SEAL STRUCTURE FOR OIL DROP HOLE IN CYLINDER HEAD GASKET

摘要

A cylinder head gasket 1 includes at least two first and second seal plates 11 and 12 in which oil drop holes 4 are perforated, respectively. On the first and second seal plates, half beads 11a and 12a that endlessly surround the oil drop holes and that project in a direction toward each other to be mutually pressed are formed, and the oil drop holes are sealed by these half beads. Outside of the respective half beads, auxiliary beads 11c and 12c that project in a direction toward each other to be mutually pressed are formed. Projection directions of the half beads and the auxiliary beads may be opposite to each other. Since the respective auxiliary beads 11c and 12c give acting forces that press the respective half beads 11a and 12a against a cylinder head or a cylinder block, a better sealing property can be secured as compared with a conventional cylinder head gasket.