Abstract: In a cylinder head gasket with a metallic gasket plate comprising a combustion chamber opening enclosed by a bead which is elastically deformable in its height, and a stopper surrounding the combustion chamber opening and delimiting the deformation of the bead, the stopper being formed by elevations of a sheet metal layer of the gasket plate which are obtained by deformation of this sheet metal layer, in order to obtain such a stopper which is resistant to deformation, the stopper is designed such that in sections through the sheet metal layer along circular cylindrical surfaces coaxial with the combustion chamber opening the stopper respectively comprises a row of discrete elevations following one another in a circumferential direction of the combustion chamber opening and corresponding depressions located directly opposite these elevations in the sheet metal layer, and in a plan view of the sheet metal layer in the area of the stopper, the total area occupied by the elevations is at least half of the total

Abstract: In order to create a fuel cell unit, comprising a cathode-anode-electrolyte unit and a contact plate which is in electrically conductive contact with the cathode-anode-electrolyte unit, which requires only small production resources and is thus suitable for large-scale production it is suggested that the fuel cell unit comprise a fluid guiding element which is connected to the contact plate in a fluid-tight manner, forms a boundary of a fluid chamber having fluid flowing through it during operation of the fuel cell unit and is designed as a shaped sheet metal part.

Abstract: In order to provide a cylinder head gasket, comprising at least one gasket sheet, with at least one combustion chamber opening and a combustion chamber bead, the height of which may be elastically deformed and surrounds the combustion chamber opening, and at least one deformation limiting means limiting the deformation of the combustion chamber bead, wherein the deformation limiting means assures adequate protection of the combustion chamber bead and adequate sealing surface pressure over a wide range of operating conditions of the engine, it is proposed that the cylinder head gasket comprises a compensation means which comprises at least one compensation element, the height of which varies essentially reversibly when the operating status of the engine changes, and which at least partially supports both the combustion chamber bead and the deformation limiting means.

Abstract: In order to create a fuel cell unit, comprising a cathode-anode-electrolyte unit and a contact plate which is in electrically conductive contact with the cathode-anode-electrolyte unit, which requires only small production resources and is thus suitable for large-scale production it is suggested that the fuel cell unit comprise a fluid guiding element which is connected to the contact plate in a fluid-tight manner, forms a boundary of a fluid chamber having fluid flowing through it during operation of the fuel cell unit and is designed as a shaped sheet metal part.

Abstract: In a cylinder head gasket with a metallic gasket plate comprising a combustion chamber opening enclosed by a bead which is elastically deformable in its height, and a stopper surrounding the combustion chamber opening and delimiting the deformation of the bead, the stopper being formed by elevations of a sheet metal layer of the gasket plate which are obtained by deformation of this sheet metal layer, in order to obtain such a stopper which is resistant to deformation, the stopper is designed such that in sections through the sheet metal layer along circular cylindrical surfaces coaxial with the combustion chamber opening the stopper respectively comprises a row of discrete elevations following one another in a circumferential direction of the combustion chamber opening and corresponding depressions located directly opposite these elevations in the sheet metal layer, and in a plan view of the sheet metal layer in the area of the stopper, the total area occupied by the elevations is at least half of the total

Abstract: Cylinder head gasket with a gasket plate having at least one combustion chamber opening and comprising at least two sheet metal layers, a first one of which is provided with at least one bead which is elastically deformable in its height and encloses the combustion chamber opening, and a second one of which is provided with at least one deformation delimiting device delimiting deformation of the bead and surrounding the combustion chamber opening; in order to achieve as rigid a delimitation of the deformation as possible, the original second sheet metal layer is formed by a steel sheet which is plastically deformable by cold flow pressing, and in a plan view of the second sheet metal layer the deformation delimiting device forms a two-dimensional pattern of discrete, cup-like depressions, with the total volume of the depressions stamped by flow pressing being approximately equal to the total volume of the elevations formed by the material of the second sheet metal layer that is displaced during the stamping o

Abstract: The invention relates to a metallic cylinder-head gasket for an internal combustion engine which has a cylinder block having adjacent combustion chambers and has a cylinder head screwed to said cylinder block, with at least one cover plate made of elastic metal and a carrier plate, which are arranged one above the other and are provided with a plurality of combustion-chamber orifices corresponding to the combustion chambers of the internal combustion engine, a bead being provided around each combustion-chamber orifice at a distance from the latter, so as to leave a sheet-metal edge portion in the orifice-edge region, the spring stroke of said bead being limited by at least one deformation limiter arranged concentrically to the bead in the axial region of the sheet-metal edge portion and/or in the axial region radially on the outside in relation to the bead, a support element formed separately from the deformation limiter being provided in the axial region of the deformation limiter at a distance from the edge

Abstract: In order to provide a fuel cell unit, comprising a housing, a substrate and an electrode disposed on an electrode side of the substrate, wherein the substrate is constructed in such away that it allows a gas from a gas compartment disposed on a gas compartment side of the substrate to pass through to the electrode, in which fuel cell unit the gas compartment disposed on the gas compartment side of the substrate is easily and reliably sealed in a gas-tight manner relative to a further gas compartment, it is proposed that the substrate comprises at least one substantially gas-tight zone, which extends from one surface of the substrate, through the substrate to an opposite surface of the substrate.

Abstract: In order to provide a fuel cell unit, comprising a housing which limits at least one gas chamber and has a gas opening in a first housing wall and a gas opening in a second housing wall located opposite the first housing wall, the housing of which has an adequate deformation stability in relation to the sealing surface pressure required for a flat seal even at high temperatures, it is suggested that the fuel cell unit comprise at least one supporting element which is arranged between the first housing wall and the second housing wall and keeps the two housing walls at a distance from one another.

Abstract: In order to produce a seal for sealing a clearance gap between two electrically conductive components that requiring sealing, and in particular, between two components of a composite block of fuel cells, whilst electrically insulating the components which are to be sealed, and which exhibits adequate fluid imperviousness and has an adequate electrically insulating effect even at high operational temperatures and over a long period of operation, it is proposed that the seal should comprise at least one sealing element which comprises a ceramic material, wherein the seal is of annular form and comprises at least one seating surface for at least one of the components requiring sealing and wherein said surface is at least partially aligned substantially parallel to or inclined to the ring-axis of the seal.

Abstract: The invention relates to a metallic cylinder head gasket for an internal combustion engine having a cylinder block with adjacent combustion chambers and a cylinder head connected to the said block by bolts, having at least one sheet metal layer of resilient metal, which is provided with a plurality of combustion chamber openings corresponding to the combustion chambers of the internal combustion engine, and also fluid and bolt passage openings, where, around each combustion chamber opening, at a distance from the latter, leaving a straight sheet metal section in the opening edge area, a bead is provided, whose spring travel is limited by a stopper extending concentrically with respect to the bead the stopper being profiled in terms of height and/or width in accordance with reductions in compression pressure to be expected in specific areas on account of reduced component stiffness of cylinder block and cylinder head in the clamped state of the cylinder head gasket, where, when profiling the stopper height and

Abstract: The invention relates to a metallic cylinder head gasket for an internal combustion engine, having a cover plate which faces the cylinder head of the internal combustion engine in the installed state and is provided with one or more openings arranged next to one another, corresponding to the combustion chambers of the internal combustion engine. The cover plate has a bead around each opening with a space between the bead and the opening. This leaves a straight sheet metal portion in the edge region of the opening. Arranged adjacent to the bead around each opening radially inwards from the respective bead facing away from the cylinder head is a stopper for the bead, which at the same time forms an upward combustion chamber extension of the seal. In this case, the stopper decreases in its thickness radially outwards in such a way that the surface pressure in the region of the stopper is essentially homogeneous over the width of the stopper under operating conditions.

Abstract: Flat gasket, in particular, cylinder head gasket with a gasket plate which has at least one aperture and at least one sheet-metal layer which is provided with a bead surrounding the aperture, as well as with a stopper device preventing any excessive bead deformation; so that the sheet-metal layer does not tear even during dynamic pressure loads on the bead in the bead area which accompany a considerable flattening of the bead, the recess formed by the bead is filled over at least a considerable part of its depth with an elastomeric material which has appreciable flow properties under pressure even at ambient temperature (21° C.), i.e. is plastically deformable to a not inconsiderable extent.

Abstract: The invention relates to a metallic cylinder head gasket for an internal combustion engine, having a cover plate which faces the cylinder head of the internal combustion engine in the installed state and is provided with one or more openings arranged next to one another, corresponding to the combustion chambers of the internal combustion engine. The cover plate has a bead around each opening with a space between the bead and the opening. This leaves a straight sheet metal portion in the edge region of the opening. Arranged adjacent to the bead around each opening radially inwards from the respective bead facing away from the cylinder head is a stopper for the bead, which at the same time forms an upward combustion chamber extension of the seal. In this case, the stopper decreases in its thickness radially outwards in such a way that the surface pressure in the region of the stopper is essentially homogeneous over the width of the stopper under operating conditions.

Abstract: Cylinder head gasket with a gasket plate which has several metal layers placed on top of one another, at least one combustion chamber aperture as well as at least one fluid aperture and is provided with a combustion gas sealing system around the combustion chamber aperture as well as with a fluid sealing system around the fluid aperture, wherein two external metal layers (outer layers) of the gasket plate enclose between them at least one inner metal layer (inner layer) of the gasket plate and at least one of the metal layers has at least one bead surrounding the fluid aperture; in order to be able to produce such a cylinder head gasket as simply as possible and at the same time minimize the risk of the sealing surfaces of engine block and cylinder head being impaired by the cylinder head gasket, such a cylinder head gasket is designed such that (a) the bead surrounding the fluid aperture is provided on an inner layer and the latter is such a spring-steel sheet metal layer that its bead is stressed predomina

Abstract: The invention relates to a metallic cylinder head gasket for an internal combustion engine, having a carrier plate which is arranged between cover plates. The carrier plate and cover plates are provided with passages which are commensurate with the combustion chambers of the internal combustion engine. The cover plates are provided, around each passage, with a resilient bead. Adjacent to each bead, and also extending around each passage, is a bead deformation limiter. The deformation limiters are shaped to prevent the occurrence of high edge pressures.

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 metallic cylinder head gasket for an internal combustion engine, has a carrier plate which is arranged between cover plates. The carrier plate and cover plates are provided with passages which are commensurate with the combustion chambers of the internal combustion engine. The cover plates are provided, around each passage, with a resilient bead. Adjacent to each bead, and also extending around each passage, is a bead deformation limiter. The deformation limiters are shaped to prevent the occurrence of high edge pressures.

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: The invention relates to a metallic cylinder head gasket for an internal combustion engine, having a carrier plate which is arranged between cover plates. The carrier plate and cover plates are provided with passages which are commensurate with the combustion chambers of the internal combustion engine. The cover plates are provided, around each passage, with a resilient bead. Adjacent to each bead, and also extending around each passage, is a bead deformation limiter. The deformation limiters are shaped to prevent the occurrence of high edge pressures.