Abstract: A protecting member of the invention is used for a gasket situated between two engine parts. The protecting member includes a spring member situated between the two engine parts and located around bolt. When the bolt is tightened, the spring member abuts against the engine parts and is compressed to provide predetermined pressure to the bolt through the engine parts. Thus, when an outward force applied to the bolt increase, an amount of the outward force exceeding the predetermined pressure, i.e. the tightening pressure, is only applied to the bolt to absorb a part of the outward force. When an inward force applied to the bolt decreases, the predetermined pressure of the spring member acts against the inward force applied to the bolt. Thus, the pressure changes to the gasket is reduced to prevent creep relaxation of sealing means of the gasket.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine. The gasket is basically formed of first and second metal plates piled together, and includes a cylindrical portion integrally formed on the first metal plate with a first hole, and a second hole formed in the second plate. The cylindrical portion extends substantially perpendicularly to the first plate, and has an axial length along the inner periphery at least equal to the thickness of the gasket. The second hole has a diameter greater than an outer diameter of the cylindrical portion. When the gasket is assembled, after the cylindrical portion is inserted into the second hole, the cylindrical portion is enlarged to press fit against the inner periphery of the second hole. Thus, the first and second metal plates are firmly connected together without portions extending outwardly from outer surfaces of the gasket.

Abstract: A metal laminate gasket of the invention is basically formed of first and second metal plates laminating together, and a plurality of fixing devices for connecting the first and second metal plates. The fixing devices are formed inside the gasket at the portions where sealing ability of the gasket is not affected. Each fixing device is formed of a hole formed in the first plate and a bending strip formed in the second plate. The bending strip is located under the hole of the first plate and is formed by partly cutting the second plate. When the first and second plates are assembled, the bending strip extends through the hole of the first plate and is located above the first plate.

Abstract: The metal gasket of the invention is installed in an internal combustion engine. The engine includes at least one cylinder bore, a plurality of bolt holes and at least one fluid hole. The gasket is basically formed of a metal plate and includes holes corresponding to the holes of the engine. The gasket includes a bead for sealing around the fluid hole, to which different tightening pressure is proportionally applied when the gasket is tightened. The bead includes at least one first portion where high tightening pressure is applied, and at least one second portion where moderate tightening pressure is applied. The second portion has spring constant less than that of the first portion. When the gasket is tightened, the bead is compressed according to the tightening pressure applied thereto to thereby properly seal around the fluid hole.

Abstract: A gasket of the invention is attached to an engine part for installing the gasket between the engine parts. The gasket is formed of a metal plate for constituting at least a part of the gasket, and at least two auxiliary attaching devices connected to the metal plate. The auxiliary attaching devices project outwardly from the metal plate. When the gasket is disposed on the engine part for attachment thereof, the auxiliary attaching devices are located adjacent to the engine part and hold the engine part to locate the gasket on the engine part.

Abstract: A metal plate for a gasket is provided with a plurality of beads around portions to be sealed. The beads intersect together to form an intersecting portion, which has an outer edge to surround the intersecting portion, a center portion in the center thereof, and a surrounding portion situated between the center portion and the outer edge. A cutting portion penetrating through the plate is formed at the center portion. When the metal plate is tightened, the cutting portion operates to disperse stress applied to the center portion of the intersecting portion. Therefore, equal surface pressure is formed on the intersecting portion as well as the beads.

Abstract: A metal gasket of the invention is designed to reduce heat transfer between two engine parts. The gasket is formed of at least two plates having holes to be sealed and bolt holes, a sealing device formed around the hole to be sealed, and a space forming device formed on at least one of the plates to separate the plates apart. Spacers are formed around the bolt holes so that bolts can be tightened up to a predetermined thickness. When the gasket is tightened, the sealing device is compressed to seal around the hole, but the two meal plates do not closely abut against each other by means of the space forming device. Accordingly, heat is partly radiated through the gasket, and heat transmission between the engine parts is reduced.

Abstract: A cylinder head gasket of the invention is formed of a main plate extending substantially throughout the entire area of the gasket, sealing devices formed around the cylinder bores, and at least one auxiliary plate laminated over the main plate. The auxiliary plate is situated at least in an intermediate area of the main plate surrounded between the two adjacent holes corresponding to the cylinder bores. The auxiliary plate includes two edge portions extending at least partly along the cylinder bores adjacent the intermediate area, a base portion between the two edge portions, and two turning portions laminated over the respective edge portions. When the gasket is tightened, the edge portions and the turning portions provide high surface pressure around the cylinder bores. Accordingly, leakage of gas at the intermediate area is prevented.

Abstract: A steel laminate gasket comprises first, second and third plates. The gasket is provided with a first sealing device for sealing around a cylinder hole, which is integrally formed with one of the first, second and third plates, .a second sealing device situated inside the first sealing device, and a third sealing device for sealing around a through hole of an engine. The third sealing device is formed on at least one of the first, second and third plates. Sealing layers are provided between the plates outside the second sealing device relative to the cylinder hole.

Abstract: A metal laminate gasket of the invention is basically formed of first and second metal plates, and a sealing device situated around the cylinder bores. The first plate includes first holes corresponding to the cylinder bores, an intermediate area located between the first holes, and two openings situated at the intermediate area. The second plate is situated above the first plate, and includes a second hole for locating therein the first holes and the sealing device. The second plate includes projecting areas with edges located on the intermediate area. When the first and second plates are assembled, the edges of the second plate pass through the openings of the first plate and are located at a side opposite to a side that the second plate is disposed. Thus, the edges of the second plate are fixed to or engaged with the first plate.

Abstract: A steel laminate gasket of the present invention is installed between two engine parts having at least one fluid hole. The gasket comprises a first plate having at least one first hole, a second plate situated above the first plate and having at least one second hole, at least one third plate situated above the second plate and having at least one third hole, and a cover member for covering at least first and third holes. The size of the first hole is smaller than the fluid hole of the engine parts to restrict flow rate of fluid passing therethrough. The second plate is provided with a first sealing device situated around the fluid hole such that the first sealing device is sandwiched between the two engine parts. The size of the second hole is smaller than the first sealing device. The size of the third hole is substantially the same as that of the first hole. The third plate is provided with a stepped portion, which is located inside the first sealing device when the plates are assembled together.

Abstract: The metal laminate gasket of the invention is used for an internal combustion engine having a hole to be sealed. The gasket is formed of a plurality of metal plates for constituting the metal laminate gasket, and a device for defining the hole of the engine with a curved portion and a flange. Inside the curved portion around the hole, a wire ring, at least one bead and a hollow ring are situated. The hollow ring is arranged between the curved portion and the bead. The thickness of a metal plate for the hollow ring is adjusted so that the surface pressures on the wire ring and the bead are regulated by the hollow ring when the gasket is tightened.

Abstract: A cylinder head gasket prepared by a method of the invention is installed between a cylinder head and a cylinder block. In the method, a plate is prepared at first to have at least one hole smaller than a hole of the engine to be sealed. The first plate is bent around the first hole so that the first plate is provided with a curved portion defining a hole corresponding to the hole of the engine, a flange extending away from the curved portion, and a space around the curved portion. The curved portion is compressed to eliminate the space to thereby form a solid portion by the flange and an annular portion. A second plate having a hole larger than the flange is prepared and is assembled with the first plate. The second plate is located at a side opposite to the flange of the first plate. The second plate does not laminate the flange of the first plate.

Abstract: A gasket of the invention is installed between two engine parts of an internal combustion engine. The gasket may be formed of one metal plate including at least one first hole, at least one sealing device formed around the first hole, and a plurality of bolt holes for attaching the gasket to the engine. The metal plate further includes at least one second hole situated adjacent to the first hole between the two bolt holes, and a bead around the second hole. The second hole is arranged such that a substantial portion of the second hole is located outside an imaginary line linking between centers of the two bolt holes adjacent to each other. The bead includes an inner section near the first hole having spring constant weaker than a remainder of the bead. Therefore, when the metal plate is tightened between the engine parts, the bead can be compressed equally to securely seal around the second hole. The metal plate may be combined with other metal plates to constitute a steel laminate gasket.

Abstract: The steel laminate gasket is installed between two engine parts. One of the engine parts is provided with at least two positioning pins for setting a location of the gasket. The gasket comprises at least first and second plates. The first plate includes at least first and second holes formed at portions corresponding to the positioning pins, and a plurality of slits formed at an inner portion around the first hole. The diameter of the first hole is at least partly smaller than the diameter of the positioning pin. The second plate is situated above the first plate and is connected thereto. The second plate includes third and fourth holes corresponding to the first and second holes, respectively. The third hole is larger than the first hole. When the gasket is pushed over the positioning pins, the inner portion around the first hole bends and engages the positioning pin to securely connect the gasket to the engine block.

Abstract: A metal laminate type cylinder head gasket is installed in an engine having a cylinder block with a cylinder bore, a cylinder head with an auxiliary combustion chamber, and a mouth plate attached to the cylinder head. The gasket is basically formed of first and second plates laminating together, and a sealing device around the cylinder bore. The second plate is situated under the first plate and includes first and second beads. The first bead extends at least partly around the cylinder bore, and the second bead is located adjacent to and at a predetermined distance outwardly away from a part of a contour of the mouth plate. The second bead intersects the first bead at intersecting portions and includes a wide portion having a width wider than that of the intersecting portion. The tightening pressure applied to the second bead is concentrated at the intersection portions.

Abstract: A steel laminate gasket comprises first, second and third plates. The gasket is provided with a first sealing device for sealing around a cylinder hole, which is integrally formed with one of the first, second and third plates, a second sealing device situated inside the first sealing device, and a third sealing device for sealing around a through hole of an engine. The third sealing device is formed on at least one of the first, second and third plates. Sealing layers are provided between the plates outside the second sealing device relative to the cylinder hole.

Abstract: A steel laminate gasket of the invention is installed in an internal combustion engine having at least one hole therein. The gasket comprises a first metal plate, and a second metal plate situated under the first metal plate. The first plate includes a first sealing device around a first hole to be sealed, and an embossed portion between the first sealing device and a base portion of the first plate. The second plate has a second hole larger than the first sealing device, and a second sealing device around the second hole. When the first and second plates are assembled, the second plate does not pile the first sealing device. The gasket is securely sealed by the combination of the first and second sealing devices and the embossed portion.

Abstract: A steel laminate gasket is used for an internal combustion engine having at least one hole therein. The gasket comprises a main plate, and at least one pressure regulation plate. The main plate includes a base section having at least one first opening corresponding to the hole of the engine, a flange situated over the base section around the first opening, and a curved portion situated between the flange and the base section adjacent to the first opening. The curved portion has resiliency to seal around the first opening when the gasket is tightened. The base section, flange and curved portion are integrally formed together. The pressure regulation plate is placed over the base section and includes at least one second opening. The diameter of the second opening is larger than the diameter of the flange so that the pressure reglation plate can be directly placed over the base section without laying over the flange.

Abstract: A metal gasket of the invention is designed to reduce heat transfer between two engine parts. The gasket is formed of at least two plates having holes to be sealed and bolt holes, a sealing device formed around the hole to be sealed, and a space forming device formed on at least one of the plates to separate the plates apart. Spacers are formed around the bolt holes so that bolts can be tightened up to a predetermined thickness. When the gasket is tightened, the sealing device is compressed to seal around the hole, but the two meal plates do not closely abut against each other by means of the space forming device. Accordingly, heat is partly radiated through the gasket, and heat transmission between the engine parts is reduced.