JPH08171976A - Spark plug for internal combustion engine - Google Patents
Spark plug for internal combustion engineInfo
- Publication number
- JPH08171976A JPH08171976A JP33386394A JP33386394A JPH08171976A JP H08171976 A JPH08171976 A JP H08171976A JP 33386394 A JP33386394 A JP 33386394A JP 33386394 A JP33386394 A JP 33386394A JP H08171976 A JPH08171976 A JP H08171976A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- noble metal
- metal material
- spark
- fixed
- 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
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 20
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 51
- 239000007769 metal material Substances 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 42
- 238000003466 welding Methods 0.000 claims abstract description 20
- 239000010970 precious metal Substances 0.000 claims description 17
- 238000007599 discharging Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 25
- 239000000956 alloy Substances 0.000 description 25
- 239000002344 surface layer Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 229910000990 Ni alloy Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical compound [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，耐火花消耗性に優れた
貴金属材を電極の放電面に配置した内燃機関用スパーク
プラグに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark plug for an internal combustion engine in which a precious metal material having excellent spark wear resistance is arranged on the discharge surface of an electrode.
【０００２】[0002]
【従来技術】現在自動車等の内燃機関においては，長時
間の使用に耐えうるべく，中心電極と接地電極の少なく
とも一方の放電面に，貴金属材を配置して耐消耗性を向
上させたスパークプラグが採用されている。上記貴金属
材としては，耐火花消耗性に優れた白金，白金合金等が
用いられ，中心電極，接地電極等の電極母材としては，
ニッケル合金等が用いられている。また上記貴金属材の
固着には，抵抗溶接もしくはレーザービーム溶接，即ち
レーザービームを照射することにより貴金属材と電極母
材とを溶融，固着させる方法が適用されている。2. Description of the Related Art Currently, in an internal combustion engine of an automobile or the like, a spark plug having a noble metal material disposed on a discharge surface of at least one of a center electrode and a ground electrode so as to withstand long-term use and has improved wear resistance. Has been adopted. As the above-mentioned noble metal material, platinum, platinum alloy, etc., which are excellent in spark wear resistance, are used, and as the electrode base material for the center electrode, the ground electrode, etc.,
A nickel alloy or the like is used. For fixing the above-mentioned noble metal material, resistance welding or laser beam welding, that is, a method of melting and fixing the noble metal material and the electrode base material by irradiating a laser beam is applied.
【０００３】レーザービーム溶接による接合方法として
は，中心電極の先端近傍側面に環状の貴金属材を配置
し，その貴金属材にレーザービームを照射して貴金属材
全体と電極母材とを合金化する方法がある。また，特開
平６−１８８０６２号公報には，中心電極の先端面に貴
金属材を設置し，中心電極母材と貴金属材との界面にレ
ーザービームを照射して界面近傍の電極母材と貴金属材
とを溶融，合金化する方法により得られるスパークプラ
グが提案されている。As a joining method by laser beam welding, an annular noble metal material is arranged on the side surface near the tip of the center electrode, and the noble metal material is irradiated with a laser beam to alloy the entire noble metal material and the electrode base material. There is. Further, in Japanese Unexamined Patent Publication No. 6-188062, a noble metal material is installed on the tip surface of the center electrode, and a laser beam is irradiated to the interface between the center electrode base material and the noble metal material to irradiate the electrode base material and the noble metal material near the interface. A spark plug obtained by melting and alloying and has been proposed.
【０００４】[0004]
【解決しようとする課題】しかしながら，上記従来の内
燃機関用スパークプラグにおいては，次の問題がある。
即ち，レーザービーム溶接により貴金属材と電極母材と
が溶融した溶融合金部分は，抵抗溶接により得られる溶
融合金部分に比べ，広範囲に及ぶ。そのため，使用時の
冷熱サイクルの繰り返しにより発生する熱応力は，上記
溶融合金部分により緩和される。しかし，上記溶融合金
部分は，単一な貴金属材に比べて耐火花消耗性に劣り，
劣化が早いという欠点を有する。However, the above-mentioned conventional spark plug for an internal combustion engine has the following problems.
That is, the molten alloy portion obtained by melting the noble metal material and the electrode base material by laser beam welding has a wider area than the molten alloy portion obtained by resistance welding. Therefore, the thermal stress generated by the repeated thermal cycles during use is relaxed by the molten alloy portion. However, the molten alloy part is inferior in spark wear resistance to a single precious metal material,
It has the drawback of rapid deterioration.
【０００５】従って上記溶融合金部分は，貴金属材と電
極母材との接合品質には有利に働くが，耐火花消耗性に
対して不利となり長寿命化を妨げてしまう。この対策と
して，多量の貴金属材を使用することにより劣化を補う
ことが考えられるが，貴金属材は非常に高価であるため
不経済である。Therefore, the molten alloy portion has an advantageous effect on the joining quality between the noble metal material and the electrode base material, but is disadvantageous to the spark wear resistance and prevents the life from being extended. As a countermeasure against this, it is possible to compensate for the deterioration by using a large amount of precious metal material, but it is uneconomical because the precious metal material is very expensive.
【０００６】また，例えば上述した特開平６−１８８０
６２号公報に示されたスパークプラグのごとく，中心電
極の先端面に貴金属材を設置し，これらの界面をレーザ
ービーム溶接した場合においては，中心電極の側面に対
向するように接地電極を構成することができない。もし
このように構成すれば，電極母材と貴金属材との上記界
面においても火花放電が頻繁に行われ，界面に形成され
た溶融合金部分が選択的に消耗し，劣化を早めるだけで
なく，貴金属材の脱落をも招くおそれがある。したがっ
て，従来のレーザービーム溶接により得られたスパーク
プラグにおいては，中心電極と接地電極の構成の自由度
に制約が生じてしまう。Further, for example, the above-mentioned Japanese Patent Laid-Open No. 6-1880
As in the spark plug disclosed in Japanese Patent Laid-Open No. 62-62, when a noble metal material is installed on the tip end surface of the center electrode and these interfaces are laser-beam welded, the ground electrode is formed so as to face the side surface of the center electrode. I can't. If configured in this way, spark discharge is frequently performed even at the above-mentioned interface between the electrode base material and the noble metal material, and the molten alloy portion formed at the interface is selectively consumed, which not only accelerates deterioration but also It may also cause the precious metal material to fall off. Therefore, in the spark plug obtained by conventional laser beam welding, there is a restriction on the degree of freedom in the configuration of the center electrode and the ground electrode.
【０００７】本発明は，かかる従来の問題点に鑑みてな
されたもので，中心電極と接地電極の構成の自由度を制
約することなく，レーザービーム溶接により貴金属材を
電極母材に固着することができ，耐火花消耗性に優れ
た，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。The present invention has been made in view of the above-mentioned conventional problems, and it is possible to fix a noble metal material to an electrode base material by laser beam welding without restricting the degree of freedom of the configuration of the center electrode and the ground electrode. It is intended to provide a spark plug for an internal combustion engine which is capable of achieving excellent spark wear resistance.
【０００８】[0008]
【課題の解決手段】本発明は，中心電極と接地電極とが
対峙して火花ギャップを形成し，上記中心電極と上記接
地電極の放電部分の少なくとも一方に貴金属材をレーザ
ービーム溶接により固着してなる内燃機関用スパークプ
ラグにおいて，上記貴金属材は，電極母材に対して固着
する固定部と，該固定部よりも突出し火花放電させるた
めの突出部とを有することを特徴とする内燃機関用スパ
ークプラグにある。According to the present invention, a center electrode and a ground electrode face each other to form a spark gap, and a precious metal material is fixed to at least one of the discharge parts of the center electrode and the ground electrode by laser beam welding. In the spark plug for an internal combustion engine, the noble metal material has a fixing portion that is fixed to the electrode base material, and a protruding portion that protrudes from the fixing portion and causes a spark discharge. On the plug.
【０００９】本発明において最も注目すべきことは，上
記貴金属材は，上記固定部と，該固定部よりも突出した
上記突出部とを有することにある。そして，上記貴金属
材は，上記電極母材に対して上記固定部をレーザービー
ム溶接することにより固着してあることにある。なお，
上記貴金属材としては，従来と同様に，白金（Ｐｔ），
白金−イリジウム（Ｉｒ）合金等がある。また，上記中
心電極及び接地電極の電極母材としては，ニッケル合金
等がある。What is most noticeable in the present invention is that the noble metal material has the fixing portion and the protruding portion protruding from the fixing portion. The noble metal material is fixed to the electrode base material by laser beam welding the fixing portion. In addition,
As the noble metal material, platinum (Pt),
There is a platinum-iridium (Ir) alloy and the like. Further, nickel alloy or the like is used as the electrode base material of the center electrode and the ground electrode.
【００１０】また，上記貴金属材における上記突出部の
表面は，上記固定部の表面よりも０．３ｍｍ以上突出し
ていることが好ましい。これにより，火花放電はほぼ確
実に上記突出部の表面のみから行われ，上記固定部から
の放電の可能性をさらに低減することができる。Further, it is preferable that the surface of the protruding portion of the noble metal material protrudes by 0.3 mm or more from the surface of the fixed portion. As a result, the spark discharge is almost certainly generated only from the surface of the protruding portion, and the possibility of the discharge from the fixed portion can be further reduced.
【００１１】[0011]
【作用および効果】本発明の内燃機関用スパークプラグ
においては，上記貴金属材は，上記固定部と，該固定部
よりも突出した上記突出部を有する。そのため，電極間
の間隔は，上記貴金属材の突出部において最も短くな
る。それ故，火花放電は上記貴金属材の突出部において
選択的に行われ，固定部における火花放電の発生を防止
することができる。In the spark plug for an internal combustion engine according to the present invention, the noble metal material has the fixing portion and the protruding portion protruding from the fixing portion. Therefore, the interval between the electrodes is the shortest in the protruding portion of the precious metal material. Therefore, the spark discharge is selectively generated at the protruding portion of the precious metal material, and the spark discharge at the fixed portion can be prevented from occurring.
【００１２】また，レーザービーム溶接は，上記固定部
のみにおいて行われ，上記突出部においては行われてい
ない。そのため，上記突出部は，溶融合金部分を有して
おらず貴金属材の成分のままである。それ故，火花放電
が行われる上記突出部においては，本来の耐火花消耗性
が発揮され，寿命の短縮化を防止することができる。Further, the laser beam welding is performed only on the fixed portion and not on the protruding portion. Therefore, the protruding portion has no molten alloy portion and remains the component of the noble metal material. Therefore, in the above-mentioned protruding portion where the spark discharge is performed, the original spark consumption resistance is exhibited, and the shortening of the life can be prevented.
【００１３】さらに，レーザービームは，貴金属材と電
極母材との界面部ではなく，貴金属材の表面から照射さ
れている。そのため，レーザービーム溶接により発生す
る溶融合金部分の表層部はほぼ貴金属材単一の成分によ
り占められ，一方深層部は電極母材成分に富む十分な合
金状態となっている。それ故，溶融合金部分の表面から
の酸化腐食は，上記表層部により防止することができ
る。また，使用時の熱冷サイクルの繰り返しにより発生
する熱応力は，上記深層部の合金成分により緩和するこ
とができる。Further, the laser beam is emitted from the surface of the precious metal material, not the interface between the precious metal material and the electrode base material. Therefore, the surface layer part of the molten alloy portion generated by laser beam welding is almost occupied by the single component of the noble metal, while the deep layer part is in a sufficient alloy state rich in the electrode base metal component. Therefore, oxidative corrosion from the surface of the molten alloy portion can be prevented by the surface layer portion. Further, the thermal stress generated by the repeated thermal cooling cycle during use can be relaxed by the alloy component in the deep layer.
【００１４】従って，本発明によれば，中心電極と接地
電極の構成の自由度を制約することなく，レーザービー
ム溶接により貴金属材を電極母材に固着することがで
き，耐火花消耗性に優れた，内燃機関用スパークプラグ
を提供することができる。Therefore, according to the present invention, the noble metal material can be fixed to the electrode base material by laser beam welding without restricting the degree of freedom in the configuration of the center electrode and the ground electrode, and the spark wear resistance is excellent. Moreover, a spark plug for an internal combustion engine can be provided.
【００１５】[0015]
実施例１ 本発明の実施例にかかる内燃機関用スパークプラグにつ
き，図１〜図３を用いて説明する。本例の内燃機関用ス
パークプラグ８０は，図１，図３に示すごとく，中心電
極１と２本の接地電極４とが対峙して火花ギャップを形
成し，上記中心電極１と上記接地電極４の放電部分に貴
金属材２，５をレーザービーム溶接により固着してな
る。Example 1 A spark plug for an internal combustion engine according to an example of the present invention will be described with reference to FIGS. 1 to 3. In the spark plug 80 for an internal combustion engine of this example, as shown in FIGS. 1 and 3, the center electrode 1 and the two ground electrodes 4 face each other to form a spark gap, and the center electrode 1 and the ground electrode 4 are formed. Noble metal materials 2 and 5 are fixed to the discharge part of the laser beam by laser beam welding.
【００１６】また，上記貴金属材２，５は，図１，図３
に示すごとく，電極母材に対して固着する固定部２２，
５２と，該固定部２２，５２よりも突出し火花放電させ
るための突出部２１，５１とを有する。The precious metal materials 2 and 5 are the same as those shown in FIGS.
As shown in, the fixing portion 22, which is fixed to the electrode base material,
52, and projecting portions 21 and 51 that project from the fixing portions 22 and 52 to cause a spark discharge.
【００１７】また，上記中心電極１の電極母材は，図１
に示すごとく，ニッケル合金よりなる表皮部１２の中に
銅からなる芯材１３を埋設してなり，直径１．５ｍｍφ
の細い円柱状の先端部１１を有する。そして，図１，図
３に示すごとく，上記中心電極１の先端部１１には，リ
ング状の上記貴金属材２が装着されている。The electrode base material of the center electrode 1 is as shown in FIG.
As shown in Fig. 2, a core material 13 made of copper is embedded in a skin 12 made of nickel alloy, and the diameter is 1.5 mmφ.
Has a thin cylindrical tip portion 11. Then, as shown in FIGS. 1 and 3, the ring-shaped noble metal material 2 is attached to the tip portion 11 of the center electrode 1.
【００１８】この中心電極１に装着された貴金属材２
は，Ｐｔ−２０Ｉｒ（ｗｔ％）合金よりなり，内径が
１．５ｍｍφ，突出部２１の外径が２．５ｍｍφ，固定
部２２の外径が１．９ｍｍφである。即ち，突出部２１
の表面は，固定部２２の表面より０．３ｍｍ突出（図２
の長さＬ）している。また，突出部２１表面の長さは
１．０ｍｍ，固定部２２の長さは０．５ｍｍである。Noble metal material 2 attached to the center electrode 1.
Is made of a Pt-20Ir (wt%) alloy and has an inner diameter of 1.5 mmφ, an outer diameter of the protruding portion 21 is 2.5 mmφ, and an outer diameter of the fixed portion 22 is 1.9 mmφ. That is, the protrusion 21
Surface of the fixed part 22 protrudes by 0.3 mm (see FIG. 2).
The length is L). The length of the surface of the protruding portion 21 is 1.0 mm, and the length of the fixed portion 22 is 0.5 mm.
【００１９】そして，上記固定部２２は，図１〜図３に
示すごとく，複数か所あるいは全周においてレーザービ
ームが照射され，溶融合金部分３が形成されている。上
記溶融合金部分３は，図２に示すごとく，その断面形状
がくさび形をなし，ほぼ貴金属材単一の成分からなる表
層部３１と，電極母材の成分に富む十分な合金状態の深
層部３２とよりなる。As shown in FIGS. 1 to 3, the fixed portion 22 is irradiated with a laser beam at a plurality of locations or the entire circumference thereof to form the molten alloy portion 3. As shown in FIG. 2, the molten alloy portion 3 has a wedge-shaped cross-section, and a surface layer portion 31 substantially composed of a single component of a precious metal material and a deep layer portion in a sufficient alloy state rich in a component of an electrode base material. And 32.
【００２０】また，上記接地電極４に固着された貴金属
材５は，図１，図３に示すごとく，固定部５２と突出部
５１とよりなる円弧状をしており，そのサイズの構成
は，中心電極１と同様である。即ち，突出部５１の厚み
は０．５ｍｍ，固定部５２の厚みは０．２ｍｍであり，
突出部５１の表面は固定部５２の表面より０．３ｍｍ突
出している。また，接地電極４のレーザービーム溶接に
よる溶融合金部分６は，中心電極１における溶融合金部
分３と同様に，その断面形状がくさび形をなし，上記と
同様の成分構成の表層部と深層部とよりなる。Further, as shown in FIGS. 1 and 3, the noble metal material 5 fixed to the ground electrode 4 has an arc shape composed of a fixing portion 52 and a protruding portion 51, and its size is composed of It is similar to the center electrode 1. That is, the thickness of the protruding portion 51 is 0.5 mm, the thickness of the fixed portion 52 is 0.2 mm,
The surface of the projecting portion 51 projects by 0.3 mm from the surface of the fixing portion 52. Further, the molten alloy portion 6 of the ground electrode 4 by laser beam welding has a wedge-shaped cross-section similar to the molten alloy portion 3 of the center electrode 1, and has a surface layer portion and a deep layer portion having the same composition as the above. Consists of.
【００２１】次に，本例における作用効果につき説明す
る。本例の内燃機関用スパークプラグ８０においては，
中心電極１と接地電極４にそれぞれ固着させた貴金属材
２，３は，上記固定部２２，５２と，該固定部２２，５
２よりも突出した上記突出部２１，５１を有する。その
ため，中心電極１と接地電極４との間隔は，それぞれの
貴金属材２，５の突出部２１，５２間において最も短く
なる。それ故，火花放電は，貴金属材２，５の突出部２
１，５１同志の間において選択的に行われ，固定部２
２，５２における火花放電を防止することができる。Next, the function and effect of this example will be described. In the spark plug 80 for an internal combustion engine of this example,
The noble metal materials 2 and 3 fixed to the center electrode 1 and the ground electrode 4 respectively include the fixing portions 22 and 52 and the fixing portions 22 and 5.
It has the said protrusion parts 21 and 51 which protruded rather than 2. Therefore, the distance between the center electrode 1 and the ground electrode 4 is the shortest between the protrusions 21 and 52 of the noble metal materials 2 and 5, respectively. Therefore, the spark discharge is caused by the protrusion 2 of the precious metal material 2, 5.
The fixed part 2 is performed selectively between 1,51 comrades.
Spark discharge at 2, 52 can be prevented.
【００２２】また，レーザービーム溶接は，それぞれの
貴金属材２，５の固定部２２，５２のみにおいてのみ行
われ，突出部２１，５１においては行われていない。そ
のため，上記突出部２１，５１は，溶融合金部分を有し
ておらず貴金属材２，５の成分のままである。それ故，
火花放電が行われる上記突出部２１，５１においては，
本来の耐火花消耗性が発揮され，寿命の短縮化を防止す
ることができる。Further, the laser beam welding is performed only on the fixing portions 22 and 52 of the respective noble metal materials 2 and 5, but not on the protruding portions 21 and 51. Therefore, the protrusions 21 and 51 do not have a molten alloy portion and remain the components of the noble metal materials 2 and 5. Therefore,
In the above-mentioned protruding parts 21 and 51 where spark discharge is performed,
The original spark wear resistance is exhibited, and it is possible to prevent shortening of the life.
【００２３】さらに，レーザービームは，貴金属材２と
電極母材との界面部ではなく，貴金属材２，５の固定部
２２，５２の表面から照射されている。そのため，上述
したごとく，レーザービーム溶接により発生する溶融合
金部分３，６の表層部３１，６１はほぼ貴金属材２，５
単一の成分により占められ，深層部３２，６２は電極母
材の成分に富む十分な合金状態が形成されている。Further, the laser beam is emitted from the surface of the fixed portions 22 and 52 of the noble metal materials 2 and 5 rather than the interface between the noble metal material 2 and the electrode base material. Therefore, as described above, the surface layer portions 31 and 61 of the molten alloy portions 3 and 6 generated by laser beam welding are almost noble metal materials 2 and 5.
The deep layers 32 and 62 are occupied by a single component, and a sufficient alloy state rich in the component of the electrode base material is formed.
【００２４】それ故，溶融合金部分３，６の表面からの
酸化腐食は，上記表層部３１，６１により，防止するこ
とができる。また，使用時の熱冷サイクルの繰り返しに
より発生する熱応力は，上記深層部３２，６２の合金成
分により緩和することができる。Therefore, the oxidative corrosion from the surface of the molten alloy portions 3 and 6 can be prevented by the surface layer portions 31 and 61. Further, the thermal stress generated by the repeated thermal cooling cycle during use can be relaxed by the alloy components of the deep layer portions 32 and 62.
【００２５】従って，本例によれば，中心電極１の側面
側に接地電極４を対向させる構成をとっても，レーザー
ビーム溶接により貴金属材２，６を電極母材に固着する
ことができ，耐火花消耗性に優れた，内燃機関用スパー
クプラグを得ることができる。Therefore, according to this embodiment, even if the ground electrode 4 is opposed to the side surface of the center electrode 1, the precious metal materials 2 and 6 can be fixed to the electrode base material by laser beam welding, and the spark resistance It is possible to obtain a spark plug for an internal combustion engine that has excellent wear resistance.
【００２６】実施例２ 本例の内燃機関用スパークプラグ８２は，図４に示すご
とく，実施例１の中心電極１用の貴金属材２５に代え
て，２か所の突出部２２１とその間に設けた固定部２２
２とを有するリング状の貴金属材２５を用いた。また実
施例１の接地電極４用の貴金属材５に代えて，２か所の
突出部５５１とその間に設けた固定部５５２とを有する
円弧状の貴金属材５５とを用いた。その他は，実施例１
と同様である。尚，実施例１と略同一の構成部分につい
ては，実施例１と同じ符号を用いた。Embodiment 2 As shown in FIG. 4, the spark plug 82 for an internal combustion engine of this embodiment is provided with two protruding portions 221 and between them in place of the noble metal material 25 for the center electrode 1 of Embodiment 1. Fixed part 22
A ring-shaped noble metal material 25 having a diameter of 2 was used. Further, in place of the noble metal material 5 for the ground electrode 4 of Example 1, an arc-shaped noble metal material 55 having two projecting portions 551 and a fixing portion 552 provided therebetween is used. Others are Example 1
Is the same as The same reference numerals as those of the first embodiment are used for the same components as those of the first embodiment.
【００２７】本例によれば，貴金属材２５，５５ともに
２か所の突出部２２１，５５１を有する。そのため，火
花放電をさらに安定して突出部２２１，５５１に集中さ
せることができる。その他，実施例１と同様の効果を得
ることができる。According to this example, both the noble metal materials 25 and 55 have the protruding portions 221 and 551 at two places. Therefore, the spark discharge can be more stably concentrated on the protrusions 221 and 551. In addition, the same effect as that of the first embodiment can be obtained.
【００２８】実施例３ 本例の内燃機関用スパークプラグ８３は，図５に示すご
とく，中心電極１の貴金属材２に代えて，円盤状の突出
部２７１とその下方に延設した円筒状の固定部２７２を
有し，貫通穴を有さない貴金属材２７を用いた。接地電
極４及びその他は，実施例１と同様である。尚，実施例
１と略同一の構成部分については，実施例１と同じ符号
を用いた。Embodiment 3 As shown in FIG. 5, a spark plug 83 for an internal combustion engine according to this embodiment has a disk-shaped projecting portion 271 and a cylindrical shape extending below it instead of the precious metal material 2 of the center electrode 1. The noble metal material 27 having the fixing portion 272 and having no through hole was used. The ground electrode 4 and others are the same as in the first embodiment. The same reference numerals as those of the first embodiment are used for the same components as those of the first embodiment.
【００２９】本例においても，実施例１と同様の効果を
得ることができる。尚，本例においては，中心電極１の
側面側に２本の接地電極４を対向させたが，中心電極１
の先端面２７５側に１本の接地電極を対向させることも
できる。Also in this example, the same effect as that of the first embodiment can be obtained. In addition, in this example, the two ground electrodes 4 are opposed to the side surface of the center electrode 1.
It is also possible to make one ground electrode face the front end surface 275 side.
【００３０】実施例４ 本例の内燃機関用スパークプラグ８４は，図６に示すご
とく，中心電極１の先端面側に１本の接地電極４０を対
向させた構成をとっている。そして，中心電極１の先端
には，カップ状の貴金属材２９を固着してある。また，
接地電極４においても，中心電極１に対向する側にカッ
プ状の貴金属材５９を固着してある。Embodiment 4 As shown in FIG. 6, the spark plug 84 for an internal combustion engine of this embodiment has a structure in which one ground electrode 40 is opposed to the tip end surface side of the center electrode 1. A cup-shaped noble metal material 29 is fixed to the tip of the center electrode 1. Also,
Also in the ground electrode 4, a cup-shaped noble metal material 59 is fixed to the side facing the center electrode 1.
【００３１】上記カップ状の貴金属材２９，５９は，そ
の底部に当たる固定部２９２，５９２と，その表面から
突出した円筒状の突出部２９１，５９１とよりなる。そ
して，上記固定部２９２，５９２にレーザービームを照
射することにより，貴金属材２９，５９をそれぞれの電
極母材に溶接してある。その他は，実施例１と同様であ
る。尚，実施例１と略同一の構成部分については，実施
例１と同じ符号を用いた。本例においても，実施例１と
同様の効果を得ることができる。The cup-shaped noble metal members 29 and 59 are composed of fixing portions 292 and 592 which are the bottom portions thereof, and cylindrical protrusion portions 291 and 591 which protrude from the surface thereof. The noble metal materials 29 and 59 are welded to the respective electrode base materials by irradiating the fixing portions 292 and 592 with a laser beam. Others are the same as in the first embodiment. The same reference numerals as those of the first embodiment are used for the same components as those of the first embodiment. Also in this example, the same effect as that of the first embodiment can be obtained.
【図１】実施例１のスパークプラグおける，電極部分の
断面図。FIG. 1 is a sectional view of an electrode portion of a spark plug according to a first embodiment.
【図２】実施例１における，貴金属材と電極母材との溶
接状態の説明図。FIG. 2 is an explanatory view of a welded state of a noble metal material and an electrode base material in Example 1.
【図３】実施例１のスパークプラグにおける，電極部分
の斜視図。FIG. 3 is a perspective view of an electrode portion in the spark plug of the first embodiment.
【図４】実施例２のスパークプラグおける，電極部分の
断面図。FIG. 4 is a sectional view of an electrode portion in the spark plug of the second embodiment.
【図５】実施例３のスパークプラグおける，電極部分の
断面図。FIG. 5 is a sectional view of an electrode portion in a spark plug of Example 3.
【図６】実施例４のスパークプラグおける，電極部分の
断面図。FIG. 6 is a sectional view of an electrode portion in the spark plug of Example 4.
１．．．中心電極， １１．．．先端部， ２，５．．．貴金属材， ２１，５１．．．突出部， ２２，５２．．．固定部， ３，６．．．溶融合金部分， ３１，６１．．．表層部， ３２，６２．．．深層部， ４．．．接地電極， 1. . . Center electrode, 11. . . Tip, 2,5. . . Precious metal material, 21, 51. . . Protrusions, 22, 52. . . Fixed part, 3,6. . . Molten alloy portion, 31, 61. . . Surface layer, 32, 62. . . Deep part, 4. . . Ground electrode,
Claims (2)
ャップを形成し，上記中心電極と上記接地電極の放電部
分の少なくとも一方に貴金属材をレーザービーム溶接に
より固着してなる内燃機関用スパークプラグにおいて，
上記貴金属材は，電極母材に対して固着する固定部と，
該固定部よりも突出し火花放電させるための突出部とを
有することを特徴とする内燃機関用スパークプラグ。1. A spark for an internal combustion engine in which a center electrode and a ground electrode face each other to form a spark gap, and a noble metal material is fixed by laser beam welding to at least one of discharge portions of the center electrode and the ground electrode. In the plug,
The above-mentioned precious metal material has a fixing portion fixed to the electrode base material,
A spark plug for an internal combustion engine, comprising: a protrusion that protrudes from the fixed portion and causes a spark discharge.
る上記突出部の表面は，上記固定部の表面よりも０．３
ｍｍ以上突出していることを特徴とする内燃機関用スパ
ークプラグ。2. The surface of the protruding portion of the noble metal material according to claim 1, is 0.3 or more than the surface of the fixing portion.
A spark plug for an internal combustion engine, which is characterized by protruding by more than mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33386394A JP3692555B2 (en) | 1994-12-16 | 1994-12-16 | Spark plug for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33386394A JP3692555B2 (en) | 1994-12-16 | 1994-12-16 | Spark plug for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08171976A true JPH08171976A (en) | 1996-07-02 |
| JP3692555B2 JP3692555B2 (en) | 2005-09-07 |
Family
ID=18270793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33386394A Expired - Fee Related JP3692555B2 (en) | 1994-12-16 | 1994-12-16 | Spark plug for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3692555B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0859436A1 (en) * | 1997-02-12 | 1998-08-19 | Beru AG | Spark plug for internal combustion engine and method of making it |
| DE19854861A1 (en) * | 1998-11-27 | 2000-05-31 | Beru Ag | spark plug |
| DE102004021876B3 (en) * | 2004-05-04 | 2006-01-19 | Beru Ag | spark plug |
| CN101507067A (en) * | 2006-06-19 | 2009-08-12 | 费德罗-莫格尔公司 | Spark plug with fine wire ground electrode |
| EP1929598A4 (en) * | 2005-09-29 | 2011-12-07 | Federal Mogul Corp | Spark plug with welded sleeve on electrode |
| CN103828150A (en) * | 2011-06-28 | 2014-05-28 | 美国辉门（菲德尔莫古）点火系统有限公司 | Spark plug electrode configuration |
| WO2014199540A1 (en) | 2013-06-11 | 2014-12-18 | 日本特殊陶業株式会社 | Spark plug |
-
1994
- 1994-12-16 JP JP33386394A patent/JP3692555B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0859436A1 (en) * | 1997-02-12 | 1998-08-19 | Beru AG | Spark plug for internal combustion engine and method of making it |
| US6064144A (en) * | 1997-02-12 | 2000-05-16 | Beru Ag | Spark plug for an internal combustion engine and process for its manufacture |
| DE19854861A1 (en) * | 1998-11-27 | 2000-05-31 | Beru Ag | spark plug |
| DE102004021876B3 (en) * | 2004-05-04 | 2006-01-19 | Beru Ag | spark plug |
| EP1929598A4 (en) * | 2005-09-29 | 2011-12-07 | Federal Mogul Corp | Spark plug with welded sleeve on electrode |
| CN101507067A (en) * | 2006-06-19 | 2009-08-12 | 费德罗-莫格尔公司 | Spark plug with fine wire ground electrode |
| CN103828150A (en) * | 2011-06-28 | 2014-05-28 | 美国辉门（菲德尔莫古）点火系统有限公司 | Spark plug electrode configuration |
| WO2014199540A1 (en) | 2013-06-11 | 2014-12-18 | 日本特殊陶業株式会社 | Spark plug |
| US9525270B2 (en) | 2013-06-11 | 2016-12-20 | Ngk Spark Plug Co., Ltd. | Spark plug |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3692555B2 (en) | 2005-09-07 |
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