Patent ID: 7204491
Filing Date: 2007-04-17
Classification: F16J

Abstract:
1. A single-layer or multiple-layer metal gasket composed of a single or a plurality of gasket component sheet(s) having an opening to face a combustion chamber of an engine, at least one of the gasket component sheets being provided with a bead surrounding the opening, wherein an inner circumference side stopper with a wave-shaped cross section lower than the height of the bead is formed along the bead at least either in a portion between the bead and the opening of the gasket component sheet formed with the bead or in a portion of another gasket component sheet opposing the same, such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.