Patent ID: 6814357
Filing Date: 2004-11-09
Classification: F16J

Abstract:
Cylinder head gasket with a gasket plate having at least one combustion chamber opening and comprising at least first and second sheet metal layers, said first sheet metal layer having a first annular zone surrounding the combustion chamber opening and being provided with at least one bead which is elastically deformable in its height and encloses the combustion chamber opening, and said second sheet metal layer having a second annular zone surrounding the combustion chamber opening and being provided with at least one deformation delimiting device delimiting deformation of the bead, surrounding the combustion chamber opening and lying close to the bead in plan view of the gasket plate, the deformation delimiting device being formed by such a plastic deformation of the second sheet metal layer that the second sheet metal layer has in at least one of its main surfaces in the area of the deformation delimiting device a pattern of stamped depressions with which elevations formed by material of the second sheet metal layer displaced during the stamping of the depressions are associated, the total thickness of the second sheet metal layer in the area of the deformation delimiting device being greater than the original thickness of the second sheet metal layer in an area of the second sheet metal layer adjoining the deformation delimiting device, wherein the original second sheet metal layer is formed by a steel sheet which is plastically deformable by flow processing, and in a plan view of the second sheet metal layer the deformation delimiting device forms a two-dimensional pattern of discrete, cup-like depressions which are discontinuous in a circumferential direction of the combustion chamber opening, the total volume of the depressions stamped by flow pressing being approximately, equal to the total volume of the elevations formed by the material of the second sheet metal layer that is displaced during the stamping of the depressions.