Cylinder head gasket with expanded graphite filler
AssigneeFelt Products Mfg. Co.
InventorDaniel E. Czernik
Life of this patent
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Abstract
An improved cylinder head gasket assembly for an internal combustion engine. The zone of the metallic core of the gasket assembly immediately surrounding a combustion chamber is provided with an annular embossment defining a recess which is at least partially filled with a flexible, expanded compressible graphite material. The zone of the embossment is devoid of facing layers. Preferably, the embossment is embraced and ensheathed by armoring, so that the graphite material seals between the armor and the metallic core, all to enhance sealing of the combustion chamber. A secondary embossment filled with graphite material may provide a secondary seal.
Claims10
An improved cylinder head gasket assembly for an internal combustion engine adapted to be positioned between an engine head and an engine block, said gasket assembly defining at least one combustion opening, said gasket assembly comprising:
- a main body portion comprising a central metallic core having first and second main surfaces and composite facing layer on each of said main surfaces and overlying the substantial majority of each of said surfaces,
- said central metallic core defining said combustion opening and said facing layers being spaced away from said combustion opening and defining zones surrounding said combustion opening essentially devoid of facing layers,
- an annular embossment in said core surrounding said combustion opening intermediate said combustion opening and said facing layers, said embossment comprising an annular projection extending outwardly of one main core surface and an annular recess extending inwardly of said other main core surface, and
- compressible, flexible expanded graphite disposed in and at least partially filling said annular recess,
- whereby when said gasket assembly is disposed and compressed between an engine head and an engine block, said embossment is compressed and said flexible expanded graphite is compressed to effect a seal in the zone of the embossment between said head and said block to minimize leakage and enhance the sealing effect of the gasket assembly at said combustion opening and to minimize degradation of the seal effected thereat.
An improved cylinder head gasket assembly for an internal combustion engine adapted to be positioned between an engine head and an engine block, said gasket assembly defining at least two spaced apart adjacent combustion openings, said gasket assembly comprising:
- a main body portion comprising a central metallic core having first and second main surfaces and composite facing layer on each of said main surfaces and overlying the substantial majority of each of said surfaces,
- said central metallic core defining said combustion openings and said facing layers being spaced away from said combustion openings and defining zones surrounding said combustion openings essentially devoid of facing layers,
- an annular embossment in said core surrounding each said combustion opening intermediate said combustion opening and said facing layers, said embossment comprising an annular projection extending outwardly of one main core surface and an annular recess extending inwardly of said other main core surface, and
- compressible, flexible expanded graphite disposed in and at least partially filling said annular recess, and
- armor for said combustion openings and wherein said peripheries of said combustion openings are embraced by said armor,
- whereby when said gasket assembly is disposed and compressed between an engine head and an engine block, said embossment is compressed and said flexible expanded graphite is compressed to effect a seal in the zone of the embossment between said head and said block to minimize leakage and enhance the sealing effect of the gasket assembly at the combustion openings.
Dependencies are inferred from the claim text.