対向面に設けた直径０．５ｍｍ，深さ０．５ｍｍの小
穴１３に嵌め込み、先部５１の外周と外側電極母材１１
との接合面を全周に沿ってレーザー溶接または電子ビー
ム溶接して固着されている。チップの基部５２の先端と
芯１２との距離Ｌは、図３の（イ）に示す如く、チップ
５の基部５２と芯１２と接触しているか、あるいは
（ロ）に示す如く距離Ｌが０．５ｍｍ以内に近接してい
ることが必要である。図４は、チップ５の基部５２の先
端と、芯１２の先端との距離と、チップ５の消耗量との
関係を示す実験データである。その結果、チップ５の封
入位置を０．５ｍｍ以内に近接させると酸化揮発主因の
チップの消耗が抑制され、優れた耐久性のスパークプラ
グを得ることができる。The tip 5 of the tip 5 has a large diameter of 1.0 mm and a base 52 of 0.5 mm and a small diameter of 1.0 mm.
It has a cylindrical shape of mm, and the base 52 is fitted into a small hole 13 having a diameter of 0.5 mm and a depth of 0.5 mm provided on the surface of the base material 11 facing the center electrode, and the outer periphery of the tip portion 51 and the outer electrode base material 11 are fitted.
The joint surface with and is fixed by laser welding or electron beam welding along the entire circumference. The distance L between the tip of the base portion 52 of the chip and the core 12 is either in contact with the base portion 52 of the chip 5 and the core 12 as shown in FIG. 3A, or the distance L is 0 as shown in FIG. It is necessary to be close within 0.5 mm. FIG. 4 is experimental data showing the relationship between the distance between the tip of the base 52 of the chip 5 and the tip of the core 12 and the amount of wear of the chip 5. As a result, when the enclosed position of the tip 5 is brought closer to within 0.5 mm, the consumption of the tip due to the oxidation volatilization is suppressed, and a spark plug having excellent durability can be obtained.
【００１１】またＩｒに他の金属として、Ｉｒ−Ｒｈ，
Ｉｒ−Ｒｅ合金等を用いることができ、さらにはこれら
の２以上を含む３元系、４元系としてもよく、この場合
においても稀土類金属酸化物の添加割合は上記範囲内に
あることが必要である。Further, as Ir other metal, Ir-Rh,
An Ir-Re alloy or the like can be used, and a ternary system or a quaternary system containing two or more of these may be used. In this case, the addition ratio of the rare earth metal oxide is also within the above range. is necessary.
【００１２】また、この発明の他の実施例として外側電
極１は、図５の（イ）に示す如く芯１２の軸芯に純Ｎｉ
または純Ｆｅ製の中芯１４を設けてもよく、この場合は
熱引きの低下を損なわず外側電極１の主体金具２への溶
接性の向上と、外側電極１自体の耐振性など機械的強度
の増大とが図れる。さらに、チップ５の形状は、図５の
（ロ）に示す如く、全体が同一直径の円柱状であっても
よい。As another embodiment of the present invention, the outer electrode 1 has pure Ni on the core of the core 12 as shown in FIG.
Alternatively, the core 14 made of pure Fe may be provided, and in this case, the weldability of the outer electrode 1 to the metal shell 2 is improved and the mechanical strength such as the vibration resistance of the outer electrode 1 itself is not impaired. Can be increased. Further, the shape of the tip 5 may be a cylindrical shape having the same diameter as a whole, as shown in FIG.
【図１】この発明のスパークプラグの断面図である。FIG. 1 is a sectional view of a spark plug of the present invention.
【図２】この発明のスパークプラグの先端面の拡大断面
図である。FIG. 2 is an enlarged sectional view of a front end surface of the spark plug of the present invention.
【図３】中心電極の先端部の拡大断面図である。FIG. 3 is an enlarged sectional view of a tip portion of a center electrode.
【図４】チップの耐久試験結果を示すグラフである。FIG. 4 is a graph showing a result of a durability test of a chip.
【図５】この発明の他の実施例を示す断面図である。FIG. 5 is a sectional view showing another embodiment of the present invention.
１ 外側電極 ２ 主体金具 ３ 中心電極 ４ 絶縁碍子 ５ 貴金属チップ １０ 複合材 １１ 母材 １２ 金属性芯 ５１ 先部 ５２ 基部 1 Outer electrode 2 Metal shell 3 Center electrode 4 Insulator 5 Precious metal tip 10 Composite material 11 Base material 12 Metal core 51 Tip part 52 Base part
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成３年１０月１６日[Submission date] October 16, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１０[Correction target item name] 0010
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１０】チップ５は、先部５１が直径１．０ｍｍと
径大で、基部５２が直径０．５ｍｍと径小の長さ１．０
ｍｍの円柱状を呈し、基部５２を母材１１の中心電極と
の対向面に設けた直径０．５ｍｍ，深さ０．５ｍｍの小
穴１３に嵌め込み、先部５１の外周と外側電極母材１１
との接合面を全周に沿ってレーザー溶接または電子ビー
ム溶接して固着されている。チップの基部５２の先端と
芯１２との距離Ｌは、図３の（イ）に示す如く、チップ
５の基部５２と芯１２と接触しているか、あるいは
（ロ）に示す如く距離Ｌが０．５ｍｍ以内に近接してい
ることが必要である。図４は、チップ５の基部５２の先
端と、芯１２の先端との距離と、チップ５の消耗量との
関係を示す実験データである。その結果、チップ５の封
入位置を０．５ｍｍ以内に近接させると酸化揮発主因の
チップの消耗が抑制され、優れた耐久性のスパークプラ
グを得ることができる。なお、実験は２０００ｃｃ×６
気筒のエンジンを用いて、５５００ｒｐｍ×全負荷の条
件で２００時間の耐久テストである。 The tip 5 of the tip 5 has a large diameter of 1.0 mm and a base 52 of 0.5 mm and a small diameter of 1.0 mm.
It has a cylindrical shape of mm, and the base 52 is fitted into a small hole 13 having a diameter of 0.5 mm and a depth of 0.5 mm provided on the surface of the base material 11 facing the center electrode, and the outer periphery of the tip portion 51 and the outer electrode base material 11 are fitted.
The joint surface with and is fixed by laser welding or electron beam welding along the entire circumference. The distance L between the tip of the base portion 52 of the chip and the core 12 is either in contact with the base portion 52 of the chip 5 and the core 12 as shown in FIG. 3A, or the distance L is 0 as shown in FIG. It is necessary to be close within 0.5 mm. FIG. 4 is experimental data showing the relationship between the distance between the tip of the base 52 of the chip 5 and the tip of the core 12 and the amount of wear of the chip 5. As a result, when the enclosed position of the tip 5 is brought closer to within 0.5 mm, the consumption of the tip due to the oxidation volatilization is suppressed, and a spark plug having excellent durability can be obtained. The experiment is 2000cc x 6
Using a cylinder engine, 5500 rpm x full load condition
It is a durability test of 200 hours.
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図２[Name of item to be corrected] Figure 2
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図２】 [Fig. 2]
Claims (4)
心電極との間に火花放電間隙を形成したスパークプラグ
において、 前記外側電極は、純ＮｉまたはＮｉ合金製の外側電極母
材にＣｕまたはＡｇを主体とする良熱伝導金属製芯を配
してなる複合材と、該複合材の中心電極側面に形成した
穴に、基部が前記母材中に埋設し、先部が突出してＩｒ
またはＩｒ合金である貴金属チップを嵌め込み、チップ
と芯との距離を０．５ｍｍ以下に設定するとともに、チ
ップと母材との接合面を溶接してなるスパークプラグ。1. A spark plug in which a spark discharge gap is formed between an outer electrode projecting from the tip of a metal shell and a center electrode, wherein the outer electrode is made of pure Ni or a Ni alloy and is made of Cu. Alternatively, a base material is embedded in the base material in a hole formed on the side surface of the center electrode of the composite material in which a core made of a good heat-conductive metal mainly containing Ag is disposed, and a tip portion is projected to make Ir project.
Alternatively, a spark plug obtained by fitting a noble metal tip made of an Ir alloy, setting the distance between the tip and the core to 0.5 mm or less, and welding the joining surface between the tip and the base material.
芯に、純Ｎｉまたは純Ｆｅ製の中芯を設けてなるスパー
クプラグ。2. The spark plug according to claim 1, wherein the outer electrode has a core made of pure Ni or pure Fe provided on a shaft core of the core.
１５．０重量％の稀土類金属酸化物と上記Ｉｒからなる
残余とを粉末焼結した貴金属サーメット製であるスパー
クプラグ。3. The chip according to claim 1, wherein the chip is 0.1 to 10.
A spark plug made of a noble metal cermet obtained by powder-sintering 15.0% by weight of a rare earth metal oxide and the balance consisting of Ir.
で、基部が径小の円柱状を呈し、先部外周と外側電極母
材との接合面を全周に沿ってレーザー溶接または電子ビ
ーム溶接したことを特徴とするスパークプラグ。4. The tip according to claim 3, wherein the tip has a cylindrical shape with a large diameter at the tip portion and a small diameter at the base portion, and laser welding or welding is performed along the entire circumference of the joint surface between the outer periphery of the tip portion and the outer electrode base material. Spark plug characterized by electron beam welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26412491A JP3192450B2 (en) | 1991-10-11 | 1991-10-11 | Spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26412491A JP3192450B2 (en) | 1991-10-11 | 1991-10-11 | Spark plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05101869A true JPH05101869A (en) | 1993-04-23 |
| JP3192450B2 JP3192450B2 (en) | 2001-07-30 |
Family
ID=17398815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26412491A Expired - Fee Related JP3192450B2 (en) | 1991-10-11 | 1991-10-11 | Spark plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3192450B2 (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0637113A1 (en) * | 1993-07-26 | 1995-02-01 | Ngk Spark Plug Co., Ltd | A spark plug |
| US5973443A (en) * | 1996-05-06 | 1999-10-26 | Alliedsignal Inc. | Spark plug electrode tip for internal combustion engine |
| US6094000A (en) * | 1995-06-15 | 2000-07-25 | Nippondenso Co., Ltd. | Spark plug for internal combustion engine |
| US6262522B1 (en) | 1995-06-15 | 2001-07-17 | Denso Corporation | Spark plug for internal combustion engine |
| EP1143587A2 (en) * | 2000-04-03 | 2001-10-10 | Denso Corporation | Spark plug for internal combustion engines and manufacturing method therof |
| US6710523B2 (en) | 2000-01-19 | 2004-03-23 | Ngk Spark Plug Co., Ltd. | Spark plug internal combustion engine |
| JP2005268222A (en) * | 2004-03-17 | 2005-09-29 | Robert Bosch Gmbh | Ignition plug |
| WO2008123342A1 (en) * | 2007-03-29 | 2008-10-16 | Ngk Spark Plug Co., Ltd. | Spark plug, and its manufacturing method |
| WO2009038001A1 (en) * | 2007-09-17 | 2009-03-26 | Ngk Spark Plug Co., Ltd. | Spark plug |
| WO2009037884A1 (en) * | 2007-09-18 | 2009-03-26 | Ngk Spark Plug Co., Ltd. | Spark plug |
| WO2009084575A1 (en) * | 2007-12-28 | 2009-07-09 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine |
| JP2009541946A (en) * | 2006-06-19 | 2009-11-26 | フェデラル−モーグル コーポレイション | Spark plug with extra fine wire ground electrode |
| US7781949B2 (en) | 2006-11-23 | 2010-08-24 | Ngk Spark Plug Co., Ltd. | Spark plug |
| US8013504B2 (en) | 2007-11-20 | 2011-09-06 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine and method for producing the spark plug |
| JP2020187907A (en) * | 2019-05-14 | 2020-11-19 | 日本特殊陶業株式会社 | Spark plug |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11837852B1 (en) * | 2022-07-27 | 2023-12-05 | Federal-Mogul Ignition Gmbh | Spark plug electrode with electrode tip directly thermally coupled to heat dissipating core and method of manufacturing the same |
-
1991
- 1991-10-11 JP JP26412491A patent/JP3192450B2/en not_active Expired - Fee Related
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0637113A1 (en) * | 1993-07-26 | 1995-02-01 | Ngk Spark Plug Co., Ltd | A spark plug |
| US6094000A (en) * | 1995-06-15 | 2000-07-25 | Nippondenso Co., Ltd. | Spark plug for internal combustion engine |
| US6262522B1 (en) | 1995-06-15 | 2001-07-17 | Denso Corporation | Spark plug for internal combustion engine |
| US5973443A (en) * | 1996-05-06 | 1999-10-26 | Alliedsignal Inc. | Spark plug electrode tip for internal combustion engine |
| US6710523B2 (en) | 2000-01-19 | 2004-03-23 | Ngk Spark Plug Co., Ltd. | Spark plug internal combustion engine |
| EP1143587A2 (en) * | 2000-04-03 | 2001-10-10 | Denso Corporation | Spark plug for internal combustion engines and manufacturing method therof |
| EP1143587A3 (en) * | 2000-04-03 | 2001-12-19 | Denso Corporation | Spark plug for internal combustion engines and manufacturing method therof |
| JP2005268222A (en) * | 2004-03-17 | 2005-09-29 | Robert Bosch Gmbh | Ignition plug |
| JP2009541946A (en) * | 2006-06-19 | 2009-11-26 | フェデラル−モーグル コーポレイション | Spark plug with extra fine wire ground electrode |
| US7781949B2 (en) | 2006-11-23 | 2010-08-24 | Ngk Spark Plug Co., Ltd. | Spark plug |
| JP4730747B2 (en) * | 2007-03-29 | 2011-07-20 | 日本特殊陶業株式会社 | Spark plug and manufacturing method thereof |
| JP2008270188A (en) * | 2007-03-29 | 2008-11-06 | Ngk Spark Plug Co Ltd | Spark plug and its manufacturing method |
| WO2008123342A1 (en) * | 2007-03-29 | 2008-10-16 | Ngk Spark Plug Co., Ltd. | Spark plug, and its manufacturing method |
| US8247740B2 (en) | 2007-03-29 | 2012-08-21 | Ngk Spark Plug Co., Ltd. | Spark plug, and its manufacturing method |
| WO2009038001A1 (en) * | 2007-09-17 | 2009-03-26 | Ngk Spark Plug Co., Ltd. | Spark plug |
| US8217561B2 (en) | 2007-09-17 | 2012-07-10 | Ngk Spark Plug Co., Ltd. | Spark plug having laminated ground electrode |
| WO2009037884A1 (en) * | 2007-09-18 | 2009-03-26 | Ngk Spark Plug Co., Ltd. | Spark plug |
| JP4912459B2 (en) * | 2007-09-18 | 2012-04-11 | 日本特殊陶業株式会社 | Spark plug |
| US8288929B2 (en) | 2007-09-18 | 2012-10-16 | Ngk Spark Plug Co., Ltd. | Spark plug |
| US8013504B2 (en) | 2007-11-20 | 2011-09-06 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine and method for producing the spark plug |
| WO2009084575A1 (en) * | 2007-12-28 | 2009-07-09 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine |
| US8640666B2 (en) | 2007-12-28 | 2014-02-04 | Ngk Spark Plug Co., Ltd. | Spark plug for internal combustion engine |
| JP2020187907A (en) * | 2019-05-14 | 2020-11-19 | 日本特殊陶業株式会社 | Spark plug |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3192450B2 (en) | 2001-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3327941B2 (en) | Spark plug | |
| JPH05101869A (en) | Spark plug | |
| CA2376980C (en) | Spark plug shell having a bimetallic ground electrode, spark plug incorporating the shell, and method of making same | |
| EP1576707B1 (en) | Ignition device having an electrode formed from an iridium-based alloy | |
| JP4402046B2 (en) | Spark plug | |
| JPH0737674A (en) | Spark plug | |
| JPH05234662A (en) | Electrode for spark plug and its manufacture | |
| JP2003142226A (en) | Spark plug | |
| CN111247706B (en) | Spark plug for internal combustion engine | |
| JPH0668955A (en) | Spark plug and manufacture thereof | |
| JPH09298083A (en) | Spark plug for internal combustion engine | |
| JPH1197151A (en) | Spark plug | |
| JPH0750627B2 (en) | Method for manufacturing spark plug for internal combustion engine | |
| KR101168204B1 (en) | Ignition device having an electrode tip formed from an iridium-based alloy | |
| JPH0554953A (en) | Spark plug | |
| JP4295064B2 (en) | Spark plug | |
| JP2003529198A (en) | Spark plugs for internal combustion engines | |
| JP2853109B2 (en) | Spark plug manufacturing method | |
| JP4614207B2 (en) | Spark plug | |
| JP4015808B2 (en) | Spark plug for internal combustion engine and method for manufacturing the same | |
| JPH05159857A (en) | Spark plug for gaseous fuel engine | |
| JPH05159856A (en) | Spark plug | |
| JPH0582236A (en) | Multipolar spark plug | |
| JPH0567488A (en) | Spark plug | |
| JP4291484B2 (en) | Spark plug and method of manufacturing spark plug |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080525 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090525 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090525 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090525 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100525 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100525 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110525 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110525 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |