发明名称 Spark plug of internal combustion engine having glaze layers on the spark plug
摘要 There is provided a spark plug of an internal combustion engine, including a cylindrical metal shell, an insulator retained in the metal shell and having a through hole in an axial direction of the spark plug and a center electrode fitted in the through hole of the insulator. The insulator includes a rear body portion, a middle body portion and a large-diameter portion located between and protruded radially outwardly from the rear and middle body portions to define a rear shoulder section connected to the rear body portion and a front shoulder section connected to the middle body portion. For strength improvements, the insulator has a first glaze layer extending over the rear body portion and the rear shoulder section of the large-diameter portion and a second glaze layer extending over at least part of the middle body portion from some point on the front shoulder section of the large-diameter portion.
申请公布号 US7906893(B2) 申请公布日期 2011.03.15
申请号 US20080056135 申请日期 2008.03.26
申请人 NGK SPARK PLUG CO., LTD. 发明人 MORIBE MAI;SUZUKI AKIRA;HONDA TOSHITAKA
分类号 H01T13/02 主分类号 H01T13/02
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