公开(公告)号：US4695758A

公开(公告)日：1987-09-22

申请号：US758415

申请日：1985-07-24

申请人： Minoru Nishida ,  Tadashi Hattori ,  Kunimasa Yoshimura ,  Tetsuzo Muraki

发明人： Minoru Nishida ,  Tadashi Hattori ,  Kunimasa Yoshimura ,  Tetsuzo Muraki

IPC分类号： H01T13/20 ,  H01T13/46

CPC分类号： H01T13/20 ,  H01T13/467

摘要： A small-sized spark plug for internal combustion engines is disclosed which is composed of a center electrode having a shaft portion surrounded by an insulator layer and a terminal end portion adapted to act as a spark generation portion; and an earthed electrode having a terminal end portion which is spaced apart from and is opposite to the terminal end portion of the center electrode so that a spark gap is defined along a surface of the insulator layer. The shortest distance .delta. (mm) between each end portion of the two electrodes and the surface of the insulation layer and the distance l between the forward end portions of the two electrodes have the following relationship:.delta..gtoreq.0.25 l, and 0.8 mm.ltoreq.l.ltoreq.2.0 mm.A recessed portion may be provided on the surface of the insulation layer.

摘要翻译： 公开了一种用于内燃机的小型火花塞，其由具有被绝缘体层包围的轴部分和适于用作火花发生部分的终端部分的中心电极组成; 以及接地电极，其具有与中心电极的末端部隔开并与之相反的末端部，使得沿着绝缘体层的表面限定火花隙。 两个电极的每个端部和绝缘层的表面之间的最短距离Δ（mm）和两个电极的前端部分之间的距离l具有以下关系：Δ> = 0.25l和0.8mm