Metallic cylinder head gasket
View Patent ↗A metal gasket has at least two metal layers having an aligned fluid-conveying opening. One of the metal layers includes a carrier layer and an active layer. The active layer has a raised metal sealing bead circumscribing the opening. The carrier layer and the active layer are at least partially coplanar and are spaced from one another within the plane by at least one cut-out region between the carrier layer and the active layer. The cut-out region allows the active layer to move out of the plane of the carrier layer, and thus, the active layer is able to self-adjust for sealing engagement between opposing surfaces in assembly and during use.
1. A metal gasket, comprising:
a pair of metal layers having aligned fluid-conveying openings, each of said metal layers comprising a carrier layer portion and an active layer portion being at least partially coplanar with one another, said active layer portions having a raised metal sealing bead circumscribing said opening;
wherein said carrier layer portion and said active layer portion in each metal layer are spaced from one another within the plane by at least one cut-out region, said cut-out region allowing said active layer portion to move out of the plane of said carrier layer;
each of said pair of metal layers having webs extending between said carrier layer portion and said active layer portion and attaching said carrier layer portion and said active layer portion to one another;
said cut-out regions and said webs of said pair of metal layers being arranged in mirrored relation with one another; and
another metal layer disposed between said pair of metal layers, said another metal layer extending entirely across said cut-out regions.
2. The metal gasket of claim 1 wherein said carrier layer portion and said active layer portion are spaced from one another by at least two of said cut-out regions.
3. The metal gasket of claim 2 wherein said webs are formed as one piece of material with said carrier layer portion and said active layer portion.
4. The metal gasket of claim 2 wherein said cut-out regions are spaced symmetrically about said bead.
5. The metal gasket of claim 2 wherein said cut-out regions occupy an area greater than said webs.
6. The metal gasket of claim 2 wherein said webs are flexible.
7. The metal gasket of claim 1 wherein said another metal layer has a raised metal sealing bead shaped to nest with said sealing bead of said active layer portion.
8. The metal gasket of claim 1 wherein said sealing beads on said two active layer portions extend outwardly from said another metal layer and away from one another to a pair of annular crests.
9. The metal gasket of claim 1 wherein said sealing beads on said two active layer portions nest with one another.