Abstract: A hydrodynamic face seal 100 for sealing between the cylinder head 300 and rotating sleeve 200 of a rotating liner engine. The face of the face seal provides a sealing zone 130 for maintaining a lubricant layer of about 2 micrometers between the face seal and the sleeve; and a loading zone 132. The loading zone includes hydrodynamic lift features such as inclined pads 150 or recessed step pads 152. Oil is supplied to annular oil supply passage 142 between the sealing zone and the loading zone, and flows from the annular oil supply passage to radial passages 144 located between the step pads. A spring pre-load is provided to the seal. An outer secondary seal 190 is provided to contain the lubricant. One or more inner secondary seals is provided to contain lubricant and combustion gases. Spiral oil pumping grooves may be provided.

Abstract: A face seal assembly including an annular mating ring housing having a proximal end surface with a channel therein, a mating ring insert disposed in the channel, the mating ring insert including a mating ring compressed within a first band to maintain the integrity of the mating ring. An annular sealing ring housing has a distal end surface with a channel therein, and a sealing ring insert is disposed in the channel, the sealing ring insert including a sealing ring compressed within a second band to maintain the integrity of the sealing ring. The mating ring faces the sealing ring to prevent fluid from escaping therebetween. A method of making such a face seal assembly is also disclosed as is a complete face seal assembly useful in the top drive unit of an offshore drilling unit.

Abstract: A gas seal for providing a seal between a pair of relatively rotatable components is provided with a stand-still seal which will seal between the components when the components are stationary, the stand-still seal having a sealing element mounted in sealing relationship with respect to one of said components and being displaceable into sealing engagement with the other component when the components are stationary with respect to one another.

Abstract: A primary objective of the present invention is to decrease the friction coefficient of the sliding face of a sliding element and to improve its seal performance. The sliding element disposes a plurality of elongate dimples in the outer circumferential region and the inner circumferential region relative to a boundary reference line and the inclination of the dimples located in the outer circumferential region is different from that of the dimples located in the inner circumferential region. The longitudinally forward edge of the outer circumferential dimples relative to a rotational direction is inclined toward the outer circumference and the longitudinally forward edge of the inner circumferential dimples relative to a rotational direction is inclined toward the inner circumference.

Abstract: A hydrodynamic face seal 100 for sealing between the cylinder head 300 and rotating sleeve 200 of a rotating liner engine. The face of the face seal provides a sealing zone 130 for maintaining a lubricant layer of about 2 micrometers between the face seal and the sleeve; and a loading zone 132. The loading zone includes hydrodynamic lift features such as inclined pads 150 or recessed step pads 152. Oil is supplied to annular oil supply passage 142 between the sealing zone and the loading zone, and flows from the annular oil supply passage to radial passages 144 located between the step pads. A spring pre-load is provided to the seal. An outer secondary seal 190 is provided to contain the lubricant. One or more inner secondary seals is provided to contain lubricant and combustion gases. Spiral oil pumping grooves may be provided.

Abstract: The invention is a single-piece seal assembly comprising an annular seal body. A retainer is positioned at a first end of the seal body. A rotable seal is concentric with the retainer and has a notch positioned on an inner diameter of a first face of said rotable seal. In the notch is positioned a single shim. The shim is of a length such that it is capable of providing a selected seal compression. An annular bellows having first and second ends is affixed to an inner diameter of the seal body. On the first end of the bellows is a ring holder. The ring holder holds a ring seal.

Abstract: A seal arrangement for providing a seal between a nuclear reactor in-core instrument housing and an instrument contained within the housing includes a lower seal assembly surrounding an outer portion of the in-core instrument housing, an upper seal assembly surrounding an outer portion of the in-core instrument, a seal housing enclosing the lower and upper seal assemblies, and lower and upper compression assemblies positioned on respective ends of the seal housing. The compression assemblies each include a drive nut and a compression collar. The compression collars engage and apply an axial load on the seal assemblies to maintain a reliable seal between the seal housing and the outer portion of the in-core instrument housing, and between the seal housing and the outer portion of the in-core instrument.

Abstract: A pair of primary and secondary mechanical seals are arranged tandem in an axial direction around a rotating shaft in a space between the rotating shaft and a housing having a shaft sealing part. The center or intermediate liquid is sealed into a center room or intermediate chamber between both mechanical seals. The center liquid has an amount that is less than the volume of the center room and enough to soak one part of rotating elements of the secondary mechanical seal. The gas vent line is provided with the housing of the shaft sealing part. The gas vent line faces and opens to the center room. The baffle plate is provided with the housing of the shaft sealing part. The baffle plate intersects a circumferential direction of the center room. Thus, when rotating the rotating shaft, the center liquid is stirred and scattered by collision with the baffle plate to lubricate the sealed slide surface.

Abstract: A non-contacting gas compressor seal assembly is disclosed with an intermediate buffer chamber. The process gas is corrosive or otherwise hazardous and is contained from entering the atmosphere by pumping the barrier gas toward the process fluid. The inboard seal of the assembly is designed to maintain a sealing relationship in the event of loss of buffer gas pressure by operating as a non-contacting seal on the process fluid.

Abstract: A composite face seal having an annular seal rotor with a metal base portion and a radially extending flange. The flange having first and second axially facing surfaces. A first ceramic ring is mounted to the first surface of the flange by a first braze joint and a second ceramic ring is mounted to the second surface of the flange by a second braze joint. The composite face seal assembly further includes an annular stator having an axially facing surface that sealingly engages an axially facing surface of one of the ceramic rings. Each of the braze joints may comprise a molybdenum ring disposed between two braze rings or, for thicker seal assemblies, molybdenum and nickel rings disposed between braze rings.

Abstract: A fitting including a housing (2), a rotatable body (4) which is situated in the housing and which may advantageously be constructed in the form of a conical plug, a bushing (18) provided in the housing to floatingly mount and seal the rotatable body (4), a cover (14) connected to the housing (2), a shaft (12) coupled with the rotatable body (4) and extended out through the cover (14), and at least one sealing element (30, 44) associated with the shaft (12). The fitting is configured in such a way that the bushing (18), the at least one sealing element (30, 44), and the cover (14) can be positioned and mounted centrally and free from transverse forces in relation to the axis (10) of the floatingly mounted rotatable body (4).

Abstract: A primary objective of the present invention is to decrease the friction coefficient of the sliding face of a sliding element and to improve its seal performance. The sliding element disposes a plurality of elongate dimples in its first sliding face in which forward edges of the dimples relative to a rotational direction are inclined with respect to a tangential direction of a rotational circumference. The sliding element also disposes a second sliding face which has either a plane surface or second dimples and is located in the opposite side of the first sliding face relative to the process fluid.

Abstract: An improved oil seal is provided for sealing passage of a rotatable shaft through an end wall of a bearing housing in a turbomachine or the like, wherein the shaft is rotatably supported within the bearing housing by oil-lubricated bearings. The improved oil seal comprises a dynamic oil-air separator and a slinger rotor mounted on the shaft for rotation therewith, the slinger rotor having an outwardly extending slinger ring with an outboard seal face with radially oriented slots and a circumferential groove or grooves.

Abstract: A primary objective of the present invention is to decrease the friction coefficient of the sliding face of a sliding element and to improve its seal performance. The sliding element disposes a plurality of elongate dimples in the outer circumferential region and the inner circumferential region relative to a boundary reference line and the inclination of the dimples located in the outer circumferential region is different from that of the dimples located in the inner circumferential region. The longitudinally forward edge of the outer circumferential dimples relative to a rotational direction is inclined toward the outer circumference and the longitudinally forward edge of the inner circumferential dimples relative to a rotational direction is inclined toward the inner circumference.

Abstract: Multiple circumferential rows of textured features are formed between the outer peripheral edge and the inner peripheral edge of a seal. The multiple circumferential rows of textured features form a boundary for incoming dirt and wash away abrasive particles as well as act as lubricant wells. The multiple rows provide additional protection from leakage and wear.

Abstract: A face seal device for use with components rotating at a high rotational speed includes a non-rotating face seal ring (5) and a rotary face seal ring (11) mounted in a loose fit on and rotatable together with the rotary component. The rotary face seal ring includes a sealing face (6) which, in operation, is essentially radially aligned for cooperation with an opposite sealing face (16) of the non-rotating face seal ring. The rotary face seal ring is formed of at least a base portion (20) and an extension portion (21). The extension portion provides an additional mass and has an areal center of gravity axially spaced from the areal center of gravity of the base portion An axial spacing z between the areal centers of gravity and the mass m of the extension portion are in specific relationship with each other, whereby in operation a torque directed towards the non-rotating face seal ring is applied to the rotary face seal ring.

Abstract: A mechanical seal for providing a seal around the drive shaft of a variable displacement swash plate type compressor used in an air conditioning system for a vehicle comprising a rotating bearing surface, an associated stationary bearing surface and a lubricant embedded in the stationary bearing surface. During operation of the compressor, the rotating bearing surface is caused to move against the stationary bearing surface causing lubricant to be released between the bearing surfaces, thereby providing efficient lubrication of the bearing surfaces.

Abstract: Non-contacting face seals having sliding rings with grooves formed in the lateral planes thereof. Each groove has inlet and outlet ends, with the traverse cross-section of the groove decreasing from the inlet end to the outlet end. The outlet end of the groove defines a recess of approximately 7 microns in the lateral plane. The bottom surface of the groove curves longitudinally and transversely, with a maximum curvature of about 4 microns. The lateral edges of the groove are of different lengths, so that one extends farther from the plane of the sliding rings than the other. The grooves have a variety of shapes, including spiral, double crossed spiral, and others. The seals help maintain high accuracy and dimensional repeatability of the grooves in the sliding rings for industrial and manufacturing applications.

Abstract: Seals of this invention comprise an annular elastomeric ring-shaped body having a dynamic surface disposed along a first body portion, the dynamic surface comprising at least two surface elements that project outwardly therefrom to provide multiple barriers to fluid and debris migration thereacross when placed into contact with a rock bit rotary dynamic surface. The seal dynamic surface includes a recessed portion disposed between the surface elements, and a static seal surface disposed along a second body portion. At least one of the surface elements includes a wear surface that is formed from a material that is more wear resistant than materials that are used to form a remaining portion of the seal. A preferred wear surface is one formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material.

Abstract: Rotary barrier face seal of the non-contact type seal with helical grooves for a housing and a shaft, comprising means for introduction of an external barrier fluid towards the sealing interface. Said barrier fluid prevents sealed process fluid from entering past the sealing interface, thus providing sealing means for hazardous or repugnant fluids.

Abstract: A sealing assembly for a rotatable shaft, comprising means to generate pressure differentials and temperature through pumping action and means to seal fluid, for example of the non-contact helical groove type. Sealing means are positioned outboard of pumping means. Fluid in liquid form is heated and depressurized on passage through pumping means of vortex or viscous shear type, thereby changed from liquid to gas. Gasified fluid is then sealed by sealing means for low leakage operation.

Abstract: A shaft seal device is provided which is capable of sealing a rotary shaft in a positive and reliable manner without requiring a periodical lubricant-supplying operation, and is free from contamination of its environment, products, etc. by splashing of excess lubricant leaking from the oil seal lip. An annular sealing channel is formed in at least one of the opposite ends of a housing of a bearing unit, in which is accommodated an annular lubricant-bearing polymer member fitted on the rotary shaft. The polymer member has an inside diameter substantially equal to an outer diameter of the rotary shaft at an initial stage of rotation of the rotary shaft. The polymer member has at least part of opposite end surfaces or outer peripheral portion thereof disposed substantially in contact with opposite lateral wall surfaces of the sealing channel.

Abstract: A seal suitable for a driveshaft of a pump for cryogenic media. The seal can operate without extraneous confining gas, runs frictionless and assures a long service life, which was unattainable so far. The seal is designed as a tandem axial face seal. A sliding ring has sliding faces on both sides with spiral-shaped grooves terminating at an outer periphery, and the sliding ring is fixedly mounted on a driveshaft. The sliding faces each is adjoined by a sliding ring. The sliding ring is tightly connected via a metal bellows with the housing cover on the pump side, and the sliding ring via the metal bellows with the housing cover on the motor side. With the tandem axial face seal, the pump process pressure is sealed with respect to atmospheric pressure, and only a small, controlled gas leakage occurs. The process gas remains 100% pure.

Abstract: A non-contact-type mechanical seal that keeps a rotary seal ring 6 from vibrating in what is called a pneumatic hammer fashion. For this purpose, an annular space 23 is formed between an outer circumferential surface 21a of the rotary seal ring 6 and an inner circumferential surface 13a of a holder portion 13 of a spring retainer 5. The annular space 23 is sealed by a pair of O rings 22, 22. In addition, seal gas leading passages 24 are provided in the rotary seal ring 6 through which spaces between seal end faces 3a, 6a communicate with the annular space 23. Seal gas 8 is supplied to static pressure generating grooves 15, and led into the annular space 23 through seal gas leading passages 24. The seal gas presses O rings 22, 22 against the outer circumferential surfaces of the rotary seal ring 6 and the inner circumferential surface of the holder portion 13 of the spring retainer 5, thereby firmly holding the rotary seal ring 6.

Abstract: A rotary ring has a seal end face located at an end of the axial line direction thereof perpendicularly to the axial line and an anti-seal end face located at the other end thereof in the axial line direction, wherein the seal end face and the seal end face of a fixed ring slide each other through a subject to be sealed. The cross-sectional shape of the rotary ring is made asymmetric with respect to right and left by forming a step around the outer peripheral portion thereof so that the center of gravity of the rotary ring is located at a position nearer to the anti-seal end face than the center of the plate thickness thereof. With this arrangement, the convex deformation made to the seal end face by the deformation of the rotary ring due to heat is canceled by the concave deformation made to the seal end face by a large amount of centrifugal force acting on the anti-seal end face. Accordingly, the rotary ring exhibits a stable sealing property.

Abstract: A face seal device for use with components rotating at a high rotational speed includes a non-rotating face seal ring (5) and a rotary face seal ring (11) mounted in a loose fit on and rotatable together with the rotary component. The rotary face seal ring includes a sealing face (6) which, in operation, is essentially radially aligned for cooperation with an opposite sealing face (16) of the non-rotating face seal ring. The rotary face seal ring is formed of at least a base portion (20) and an extension portion (21). The extension portion provides an additional mass and has an areal center of gravity axially spaced from the areal center of gravity of the base portion An axial spacing z between the areal centers of gravity and the mass m of the extension portion are in specific relationship with each other, whereby in operation a torque directed towards the non-rotating face seal ring is applied to the rotary face seal ring.

Abstract: A mechanical seal for providing a seal around the drive shaft of a variable displacement swash plate type compressor used in an air conditioning system for a vehicle comprising a rotating bearing surface, an associated stationary bearing surface and a lubricant embedded in the stationary bearing surface. During operation of the compressor, the rotating bearing surface is caused to move against the stationary bearing surface causing lubricant to be released between the bearing surfaces, thereby providing efficient lubrication of the bearing surfaces.

Abstract: A real wheel is fitted directly to the brake drum, and cooling fins are provided at the outer surface of the brake drum for dissipating heat. A seal member is fitted to an open edge of the brake drum, and an L-shaped plate for mating with lips of the seal member is fitted to the brake base section attached to the side of the vehicle. A brake shoe is then housed in a space formed between the brake base section and the brake drum. With this arrangement, the number of parts can be reduced compared with the related art. Also, the width of the vehicle can be reduced compared with, for example, fitting a wheel to a hub provided separately from a drum. The drum brake can be housed within the wheel, and the vehicle can be made lightweight. Heat dissipation for the drum brake can also be improved.

Abstract: A lubricated hydrostatic seal comprising (a) surface regions having opposing surfaces; (b) a plurality of micropores in one or more of said surfaces having a pore geometry; and (c) a flow of fluid between said surfaces, wherein said flow of fluid past said micropores provides a lifting force between said surfaces. In a preferred embodiment, the opposing surfaces of the surface regions are nominally parallel. Nominally-parallel surfaces are simple to manufacture and are considerably less expensive than the various converging-surface configurations of the prior art. The nominally-parallel surface configuration can also be utilized in both liquid-lubricated and gas-lubricated hydrodynamic seal applications, and in hybrid-seal applications in which both hydrodynamic and hydrostatic lift are generated.

Abstract: A radial-piston pump has at least one delivery unit with a delivery element. A pump casing is provided which has a first accommodation space for a medium to be delivered and a second accommodation space for a lubricant, the pump casing further has an eccentric side and a casing side. A separating device separates the first accommodation space and the second accommodation space from one another. The separating device has a first sealing element disposed fluid-tightly on the casing side of the pump casing and a second sealing element disposed on the eccentric side and connected fluid-tightly with the first sealing element. A shaft bearing configuration is disposed in the pump casing and supports an input shaft having an end portion. An eccentric element is disposed on the end portion of the input shaft. The second sealing element is disposed so as to be capable of sliding in a circumferential direction of the eccentric element.

Abstract: A mechanical end face seal includes one seal ring having two elements, a seal face extension portion immediately adjacent a sealing face and a seal ring body removed from the sealing face. Each of the ring elements has a radial outer diameter dimension and a radial inner dimension. The seal face extension portion is defined by an annular gap separating the seal ring body from the seal face extension portion. The annular gap opens out onto the high-pressure side of the seal. The axial thickness of the seal face extension portion is much smaller than the radial dimension of the sealing face. The seal face extension portion is connected to the thicker seal ring body by means of a thin connecting “neck”, which has a small radial dimension than the radial dimension of the sealing face. Preferably, the radial dimension of the neck has a ratio relative to the radial width of the ring sealing face between about 0.10 to about 0.70, more preferably about 0.25 to about 0.60, and most preferably about 0.

Abstract: A drum brake includes a brake drum attached to an axle, and a brake panel. The brake drum includes a disc portion and a cylindrical portion extending from an outer peripheral end portion of the disc portion towards the brake panel. On an outer peripheral end portion of the cylindrical portion, there is mounted a seal member. The brake panel includes an annular flat surface portion, and a cylindrical projecting portion projecting from an outer peripheral end portion of the annular flat surface portion towards the brake drum so as to surround the seal member. The seal member has plural resilient axial sealing lips and at least one resilient radial sealing lip. The axial sealing lips are in sealing contact with the annular flat surface portion, and the radial lip is in sealing contact with an inner peripheral surface of the cylindrical projecting portion.

Abstract: The invention provides an improved rotating seal apparatus including a plurality of concentrically spaced annular rotating seals. The invention also provides a rotating seal apparatus including a pressurized annular chamber surrounding an annular rotating seal.

Abstract: An improved seal for defining a back pressure chamber in a scroll compressor includes a tab extending toward the rear face of the orbiting scroll. The tab reduces the contact force created against the rear face of the orbiting scroll by the gas pressure in the back pressure chamber. Thus, the inventive seal increases seal life.

Abstract: A bearing seal includes a bearing housing which houses a rotatable shaft, with a flange of the shaft located outside the housing and an internal annular volume residing between the bearing housing and the shaft, the annular volume bounded at one axial end by the flange. A seal resides in a recess in an outer surface of the housing, the seal including an outwardly extending resilient lip which engages the flange to close off the annular volume at the first axial end, adjacent the flange. The bearing housing includes a fluid passage which extends from an outer surface thereof to the annular volume, the passage including an innermost section oriented tangential to the annular volume. Purge fluid supplied to the annular volume via the external passage causes circumferential flow and substantially radially uniform purge fluid pressure within the annular volume.

Abstract: The invention relates to a non-contacting shaft seal formed between a rotating sealing ring (3) and a non-rotating circular sealing element (1). The sealing element (1) is spring-loaded towards the sealing ring (3). Gas is pumped into spiral grooves (6) formed in the sealing face (5) of either the sealing ring (3) or the sealing element (1) and extending from an edge thereof during rotation of the sealing ring (3) and a gap (S) is created between the sealing element (1) and the sealing ring (3) against the force of the spring. Each groove is divided into two channels by a wedge-shaped partition (7) extending from the end wall of the groove (6). During speed changes of the rotating sealing ring (3), the gap (S) is maintained by high pressure at the closed end of the channels. The partition (7) is designed to offer little resistance to gas flow in the channel.

Abstract: A double gas pressure seal 10 is provided for sealing between a stationary housing 14 and a rotary housing 26. The gas pressure seal includes a stationary ring 42 and a rotary ring 40 each having a radially inner sealing face and a radially outer sealing face. A biasing spring 56 biases one of the rings toward the other ring. An annular groove 68 is provided in one of the rings, with the groove being spaced between the radially inner sealing faces and radially outer sealing faces. A supply port 84 supplies pressurized gas to the annular groove at a pressure higher than the process fluid in the stationary housing. A plurality of radially inner and radially outer recesses 94, 96, 122, 124 are provided on the one of the rings, and corresponding feed channels 98, 100, 126, 128 fluidly interconnect the annular groove with a rotary leading portion of each respective recess.

Abstract: A seal ring mountable to a rotating member for rotation therewith, the seal ring including a gap or other feature providing controlled leakage therethrough, a radial inner circumferential face, an opposite radial outer circumferential face, and at least one axial end face extending between the inner circumferential face and the outer circumferential face, wherein at least one face includes elements for receiving and holding a lubricant for providing lubrication between the face and a surface located in opposing relation thereto during rotation of the seal ring relative to the surface.

Abstract: In order to ensure that the working life of the sealing device is at least comparable to that of the remaining parts of the crawler track, the resilient annular element comprises a first annular portion and a second annular portion. The first annular portion has a cross-section in the form of a bulge, while the second annular portion has a cross-section in the form of a boss. The first annular portion is delimited by an annular contact surface which, when the annular seal is assembled, but not mounted in its seat, forms together with the incident joining plane of the rigid annular sealing element, an angle “&agr;” of between 0° and 30°.

Abstract: The present invention provides a face seal with spiral grooves comprising: a rotating ring including a sealing face; a stationary ring including a sealing face; the face is confronted with the face of the rotating ring to form a circular interface having a circle center; the faces of the rings can rotate relatively to each other; two spiral groove sets are provided at least on one of the faces of the rotating and the stationary rings, wherein one set disposed on the high pressure side, i.e. at the upstream, and the other set disposed on the low pressure side, i.e. at the downstream; the spiral angles of these two spiral groove sets are opposite to each other; the radial length of an upstream spiral groove is greater than that of a downstream spiral groove; and an annular flat belt is further provided at the downstream of the downstream spiral groove set.

Abstract: Properties of mechanical bearings and mechanical seals can be significantly improved by covering the load-bearing surfaces with fields of high aspect ratio microstructures (HARMs), such as microchannels or microposts. The HARMs can substantially enhance heat transfer capability and lubricant flow. The present invention uses microstructures and micro-channels manufactured by a modified LIGA process to enhance the performance of load bearing surfaces. Benefits include reduced operating temperatures, precise metering of lubricant flow to all affected surfaces, increased reliability, increased life, higher maximum rotational speed, and the ability of the seal or bearing to run "dry," that is, without periodic re-application of lubricant.

Abstract: A high pressure boundary seal adjacent at least one of the bearings of the spindle motor. The motor itself includes a shaft, typically a fixed shaft and a rotor supported by bearings and rotating outside the shaft. The high-pressure boundary seal comprises a ring which surrounds the shaft across a small gap and is supported from and rotates with the rotor or hub. In a first embodiment, a herringbone pattern is defined on the inner surface of the ring or the outer surface of the shaft. The upper and lower sections of the herringbone pattern are substantially equal so that a zone of high pressure is established at about the center of the pattern. This high pressure boundary zone prevents the flow of any contaminants from the interior of the motor or the bearing between the shaft and the sealing ring out into the interior section of the disc drive housing where they could potentially contaminate the disc.

Abstract: A seal is provided having a back surface that is generally perpendicular with a longitudinal axis of the seal and a sealing portion on the side opposite the back surface. The sealing portion is defined by first and second intersecting surfaces. A plurality of projections are disposed on one of the first and second surfaces at a location generally adjacent the intersection of the surfaces and a cylindrical recess is defined in at least a portion of the plurality of projections. The sides of the cylindrical recesses and the plurality of projections are oriented perpendicular to the back surface to enhance the ability to manufacture the seal in an economical manner.

Abstract: A static pressure-type generating non-contact gas seal in which a diameter d2 of a second outer circumferential portion (42) of a stationary seal ring (4) in contact with a second O-ring (62) is made smaller than the diameter d1 of a first outer circumferential portion (41) of the stationary seal ring (4) in contact with a first O-ring (62). Because of d1>d2, the pressure of a seal gas (8) led to a first closed space (71) produces a force thrusting the stationary seal ring (4) toward a rotary seal ring (2). A second closed space (72) communicates with an inside region (F) through a back pressure lead-in path (45). The inside gas pressure in the second closed space (72) acts as back pressure on the stationary seal ring (4). The groove width b of static pressure generating grooves (9) formed on the seal end face of the stationary seal ring (4) is decided so that a ratio of the groove width d to the radial width, that is, the seal face width B of the stationary seal ring end face (40), i.e. b/B, is 0.05.

Abstract: A split mechanical face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal face. The seal ring faces of the seal rings are opposed to one another. One of the seal rings is connected to the rotating shaft to rotate therewith, while the other seal ring is connected to the housing. The split seal also includes a continuous, circumferential groove formed in the seal face of the first seal ring for introducing a fluid to the seal faces of the first and second seal rings to establish a seal therebetween. A split support member having at least two support segments for coupling the first seal ring to the housing or the rotating shaft is also provided. The split face seal is operable as both a contacting and a non-contacting mechanical face seal.

Abstract: A contact surface of a seal having textured features is described. The contact surface seals properly and is resistant to wear. The contact surface is able to perform in very severe environments, such as those found in earthmoving applications.

Abstract: In a metal to metal face seal assembly, a metal ring seal has a J-shaped cross-section with the hook portion of the ring seal forming an annular notch which receives and restrains a resilient load ring.

Abstract: A split mechanical face seat that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal surface. The seal ring surfaces of the seal rings are opposed to one another. One of the seal rings is connected to the rotating shaft to rotate therewith, while the other seal ring is connected to the housing. The split seal also includes a mechanism for introducing a fluid to the seal surfaces of the first and second seal rings. The seal further is provided with a system for fluidly retaining together the seal ring segments of one of the seal rings in a sealing relationship during a negative pressure condition.

Abstract: A split mechanical face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal surface. The seal ring surfaces of the seal rings are opposed to one another. One of the seal rings is connected to the rotating shaft to rotate therewith, while the other seal ring is connected to the housing. The split seal also includes a mechanism for introducing a fluid to the seal surfaces of the first and second seal rings. The seal further is provided with a system for maintaining co-planar alignment of the seal faces.

Abstract: A split face seal that provides fluid sealing between a housing and a rotating shaft includes first and second seal rings each having at least two seal ring segments and a radially extending seal face. The seal ring faces of the seal rings are opposed to one another. One of the seal rings is connected to the rotating shaft to rotate therewith, while the other seal ring is connected to the housing. The split seal also includes a mechanism for introducing a fluid to the seal faces of the first and second seal rings and a split support member having at least two support segments for radially supporting the first seal ring to inhibit radial separation of the seal ring segments of the first seal ring.