US 2004/0164497 A1 · Metal gasket

Abstract

A metallic gasket including a base plate having a convex metal bead formed, by bending the base plate, between a combustion chamber opening and on the outer periphery portion of the base plate, and a first thickness-increased portion formed thicker than the remaining portions of the base plate to provide a difference in thickness, by which a surface pressure is made to concentrate on the first thickness-increased portion to seal a joint between a cylinder head and a cylinder block when the metallic gasket is disposed between the joint surfaces of the cylinder head and the cylinder block and fastened by clamping bolts. An elastic sealing material is fixed to the convex portion of the metal bead and filled in a concave portion on the reverse side of the base plate to form a rubber bead, and the sealing material is deformed under compression in the through-thickness direction in cooperation with the deformation of the metal bead when the gasket is fastened with clamping bolts. This gasket reduces production cost and preserves a stable sealing performance for extended periods of time.

Claims23

Dependent claims

A metallic gasket including a base plate made of a thin metal plate, said base plate having one or not less than two openings, such as bolt holes, and having beads formed along seal lines and a first thickness-increased portion made thicker than the remaining portions of said base plate, a surface pressure being made to concentrate on said first thickness-increased portion and said beads being deformed in a through-thickness direction to thereby seal a joint of opposing joint surfaces when said metallic gasket is sandwiched between the joint surfaces and fastened by clamping bolts,

wherein said bead comprises, in combination, a metal bead and a rubber bead, said metal bead being formed by bending said base plate in a through-thickness direction to create a convex portion, on one surface side of said base plate, with a height higher than the thickness of said first thickness-increased portion, and said rubber bead made of an elastic sealing material being fixed to a surface of said convex portion of said metal bead and filled in a concave portion opposite said convex portion, wherein said rubber bead is compressed and deformed in the through-thickness direction in cooperation with deformation of said metal bead.

A metallic gasket comprising a base plate made of a thin metal plate having formed therein a plurality of combustion chamber openings arranged adjacent to each other, and a thickness-increased portion thicker than the remaining portions of said base plate, and seal lines formed encircling said internal circumference of each combustion chamber opening, and beads formed along said seal lines,

wherein in a boundary area between said adjacent combustion chamber openings, common beads are formed and shared by beads around said adjacent combustion chamber openings, wherein beads formed along neighboring peripheral edges of said adjacent combustion chamber openings are combined to form a bead in an integral structure, wherein the width of said thickness-increased portions located in said boundary area and extending along said internal circumferences of said combustion chamber openings are set in proportion to a clearance between said adjacent combustion chamber openings, wherein said bead is a composite body of a metal bead formed as a convex portion having a height higher than said thickness-increased portion by bending said base plate in the through-thickness direction, and a rubber bead formed by fixing to said convex portion surface of said metal bead an elastic sealing material capable of exhibiting a spring force by compressing and deforming in the through-thickness direction and by filling said concave portion on the reverse side of said convex portion with said elastic sealing material, and wherein said elastic sealing material is fixed at least to the surface of said convex portion of said metal bead and the height of said elastic sealing material is set to be equal to or substantially equal to the height of said metal bead.

A metallic gasket including a base plate made of a thin metal plate, said base plate having a plurality of seal lines, a bead formed along each of said seal lines, and a converge-diverge part formed where at least some of said plurality of seal lines converge or diverge at specified points,

wherein said bead formed along each of said seal lines comprises, in combination, a metal bead and a rubber bead, said metal bead being formed in a convex form only on one surface of said base plate by bending in a through-thickness direction thereof and a rubber bead made of an elastic sealing material being fixed to a surface of said convex portion of said metal bead and filled in a concave portion on the reverse side of said convex portion, said rubber bead being compressed and deformed in said through-thickness direction in cooperation with the deformation of said metal bead, and wherein at least in said converge-diverge part, said elastic sealing material on a surface of said convex portion is fixed at least to a surface of said metal bead and the height of said rubber bead is set to be equal to or substantially equal to the height of said metal bead.

Dependencies are inferred from the claim text.

Metal gasket

Life of this patent

Metal gasket

Life of this patent

Abstract

Claims23