Patent ID: 8981634
Filing Date: 2015-03-17
Classification: H01T

Abstract:
1. A spark plug, comprising: a metallic shell having an internal surface with a seat portion; an insulator having an external surface with a shoulder portion, a supported portion, and a tapered core nose and being at least partially located within the metallic shell, the supported portion extends between the shoulder portion and the tapered core nose and is parallel to a longitudinal axis LA of the spark plug; a gasket having upper and lower axial ends and being at least partially located between the metallic shell and the insulator; a center electrode being at least partially located within the insulator; and a ground electrode being attached to the metallic shell; wherein the gasket upper axial end has a mating surface that contacts the insulator shoulder portion and the gasket lower axial end has a mating surface that contacts the shell seat portion, the gasket is compressed in the axial direction between the insulator shoulder portion and the shell seat portion so that the gasket supports the insulator supported portion against radial stress (RS) and the insulator and metallic shell are sealed together.