JP2923672B2 - Spark plug ground electrode - Google Patents
Spark plug ground electrodeInfo
- Publication number
- JP2923672B2 JP2923672B2 JP14982690A JP14982690A JP2923672B2 JP 2923672 B2 JP2923672 B2 JP 2923672B2 JP 14982690 A JP14982690 A JP 14982690A JP 14982690 A JP14982690 A JP 14982690A JP 2923672 B2 JP2923672 B2 JP 2923672B2
- Authority
- JP
- Japan
- Prior art keywords
- ground electrode
- copper
- spark plug
- layer
- nickel
- 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.)
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- Spark Plugs (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) この発明は、内熱機関に使用されるスパークプラグの
接地電極に関する。Description: TECHNICAL FIELD The present invention relates to a ground electrode of a spark plug used for an internal heat engine.
(従来の技術) 従来、内燃機関に使用されるスパークプラグの接地電
極においては、ニッケル合金単層からなるものが、一般
的に使用されているが、近年の内燃機関の高性能化に伴
って、燃焼室内に常時突出している接地電極によつて発
生する、圧縮工程におけるプレイグニッションを防止す
るために、良熱伝導材料で構成されることが必要とされ
てきており、そのためニッケル合金よりなる単層の接地
電極に対して、内部に銅を封入してなる複層構造のニッ
ケル合金のクラッド材からなるものを接地電極に利用す
るもの(特開昭58−140985号)や芯材に純ニッケルを使
用し、その外層部にクロムを10%以上含有するニッケル
合金を設けてなるもの(特開昭60−41785号)が提案さ
れている。(Prior Art) Conventionally, as a ground electrode of a spark plug used in an internal combustion engine, a single electrode made of a nickel alloy is generally used, but with the recent high performance of the internal combustion engine, In order to prevent the pre-ignition in the compression process, which is caused by the ground electrode constantly projecting into the combustion chamber, it is required to be made of a good heat conductive material. For the grounding electrode of the layer, the one made of a clad material of a nickel alloy having a multilayer structure in which copper is enclosed inside is used for the grounding electrode (Japanese Patent Application Laid-Open No. 58-140985), and the core material is made of pure nickel. (Japanese Patent Application Laid-Open No. Sho 60-41785) has been proposed in which an outer layer is provided with a nickel alloy containing 10% or more of chromium.
(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、特開昭58−
140985号の場合、接地電極を内部に銅を封入してなる複
層構造のニッケル合金のクラッド材からなるものとする
が、塑性加工の工程で1本ずつ成形加工を要するので量
産性が劣ること、あるいは、銅の封入位置や形状が塑性
加工のレイアウトの関係上、制約を受け、熱ひきに最も
有利の長手方向に全体に均一に封入されがたい。(Problems to be Solved by the Invention) However, in the above-mentioned conventional one,
In the case of No. 140985, the ground electrode is made of a clad material of nickel alloy with a multilayer structure in which copper is enclosed inside, but the mass production is inferior since each forming process is required in the plastic working process Alternatively, the position and shape of copper to be filled are restricted due to the layout of the plastic working, and it is difficult to uniformly fill the entire length in the longitudinal direction which is most advantageous for heat sinking.
また、局部的に封入体積の大きいところでは銅とニッ
ケルの熱膨張差によりニッケル部に亀裂を生じる問題が
ある。更には、塑性加工で成形するので、ニッケル合金
としてはインコネル600あるいは601等の耐食性ニッケル
合金は使用しがたい等の問題がある。Further, there is a problem that a crack is generated in a nickel portion due to a difference in thermal expansion between copper and nickel in a portion where a sealed volume is locally large. Furthermore, since it is formed by plastic working, there is a problem that it is difficult to use a corrosion-resistant nickel alloy such as Inconel 600 or 601 as a nickel alloy.
更に、特開昭60−41785号の場合、芯材を純ニッケル
よりなるものとして、その外表を覆う外層部にクロムを
10%以上含有するニッケル合金を設けてなるものとする
ことによって、芯材と外層部との間の線膨張係数の差を
最小限のものとし、接地電極が高温となっても熱応力の
発生を最小限にし、接地電極の破損等を防止しようとす
るものであるが、芯材として使用される純ニッケルは熱
伝導率が低いので、接地電極自体の良熱伝導性が十分に
確保されることがなく、接地電極に起因するプレイグニ
ッションを誘発し、内燃機関を損傷し易いものである。Further, in the case of JP-A-60-41785, the core material is made of pure nickel, and chromium is applied to the outer layer covering the outer surface.
By providing a nickel alloy containing 10% or more, the difference in the coefficient of linear expansion between the core material and the outer layer is minimized, and thermal stress is generated even if the ground electrode becomes hot. The purpose is to minimize breakage of the ground electrode, etc., but since pure nickel used as the core material has a low thermal conductivity, good thermal conductivity of the ground electrode itself is sufficiently ensured. In this case, preignition caused by the ground electrode is induced, and the internal combustion engine is easily damaged.
そこで、この発明は上記従来のものの持つ欠点を改善
するものであり、スパークプラグの接地電極を複数層を
有するクラッド材からなるものとし良熱伝導性を確保
し、更に上記クラッド材を容易に得ることができるよう
にするものである。In view of the above, the present invention has been made to improve the above-mentioned disadvantages of the related art, and the ground electrode of a spark plug is made of a clad material having a plurality of layers to ensure good thermal conductivity, and the clad material is easily obtained. Is what you can do.
(課題を解決するための手段) そのために、接地電極を、銅もしくは銅合金よりなる
略棒状芯部が、純ニッケルもしくはニッケル合金よりな
る第一層部に被覆され、前記第一層部がすくなくとも1
種以上の層からなるニッケル合金の第二層部により被覆
されていると共に、前記第一層部は第二層部より良熱伝
導材料からなり、かつ、第二層部は第一層部より耐食性
の良好な材料から形成されてなるものとする。また略筒
状の主体金具と、該主体金具に嵌め込まれる軸孔付き絶
縁体と、該絶縁体の軸孔に固定される中心電極と、前記
主体金具の先端面に溶接され、前記中心電極との間で放
電間隙を形成する接地電極を有するスパークプラグであ
って、前記接地電極の外表面は、銅もしくは銅合金より
なる略棒状芯部を被覆した第一層部の純ニッケルもしく
はニッケル合金よりなる第一層部よりも耐食性の良好な
第二層部のニッケル合金により形成してなるものであ
る。(Means for Solving the Problems) To this end, a substantially rod-shaped core made of copper or a copper alloy is coated with a first layer made of pure nickel or a nickel alloy, and the first layer is made at least. 1
The first layer portion is made of a better heat conductive material than the second layer portion, and the second layer portion is made of the first layer portion. It shall be formed from a material having good corrosion resistance. Further, a substantially cylindrical metal shell, an insulator with a shaft hole fitted into the metal shell, a center electrode fixed to a shaft hole of the insulator, and a center electrode welded to a tip end surface of the metal shell, A spark plug having a ground electrode that forms a discharge gap between the outer electrode and the outer surface of the ground electrode is made of pure nickel or a nickel alloy of a first layer covering a substantially rod-shaped core made of copper or a copper alloy. The second layer portion is formed of a nickel alloy having better corrosion resistance than the first layer portion.
更に前記略棒状芯部は、銅もしくは銅合金及びこれら
と合金し難い材料よりなる粉末を配合してもよい。また
前記略棒状芯部が2本以上に分散して配置されて前記第
一層部により被覆されていてもよい。更には、前記略棒
状芯部は、前記第一層部により連続的に巻回されて被覆
され、或は接地電極の放電側端面がニッケル合金もしく
はニッケル−銅合金で被覆されていてもよい。Further, the substantially rod-shaped core portion may be compounded with a powder made of copper or a copper alloy and a material that is difficult to alloy with them. Further, the substantially rod-shaped core portions may be dispersedly arranged in two or more and covered with the first layer portion. Further, the substantially rod-shaped core portion may be continuously wound and covered by the first layer portion, or the discharge-side end face of the ground electrode may be covered with a nickel alloy or a nickel-copper alloy.
(作用) 接地電極の伸線長手方向に均一に、全長にわたって銅
或は銅合金よりなる略棒状芯部を封入することで、局部
的な銅の膨張の集中を解消することができ、また、外周
は2層のニッケル合金の熱応力による亀裂の発生を抑え
ることができるものであり、その上、先端から根元まで
銅が封入されていることで、効率良く熱をひくことがで
きる。そして、熱間静水圧押出しを利用した伸線加工で
製作するので、外筒部はインコネル600,601等の良耐食
性材料を使用することができる。その上、略棒状芯部が
複数に分散して封入されることで、エンジン装着時に発
生する銅の噴き出しや酸化を緩和することができる。更
に、略棒状芯部が銅及び銅と合金し難い材料、例えばク
ロムの混合粉末を配合することで、銅の酸化と噴き出し
をより軽減することが可能である。(Operation) By enclosing a substantially rod-shaped core portion made of copper or a copper alloy uniformly over the entire length in the wire drawing longitudinal direction of the ground electrode, local concentration of copper expansion can be eliminated. The outer periphery can suppress the occurrence of cracks due to the thermal stress of the two-layer nickel alloy. In addition, since copper is sealed from the tip to the root, heat can be efficiently drawn. And since it manufactures by wire drawing using hot isostatic extrusion, a good corrosion-resistant material, such as Inconel 600,601, can be used for an outer cylinder part. In addition, since the substantially bar-shaped core portion is dispersed and enclosed in a plurality, it is possible to alleviate copper spouting and oxidation that occur when the engine is mounted. Furthermore, by blending copper and a material in which the substantially rod-shaped core portion does not easily alloy with copper, for example, a mixed powder of chromium, it is possible to further reduce oxidation and ejection of copper.
加えて、この接地電極の使用環境がもっと厳しい条件
で、銅の酸化や噴き出しの問題がより顕著に起こる場合
は、先端部(放電側)をCO2レーザー、TIG溶接等で溶か
してニッケル−銅の合金層で被覆封着するかまたは、フ
ェージング等先尖形状にしてニッケル合金で被覆し、吹
き出しを抑制或は露出を少なくすることができる。In addition, if the problem of copper oxidation or bleeding occurs more remarkably under more severe conditions of use of this ground electrode, the tip (discharge side) is melted by CO 2 laser, TIG welding, etc. Or by coating with a nickel alloy in a pointed shape such as fading to suppress blowing or reduce exposure.
また、良熱伝導体である銅或は銅合金を連続的に均一
に配置されるので、接地電極の熱を効率良く主体金具を
介して放散でき、かつニッケル被覆部の亀裂の発生し難
い耐久性に優れたスパークプラグ用接地電極を、量産性
良く得る事ができる。In addition, since copper or copper alloy, which is a good heat conductor, is continuously and uniformly arranged, the heat of the ground electrode can be efficiently dissipated through the metal shell, and the nickel-coated portion is less likely to crack. It is possible to obtain a ground electrode for a spark plug having excellent properties with good mass productivity.
(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、この発明の実施例である内燃機関用スパーク
プラグであり、この内燃機関スパークプラグ(1)は軸
孔(4)の先端に中心電極(3)を具えると共に、上記
軸孔(4)内において端子電極(5)及び導電性ガラス
シール(7)によって狭持される抵抗体(6)の内封す
る絶縁体(2)と、内燃機関に取付けるときに螺合させ
るネジ部(9)により、上記中心電極(3)先端に対向
する位置に配置される接地電極(10)を有する主体金具
(8)から構成される。(Example) The present invention will be further described with reference to an example shown in the drawings.
(1) is a spark plug for an internal combustion engine according to an embodiment of the present invention. This internal combustion engine spark plug (1) has a center electrode (3) at the tip of a shaft hole (4) and the above-described shaft hole. (4) Insulator (2) enclosing a resistor (6) sandwiched by a terminal electrode (5) and a conductive glass seal (7) inside, and a screw portion to be screwed when mounted on an internal combustion engine According to (9), the metal shell (8) having the ground electrode (10) arranged at a position facing the tip of the center electrode (3).
実施例.1 この主体金具(8)のネジ部(9)の先端に一体に接
合される接地電極(10)は、銅もしくは銅合金よりなる
略棒状芯部(11)が、純ニッケルもしくはニッケル合金
よりなる第一層部により被覆され、前記第一層部がすく
なくとも1種以上の層からなるニッケル合金の第二層部
により被覆されていると共に、前記第一層部は第二層部
より良熱伝導体材料からなり、かつ、第二層部は第一層
部より耐食性の良好な材料から形成されてなるものであ
って、例えば、芯部(11)を室温での熱伝導率が300w/m
・k以上の良熱伝導材料である銅や銅合金を使用し、中
間層(12)には室温での熱伝導率が60〜120w/m・k程度
を確保するために、添加元素の総量が5%以下のニッケ
ル合金あるいは純ニッケルを使用し、さらに外皮材(1
3)は室温での熱伝導率が10〜30w/m・kの耐食ニッケル
合金(インコネル600,601等)から構成される複層構造
のクラッド材を用いる。Embodiment 1 The ground electrode (10) integrally joined to the tip of the screw portion (9) of the metal shell (8) has a substantially rod-shaped core (11) made of copper or a copper alloy made of pure nickel or nickel. The first layer portion is covered by a second layer portion of a nickel alloy comprising at least one or more layers, and the first layer portion is covered by a second layer portion. The second layer portion is formed of a material having better corrosion resistance than the first layer portion. For example, the core portion (11) has a thermal conductivity at room temperature that is good. 300w / m
・ Use copper or copper alloy, which is a good heat conductive material of k or more, and the total amount of added elements in order to secure the thermal conductivity at room temperature of about 60 to 120 w / m · k for the intermediate layer (12). Use nickel alloy or pure nickel of 5% or less,
For 3), a clad material having a multilayer structure composed of a corrosion-resistant nickel alloy (Inconel 600, 601 or the like) having a thermal conductivity of 10 to 30 w / mk at room temperature is used.
実施例.2 接地電極(10)を、最外周をクロム添加量が5wt%以
上のニッケル合金層(13)によって被覆し、その内側に
中間層(12)を筒状とすると共に純ニッケルあるいは総
添加量が5wt%以下のニッケル合金で形成し、この内部
空間内に良熱伝導性金属(18)(例えば、銅や銅の粉末
等)の外周を耐食性金属(19)(インコネル601、純ニ
ッケル等)によって被覆してなる円柱状クラッド材(1
4)を少なくとも2本以上(望ましくは7本以上)を内
部空間に配置させ、さらに空間の残余部(17)に純ニッ
ケルあるいは総添加元素量が5wt%以下のニッケル合金
(17)を充填させてなるものである(第4図〜第5
図)。Example 2 The outermost periphery of a ground electrode (10) is coated with a nickel alloy layer (13) containing 5% by weight or more of chromium, and an intermediate layer (12) is formed in a cylindrical shape inside the layer, and pure nickel or total nickel is added. It is formed of a nickel alloy having an addition amount of 5 wt% or less. In this internal space, the outer periphery of the good heat conductive metal (18) (for example, copper or copper powder) is coated with a corrosion-resistant metal (19) (Inconel 601, pure nickel). Columnar clad material (1)
4) At least 2 or more (preferably 7 or more) are placed in the internal space, and the remaining space (17) is filled with pure nickel or a nickel alloy (17) having a total added element amount of 5 wt% or less. (Figs. 4 to 5)
Figure).
この実施例は以上の構成を具えるので、燃焼室内にお
いて接地電極(10)が常時突出することによって高温と
なっても、外周をクロム添加量が5wt%以上のニッケル
合金層(13)によって被覆、密封する中間層(12)を、
純ニッケルあるいは総添加元素量が5wt%以下のニッケ
ル合金と共に、その内部に良熱伝導性金属(例えば、銅
や純ニッケル、或は銅及びクロムの粉末の混合物等)
(18)の外周を耐食性金属(インコネル601、純ニッケ
ル等)(19)によつて被覆してなる円柱状クラッド材
(14)を内包させるものであることから、この円柱状ク
ラッド材(14)の内部の良熱伝導性金属(18)及び中間
層(12)によって主体金具(9)方向へ熱を伝導させる
ことができるので、効率よく接地電極(10)の温度を下
げることができるものである。Since this embodiment has the above configuration, the outer periphery is covered with a nickel alloy layer (13) containing 5 wt% or more of chromium even if the temperature becomes high due to the ground electrode (10) constantly protruding in the combustion chamber. , Sealing middle layer (12),
Pure nickel or a nickel alloy with a total additive element content of 5 wt% or less, and a good heat conductive metal (for example, copper, pure nickel, or a mixture of copper and chromium powder) inside
Since the outer periphery of (18) is covered with a corrosion-resistant metal (Inconel 601, pure nickel, etc.) (19), a cylindrical clad material (14) is included therein. Since the heat can be conducted toward the metal shell (9) by the good heat conductive metal (18) and the intermediate layer (12) inside, the temperature of the ground electrode (10) can be reduced efficiently. is there.
実施例.3 接地電極(10)は、純ニッケル或は総添加元素量が5w
t%以下のニッケル合金あるいは純ニッケルからなる筒
体の中間層(12)の内部空間に、室温での熱伝導率が35
0w/m・k以上の良熱伝導材料の粉末(例えば、銅粉末
等)及びクロム粉末との混合粉末(15)を混合分散させ
て充填し、この筒体の中間層(12)の外周に、少くとも
1種類以上の、クロム添加量が5wt%以上のニッケル合
金による被覆層(13)によって被覆してなるものである
(第6図)。Embodiment 3 The ground electrode (10) is made of pure nickel or the total additive element amount is 5w.
In the inner space of the intermediate layer (12) of a cylinder made of nickel alloy or pure nickel of less than t%, the thermal conductivity at room temperature is 35%.
A powder (eg, copper powder, etc.) of a good heat conductive material of 0 w / m · k or more and a mixed powder (15) with chromium powder are mixed and dispersed and filled, and the outer periphery of the intermediate layer (12) of the cylindrical body is filled. And a coating layer (13) made of at least one kind of nickel alloy containing 5% by weight or more of chromium (FIG. 6).
この実施例は以上の構成を具えるので、接地電極(1
0)の受熱した熱は、この中間層(12)の内部空間に充
填される混合粉末(15)及び中間層(12)を介して主体
金具(9)方向に熱伝導されるので、接地電極(10)の
温度を下げることができる。さらにこの中間層(12)内
に充填される良熱伝導材料の粉末及びクロム粉末による
混合粉末(15)は予め混合分散されるので、混合粉末
(15)に含まれる良熱伝導材料の銅の露出部分を少なく
でき、酸化腐食を防止することができると共に、銅とク
ロムの合金化による熱伝導の低下を防ぐことが可能にな
るものである。Since this embodiment has the above configuration, the ground electrode (1
The heat received in (0) is conducted toward the metal shell (9) through the mixed powder (15) and the intermediate layer (12) filled in the inner space of the intermediate layer (12), so that the ground electrode (10) The temperature can be lowered. Further, the powder of the good heat conductive material and the mixed powder (15) of chromium powder filled in the intermediate layer (12) are mixed and dispersed in advance, so that the copper of the good heat conductive material contained in the mixed powder (15) is mixed. The exposed portion can be reduced, oxidation corrosion can be prevented, and a decrease in heat conduction due to alloying of copper and chromium can be prevented.
実施例.4 接地電極(10)を純ニッケルよりなる円柱状の芯部材
(16)の周囲に、純ニッケル及び銅或は銅合金からな
る、少くとも2種類以上の板状金属(20)を連続的に巻
回し、更にその外周を少くとも1種類以上の耐熱、耐食
金属の層(13)によって被覆してなるものである。(第
7図)。Example 4 At least two types of plate-like metals (20) made of pure nickel and copper or a copper alloy are provided around a cylindrical core member (16) made of pure nickel with a ground electrode (10). It is continuously wound, and its outer periphery is covered with at least one or more heat-resistant and corrosion-resistant metal layers (13). (FIG. 7).
この実施例は以上の構成を具えるので、燃焼室内にお
いて接地電極(10)が常時突出していても、良熱伝導性
金属の板状金属(20)が芯部材(16)に対して均一に巻
回されており、効率よく接地電極(10)の受けた熱を主
体金具(9)に伝達して放散することができるので、接
地電極(10)自体の温度を下げることができ、さらに、
この芯部材(16)の周囲に巻回される板状金属(20)の
外周を耐熱、耐食金属の層(13)によって被覆するもの
であるから、燃焼室内の燃焼に伴って接地電極(10)が
燃焼ガスに曝されても、良熱伝導性の金属である銅、純
ニッケル及びインコネル600等からなる板状金属(20)
が、酸化腐食されることを防ぐことができ、スパークプ
ラグ(1)に使用する接地電極(10)としての耐久性を
向上させることができるものとなる。Since this embodiment has the above configuration, even if the ground electrode (10) always protrudes in the combustion chamber, the plate-like metal (20) of the good heat conductive metal is uniformly applied to the core member (16). Since the wire is wound and the heat received by the ground electrode (10) can be efficiently transmitted to the metal shell (9) and dissipated, the temperature of the ground electrode (10) itself can be lowered.
Since the outer periphery of the plate-shaped metal (20) wound around the core member (16) is covered with the layer of heat-resistant and corrosion-resistant metal (13), the ground electrode (10) is burned in the combustion chamber. ) Is a plate-like metal made of copper, pure nickel, Inconel 600, etc., which have good thermal conductivity even when exposed to combustion gas (20)
However, it is possible to prevent oxidation and corrosion, and to improve the durability as a ground electrode (10) used for the spark plug (1).
また、芯部材(16)の外周に連続的に巻回される板状
金属(20)のうち、少くとも1種類を純ニッケル、銅合
金、あるいは純銅のうちいずれかからなるものとし、さ
らにその外周を被覆する耐熱、耐食性に優れた金属層
(13)を、クロム添加量5wt%以上のニッケル合金によ
って被覆してなるものとすることによって、接地電極
(10)の主体金具(9)等への熱伝導性をさらに向上さ
せることができる。Further, at least one of the plate-like metals (20) continuously wound around the outer periphery of the core member (16) is made of any one of pure nickel, copper alloy, and pure copper. The metal layer (13) with excellent heat and corrosion resistance covering the outer periphery is coated with a nickel alloy containing 5 wt% or more of chromium, so that it can be used as a metal shell (9) for the ground electrode (10). Can be further improved in thermal conductivity.
なお、実施例1〜4に示すこれら接地電極(10)は、
後述実施例.5に示すように製造されるものである。Note that these ground electrodes (10) shown in Examples 1 to 4
It is manufactured as shown in Example 5 below.
実施例・5 接地電極(10)を構成するクラッド材を、第8図に示
すように、800〜1000℃の温度領域において圧力媒体を
介して押出しを行う熱間静水圧押出によって製造する
(同図,イ)。この熱間静水圧押出によることで、難加
工性材料であるニッケル合金の成形を容易にすると共
に、芯部(11)、中間層(12)、外皮材(金属層)(1
3)及び中間層(12)と外皮材(13)の各々の接合面に
於いて、強力な一種の固相結合が生じ、これらは強固に
結合するものである。そして、このクラッド材をφ2.6m
mに伸線加工した後(同図,ロ)、ロール加工或は平角
ダイスによって断面長方形状(1.6mm×2.8mm)とする
(同図,ハ)。Example 5 A clad material constituting a ground electrode (10) is manufactured by hot isostatic extrusion in which extrusion is performed through a pressure medium in a temperature range of 800 to 1000 ° C. as shown in FIG. Fig. B). This hot isostatic extrusion facilitates the molding of nickel alloys, which are difficult-to-work materials, and also enables the core (11), the intermediate layer (12), and the outer shell (metal layer) (1).
At the joint surfaces of the intermediate layer (3) and the intermediate layer (12) and the outer cover material (13), a kind of strong solid-phase bonding occurs, and these are firmly bonded. And this clad material is φ2.6m
After wire drawing to m (b in the same figure), it is formed into a rectangular cross section (1.6 mm x 2.8 mm) by roll processing or a flat die (c in the same figure).
実施例.6 実施例5の接地電極(10)先端の露出する銅材芯部
(11)の酸化腐食が顕著の場合、同図,ハの平角線を所
定寸法に切断後(同図,ニ)、少くとも一端をテーパー
形状とするスェージングを行っても良い(同図,ホ)。
このとき、クラッド材はその層間において強力な固相結
合を持って接合しているので加工によって剥離等を生じ
ることはないものであるが、クラッド材に対してスェー
ジングを行う場合、芯部(11)を構成する銅及び銅合金
が酸化され易いものであるから、両端部から芯部(11)
が露出しないようにすることが必要となる。Embodiment 6 In the case where the oxidized corrosion of the exposed copper core (11) at the tip of the ground electrode (10) of Embodiment 5 is remarkable, cut the rectangular wire of FIG. ), Swaging may be performed so that at least one end is tapered (FIG. 3E).
At this time, since the clad material is bonded with a strong solid phase bond between the layers, there is no occurrence of separation or the like due to processing, but when the clad material is swaged, the core (11 ), The copper and copper alloy are easily oxidized.
Must not be exposed.
実施例.7 実施例1〜実施例6の良熱伝導体の露出部を封着をCO
2レーザー、アルゴン溶接で実施する時はより良好な封
着を得ることができる。Example 7 The exposed portion of the good heat conductor of Examples 1 to 6 was sealed with CO.
2) When using laser and argon welding, better sealing can be obtained.
(発明の効果) 以上のとおり、内部に良熱伝導性材料を封入し、外表
層に耐食性に優れた少くとも2種以上のニッケル合金を
配置する接地電極を使用することで、スパークプラグ自
体の耐久性を向上させ、高温時における接地電極に起因
するプレイグニッションを防止することができる優れた
効果を有するものである。(Effect of the Invention) As described above, by using a ground electrode in which a good heat conductive material is sealed inside and at least two types of nickel alloys having excellent corrosion resistance are arranged on the outer surface layer, the spark plug itself can be used. This has an excellent effect of improving durability and preventing pre-ignition caused by the ground electrode at high temperatures.
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、第3
図、第5図、第6図と第7図はその他の実施例である接
地電極の縦断面図、第4図は第5図の拡大図であり、第
8図はこの発明の接地電極の製造方法を示した模式図で
ある。 1……内燃機関用スパークプラグ、2……絶縁体、3…
…中心電極、4……軸孔 5……端子電極、6……抵抗体、7……導電性ガラスシ
ール、8……主体金具 9……ネジ部、10……接地電極、11……芯部、12……中
間層 13……外皮材(金属層)、14……円柱状クラッド材FIG. 1 is a partial sectional view of a spark plug for an internal combustion engine according to an embodiment of the present invention, FIG.
FIGS. 5, 5, 6 and 7 are longitudinal sectional views of a ground electrode according to another embodiment, FIG. 4 is an enlarged view of FIG. 5, and FIG. It is the schematic diagram which showed the manufacturing method. 1 ... spark plug for internal combustion engine, 2 ... insulator, 3 ...
... Center electrode, 4 ... Shaft hole 5 ... Terminal electrode, 6 ... Resistor, 7 ... Conductive glass seal, 8 ... Metal shell 9 ... Screw, 10 ... Ground electrode, 11 ... Core Part, 12… middle layer 13… skin material (metal layer), 14… cylindrical clad material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡山 勉 愛知県名古屋市瑞穂区高辻町14番18号 日本特殊陶業株式会社内 (72)発明者 石川 雅啓 愛知県名古屋市瑞穂区高辻町14番18号 日本特殊陶業株式会社内 (72)発明者 野口 昌孝 神奈川県秦野市千村89―9 (72)発明者 山田 忠昭 神奈川県鎌倉市七里が浜2丁目27―10 (56)参考文献 特開 昭63−138681(JP,A) 特開 平2−295085(JP,A) 特開 昭61−143974(JP,A) 特開 昭51−55832(JP,A) 特開 昭55−163786(JP,A) 特開 昭58−141355(JP,A) 特公 昭60−43897(JP,B2) (58)調査した分野(Int.Cl.6,DB名) H01T 13/00 - 13/56 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Okayama 14-18 Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture Inside Japan Specialty Ceramics Co., Ltd. (72) Masahiro Ishikawa 14-18 Takatsuji-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture No. Japan Special Ceramics Co., Ltd. (72) Inventor Masataka Noguchi 89-9 Chimura, Hadano-shi, Kanagawa Prefecture JP-138681 (JP, A) JP-A-2-295085 (JP, A) JP-A-61-143974 (JP, A) JP-A-51-55832 (JP, A) JP-A-55-163786 (JP, A) JP-A-58-141355 (JP, A) JP-B-60-43897 (JP, B2) (58) Fields investigated (Int. Cl. 6 , DB name) H01T 13/00-13/56
Claims (6)
純ニッケルもしくはニッケル合金よりなる第一層部によ
り被覆され、前記第一層部がすくなくとも1種以上の層
からなるニッケル合金の第二層部により被覆されている
と共に、前記第一層部は第二層部より良熱伝導材料から
なり、かつ、第二層部は第一層部より耐食性の良好な材
料から形成されてなる接地電極を有するスパークプラ
グ。1. A substantially rod-shaped core made of copper or a copper alloy,
The first layer portion is coated with a first layer portion made of pure nickel or a nickel alloy, and the first layer portion is coated with a second layer portion of a nickel alloy composed of at least one or more layers, and the first layer portion is formed of a first layer portion. A spark plug having a ground electrode made of a better heat conductive material than a two-layer part and a second layer part made of a material having better corrosion resistance than the first layer part.
まれる軸孔付き絶縁体と、該絶縁体の軸孔に固定される
中心電極と、前記主体金具の先端面に溶接され、前記中
心電極との間で放電間隙を形成する接地電極を有するス
パークプラグであって、前記接地電極の外表面は、銅も
しくは銅合金よりなる略棒状芯部を被覆する第一層部の
純ニッケルもしくはニッケル合金を前記第一層部よりも
耐食性の良好なニッケル合金よりなる第2層部により被
覆され形成されてなる接地電極を有するスパークプラ
グ。2. A substantially cylindrical metal shell, an insulator with a shaft hole fitted into the metal shell, a center electrode fixed to the shaft hole of the insulator, and welded to a tip end surface of the metal shell. A spark plug having a ground electrode forming a discharge gap with the center electrode, wherein an outer surface of the ground electrode has a first layer of pure nickel covering a substantially rod-shaped core made of copper or a copper alloy. Alternatively, a spark plug having a ground electrode formed by coating a nickel alloy with a second layer portion made of a nickel alloy having better corrosion resistance than the first layer portion.
これらと合金化し難い材料よりなる粉末を配合する請求
項(1)又は(2)記載の接地電極を有するスパークプ
ラグ。3. A spark plug having a ground electrode according to claim 1, wherein said substantially rod-shaped core portion contains a powder made of copper or a copper alloy and a material which is difficult to alloy with them.
散して配置され、該略棒状芯部が前記第一層部により被
覆されてなる請求項(1)〜(3)記載の接地電極を有
するスパークプラグ。4. The substantially bar-shaped core portion is dispersed and arranged in at least two or more rods, and the substantially bar-shaped core portion is covered with the first layer portion. Spark plug having a ground electrode.
続的に巻回されて被覆されてなる請求項(1)〜(3)
記載の接地電極を有するスパークプラグ。5. The method according to claim 1, wherein the substantially rod-shaped core portion is continuously wound and covered by the first layer portion.
A spark plug having the ground electrode according to the above.
くはニッケル−銅合金で被覆されている請求項(1)〜
(5)記載の接地電極を有するスパークプラグ。6. The method according to claim 1, wherein the discharge-side end face of the ground electrode is coated with a nickel alloy or a nickel-copper alloy.
(5) A spark plug having the ground electrode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14982690A JP2923672B2 (en) | 1990-06-11 | 1990-06-11 | Spark plug ground electrode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14982690A JP2923672B2 (en) | 1990-06-11 | 1990-06-11 | Spark plug ground electrode |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0443585A JPH0443585A (en) | 1992-02-13 |
JP2923672B2 true JP2923672B2 (en) | 1999-07-26 |
Family
ID=15483533
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14982690A Expired - Fee Related JP2923672B2 (en) | 1990-06-11 | 1990-06-11 | Spark plug ground electrode |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2923672B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11990731B2 (en) | 2019-04-30 | 2024-05-21 | Federal-Mogul Ignition Llc | Spark plug electrode and method of manufacturing same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0673072B2 (en) * | 1986-04-28 | 1994-09-14 | シャープ株式会社 | Video processor for still images |
JP4283347B2 (en) * | 1997-11-20 | 2009-06-24 | 日本特殊陶業株式会社 | Spark plug |
JP6230348B2 (en) * | 2013-09-13 | 2017-11-15 | 日本特殊陶業株式会社 | Spark plug |
JP6280899B2 (en) * | 2015-08-31 | 2018-02-14 | 日本特殊陶業株式会社 | Spark plug |
-
1990
- 1990-06-11 JP JP14982690A patent/JP2923672B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11990731B2 (en) | 2019-04-30 | 2024-05-21 | Federal-Mogul Ignition Llc | Spark plug electrode and method of manufacturing same |
Also Published As
Publication number | Publication date |
---|---|
JPH0443585A (en) | 1992-02-13 |
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