公开(公告)号：US20140159563A1

公开(公告)日：2014-06-12

申请号：US14101386

申请日：2013-12-10

Applicant: Denso Corporation

Inventor： Masamichi SHIBATA ,  Takayuki INOHARA ,  Shinichi Okabe ,  Takanobu AOCHI ,  Kaori DOI

IPC: H01T13/02

CPC classification number: H01T13/02 ,  H01T13/32

Abstract: A spark plug for internal combustion engines is provided, where the spark plug includes a cylindrical housing, a cylindrical insulation porcelain part, a center electrode, and a ground electrode. The insulation porcelain is housed in the housing and the center electrode is held inside the insulation porcelain. The ground electrode protrudes from a top end portion of the housing. A spark discharge gap is left between the ground and center electrodes. Further, first to third projections are formed on the top end portion. The first projection is opposed to the ground electrode with the center electrode therebetween. The second projection is closer to the ground electrode than to the first projection. The third projection is closer to the first projection than to the ground electrode.

Abstract translation: 提供了一种用于内燃机的火花塞，其中火花塞包括圆柱形壳体，圆柱形绝缘瓷部件，中心电极和接地电极。 绝缘瓷被容纳在壳体中，中心电极保持在绝缘瓷内。 接地电极从壳体的顶端部突出。 火花放电间隙留在接地和中心电极之间。 此外，在顶端部形成有第一至第三突起。 第一突起与其间具有中心电极的接地电极相对。 第二突起比第一突起更靠近接地电极。 第三投影比接地电极更靠近第一投影。