| 摘要 |
Disclosed is a two-material composite gasket, preferably a two-material composite annular gasket, for sealing a gap between two opposing surfaces, one of the surfaces having a concave gap portion, which is to be sealed by the gasket, the gasket having an oblong cross-sectional shape and having projections on the top end and bottom end thereof, the gasket including an upper low-hardness elastomer molded part formed of vulcanized rubber having a Shore A hardness of 5 to 35, a lower high-hardness elastomer molded part formed of vulcanized rubber having a Shore A hardness of 45 to 80, and a parting line bonding the low-hardness elastomer molded part and the high-hardness elastomer molded part, the parting line being positioned so that the height of the low-hardness elastomer molded part is 5 to 40% of the height of the entire gasket. The two-material composite gasket enables three-surface simultaneous sealing of a gap formed by three members, as typified in a joint structure composed of a cylinder block, a cylinder head, and a chain cover of an automobile engine.
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