公开(公告)号：US20140265816A1

公开(公告)日：2014-09-18

申请号：US14355817

申请日：2012-10-31

Applicant: DENSO CORPORATION

Inventor： Ken Hanashi ,  Nobuo Abe

IPC: H01T13/20

CPC classification number: H01T13/20 ,  F02P13/00 ,  F02P15/005 ,  H01T13/32

Abstract: A spark plug for an internal combustion engine is provided, which includes a housing, an insulation porcelain, a center electrode and a ground electrode. At least one of a tip portion of the center electrode and an opposing portion of the ground electrode is provided with a projection portion. At least one of the projection portions has a cross section perpendicular to the axial direction of the plug, the cross section having a minimum curvature radius portion and being in a specific shape that satisfies a predetermined requirement. The requirement is that, when a first straight line, a first line segment and a second straight line are provided, and when the cross section is divided into a first region and a second region by the second straight line, the second region has an area larger than the area of the first region.

Abstract translation: 提供了一种用于内燃机的火花塞，其包括外壳，绝缘瓷，中心电极和接地电极。 中心电极的前端部分和接地电极的相对部分中的至少一个设置有突出部分。 突起部中的至少一个具有与插头的轴向垂直的截面，该截面具有最小曲率半径部分，并且具有满足预定要求的特定形状。 要求的是，当设置第一直线，第一线段和第二直线时，并且当横截面被第二直线分成第一区域和第二区域时，第二区域具有区域 大于第一区域的面积。