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1. 发明申请

US20170077681A1 SPARK PLUG 审中-公开
标题翻译： SPARK插头
公开(公告)号：US20170077681A1
公开(公告)日：2017-03-16
申请号：US15264971
申请日：2016-09-14
申请人： NGK SPARK PLUG CO., LTD.
发明人： Yohei KOZAKAI , Satoshi NAGASAWA , Akira SUZUKI
IPC分类号： H01T13/20 , H01T13/36 , H01T13/12
CPC分类号： H01T13/20 , H01T13/12 , H01T13/36 , H01T13/39
摘要： A spark plug includes an insulator having an axial hole formed therethrough in the direction of an axis of the spark plug, a center electrode disposed in a front side of the axial hole and a metal shell disposed around an outer circumference of the insulator and having a collar-shaped tool engagement portion and a crimp portion located on a rear side of the tool engagement portion and reduced in diameter toward the rear, wherein the crimp portion of the metal shell is made of a carbon steel material having a grain size number equal to or greater than No. 11 as measured according to JIS G 0551.
摘要翻译：火花塞包括绝缘体，该绝缘体具有沿着火花塞的轴线方向穿过的轴向孔，设置在轴向孔的前侧的中心电极和设置在绝缘体外周周围的金属壳，环形工具接合部分和位于工具接合部分的后侧上并且朝向后方减小的压接部分，其中金属壳体的卷曲部分由具有等于或大于根据JIS G 0551测量的11号。

2. 发明申请

US20140368105A1 SPARK PLUG 审中-公开
标题翻译： SPARK插头
公开(公告)号：US20140368105A1
公开(公告)日：2014-12-18
申请号：US14469005
申请日：2014-08-26
申请人： NGK Spark Plug Co., Ltd.
发明人： Satoshi NAGASAWA , Akira SUZUKI
IPC分类号： H01T13/16 , H01T13/32
CPC分类号： H01T13/16 , H01T13/32
摘要： A spark plug has a metal shell and a ground electrode joined at a base end portion thereof to the metal shell and includes a surface layer and a core higher in thermal conductivity than the surface layer. The surface layer has a thickness of 0.2 to 0.4 mm at a specific position that is located 1 mm from the base end portion. The spark plug satisfies the following condition: W1≧W2×1.55−(W3+0.25) where W1 (mm) is a width of the metal shell at a weld region of the metal shell joined with the base end portion in a specific direction that extends perpendicular to the axis direction through a center line of the ground electrode; W2 (mm) is a thickness of the ground electrode at the specific position in the specific direction; and W3 (mm) is a thickness of the surface layer at the specific position in the specific direction.
摘要翻译：火花塞具有金属壳和接地电极，其基端部连接到金属壳，并且包括具有比表面层更高的导热性的表面层和芯。表面层在距离基端部1mm位置的特定位置具有0.2〜0.4mm的厚度。火花塞满足以下条件：W1≥W2×1.55-（W3 + 0.25）其中，W1（mm）是金属壳的与基端部的特定方向的焊接部的焊接部的宽度，通过接地电极的中心线垂直于轴线方向延伸; W2（mm）是特定方向的特定位置处的接地电极的厚度; W3（mm）是特定方向的特定位置的表面层的厚度。

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