Abstract: An engine seal for preventing fluid leaks at the seam formed by the joining of two engine components includes a flowable sealant disposed along a seal bearing surface of one of the engine components and a seal engaging surface disposed along the second engine component so that upon joining the engine components, the flowable seal will be compressed between the seal bearing surface and the seal engaging surface.
Abstract: A gasket comprises a main body having at least one opening and a plurality of elastic members provided on at least one of upper and lower surfaces of the main body. The elastic members project outwardly from the upper or lower surface. The characteristics of at least one of the elastic members are different from those of the others. The elastic members surround the opening so that when the gasket is compressed between two parts, the elastic members deform to thereby securely seal around the opening.
Abstract: A hydraulic sealing apparatus for sealing an annular gap between two members which are movable relatively to each other and one of which has an annular groove for receiving the sealing apparatus, the groove having a side wall at least on the low pressure side, comprising an elastic ring and a slide ring which consists of a slidable plastics material and has an annular sealing rib at its free circumferential surface.
Abstract: Rotary lead-throughs through the wall of vacuum chambers have to be lubricated until now in order to avoid cold welding of a metallic shaft with vacuum sealing rings of the lead-through. The invention pertains to a new construction in which the inner wall of a bore through the wall of the vacuum chamber, through which the shaft is led, is lined with a sleeve of a low-friction synthetic material, preferentially polytetrafluoro-ethylene, with the sleeve being sealed against the inner wall and against the shaft by sealing rings, preferentially made of an elastomer. Through this construction, constant minimum friction, without the necessity of using additional lubricating agents and reliable sealing in dry operation, even under maximum stress, are acheived.
Abstract: A valve stem sealing assembly includes a valve spring, a valve spring retainer, and a valve spring seal which is releasably connected either directly or indirectly to the valve spring retainer. Such a valve stem sealing assembly can be installed as a unit during mass production of engines. In one embodiment the valve spring retainer is provided with a sleeve which releasably supports the valve stem seal. Another embodiment includes a protection element on which the valve spring rests to keep it from digging into the metal of the engine. Both the protection element and the valve spring retainer are provided with sleeves in the second embodiment, and these sleeves are releasably connected. The valve stem seal is lodged in the sleeve of the protection element. In both embodiments the releasable connection, which may be provided by force-fitting one element into another, is released after installation of the assembly.
Abstract: A sealing ring comprising a resilient ring and a pair of axially spaced coaxial rigid rings secured to the outside of the resilient ring. The rigid rings are spaced from end surfaces of the resilient ring a distance substantially less than the axial extent of a rigid ring. The rigid rings have an axial extent substantially greater than their radial extent. In one embodiment, the resilient ring has on its outer surface an integral annular rib that is disposed between and is in contact with both of the rigid rings, the radially outer surface of the rib being flush with the outer surfaces of the rigid rings. In another embodiment, there is a free space between the rigid rings in the undeformed condition of the resilient ring.
Abstract: A bearing and magnetic fluid seal assembly includes a shaft mounted by axially spaced-apart bearings for rotation relative to a housing. A magnetic fluid seal includes an annular magnet axially positioned between the bearings in the space that is wasted and not utilized for any purpose, and a thin, disk-like annular polepiece positioned between one of the bearings and the environment to be protected by the seal. Magnetic flux from the magnet is conducted by a magnetically permeable housing or shaft to an annular gap between the outside diameter of the polepiece and the housing. A magnetic fluid is retained in the gap by the magnetic flux, thereby providing an exclusion seal. Embodiments utilizing radially and axially polarized magets are provided. A magnetic fluid seal can be provided at each end of the assembly. The bearings supporting the shaft can be magnetically permeable or nonmagnetic. The seal(s) can be electrically conducting or nonconducting depending upon the type of ferrofluid used.
Abstract: A metal-to-metal seal for a rotary cone rock bit consists of pre-lapped metal sealing surfaces formed on opposing seal rings prior to assembly of the seal rings into seal cavities formed between the rotary cones and their respective journal bearings. A first seal ring is fabricated from a softer metallic material than its opposing second metallic ring and the second ring has more seal surface area than the first ring to accommodate for cone wobble or eccentricities that may occur during operation of the bit in a borehole.
Abstract: An axial sealing arrangement in a rotary-piston engine, comprising a sealing member that is, for example, made of metal, and is inserted into a groove in one surface of an engine component while it bears against the wall of a surface of a second component that moves relative to the first component. On that surface that bears against the low-pressure side wall of the groove, and on that portion facing the base of the groove, the sealing member is provided with a rounded ledge via which it bears against the low-pressure side wall of the groove. In addition, on that side facing the opposite contact surface, the sealing member is provided with recesses which extend transversely with respect to the longitudinal extension of the sealing member, and which may communicate with a groove extending beside the rounded ledge. The recesses open toward the opposite contact surface and thus into the clearance that is to be sealed. The sealing member may be manufactured by rolling a strip between two profiling rollers.
Abstract: A compensating rotary seal assembly adapted to function as a substitute for a stuffing box. The seal assembly includes end plates which may be variably oriented with respect to each other by threaded bolts extending between the plates. The bolts are adjusted to compress an annular elastomeric band defining a chamber between the end plates and also effecting a driving connection between washers and the ends of a sleeve surrounding a shaft, the ends of the washers remote from the sleeve being in a sliding contact with wear surfaces on the end plates.
Abstract: A metal-to-metal Belleville seal for a rotary cone rock bit consists of pre-lapped metal sealing surfaces formed on opposing seal rings prior to assembly of the seal rings into seal cavities formed between the rotary cones and their respective journal bearings. A first seal ring is fabricated from a softer metallic material than its opposing second metallic ring and the second ring has more seal surface area than the first ring to accommodate for cone wobble or eccentricities that may occur during operation of the bit in a borehole.
Abstract: A gasket formed from a perforated core sheet having a first facing layer formed from a material having a relatively high degree of thermal conductivity on one side thereof and a second facing layer formed from a relatively compressible, non-asbestos gasket material on an opposite side thereof. The facing layers are attached to the core by mechanical retaining means. The retaining means can be formed as a pair of opposed tangs on opposite sides of each perforation in the core or as a dome-shaped structure having an aperture formed in an end thereof.
December 23, 1987
Date of Patent:
April 18, 1989
Paul E. Gallo, James H. Larsen, Mary K. Jurczyk
Abstract: A lip seal device for sealing the gap between a housing and a rotary shaft comprises a case surrounding the rotary shaft, a plurality of lip seals fitted inside the case and including at least two lip seals, support means for holding the lip seals on the outer circumferential portions thereof and seal means located on the outside of the circumferential surface of the case. The inner circumferential portions of the lip seals are curved toward the sealed fluid and have a sealing surface in contact with the outside circumferential surface of the rotary shaft. The contact pressure of the lip seal furthest from the sealed fluid is lower than the contact pressure of the lip seal closest to the sealed fluid.
Abstract: A submerged rotating shaft mechanism, including a gearbox with a gland connected to it and a shaft projecting from the gearbox through and beyond the gland, has an inner seal adjacent the gearbox, an outer, labyrinth, seal adjacent an outer end of the gland, the inner and outer seals forming, with the inside of the gland and the outside of the shaft, a chamber, a fitting communicates, through the gland, with the chamber, and compressed air is supplied to the chamber through the fitting to provide a constant flow of air through the labyrinth seal to flush that seal.
Abstract: A seal for sealing the space between inner and outer ring members comprising a sealing ring and a retaining element engaging in a recess in the outer ring with axial pretension and means mounting the sealing ring and retaining member in a manner for preventing relative movement in the radial direction between the sealing ring and the retaining member.
Abstract: In a sealing and wiper arrangement, a sealing ring (5), which may also serve a wiper function, and a stressing ring arrangement (6) are accommodated in a groove (4) of a first machine part (1). The stressing ring arrangement (6) is positioned between the sealing ring (5) and the base of the groove and urges the sealing ring against the surface of a second machine part (2) which is capable of a movement relative to the first machine part (1), in a direction perpendicular to the direction of the groove (4). The sealing ring (5) is in contact with a second machine part (2) by a wiper web (8) and an edge (11) provided on its high-pressure side. The edges (10, 11) provided on the sealing ring (5) are loaded independently of each other. This is achieved by giving the stressing ring arrangement (6) the form of two separate portions of a stressing ring. In one embodiment two completely separate stressing rings (61, 62) are provided. In another embodiment a Quad-ring (40) is provided.
Abstract: An airborne-sound sealing means for an opening, particularly of a manual gear shift lever of an automobile that is pivoted in it and is arranged in a cutout on the side of the body. A sound insulating element that tightly encloses the shaft of the gear shift lever and is filled with a medium is arranged in this cutout.
May 14, 1987
Date of Patent:
April 4, 1989
Dr. Ing. h.c.F. Porsche Aktiengesellschaft
Abstract: A method of sealing a joint between two adjacent members comprises the steps of forming a gap between the members to be sealed and then introducing a bead of resilient solid material into the gap. The bead is subsequently treated to render it temporarily plastic or fluid so as to cause it to adhere to the facing edges of the members. This treatment can best be effected using a hot air blower. The bottom of the bead may be provided with a non-adhesive strip to prevent adhesion to the bottom of the gap, or the process may be performed in such a way that the bottom portion of the bead is not fused so that it does not adhere to the bottom of the gap.
Abstract: The same size and weight of tubular products, but in different grades of material, are made for universal connection but with seal areas that differ appropriately for adequate sealing without overstressing the connection members for the pressures encountered where each tubular length is put in service. The angle of the conically tapered seal on all box members is made the same for all grades of the products. The pin member of medium grade is made with an equal length seal area and adjacent contracting area on its forward end. The pin member of lower grade is made with a shorter length seal area than its adjacent contacting area, thereby also placing the seal area further from the pin member distal end. This stiffens the pin member. The pin member of higher grade is made with a longer length seal area than its adjacent contacting area.
December 28, 1987
Date of Patent:
April 4, 1989
The Hydril Company
Keith C. Mott, Gary E. Kirsch, H. Paul Barringer, Lawrence Y. Tung