Spark plug for voltage resistance and suppression of side sparking and oxidation

A spark plug includes an insulator and a center electrode. The insulator includes: a first cylindrical portion; a truncated cone-shaped portion whose outer diameter reduces toward a front end side; and a second cylindrical portion formed at a front end side of the truncated cone-shaped portion. A di...

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Bibliographische Detailangaben
Hauptverfasser:	Fukuzawa Reimon, Kuki Hiroaki
Format:	Patent
Sprache:	eng
Schlagworte:	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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Beschreibung
Zusammenfassung:	A spark plug includes an insulator and a center electrode. The insulator includes: a first cylindrical portion; a truncated cone-shaped portion whose outer diameter reduces toward a front end side; and a second cylindrical portion formed at a front end side of the truncated cone-shaped portion. A diameter C of the center electrode is not larger than 2.2 mm. A total I of a volume of the truncated cone-shaped portion and a volume of the second cylindrical portion, a volume E of the center electrode from a position at a rear end of the truncated cone-shaped portion to a position at a front end of the second cylindrical portion, and the diameter C satisfy I/E≧4.2333C2−19.79C+24.869.