METAL GASKET FOR CYLINDER HEAD

摘要

A metal gasket for cylinder head 1 of plate lamination type, comprises two base plates 2 formed of metal plates, and each of which includes cylinder holes 2a, circumferential beads 2b formed around the peripheries of individual cylinder holes, cooling water holes 2c formed outside the peripheries of the circumferential beads, and an outer bead 2d formed and positioned so as to entirely enclose the circumferential beads and the cooling water holes, wherein the circumferential beads 2b of the two base plates 2 are aligned in the direction of thickness of the metal gasket. The metal gasket is characterized by inserting claw-like protrusions 3a provided for one of an outer step adjustment plate 3 formed of a metal plate and extends from the position of the cooling water jacket to the positions of the outer edges of the base plates, and an inner step adjustment plate 4 formed of a metal plate that is thicker than the outer step adjustment plate and extends from locations inside the circumferential beads 2b of the base plates 2 to the position of the cooling water jacket, into engagement holes 4a in the other of the inner step adjustment plate and the outer step adjustment plate; and folding over the portions of the claw-like protrusions 3a that project through the engagement holes 4a to enable the outer step adjustment plate 3 and the inner step adjustment plate 4 to be coupled together, and to be arranged between the two base plates 2. With this metal gasket, even a small step difference can be arranged in order to appropriately balance a contact pressure applied to the circumferential beads and the outer bead.