JPH02253587A - Spark plug for internal combustion engine - Google Patents
Spark plug for internal combustion engineInfo
- Publication number
- JPH02253587A JPH02253587A JP7385189A JP7385189A JPH02253587A JP H02253587 A JPH02253587 A JP H02253587A JP 7385189 A JP7385189 A JP 7385189A JP 7385189 A JP7385189 A JP 7385189A JP H02253587 A JPH02253587 A JP H02253587A
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- internal combustion
- carbon
- combustion engine
- spark plug
- 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 21
- 239000012212 insulator Substances 0.000 claims abstract description 45
- 239000004065 semiconductor Substances 0.000 claims abstract description 22
- 239000005871 repellent Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000002940 repellent Effects 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 24
- 239000000446 fuel Substances 0.000 abstract description 6
- 238000011109 contamination Methods 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 229920002545 silicone oil Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- HTXDPTMKBJXEOW-UHFFFAOYSA-N iridium(IV) oxide Inorganic materials O=[Ir]=O HTXDPTMKBJXEOW-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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）
こめ発明は、内燃機関に使用されるスパークプラグに関
する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to 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においては
、始動から暖機終了までは混合気を濃くすることから、
燃料の燃焼に伴って発生するカーボンが液状燃料によっ
て絶縁体の脚部に大量に付着することがあり、この絶縁
体脚部へのカーボンの付着が電気的な力（印加電圧）に
伴って配列して、脚部基部のアース側から先端に向かっ
てカーボン路が進展して絶縁体の絶縁抵抗の低下を生じ
、内燃機関の不調の原因となるものであることから、こ
の付着したカーボンを除去し、絶縁体自体による自己清
浄作用を促進するために、絶縁体の脚部長を長くするこ
とによって、絶縁抵抗の低下を防止しなり、撥水性の高
いシリコンオイル等の物質を絶縁体表面や主体金具の内
壁に塗布することによってカーボン自体の付着を防止し
ている。(Prior Art) Conventionally, spark plugs used in internal combustion engines enrich the air-fuel mixture from start to end of warm-up.
A large amount of carbon generated as a result of fuel combustion may adhere to the legs of the insulator due to liquid fuel, and this carbon adhesion to the legs of the insulator may be arranged in accordance with electrical force (applied voltage). Then, the carbon path develops from the ground side of the base of the leg toward the tip, causing a decrease in the insulation resistance of the insulator, which can cause malfunctions in the internal combustion engine, so this adhering carbon is removed. However, in order to promote the self-cleaning effect of the insulator itself, the legs of the insulator are lengthened to prevent a drop in insulation resistance. By applying it to the inner wall of the metal fittings, it prevents the carbon itself from adhering.
（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、絶縁体表面温
度を上昇し易いように、脚部長を長くする場合には、燃
料の燃焼によるカーボンの付着に対しては絶縁体の絶縁
抵抗を維持することができるので耐汚損性に効果をもな
らすものとなるが、絶縁体脚部が長くなるとプレイグニ
ツシヨンが発生し易く、耐熱性の面で自らその長さにも
限界があった。さらに、撥水性の高いシリコンオイル等
の物質を絶縁体表面や主体金具の内壁に塗布するものに
おいては、高温の燃焼ガスに曝されると、絶縁体の脚部
表面や主体金具の内壁に塗布される撥水性の高いシリコ
ンオイル等の物質は、徐々にシリコンオイル等が蒸発し
てしまうので、カーボン付着に対する効果は短期間に失
われる欠点がある。そこで、この発明は上記従来のもの
の持つ欠点を改善するものであり、燃焼に伴って発生す
るカーボンの絶縁体脚部等への付着を防ぐことによって
、絶縁抵抗の低下を防ぎ、スパークプラグの確実な点火
を維持できるようにするものである。(Problem to be Solved by the Invention) However, in the above-mentioned conventional device, when the leg length is made long to easily increase the surface temperature of the insulator, the insulator The insulation resistance of the insulator can be maintained, which is effective in terms of stain resistance, but the longer the insulator legs become, the more likely preignition will occur, and there is a limit to their length in terms of heat resistance. was there. Furthermore, in products where highly water-repellent substances such as silicone oil are applied to the surface of the insulator or the inner wall of the metal shell, when exposed to high-temperature combustion gas, the water repellent substances such as silicone oil may be applied to the surface of the legs of the insulator or the inner wall of the metal shell. The disadvantage of highly water-repellent substances such as silicone oil is that the silicone oil and the like gradually evaporate, so that the effect on carbon adhesion is lost in a short period of time. Therefore, the present invention aims to improve the above-mentioned drawbacks of the conventional spark plug, and by preventing carbon generated due to combustion from adhering to the insulator legs, a decrease in insulation resistance is prevented, and the spark plug becomes reliable. This makes it possible to maintain proper ignition.
（課題を解決するための手段）
そのために、絶縁体脚部の基部側の表面に５×ｌθ〜５
Ｘ ＩＯＭΩ／ ｍ ｍの抵抗値を有する半導体物質に
よる帯体を塗布或は焼付けし、更にこの半導体物質によ
る帯体を撥水性を有するものとし、半導体物質による帯
体を塗布或は焼付けしてなる絶縁体脚部に対向する主体
金具棚巾に、撥水性物質を塗布してなるものである。(Means for solving the problem) For this purpose, the surface of the base side of the insulator leg is
A band made of a semiconductor material having a resistance value of X IOMΩ/mm is coated or baked, and the band made of the semiconductor material is made water repellent, and the band made of the semiconductor material is coated or baked. A water-repellent substance is applied to the shelf width of the metal shell facing the insulator legs.
（作用）
上記構成を具えるので、燃焼によってカーボンが発生し
、急加減速運転の繰返において生ずる生ガスや水等によ
って絶縁体表面に付着しようとしても、絶縁体、特に絶
縁体脚部表面には、５Ｘ １０”〜５Ｘ ＩＯＭΩ／
ｍ ｍの抵抗値を有する半導体物質による帯体が塗布或
は焼付けされているので、たとえ絶縁体表面に水等がカ
ーボンを伴って付着しても、電気的にカーボンの配列が
阻害することができ、又帯体を撥水性を有するものとし
たり、主体金具棚巾に撥水性物質を塗布することによっ
て防水性を高め、絶縁体表面のカーボンによる耐汚損性
を向上すると共に、絶縁抵抗の低下を防ぐことができる
。(Function) With the above structure, even if carbon is generated by combustion and tries to adhere to the surface of the insulator due to raw gas, water, etc. generated during repeated rapid acceleration/deceleration operations, the surface of the insulator, especially the legs of the insulator For 5X 10"~5X IOMΩ/
Since a band made of a semiconductor material having a resistance value of m m is coated or baked, even if water or the like adheres to the surface of the insulator along with carbon, the arrangement of carbon will not be electrically disturbed. In addition, by making the band water repellent or applying a water repellent substance to the shelf width of the main metal fittings, waterproofness can be improved, and stain resistance due to carbon on the surface of the insulator can be improved, as well as a reduction in insulation resistance. can be prevented.
（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、先端
に中心電極（３）を固持する絶縁体（２）と上記中心電
極（３）に対向する位置に外側電極（５）を配置し、内
燃機関に装着する時に使用するネジ部（６）を周設して
なる主体金具（４）から構成されるものであり、この先
端に中心電極（３）を固持する絶縁体（２）の特に脚部
（７）の基部側（１４）の表面に、５×ｌθ〜５ｘｌｄ
’ＭΩ／ ｍ ｍの抵抗値有する半導体物質による帯体
（８）を塗布或は焼付けしてなるものである（第１実施
例）、この半導体物質による帯体（８）は、アルミナ又
はシリカを主成分とし、０．１〜５％の半導体物質（Ｔ
ｉ ０２ 、 Ｎｂ２０５Ｚｒ○２ 、ＢａＴｉＯ３
、ＩｒＯ２等或はＦｅ２Ｏ３等に代表されるフェライト
）を混合し塗布した後、風乾（ｌｈｒ）、更に１００〜
３００°Ｃで焼き付けてなるものである。このため、燃
焼によってカーボンが発生し、燃料や水等によって絶縁
体（２）表面に付着しようとしても、絶縁体（２）、特
に絶縁体脚部（７）の基部側（１４）の表面に５×ｌθ
〜５Ｘ ＩＯＭΩ／ ｍ ｍの抵抗値有する半導体物質
による帯体（８）が設けられているから、水等と共に付
着するカーボンが印加電圧によって電気的に配列するこ
とを防止でき、絶縁体（２）表面のカーボン付着により
発生する絶縁抵抗の低下を防ぐことができる。(Example) This invention will be further explained by the example shown in the drawings.(1)
is a spark plug for an internal combustion engine which is an embodiment of the present invention, and this spark plug for an internal combustion engine (1) includes an insulator (2) that holds a center electrode (3) at its tip, and the center electrode (3). It consists of a metal shell (4) with an outer electrode (5) placed opposite to the metal shell (4) and a threaded part (6) used when mounting it on an internal combustion engine. 5×lθ to 5×ld on the surface of the insulator (2) that holds the electrode (3), especially on the base side (14) of the leg (7).
A band (8) made of a semiconductor material having a resistance value of 'MΩ/mm is coated or baked (first embodiment). This band (8) made of a semiconductor material is coated with alumina or silica. The main component is 0.1 to 5% of semiconductor material (T
i 02 , Nb205Zr○2 , BaTiO3
, IrO2, etc. or ferrites such as Fe2O3) are mixed and applied, air-dried (lhr), and further 100~
It is baked at 300°C. Therefore, even if carbon is generated by combustion and tries to adhere to the surface of the insulator (2) due to fuel, water, etc., it will not adhere to the surface of the insulator (2), especially the base side (14) of the insulator legs (7). 5×lθ
Since the band (8) made of a semiconductor material having a resistance value of ~5X IOMΩ/mm is provided, it is possible to prevent carbon attached together with water etc. from being electrically aligned due to the applied voltage, and the insulator (2) It is possible to prevent a decrease in insulation resistance caused by carbon adhesion on the surface.
なお、この絶縁体（２）の表面に塗布或は焼付けされる
半導体物質による帯体（８）の範囲は、脚部長（１）の
１／３以下であると耐汚損性の効果を維持することがで
き、それ以上長くなるとその効果が生じなくなる（第２
実施例）。Note that the stain-resistant effect is maintained when the area of the band (8) made of a semiconductor material coated or baked on the surface of this insulator (2) is 1/3 or less of the leg length (1). If it is longer than that, the effect will not occur (Second
Example).
また、半導体物質による帯体（８）は第３図に示すよう
に、基部側（１４）の根元（１７）を除いて塗布又は焼
付けによって形成してもよい（第３実施例）。かかる帯
体（８〉の形態は根元（１７）から進展したカーボン路
が帯体（８）によって中断され、帯体（８）から先端に
向かってのカーボン路の移動が一層遅らせるように働く
ため、耐汚損性が第１実施例よりも優れる。Alternatively, the band (8) made of a semiconductor material may be formed by coating or baking, except for the root (17) of the base side (14), as shown in FIG. 3 (third embodiment). The shape of the band (8) is such that the carbon path extending from the root (17) is interrupted by the band (8), which acts to further delay the movement of the carbon path from the band (8) toward the tip. , the stain resistance is superior to that of the first embodiment.
更に、この絶縁体（２）の特に絶縁体脚部（７）の基部
側（１４）の表面に塗布或は焼付けしてなる半導体物質
による帯体（８）を、カーボンブラックを２〜５％添加
するシリコーン又はシリコーンフェス及び窒化ホウ素の
混合物を塗布し、乾燥させ、焼き付ける、又は耐熱性を
向上させる為にベース材としてテフロン等を使用するこ
とによって、この帯体（８）を撥水性を有するものとし
、燃料或は燃焼によって生じる水等が絶縁体（２）の表
面に付着することを防止することができるので、カーボ
ン等の付着の汚損を防止することがより可能となるもの
である（第４実施例）。又、第４図に示すように、絶縁
体（２）の基部側（１４）の表面に塗布或は焼付けして
なる帯体（８）に対向する位置の主体金具（３）の内壁
（１５）に、撥水性物質（９）を塗布することによって
、絶縁体（２）表面に付着しようとする水分を防止し、
カーボンの付着要因を除去しようとするものである（第
５実施例）。Furthermore, a band (8) of a semiconductor material is coated or baked on the surface of the insulator (2), particularly on the base side (14) of the insulator leg (7), and is coated with 2 to 5% carbon black. This strip (8) is made water repellent by applying a mixture of silicone or silicone face and boron nitride to be added, drying and baking, or by using Teflon or the like as a base material to improve heat resistance. Since it is possible to prevent water, etc. generated from fuel or combustion from adhering to the surface of the insulator (2), it is possible to prevent contamination due to adhesion of carbon, etc. ( Fourth Example). In addition, as shown in FIG. 4, the inner wall (15) of the metal shell (3) is located opposite to the band (8) formed by coating or baking the surface of the base side (14) of the insulator (2). ) by applying a water-repellent substance (9) to prevent moisture from adhering to the surface of the insulator (2),
This is an attempt to eliminate the cause of carbon adhesion (fifth embodiment).
その上、絶縁体脚部（７）の基部側（１４）の表面に帯
体（８）を塗布或は焼付けによって形成すると共に、そ
の絶縁体（２）の受部である主体金具（３）の棚部（１
６）の槽中（Ｓ）を軸方向に長めたものであり、これに
よって絶縁体（２）の基部側（１４）へのカーボンの侵
入が少なくなり、耐汚損性を向上することができる（第
６実施例）、また第６実施例において、更に主体金具（
３）の内壁（１５）に第５実施例と同様に撥水性物質（
９）を塗布することを組合せて使用してもよく、この場
合にはより耐汚損性効果が得られるなお、（１１）は、
絶縁体（２）中に穿設された軸孔（１０）にガラスシー
ル材（１２）を挟んで抵抗体（１３）と共に封入される
端子電極である。Furthermore, a band (8) is formed on the surface of the base side (14) of the insulator leg (7) by coating or baking, and the metal shell (3) which is the receiving part of the insulator (2) is formed. shelf (1
The inside of the tank (S) in 6) is lengthened in the axial direction, thereby reducing the intrusion of carbon into the base side (14) of the insulator (2) and improving the stain resistance ( 6th embodiment), and in the 6th embodiment, the metal shell (
Similar to the fifth embodiment, a water-repellent material (
(11) may be used in combination with coating 9), and in this case, a more stain-resistant effect can be obtained.
This is a terminal electrode that is enclosed together with a resistor (13) with a glass sealing material (12) in between, in a shaft hole (10) drilled in an insulator (2).
そこで、表に示すようにこの発明の実施例、比較例及び
従来例である内燃機関用スパークプラグに対して、４サ
イクル、２０００ｃｃの市販車を用い、車速３５に＋＊
／ｂＸ ６０秒、アイドリンクＸ２０秒及び１５に＋ａ
／ｈＸ ４０秒の運転パターンを１サイクルとして繰り
返すブリデリバリ−汚損テストを１０℃の低温下で行っ
たところ、その効果は第６図に示す通り確認された。Therefore, as shown in the table, a 4-cycle, 2000cc commercially available car was used for the spark plugs for internal combustion engines that are examples of the present invention, comparative examples, and conventional examples, and the vehicle speed was increased to +*
/bX 60 seconds, idle link X 20 seconds and +a to 15
/hX A bridle delivery-fouling test was conducted at a low temperature of 10° C. in which a 40-second driving pattern was repeated as one cycle, and the effect was confirmed as shown in FIG.
表
汚損テストの結果、半導体の帯体を設けない従来例のス
パークプラグは３サイクルから急激に絶縁抵抗値が低下
し、６サイクルでＩＭΩまで下がって失火に至るのに対
し、この発明の第１、第３、第４、第５及び第６実施例
のスパークプラグは絶縁抵抗の低下が緩慢であり、良好
な耐汚損性を示す、特に半導体の抵抗値としては５×１
σ〜５×１０ＭΩ／ｌｌ１１がよく、比較例に示すよう
に１００ ＭΩ／龍だとサイクル数を経るに従って徐々
に絶縁抵抗値が低下し、充分に耐汚損性を示すことがで
きない、また、第２実施例の比較品に示すように帯体（
８）の長さ（１）が脚部長（１）の約５０％だと急激に
絶縁抵抗値が低下して耐汚損性に効果がなく、ｔは１／
３．１以下が適当であり、また帯体（８）は第３実施例
に示すように、基部側（１４）で根元（１７）を除いて
前記（１）の範囲においてリング状に設けた方が耐汚損
性に有効である、更に半導体は第４実施例のように帯体
の上に撥水性を備えたものがより効果的であり、また第
５実施例のように主体金具（３）の内壁に同じく撥水性
を備えたもの、及び第６実施例のように、主体金具（３
）の槽中（Ｓ）を長くすることが耐汚損性に更に効果的
である。特に第６実施例のものは棚部の加工寸法を変え
るだけのため製作が容易で有用である。As a result of the surface contamination test, the insulation resistance value of a conventional spark plug without a semiconductor strip suddenly decreased from the 3rd cycle, and fell to IMΩ at the 6th cycle, leading to a misfire. The spark plugs of Examples 3, 4, 5, and 6 have a slow decrease in insulation resistance and exhibit good stain resistance, especially when the semiconductor resistance value is 5×1.
σ ~ 5 × 10 MΩ/ll11 is good, but as shown in the comparative example, if it is 100 MΩ/11, the insulation resistance value gradually decreases as the number of cycles passes, and it is not possible to show sufficient stain resistance. As shown in the comparative product of Example 2, the band (
8) If the length (1) is about 50% of the leg length (1), the insulation resistance value will drop rapidly and the stain resistance will not be effective, and t will be 1/
3.1 or less is suitable, and as shown in the third embodiment, the band (8) is provided in a ring shape in the range of (1) above on the base side (14) except for the root (17). Furthermore, it is more effective for semiconductors to have water repellency on the band as in the fourth embodiment, and it is more effective for semiconductors to have water repellency on the band as in the fifth embodiment. ) has water-repellent inner walls, and as in the sixth embodiment, the metal shell (3
) It is more effective for stain resistance to lengthen the length of the tank (S). In particular, the sixth embodiment is easy to manufacture and useful because only the processing dimensions of the shelf portion are changed.
（発明の効果）
以上のとおり、絶縁体の脚部に半導体物質を塗布、焼付
けすることによって、絶縁体表面に付着するカーボンの
電気的配列を阻害し、更に撥水性物質を絶縁体表面に配
室することによって、上記カーボンの電気的配列の原因
である水分等を排除することができるので、絶縁抵抗値
の減少を防止し、プレイグニツシヨンの原因となるカー
ボン汚損を除去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 coating and baking a semiconductor material on the legs of the insulator, the electrical arrangement of carbon adhering to the insulator surface is inhibited, and a water-repellent material is further applied to the insulator surface. This is an excellent method for preventing a decrease in insulation resistance and removing carbon contamination that causes pre-ignition. It has the following effects.
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であり、第２図は、この発明の第１
実施例の要部拡大断面図、第３図は、この発明の第３実
施例の要部拡大断面図、第４図は、この発明の第５実施
例の要部拡大断面図、第５図は、この発明の第６実施例
の要部拡大断面図、第６図は汚損テスト結果を示すグラ
フである。
１・・・内燃機関用スパー２１ラグ ２・・・絶縁体３
・・・中心電極 ４・・・主体金具 ５・・・外側電極
６・・・ネジ部 ７・・・脚部 ８・・・帯体 ９・・
・撥水性物質 １０・・・軸孔 １１・・・端子型８ｉ
１２・・・ガラスシール材 １３・・・抵抗体 １４
・・・基部側１５・・・主体金具棚巾 １６・・・棚部
１７・・・根元第１図
特許出願人 代理人 弁理士 藤 木 三 幸第２図
第３
図
第４図
第５図FIG. 1 is a partial sectional view of a spark plug for an internal combustion engine which is an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view of the main parts of the third embodiment of the present invention; FIG. 4 is an enlarged cross-sectional view of the main parts of the fifth embodiment of the invention; FIG. 6 is an enlarged cross-sectional view of the main part of the sixth embodiment of the present invention, and FIG. 6 is a graph showing the staining test results. 1... Internal combustion engine spar 21 lug 2... Insulator 3
... Center electrode 4 ... Metal shell 5 ... Outer electrode 6 ... Thread section 7 ... Leg section 8 ... Band 9 ...
・Water repellent material 10...Shaft hole 11...Terminal type 8i
12...Glass sealing material 13...Resistor 14
... Base side 15 ... Main body metal shelf width 16 ... Shelf section 17 ... Base Fig. 1 Patent applicant Agent Patent attorney Miyuki Fujiki Fig. 2 Fig. 3 Fig. 4 Fig. 5
Claims (5)
×１０＾４ＭΩ／ｍｍの抵抗値を有する半導体物質によ
る帯体を塗布或は焼付けしてなる内燃機関用スパークプ
ラグ。(1), 5 x 10^2~5 on the base side surface of the insulator leg
A spark plug for an internal combustion engine, which is made by coating or baking a band made of a semiconductor material having a resistance value of ×10^4 MΩ/mm.
る絶縁体脚部の範囲を、脚部長の１／３以下としてなる
請求項（１）、記載の内燃機関用スパークプラグ。(2) The spark plug for an internal combustion engine according to claim (1), wherein the range of the insulator leg formed by applying or baking a band made of a semiconductor material is 1/3 or less of the leg length.
体物質による帯体を撥水性を有するものとしてなる請求
項（１）、又は（２）、記載の内燃機関用スパークプラ
グ。(3) The spark plug for an internal combustion engine according to claim (1) or (2), wherein the band made of a semiconductor material coated or baked on the surface of the insulator leg is water repellent.
る絶縁体脚部に対向する主体金具内壁に、撥水性物質を
塗布してなる請求項（１）、（２）、又は（３）、記載
の内燃機関用スパークプラグ。(4) Claim (1), (2), or (3) wherein a water-repellent substance is applied to the inner wall of the metal shell facing the insulator leg formed by applying or baking a band made of a semiconductor material. ), spark plugs for internal combustion engines.
してなる請求項（１）、（２）、（３）、又は（４）、
記載の内燃機関用スパークプラグ。(5) Claim (1), (2), (3), or (4), wherein the shelf width of the metal shell serving as the insulator receiving portion is lengthened in the axial direction;
Spark plug for the internal combustion engine described.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1073851A JPH0650663B2 (en) | 1989-03-28 | 1989-03-28 | Spark plug for internal combustion engine |
| CA002013129A CA2013129C (en) | 1989-03-28 | 1990-03-27 | Spark plug for internal combustion engine |
| DE69006066T DE69006066T2 (en) | 1989-03-28 | 1990-03-27 | Spark plug for an internal combustion engine. |
| EP90105794A EP0390065B1 (en) | 1989-03-28 | 1990-03-27 | Spark plug for internal combustion engine |
| BR9001601A BR9001601A (en) | 1989-03-28 | 1990-03-28 | IGNITION CANDLE FOR INTERNAL COMBUSTION ENGINES |
| US07/742,533 US5109178A (en) | 1989-03-28 | 1991-08-08 | Spark plug for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1073851A JPH0650663B2 (en) | 1989-03-28 | 1989-03-28 | Spark plug for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02253587A true JPH02253587A (en) | 1990-10-12 |
| JPH0650663B2 JPH0650663B2 (en) | 1994-06-29 |
Family
ID=13530066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1073851A Expired - Fee Related JPH0650663B2 (en) | 1989-03-28 | 1989-03-28 | Spark plug for internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0650663B2 (en) |
| BR (1) | BR9001601A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017530519A (en) * | 2014-09-10 | 2017-10-12 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Ceramic spark plug insulators, use of glazes in spark plugs and spark plug insulators |
-
1989
- 1989-03-28 JP JP1073851A patent/JPH0650663B2/en not_active Expired - Fee Related
-
1990
- 1990-03-28 BR BR9001601A patent/BR9001601A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017530519A (en) * | 2014-09-10 | 2017-10-12 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Ceramic spark plug insulators, use of glazes in spark plugs and spark plug insulators |
| US10038309B2 (en) | 2014-09-10 | 2018-07-31 | Robert Bosch Gmbh | Ceramic spark plug insulator, spark plug, and use of a glaze on a spark plug insulator |
Also Published As
| Publication number | Publication date |
|---|---|
| BR9001601A (en) | 1991-05-07 |
| JPH0650663B2 (en) | 1994-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |