METAL GASKET FOR CYLINDER HEAD

摘要

A metal gasket for a cylinder head is constituted of two base plates (2) each constructed from a metal plate and layered over each other, an auxiliary plate (3) constructed from a metal plate and interposed between the base plates (2), and hard metal-plated layers (5). The base plates (2) each have cylinder holes (2a), annular beads (2b), coolant holes (2c), and an outer peripheral bead (2d). The cylinder holes (2a) are formed so as to correspond with the bore of each cylinder of a cylinder block of an internal combustion engine. The annular beads (3b) have an angled cross-sectional shape and formed around each of the cylinder holes. The coolant holes (2c) are formed at outer peripheral portions of each of the annular beads so as to correspond with a coolant jacket of the cylinder block and with a coolant hole of the cylinder head. The outer peripheral bead (2d) has a cross-sectional shape sloping on one side and is positioned so as to totally surround the number beads and the coolant holes. The hard metal-plated layers (5) are formed on at least one face of the auxiliary plate. Each of the layers (5) is extended from a position more radially inward than an annular bead of a base plate to a position radially outward, so that the layer is superposed with the annular bead and opposed to the top portion of the annular bead, annularly surrounding a cylinder hole of the base plate. This way, an excellent metal gasket can be obtained, and the gasket is of low cost and has high degree of freedom in controlling the amount of a step. <IMAGE>