Abstract: A combustion seal for sealing high pressure combustion gas within at least one cylinder of an internal combustion engine including a cylinder block, a cylinder head having a groove formed in its bottom face, a cylinder liner having a complementary groove formed in its top face, and a O-ring formed from a ductile material and positioned between and contacting each edge of the groove formed in the cylinder head and the complementary groove formed in the cylinder liner, wherein the O-ring is compressed when the cylinder head is secured on the cylinder such that the O-ring has multiple radial restraint points of contact with the edges. When securing the cylinder head onto the cylinder block, the O-ring is positioned between the grooves in the cylinder head and cylinder liner before a compressive force is applied.

Abstract: A metal gasket in which a thin metal plate for reinforcing the beads of an elastic metal plate is laminated on bead regions only of the elastic metal plate, whereby a stable sealing performance is secured for a long period of time. This metal gasket comprises a thin metal plate provided with beads extending around the circumferences of parallel arranged combustion chamber holes, and an elastic metal plate having combustion chamber holes and extending with a predetermined width and laminated on the portions of the thin metal plate which are around the combustion chamber holes so as to be opposed to valley portions of the beads. The thickness of the thin metal plate is set smaller than that of the elastic metal plate.

Abstract: A metal laminate gasket of the invention is used for an internal combustion engine having a sealing hole and a plurality of bolt holes situated around the sealing hole. The gasket is formed of first and second metal plates having holes corresponding to the sealing hole and the bolt holes of the engine. The second metal plate includes a base portion, a curved portion extending from the base portion to define one hole therein and located inside one hole in the first plate, and a flange extending from the curved portion and disposed over the first plate. The flange has a plurality of wide flange portions and narrow flange portions alternately arranged to each other such that the wide flange portions are located near the bolt holes to support high tightening pressures applied thereto. A bead may be formed on one or both of the first and second plates outside the flange. The bead may have wide and narrow portions to provide equal surface pressures as a whole.

Abstract: A system for sealing a wellhead, the system comprising: a wellhead housing for connecting to a well string casing, the wellhead housing being annularly disposed about a central axis comprising: a primary sealing surface disposed within the wellhead housing; a reference surface extending below the primary sealing surface; and a secondary sealing surface extending below the reference surface; a wellhead connector annularly disposed about the central axis having disposed therein a connector sealing surface; and a secondary seal ring annularly disposed about the central axis and comprising: a ring seal surface for sealing contact with the connector sealing surface; and an extension extending below the ring seal surface and having disposed thereon a sealing land extending from a lower portion of the extension for sealing contact with the wellhead housing.

Abstract: An inventive multi-layered cylinder head gasket includes a metallic base plate with an inner peripheral edge spaced radially outwardly from a cylinder bore opening and a metallic compensating plate thicker than the base plate. The base plate includes a stopper section comprising an integral flange folded about an inner peripheral edge of the compensating plate and terminating at a free edge adjacent the inner peripheral edge of the base plate.

Abstract: A metal gasket of the invention is used for a cylinder head gasket or a pipe connecting gasket. The gasket is basically formed of a single metal plate having a base portion extending substantially throughout an entire area to be sealed, and includes a bead protecting portion extending outwardly from the front surface and a sealing bead adjacent to the bead protecting portion. The bead protecting portion and the sealing bead are formed in the metal plate. The bead protecting portion has no substantial compressibility, but the sealing bead has a compressibility. Thus, when the metal plate is compressed, the bead protecting portion provides a surface pressure without substantial resiliency, and the sealing bead provides a surface pressure with resiliency and is protected from being completely compressed by the bead protecting portion. The gasket can be made thin.

Abstract: A metal gasket is composed of a plurality of metal sheets superimposed one above the other and including a plurality of joints. Each of the joints includes a plurality of cut lines defining inner side edges of the metal sheets, and a bent portion located between the cut lines and having outer side edges which are frictionally engaged with the inner side edges of the metal sheets. The joints are oriented in different directions to accommodate a shear force.

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 laminated with each other, and a metal ring. The first plate includes a base portion, a curved portion extending from the base portion to define a first opening, a flange extending from the curved portion and located under the base portion, and second openings corresponding to bolt holes of the engine. The second metal plate is situated under the base portion, and includes a third opening greater than the first opening and fourth openings situated under the second openings. The metal ring is situated between the flange and the base portion, and includes narrow portions and wide portions alternately arranged to each other. The wide portions are located close to the bolt holes. Thus, high tightening pressures when bolts disposed in the bolt holes are tightened are supported at the wide portions.

Abstract: A metallic cylinder head gasket with a pair of deformation limiters for protecting each sealing bead which circumscribes a gasket opening aligned with an engine cylinder. The gasket has at least a first cover plate, which includes the resilient beads, a shim and a ring member. The edge of the combination chamber aligned opening in the shim is displaced radially outwardly from the associated bead, and the bead is thus not aligned with the shim, and a ring member overlaps the shim in an annular region adjacent the edge of the opening in the shim to define an outer deformation limiter. The ring member extends radially inward to the edge of the gasket opening and has a region of increased thickness which defines the inner deformation limiter.

Abstract: A gasket having a bore (2), a base plate (1) having a flat reference plane (1a), and a stepwise half bead structure integrally formed at least on one side of the flat reference plane (1a) of the base plate (1), wherein the half bead structure has half beads (4A, 4B) of two or more steps.

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 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 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: This metal gasket comprises a beaded base plate, an intermediate plate and a thin plate, and secures a stable long-standing sealing performance with a face-to-face pressure balance kept properly. This metal gasket is provided with full beads on the beaded base plate, stopper beads on the intermediate plate, and folded portions, which hold the edge portions of bores of the intermediate plate, and full beads, which are laminated on the stopper beads on the intermediate plate, on the thin plate. The folded portions are formed so that they are not laminated on the stopper beads when the metal gasket is in practical use, i.e., when the folded portions are in a compressed condition. The folded portions and stopper beads display a stopper function of preventing the full compression of the full beads on the beaded base plate, and a sealing function of preventing the entry of a combustion gas into the clearances defined by the full beads.

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 metallic cylinder head gasket for an internal combustion engine having cylinder liners, the gasket comprising at least one cover plate which has a plurality of openings, commensurate with the combustion chambers of an internal combustion engine. The gasket has beads which extend around the openings, the beads being arranged at a distance from the edges of the openings. An annular upward extension is arranged concentrically with respect to each bead and serves as an upward extension of the combustion space and as a deformation limiter for the bead. The gasket is provided with at least one flat carrier plate. The upward extensions are formed by rings which are supported by the liner collars.

Abstract: A metallic cylinder head gasket for an internal combustion engine comprises a carrier plate sandwiched between flat cover plates, the multi-layer structure having a pattern of openings as dictated by the arrangement of engine cylinders, head mounting bolts and fluid flow passages. Resilient beads which cooperate with the carrier plate to form ring seals are formed in the cover plates and are arranged coaxially with respect to the apertures in the gasket. The beads are offset radially outwardly from the edges of the apertures and a deformation limiter is provided between each bead and the edge of the coaxial aperture, the deformation limiters being in the form of either a pair of oppositely directed, generally trapezoidal shaped deformable beads in the support plate or a single such trapezoidal shaped bead and a cooperating ring member which covers the concave side of the bead.

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: This metal gasket comprises a bead base plate with first beads and a sub-plate stacked on the bead base plate. The sub-plate is made of a thick metal plate and formed with second and third beads and stepped portions. The second beads, the third beads and the stepped portions combine to form triple seal lines, which improve the sealing function. The sub-plate is formed with the second beads opposing the first beads of the bead base plate, with the high third beads formed inside the second beads around the holes and with the stepped portions formed outside the second beads around the holes. The third beads prevent ingress of burning gases to the first beads and also serve as a stopper to prevent the first beads from being flattened completely. The third beads therefore can add durability to the sealing function realized by the first and second beads, enhancing the sealing performance of the first and second beads and reliably preventing burning gases from escaping between the opposing surfaces.

Abstract: The present invention comprises a pair of bead plates on which beads are formed, and an intermediate plate on which first and second stepped portions are formed. One of the bead plates is provided with auxiliary beads so as to prevent a full compression of the beads and increase the sealability. This metal gasket comprises first and second bead plates having beads and extending along the circumferences of holes, and an intermediate plate interposed between the bead plates. The intermediate plate is provided in the regions thereof which extend along the circumferences of the holes and on the inner side of the beads with first stepped portions extending toward the first bead plate, and second stepped portions extending toward the second bead plate. The second bead plate is provided with auxiliary beads extending toward the second stepped portions.

Abstract: The invention is directed to a metal gasket for sealing a clearance between a pair of clamping members. The metal gasket is formed of a metallic base plate on which at least one opening is defined. An annular metallic shim is welded on the base plate around the opening thereof. The annular metallic shim is disposed around the opening, and welded on the base plate by spot welding, forming a plurality of nuggets in series around the shim in such a manner that two adjacent nuggets overlaps each other and a space between those two nuggets is smaller than a diameter of each nugget.