Metal gasket having fluid hole sealing device with different spring constant

摘要

The metal gasket of the invention is installed in an internal combustion engine. The engine includes at least one cylinder bore, a plurality of bolt holes and at least one fluid hole. The gasket is basically formed of a metal plate and includes holes corresponding to the holes of the engine. The gasket includes a bead for sealing around the fluid hole, to which different tightening pressure is proportionally applied when the gasket is tightened. The bead includes at least one first portion where high tightening pressure is applied, and at least one second portion where moderate tightening pressure is applied. The second portion has spring constant less than that of the first portion. When the gasket is tightened, the bead is compressed according to the tightening pressure applied thereto to thereby properly seal around the fluid hole.