Patent ID: 7815197

Claim:
A gasket comprising: a base plate provided with combustion chamber holes and base plate beads, each disposed to surround each of the combustion chamber holes; a shim plate thinner than the base plate and stacked around each of the combustion chamber holes of the base plate, said shim plate disposed to extend from a first flat part, which is a flat part of the base plate from each of the combustion chamber holes to the base plate bead, through a position where the base plate bead is formed, to a second flat part, which is another flat part spaced away from each of the combustion chamber holes; and two or more strips of deformable auxiliary beads extending along the circumference of each of the combustion chamber holes so as to form seal lines, respectively, being disposed in a position opposing said first flat part, and protruding on one side of said shim plate, wherein a flat portion on the shim plate adjacent to the two or more strips of auxiliary beads is spaced from each of the combustion chamber holes by the two or more strips of auxiliary beads, the flat portion of the shim plate opposing the base plate bead, and wherein a part of the shim plate opposing said first flat part is a thickened part whose thickness is increased by stacking one or more additional shim plates, such that only the part of the shim plate opposing the first flat part is thickened, and said auxiliary beads are formed on at least one of the shim plates constituting the thickened part.