JPH0570274B2 - - Google Patents
Info
- Publication number
- JPH0570274B2 JPH0570274B2 JP11656184A JP11656184A JPH0570274B2 JP H0570274 B2 JPH0570274 B2 JP H0570274B2 JP 11656184 A JP11656184 A JP 11656184A JP 11656184 A JP11656184 A JP 11656184A JP H0570274 B2 JPH0570274 B2 JP H0570274B2
- Authority
- JP
- Japan
- Prior art keywords
- chip
- spark plug
- stress relaxation
- layer
- relaxation layer
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 229910000510 noble metal Inorganic materials 0.000 claims description 18
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 230000003746 surface roughness Effects 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 4
- 238000007740 vapor deposition Methods 0.000 claims description 3
- 229910001020 Au alloy Inorganic materials 0.000 claims description 2
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 239000003353 gold alloy Substances 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims 3
- 238000004381 surface treatment Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 60
- 230000035882 stress Effects 0.000 description 39
- 239000000463 material Substances 0.000 description 9
- 238000005304 joining Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910001260 Pt alloy Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 229910000575 Ir alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Landscapes
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は内燃機関用スパークプラグの製造方法
に関し、特に発火部に耐久性を向上させるため
に、貴金属の放電部層と応力緩和層とを有するチ
ツプが設けられているスパークプラグの製造方法
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of manufacturing a spark plug for an internal combustion engine, and in particular, in order to improve the durability of the ignition part, a noble metal discharge part layer and a stress relaxation layer are added. The present invention relates to a method of manufacturing a spark plug provided with a chip having the following properties.
従来の内燃機関用スパークプラグは、第９図に
その主要部を示すように、中心電極１及び接地電
極３の発火部に貴金属チツプ２が設けられてい
る。この貴金属チツプは、白金とイリジウムの合
金、白金とタングステンの合金もしくは白金とイ
リジウムに若干のニツケルを添加した合金から成
る単一体により構成されその線膨張係数は８〜９
×10-6／℃である。一方にこのチツプが接合され
ている中心電極１の母材はニツケル基耐熱合金で
あつてその線膨張係数は13〜14×10-6／℃である
ため、チツプ２と母材との接合界面４では約５×
10-6／℃の線膨張係数の差がある合金どうしが接
合されていることになる。スパークプラグは、高
負荷あるいは低負荷等々の種々の運転条件下で高
温度と低温度が繰返される厳しい環境にさらされ
るため、上記の線膨張係数の差と冷熱の繰返しに
より接合界面４に熱応力が繰返し発生し、接合界
面あるいはその近傍には第５図及び第６図に示す
ような横亀裂５ａ及び／あるいは酸化腐食５ｂが
生じ貴金属チツプ２が早期に脱落するという欠点
があつた。火花位置(L)が３〜７mm程度突出した形
状（第１０図）ではこの欠点は特に顕著となる。
As shown in FIG. 9, a conventional spark plug for an internal combustion engine has a noble metal chip 2 provided in the ignition portion of a center electrode 1 and a ground electrode 3. As shown in FIG. This precious metal chip is composed of a single body consisting of an alloy of platinum and iridium, an alloy of platinum and tungsten, or an alloy of platinum and iridium with a small amount of nickel added, and its coefficient of linear expansion is 8 to 9.
×10 -6 /℃. On the other hand, the base material of the center electrode 1 to which this chip is bonded is a nickel-based heat-resistant alloy, and its coefficient of linear expansion is 13 to 14 x 10 -6 /°C, so the bonding interface between the chip 2 and the base metal is 4 is about 5×
This means that alloys with a difference in linear expansion coefficient of 10 -6 /°C are joined together. Spark plugs are exposed to harsh environments in which high and low temperatures are repeated under various operating conditions such as high load or low load, so thermal stress is generated at the joint interface 4 due to the difference in linear expansion coefficient and repeated cooling and heating. This occurs repeatedly, and transverse cracks 5a and/or oxidative corrosion 5b as shown in FIGS. 5 and 6 occur at or near the bonding interface, causing the precious metal chips 2 to fall off at an early stage. This defect is particularly noticeable in the shape (FIG. 10) in which the spark position (L) protrudes by about 3 to 7 mm.
この従来スパークプラグの欠点を改善するため
本出願人はスパークプラグのチツプを第７図に示
すように貴金属から成る放電部層と、この放電部
層の熱膨張係数の値と母材の線膨張係数の値との
中間の値の線膨張係数を有する応力緩和層とから
成る円柱状のチツプとし、この応力緩和層を中心
電極の母材に接合させることにより「スパークプ
ラグのチツプ脱落」という問題を改善している。 In order to improve this drawback of the conventional spark plug, the present applicant has developed a spark plug chip with a discharge layer made of a noble metal, a thermal expansion coefficient of the discharge layer, and a linear expansion of the base material as shown in FIG. By creating a cylindrical chip consisting of a stress relaxation layer having a coefficient of linear expansion that is between the value of the coefficient and the value of the coefficient, and bonding this stress relaxation layer to the base material of the center electrode, the problem of "spark plug chip falling off" can be solved. are improving.
上記円柱状の複合チツプを有するスパークプラ
グを製造する場合、第８図に示すチツプの応力緩
和層の表面８を中心電極の母材１に抵抗溶接等で
接合していたが、応力緩和層の表面８と貴金属製
放電部層の表面７との識別が困難であり、スパー
クプラグの製造時に貴金属放電部層の表面７が中
心電極の母材１に接合される恐れがあつた。もし
貴金属製放電部層表面７が母材１に接合されると
上記亀裂あるいは酸化物発生によるチツプの早期
脱落という問題が生じスパークプラグの信頼性が
低下する。
When manufacturing a spark plug having the above-mentioned cylindrical composite chip, the surface 8 of the stress relaxation layer of the chip shown in FIG. 8 was joined to the base material 1 of the center electrode by resistance welding or the like. It was difficult to distinguish between the surface 8 and the surface 7 of the noble metal discharge layer, and there was a risk that the surface 7 of the noble metal discharge layer would be joined to the base material 1 of the center electrode during manufacture of the spark plug. If the surface 7 of the noble metal discharge layer is joined to the base material 1, there will be a problem that the chips will come off early due to the above-mentioned cracks or the generation of oxides, reducing the reliability of the spark plug.
本発明は、貴金属製放電部層と応力緩和層とを
有するチツプにおける応力緩和層側の面を確実に
識別且つ接合しそれによりチツプの母材への接合
作業の信頼性を確保した、内燃機関用スパークプ
ラグの製造方法を得ることである。
The present invention provides an internal combustion engine that reliably identifies and joins the stress relaxation layer side surface of a chip having a noble metal discharge layer and a stress relaxation layer, thereby ensuring the reliability of the joining operation of the chip to the base material. An object of the present invention is to obtain a method for manufacturing a spark plug for use in a car.
上記目的を達成するため本発明における、内燃
機関用スパークプラグの製造方法は、貴金属放電
部層とこの放電部層に接合した応力緩和層とを有
するチツプであつて貴金属製放電部層の端部寸法
と応力緩和層の端部寸法とが互いに異なる該チツ
プを設ける段階と、チツプの両端での寸法の相違
にもとずきチツプの応力緩和層側の端部を確定す
る段階と、該確定された応力緩和層側の端部を中
心電極の母材に接合する段階とを有することを特
徴とする。
In order to achieve the above object, the method of manufacturing a spark plug for an internal combustion engine according to the present invention includes a chip having a noble metal discharge layer and a stress relaxation layer bonded to the discharge layer, wherein the end portion of the noble metal discharge layer is providing the chip having different dimensions and end dimensions of the stress relaxation layer; determining the end of the chip on the stress relaxation layer side based on the difference in dimensions at both ends of the chip; and joining the end portion on the stress relaxation layer side to the base material of the center electrode.
また、チツプの応力緩和層側の端部に採色をほ
どこし貴金属放電部層との区別をおこなつてもよ
く、更に応力緩和層側の端部あるいは貴金属製放
電部層の端部の表面あらさを異なつたものとして
区別をおこなうこともできる。 Furthermore, the end of the chip on the stress relaxation layer side may be colored to distinguish it from the noble metal discharge layer, and the surface roughness of the end on the stress relaxation layer side or the end of the noble metal discharge layer may be colored. It is also possible to distinguish them as different things.
チツプの両端での寸法を変化させて確実な識別
をおこなう場合、複合チツプは円錐台形状が好ま
しく、貴金属製放電部層の端部直径をD7とし応
力緩和層側の端部直径をD8とすると｜D7−D8｜
0.05mmであれば即ちD7とD8との差が0.05mm以上
であれば応力緩和層側と放電部層とを確実に区別
できることを確認した。 If the dimensions at both ends of the chip are changed for reliable identification, the composite chip preferably has a truncated conical shape, with the end diameter of the noble metal discharge layer being D 7 and the end diameter of the stress relief layer side being D 8. Then |D 7 −D 8 |
It was confirmed that if it is 0.05 mm, that is, if the difference between D 7 and D 8 is 0.05 mm or more, the stress relaxation layer side and the discharge layer can be reliably distinguished.
以下本発明を実施例により詳細に説明する。 The present invention will be explained in detail below with reference to Examples.
例 １
第２図に示すように、スパークプラグの発火部
をなすチツプの形状を高さ0.05〜1.5mmの円錐台
形に成形し、チツプの貴金属製放電部端部７の直
径（D7）を0.45〜3.0mmとし応力緩和層端部８の
直径（D8）を0.5〜3.05mmとした。この場合D8−
D70.05mmであり応力緩和層端部と放電部端部と
を確実に区別できた。次にこの応力緩和層端部８
を抵抗溶接により中心電極１の先端に係合してス
パークプラグを製造した。
Example 1 As shown in Fig. 2, the shape of the tip forming the ignition part of the spark plug is formed into a truncated cone shape with a height of 0.05 to 1.5 mm, and the diameter (D 7 ) of the end 7 of the noble metal discharge part of the tip is The stress relaxation layer end portion 8 had a diameter (D 8 ) of 0.5 to 3.05 mm. In this case D 8 −
D 7 was 0.05 mm, and the end of the stress relaxation layer and the end of the discharge part could be reliably distinguished. Next, this stress relaxation layer end 8
was engaged with the tip of the center electrode 1 by resistance welding to manufacture a spark plug.
例 ２
第３図に示すように、チツプの形状を0.05〜
1.5mmの高さを有する円錐台形に成形し、放電部
端部７の直径（D7）を0.5〜3.05mmとし応力緩和
層端部８の直径（D8）を0.45〜3.00mmとし例１の
場合と逆に放電部端部の径を応力緩和層端部の径
よりも大きい形状とした。この場合D7−D8
0.05mmであり0.05mmよりも大きく応力緩和層を確
実に識別できた。次にこの複合チツプの応力緩和
層端部８を抵抗溶接により中心電極１の端部に接
合しスパークプラグを製造した。Example 2 As shown in Figure 3, the shape of the chip is 0.05 ~
Example 1: It is formed into a truncated cone shape with a height of 1.5 mm, and the diameter (D 7 ) of the discharge part end 7 is 0.5 to 3.05 mm, and the diameter (D 8 ) of the stress relaxation layer end 8 is 0.45 to 3.00 mm. Contrary to the case of , the diameter of the end of the discharge section was made larger than the diameter of the end of the stress relaxation layer. In this case D 7 − D 8
The stress relaxation layer was 0.05 mm, which was larger than 0.05 mm, and the stress relaxation layer could be reliably identified. Next, the stress relaxation layer end 8 of this composite chip was joined to the end of the center electrode 1 by resistance welding to produce a spark plug.
例 ３
第４図に示すようにスパークプラグの発火部を
なすチツプの形状を高さ0.05〜1.5mmで底部の直
径が0.5〜3.0mmの円錐形に成形し該円錐形の底部
側を応力緩和層とし、円錐形の頂点側を放電層と
して応力緩和層を確実に識別した。次にこの応力
緩和層である円錐の底部を抵抗溶接で中心電極１
の端部に接合しスパークプラグを製造した。Example 3 As shown in Figure 4, the tip that forms the firing part of a spark plug is shaped into a conical shape with a height of 0.05 to 1.5 mm and a bottom diameter of 0.5 to 3.0 mm, and the stress is relaxed on the bottom side of the conical shape. layer, and the stress relaxation layer was reliably identified by using the conical apex side as the discharge layer. Next, the bottom of the cone, which is the stress relaxation layer, is resistance welded to the center electrode 1.
A spark plug was manufactured by joining the end of the spark plug.
例 ４
スパークプラグの発火部をなすチツプを高さ
0.05〜1.5mm及び直径0.5〜3.0mmの円柱状に成形
し、放電部層側の端部表面に銅をメツキして端部
を採色した。次にこのチツプの応力緩和層側を採
色のあるなしで識別した後、この応力緩和層を中
心電極１の端部に接合しスパークプラグを製造し
た。銅メツキの厚さは60μｍ以下が好ましい。ま
た銅のかわりに銅合金、金あるいは金合金を使用
することができ、応力緩和層側端部に採色を施し
てもよく、メツキ処理のかわりに蒸着処理を使用
することもできる。Example 4 The height of the tip that forms the ignition part of a spark plug
It was formed into a cylindrical shape with a diameter of 0.05 to 1.5 mm and a diameter of 0.5 to 3.0 mm, and the end surface on the discharge layer side was plated with copper to color the end. Next, after identifying the stress relaxation layer side of this chip by coloring or not, this stress relaxation layer was bonded to the end of the center electrode 1 to manufacture a spark plug. The thickness of the copper plating is preferably 60 μm or less. Further, a copper alloy, gold, or a gold alloy can be used instead of copper, and the edge of the stress relaxation layer can be colored, and a vapor deposition treatment can be used instead of plating.
例 ５
スパークプラグの発火部をなすチツプを高さ
0.05〜1.5mm及び直径0.5〜3.0mmの円柱状に成形
し、応力緩和層側の端部をラツピング処理して鏡
面状とした。次にこのチツプの応力緩和層側を鏡
面状端部表面であるかどうかにより識別した後、
この応力緩和層を中心電極１の端部に接合しスパ
ークプラグを製造した。上記ラツピング処理によ
る鏡面状仕上のかわりにサンドブラスト等の方法
により応力緩和層端部をざらざらの粗面として応
力緩和層の識別をすることもでき、あるいは放電
部層側端部にこれらの処理のいずれかを施して識
別をすることもできる。表面あらさを表面の凹凸
部の平均高さで表示する場合に上記粗面の凹凸部
の平均高さは粗面化しない一方の端表面凹凸部の
平均高さの約２倍以上とすることが必要である。Example 5 The height of the tip that forms the ignition part of a spark plug
It was formed into a cylindrical shape with a diameter of 0.05 to 1.5 mm and a diameter of 0.5 to 3.0 mm, and the end on the stress relaxation layer side was wrapped to give a mirror finish. Next, after identifying the stress relaxation layer side of this chip by whether it has a mirror-like end surface or not,
This stress relaxation layer was bonded to the end of the center electrode 1 to produce a spark plug. Instead of the mirror-like finish created by the above-mentioned wrapping process, the end of the stress relieving layer can be made into a rough surface by a method such as sandblasting to identify the stress relieving layer, or the end of the discharge layer can be identified by any of these treatments. Identification can also be done by When surface roughness is expressed as the average height of the uneven portions on the surface, the average height of the uneven portions on the rough surface may be approximately twice or more than the average height of the uneven portions on the one end surface that is not roughened. is necessary.
上記例１〜５では発火物をなすチツプの応力緩
和層と放電部層との区別を確実におこないスパー
クプラグを製造したが、このチツプと向かい合つ
た接地電極３にチツプが使用されている場合も、
例１〜５に示した方法により応力緩和層を識別し
て応力緩和層を接地電極に抵抗溶接等の接合手段
により接合してスパークプラグを製造できる。 In Examples 1 to 5 above, spark plugs were manufactured by making sure to distinguish between the stress relaxation layer and the discharge layer of the chip that constitutes the ignition material, but when a chip is used for the ground electrode 3 facing this chip. too,
A spark plug can be manufactured by identifying the stress relaxation layer by the methods shown in Examples 1 to 5 and joining the stress relaxation layer to the ground electrode by a joining means such as resistance welding.
本発明においては、抵抗溶接等によるチツプ接
合の後に性能向上を目的として、中心電極チツプ
の放電部近傍を円柱状に機械加工してより細径と
してもよい。 In the present invention, after the chips are joined by resistance welding or the like, the vicinity of the discharge portion of the center electrode chip may be machined into a cylindrical shape to have a smaller diameter for the purpose of improving performance.
本発明の方法によればスパークプラグの発火部
であるチツプの応力緩和層が確実に識別でき、誤
つてチツプの放電部層が中心電極端部に接合され
ることがなくなつたため、信頼性のあるスパーク
プラグが製造可能となつた。
According to the method of the present invention, the stress relaxation layer of the tip, which is the ignition part of the spark plug, can be reliably identified, and the discharge part layer of the tip will not be erroneously joined to the end of the center electrode, thereby improving reliability. A certain spark plug has become possible to manufacture.
第１ａ図及び第１ｂ図はそれぞれ本発明の方法
によつて作られたスパークプラグの部分的に断面
とした正面図及びスパークプラグの主要部イの拡
大正面図であり、第２図は本発明の方法の一実施
例において使用した円錐台形状のチツプの断面図
であり、第３図は本発明の方法の別の実施例にお
いて使用した円錐台形状のチツプの断面図であ
り、第４図は本発明方法の更に別の実施例におい
て使用した円錐形状のチツプの断面図であり、第
５図及び第６図は、単一層から成るチツプを使用
した従来のスパークプラグに生じる亀裂及び酸化
部を示すスパークプラグ主要部の正面図であり、
第７図は貴金属製放電部層と応力緩和層とを有す
るチツプを設けたスパークプラグ主要部の正面図
であり、第８図は第７図のチツプの断面図であ
り、第９図は従来のスパークプラグの主要部を示
す正面図であり、第１０図は火花位置の突出した
スパークプラグの主要部を示す正面図である。
図中１は中心電極、２は貴金属製のチツプ、３
は接地電極、４はチツプと中心電極との接合界
面、５は放電部層、６は応力緩和層、５ａは亀
裂、５ｂは酸化物を示す。
1a and 1b are a partially sectional front view and an enlarged front view of the main part of the spark plug made by the method of the present invention, respectively, and FIG. FIG. 3 is a sectional view of a truncated conical tip used in an embodiment of the method of the present invention; FIG. 3 is a sectional view of a truncated conical tip used in another embodiment of the method of the present invention; FIG. 5 is a cross-sectional view of a conical tip used in yet another embodiment of the method of the present invention, and FIGS. 5 and 6 show cracks and oxidation that occur in a conventional spark plug using a single-layer tip. FIG. 3 is a front view of the main parts of the spark plug, showing the
FIG. 7 is a front view of the main part of a spark plug equipped with a chip having a noble metal discharge layer and a stress relaxation layer, FIG. 8 is a sectional view of the chip in FIG. 7, and FIG. 9 is a conventional spark plug. FIG. 10 is a front view showing the main part of the spark plug with a protruding spark position. In the figure, 1 is the center electrode, 2 is a noble metal chip, and 3
4 is a ground electrode, 4 is a bonding interface between the chip and the center electrode, 5 is a discharge layer, 6 is a stress relaxation layer, 5a is a crack, and 5b is an oxide.
Claims (1)
層に接合された応力緩和層を備え且つ該応力緩和
層を介して中心電極に接合されているチツプと、
該チツプと対向して隔置された接地電極とを有す
る内燃機関用スパークプラグの製造方法に於い
て、 該チツプの放電部層の端部寸法と、応力緩和層
の端部寸法とが互いに異なるチツプを設ける段階
と、 該チツプの両端での寸法の相違にもとずき該チ
ツプの応力緩和層側の端部を確定する段階と、 該確定された応力緩和層側の端部を介して該チ
ツプを中心電極に接合する段階とを有することを
特徴とする上記方法。 ２ チツプの形状は円錐台形である特許請求の範
囲第１項による内燃機関用スパークプラグの製造
方法。 ３ ｜（円錐台形の１つの底部の直径）−（円錐台
形の他の底部の直径）｜0.05mmである特許請求
の範囲第２項による内燃機関用スパークプラグの
製造方法。 ４ 応力緩和層側の円錐台形底部の直径が放電部
層側の円錐台形底部の直径よりも大きい、特許請
求の範囲第３項による内燃機関用スパークプラグ
の製造方法。 ５ 応力緩和層側の円錐台形底部の直径が放電部
層側の円錐台形底部の直径よりも小さい、特許請
求の範囲第３項による内燃機関用スパークプラグ
の製造方法。 ６ チツプの形状は円錐形であり、円錐底部側に
応力緩和層が設けられている、特許請求の範囲第
１項による内燃機関用スパークプラグの製造方
法。 ７ 中心電極と、貴金属製放電部層及び該放電部
層に接合された応力緩和層を備え且つ該応力緩和
層を介して中心電極に接合されているチツプと、
該チツプと対向して隔置された接地電極とを有す
る内燃機関用スパークプラグの製造方法に於い
て、 チツプの放電部層の端部と応力緩和層の端部と
のいずれか一方の表面に該表面の色と異なる色を
施したチツプを設ける段階と、 チツプの両端での色の相違にもとずきチツプの
応力緩和層側の端部を確定する段階と、 該確定された応力緩和層側の端部を介して該チ
ツプを中心電極に接合する段階とを有することを
特徴とする上記方法。 ８ チツプの放電部層の端部に蒸着あるいはメツ
キにより、銅、金、銅合金及び金合金から成る群
から選ばれた１種の薄膜を付与しそれにより応力
緩和層の端部と異なる色を放電部層の端部に施す
特許請求の範囲第７項による内燃機関用スパーク
プラグの製造方法。 ９ 蒸着によつて付与された薄膜の厚さは5μｍ
以下である特許請求の範囲第８項による内燃機関
用スパークプラグの製造方法。 １０ メツキにより付与された薄膜の厚さは60μ
ｍ以下である特許請求の範囲第８項による内燃機
関用スパークプラグの製造方法。 １１ 中心電極と、貴金属製放電部層及び該放電
部層に接合された応力緩和層を備え且つ該応力緩
和層を介して中心電極に接合されているチツプ
と、該チツプと対向して隔置された接地電極とを
有する内燃機関用スパークプラグの製造方法に於
いて、 チツプの放電部層端部と応力緩和層端部とのい
ずれか一方の表面に表面処理を施して互いに相違
する表面あらさの端部を備えたチツプを設ける段
階と、 チツプ両端での表面あらさの相違にもとずき応
力緩和層の端部を確定する段階と、 該確定された応力緩和層側の端部を介してチツ
プを中心電極に接合する段階とを有することを特
徴とする上記方法。 １２ チツプ両端での表面あらさの相違は、一方
の端部の表面凹凸部の平均高さと他方の端部の表
面凹凸部の平均高さとの差が２倍以上である特許
請求の範囲第１１項による方法。[Scope of Claims] 1. A chip comprising a center electrode, a noble metal discharge layer and a stress relaxation layer bonded to the discharge layer, and bonded to the center electrode via the stress relief layer;
In a method of manufacturing a spark plug for an internal combustion engine having a ground electrode spaced apart from the chip, an end dimension of the discharge layer of the chip and an end dimension of the stress relaxation layer are different from each other. a step of providing a chip; a step of determining an end of the chip on the stress relaxation layer side based on the difference in dimensions at both ends of the chip; bonding the chip to a center electrode. 2. A method for manufacturing a spark plug for an internal combustion engine according to claim 1, wherein the tip has a truncated conical shape. 3 | (diameter of one bottom of the truncated cone) - (diameter of the other bottom of the truncated cone) | 0.05 mm. The method for manufacturing a spark plug for an internal combustion engine according to claim 2. 4. The method for manufacturing a spark plug for an internal combustion engine according to claim 3, wherein the diameter of the truncated conical bottom on the stress relaxation layer side is larger than the diameter of the truncated conical bottom on the discharge layer side. 5. The method of manufacturing a spark plug for an internal combustion engine according to claim 3, wherein the diameter of the truncated conical bottom on the stress relaxation layer side is smaller than the diameter of the truncated conical bottom on the discharge layer side. 6. A method for manufacturing a spark plug for an internal combustion engine according to claim 1, wherein the tip has a conical shape and a stress relaxation layer is provided on the bottom side of the cone. 7. A chip comprising a center electrode, a noble metal discharge layer, and a stress relaxation layer bonded to the discharge layer, and bonded to the center electrode via the stress relief layer;
In the method for manufacturing a spark plug for an internal combustion engine, the spark plug has a ground electrode spaced apart from the chip, the chip having a surface of either an end of the discharge layer or an end of the stress relaxation layer of the chip. a step of providing a chip with a color different from the color of the surface; a step of determining an end of the chip on the stress relaxation layer side based on the difference in color at both ends of the chip; and a step of determining the end of the chip on the stress relaxation layer side; and bonding the chip to the center electrode via the layer side end. 8. A thin film of one kind selected from the group consisting of copper, gold, copper alloys, and gold alloys is applied by vapor deposition or plating to the ends of the discharge layer of the chip, thereby giving it a color different from that of the ends of the stress relaxation layer. A method for manufacturing a spark plug for an internal combustion engine according to claim 7, wherein the spark plug is applied to an end portion of a discharge layer. 9 The thickness of the thin film applied by vapor deposition is 5 μm
A method for manufacturing a spark plug for an internal combustion engine according to claim 8 as follows. 10 The thickness of the thin film applied by plating is 60μ
A method for manufacturing a spark plug for an internal combustion engine according to claim 8, wherein the spark plug is less than or equal to m. 11 A chip comprising a center electrode, a noble metal discharge layer and a stress relaxation layer bonded to the discharge layer and bonded to the center electrode via the stress relief layer, and a chip spaced apart opposite to the chip. In the method of manufacturing a spark plug for an internal combustion engine, the spark plug for an internal combustion engine has a ground electrode that has a ground electrode, and the surface of either one of the end of the discharge layer and the end of the stress relaxation layer of the chip is subjected to surface treatment so as to have different surface roughness. a step of providing a chip with an end portion of the chip; a step of determining the end portion of the stress relaxation layer based on the difference in surface roughness at both ends of the chip; and bonding the chip to the center electrode using a method. 12. The difference in surface roughness at both ends of the chip is that the difference between the average height of the surface unevenness at one end and the average height of the surface unevenness at the other end is at least twice as large. method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11656184A JPS60262374A (en) | 1984-06-08 | 1984-06-08 | Method of producing spark plug for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11656184A JPS60262374A (en) | 1984-06-08 | 1984-06-08 | Method of producing spark plug for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60262374A JPS60262374A (en) | 1985-12-25 |
| JPH0570274B2 true JPH0570274B2 (en) | 1993-10-04 |
Family
ID=14690155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11656184A Granted JPS60262374A (en) | 1984-06-08 | 1984-06-08 | Method of producing spark plug for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60262374A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3301094B2 (en) * | 1991-12-13 | 2002-07-15 | 株式会社デンソー | Spark plug for internal combustion engine and method of manufacturing the same |
| DE10011705A1 (en) * | 2000-03-10 | 2001-09-13 | Bosch Gmbh Robert | Sparking plug for IC engine, has center electrode and truncated cone shaped basic body with end facing toward combustion chamber, and includes fixed noble metal disc. |
| JP4028256B2 (en) | 2002-02-27 | 2007-12-26 | 日本特殊陶業株式会社 | Manufacturing method of spark plug |
| JP4964896B2 (en) | 2005-11-18 | 2012-07-04 | フェデラル−モーグル コーポレイション | Spark plug with multilayer ignition tip |
| JP4714249B2 (en) * | 2008-09-08 | 2011-06-29 | 日本特殊陶業株式会社 | Spark plug |
| CN103094842A (en) * | 2013-01-18 | 2013-05-08 | 株洲湘火炬火花塞有限责任公司 | Manufacture method for spark plug compound electrode tip and compound electrode tip band |
-
1984
- 1984-06-08 JP JP11656184A patent/JPS60262374A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60262374A (en) | 1985-12-25 |
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