Patent ID: 6056296
Filing Date: 2000-05-02
Classification: F02F,F16J

Abstract:
A metal gasket adapted to seal clearances between opposed surfaces of a three-surface combining portion comprising a cylinder block provided with combustion chambers, a chain case disposed adjacently to said cylinder block so as to form a passage therein, and a cylinder head disposed on and adjacently to said cylinder block and said chain case, said gasket comprising:a first elastic metal plate adapted to be disposed so as to face said cylinder block and said chain case, and a second elastic metal plate adapted to be disposed so as to face said cylinder head and laminated on said first elastic metal plate,said first and second elastic metal plates being provided with combustion chamber holes in portions thereof which are opposed to said combustion chambers in said cylinder block, and an opening in portions thereof which are opposed to said passage in said chain case,said first elastic metal plate being provided with a bead extending along a circumference of said opening, and a full bead on a region thereof which is opposed to said opposed surfaces of said three-surface combining portion,a ridge of said full bead formed on said first elastic metal plate contacting said second elastic metal plate, an elastic member being provided in a recessed portion of said full bead so that said elastic member is positioned correspondingly to contact portions of said cylinder block and said chain case,wherein said full bead on said first elastic metal plate is formed so that a center line thereof extends along said opposed surfaces of said three-surface combining portion, said elastic member being provided in said recessed portion of said full bead so that said elastic member extends along said opposed surfaces of said three-surface combining portion, andwherein when said elastic member is tightened by said cylinder block, said chain case and said cylinder head member, said elastic member is compression deformed so that it comprises a first elastic portion disposed between said elastic metal plate and said cylinder block, a second elastic portion disposed between said elastic metal plate and said chain case, and a third elastic portion forcibly fitted in a clearance occurring between contact portions of said cylinder block and said chain case.