Abstract: A metal gasket for an internal combustion engine is formed of a metal plate, and includes a bead formed on the metal plate. The bead has a hardness at least partly different from that of the metal plate by heating the bead locally and then cooling the same. Accordingly, the surface pressure of the bead when the gasket is tightened can be adjusted as desired.

Abstract: A metal laminate gasket of the invention is formed of first, second and third metal plates. The first metal plate includes a curved portion to define a first hole corresponding to a hole of an engine to be sealed, and a flange extending from the curved portion. The second metal plate is located above a first base portion of the first metal plate, and has a second hole with a diameter greater than a size of the flange. The third metal plate is situated above the second metal plate, and includes an inner portion situated around a third hole under the flange. A stepped portion is formed between the inner portion and a third base portion by bending the third metal plate to have a thickness greater than that of the third metal plate. When the gasket is compressed, the stepped portion is disposed between an outer edge of the flange and an edge of the second hole and provides a surface pressure thereat. The stepped portion securely seals around the hole of the engine outside a main sealing device.

Abstract: A metal gasket used for an internal combustion engine is basically formed of a metal plate. The gasket includes at least two openings with a narrow intermediate area therebetween, edge portions situated around the openings, curved portions extending from the edge portions to define the openings, the curved portions situated adjacent to each other extending in the directions opposite to each other, and flange or turning portions extending from the curved portions and located over the edge portions. A stepped portion is located between the edge portions situated adjacent to each other. Therefore, when the gasket is tightened, the stepped portion is compressed to provide a surface pressure thereat to seal the narrow intermediate area.

Abstract: A metal gasket of the invention is used for an internal combustion engine, especially for an engine with a cylinder liner. The gasket is formed of a first metal plate having a first hole greater than a hole of the engine, an annular ring and a sealing device. The annular ring has an inner size substantially corresponding to the hole of the engine, an outer size substantially corresponding to the first hole, and a thickness greater than that of the first metal plate. The annular ring is situated inside the first hole and attached to the first metal plate. The sealing device provides a surface pressure on the first plate outside the annular ring. Even if there is a gap between the upper end of the cylinder liner and an upper surface of the cylinder block, the annular ring can seal around the hole together with the sealing device.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine. The gasket is formed of a plurality of metal plates for constituting the metal laminate gasket, wherein each metal plate has a hole corresponding to a fluid hole of the engine. A bead is formed on one of the metal plates to surround the hole for sealing therearound. Outer surface layers are coated on outer surfaces of the metal laminate gasket, and at least one inner surface layer is coated on at least one of inner surfaces of the metal plates. The outer surface layers are formed of a material containing rubber to closely contact the gasket to the engine parts, and the inner surface layer is formed of a material containing resin to provide sliding ability between the metal plates. The gasket can securely seal between the engine parts.

Abstract: A metal gasket of the invention is used for an internal combustion engine and is basically formed of one metal plate. The plate includes a hole, an elongated or annular recess formed on the metal plate to surround the hole and a bead formed in the elongated recess. The elongated recess extends from an outer surface of the metal plate, and the thickness of the bead is less than the thickness of the metal plate. A top portion of the bead projects outwardly beyond the outer surface of the metal plate. Thus, when the metal plate is tightened, the top portion of the bead is compressed to a level corresponding to the outer surface of the plate to protect the bead. Therefore, creep relaxation of the bead is reduced or prevented.

Abstract: A metal laminate gasket for an internal combustion engine is formed of a first metal plate, a second metal plate situated under the first metal plate, and a plurality of annular plates. The first metal plate includes a base portion, a plurality of curved portions extending from the base portion to define first holes, and a plurality of flanges extending from the curved portions to be disposed over the base portion. Each annular plate is situated between each flange and the base portion, and has at least one flat section and at least one partial bead section disposed at an intermediate portion between the first holes. The partial bead does not extend throughout an entire length of the annular plate. Therefore, when the gasket is tightened, the surface pressure at the intermediate portion can be increased to securely seal thereat. In case the rigidity of a cylinder head is not strong, the gasket is especially useful.

Abstract: A cylinder head gasket for an internal combustion engine of the invention is formed of at least one metal plate for constituting the cylinder head gasket. The gasket includes a cooling fluid path formed in the metal plate, which extends laterally for a predetermined distance. The cooling fluid path communicates with a circulation passage in the engine so that a cooling fluid flowing through the circulation passage enters into the cooling fluid path and cools the engine. Accordingly, a high temperature portion of the engine away from the circulation passage of the engine can be cooling efficiently.

Abstract: A metal laminate type cylinder head gasket of the invention is basically formed of first and second metal plates laminated together. The first metal plate includes a heat preventing portion for defining a first hole for a cylinder bore, a main sealing portion situated around the heat preventing portion, and a base portion. The heat preventing portion shuts off heat from the cylinder bore thereat, and the main sealing portion forms a solid portion for sealing around the first hole. The base portion extends from the main sealing portion to substantially cover the entire area of the engine. The second metal plate includes a second hole with a diameter greater than a diameter of the main sealing portion, and is situated adjacent to the base portion of the first metal plate. The second metal plate is not substantially affected by heat in the cylinder bore.

Abstract: A metal gasket for an internal combustion engine is formed of at least one metal plate for constituting the metal gasket. The metal plate includes a hole and a bead formed around the holes for sealing the same. A thermal sprayed layer is formed integrally on and/or under the bead to locally increase the surface pressure of the bead when the bead is compressed. Thus, the surface pressure of the bead can be adjusted individually as desired.

Abstract: A metal laminate gasket of the invention is formed of a first metal plate, and a second metal plate situated under the first metal plate. The first plate includes a main portion and a hollow member extending substantially perpendicularly from the main portion, and the hollow member has a plurality of projections at one end thereof. The second plate has a hole with a size slightly larger than an outer size of the hollow member. When the first and second plates are assembled, the hollow member is fitted in the hole and the projections are bent around the hole under the second plate to thereby securely connect the first and second plates.

Abstract: A manifold gasket of the invention is used for a manifold with at least three manifold holes arranged side by side. The gasket is basically formed of a metal plate for constituting the manifold gasket, which has two outer holes and at least one inner hole situated between the two outer holes. The metal plate includes two outer beads and at least one inner bead. Each outer bead surrounds each outer hole, and the inner bead surrounds the inner hole. Each outer bead forms a surface pressure less than that of the inner bead when the manifold gasket is compressed with a predetermined constant torque. Therefore, the outer bead has compressibility more than that of the inner bead to absorb deformation of the manifold when it is heated. The gasket can securely seal around the manifold holes.

Abstract: A metal gasket for an internal combustion engine of the invention is formed of a metal plate, which includes an outer periphery for defining the metal gasket, at least one cylinder bore, a bolt hole, and an oil hole situated between the bolt hole and the outer periphery. A bead is integrally formed with the metal plate to surround only the bolt hole and the oil hole. The bead is formed of two side walls and a center portion between the two side walls, and has a first portion close to the bolt hole and a second portion close to the oil hole. The width of the center portion at the first portion is smaller than that at the second portion and a standing angle of the side walls relative to the metal plate other than the bead at the first portion is smaller than that at the second portion. The bead can provide an equal surface pressure throughout the entire length thereof.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine. The gasket is formed of first and second metal plates extending substantially throughout an entire area of the gasket. The first plate includes a main portion, a curved portion for defining a first hole, and a flange extending from the curved portion. The second plate is situated under the main portion of the first plate, and includes a second hole in which the curved portion is located, an inner portion situated around the second hole and disposed on the flange, and a recess formed in the inner portion around the second hole to form a thin portion. At least one bead is formed on at least one of the first and second metal plates to surround the hole of the engine to seal the same. The surface pressure of the gasket around the hole can be adjusted by regulating the thickness of the thin portion.

Abstract: A metal gasket of the invention is used for an internal combustion engine, and is basically formed of a metal plate for constituting the gasket. The metal plate includes a hole and a bead around the hole for sealing therearound. A first coating layer is formed on at least a part of an upper surface of the metal plate except an upper portion of the bead. Thus, when the gasket is used, reduction of a surface pressure formed on the bead is prevented while fluid flowing through the hole is prevented by the bead and the first coating layer. The metal plate may be combined with one or more metal plates to constitute a metal laminate gasket.

Abstract: A metal gasket of the invention is used for an internal combustion engine. The gasket is formed of at least one metal plate for constituting the metal gasket. The gasket includes at least one bolt hole, and a bead having a main portion extending toward the bolt hole and an end portion located near the bolt hole. The end portion extending from the main portion changes a direction to incline in a direction away from the bolt hole. Accordingly, the end portion can be easily compressed when a bolt passing through the bolt hole is tightened. The plate with the bead may be combined with other plates to form a metal laminate gasket.

Abstract: A metal gasket for an internal combustion engine is installed between two engine parts. The metal gasket is formed of at least one metal plate extending substantially throughout an entire area of the engine to be sealed. The metal plate includes at least one bolt hole, a fluid hole situated near the bolt hole, a sealing device for surrounding the fluid hole to seal therearound, and a support bead situated around the sealing device without surrounding the bolt hole. The support bead is deviated from the fluid hole to balance surface pressure around the fluid hole when the engine parts are tightened. In case the gasket is formed of a plurality of metal plates, the sealing device and the support bead are formed on the different plates.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine. The gasket includes a main portion formed of at least two outer metal plates extending substantially throughout an entire area of the engine, a device for defining a first hole corresponding to a hole of the engine, and a coating applied onto a part of the defining device and one of the outer surfaces of the metal plates. The defining device are attached to the outer metal plates and has a plurality of dents near the first hole to surround the same. The coating is filled in the dents to cover a substantial area of the outer surface. Therefore, the coating does not substantially flow to thereby improve sealing around the first hole.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine having a cylinder bore and a fluid hole. The gasket is formed of first and second metal plates, and a coating layer situated between the first and second metal plates. The first plate has first and second holes corresponding to the cylinder bore and fluid hole. The first plate includes a main portion, a curved portion to define the first hole, a flange, and a first bead formed in the main portion to surround the first hole. The first bead projects toward the flange to be disposed above the flange. The second plate is situated under the main portion, and includes a third hole in which the curved portion is located, a fourth hole corresponding to the fluid hole, and a second bead surrounding the flange and projecting in a same direction as in the first bead. A third bead is formed on one of the first and second metal plates to seal around the fluid hole of the engine.

Abstract: A metal laminate gasket of the invention is engaged with an engaging projection of an engine part for immovably locating the gasket on the engine part. The gasket is basically formed of first and second metal plates laminating together. The first plate includes at least one first hole and at least one first engaging portion extending into the first hole. The second plate is situated above and connected to the first plate. The second plate includes at least one second hole and at least one second engaging portion extending into the second hole. When the gasket is urged against the engine part, the vertically spaced first and second engaging portions deform and engage the engaging projection to thereby prevent the gasket from easily disengaging from the engaging projection.