Abstract: This invention provides a metal gasket and its production method which prevents damage to folded portions by fold-machining and damage to metal materials after fastening, and expands the range of selection of materials for elastic metal plates, by reducing the thickness of a predetermined region of a elastic metal plate at which folded portions are to be formed. The thickness of the folded portion of the elastic metal plate is reduced from the folding side in an inner region of folded base portions and in regions in which folded free ends are positioned. Bend-machining is made gently at the folded base portions subjected to fold-bend machining, and the folded base portions each have a gap there-inside. The folded free ends do not come into contact with the elastic metal plate due to recessed surfaces. Accordingly, cracks and wrinkles do not occur at the folded base portions, and the folded free ends do not leave friction traces on the elastic metal plate.
Abstract: The seal (4) has an annular body (10) with a generating section which is substantially rectangular and with an inner cylindrical surface (18) having a diameter (d1) substantially equal to the nominal diameter of the tubing (2) to be connected to the coupling (1). The seal (4) has a rib (20) projecting radially inwardly and having an inner diameter (d2) less than the outer diameter (d1) of the tubing. The seal also has an annular lip (24) which projects axially and has an inner surface with a diameter (d3) intermediate the internal diameter (d2) of the radial rib (20) and the diameter (d1) of the inner surface (18) of the seal (4).
Abstract: A gas bearing face seal assembly for a gas turbine engine having improved sealing characteristics. The assembly can include support means which concentrically position a face seal member with respect to a seal radius, while permitting translation of the face seal with respect to a rotating sealing surface and radial growth of the seal member with respect to the housing. A clearance control ring means can be included to reduce and maintain radial clearance between the face seal member and a housing surface. The face seal member may be pressurized radially outwardly, and can include improved vent channel and vent passage means.
Abstract: A method and apparatus for protecting spaced high pressure seals in a high pressure chamber from damage caused by retained high pressure between the seals after the high pressure in the chamber has been released. A one-way check valve is coupled to the area between the seals and to the interior of the high pressure chamber to automatically vent the area between the seals only when the high pressure in the chamber has been released or removed.
Abstract: A dual coating system is utilized for a cylinder head gasket of an internal combustion engine. A lubricous, high temperature coating is located at the combustion seals while an elastomeric coating is located at fluid flow openings. The coatings are applied to entire sides of plates in such a manner that the coatings do not have to be selectively applied to, or masked off from any one particular layer. The thickness of the various gasket components can be adjusted by shims to obtain an optimum load balance between seals.
Abstract: A spiral wound gasket comprises an annulus constituted by a plurality of superposed turns of a profiled metal strip wound upon itself to form a spiral and, interposed between at least some of said superposed turns, a number of turns of a relatively soft sealant material in strip form, the width of said metal strip being selected so that prior to use the wound metal spiral is essentially flush with the surface of an associated guide ring and the width of the strip of relatively soft sealant material being selected so that prior to use, it projects a significant distance on both sides of the gasket from said superposed metal turns axially of said annulus. The preferred relatively soft sealant material is exfoliated graphite foil or a fluorocarbon resin, unsintered PTFE being particularly preferred. The sealant material preferably projects from the metal spiral to define an overall gasket thickness on the order of 25 to 40 percent greater than that of the guide ring.
Abstract: A radial shaft sealing ring has a filtering device which is disposed upstream of main seal. The filtering device comprises a sealing lip 3 which surrounds the shaft to be sealed with a cylindrical surface 5 spaced radially apart at a distance D, this gap being of a capillary narrowness. On the axial end facing chamber A to be sealed, the cylindrical surface 5 is bounded by a conical surface 10 which encloses a conical angle of 60 to 120 degrees.
Abstract: A hydraulic shaft seal (10) has a first elastomeric part (40) and a second elastomeric part (42). The first elastomeric part (40) has a surface (54) for sealingly engaging the peripheral surface (56) of a shaft (14), and is formed of a vulcanizable elastomeric composition which includes a first fluorinated rubber. The second elastomeric part (42) supports the first elastomeric part (40) in a sealing position, and is formed of a vulcanizable elastomeric composition which includes a second fluorinated rubber but is essentially free of the first fluorinated rubber. The first elastomeric part (40) is co-vulcanized with the second elastomeric part (42) and is bonded to the second elastomeric part (42) by cross-linking between the two elastomeric parts as a result of the co-vulcanization thereof.
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: A sealing device in accordance with the present invention includes a projected portion having a rubber-like elastic member on the outer periphery of a seal member, and an outer cylindrical portion extending toward the seal member on a flange portion of a sleeve member. This outer cylindrical portion covers an opening formed between the seal member and the flange portion, thereby preventing entry of dust. The outer cylindrical portion is further provided on the tip thereof with a bend portion which can be engaged with the projected portion. The projected portion, the outer cylindrical portion, and the bend portion form a small clearance which serves as a labyrinth seal. The projected portion is fixedly fitted with a protection ring for covering the opening formed between the seal member and the flange portion of the sleeve member so that the free end portion of the protection ring can be engaged with the flange.
Abstract: A metal head gasket comprising a metal skeleton plate with fire rings in the combustion openings and elastomeric sealing beads around the fluid openings. The fire rings are integrated with the gasket via elastomeric bridges so that they float in the combustion openings and the fluid opening elastomeric seals are molded around those openings and embed struts and fill voids which at least partially surround the openings. The elastomeric bridges and seals are molded in situ and may all be molded with the metal plate in one operation.
Abstract: A sealing apparatus for rotating shafts, in particular a stern tube seal for a propeller shaft of a ship with or without shaft bushings, with aligned gaskets resting on the shaft and located in a stationary support system, preferably of an axial face seal, and with a backup seal located in the support system, which is designed as a gland seal with soft packings, and a gland which can be moved in the axial direction in a guide body connected to the support system, whereby between the guide body and the gland there is a cavity system, into which, when there is a failure of the main seal, a hydraulic or pneumatic pressure medium can be introduced, which activates the backup seal, is characterized by the fact that the cavity system consists of a number of individual piston-cylinder units uniformly distributed over a circle which is concentric with the shaft axis, corresponding to each of which there is a branch current of the hydraulic or pneumatic pressure medium.
Abstract: A magnetic seal for a disk drive data storage unit is described where the magnet assembly comprising an annular magnet and two annular pole pieces are adhesively attached with the magnet intermediate the pole pieces and the assembly thereof then forcibly inserted, creating a force fit, into a shield which is formed as an annulus with an interior cylindrical surface engaging the exterior cylindrical surfaces of the magnet assembly. The force fit insures electrical continuity between the shield and the pole pieces. The shield extends into close proximity with the shaft being sealed and is provided with a relieved region immediately adjacent the interior cylindrical surface of the pole pieces to form a reservoir for receiving, trapping and retaining any ferromagnetic fluid which may escape from the gap between the pole pieces and the shaft. A mating shield is then assembled onto the previously assembled components after the introduction of the ferromagnetic fluid into the seal gaps.
January 16, 1992
Date of Patent:
December 7, 1993
International Business Machines, Corp.
Luke A. Cossette, Craig A. Delagardelle
Abstract: An engine compartment cover seal strip has a retention mechanism, securing mechanism, bulb seal and lip flange seal. The retention mechanism maintains the seal strip onto the edge of an engine compartment cover. The securement mechanism retains a member, such as insulation, adjacent to the edge of the engine compartment cover. The bulb seal is adapted to sealingly engage with a surface on axis with the cover edge to reduce noise and prevent precipitation from entering into the vehicle passenger compartment. The flange seal is to sealingly contact a second surface laterally positioned with respect to the cover edge to reduce noise and prevent precipitation from entering the passenger compartment. The lip flange seal includes a pair of bulbs which prevent unwanted deformation when the seal encounters inside and outside radius situations. The retention member, securement member, bulb seal and flange seal are co-extruded with one another to form an elongated seal strip.
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 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 piston head assembly has one, two or more grooves to receive piston rings. One or more of the grooves may receive multiple piston rings. One of the piston rings may have a wiper extension on the lower outside edge of the ring either of metal or elastomeric material. An elastomeric ring is retained preferably in a recess in the lower outer edge of the ring and has an outer surface starting inset from the top outer edge of the ring, but tapering to a diameter at least as great as the top outer edge. A circumferential groove from the outer edge. A circumferential groove from the bottom of the elastomeric material allows oil pressure to aid in sealing. A novel piston ring employs a circumferential channel facing outwardly with a shorter bottom channel facing outwardly with a shorter bottom channel sidewall. The channel is filled with elastomeric material providing at its outer surface a wiper member engaging the cylinder wall.
Abstract: A sealing assembly for relatively movable, e.g., rotating or reciprocating, members with a plurality of surfaces defining an annular space having a longitudinal axis, at temperatures up to about 1000.degree. F., comprises first and second annular rings of a hard, material having low frictional properties. Each of the annular rings has a radially extending wall and an axially extending wall defining an annular seal gland when fitted together and has external surfaces facing longitudinally outward relative to the longitudinal axis and external surfaces facing outward and inward radially of the longitudinal axis adapted to fit the surfaces of the annular space and of the relatively movable members. The annular rings have surfaces facing inwardly toward each other when assembled shaped to form an annular cavity.
Abstract: This invention relates to an adjustable packing for sealing a gap between two surfaces. The packing includes a packing member for sealing the gap, the sealing pressure thereof being adjusted by means of the elastomer, preferably two-component silicone, serving as a pressure medium. The elastomer is at least partially in the form of particles in an elastomer chamber. Between the elastomer and the walls of the elastomer chamber is preferably applied a suitable grease layer or a release agent layer which assists the function of the elastomer as a pressure medium.
Abstract: A sealing ring structure for effecting a fluid seal between a stationary member having an annular groove and a cylindrical member having a longitudinal axis movable relative to the groove includes a sealing ring disposed in the groove along with an outer annular stressing member disposed radially outwardly of the sealing ring and biasing the sealing ring into engagement with the cylindrical member. The sealing ring has an end surface facing a low pressure side of the groove and an outer surface in contact with the stressing member. The end surface and the outer surface intersect to form an edge in circular line contact with the low pressure side of the groove. The end surface is inclined toward a high pressure side of the groove with respect to a line perpendicular to the axis of the movable member and the outer surface is inclined with respect to a direction parallel to the axis of the movable member.