公开(公告)号：US06208066B1

公开(公告)日：2001-03-27

申请号：US09035035

申请日：1998-03-05

申请人： Akio Kokubu ,  Kazumasa Yoshida ,  Yoshihiro Matsubara ,  Makoto Yamaguchi

发明人： Akio Kokubu ,  Kazumasa Yoshida ,  Yoshihiro Matsubara ,  Makoto Yamaguchi

IPC分类号： H01T1352

CPC分类号： H01T13/52 ,  F02B2275/18

摘要： In a semi-creeping discharge type spark plug, a cylindrical metal shell and an insulator are provided, the latter of which has an axial bore and placed within the metal shell so that a front end of the insulator extends beyond the metal shell. A center electrode is placed within the axial bore of the insulator so that a front end surface edge of the center electrode retracts by 0.1˜0.6 mm behind from a front end surface of the insulator. A ground electrode, one end of which is connected to a front end of the metal shell, and the other end of which is bent to oppose an outer surface of the insulator so as to form an air-gap therebetween while permitting creeping spark discharges running along said front end surface of said insulator. A foward edge portion of a front end surface of the ground electrode extends by 0.0˜1.0 mm forward from the front end surface of the insulator.

摘要翻译： 在半爬电式火花塞中，设置有圆柱形金属壳和绝缘体，后者具有轴向孔并且放置在金属壳内，使得绝缘体的前端延伸超出金属壳。 中心电极放置在绝缘体的轴向孔内，使得中心电极的前端表面边缘从绝缘体的前端表面后退0.1〜0.6mm。 接地电极，其一端连接到金属壳的前端，另一端弯曲成与绝缘体的外表面相对，以在其间形成气隙，同时允许蠕变火花放电运行 沿着所述绝缘体的所述前端表面。 接地电极的前端面的前端部从绝缘体的前端面向前方延伸0.0〜1.0mm。