Patent ID: 8016296

Claim:
A metal laminate gasket for an internal combustion engine having a cylinder bore and a fluid hole, comprising: a first metal plate including a base portion, a curved portion extending from the base portion to define the cylinder bore, and a folded portion extending from the curved portion and located under the base portion; a second metal plate provided in between the base portion and the folded portion; a third metal plate provided in between the base portion and the folded portion and including an extension portion extending outwardly from the folded portion; a fourth metal plate overlapping the base portion outside the folded portion and partially overlapping a part of the extension portion of the third metal plate, the fourth metal plate having a thickness greater than that of the first metal plate; a fifth metal plate overlapping the base portion without overlapping the third metal plate; a bead provided on at least one of the second and third metal plates and situated inside the folded portion; a first seal portion constituted of the base portion and the folded portion sandwiching the second and third metal plates; a second seal portion constituted of the base portion, the extension portion of the third metal plate and the fourth metal plate; and a third seal portion constituted of the base portion and the fourth and fifth metal plates, wherein a total thickness of the metal plates forming the second seal portion is greater than that forming the third seal portion and is smaller than that forming the first seal portion, and the total thickness declines in a stepwise fashion from the first seal portion to the third seal portion.