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2. 发明公开

EP2538506A4 SPARK PLUG 有权转让
标题翻译： ZÜNDKERZE
公开(公告)号：EP2538506A4
公开(公告)日：2013-12-04
申请号：EP10846079
申请日：2010-11-26
申请人： NGK SPARK PLUG CO
发明人： KASUYA YUJI , BAN KENJI
IPC分类号： H01T13/20 , F02P13/00 , H01T13/39
CPC分类号： H01T13/39 , F02P13/00
摘要： Breakage of a center electrode, etc., is more reliably prevented, and the effect of improving ignition performance and durability associated with provision of a noble metal tip is sufficiently exhibited. A spark plug 1 includes a ceramic insulator 2, a center electrode 5, a metallic shell 3, and a ground electrode 27. The center electrode 5 has a shoulder portion 51 at a forward end portion thereof. The shoulder portion 51 tapers forward with respect to the direction of an axis CL1. A noble metal tip 31 is joined to the forward end portion of the center electrode 5 through a fusion zone 35 and forms a spark discharge gap 33 in cooperation with the ground electrode 27. The shortest distance between the fusion zone 35 and a distal end surface of the noble metal tip 31 is 0.8 mm to 1.2 mm inclusive as measured on an outer side surface of the noble metal tip 31 along the axis CL1. The outside diameter of the fusion zone 35 as measured at a distal end of the fusion zone 35 is smaller than that as measured at a proximal end of the fusion zone 35. An acute angle ¸1 formed by a straight line L1 and a straight line L2 satisfies the relational expression ¸1 ‰¤ 72°.
摘要翻译：更可靠地防止了中心电极等的破损，充分发挥了与提供贵金属电极头相关的提高点火性能和耐久性的效果。火花塞1包括陶瓷绝缘体2，中心电极5，金属壳3和接地电极27.中心电极5在其前端部具有肩部51。肩部51相对于轴线CL1的方向向前倾斜。贵金属电极头31通过熔合区35连接到中心电极5的前端部分，并且与接地电极27配合形成火花放电间隙33.熔合区35与末端表面之间的最短距离在贵金属电极头31的沿着轴线CL1的外侧表面上测量时，贵金属电极头31的厚度为0.8mm至1.2mm。在熔合区35的远端处测量的熔合区35的外径小于在熔合区35的近端处测量的熔合区35的外径。由直线L1和直线L1形成的锐角¸1 L2满足关系式¸1‰¤72°。

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