JPH0261973A - Spark plug for internal combustion engine - Google Patents
Spark plug for internal combustion engineInfo
- Publication number
- JPH0261973A JPH0261973A JP21160688A JP21160688A JPH0261973A JP H0261973 A JPH0261973 A JP H0261973A JP 21160688 A JP21160688 A JP 21160688A JP 21160688 A JP21160688 A JP 21160688A JP H0261973 A JPH0261973 A JP H0261973A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- hole
- center electrode
- spark plug
- noble metal
- 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 16
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000010304 firing Methods 0.000 claims description 38
- 239000010970 precious metal Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 8
- 229910000990 Ni alloy Inorganic materials 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 239000012212 insulator Substances 0.000 description 3
- 229910002845 Pt–Ni Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- 229910002835 Pt–Ir Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910001055 inconels 600 Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance 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関
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、内燃機関の窩出力化に伴って、内燃機関用スパー
クプラグの耐久性が求められており、このため、中心電
極の先端に耐摩耗性に優れた貴金属からなる発火部電極
を、電気抵抗溶接法あるいはレーザー溶接法等によって
接合してなるものがある。(Prior art) In recent years, with the increase in the output power of internal combustion engines, durability of spark plugs for internal combustion engines has been required. Some are made by joining electrodes by electric resistance welding, laser welding, or the like.
（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、中心電極の先
端に耐摩耗性に優れた貴金属からなる発火部電極を、電
気抵抗溶接法あるいはレーザー溶接法等によって接合す
る場合、製造工程上の時間を多く必要とするものであり
、さらに、レーザー溶接の場合、溶接に使用するレーザ
ーが高エネルギーであることから、その設定条件を決め
ることが非常に難しく、また、溶接に必要とされる溶接
治工具の管理等にも、人員を割かねばならないので、コ
ストの著しい上昇を生じ、量産する上においての困難な
問題を抱えているものである。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とともに、コストの低
いプレス加工による接合法等を用いて、■摩耗性に優れ
た貴金属合金による発火部電極を有する内燃機関用スパ
ークプラグを提供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 the firing part electrode made of a noble metal with excellent wear resistance is joined to the tip of the center electrode by electric resistance welding or laser welding, It requires a lot of time in the manufacturing process, and in the case of laser welding, the laser used for welding has high energy, so it is very difficult to determine the setting conditions. Since it is necessary to allocate human resources to manage the welding jigs and tools, etc., this results in a significant increase in cost and poses a difficult problem in mass production. Therefore, the present invention improves the drawbacks of the above-mentioned conventional spark plugs, and uses a low-cost joining method such as press working to provide a spark plug for internal combustion engines that has an ignition part electrode made of a noble metal alloy with excellent wear resistance. 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、ニッケル合金よりなる中心電極の先端に穿
設する孔部中に、外周に複数の溝部を周設する円筒状の
貴金属からなる発火部電極を挿嵌するときに、先ず、中
心電極の先端に穿設する孔部と挿嵌する貴金属からなる
発火部電極との間隙を０．０５ｍｍ以下とし、また、上
記中心電極の硬度Ｈｖ１７０以下、発火部電極として使
用する貴金属を硬度Ｈｖ１５０以上のものとし、更には
、発火部電極の外周に周設されてなる複数の溝部のうち
、少なくとも２つ以上中心電極の孔部中に埋設し、中心
電極の孔部中に挿嵌される、発火部電極の直径Ａを、０
．５≦Ａ≦１．０ｍｍ、溝範囲Ｂを、Ｂ≦０．６ｍｍ、
溝幅Ｃを、０．０３≦Ｃ≦０．０８ｍｍ、溝深りを、０
．０３≦Ｄ≦００６ｍｍ、溝間隔Ｅを、Ｅ≦０．０５ｍ
ｍとしてなるものを、中心電極の孔部中に挿嵌した後、
上記発火部電極を挿嵌する中心電極の孔部の周縁に三軸
圧縮応力を加えることによって、中心電極の孔部の内周
壁を塑性変形させ、貴金属からなる発火部電極の外周に
周設されてなる複数の溝部に圧入して充填、接合させ、
その上、複数の溝部に充填する、塑性変形した中心電極
の孔部の内周壁に対して熱処理な加えることによって、
貴金属からなる発火部電極の外周との合金層を形成させ
てなるものである。(Means for solving the problem) To achieve this, a cylindrical firing part electrode made of a noble metal with a plurality of grooves around its outer periphery is inserted into a hole drilled at the tip of a center electrode made of a nickel alloy. When doing so, first, the gap between the hole drilled at the tip of the center electrode and the firing part electrode made of a noble metal to be inserted is set to 0.05 mm or less, and the hardness of the center electrode is Hv170 or less, and the firing part electrode is The precious metal used has a hardness of Hv150 or more, and furthermore, at least two or more of the plurality of grooves provided around the outer periphery of the firing part electrode are embedded in the hole of the center electrode, and the hole of the center electrode is The diameter A of the firing part electrode inserted into the
．． 5≦A≦1.0mm, groove range B, B≦0.6mm,
The groove width C is 0.03≦C≦0.08mm, and the groove depth is 0.
．． 03≦D≦006mm, groove interval E, E≦0.05m
After inserting what becomes m into the hole of the center electrode,
By applying triaxial compressive stress to the periphery of the hole of the center electrode into which the firing part electrode is inserted, the inner circumferential wall of the hole of the center electrode is plastically deformed. Press fit into multiple grooves to fill and join.
Furthermore, by applying heat treatment to the inner peripheral wall of the hole of the center electrode which is plastically deformed and filling the plurality of grooves,
It is formed by forming an alloy layer with the outer periphery of the firing part electrode made of noble metal.
（作用）
上記構成を具えるのて、ニッケル合金よりなり硬度Ｈｖ
１７０以下である中心電極の先端に設ける孔部中に、硬
度Ｈｖが１５０以上である外周に複数の溝部を周設する
円筒状貴金属の発火部電極を挿嵌した後、中心電極の孔
部の周縁に三軸圧縮応力を加えることによって、硬度Ｈ
ｖが１７０以下である中心電極の孔部の内周壁が貴金属
の発火部１瘉の外周に設ける溝部に対して、塑性変形を
起こし、上記ニッケル合金からなる中心電極の孔部の内
周壁の材料が溝部に正大充填されることにより接合し、
さらには、塑性変形した中心電極の孔部の内周壁に対し
て熱処理を加えることによって、貴金属からなる発火部
電極の外周との間に合金層を形成させることができるの
で、より強固に接合させることができる。(Function) With the above configuration, it is made of nickel alloy and has a hardness of Hv.
After inserting a firing electrode made of a cylindrical noble metal with a plurality of grooves around the outer periphery and having a hardness Hv of 150 or more into a hole provided at the tip of a center electrode having a hardness of 170 or less, By applying triaxial compressive stress to the periphery, the hardness H
The inner circumferential wall of the hole in the center electrode where v is 170 or less causes plastic deformation with respect to the groove provided on the outer periphery of the noble metal firing part 1, and the material of the inner circumferential wall of the hole in the center electrode made of the above-mentioned nickel alloy is joined by filling the groove part to the right size,
Furthermore, by applying heat treatment to the inner peripheral wall of the hole in the center electrode that has been plastically deformed, it is possible to form an alloy layer between it and the outer periphery of the firing part electrode made of noble metal, resulting in a stronger bond. be able to.
（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
、この考案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２プラグ（１〉は、ニッケ
ル合金（例えばインコネル６００等）或は５１−Ｃｒ−
Ｍｎ−９５％Ｎ１からなり、かつ、その内部に銅芯が封
入されており、先端部に設ける孔部（４）に、外周に複
数の溝部（６）を周設する貴金属（例えば、Ｐｔ、Ａｕ
−Ｐｄ合金、Ｐｔ−Ｉｒ合金、Ｐｔ−Ｎｉ合金、Ｉｒ或
はＰ ｔ ／ Ｎ ｉクラッドワイヤー等）よりなる円
筒状の発火部電極（５）を接合、固定してなり、この中
心電極（３〉を嵌挿、保持する絶縁体（２）、先端にネ
ジ部（８〉を具える主体金具（７）及び外側電極（９）
から構成されるものである。この中心電極（３）の先端
部に設けた孔部く４）に接合の上、固定される円筒状の
貴金属よりなる発火部電極く５）は、その孔部（４）と
の間に０．０５ｍｍ以下の間隙をもって嵌挿され、上記
中心電極の硬度Ｈｖを１７０以下、さらに発火部電極（
５）に用いられる貴金属の硬度Ｈｖを１５０以上として
なるものであり、中心電極（３）の硬度が１７０以上だ
と中心電極の塑性変形が不十分となって溝部（６）に完
全に吸い込むことができず間隙が生じ、また発火電極（
５）の硬度が１５０以下だと発火電極が変形を生じて強
固な接合力が得られない。製造工程としては中心電極（
３）の先端部の孔部（４）に、上記貴金属よりなる円筒
状の発火部電極（５）を嵌挿した後、中心電極（３）の
孔部（４）の周縁に、治具（１５）によって固定し、そ
の治具（１６）及びガイド（１７）に嵌合するポンチ（
１６）によって上記発火部電極（５）の周囲に三軸圧縮
応力（矢印方向）を加え、硬度Ｈｖ１７０以下である中
心電極（３）の孔部（４）の内壁（１０）に塑性変形を
生じさせ、上記貴金属よりなる円筒状の発火部電極（５
）の外周に周設した複数の溝部（６）の中に中心電極（
３）の内壁の材料が圧入充填されることによって、接合
面に対して圧縮による残留応力が残り、発火部電極（５
）は中心電極〈３）に強固に接合、固定されるものであ
る。そして、中心電極（３）の先端部の孔部（４）の中
に嵌挿される貴金属の円筒状発火部電極（５）の外周に
周設された溝部（６）は、少なくとも２山以上孔部（４
）内に埋設することによって、治具（１５）及びポンチ
（１６）によって三軸圧縮応力を加えることで生じる発
火部電極（５）との接合がより確実になると共に、上記
発火部電極（５）の寸法を、直径Ａを、０．５≦Ａ≦１
．０ｍｍ、溝部（６）の範囲Ｂを、Ｂ≦０．６ｍｍ、溝
部（６）の幅Ｃを、０．０３≦Ｃ≦０．０８ｍｍ、７７
４部（６）の深さＤを、０．０３≦Ｄ≦０．０６ｍｍ、
溝部（６）の間隔Ｅを、Ｅ≦０．０５ｍｍとすることに
よって、塑性変形による溝部（６）への充填が最適なも
のとなり、十分な接合強度を得ることができる。また、
中心電極く３）の先端部に設けられる孔部（４）の中に
貴金属よりなる円筒状の発火部電極（５）を挿嵌した後
、三軸圧縮応力を加えることで起こる塑性変形による溝
部（６）への中心電極材料の圧入充填と共に、１ｏｏｏ
℃で２時間熱処理を施すことによって、中心電極（３）
の孔部（４）の内壁く１０）と貴金属よりなる円筒状の
発火部電極（５）の外周との間に、例えばＰｔ−Ｎｉの
合金層（１４）が形成され、より強固な接合ができるも
のである。そこで、この発明の実施例である内燃機関用
スパークプラグ（１）を６気筒、２０００ｃｃの実機エ
ンジンに組み込み、アイドリング（１分間）から全開５
０００ｒｐｍ （１分間）繰り返す冷熱繰り返し試験を
２００時間行ったところ、剥離等の異常が発生すること
もなく、この発明の効果が認められた。なお、発火部電
極（５）の外周に設けられる溝部く６）のポンチによる
加工は、一部或は全周にわたっても良いものであり、さ
らにローレット加工としても良いものである。なお、（
１１）は、導電性ガラスであり、抵抗体（１２〉を挟持
して、端子電極（１３）と共に、絶縁体（２）内に加熱
封着されているものである。(Example) This invention will be further explained with reference to an example shown in the drawings. (1) is a spark plug for an internal combustion engine which is an example of this invention, and this spar 2 plug for an internal combustion engine (1> is a nickel alloy (for example, Inconel 600, etc.) or 51-Cr-
A noble metal (such as Pt, Au
-Pd alloy, Pt-Ir alloy, Pt-Ni alloy, Ir or Pt/Ni clad wire, etc.) is bonded and fixed to the cylindrical firing part electrode (5), and this center electrode (3 〉 is inserted into and held insulator (2), main metal fitting (7) with threaded part (8〉) at the tip, and outer electrode (9)
It consists of: A firing part electrode 5) made of a cylindrical noble metal is bonded and fixed to the hole 4) provided at the tip of the center electrode (3), and the firing part electrode 5) is connected to the hole 4). The hardness of the center electrode is set to 170 or less, and the firing part electrode (
The hardness of the precious metal used in step 5) is 150 or more, and if the hardness of the center electrode (3) is 170 or more, the plastic deformation of the center electrode will be insufficient and it will be completely sucked into the groove (6). This creates a gap, and the ignition electrode (
If the hardness of 5) is less than 150, the firing electrode will be deformed and a strong bonding force will not be obtained. As for the manufacturing process, the center electrode (
After inserting the cylindrical firing electrode (5) made of the noble metal into the hole (4) at the tip of the center electrode (3), insert a jig ( 15), and the punch (16) and guide (17)
16), a triaxial compressive stress (in the direction of the arrow) is applied around the firing part electrode (5) to cause plastic deformation in the inner wall (10) of the hole (4) of the center electrode (3), which has a hardness of Hv170 or less. and a cylindrical firing part electrode (5
) The center electrode (
By press-fitting the inner wall material of 3), residual stress due to compression remains on the joint surface, and the firing part electrode (5)
) is firmly joined and fixed to the center electrode <3). The groove (6) provided around the outer periphery of the noble metal cylindrical firing electrode (5) that is inserted into the hole (4) at the tip of the center electrode (3) has at least two or more holes. Part (4
), the connection with the firing part electrode (5) caused by applying triaxial compressive stress with the jig (15) and punch (16) becomes more reliable, and the firing part electrode (5) is buried in the firing part electrode (5). ), the diameter A is 0.5≦A≦1
．． 0mm, the range B of the groove (6) is B≦0.6mm, the width C of the groove (6) is 0.03≦C≦0.08mm, 77
The depth D of part 4 (6) is 0.03≦D≦0.06 mm,
By setting the interval E of the grooves (6) to E≦0.05 mm, the filling of the grooves (6) by plastic deformation becomes optimal, and sufficient bonding strength can be obtained. Also,
A groove formed by plastic deformation caused by applying triaxial compressive stress after inserting a cylindrical firing electrode (5) made of precious metal into a hole (4) provided at the tip of the center electrode (3). Along with press-fitting the center electrode material into (6), 1ooo
By heat treatment for 2 hours at °C, the center electrode (3)
An alloy layer (14) of, for example, Pt-Ni is formed between the inner wall (10) of the hole (4) and the outer periphery of the cylindrical firing electrode (5) made of noble metal, resulting in a stronger bond. It is possible. Therefore, the spark plug (1) for an internal combustion engine, which is an embodiment of the present invention, was installed in a 6-cylinder, 2000cc actual engine, and the spark plug (1) was installed in a 6-cylinder, 2000cc actual engine.
When a cold/heat cycle test was conducted at 000 rpm (1 minute) for 200 hours, no abnormalities such as peeling occurred, demonstrating the effectiveness of the present invention. Note that the groove 6) provided on the outer periphery of the firing part electrode (5) may be punched partially or entirely, and may also be knurled. In addition,(
Reference numeral 11) is conductive glass, which is heat-sealed within the insulator (2) together with the terminal electrode (13) with the resistor (12>) sandwiched therebetween.
（発明の効果）
以上のとおり、ニッケル合金による中心電極の先端部に
設ける孔部に、貴金属からなり、外周に溝部を周設した
発火部電極を挿嵌し、その周囲に圧縮応力を加えること
によって、中心電極に対して塑性変形をおこさせ、上記
発火部電極外周に周設した溝部内に中心電極材を圧入充
填させることで、接合させ、プレス機を用いた簡単な方
法により接合を行えるものであり、さらにイリジウム等
の高融点物質に対してもスパークプラグの発火部電極と
して使用することが可能となり、耐ｊ＊耗性に優れたス
パークプラグを提供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, a firing part electrode made of a noble metal and having a groove around its outer periphery is inserted into a hole provided at the tip of a center electrode made of a nickel alloy, and compressive stress is applied around the firing part electrode. By causing plastic deformation to the center electrode and press-fitting the center electrode material into the groove provided around the outer periphery of the firing section electrode, the bonding can be performed by a simple method using a press machine. Furthermore, it can be used as the ignition part electrode of spark plugs even for high melting point substances such as iridium, and has the excellent effect of providing spark plugs with excellent wear resistance. It is something.
第１図は、この発明の実施例である内燃機関用スパーク
プラグの部分断面図、第２図は、その要部拡大断面図、
さらに第３図は、実施例である内燃機関用スパークプラ
グの要部製造工程を示す断面図である。
１・・・内燃機関用スパークプラグ ２・・・絶縁体３
・・・中心電［！ ４・・・孔部 ５・・・発火部電極
６・・・溝部 ７・・・主体金具 ８・・・ネジ部 ９
・・・外側電極 １０・・・内壁 １１・・・導電性ガ
ラス１２・・・抵抗体 １３・・・端子電極 １４・・
・合金層１５・・・治具 １６・・・ポンチ
特許出願人 代理人 弁理士 藤 木 三 幸第２図
ｒイノ
６口）
ｌ Ａ 、、、、、、、、、１
第３図FIG. 1 is a partial sectional view of a spark plug for an internal combustion engine, which is an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of its main parts.
Further, FIG. 3 is a cross-sectional view showing a manufacturing process of a main part of a spark plug for an internal combustion engine according to an embodiment. 1...Spark plug for internal combustion engine 2...Insulator 3
... Chuoden [! 4... Hole 5... Firing part electrode 6... Groove 7... Metal shell 8... Threaded part 9
...Outer electrode 10...Inner wall 11...Conductive glass 12...Resistor 13...Terminal electrode 14...
・Alloy layer 15...Jig 16...Punch Patent applicant Agent Patent attorney Miyuki Fujiki Figure 2 r Ino 6) l A , , , , , , , 1 Figure 3
Claims (5)
挿嵌した後、上記発火部電極を挿嵌する中心電極の孔部
の周縁に三軸圧縮応力を加えることによって、中心電極
の孔部の内周壁を塑性変形させ、貴金属からなる発火部
電極の外周に周設されてなる複数の溝部に圧入充填、接
合させてなる内燃機関用スパークプラグ。(1) After inserting the firing part electrode made of a noble metal into the hole of the center electrode, triaxial compressive stress is applied to the periphery of the hole of the center electrode into which the firing part electrode is inserted. A spark plug for an internal combustion engine in which the inner circumferential wall of a hole is plastically deformed, and the spark plug is press-fitted and joined into a plurality of grooves provided around the outer periphery of an ignition part electrode made of a noble metal.
貴金属からなる発火部電極との間隙を０．０５ｍｍ以下
とすると共に、上記中心電極の硬度Ｈｖ１７０以下、発
火部電極として使用する貴金属を硬度Ｈｖ１５０以上と
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 gap between the hole provided at the tip of the center electrode and the firing part electrode made of a noble metal inserted into the hole is 0.05 mm or less, and the hardness of the center electrode is Hv170 or less, and it is used as the firing part electrode. The spark plug for an internal combustion engine according to claim (1), wherein the spark plug is made of a precious metal having a hardness of Hv150 or more.
る複数の溝部のうち、少なくとも２つ以上中心電極の孔
部中に埋設されてなる請求項（１）記載の内燃機関用ス
パークプラグ。(3) A spark plug for an internal combustion engine according to claim (1), wherein at least two of the plurality of grooves formed around the outer periphery of the firing part electrode made of a noble metal are embedded in the hole of the center electrode. .
発火部電極の直径Ａを、０．５≦Ａ≦１．０ｍｍ、溝範
囲Ｂを、Ｂ≦０．６ｍｍ、溝幅Ｃを、０．０３≦Ｃ≦０
．０８ｍｍ、溝深Ｄを、０．０３≦Ｄ≦０．０６ｍｍ、
溝間隔Ｅを、Ｅ≦０．０５ｍｍとしてなる請求項（１）
、（２）又は（３）記載の内燃機関用スパークプラグ。(4) The diameter A of the firing part electrode made of noble metal, which is inserted into the hole of the center electrode, is 0.5≦A≦1.0mm, the groove range B is B≦0.6mm, and the groove width C , 0.03≦C≦0
．． 08mm, groove depth D, 0.03≦D≦0.06mm,
Claim (1) wherein the groove interval E is E≦0.05 mm.
, (2) or (3).
孔部の内周壁に対して熱処理を加えることによって、貴
金属からなる発火部電極の外周との合金層を形成させて
なる請求項（１）、（２）、（３）又は、（４）記載の
内燃機関用スパークプラグ。(5) A claim in which an alloy layer is formed with the outer periphery of the firing section electrode made of a noble metal by applying heat treatment to the inner circumferential wall of the hole of the plastically deformed center electrode that fills the plurality of grooves. The spark plug for an internal combustion engine according to 1), (2), (3) or (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21160688A JPH0261973A (en) | 1988-08-27 | 1988-08-27 | Spark plug for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21160688A JPH0261973A (en) | 1988-08-27 | 1988-08-27 | Spark plug for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0261973A true JPH0261973A (en) | 1990-03-01 |
Family
ID=16608548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21160688A Pending JPH0261973A (en) | 1988-08-27 | 1988-08-27 | Spark plug for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0261973A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994011934A1 (en) * | 1992-11-19 | 1994-05-26 | Robert Bosch Gmbh | Spark plug for internal combustion engines, in particular for motor vehicle internal combustion engines |
| EP1286442A1 (en) * | 2001-08-23 | 2003-02-26 | Federal-Mogul S.A. | A spark plug for an internal combustion engine |
| US7323811B2 (en) | 2001-08-23 | 2008-01-29 | Federal-Mogul Ignition (U.K.) Limited | Noble metal tip for spark plug electrode and method of making same |
| JP2019046660A (en) * | 2017-09-02 | 2019-03-22 | 日本特殊陶業株式会社 | Spark plug |
-
1988
- 1988-08-27 JP JP21160688A patent/JPH0261973A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994011934A1 (en) * | 1992-11-19 | 1994-05-26 | Robert Bosch Gmbh | Spark plug for internal combustion engines, in particular for motor vehicle internal combustion engines |
| EP1286442A1 (en) * | 2001-08-23 | 2003-02-26 | Federal-Mogul S.A. | A spark plug for an internal combustion engine |
| WO2003019746A2 (en) * | 2001-08-23 | 2003-03-06 | Federal-Mogul S.A. | A spark plug for an internal combustion engine |
| WO2003019746A3 (en) * | 2001-08-23 | 2007-10-25 | Federal Mogul Sa | A spark plug for an internal combustion engine |
| US7323811B2 (en) | 2001-08-23 | 2008-01-29 | Federal-Mogul Ignition (U.K.) Limited | Noble metal tip for spark plug electrode and method of making same |
| KR100899718B1 (en) * | 2001-08-23 | 2009-05-27 | 페더랄-모굴 에스.아. | A spark plug for an internal combustion engine |
| JP2019046660A (en) * | 2017-09-02 | 2019-03-22 | 日本特殊陶業株式会社 | Spark plug |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3301094B2 (en) | Spark plug for internal combustion engine and method of manufacturing the same | |
| EP1341282A3 (en) | Method of making a spark plug | |
| GB1425126A (en) | Manufacture of spark plug electrides | |
| US20060103284A1 (en) | Spark plug with ground electrode having mechanically locked precious metal feature | |
| US7115836B2 (en) | Glow plug | |
| JP4104459B2 (en) | Manufacturing method of spark plug | |
| JP4147152B2 (en) | Spark plug and method of manufacturing spark plug | |
| JP4680513B2 (en) | Spark plug manufacturing method and spark plug | |
| JPH0261973A (en) | Spark plug for internal combustion engine | |
| JP3272489B2 (en) | Spark plug manufacturing method | |
| JP3131984B2 (en) | Method of manufacturing spark plug for internal combustion engine | |
| JPH0375994B2 (en) | ||
| JP2000040577A (en) | Spark plug and its manufacture | |
| JP3272488B2 (en) | Spark plug manufacturing method | |
| JPH03176979A (en) | Spark plug for internal combustion engine | |
| JP3050245B2 (en) | Spark plug manufacturing method | |
| JP3413643B2 (en) | Spark plug manufacturing method | |
| JP7085461B2 (en) | Glow plugs and methods for manufacturing glow plugs | |
| JPH0734387B2 (en) | Spark plug for internal combustion engine | |
| JPS61171080A (en) | Ingnition plug | |
| JPH03149788A (en) | Manufacture of ignition plug for internal combustion engine | |
| JP5102802B2 (en) | Manufacturing method of pressure sensor | |
| JPWO2024038511A5 (en) | ||
| JPS62267029A (en) | Manufacture of built-up camshaft | |
| JP3486950B2 (en) | Spark plug manufacturing method |