Patent ID: 8552629
Filing Date: 2013-10-08
Classification: H01T

Abstract:
1. A spark plug for an internal combustion engine comprising: a hollow cylindrical housing which has an open end; a cylindrical porcelain insulator retained in the cylindrical housing; a center electrode having a given length which is retained in the porcelain insulator with a tip thereof exposed outside an end of the porcelain insulator; a ground electrode which is joined to the cylindrical housing so as to form a spark gap between itself and the tip of the center electrode; and a tip protrusion which extends from the open end of the cylindrical housing, the tip protrusion being shaped to have a radial width that is a width extending in a radial direction of the cylindrical housing and a circumferential width that is a width extending in a circumferential direction of the cylindrical housing, the radial width being greater than the circumferential width.