SPARK PLUG

To improve endurance of ground electrode.SOLUTION: A spark plug includes a main body metal fitting having a through hole extending in the direction of axis line, an insulator fixed to the inner peripheral side of the main body metal fitting, a center electrode including a portion placed at the tip o...

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Bibliographic Details
Main Authors ITO KAZUKI, SHIBATA TSUTOMU, SUMOYAMA DAISUKE
Format Patent
LanguageEnglish
Japanese
Published 07.02.2019
Subjects
BASIC ELECTRIC ELEMENTS
BLASTING
COMBUSTION ENGINES
CORONA DEVICES
ELECTRICITY
GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES
LIGHTING
MECHANICAL ENGINEERING
OVERVOLTAGE ARRESTERS USING SPARK GAPS
SPARK GAPS
SPARKING PLUGS
TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
WEAPONS
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Summary:To improve endurance of ground electrode.SOLUTION: A spark plug includes a main body metal fitting having a through hole extending in the direction of axis line, an insulator fixed to the inner peripheral side of the main body metal fitting, a center electrode including a portion placed at the tip of the insulator and forming a first discharge surface, and a rod-like ground electrode having a proximal end joined to the annular apical surface of the main body metal fitting, and forming a discharge gap between the first discharge surface of the center electrode at the tip. The contour of the ground electrode near the proximal end perpendicular to the axis line includes a first side representative of the outer surface on the inner peripheral side, a second side for connection with one end of the first side, and a third side for connection with the other end of the first side. The length of the second side is different from the length of the third side. The first side is inclining obliquely to a straight line connecting the median point of the first side and the axis line. The area of the profile is 1.2 mmor more.SELECTED DRAWING: Figure 1 【課題】接地電極の耐久性を向上する。【解決手段】点火プラグは、軸線の方向に延びる貫通孔を有する主体金具と、主体金具の内周側に固定された絶縁体と、絶縁体の先端部に配置される部分を含むとともに第１放電面を形成する中心電極と、基端が主体金具の環状の先端面に接合されるとともに、先端部において中心電極の第１放電面との間で放電ギャップを形成する第２放電面を形成する棒状の接地電極と、を備える。接地電極の基端近傍の断面であって、軸線に垂直な断面の輪郭は、内周側の外面を表す第１辺と、第１辺の一端に接続される第２辺と、第１辺の他端に接続される第３辺と、を含む。第２辺の長さは、第３辺の長さとは異なっている。第１辺は、第１辺の中点と軸線とを結ぶ直線に対して斜めに傾斜している。断面の面積は、１．２ｍｍ２以上である。【選択図】 図１
Bibliography:Application Number: JP20170138672