JPH0443585A - Ground electrode for spark plug - Google Patents
Ground electrode for spark plugInfo
- Publication number
- JPH0443585A JPH0443585A JP14982690A JP14982690A JPH0443585A JP H0443585 A JPH0443585 A JP H0443585A JP 14982690 A JP14982690 A JP 14982690A JP 14982690 A JP14982690 A JP 14982690A JP H0443585 A JPH0443585 A JP H0443585A
- Authority
- JP
- Japan
- Prior art keywords
- ground electrode
- copper
- nickel
- spark plug
- alloy
- 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
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 29
- 239000010949 copper Substances 0.000 claims description 28
- 229910052802 copper Inorganic materials 0.000 claims description 27
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 238000005491 wire drawing Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 42
- 229910052751 metal Inorganic materials 0.000 abstract description 30
- 239000002184 metal Substances 0.000 abstract description 30
- 239000011162 core material Substances 0.000 abstract description 20
- 229910052759 nickel Inorganic materials 0.000 abstract description 20
- 239000010410 layer Substances 0.000 abstract description 18
- 230000007797 corrosion Effects 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 15
- 238000002485 combustion reaction Methods 0.000 abstract description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 12
- 239000004020 conductor Substances 0.000 abstract description 4
- 239000002344 surface layer Substances 0.000 abstract description 2
- 229910052804 chromium Inorganic materials 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- 150000002739 metals Chemical class 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000005253 cladding Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 229910001026 inconel Inorganic materials 0.000 description 4
- 229910001055 inconels 600 Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011812 mixed powder Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002470 thermal conductor Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007858 starting material 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の接
地電極に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a ground electrode for a spark plug used in an internal combustion 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、−船釣
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って発生
する、圧縮工程におけるプレイグニツシヨンを防止する
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
ル合金のクラツ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、その外層部にりロムを１０％以上含有する
ニッケル合金を設けてなるもの（特開昭６０−４１７８
５号）が提案されている。(Prior art) Conventionally, the ground electrode of spark plugs used in internal combustion engines consists of a single layer of nickel alloy, and is used for boat fishing, but with the recent improvement in the performance of internal combustion engines, In order to prevent pre-ignition during the compression process caused by the ground electrode constantly protruding into the combustion chamber, it has become necessary to use materials with good thermal conductivity. For the ground electrode of the layer, there are those that use a cladding material of a nickel alloy with a multilayer structure with copper sealed inside (Japanese Patent Application Laid-open No. 140985/1985), and those that use pure nickel as the core material. (Japanese Unexamined Patent Publication No. 60-4178
No. 5) has been proposed.
（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ツド材からなるもの
とするが、塑性加工の工程で１本ずつ成型加工を要する
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
に最も有利な長手方向に全体に均一に封入されがたい。(Problem to be Solved by the Invention) However, in the above-mentioned conventional method,
In the case of No. 140985, the ground electrode is made of a multi-layered nickel alloy clad material with copper sealed inside, but mass production is poor because it requires molding one by one in the plastic working process. Alternatively, the position and shape of the copper encapsulated are restricted due to the layout of plastic working, and it is difficult to encapsulate the copper uniformly throughout the length in the longitudinal direction, which is most advantageous for heat dissipation.
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、塑性加工で成型するので、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。In addition, there is a problem that cracks occur in the nickel part due to the difference in thermal expansion between copper and nickel in areas where the enclosed volume is locally large. Furthermore, since the molding is done by plastic working, it is difficult to use corrosion-resistant nickel alloys such as Inconel 600 or 601 as the 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、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
グニツシヨンを誘発し、内燃機関を損傷し易いものであ
る。Furthermore, in the case of JP-A No. 60-41785, the core material is made of pure nickel, and the outer layer covering the outer surface is provided with a nickel alloy containing 10% or more of chromium. The purpose is to minimize the difference in coefficient of linear expansion between the ground electrode and the outer layer, minimize the generation of thermal stress even when the ground electrode becomes high temperature, and prevent damage to the ground electrode. Since the pure nickel used as the core material has low thermal conductivity, the ground electrode itself does not have sufficient thermal conductivity, which may cause pre-ignition caused by the ground electrode and cause the internal combustion engine to It 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
するクラツド材からなるものとし良熱伝導性を確保し、
更に上記クラツド材を容易に得ることができるようにす
るものである（課題を解決するための手段）
そのために、少くとも１種類以上のニッケル合金と伸線
長手方向に連続的に銅もしくは銅合金を含む複合材から
なり、上記鋼もしくは銅合金及びこれらと合金し難い材
料の２種類以上の粉末を出発材料とするか、２本以上分
散して配置され、又は、層状に分散されている複合材か
ら構成され、更に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−銅合金で被覆されるものとしたも
のである。Therefore, the present invention aims to improve the above-mentioned drawbacks of the conventional spark plug, and the ground electrode of the spark plug is made of a clad material having multiple layers to ensure good thermal conductivity.
Furthermore, it is possible to easily obtain the above-mentioned clad material (means for solving the problem).For this purpose, at least one kind of nickel alloy and copper or copper alloy are added continuously in the longitudinal direction of the wire drawing. A composite material containing powders of two or more of the above-mentioned steel or copper alloy and materials that are difficult to alloy with these as starting materials, or two or more powders are dispersed or dispersed in a layered manner. Furthermore, the discharge side end surface of the ground electrode is coated 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。(Function) By enclosing copper or copper alloy uniformly over the entire length of the ground electrode in the drawing longitudinal direction, it is possible to eliminate local concentration of copper expansion, and also to reduce the thermal stress of the outer nickel alloy. In addition, since it is filled with copper from the tip to the base, it can efficiently dissipate heat.
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、その上、銅は、層状或は
繊維状に分散して封入されるので、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出来る上、
更に銅とクロムの混合粉末を繊維状に封入することで銅
の酸化と噴き出しをより軽減することが可能である。Since it is manufactured by wire drawing using hot isostatic extrusion, the outer cylinder part can be made of highly corrosion-resistant materials such as Inconel 600.601, and in addition, the copper can be formed into layers or fibers. Since it is dispersed and sealed, it is possible to reduce the blow-out and oxidation of copper that occurs when the engine is installed, and
Furthermore, by enclosing a mixed powder of copper and chromium in the form of fibers, it is possible to further reduce copper oxidation and spouting.
加えて、この接地電極の使用環境がもつと厳しい条件で
、銅の酸化や鳴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−、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
、スェージング等先尖形状にして噴き出しを抑制或は露
出を少なくすることが出来る。In addition, if the environment in which this ground electrode is used is harsh and problems such as copper oxidation and squealing occur more prominently, the tip (discharge side) may be melted using CO2 laser or TIG welding to remove nickel. - Splashing can be suppressed or exposure can be reduced by covering and sealing with a copper alloy layer or by using a pointed shape such as swaging.
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ｘｉの熱を効率良く主体金具を介
して放散でき、且つニッケル被覆部の亀裂の発生のおき
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 thermal conductor, is arranged continuously and uniformly, the heat of the ground xi can be efficiently dissipated through the metal shell, and cracks in the nickel coating are less likely to occur. Ground electrodes for spark plugs with excellent durability can be obtained with good mass production.
（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、この内燃機関用スパークプラグ（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）によって挟持される抵抗体（６）を内封する絶縁
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（ｌＯ）を有する主体金具（８
）から構成される。(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 the invention, and this spark plug for an internal combustion engine (1) has a shaft hole (4
) is provided with a center electrode (3) at the tip thereof, and the shaft hole (
4) An insulator (2) enclosing a resistor (6) sandwiched between a terminal electrode (5) and a conductive glass seal (7), and a threaded portion (9) to be screwed together when installing the internal combustion engine. ), the metal shell (8
).
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、芯部（１１）を室温での熱
伝導率が３００ｗ／ｍ−に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−に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（１３）は室温での熱伝導
率が１０〜３０ ｗ ／ 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
のクラツド材を用いる。Example 1 The ground electrode (10) which is integrally joined to the tip of the threaded part (9) of this metal shell (8) has a core part (11) with a thermal conductivity of 300 w/m or more at room temperature. Copper or copper alloy, which is a material with good thermal conductivity, is used, and the total amount of additive elements is 5% in order to ensure a thermal conductivity of 60 to 120 w/m at room temperature for the intermediate layer (12). The following nickel alloy or pure nickel is used, and the outer skin material (13) is made of a corrosion-resistant nickel alloy (13) with a thermal conductivity of 10 to 30 w/m・k at room temperature.
A multi-layered cladding material made of Inconel 600, 601, etc.) is used.
実施例、２
接地電極（ｌＯ）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
に芯材（１２）を筒状とすると共に純二、ツケルあるい
は総添加量が５ ｗ ｔ％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
柱状クラツド材（１４）を少なくとも２本以上（望まし
くは７本以上）を内部空間に配設させ、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５
ｗ ｔ％以下のニッケル合金（１８）を充填させてなる
ものである（第４図ないし第５図）。Example 2 Ground electrode (lO) with chromium addition amount of 5wt% on the outermost periphery
It is coated with the above nickel alloy layer (13), and inside the core material (12) is formed into a cylinder, and is made of nickel alloy with a total addition amount of 5 wt% or less, and inside this inner space. Good thermal conductivity metal (18) (e.g.
At least two (preferably seven or more) cylindrical cladding materials (14) made of a corrosion-resistant metal (19) (Inconel 601, pure nickel, etc.) coated with a corrosion-resistant metal (19) (inconel 601, pure nickel, etc.) are installed in the internal space. Furthermore, pure nickel or a total amount of added elements of 5 is placed in the remaining space (17).
It is filled with a nickel alloy (18) of less than wt% (Figures 4 and 5).
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（ｌＯ）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、密封する芯材（１２）
を、純ニッケルあるいは総添加元素量が５ ｗ ｔ％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） （１ｇ）の外周を耐食性金属（インコネル６
０１、純ニッケル等） （１９）によって被覆してなる
円柱状クラツド材（Ｉ４）を内包させるものであること
から、この円柱状クラツド材（１４）の内部の良熱伝導
性金属（１９）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（ｌＯ）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, even if the ground electrode (lO) constantly protrudes inside the combustion chamber and becomes high temperature, the outer periphery is covered with a nickel alloy layer (13) containing 5 wt% or more of chromium. , sealing core material (12)
with pure nickel or a nickel alloy with a total added element content of 5 wt% or less, and a metal with good thermal conductivity (
For example, the outer periphery of copper, pure nickel, or a mixture of copper and chromium powder (1 g) is coated with a corrosion-resistant metal (Inconel 6).
01, pure nickel, etc.) (19), the good heat conductive metal (19) inside the columnar cladding material (14) Since heat can be conducted toward the metal shell (9), the temperature of the ground electrode (lO) can be efficiently lowered.
実施例、３
接地電極（ｌＯ）は、純ニッケル或は総添加元素量が５
ｗ ｔ％以下のニッケル合金あるいは純ニッケルから
なる筒体の芯材（１２）の内部空間に、室温での熱伝導
率が３５０ｗ／ｍ−に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、この筒体の芯材（１２）の外周
に、少くとも１種類以上の、クロム添加量が５ ｗ ｔ
％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）。Example 3 The ground electrode (lO) is made of pure nickel or the total amount of added elements is 5
Powder of a good thermally conductive material (for example, copper powder) having a thermal conductivity of 350 w/m or more at room temperature is placed in the inner space of the core material (12) of the cylinder made of a nickel alloy or pure nickel with a content of less than wt%. etc.) and chromium powder are mixed and dispersed and filled, and the outer periphery of the core material (12) of this cylinder is filled with at least one type of chromium added in an amount of 5 wt.
% or more of a nickel alloy (FIG. 6).
この実施例は以上の構成を具えるので、接地電極（ｌＯ
）の受熱した熱は、この芯材（１２）の内部空間に充填
される混合粉末（１５）及び芯材（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（ｌＯ）
の温度を下げることができる。さらにこの芯材（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
になるものである実施例、４
接地電極（ｌＯ）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）。Since this embodiment has the above configuration, the ground electrode (lO
The heat received by the ground electrode ( lO)
temperature can be lowered. Furthermore, this core material (12)
Since the mixed powder (15) of the good heat conductive material powder and chromium powder filled in the inside is mixed and dispersed in advance, the exposed portion of the copper of the good heat conductive material contained in the mixed powder (15) can be reduced, and the chromium powder is not oxidized. Embodiment 4 The grounding electrode (1O) is made of a cylindrical core member made of pure nickel (4) which can prevent corrosion and also prevent a decrease in thermal conductivity due to alloying of copper and chromium. 16) At least two or more types of plate metals (20) made of pure nickel and copper or copper alloys are continuously wound around the metal plate (20), and the outer periphery is further covered with at least one type of heat-resistant and corrosion-resistant metal. It is coated with a layer (13) of (
Figure 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（ｌＯ）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（ｌＯ）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（１７）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（ｌＯ）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）は、酸化腐食することを防ぐこと
ができ、スパークプラグ（１）に使用する接地電極（ｌ
Ｏ）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-mentioned configuration, even if the ground electrode (lO) always protrudes inside the combustion chamber, the plate-shaped metal (20) made of a metal with good thermal conductivity is uniformly attached to the core member (16). Since the heat received by the ground electrode (lO) can be efficiently transferred to the metal shell (9) and dissipated, the temperature of the ground electrode (10) itself can be lowered.
Furthermore, since the outer periphery of the metal plate (17) wound around the core member (16) is coated with a layer (13) of heat-resistant and corrosion-resistant metal, the ground electrode Even if (lO) is exposed to combustion gas, the plate metal (20) made of copper, pure nickel, Inconel 600, etc., which are metals with good thermal conductivity, can prevent oxidation corrosion, and the spark plug (1) Ground electrode (l
The durability as O) can be improved.
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５ ｗ ｔ％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（ｌＯ）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。Furthermore, at least one of the plate metals (20) continuously wound around the outer periphery of the core member (16) is made of pure nickel, copper alloy, or pure copper,
Furthermore, by coating the outer periphery of the metal layer (13) with excellent heat resistance and corrosion resistance using a nickel alloy containing 5 wt% or more of chromium, the metal shell (13) of the ground electrode (lO) is 9) etc. can be further improved.
なお、実施例１〜４に示すこれら接地電極（ｌＯ）は、
後述実施例、５に示すように製造されるものである。In addition, these ground electrodes (lO) shown in Examples 1 to 4 are as follows:
It is manufactured as shown in Example 5 below.
実施例、５
接地電極（１０）を構成するクラツド材を、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
） （１３）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、このクラツ
ド材をφ２．６關に伸線加工した後（同図１口）、ロー
ル加工或は平角ダイスによって断面長方形状（１，６ｍ
ｍｘ２．８ｍｍ）とする（同図、ハ）。Example 5 The clad material constituting the ground electrode (10) is manufactured by hot isostatic extrusion in which extrusion is performed via a pressure medium in a temperature range of 800 to 1000°C, as shown in Figure 8. Figure, a). By this hot isostatic extrusion,
In addition to facilitating the molding of nickel alloy, which is a difficult-to-process material, the core (11), intermediate layer (12), outer skin material (metal layer) (13), and the intermediate layer (12) and outer skin material (13) are A type of strong solid-phase bond occurs at each joint surface, and these bond firmly. Then, after drawing this clad material to a diameter of 2.6 mm (1 hole in the figure), it is rolled into a rectangular cross section (1.6 m) using a roll process or a flat die.
m x 2.8 mm) (Figure C).
実施例、６
実施例５の接地電極（ｌＯ）の鋼部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、二
）、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）。Example 6 If the steel part of the ground electrode (lO) in Example 5 has significant oxidation corrosion, after cutting the rectangular wire shown in Figure C to a predetermined size (Figure 2), at least one end should be tapered. You may also perform swaging (see Figure 5).
このとき、クラツド材はその眉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、クラツド材に対してスェー
ジングを行う場合、芯部（ｌ］）を構成する銅及び銅合
金が酸化され易いものであることから、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。At this time, the clad material is bonded with a strong solid phase bond between the eyebrows, so no peeling occurs during processing, but when swaging the clad material, the core (l) ]) Since the copper and copper alloy constituting the core are easily oxidized, it is necessary to prevent the core (11) from being exposed from both ends.
実施例、７
実施例１〜実施例６の良熱伝導体の露出部の封着をＣＯ
２レーザ−、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 parts of the good thermal conductors of Examples 1 to 6 were sealed with CO.
Better sealing can be obtained when performing 2 laser and argon welding.
（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
るプレイグニツシヨ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。(Effects of the invention) As described above, by using a grounding electrode in which a material with good thermal conductivity is sealed inside and at least two or more kinds of nickel alloys with excellent corrosion resistance are arranged on the outer surface layer, the spark plug itself can be This has the 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
） ４・・・円柱状クラツド材
特許出願人 日本特殊陶業株式会社同
株式会社 神戸製鋼所
代理人 弁理士 藤 木 三 幸
第
図
第
図
１り
第
図
第
図
第
図FIG. 1 is a partial cross-sectional view of a spark plug for an internal combustion engine which is an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part thereof, and FIG.
5, 6 and 7 are longitudinal sectional views of other embodiments of the grounding electrode, FIG. 4 is an enlarged view of FIG. 5, and FIG. 8 is an enlarged view of the grounding electrode of the present invention. It is a schematic diagram showing a 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...Threaded part 10...Grounding electrode 11...
・Core 12...Middle layer 13...Outer skin material (metal layer) 4...Cylindrical clad material Patent applicant: NGK Spark Plug Co., Ltd.
Kobe Steel Co., Ltd. Agent Patent Attorney Miyuki Fujiki
Claims (5)
内部に伸線長手方向に連続的に銅もしくは銅合金を含む
複合材からなる接地電極を有するスパークプラグ。(1) A spark plug having a ground electrode made of at least two or more types of nickel alloys and a composite material containing copper or copper alloys therein continuously in the longitudinal direction of the wire drawing.
の２種類以上の粉末を出発原料とした複合材からなる請
求項（１）記載の接地電極を有するスパークプラグ。(2) A spark plug having a ground electrode according to claim (1), which is made of a composite material starting from powders of two or more types of copper, copper alloys, and materials that are difficult to alloy.
配置された複合材よりなる請求項（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) or (2), which is made of a composite material in which at least two or more pieces of copper or copper alloy are distributed and arranged.
複合材からなる請求項（１）記載の接地電極を有するス
パークプラグ。(4) A spark plug having a ground electrode according to claim (1), which is made of a composite material in which copper or a copper alloy is dispersed in layers.
ニッケル合金もしくはニッケル−銅合金で被覆されてい
る請求項（１）〜（４）記載の接地電極を有するスパー
クプラグ。(5) A spark plug having a ground electrode according to any one of claims (1) to (4), wherein the discharge side end face of the ground electrode is mechanically or thermally coated with a nickel alloy or a nickel-copper alloy.
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 true JPH0443585A (en) | 1992-02-13 |
| JP2923672B2 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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62254184A (en) * | 1986-04-28 | 1987-11-05 | シャープ株式会社 | Video processor for still image |
| US6121719A (en) * | 1997-11-20 | 2000-09-19 | Ngk Spark Plug Co., Ltd. | Spark plug having a multi-layered electrode |
| JP2015056343A (en) * | 2013-09-13 | 2015-03-23 | 日本特殊陶業株式会社 | Spark plug |
| JP2017050096A (en) * | 2015-08-31 | 2017-03-09 | 日本特殊陶業株式会社 | Spark plug |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112020002185T5 (en) | 2019-04-30 | 2022-04-07 | Federal-Mogul Ignition Llc | SPARK PLUG ELECTRODE AND METHOD OF MAKING SAME |
-
1990
- 1990-06-11 JP JP14982690A patent/JP2923672B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62254184A (en) * | 1986-04-28 | 1987-11-05 | シャープ株式会社 | Video processor for still image |
| US6121719A (en) * | 1997-11-20 | 2000-09-19 | Ngk Spark Plug Co., Ltd. | Spark plug having a multi-layered electrode |
| JP2015056343A (en) * | 2013-09-13 | 2015-03-23 | 日本特殊陶業株式会社 | Spark plug |
| JP2017050096A (en) * | 2015-08-31 | 2017-03-09 | 日本特殊陶業株式会社 | Spark plug |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2923672B2 (en) | 1999-07-26 |
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