SPARK PLUG

Both reduction of an electrostatic capacity and securing of impact resistance of a center electrode are achieved. A spark plug includes a metal shell, a ceramic insulator, a resistor, a center electrode, and a seal body. The metal shell is an almost cylindrical member having a ground electrode on a...

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Bibliographische Detailangaben
Hauptverfasser:	KURONO, Hirokazu, KITA, Junpei, UEGAKI, Hironori
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS CORONA DEVICES ELECTRICITY GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES OVERVOLTAGE ARRESTERS USING SPARK GAPS SPARK GAPS SPARKING PLUGS
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Beschreibung
Zusammenfassung:	Both reduction of an electrostatic capacity and securing of impact resistance of a center electrode are achieved. A spark plug includes a metal shell, a ceramic insulator, a resistor, a center electrode, and a seal body. The metal shell is an almost cylindrical member having a ground electrode on a front end side thereof. The ceramic insulator is a cylindrical member that is held in the metal shell and that has therein an axial hole having a small-diameter portion, and a large-diameter portion larger in diameter than the small-diameter portion and connected to a rear end of the small-diameter portion via a stepped portion. The resistor is arranged in the large-diameter portion. The center electrode has: a flange portion projecting in a radial direction in the large-diameter portion to contact with the stepped portion; and a leg portion arranged in the small-diameter portion so as to extend from the flange portion toward the front end side. The seal body is arranged in the large-diameter portion and electrically connects between the center electrode and the resistor. The seal body includes an insulating seal body that comes into contact with the ceramic insulator, and a conductive seal body.