Abstract: The present invention relates to a gasket, particularly a cylinder head gasket, comprising an edge-to-edge stopper. More particularly, the present invention relates to a multisheet cylinder head gasket comprising at least two sheets of which at least one is ribbed.

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: Cylinder head gasket which has at least on one side elevations which form gasket sealing surfaces, which surround at least one aperture of the cylinder head gasket in an enclosed manner, for pressing against at least one engine component sealing surface and the height profile of which is designed prior to the installation of the cylinder head gasket to correspond at least approximately to the topography of the sealing gap to be sealed and resulting when a cylinder head gasket is installed, the respective combustion chamber openings of the cylinder head gasket being encircled by these elevations individually, wherein the elevations are formed by at least one basic member provided with a coating, the material of the basic member being selected in such a manner and its cross section being configured in such a manner that the basic member is not deformable in height at least in first sections of the gasket sealing surfaces under the maximum load occurring during the installation of the cylinder head gasket as wel

Abstract: A method for joining at least two metallic sheets superposed to form a stack, at least one of which bears an electrically insulating coating on at least one face. The method particularly is for producing multisheet gaskets, characterized in that the method consists of placing the stack of sheets between an anvil and a sonotrode, applying a given pressure to the stack, and while applying the pressure, emitting an ultrasonic wave to cause localized melting of the metal constituting the sheets opposite the sonotrode.

Abstract: A metal gasket with a hole to be sealed includes first and second metal base plates laminated together. The first metal base plate has a first main bead around the hole, and a first outer sub-bead section smaller than the first main bead and provided outside the first main bead. The second metal base plate has a second main bead around the hole, and a second outer sub-bead section smaller than the second main bead and provided outside the second main bead. The second outer sub-bead section abuts against the first outer sub-bead section for sealing.

Abstract: A seal for a flange includes two separate sealing lips to seal the interfaces between the flange and the intake manifold and the cylinder head. One lip seals against the head surface when the flange is bolted to the cylinder head. The other lip seals around the intake manifold when the intake manifold, such as a tubular intake manifold, is inserted into the flange. The flange seal is made of elastomeric material, such as rubber, and is integrally bonded to the flange made of metal, such as steel or aluminum, during the molding process to form a flange seal having a one-piece construction. The flange seal also includes a gap between one of the sealing lips and an outer surface of the flange that provides a space for the displaced rubber to flow when compressed by the cylinder head. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

Abstract: An encoder-equipped sealing device (1) that includes two seal members (5, 15) arranged to face opposite each other and each having a reinforcing ring (4, 14) with an L-shaped cross section, each of the reinforcing rings (4, 14) having a cylindrical portion (2,12) and a flanged portion (3, 13) extending from one end of the cylindrical portion (2, 12) in the direction perpendicular to the cylindrical portion (2, 12). Seal member (15) includes an elastic seal (6) formed in such a manner as to be supported by the reinforcing ring (14) of said seal member (15), the elastic seal (6) extending toward the other seal member (5) such that a seal portion (7, 8, 9) is formed between the elastic seal (6) and said other seal member (5). Seal member (5) includes an encoder (10) on the side of the flanged portion (3) of said seal member (5) that is opposite the side facing the other seal member (15).

Abstract: An improved exhaust pipe flange ring gasket is principally defined by a pair of mating exhaust pipe flanges. One of the flanges has an annular groove extending in the one of the mating flanges. One or more metal Belleville spring washers or wave spring washers are wrapped within a stainless cover to define a hoop-style spring ring disposed within the groove. The metal washer replaces a traditional spiral wound core or graphite filler that tends to oxidize at high operating temperatures; such oxidation adversely affects sealing performance. Conversely, the washer, which can be either a Belleville or wave spring, is comprised of a hard stainless steel that will not oxidize at high operating temperatures. Gasket sealing performance is vastly improved, even though the Belleville or wave spring washer is relatively inexpensive. The Belleville or wave spring washer provides relatively stiff spring resilience to accommodate deflection along its axial compressive direction.

Abstract: A gasket material to be mounted on an engine of a vehicle, including: a metal plate; a film made from silica and a reaction product of an acid component and metal or a metallic compound; and a rubber layer formed on at least one of opposite surfaces of the metal plate through the film.

Abstract: Flat seal, in particular cylinder head seal, for combustion engines is disclosed having at least one metal layer, in which at least one which pass-through opening is made. An outer sealing function is achieved by provision of several circumferential, parallel profile sumps of selectable shape in the area near the outer edge of the metal layer.

Abstract: The invention relates to the application of a projection to a metal layer of a metallic cylinder-head gasket for an internal-combustion engine having at least one elastic metal sheet, which is provided with one opening or a plurality of adjacent openings depending on the number of combustion chambers of the internal-combustion engine, a bead being provided in the at least one elastic metal sheet around each opening, at a distance from the latter, so that a straight section of sheet metal is left clear in the region of the edge of the opening, for which bead a spring travel limiter or stopper, which runs coaxially with respect to the bead and is formed by the projection, is provided, the projection being produced from a mixture which contains a plastic with a high mineral filler content. A mixture of an elastomer in particular with a filler which has been surface-treated by means of a silane is used.

Abstract: The present invention provides a combination metal gasket that is formed by fitting a ring-shaped metal base elastic structure in at least one trough portion of two trough portions of a ring-shaped metal gasket that has an S-shaped longitudinal cross section. The combination metal gasket does not demonstrate the plastic deformation even when a large compressive load is applied and is not likely to be destroyed even when a pressure of a fluid being sealed is high; that is, stable sealing properties are exhibited.

Abstract: A gasket for statically sealing between two members is disclosed. The gasket includes a first generally planar portion having an inner perimeter and an exterior perimeter, and having a first surface and a second surface on an opposite side from the first surface. A seal bead rises from the first surface a first predetermined height and extends about the inner perimeter. A fastener hole extends through the first portion and is located between the seal bead and the exterior perimeter. The gasket also includes a seal feature located between the fastener hole and the exterior perimeter that rises from the first surface a second predetermined height that is about equal to or greater than the first predetermined height.

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: The present invention relates to an improved primer coating for a multilayer gasket. The coating includes an elastomer, an epoxy resin and a particulate lubricant. The coating may also employ other components such as cure accelerators and reactive diluents. Also disclosed is a method of making the primer coating.

Abstract: Arrangement for the gas-tight fixing of an inlet manifold (1) with a connector flange to the cylinder head (2) of an internal combustion engine, with a sealing plate (3), arranged between the connector flange of the inlet manifold (1) and the cylinder head (2), in which at least one air passage (4, 5, 6, 7) for the at least one inlet tube of the inlet manifold (1) is embodied, with first connecting means (9) for connecting the sealing plate (3) to the inlet manifold (1), which are arranged in housings (10), in or on the sealing plate (3), with second connecting means for connecting the connector flange (1) and/or the sealing plate (3) to the cylinder head (2). A first sealing means (19) is provided on the sealing plate (3) on the one side (18) thereof, surrounding the at least one air passage (4, 5, 6, 7), for fitting to the inlet manifold (1), whereby at least one elastic element (13) is provided between the first connecting means (9) and the sealing plate (3).

Abstract: A sealing system for an internal-combustion engine is provided in which a lubricating-oil-carrying space particularly an oil catching space, is separated by wall elements from adjoining space sections, which wall elements have elastic sealing elements for sealing off the spaces. For the compensation of sealing gap tolerances, a sealing element is provided which has at least two sealing arms which come to rest on the space wall to be sealed off. Despite larger sealing gap tolerances, a secure oil-tight separation of spaces is thereby provided.

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: An improved combustion gasket is disclosed incorporating a self-energizing combustion seal flange. The flange includes at least one valley that serves to redistribute combustion explosion forces acted upon the gasket during operation of the engine to provide improved combustion sealing and to extend flange life.

Abstract: A flat gasket for a reciprocating engine or a driven machine includes at least two laminated metal sheets 0.05 to 0.5 mm thick which are provided with a coating of an elastomer film at least on the side facing outward and have an edge area, formed by the outer contour and/or at least one cylinder bore and/or a water and/or oil passage in the cylinder head, adjacent to at least one peripheral first bead of one of the metal sheets, the second metal sheet bridging the first bead, both metal sheets being joined together permanently on both sides of the first bead.

Abstract: An improved gasket (11) for sealing the joint between a pair of flange surfaces is provided. In one embodiment, the gasket (11) is an edge coated gasket and the edge coating (14) also exhibits surface adhesion to enhance the seal provided by the gasket. In another embodiment, compressible sealing members (34, 44) are coated with a coating material (37, 47) that exhibits surface adhesion properties.

Abstract: The present invention relates to an improved primer coating for a multilayer gasket. The coating includes an elastomer, an epoxy resin and a particulate lubricant. The coating may also employ other components such as cure accelerators and reactive diluents. Also disclosed is a method of making the primer coating.

Abstract: A metal cylinder head gasket includes a spacer plate; a sealing layer superposed on the spacer plate; an opening in the spacer plate and the sealing layer for surrounding a combustion chamber of an internal-combustion engine and a full bead provided in the sealing layer and surrounding the opening. The full bead has a crest, and first and second bead feet situated radially inward and, respectively, radially outward of the crest. An annular overlay surrounds the opening and is positioned between the spacer plate and the sealing layer and is in engagement with the full bead. The annular overlay has a radially inner edge face in alignment with the opening edges; and a radially outer edge face situated between the crest and the second bead foot. The sealing layer further has a half bead surrounding the full bead and being spaced radially outward from the second bead foot.

Abstract: A cylinder head gasket includes a metal base plate; a combustion chamber opening provided in the base plate; a metal overlay surrounding the opening; and a weld bonding the overlay to the base plate. The weld is composed of a plurality of weld dots lying in a single row and being equidistantly spaced from one another. Each weld dot has a first diameter on a surface of the base plate and a second diameter on a surface of the overlay. The first diameter is smaller than the second diameter, and a distance between center points of adjoining the weld dots is greater than the second diameter of either of the adjoining weld dots.

Abstract: The invention concerns a cylinder head gasket for sealing the region between cylinder head and a cylinder block having a cylinder liner of an internal combustion engine, comprised of at least one sealing sheet that has at least one combustion chamber passage opening and a combustion chamber crimp running around the combustion chamber passage opening, where a stop serving as a path limiter for the combustion chamber crimp is provided on the side of the combustion chamber crimp facing away from the combustion.chamber passage opening and which stop encloses the combustion chamber crimp laterally, where at least one sealing sheet has at least two concentric combustion chamber crimps, which are enclosed laterally by the stop.

Abstract: A gasket having a plurality of superposed windings of a profiled metal strip spirally wound upon itself around a central axis, a plurality of windings of a strip of graphite interposed between at least some of the superposed windings of the metal strip, and a solid ring of graphite on the O.D. Two or more of the radially intermost windings on the I.D. are in surface-to-surface contact with each other without interposed sealing material.

Abstract: The invention relates to the application of a projection to a metal layer of a metallic cylinder-head gasket for an internal-combustion engine having at least one elastic metal sheet, which is provided with one opening or a plurality of adjacent openings depending on the number of combustion chambers of the internal-combustion engine, a bead being provided in the at least one elastic metal sheet around each opening, at a distance from the latter, so that a straight section of sheet metal is left clear in the region of the edge of the opening, for which bead a spring travel limiter or stopper, which runs coaxially with respect to the bead and is formed by the projection, is provided, the projection being produced from a mixture which contains a plastic with a high mineral filler content. A mixture of an elastomer in particular with a filler which has been surface-treated by means of a silane is used.

Abstract: A cylinder head gasket is coated with an encapsulant that is mixed with a light color pigment to create a light colored encapsulant. A translucent topcoat is preferably coated over the encapsulant. The encapsulant is preferably an epoxy primer, the topcoat is preferably a silicone, and the pigment is preferably made from titanium dioxide or zinc oxide.

Abstract: A gasket with selectively positioned seal enhancement zones located in the web of the gasket is provided. The gasket is formed of a base sheet of gasket material cut to define an interior aperture bounded by an interior edge and webs. Slots are formed at selected locations within the seal enhancement zones and the slots are bounded by edges. An edge coating of polymeric material is applied to the slot edges and, in one embodiment, project beyond the facial planes of the base sheet to form raised rims. An edge coating also may be formed on the interior edge bounding the aperture of the gasket. When clamped between a pair of flange surfaces, the polymeric edge coatings on the slot edges engage and seal against the flange surfaces within the seal enhancement zones to provide an enhanced seal against leakage in these zones.

Abstract: A metal gasket used in an engine with a chain case, using a foam-rubber seal member shaped to withstand in practical use and having excellent long-lasting reliability and excellent durability. A total constitutive plate of the metal gasket is extended along the chain case to form an extended part. This extended part has a chain case hole. The foam-rubber seal member seals a chain case opening and a three-surface joining portion defined by the chain case, a cylinder block and a cylinder head. The foam-rubber seal member is a separate and distinct member and is a sheet-like and loop-like combination of layers of foam rubber and a metal core plate interposed between these foam rubber layers.

Abstract: The invention refers to gaskets suitable for usage in internal combustion engines. The gaskets according to the invention comprise at least one metal layer, the metal layer having one or several openings in accordance with the number and location of the combustion chambers, and, if present, coolant and lubricant passageways of the internal combustion engine, and a metal ring located around the combustion chamber opening(s), the metal ring being laminated on the metal layer and joined to the latter over a plastic layer. The plastic layer provides the gasket in the region of the metal ring with plastic, plastic/elastic or elastic characteristics. Furthermore the invention refers to a method for manufacturing the gasket according to the invention.

Abstract: A valve cover gasket has a perforated central core of metal including protrusions extending from planar sides of the core. Silk screened on each side of the core is a silicone foam rubber layer adapted to replace traditional cork gasket structures used for same purpose. The silicone rubber layers include a foaming agent that causes the material to expand during an oven-curing period. The amount of expansion of the silicone rubber coating is up to three times the thickness of the coating originally applied. As disclosed, the oven cure is for approximately 10 minutes at 300 degrees Fahrenheit. The protrusions prevent the silicone rubber material from being fully compressed; the protrusions are designed not to flatten under normal gasket compression loads. The peaks of the protrusions act as compression loads stops to limit amount of permissible compression of the silicone rubber layers.

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: An edge coated gasket includes a base sheet made of compressible gasket material and having opposed faces and an interior edge surrounding and defining an aperture. An edge coating of polymer or other material is disposed on and seals the interior edge of the base sheet and may project beyond the facial planes of the base sheet to define protruding rims extending around the aperture. Face coatings may also be applied to one or more of the faces extending in relatively narrow strips around the aperture of the base sheet. When clamped between flange surfaces, the edge coating engages, conforms to, and seals against the flange surfaces to provide a seal against both interfacial and intersticial migration of fluid past the gasket. At the same time, the inherently good compression failure resistance of the compressible gasket material of the base sheet is preserved. Thus, a gasket with enhanced sealability and compression failure resistance is provided.

Abstract: A gasket body has a combustion opening and a coolant opening close to the combustion opening to define a narrow region of the gasket between the openings. An inner armor layer has an inner C-shaped section folded over an edge of the combustion opening adjacent to the coolant opening. The inner armor layer has top and bottom portions extending over the top and bottom surfaces of the narrow region of the gasket body. An outer armor layer has an outer C-shaped section folded over the inner C-shaped section. The outer armor layer has top and bottom portions extending over the top and bottom portions of the inner armor layer. The bottom portion of the outer armor layer extends across the entire width of the bottom surface of the narrow region of the gasket body and has a second C-shaped section folded up and over an edge of the coolant opening adjacent to the combustion opening.

Abstract: An edge coated gasket includes a base sheet made of compressible gasket material and having opposed faces and an interior edge surrounding and defining an aperture. An edge coating of polymer or other material is disposed on and seals the interior edge of the base sheet and may project beyond the facial planes of the base sheet to define protruding rims extending around the aperture. Face coatings may also be applied to one or more of the faces extending in relatively narrow strips around the aperture of the base sheet. When clamped between flange surfaces, the edge coating engages, conforms to, and seals against the flange surfaces to provide a seal against both interfacial and intersticial migration of fluid past the gasket. At the same time, the inherently good compression failure resistance of the compressible gasket material of the base sheet is preserved. Thus, a gasket with enhanced sealability and compression failure resistance is provided.

Abstract: An air intake manifold gasket has a perforated core of metal including protrusions or tangs extending from a first planar surface and a second planar surface of the core. Joined to each planar surface of the core is an expanded graphite sheet to form a gasket body having planar surfaces. Screen printed to form a bead on peripheral edges of the planar surfaces of the gasket body is a silicone foam rubber material adapted to replace traditional silicone rubber structures used for the same purpose. The silicone foam rubber material includes a foaming agent that causes the material to expand during an oven-curing period. The amount of expansion of the silicone rubber coating is up to three times the thickness of the coating originally applied. As disclosed, the oven cure is for approximately 10 minutes at about 300 degrees Fahrenheit.

Abstract: A gasket is disclosed, which is adapted for the use in sealing of a tri-face area where a cylinder block, cylinder head and timing-chain housing meet together and come into abutment against one another. With the gasket of this invention, a deposit of bonding agent is applied on an end lug of a solid gasket material to improve the adhesive property and close adherence of the solid gasket material with a fluid gasket material that is filled in the tri-face area. The fluid gasket material charged in the tri-face area is securely fastened to the solid gasket material through the bonding agent. The end lug of the solid gasket material on which the bonding agent is applied is exposed to the tri-face area where both the cylinder head and the cylinder block are cut at their confronting edges to form bevels.

Abstract: Flat gasket for sealing a sealing gap between sealing surfaces of machine components which are pressable against the flat gasket, the flat gasket having a gasket plate formed by several sheet metal layers and provided with at least one elastomeric sealing element in an area serving to seal a sealing gap area in which the component sealing surfaces lead to a locally varying sealing surface pressure at the flat gasket, the sealing element being arranged on a first one of the sheet metal layers and, in the mounted state of the flat gasket, extending through a cutout in a second sheet metal layer forming a first one of the main surfaces of the gasket plate; in order that the sealing element can already be applied by the gasket manufacturer, but, nevertheless, is protected against damage in the course of assembly of the machine components, the gasket is so designed that the sealing element is in the form of a sealing element formed from a material which is applied to the first sheet metal layer and is curable in s

Abstract: An edge coated gasket includes a base sheet made of compressible gasket material and having opposed faces and an interior edge surrounding and defining an aperture. An edge coating of polymer or other material is disposed on and seals the interior edge of the base sheet and may project beyond the facial planes of the base sheet to define protruding rims extending around the aperture. Face coatings may also be applied to one or more of the faces extending in relatively narrow strips around the aperture of the base sheet. When clamped between flange surfaces, the edge coating engages, conforms to, and seals against the flange surfaces to provide a seal against both interfacial and intersticial migration of fluid past the gasket. At the same time, the inherently good compression failure resistance of the compressible gasket material of the base sheet is preserved. Thus, a gasket with enhanced sealability and compression failure resistance is provided.

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: An MLS cylinder head gasket includes a relatively thick intermediate layer having resilient sealing beads flanked by stopper beads. The stopper beads limit compression of the sealing beads, which surround combustion cylinder bore apertures. The three-layer gasket, particularly designed for heavy duty racing engines, provides a relatively robust cross-section in web-areas between cylinder bore apertures. A thin bottom layer includes wrap-around flanged portions extending about cylinder bore edges of the intermediate layer to partially overlap cylinder bore aperture areas of that layer. A thin top layer overlies the intermediate layer, as well as the overlapping portions of the bottom layer. In one described embodiment, the overlapping portions are limited to cylinder bore edges between cylinder bores. As a between-engine-overhaul indication of engine health, the top gasket layer is adapted via plastic deformation to form a permanent indentation in an aluminum cylinder head to signal excessive engine operation.

Abstract: A gasket includes an intermediate layer having resilient sealing beads flanked by stopper beads. The three-layer gasket, particularly designed for heavy duty racing engines, provides a relatively robust cross-section in web-areas between cylinder bore apertures. A thin bottom layer includes wrap-around flanged portions extending about cylinder bore edges of the intermediate layer to partially overlap cylinder bore aperture areas of that layer. The flanged portions include a plurality of waves to increase forces to generate the seal. A thin top layer overlies the intermediate layer, as well as the overlapping portions of the bottom layer. In one described embodiment, the overlapping portions are limited to cylinder bore edges between cylinder bores. As a between-engine-overhaul indication of engine health, the top gasket layer is adapted via plastic deformation to form a permanent indentation in an aluminum cylinder head to signal excessive engine operation.

Abstract: The composite material for a metal gasket includes a metal plate; a rubber layer fixed on the surface of the metal plate; and a solid lubricant layer fixed on the rubber layer. The solid lubricant layer contains polytetrafluoroethylene and a resin as main components, and has a friction coefficient equal to 0.15 or lower. Thus, the seal durability of the metal gasket is improved by effectively preventing fretting wear.

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 monolayer metal gasket is disclosed, which may be kept against deformation around a bolt hole and further made stable in sealing stress around a gas hole between mating surfaces of confronting components. A first extra thickness around the gas hole is provided by turning back a part of a metallic sheet on a major flat of the metallic sheet, with leaving a space open between them to form a folded construction having elasticity. A second extra thickness around a bolt hole is a closely layered construction of nearly rigid body little to be deformed. When the monolayer metal gasket is squeezed between the mating surfaces of the confronting components, a clearance between the mating surfaces may be regulated to a preselected distance by virtue of the second extra thickness that is little to be deformed.

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: In a metallic gasket having a metallic sheet made with a recess surrounding around a diverse type of hole, in which an elastic sealing member is installed, a relation between the recess and the elastic sealing member in their cross sections and also configurations is so specified as to use the elastic sealing member within a range of elastic limit inherent in the elastic sealing member, thereby improving the sealing performance of the metallic gasket. The elastic sealing member is smaller than the recess in their cross section perpendicular to the major side of the metallic sheet. Thus, the elastic sealing member, when the metallic gasket is squeezed, may serve its useful function within the range of inherent elastic limit.

Abstract: Process for manufacturing a cylinder head gasket with a gasket plate which comprises several sheet metal layers and with a metallic spacer ring which surrounds a combustion chamber through-opening of the cylinder head gasket and is welded by a ring-shaped weld seam to one of the sheet metal layers; to improve the sealing ability of the cylinder head gasket around the combustion chamber through-opening and to shorten the welding time, the spacer ring is secured in a gas-tight manner by electric pulse welding to the sheet metal layer carrying it by a continuous, ring-shaped, uniform weld seam closed within itself by the spacer ring and the sheet metal layer being clamped between a first electrode resting against the spacer ring and a second electrode resting against the sheet metal layer and a current pulse being passed through a ring-shaped, sharp edge-like or bead-like contact projection of the one electrode pressed against one of the parts to be welded to one another, through the parts to be welded to one an