Spark plug having a metal fitting portion for holding an insulator at a portion opposite a tip end

Provided is a spark plug that includes a center electrode extending in an axial direction, a cylindrical insulator that holds the center electrode, and a cylindrical main metal fitting, which has a ground electrode at a tip portion thereof. The cylindrical main metal fitting includes a tool engageme...

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Bibliographic Details
Main Authors Hotta, Nobuyuki, Kodera, Eiji, Ohbayashi, Kazushige, Sugimoto, Noriyasu
Format Patent
LanguageEnglish
Published 07.08.2012
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Summary:Provided is a spark plug that includes a center electrode extending in an axial direction, a cylindrical insulator that holds the center electrode, and a cylindrical main metal fitting, which has a ground electrode at a tip portion thereof. The cylindrical main metal fitting includes a tool engagement portion for mounting the spark plug to an engine and a metal fitting-side fitting portion provided at a rear side of the main metal fitting opposite from the tip portion. The metal fitting-side fitting portion holds the insulator in a tightly fitted state in a radial direction.