Spark plug

专利名称：Spark plug发明人：Mai Nakamura申请号：US14359175申请日：20121206公开号：US075809B2公开日：20150310

专利附图：

摘要：An ignition plug having a ceramic insulator with an axial bore, a metallic shellprovided around the ceramic insulator, and a terminal electrode having a leg portioninserted into a rear end portion of the axial bore and a head portion projecting from therear end of the ceramic insulator, wherein the length L of a portion of the ceramic

insulator projecting from the rear end of the metallic shell is not less than 28 mm but notgreater than 34 mm. The thickness t of the thinnest portion of the ceramic insulator is 1.0mm or greater within a region which extends 5.5 mm from the rear end of the ceramicinsulator toward the forward end side with respect to the direction of the axis.

申请人：NGK Spark Plug Co., Ltd.

地址：Nagoya-shi, Aichi JP

国籍：JP

代理机构：Kusner & Jaffe

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