US 5,690,343 A · Metal gasket

Abstract

In this metal gasket, the beads formed on an intermediate plate prevent a full compression of bead plates and improve the sealability of the gasket. This metal gasket comprises first and second bead plates having main beads extending along the circumferences of holes, and an intermediate plate interposed between the first and second bead plates. The intermediate plate is provided in the regions thereof which are between the holes and the main bead-contacting portions thereof with beads opposed to the first bead plate, and these beads form compensating portions for the first bead plate. The second bead plate is provided with auxiliary beads having projecting portions engageable with the recessed portions of the beads on the intermediate plate. The compensating portions mentioned above prevent a full compression of the beads on the bead plates when the metal gasket is tightened, and offset the irregularity of the opposed surfaces of a cylinder head and a cylinder block. The auxiliary beads improve the sealability of the second bead plate with respect to the compensating portion-carrying intermediate plate.

Claims18

Dependent claims

A metal gasket comprising

first and second bead plates formed by elastic metal plates on which main beads are formed along the circumferences of congruent holes, and
an intermediate plate interposed between said first and second bead plates on which said main beads are arranged in an opposed state, and having a thickness larger than that of said first and second bead plates,
said intermediate plate being provided in the regions thereof which are on the inner side of main beads with secondary beads extending toward said first bead plate, said secondary beads having a height smaller than that of said main beads,
said second bead plate being provided with auxiliary beads having projecting portions engageable with recessed portions of said secondary beads on said intermediate plate.

1 more element

A metal gasket comprising

an elastic-metal first bead plate including a first main bead formed along a circumference of a hole, the first main bead comprising a raised portion of the first bead plate extending in a single first direction away from the first bead plate;
an elastic-metal second bead plate including a second main bead formed along the circumference of the hole, the second main bead comprising a first raised portion of the second bead plate extending in a single second direction away from the second bead plate;
an intermediate plate interposed between the first bead plate and the second bead plate,
the first bead plate and the second bead plate being oriented with the first direction and the second direction opposed, whereby the first main bead and the second main bead may contact the intermediate plate on opposing sides of the intermediate plate;
a secondary stopper bead comprising a raised portion of the intermediate plate extending in the single second direction to a stopper height, the stopper bead being disposed between the hole and the second main bead;
an auxiliary bead comprising a second raised portion of the secondary bead plate extending in the single second direction away from the second bead plate;
the auxiliary bead being aligned with the stopper bead and having substantially the stopper height;
the stopper bead including a recessed portion having a depth generally equal to the stopper height, whereby a projecting portion of the auxiliary bead is engageable with the recessed portion of the stopper bead of the intermediate plate for sealing therebetween.

5 more elements

Dependencies are inferred from the claim text.

Metal gasket

Life of this patent

Metal gasket

Life of this patent

Abstract

Claims18