Patent ID: 9343875
Filing Date: 2016-05-17
CPC Classification: F02P,H01T

Claim Text:
1. A spark plug for an internal combustion engine, comprising a cylindrical housing, a cylindrical insulation porcelain held inside the housing, a center electrode held inside the insulation porcelain, with a tip portion thereof being projected, and a ground electrode connected to the housing and having an opposing portion opposed to the center electrode in an axial direction of the plug to form a spark discharge gap between the center electrode and the ground electrode, wherein both of the tip portion of the center electrode and the opposing portion of the ground electrode have respective projection portions projected toward the spark discharge gap; at least one of the projection portions has an opposing face confronting the spark discharge gap and inclined with respect to a plane perpendicular to the axial direction of the plug; the spark discharge gap is configured to be gradually enlarged, in one direction perpendicular to the axial direction of the spark plug, from a narrow gap on one end side in the direction, the narrow gap having a gap length smaller than on the other end side, toward a wide gap on the other end side, the wide gap having a gap length larger than on the one end side; at least one of the projection portions: the wide gap is formed in the second region and the narrow gap is formed in the minimum curvature radius portion of the first region.