Metal gasket
AssigneeNippon Gasket Co., Ltd.
InventorsKenji Kubouchi, Kunitoshi Inoue
Life of this patent
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Abstract
A metal gasket comprising an elastic metal plate including beads formed around cylinder bore holes of a multiple-cylinder engine, wherein each bead comprises an independent bead formed around each hole, a common bead between an adjacent pair of holes and junction beads connecting the independent bead and the common bead. The metal gasket controls a spring constant at the junction beads to a suitable value by specifying the shape of the junction beads, reduces a peak value of a face-to-face pressure at the junction beads and makes uniform the face-to-face pressure in the vicinity of the junction beads.
Claims3
A metal gasket including:
- an elastic metal plate;
- adjacent cylinder bore holes in said metal plate;
- beads formed around said cylinder bore holes by a deformation of said metal plate such that one surface of the metal plate is convex and the other surface of the metal plate is concave;
- said beads further comprising:
- independent bead parts formed in a region other than a region between said cylinder bore holes;
- junction bead parts formed in a region where said independent bead parts merge with each other;
- and
- common bead parts connecting with said junction bead parts and disposed in a region between said cylinder bore holes;
- wherein said independent bead parts each has a bead deformation first width, between inner borders and outer borders, extending along said cylinder bore holes, and said first width is substantially uniform around said cylinder bore holes;
- said common bead parts having a bead deformation second width between said inner borders extending from one to another of said adjacent cylinder bore holes, and said common bead parts are straight;
- said junction bead parts each encompassed by an arcuate smooth line connecting said outer borders of said independent bead parts, and by a smooth curve line connecting said independent bead parts and said common bead parts;
- and
- said bead width of said common bead parts and said bead width of said independent bead parts being equal.
Dependencies are inferred from the claim text.