Abstract: A cylinder head gasket is provided for dealing with gas leak between cylinder bores of an engine with a reduced size and rigidity. A cylinder head gasket is formed of one or more metal plates. One metal plate is provided with a first bead, a second bead, and a third bead arranged from inside in this order around a cylinder bore. The first bead is formed around each of the cylinder bores. The second beads are combined into a single bead having a width greater than a width of other section of the second beads in an area between adjacent cylinder bores. The third bead does not pass through the area between the adjacent cylinder bores and surrounds all of the cylinder bores.

Abstract: A metal laminate gasket includes a first plate, intermediate plate and a second plate laminated together. The first plate has a curved portion for defining a hole to be sealed, and a flange extending outwardly from the curved portion. The intermediate plate is situated above the first plate laterally outside the flange. The second plate is situated above the intermediate plate and has a first bead disposed inside the intermediate plate and under the flange, and a second bead disposed outside the first bead and adjacent the flange. The second bead projects upwardly beyond the flange and has an inner section immediately outside the flange and an outer section outside the inner section. The inner section is inclined greater than the outer section.

Abstract: A metal gasket for an internal combustion engine is formed of a metal plate including a base portion extending substantially throughout an entire area to be sealed, at least one hole formed in the base portion, a curved portion extending from the base portion, and a flange extending from the curved portion and disposed on a part of an upper surface of the base portion. A coating member is deposited on the flange facing the base portion and/or the base portion facing the flange. The coating member is formed of a non-thermoplastic coating material to operate as a surface pressure regulating member between the flange and the base portion to thereby regulate a surface pressure at the flange.

Abstract: A metal gasket is formed of a metal base plate for sealing between two members. The metal gasket has a bead around a cylinder bore and a bead around a fluid hole. The coatings are applied on both surfaces of the beads, respectively. When the metal gasket is tightened, strong sealing surface pressures are locally generated at sealing line portions. The thicknesses of the coatings at the sealing line portions are formed to be thinner than those of the other portions.

Abstract: A cylinder head gasket for an internal combustion engine includes a first metal plate having first holes and first beads formed around the respective first holes, and a second metal plate disposed under the first metal plate and having a second bead extending toward the first metal plate. A distance between the first and second beads or a width of at least one of the first and second beads at a high heat load portion of the cylinder bore is formed to be greater than a distance between the first and second beads or a width of at least one of the first and second beads at a low heat load portion of the cylinder bore to thereby reduce a surface pressure at the high heat load portion.

Abstract: A metal gasket seals two engine members of an internal combustion engine. The metal gasket includes a metal gasket member extending substantially throughout an entire area of the engine members and has two surfaces to contact the engine members. At least two seal coatings are coated on the two surfaces of the gasket member to constitute sealing lines on the surfaces of the gasket member. One of the sealing lines on one surface of the metal gasket member is shifted from the other of the sealing lines on the other surface of the metal gasket member. Micro coatings are coated on the two surfaces of the gasket member. The thickness of the micro coating is less than that of the seal coating.

Abstract: A cylinder head gasket for sealing between a cylinder head and a cylinder block of an engine is formed of a base plate made of a first metal material, such as an annealed stainless material and a soft steel material, and at least one circumferential member made of a second metal material, such as a spring steel material, disposed at a portion for sealing a liquid hole provided on an area outside an area surrounded by bolt holes. On the circumferential member, there is provided a bead surrounding the liquid hole, and also, the circumferential member is integrally connected to the base plate.

Abstract: In a cylinder head gasket, a base plate forming the gasket is formed of a first metallic material, and a grommet is provided around a hole for a cylinder bore and formed of a second metallic material different from the first metallic material. The grommet and the base plate are connected by welding. Accordingly, the grommet formed of the optimum material can be provided around the hole for the cylinder bore, and the base plate can be formed of the optimum material. Thus, the cylinder head gasket has a good sealing ability and excellent durability.

Abstract: A cylinder head gasket is formed of a metal plate, a sealing bead formed in the metal plate around a liquid hole, and a peripheral bead formed in the metal plate to extend around a periphery of the metal plate. At least a part of the peripheral bead is set to have a surface pressure lower than that of the sealing bead when the gasket is tightened by that the height of the peripheral bead is lower than that of the sealing bead or the width of the peripheral bead is greater than that of the sealing bead. Thus, when the gasket is tightened, substantially uniform and optimum load share can be obtained on the peripheral bead and the sealing bead for the fluid hole.

Abstract: A metal gasket is formed by a bead plate provided with a continuous bead, and an outer plate partly bent around combustion chamber holes to laminate the metal plates together. The bead has a linear common portion situated in an intermediate area between two cylinder bore holes, curved surrounding portions diverging from the linear common portion near the one second hole to partly surround the cylincder bore and water hole, and a curved linking portion extending between the curved surrounding portions to partly surround the water hole. The water hole is completely surrounded by the parts of the curved surrounding portions and the curved linking portion.

Abstract: A cylinder head gasket is formed of a single metal base plate for sealing between a cylinder head and a cylinder block of an internal combustion engine. The cylinder head gasket has a primary sealing portion including a grommet or shim around a cylinder bore, and a secondary sealing portion outside the primary sealing portion. The secondary sealing portion is formed of a bead and a foamed coating layer coated on one side or both sides of the bead to cover at least a portion of the bead in a belt shape.

Abstract: A cylinder head gasket for an internal combustion engine is formed by a first metal plate extending substantially throughout an entire area to be sealed and having a first hole corresponding to a hole of the engine, and second and third metal plates disposed to sandwich the first plate and having second and third holes formed in the respective second and third plates corresponding to the first hole. First and second beads are formed in the respective second and third plates to extend toward the first metal plate. A first resin coating is deposited on at least one side of the first metal plate at an inner portion relative to the first bead, and a second resin coating is deposited on at least one side of the first metal plate at an outer portion relative to the first bead without extending over an entire surface thereof. The second resin coating has a thickness at most equal to that of the first resin coating. The surface pressure around the hole can be adjusted precisely.

Abstract: A metal gasket for an internal combustion engine is formed of a metal plate including a base portion extending substantially throughout an entire area to be sealed, at least one hole formed in the base portion, a curved portion extending from the base portion, and a flange extending from the curved portion and disposed on a part of an upper surface of the base portion. A coating member is deposited on the flange facing the base portion and/or the base portion facing the flange. The coating member is formed of a non-thermoplastic coating material to operate as a surface pressure regulating member between the flange and the base portion to thereby regulate a surface pressure at the flange.

Abstract: A cylinder head gasket is used for an internal combustion engine with at least three cylinder bores. The gasket is formed of a metal plate extending substantially throughout an entire area to be sealed, and a reinforce coating. The metal plate includes two end holes, at least one inner hole sandwiched between the two end holes, and beads surrounding the respective holes. The two end holes and at least one inner hole are arranged linearly to correspond to the cylinder bores of the engine. The reinforce coating is deposited around the peripheral portion of the at least one inner hole so that sealing pressures are formed substantially equally around the two end holes and at least one inner hole. Other reinforce coatings may be deposited around the peripheral portions of the end holes.

Abstract: A cylinder head gasket for an internal combustion engine includes a first metal plate having first holes and first beads formed around the respective first holes, and a second metal plate disposed under the first metal plate and having a second bead extending toward the first metal plate. A distance between the first and second beads or a width of at least one of the first and second beads at a high heat load portion of the cylinder bore is formed to be greater than a distance between the first and second beads or a width of at least one of the first and second beads at a low heat load portion of the cylinder bore to thereby reduce a surface pressure at the high heat load portion.

Abstract: A metal gasket seals two engine members of an internal combustion engine. The metal gasket includes a metal gasket member extending substantially throughout an entire area of the engine members and has two surfaces to contact the engine members. At least two seal coatings are coated on the two surfaces of the gasket member to constitute sealing lines on the surfaces of the gasket member. One of the sealing lines on one surface of the metal plate is shifted from the other of the sealing lines on the other surface of the metal plate. Micro coatings are coated on the two surfaces of the gasket member. The thickness of the micro coating is less than that of the seal coating.

Abstract: A metal gasket is formed of a metal base plate for sealing between two members. The metal gasket has a bead around a cylinder bore and a bead around a fluid hole on the metal base plate. Coatings are applied on both surfaces of the beads, respectively. When the metal gasket is tightened, strong sealing surface pressures are locally generated at sealing line portions of the beads. The coatings are applied only on other portions except for the sealing line portions.

Abstract: A metal gasket is formed of a metal base plate for sealing between two members. The metal gasket has a bead around a cylinder bore and a bead around a fluid hole. The coatings are applied on both surfaces of the beads, respectively. When the metal gasket is tightened, strong sealing surface pressures are locally generated at sealing line portions. The thicknesses of the coatings at the sealing line portions are formed to be thinner than those of the other portions.

Abstract: A metal laminate gasket for an internal combustion engine is formed by a first metal plate having a first hole corresponding to a hole of the engine, and a bore ring and a second metal plate both being disposed under the first metal plate. The bore ring has a second hole corresponding to the first hole, and at least two first engaging members formed around an outer periphery thereof with a predetermined distance away from each other. The second metal plate includes a third hole having a size for receiving the outer periphery of the bore ring, and at least two second engaging members formed around an inner periphery thereof to engage the at least two first engaging members. The first and second engaging members are arranged such that the bore ring can be positioned and retained in the second metal plate in only one position even if the bore ring is positioned upside down.

Abstract: A cylinder head gasket for an internal combustion engine is formed of one metal plate having a base portion extending substantially throughout an entire area to be sealed, a hole formed in the base portion corresponding to the hole of the engine, and a bead surrounding the hole. A resin coating is deposited on at least a part of the bead of the metal plate. Thus, the bead is reinforced and sealing ability is improved.