Abstract: A cylinder head gasket for an internal combustion engine is formed of a metal plate extending substantially throughout an entire area to be sealed. The metal plate has a plurality of holes corresponding to cylinder bores of the engine, a plurality of beads surrounding the respective holes, and at least one area situated between the holes adjacent to each other. Seal coatings are deposited above the beads in the area. The seal coating has heatproof characteristic and compressibility to strengthen surface pressure of the beads at the area.

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: 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 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.

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 of the invention 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: In the gasket, a shim member formed of shim portions and connecting portion is assembled with an upper metal plate with curved portions and flanges such that each shim portion is located between the flange and a base portion of the upper plate, and a lower metal plate is placed under the upper plate not to overlap the flanges and the shim member. The shim member is provided with an identification sign for identifying the thickness of the gasket and an assembly sign for identifying the orientation of the shim member at the connecting portion where the sealing ability is not affected, which can be seen from the back of the gasket after assembly. Therefore, when the shim member is assembled with the upper plate, the orientation of the shim member can be identified easily. Also, after assembly, the orientation of the shim member as well as the thickness of the gasket can be identified easily.

Abstract: A metal cylinder head gasket is formed of a metal plate extending substantially throughout an entire area to be sealed. The gasket includes a plurality of first holes for cylinder bores, a plurality of second holes for bolts, a plurality of beads formed in the metal plate to surround the first holes, and a plurality of slits formed in the metal plate to partly surround the beads between the second holes except for an intermediate area between the first holes. Each slit has narrow and wide areas. The narrow area has a width narrower than that of the wide area to adjust compressibility of the bead to thereby securely seal around the first holes.

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 metal plate, cylinder bore sealing devices formed on the metal plate for sealing around cylinder bores, and at least one water hole sealing device formed on the metal plate. The water hole sealing device has an inner sealing portion extending along and outside the cylinder bore sealing devices to have a space thereto and extending outside the water holes on a side of the cylinder bores, and an outer sealing portion situated outside the water holes and extending along the inner sealing portion. The inner and outer sealing portions surround a plurality of water holes therein, and continuously extend to join together to have at least one gas releasing portion between end portions of the water hole sealing device. Thus, even if the combustion gas leaks from the cylinder bores, the gas can be prevented from entering the water holes.

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 member. 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 gasket is formed of a gasket member extending substantially throughout an entire area to be sealed, a compressible sealing member, and a hard coating. The gasket member has a first hole to be sealed, and a plurality of second holes for allowing bolts to pass therethrough situated around the first hole. The compressible sealing member is disposed on at least one side of the gasket member to completely surround the first hole without surrounding the second holes. The hard coating is disposed on the gasket member at the same side of the sealing member to surround the second holes. The hard coating is formed independently from the compressible sealing member and has compressibility less than that of the compressible sealing member. The gasket can be formed easily at a low cost.

Abstract: A cylinder head gasket for an internal combustion engine is formed of a metal plate extending substantially throughout an entire area to be sealed. The metal plate has a plurality of holes corresponding to cylinder bores of the engine, a plurality of beads surrounding the respective holes, and at least one area situated between the holes adjacent to each other. Seal coatings are deposited above the beads in the area. The seal coating has heatproof characteristic and compressibility to strengthen surface pressure of the beads at the area.

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.

Abstract: 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 first 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 first metal plate. Thus, even if a foreign material is disposed on the bead, the sealing ability of the gasket is not substantially affected.

Abstract: A cylinder head gasket for an internal combustion engine is formed of a first metal plate and a second metal plate laminated together. The first and second metal plates have first and second beads laterally spaced apart from each other and facing each other. A resin layer is deposited on the first metal plate to extend continuously from an inner portion to an outer portion relative to the first bead such that the second bead is disposed on the resin layer. The resin layer securely seals between the first and second metal plates while providing compressibility.

Abstract: A metal gasket for an internal combustion engine is formed of a main gasket portion extending substantially throughout an entire area to be sealed. The main gasket portion is formed of at least one metal plate and has at least one hole to be sealed. A bore ring is disposed inside the at least one hole of the main gasket portion. The bore ring has a top portion and a bottom portion longer than the top portion to provide rigidity of the bore ring. The gasket can be properly fitted with the engine parts while protecting a bead formed on the metal plate to securely seal around the hole.

Abstract: A metal laminate gasket is installed in an internal combustion engine having at least one hole therein. The gasket includes a first metal plate, a second metal plate situated over the first metal plate, and an auxiliary sealing member. The first plate includes a base portion, a curved portion to define a first hole, and a flange extending from the curved portion. The flange, the curved portion and a part of the base portion constitute a main sealing portion without substantial elasticity. The second plate has a large second hole and is situated above the base portion of the first plate. The sealing member is situated in a space between an edge of the second hole and the flange. The main sealing portion non-resiliently seals around the hole, while the sealing member resiliently seals outside the main sealing portion, so that even if the engine is made of light metal, the engine is not damaged by the gasket. The gasket can securely seal around the hole.

Abstract: Engine gaskets for automobiles are fabricated from an as-quenched stainless steel having a martensitic-ferritic duplex-phase phase structure in which martensite comprises from 40% to 80%. The steel has a composition comprising on a weight basis; C+N: 0.1%-0.3%, Si: not greater than 0.5%, Mn: not greater than 0.7%, Cr: 10%-17%, and Ni: 0-0.6% and a Vickers hardness of from 300 to 500, The steel can be produced by quenching the steel after heating at 850-1000° C.

Abstract: A metal gasket is formed of a metal plate having a hole, an edge portion around the hole, and a base portion extending substantially throughout an entire area of the gasket and located outside the edge portion. At least one annular projection and at least one annular groove are formed on at least one side of the edge portion of the metal plate as one unit. The annular groove is located between the annular projection and the base portion. The base portion of the metal plate has a thickness greater than a thickness at the annular groove and less than a thickness at the annular projection to thereby provide a surface pressure at the at least one annular projection.