公开(公告)号：EP2073328A2

公开(公告)日：2009-06-24

申请号：EP08022176.5

申请日：2008-12-19

申请人： NGK SPARK PLUG CO., LTD

发明人： Kameda, Hiroyuki ,  Nakayama, Katsutoshi ,  Nagasawa, Satoshi ,  Yoshida, Kazumasa

IPC分类号： H01T13/39

CPC分类号： H01T13/39 ,  H01T13/16 ,  H01T13/32

摘要： A spark plug includes an outer electrode including an outer electrode tip of which a distal end surface is spaced from an outer peripheral surface of a leading end portion of a center electrode to define a spark discharge gap. A protruding insulator portion of a cylindrical insulator protrudes at least 1.0 mm from a leading end surface of a cylindrical metal shell. A protruding center electrode portion of the center electrode protrudes at least 3.5 mm from the leading end surface of the cylindrical metal shell. A relationship (θ1+θ2)/2 ≥ 75 degrees is satisfied where the angle θ1 is defined as a central angle (degrees) of a first circular sector having a point B1 as a center thereof, and the angle θ2 is an average value (degrees) of the central angles of two second circular sectors having the point B1 as a center thereof.

摘要翻译： 火花塞包括外部电极，该外部电极包括外部电极尖端，远端表面与中心电极的前端部分的外周表面间隔开以限定火花放电间隙。 圆筒形绝缘体的突出绝缘体部分从圆柱形金属壳体的前端表面突出至少1.0mm。 中心电极的突出中心电极部分从圆柱形金属壳的前端表面突出至少3.5mm。 在将角度θ1定义为以点B1为中心的第一扇形的中心角（度）的情况下，满足关系（θ1+θ2）/2≥75度，并且角度θ2是平均值 度）以点B1为中心的两个第二圆形扇形的中心角。

公开(公告)号：EP1775808A1

公开(公告)日：2007-04-18

申请号：EP06021356.8

申请日：2006-10-11

申请人： NGK SPARK PLUG CO., LTD

发明人： Torii, Kazuyoshi ,  Yoshida, Kazumasa ,  Matsutani, Wataru

IPC分类号： H01T13/32 ,  H01T21/02

CPC分类号： H01T21/02 ,  H01T13/32

摘要： A spark plug comprising: a center electrode extending in a direction of an axis of said spark plug; a cylindrical insulator which has a shaft hole, and which holds said center electrode in said shaft hole in a state where a tip end of said center electrode is projected from a tip end face of said insulator; a metal shell which holds said insulator; and a ground electrode in which one end is joined to a tip end face of said metal shell, and which extends from said one end toward another end, wherein said ground electrode has an inner side face which faces said center electrode, and an outer side face which is a back face with respect to said inner side face, said outer side face is formed as an arcuately curved face when viewed from a side of said another end in an extending direction of said ground electrode, and a columnar noble metal tip is joined to said inner side face.

摘要翻译： 一种火花塞，包括：沿所述火花塞的轴线方向延伸的中心电极; 圆柱形绝缘体，其具有轴孔，并且在所述中心电极的前端从所述绝缘体的前端面突出的状态下将所述中心电极保持在所述轴孔中; 保持所述绝缘体的金属外壳; 以及接地电极，其一端接合到所述金属壳的前端面，并且从所述一端向另一端延伸，其中所述接地电极具有面向所述中心电极的内侧面，外侧 面是相对于所述内侧面的背面，当从所述另一端侧沿所述接地电极的延伸方向观察时，所述外侧面形成为弧形弯曲面，柱状贵金属电极头为 连接到所述内侧面。