Steel laminate gasket with wide sealing area

Claim 2

A steel laminate gasket for an internal combustion engine having at least one hole therein, comprising, a first plate having at least one first hole therein corresponding to the hole of the engine, said first plate including a base portion, at least one curved portion integrally formed with the base portion to extend transversely with respect to the base portion to surround and define the first hole, at least one flange integrally formed with the curved portion and located at a side of the base portion to extend substantially parallel to the base portion and surrounding the first hole, at least one side wall formed at one of the base portion and the flange, said side wall being spaced apart from the curved portion to surround the first hole, and an area around the first hole surrounded by the side wall and the curved portion for forming an embossed portion, a second plate situated at a flange side of the first plate, said second plate having at least one second hole therein, the size of the second hole being larger than the size of the flange so that when the gasket is assembled, the flange is located inside the second hole, and a third plate situated adjacent to the second plate and having a solid portion situated between the flange and base portion inside the embossed portion, distance between an outer surface of the third plate and an outer surface of the base portion of the first plate laterally outside the side wall being smaller than distance between outer surfaces of the flange and the base portion laterally inside the side wall, thickness of the solid portion being greater than that of the third plate and thinner than an inner space between the flange and base portion inside the embossed portion so that when the gasket is tightened, the side wall deforms to seal thereat.

Claim 3

A steel laminate gasket according to claim 1, wherein said embossed portion has an outer surface which is substantially flat and parallel to an outer surface of one of the base portion and flange facing against the embossed portion.

Claim 4

A steel laminate gasket according to claim 2, wherein said third plate includes a main portion and a flange turned over the main portion, said solid portion being non-compressible and formed by the flange and the main portion piled over the flange.

Claim 5

A steel laminate gasket according to claim 3, wherein lateral width of the flange of the third plate is shorter than the lateral width of the embossed portion.

Claim 6

A steel laminate gasket according to claim 4, wherein the distance between the flange of the first plate and a portion of the base portion laterally inside the side wall, when the gasket is properly tightened, is greater than the distance between the base portion and the third plate laterally outside the side wall.

Claim 7

A steel laminate gasket according to claim 5, wherein difference between the distance laterally inside the side wall and the distance laterally outside the side wall is between 0.05 and 0.1 mm.

Claim 8

A steel laminate gasket according to claim 1, wherein said second plate further includes seal coatings on both sides thereof.

Claim 9

A steel laminate gasket according to claim 1, wherein the embossed portion is formed on the base portion.

Claim 10

A steel laminate gasket according to claim 1, wherein the embossed portion is formed on the flange of the first plate.

Claim 11

A steel laminate gasket according to claim 1, wherein said side wall of the embossed portion is positioned diagonally relative to one of the flange and the base portion.

Claim 12

A steel laminate gasket according to claim 1, wherein said embossed portion includes the lateral width shorter than the lateral width of the flange of the first plate.

Claim 13

A steel laminate gasket for an internal combustion engine having at least one hole therein, comprising, a first plate having at least one first hole therein corresponding to the hole of the engine, said first plate including a base portion, at least one curved portion integrally formed with the base portion to extend transversely with respect to the base portion to surround and define the first hole, at least one flange integrally formed with the curved portion and located at a side of the base portion to extend substantially parallel to the base portion and surrounding the first hole, at least one side wall formed at one of the base portion and the flange, said side wall being positioned to space apart from the curved portion to surround the first hole, and an area around the first hole surrounded by the side wall and the curved portion for forming an embossed portion, a second plate situated at a flange side of the first plate, said second plate having at least one second hole therein, the size of the second hole being larger than the size of the flange so that when the gasket is assembled, the flange is located inside the second hole, and a third plate situated adjacent to the second plate and having a solid portion situated between the flange and the base portion inside the embossed portion, distance between an outer surface of the third plate and an outer surface of the base portion of the first plate laterally outside the side wall being smaller than distance between outer surfaces of the flange and the base portion laterally inside the side wall, said distance between the outer surfaces of the flange and the base portion laterally inside the side wall, when the gasket is tightened, being reduced by deforming the side wall so that the flange, the base portion and the solid portion closely pile and abut against each other to thereby incompressibly seal around the hole of the engine, and the deformed side wall resiliently seals around the hole of the engine.

Claim 14

A steel laminate gasket for an internal combustion engine having at least one hole therein, comprising, a first plate having at least one first hole therein corresponding to the hole of the engine, said first plate including a base portion, at least one curved portion integrally formed with the base portion to extend transversely with respect to the base portion to surround and define the first hole, at least one flange integrally formed with the curved portion and located at a side of the base portion to extend substantially parallel to the base portion and surrounding the first hole, at least one side wall formed at one of the base portion and the flange, said side wall being positioned to space apart from the curved portion to surround the first hole, and an area around the first hole surrounded by the side wall and the curved portion for forming an embossed portion, a second plate situated at a flange side of the first plate, said second plate having at least one second hole therein, the size of the second hole being larger than the size of the flange so that when the gasket is assembled, the flange is located inside the second hole, and a third plate situated adjacent to the second plate and having a solid portion situated between the flange and the base portion inside the embossed portion, distance between an outer surface of the third plate and an outer surface of the base portion of the first plate laterally outside the side wall being smaller than distance between outer surfaces of the flange and the base portion laterally inside the side wall, said distance between the outer surfaces of the flange and the base portion laterally inside the side wall, when the gasket is tightened, being reduced by deforming the side wall so that the flange, the base portion and the solid portion closely pile and abut against each other to thereby incompressibly seal around the hole of the engine, and the deformed side wall resiliently seals around the hole of the engine.