Abstract: A metal gasket has a primary bead formed on an area positioned between a cylinder bore and a cooling water passage. A second bead is formed on an area corresponding to an opening of one or more cooling passages. A base member of the metal gasket comprises bead plates that have a rubber coating layer. The base member also comprises a shim member disposed between the bead plates. The primary bead is formed by defining a space respectively between the bead plates and the shim member. The secondary bead is formed by defining a space on a given area between the bead plates.

Abstract: A metallic gasket including a base plate having a convex metal bead formed, by bending the base plate, between a combustion chamber opening and on the outer periphery portion of the base plate, and a first thickness-increased portion formed thicker than the remaining portions of the base plate to provide a difference in thickness, by which a surface pressure is made to concentrate on the first thickness-increased portion to seal a joint between a cylinder head and a cylinder block when the metallic gasket is disposed between the joint surfaces of the cylinder head and the cylinder block and fastened by clamping bolts. An elastic sealing material is fixed to the convex portion of the metal bead and filled in a concave portion on the reverse side of the base plate to form a rubber bead, and the sealing material is deformed under compression in the through-thickness direction in cooperation with the deformation of the metal bead when the gasket is fastened with clamping bolts.

Abstract: Provided is a connecting structure in which it is difficult for a crack to occur, even if a connection location is set in a portion on which concentrated tensile stress may occur. Laminated metal plates are concurrently punched out downward in shape of tongue piece. A depth of punch-out is not smaller than a total thickness of the laminated metal plates. A tongue piece portion is punched out in shape of cantilever beam while a central connection portion is left behind. The tongue piece portion is bent downward in the out-of-plane direction at a connection portion linking to the central connection portion in order that a location of the tongue piece portion in the extension direction on its way is parallel to a bend line. The tongue piece portion is configured to widen in width gradually toward a front end thereof.

Abstract: A metal gasket has a primary bead formed on an area positioned between a cylinder bore and a cooling water passage. A second bead is formed on an area corresponding to an opening of one or more cooling passages. A base member of the metal gasket comprises bead plates that have a rubber coating layer. The base member also comprises a shim member disposed between the bead plates. The primary bead is formed by defining a space respectively between the bead plates and the shim member. The secondary bead is formed by defining a space on a given area between the bead plates.

Abstract: A gasket which can uniformize the facial pressure on the thickened part more securely is to be provided. A gasket comprises a pair of base plates and stacked above and underneath, in which combustion chamber holes and bolt holes are bored, a doubling plate and shim plates intervene between these base plates. On this doubling plate, a second bead, which permits plastic deformation, extends in the circumferential direction of each combustion chamber hole. As the second bead is deformed according to the magnitude of the fastening load, the gasket height lowers where the fastening load is heavy and the facial pressure on the peripheries of combustion chamber holes is uniformized after fastening.

Abstract: A gasket which can secure a sufficient sealing capability even for compact, light and less rigid high-performance engines is to be provided. The gasket comprises a metallic base plate and a shim plate stacked around each of combustion chamber holes in the base plate. A base plate bead consisting of a full bead is formed along the circumference of each of the combustion chamber holes. The shim plate is large enough to be arranged opposite a first flat part, a base plate bead formation position A and a second flat part in the base plate. A plurality of strips of auxiliary beads are formed in the part of the shim plate opposite the base plate.

Abstract: Provided is a connecting structure in which it is difficult for a crack to occur, even if a connection location is set in a portion on which concentrated tensile stress may occur. Laminated metal plates are concurrently punched out downward in shape of tongue piece. A depth of punch-out is not smaller than a total thickness of the laminated metal plates. A tongue piece portion is punched out in shape of cantilever beam while a central connection portion is left behind. The tongue piece portion is bent downward in the out-of-plane direction at a connection portion linking to the central connection portion in order that a location of the tongue piece portion in the extension direction on its way is parallel to a bend line. The tongue piece portion is configured to widen in width gradually toward a front end thereof.

Abstract: A metallic gasket including a base plate having a convex metal bead formed, by bending the base plate, between a combustion chamber opening and on the outer periphery portion of the base plate, and a first thickness-increased portion formed thicker than the remaining portions of the base plate to provide a difference in thickness, by which a surface pressure is made to concentrate on the first thickness-increased portion to seal a joint between a cylinder head and a cylinder block when the metallic gasket is disposed between the joint surfaces of the cylinder head and the cylinder block and fastened by clamping bolts. An elastic sealing material is fixed to the convex portion of the metal bead and filled in a concave portion on the reverse side of the base plate to form a rubber bead, and the sealing material is deformed under compression in the through-thickness direction in cooperation with the deformation of the metal bead when the gasket is fastened with clamping bolts.

Abstract: A metallic gasket including a base plate having a convex metal bead formed, by bending the base plate, between a combustion chamber opening and on the outer periphery portion of the base plate, and a first thickness-increased portion formed thicker than the remaining portions of the base plate to provide a difference in thickness, by which a surface pressure is made to concentrate on the first thickness-increased portion to seal a joint between a cylinder head and a cylinder block when the metallic gasket is disposed between the joint surfaces of the cylinder head and the cylinder block and fastened by clamping bolts. An elastic sealing material is fixed to the convex portion of the metal bead and filled in a concave portion on the reverse side of the base plate to form a rubber bead, and the sealing material is deformed under compression in the through-thickness direction in cooperation with the deformation of the metal bead when the gasket is fastened with clamping bolts.

Abstract: A metal gasket has a primary bead formed on an area positioned between a cylinder bore and a cooling water passage. A second bead is formed on an area corresponding to an opening of one or more cooling passages. A base member of the metal gasket comprises bead plates that have a rubber coating layer. The base member also comprises a shim member disposed between the bead plates. The primary bead is formed by defining a space respectively between the bead plates and the shim member. The secondary bead is formed by defining a space on a given area between the bead plates.

Abstract: A gasket which can secure a sufficient sealing capability even for compact, light and less rigid high-performance engines is to be provided. The gasket comprises a metallic base plate and a shim plate stacked around each of combustion chamber holes in the base plate. A base plate bead consisting of a full bead is formed along the circumference of each of the combustion chamber holes. The shim plate is large enough to be arranged opposite a first flat part, a base plate bead formation position A and a second flat part in the base plate. A plurality of strips of auxiliary beads are formed in the part of the shim plate opposite the base plate.

Abstract: A gasket which can uniformize the facial pressure on the thickened part more securely is to be provided. A gasket comprises a pair of base plates and stacked above and underneath, in which combustion chamber holes and bolt holes are bored, a doubling plate and shim plates intervene between these base plates. On this doubling plate, a second bead, which permits plastic deformation, extends in the circumferential direction of each combustion chamber hole. As the second bead is deformed according to the magnitude of the fastening load, the gasket height lowers where the fastening load is heavy and the facial pressure on the peripheries of combustion chamber holes is uniformized after fastening.

Abstract: A metallic gasket having a first seal line SL1 arranged in a manner to encircle the peripheral edge of an exhaust gas hole 3, a second seal line SL2 arranged along the outer peripheral edge of a base plate 2, and full beads 6, 7 formed each in a convex cross-section by bending the base plate 2 along both seal lines. Elastic sealing material 8 to 11, the height of which is substantially equal to the height of a convex portion of the beads, are fixed to the convex portion and a flat surface continuous to the convex portion. The elastic sealing material on the flat surface is so arranged as to cover up to the opening mouth position of the exhaust gas hole 3 or a peripheral edge position of the base plate 2 and, furthermore, elastic material parts 12, 13 are filled in a concave portion of the bead on the reverse side of the convex portion. This structure of the gasket leads to cost reduction and enables the gasket to maintain a stable sealing performance for a long period of time.

Abstract: A metallic gasket comprising a base plate having a first thickness-increased portion 3 formed at a peripheral edge on a combustion chamber opening 3 side of a base plate, and a first seal line SL1 and a second seal line SL2 arranged on the outer side of said first thickness-increased portion 3. No openings other than a cooling water hole 8 exist between said two seal lines. Beads formed along said seal lines SL1 and SL2 each consist of a convex metal bead raised only upward from an upper surface of said base plate and a rubber bead made of an elastic sealing material fixed to a convex portion and a concave portion of said metal bead. This structure of said metallic gasket can improve a processing accuracy of said metal bead and also enhance cooling effects on said metallic gasket itself and said joint surfaces of an engine, between which said metallic gasket is disposed.

Abstract: A metallic gasket including a base plate having a convex metal bead formed, by bending the base plate, between a combustion chamber opening and on the outer periphery portion of the base plate, and a first thickness-increased portion formed thicker than the remaining portions of the base plate to provide a difference in thickness, by which a surface pressure is made to concentrate on the first thickness-increased portion to seal a joint between a cylinder head and a cylinder block when the metallic gasket is disposed between the joint surfaces of the cylinder head and the cylinder block and fastened by clamping bolts. An elastic sealing material is fixed to the convex portion of the metal bead and filled in a concave portion on the reverse side of the base plate to form a rubber bead, and the sealing material is deformed under compression in the through-thickness direction in cooperation with the deformation of the metal bead when the gasket is fastened with clamping bolts.

Abstract: A metallic gasket including a base plate having a convex metal bead formed, by bending the base plate, between a combustion chamber opening and on the outer periphery portion of the base plate, and a first thickness-increased portion formed thicker than the remaining portions of the base plate to provide a difference in thickness, by which a surface pressure is made to concentrate on the first thickness-increased portion to seal a joint between a cylinder head and a cylinder block when the metallic gasket is disposed between the joint surfaces of the cylinder head and the cylinder block and fastened by clamping bolts. An elastic sealing material is fixed to the convex portion of the metal bead and filled in a concave portion on the reverse side of the base plate to form a rubber bead, and the sealing material is deformed under compression in the through-thickness direction in cooperation with the deformation of the metal bead when the gasket is fastened with clamping bolts.

Abstract: A metallic gasket capable of providing a sufficient sealing capability all around a combustion chamber hole and avoiding such problems that the step of a cylinder block supporting the lower end part of a cast-iron sleeve is damaged by the thermal expansion of the sleeve during the operation, the roundness of a bore is impaired, the cast-iron sleeve is sunk, and a pressure leaks between the fastening bolts, wherein the end part of a shim plate (14) on a combustion chamber hole (12) side is disposed on the upper end surface of the cast-iron sleeve (2) radially outside the outer peripheral position (OL1), the end part of the shim plate (14) more distant from the combustion chamber hole (12) is disposed on the combustion chamber hole (12) side from an outside line (OL2) of the water jacket (4) formed in the cylinder block (1), and a part of a full bead (13) is disposed on the upper end surface of the cast-iron sleeve (2).

Abstract: In a method for connecting laminated metal plates comprising the steps of forming a plurality of cutting lines independent from each other in a laminated metal plate, and forming a projecting portion by making a metal plate between the cutting line protrude in a laminating direction by a step that is higher than the thickness of the laminated plate, the following solutions are adopted with a view to preventing securely the dislocation of the metal plates in the laminating direction and also preventing securely the deviation of the metal plate in every direction in the laminated plate surface by the two cutting lines.

Abstract: An edge of a cylinder bore hole of a base plate is folded back on the base plate to form a double-layer folded portion, and a soft member is held in the inside of the folded portion. Folded portions are also formed by folding an outer peripheral edge of the base plate at positions along a straight line which passes through center points of bolt holes which are located at each side of a reference line passing through center points of cylinder bore holes. The straight line is parallel with the reference line. Further folded portions are formed by folding the outer peripheral edge of the base plate at positions along a further straight line which passes through center points of bolt holes which are located at both sides of the reference line so that the further straight line is orthogonal to the the reference line. Rubber beads made of silicon rubber are formed on both joining surfaces of the base plate to bound each of the cylinder bore holes and the bolt holes.

Abstract: In a metallic gasket in which a plate member having at least one flexible metal plate has a hole, a flat portion formed at the periphery of the hole and a bead disposed concentrically with the hole to the outside of the flat portion is sandwiched between joining faces, an annular stopper is secured to the plate member at a position corresponding to the flat portion on the side of the hole. The stopper is made of a metal material different from the plate member and formed to an increased thickness at a portion for a larger gap, and formed to a decreased thickness at a portion for a smaller gap depending on the difference of the size of the gap between the joining faces.