초록 ▼

A metal gasket for an internal combustion engine is formed of at least one metal plate extending substantially throughout an entire area to be sealed. The metal plate includes a hole to be sealed, and a bead projecting outwardly from the metal plate to surround the hole. A concave is formed inside t

A metal gasket for an internal combustion engine is formed of at least one metal plate extending substantially throughout an entire area to be sealed. The metal plate includes a hole to be sealed, and a bead projecting outwardly from the metal plate to surround the hole. A concave is formed inside the bead to extend inwardly from an outer surface of the metal plate. A sealing material is disposed in the concave to project outwardly from the outer surface of the metal plate. Thus, even if a foreign material is disposed on the bead, the sealing ability of the gasket is not substantially affected.

대표청구항 ▼

1. A metal gasket for an internal combustion engine with a hole to be sealed, comprising: a first metal plate extending substantially throughout an entire area to be sealed, said first metal plate including a first hole corresponding to the hole of the engine, and a first bead projecting outwardl

1. A metal gasket for an internal combustion engine with a hole to be sealed, comprising: a first metal plate extending substantially throughout an entire area to be sealed, said first metal plate including a first hole corresponding to the hole of the engine, and a first bead projecting outwardly from the first metal plate to surround the first hole and having a concave formed inside the first bead, said concave extending inwardly from an outer surface of the first metal plate, a second metal plate including a second hole corresponding to the first hole and a second bead projecting outwardly from the second metal plate to surround the second hole and having a concave formed inside the second bead, said second metal plate being disposed on the first metal plate such that the concaves of the first and second metal plates are piled correspondingly and face outwardly of the metal gasket, and foamed sealing materials disposed in the respective concaves to project outwardly from the outer surfaces of the first and second metal plates, each foamed sealing material including an inside portion disposed in the concave and an outside portion located outside the concave, said outside portion having a length extending over a width of the concave in the width direction of the bead and a height projecting beyond the concave so that even if a foreign material is attached to one of the beads, the foreign material is retained in the foamed sealing material in the bead to substantially prevent an effect of the foreign material to a sealing ability of the bead. 2. A metal gasket according to claim 1, wherein said first bead has a flat portion and two lateral portions extending from the flat portion to form a trapezoid shape in section. 3. A metal gasket according to claim 2, wherein said length extending over the width of the concave is equal to or less than 2 mm. 4. A metal gasket according to claim 3, wherein said sealing material has a ratio in amounts of the inside portion to the outside portion, and ratio being 3:1 to 1:1. 5. A metal gasket according to claim 4, wherein said concave has a depth 1 to 3 times of the height of the outside portion projecting beyond the concave.