Abstract: An annular scraper ring for a packing arrangement is disclosed. The annular scraper ring that can form a seal with a plunger included in a fluid end of a reciprocating pump and includes a planar upstream face and an inner surface with a tapered section. The tapered section tapers away from the plunger along a downstream direction so that the scraper ring is widest at the planar upstream face.

Abstract: A seal assembly for sealing a grease lubricated large rolling-element bearing includes a radial shaft seal having at least one seal lip configured to sealingly abut against a shaft to seal a bearing interior and substantially prevent a grease discharge from the bearing and a grease flow regulation device, such as an annular pumping ring, for regulating a grease pressure at the at least one seal lip, the grease flow regulation device being mounted adjacent to the radial shaft seal at a side of the radial shaft seal that is intended to face the bearing interior in an installed state.

Abstract: A guide for a piston of a high-pressure pump includes: an upper body and a lower body, a connection part integrally connecting the upper body and the lower body, and a seal molded by an insert injection between the upper body and the lower body while surrounding the connection part. A gap exists between the upper body and the lower body, and the piston and the seal are in close contact with a piston. Therefore, it is possible to prevent leakage of fuel even while securing motion performance of the piston.

Abstract: A vehicle fitted with a steering device including a steering mechanism protected by a steering casing, the steering casing itself being housed in an engine compartment that is separated from the interior of the vehicle by a dashboard, the steering device also including a steering wheel, located in the interior, and to which the steering mechanism is connected by a steering column that extends out of the steering casing and passes through the dashboard, the vehicle including, in order to provide a seal around the steering column, between the steering casing and the dashboard, an elastomeric coupling gasket including, in a single piece, a central first sealing ring that surrounds and clamps around the steering column and a peripheral second sealing ring that is inserted between the steering casing and the dashboard, at a distance from and around the first sealing ring.

Abstract: A piston rod and a rod cover which constitute this hydraulic cylinder are configured from aluminum or an aluminum alloy. An alumite coating film is formed on at least a part of the inner wall surface of the rod cover that constitutes a rod insertion hole, and a diamond-like carbon coating film is formed on the outer wall surface of the piston rod, said diamond-like carbon coating film being in sliding contact with the alumite coating film.

Abstract: In a sealing structure, a sealing device seals a space between a rotational body and a shaft. The sealing device includes an inner side seal portion, an outer side seal portion, and a dust cover. An inner side seal lip of the inner side seal portion extends from an inner side attachment ring toward an outer side and slidably abuts a contacted portion. The outer side seal portion includes the outer side seal lip, and a side lip on an outer peripheral side of the outer side seal lip, and the outer side seal lip and the side lip extend from the outer side attachment ring toward the outer side and slidably abut the dust cover. The dust cover forms a gap between the dust cover and a flange portion of a bracket to which the inner side attachment ring is attached.

Abstract: A well tool can include inner and outer seals interposed between components of the well tool, and a circumferential spacer which prevents contact between the inner seal and one of the components which displaces relative to the inner seal. A method of sealing between components of a well tool can include sealingly engaging an outer seal between the components, and disposing an inner seal between the components, including spacing the inner seal away from one of the components, whereby the inner seal sealingly contacts one of the components only after the well tool is disposed in a well. A drill bit can include inner and outer seals interposed between components of the drill bit, and a circumferential spacer which prevents contact between the inner seal and one of the components, the circumferential spacer being positioned upstream of the outer seal relative to a lubricant supply of the drill bit.

Abstract: A sealing device between a shaft hole formed on a housing and a rotary shaft, is provided with a rotating seal member fixed to the rotary shaft that rotates integrally with the rotary shaft, and a fixed seal member fixed to an inner surface of the shaft hole. The fixed seal member has a lip contacting the rotary shaft and an axial dust lip contacting the rotating seal member. The rotating seal member is formed by a rigid body, and an opening is formed on the rotating seal member connecting to a space defined by the rotary shaft, the lip and the axial dust lip of the fixed seal member, and the rotating seal member. A deformation member is disposed on the opening of the rotating seal member that has higher elasticity than the rotating seal member, which blocks the opening, and deforms based on the pressure in the space.

Abstract: A rolling bearing includes an outer race, an inner race, rolling elements mounted between the outer race and the inner race, and a seal ring formed with an oil passage hole and covering at least one of the axial end openings of the bearing space of the bearing. A filter is mounted to the seal ring so as to cover the oil passage hole of the seal ring, and is configured to catch foreign matter contained in lubricant oil, and a magnetic member is mounted axially inwardly of, and adjacent to, the filter, and is configured to attract foreign matter to the magnetic member due to the magnetic force of the magnetic member.

Abstract: A seal includes an annular mounting portion having an axial leg extending axially from the annular mounting portion toward the air side. A radial leg portion extends radially inward from an end of the axial leg. A lay down sealing lip extends radially inward and axially toward the oil side from an end of the radial leg portion. A dust lip extends from the end of the radial leg portion in a direction opposite the lay down sealing lip. When the oil side is under negative pressure and when the lay down sealing lip begins to lift radially off the shaft, there is a counterbalance force applied to the axial leg that is designed to be flexible enough that the oil side vacuum “rocks” the seal bringing the dust lip into contact with the shaft and blocking airflow.

Abstract: A radial shaft sealing ring for the sealing separation of an internal space (6), from an external space (5), with a sealing lip (2) delimited by a first and a second annular surface (3, 4) of a cone frustum, wherein, the first annular surface (3) is oriented towards the external space (5), and the second annular surface (4) is oriented towards the internal space (6), wherein the annular surfaces (3, 4) are connected to each other via a ring-shaped contact surface (23) of the sealing lip (2), which rests on the shaft (7), wherein the first annular surface (3) forms with the shaft (7) a first angle (??) of 23-40° in the installed position, wherein an inner diameter (24) of the ring-shaped contact surface (23) is 1-15 mm in the installed position.

Abstract: A tire inflation system that includes a seal. The seal may have an annular mounting portion and an annular lip portion. The annular lip portion may have a sealing side and a non-sealing side. Leakage of pressurized gas may be inhibited when the sealing side faces away from the annular mounting portion. Leakage of pressurized gas may be enabled when the annular lip portion is rolled such that at least a portion of the sealing side faces toward the annular mounting portion.

Abstract: An airtightness maintaining structure for a butterfly valve includes a valve element having a rotating shaft and a valve body, a rotation supporting portion having a pivotably supporting member that fits onto the rotating shaft and pivotably supports the rotating shaft, and a rotating shaft seal arranged to contact in a fitting state both an end surface of a member on an outer radial and a surface of a member on an inner side either the rotation shaft or the pivotably supporting member and has an annular portion. In a closed valve state of the valve element, the rotating shaft seal moves radially due to a pressure difference between a high fluid pressure acting on one side of the valve element and a low fluid pressure acting on the other side and contacts both the valve element and the rotation supporting portion on the high fluid pressure side.

Abstract: A radial shaft seal for separating two media includes two radial shaft sealing rings each including an axial surface and a sealing lip. The sealing rings are disposed with the axial surfaces facing one another and the sealing lips axially opposed to one another with a space between the sealing lips including a vent. At least one of the sealing rings includes clamping cams configured to grip an inner rim of the other sealing ring so as to join the sealing rings in a form-locking, rear-engaging position relative to each other.

Abstract: A lip-type seal shaft seal device equipped with a lip seal for sealing a rotary member and a stationary member concentrically disposed to the inside and outside in a radial direction, has a plurality of aeration-creating parts for creating aeration through relative rotational sliding of the lip seal and the rotary member, formed in separated fashion in the circumferential direction on the outside peripheral surface of the rotary member. The aeration-creating parts are configured from a plurality of fine grooves arranged in the circumferential direction, extending along the axial direction of the rotary member. The lip of the lip seal extends towards the outside atmosphere side, leaving a portion of the aeration-creating parts at the sealed fluid side in the axial direction.

Abstract: A seal system for a reciprocating cylinder includes a buffer seal, a rod seal, and a wiper seal. The buffer seal includes a dynamic seal lip and a static lip extending from a hinge portion. The hinge portion of the static lip allows fluid to escape past the outer diameter of the seal when the rod is retracted thereby releasing any pressure build-up between the rod seal and buffer seal. The axial face portion of the dynamic seal lip includes axially extending notches therein. The notches prevent the buffer seal from sticking to the axial wall of the groove and provide a consistent path for the fluid to energize the annular groove between the static and dynamic lips during the extension phase which is necessary for the function of the seal. The back-up ring is an integrated part of the buffer seal, used to provide superior extrusion resistance.

Abstract: An annular seal member configured to seal a gap between a shaft hole and a shaft inserted into the shaft hole, the annular seal member comprises: an annular base part; an annular lip, which includes a lip edge that is configured to be contact with one of a hole face of a shaft hole and an outer periphery of a shaft, the one of which is a seal mating face; a first convex part, a second convex part and a passage recess, which is provided at a face of the base part facing the seal mating face; a concave part, which is formed at a position between the second convex part and the base end portion of the annular lip, and which has a circumferential size larger than a recess width of the passage recess.

Abstract: A lip seal-type shaft seal device that exhibits no leakage when at rest; operates under fluid lubrication and prevents leakage when rotating, including during initial rotation; and enables a balance between seal integrity and lubrication is provided. The device includes a plurality of discontinuous pumping areas for generating pumping action via the relative rotational sliding of a lip seal and a rotating member is formed in the circumferential direction on the outer circumferential surface of the rotating member. The plurality of pumping areas is provided with suction portion of pumping areas operating in a direction in which a sealed fluid is drawn in and discharge portion of pumping areas operating in a direction in which the sealed fluid is expelled. A lip of the lip of the lip seal extends in an axial direction towards an atmosphere side, leaving part of the pumping areas uncovered on a sealed fluid side.

Abstract: A lip type end face sealing device having excellent sealability to different kinds of liquids on both sides in the axial direction and having excellent durability. A case is tight fitted to an inner peripheral face of a housing and includes case members. One pair of seal lips is integrally fitted to inner peripheral flange parts, positioned oppositely each other in the axial direction, and opened in a tapered shape. One pair of the seal lips is slidably contacted with flange parts of slingers tight fitted to an outer periphery of a rotary shaft. Pressure in seal internal spaces between the seal lips is released through a vent hole.

Abstract: To improve durability of a seal lip (4) of an oil seal (1) in slidably contact with the peripheral surface of a shaft (23), a lubricating oil supply section (11) for collecting adhered oil and dropping it on the shaft (23) is provided at a forward end portion of an installation section (2), the lubricating oil supply section (11) has projections (12) formed on the inner peripheral surface of the installation section (2) to collect oil on the surface thereof, the surface of each projection (12) has a recess (13) for temporarily accumulating oil, guidance projections, or a slope for collecting the oil, and dams are formed on a forward end face (2a) of the installation section (2) to block the oil flowing down along the circumferential direction on the forward end face (2a) and guides the oil toward each projection (12).

Abstract: A radial shaft seal and assembly are provided. The seal has an annular mounting portion and a seal body bonded thereto. The seal body extends to a seal lip extending between an oil-side end and a free air-side end. An annular bridge extends between the seal lip and a central portion of the seal body in radially overlying relation to the seal lip. A primary dust lip extends from the air-side end and has an annular rib configured for sealed abutment with a running surface of a shaft. The annular rib has at least one vent. An auxiliary dust lip extends from the central portion of the seal body to a free end configured for sealed abutment with the shaft. The free end of the auxiliary dust lip has at least one vent spaced circumferentially from the at least one vent in the annular rib.

Abstract: A sealed, single row angular contact ball bearing which has a seal arranged at both axial ends in a region of the rims. One bearing ring has on both sides one receiving opening for the sealing lip carrier and the associated other bearing ring has on both sides one sealing face for the sealing lip. The rims are coordinated with one another in such a way that receiving openings and sealing faces lie in one plane at the same radial spacing from a bearing axis. It is ensured in this way that the same seal can be used for sealing the angular contact ball bearing of generic configuration on both sides.

Abstract: A seal for sealingly engaging a shaft or other rotatable element includes a sealing portion having a lubricant side and a non-lubricant side and extending generally inwardly toward the shaft when the seal is installed thereon. The sealing portion has an active lip portion including a shaft engagement surface engageable with the shaft and a lubricant vent extending through at least a portion of the active lip portion. The lubricant vent provides fluid communication between opposite sides of the active lip portion, thus maintaining adequate lubrication between the shaft engagement surface and the shaft, avoiding lubricant coking, or other degradation, and extending seal life.

Abstract: In a sealing system (1) between two mutually moving components (2, 3) for sealing a high pressure side (H) with respect to a low pressure side (N), a sealing configuration (9) is provided in a first annular groove (4) at the high pressure side and with one or more pressure relief elements (10a, 10b) being disposed in second annular grooves (14a, 14b) each pressure relief element (10a, 10b) having a second sealing ring (15a, 15b) with a flat pressure gradient. The hydrodynamic leak rate for each pressure relief element (10a, 10b) is chosen in such a fashion that a certain hydraulic pressure obtains in each intermediate region (Za, Zb).

Abstract: A sealing assembly for a shaft includes: a first sealing component; a first spring energizer associated with said first sealing component; an annular support member configured for supporting said first sealing component; a second sealing component; a second spring energizer associated with said second sealing component, said first and second sealing components each having a pair of seal lips, said pairs of seal lips facing each other, said first and second spring energizers each configured for energizing respectively said first and second sealing components, each said spring energizer being respectively between one said pair of seal lips, said annular support member being disposed about the shaft and positioned between said first and second sealing components and said first and second spring energizers, said annular support member including two outwardly facing protuberances each of which interfits with a respective said pair of seal lips.

Abstract: A sealing device is constructed by a seal ring and a back ring, the back ring is constructed by a lip packing provided with an inner lip and an outer lip in one end portion in an axial direction of an annular base portion, and is provided with an annular protrusion for setting a diametrical direction compression margin in the back ring in an outer peripheral surface of the annular base portion. The outer lip has a function of sealing the sealed fluid by coming into close contact with the cylinder and releasing the accumulated pressure by being pushed by a pressure at a time of a pressure accumulating phenomenon in the another space in the axial direction so as to be spaced from the cylinder. The annular protrusion is provided with a flow path for introducing the accumulated pressure to the outer lip.

Abstract: A valve stem seal can include an elastomeric component having a first portion for having a sealed engagement with a valve stem, and a pressure relief lip engaging a valve guide. The pressure relief lip can have a sealing configuration and a venting configuration. The venting configuration can allow excess exhaust gases to vent from a combustion chamber. After the venting of excess exhaust gases, the pressure relief lip can close to the sealing configuration to prevent oil from entering the combustion chamber. The elastomeric body or the valve guide can include a pressure relief channel. The elastomeric body can also include a bumper engaging the valve guide. The pressure relief channel can be disposed in the bumper.

Abstract: A joint seal of a constant velocity universal joint which has a sealing effect relative to a shaft journal includes an axial securing sleeve which is connected to the inner joint part and which ends in individual axial fingers which radially elastically engage an annular groove in the shaft journal, wherein the ventilation channels for the joint interior of the constant velocity universal joint are formed by axial slots between the individual axial fingers which freely end in the interior of the rolling boot and can be closed towards the outside of the rolling boot by a sealing lip which is formed on to the rolling boot, which, in the position of rest, annularly sealingly contacts the shaft journal and which, at an increased speed, lifts off the shaft journal to expose the ventilation channels.

Abstract: A sealing assembly for a shaft includes a sealing component, a first ring, a second ring, and at least one energizer. The first ring is annularly disposed about the shaft, the first ring having at least one first protuberance interfittable with the sealing component. The second ring is annularly disposed about the shaft in facing opposition to the first ring, the second ring having at least one second protuberance interfittable with the sealing component. The at least one energizer energizes the seal component, the at least one energizer being adjacent the at least one first protuberance or the at least one second protuberance.

Abstract: A seal is provided comprising at least two sealing lips including a first sealing lip and a second sealing lip being arranged in series. A sealing system is provided which ensures a problem-free operation with a long service life at the same time. The seal is characterized in that the sealing lips are made of different materials. A system, which includes such a seal, is assigned to a rotatable shaft and at least two sealing lips seal off two spaces against each other.

Abstract: A seal is disclosed, for sealing a seal surface (5) between two machine parts (6, 7) which move relative to each other, wherein a seal body of the seal (1) comprises a retainer piece (10), arranged towards the groove base in a groove (8) in one of the machine parts (7), a sealing part (11), arranged in the groove (8) facing the sealing surface and a resilient connector part (12) between the sealing part (11) and the retaining part (10). The seal (1) has a recess (21) between the retainer part (10) and the connector part (12) and a further recess (20) between the connector part (12) and the sealing part (11). The seal (1) has spacer elements (25), said spacer elements (25) extending into at least one of the recesses (20, 21), preferably at least into the recesses (20) between the sealing part (11) and the connector part (12).

Abstract: A check seal (53) for discharging working oil scraped off a piston rod (3) by an oil lip (52b) into an oil pool (A) of a hydraulic shock absorber to an oil reservoir (R) is disposed on the outside of the oil pool (A). The check seal (53) comprises an annular seat surface (4d) and an annular lip (53a) seated resiliently on the seat surface (4d). The annular seat surface (4d) comprises an annular main rib (11) and an annular inner rib (12), both of which project toward the annular lip (53a), such that an annular groove (21) is formed between the main rib (11) and the inner rib (12). By providing a pressure introducing passage (12a) to introduce a pressure inside the inner rib (12) to the annular groove (21), the check seal (53) exhibits a high working oil discharging performance and a high working oil sealing performance.

Abstract: The seal for sealing off the bearing interior of a bearing has a first sealing lip angled outward from a base of the seal and forming a first sealing contact, and a second sealing lip angled inward from the base and forming a second sealing contact. An annular chamber is formed between the first sealing lip and the second sealing lip. The first sealing lip has at least one ventilation opening which leads into the chamber from the outside. The ventilation opening is positioned at the first sealing contact.

Abstract: A shaft sealing device includes a seal assembly equipped with a fitting part having a fitting surface hermetically fittable within a hole defining surface of a housing and a rubber elastomer first seal lip extending inward from the fitting part and having a seal surface which seals a fluid inside an internal boundary thereof. A seal sleeve made of metal or resin material is equipped with a slide seal surface that is in slidable contact with the seal surface of the first seal lip. A concave rotor surrounds a seal surface region defined at a longitudinal end of the slide seal surface, and includes a close-contact fitting surface that is hermetically fitted to a rotary shaft. A discharge port defined by the rotor facilitates the sealed fluid being pushed back to the rotor in a direction extending away from the seal surface region.

Abstract: An air swivel ring includes a non-rotating member having an air inlet, a rotating member having an air outlet, and a split seal having a first sealing surface and coupled to one of the non-rotating member and the rotating member so that the first sealing surface on the seal is disposed proximate a second sealing surface on the other of the non-rotating member and the rotating member.

Abstract: Water-tight battery powered appliances, for example personal care appliances such as razors and toothbrushes, are provided. The appliances include a housing having a seal that allows gases, e.g., hydrogen, to vent from the appliance without allowing water to enter.

Abstract: To stabilize frictional force to the reciprocating shaft without affecting sealing ability, a sealing device for a reciprocating shaft comprises a main lip 11, a whole periphery of which slidably and tightly contacts with an outer peripheral surface of a shaft 2 reciprocating in the axial direction; and a frictional lip 13, which extends to the sealed space A side from the main lip 11 and slidably and tightly contacts with the outer peripheral surface of the shaft 2 in the state of permitting circulation of sealed fluid, whereby the frictional force of the frictional lip 13 is not varied by pressure of the sealed fluid, while frictional force of the main lip 11 to the shaft 2 is varied by the pressure, the sliding surface is lubricated with the sealed fluid, and reduction of the frictional force by abrasion can be controlled.

Abstract: An objective of the present invention is to provide a lip type end face sealing device 6 having excellent sealability to different kinds of liquids on the both sides in the axial direction and having excellent durability. A case 61 tight fitted to an inner peripheral face 2a of a housing 2 comprises case members 611 and 612. One pair of seal lips 62 and 63 is integrally fitted to inner peripheral flange parts 611b and 612b, positioned oppositely each other in the axial direction, and opened in a tapered shape. One pair of the seal lips 62 and 63 is slidably contacted with flange parts 64b and 65b of slingers 64 and 65 tight fitted to an outer periphery of a rotary shaft 3. Pressure in seal internal spaces S2 between the both seal lips 62 and 63 and the both slingers 64 and 65 is released through a vent hole 22 opened on the inner peripheral face 2a of the housing 2, an air hole 611c opened on the case 61, and between the case members 611 and 612.

Abstract: A hydraulically balanced radial seal is configured so that the hydraulic pressure of the fluid being sealed causes the primary dynamic sealing lip to be axially stretched longer and also incorporates a secondary static sealing lip whose beaded interior locks into a receiving groove in the exterior surface of the dynamic sealing lip and effects a seal between the two lips. The secondary static sealing lip being so disposed as to cause it to be compressed and shortened by the hydraulic pressure of the fluid being sealed an amount comparable to that which the primary dynamic sealing lip is being stretched under the same pressure, keeping the two lips locked together. This unique construction maintains the favorable hydraulic balance initially designed into the seal, enabling it to accommodate hydraulic pressures of over 225 psi.

Abstract: The plug-type coupling includes a molded sealing ring for producing liquid-tight or gas-tight connections, the plug-type coupling having a socket and a plug that can be axially plugged into each other, and the molded sealing ring being implemented as a lip seal disposed in a circumferential groove of the plug. The object is to further develop a plug-type coupling including a molded sealing ring of the above type in such a way that a pumping effect is prevented, in order to thus prevent a vacuum on the groove bottom during pulsating stresses on the plug-type coupling.

Abstract: An air swivel ring includes a non-rotating member having an air inlet, a rotating member having an air outlet, and a split seal having a first sealing surface and coupled to one of the non-rotating member and the rotating member so that the first sealing surface on the seal is disposed proximate a second sealing surface on the other of the non-rotating member and the rotating member.

Abstract: A compressor may include a housing, a compression mechanism supported within the housing, and a seal assembly. The housing may include a suction pressure region and a first discharge passage in communication with a discharge pressure region. The compression mechanism may include a second discharge passage in communication with the first discharge passage. The seal assembly may be sealingly engaged with the housing and the compression mechanism to define a chamber and to provide sealed communication between the first and second discharge passages. The seal assembly may include a seal member engaged with the compression mechanism and including a leg having an opening therein. The leg may isolate the chamber from the discharge pressure region when in a first position and may provide communication between the chamber and the discharge pressure region through the opening when in a second position different than the first position.

Abstract: Water-tight battery powered appliances, for example personal care appliances such as razors and toothbrushes, are provided. The appliances include a housing having a seal that allows gases, e.g., hydrogen, to vent from the appliance without allowing water to enter.

Abstract: By providing a projection 24 at the root of a seal lip 22, the mechanical loss caused by the seal lip is reduced while restraining the turn-over of the seal lip 22, while maintaining a stable sealing performance by letting the first side surface 24a or the second side surface 24b of this projection 24 exhibit a suction function of returning the fluid that has leaked from the lip tip end of the seal lip 22 to the sealing fluid side O when the shaft and the seal lip 22 are relatively rotated.

Abstract: A seal system for a reciprocating cylinder includes a buffer seal, a rod seal, and a wiper seal. The buffer seal includes a dynamic seal lip and a static lip extending from a hinge portion. The hinge portion of the static lip allows fluid to escape past the outer diameter of the seal when the rod is retracted thereby releasing any pressure build-up between the rod seal and buffer seal. The axial face portion of the dynamic seal lip includes axially extending notches therein. The notches prevent the buffer seal from sticking to the axial wall of the groove and provide a consistent path for the fluid to energize the annular groove between the static and dynamic lips during the extension phase which is necessary for the function of the seal. The back-up ring is an integrated part of the buffer seal, used to provide superior extrusion resistance.

Abstract: To provide a wheel support bearing assembly in which the frictional resistance can be effectively reduced while effects of minimizing leakage of the filled lubricant and ingress of dust and muddy water from outside of the bearing assembly are secured, the wheel support bearing assembly includes an outer member 1, an inner member 2 positioned inside the outer member 1 with an annular working space defined between it and the outer member 1, and rows of rolling elements 3 accommodated within the annular working space and rollingly received in part within outer raceways 4 in the outer member 1 and in part within inner raceways 5 in the inner member 2. Opposite open ends of the annular working space are sealed by respective sealing members 7 and 8 which are secured to one of the outer and inner members 1 and 2.

Abstract: In a seal-type rolling bearing, between an inner ring and an outer ring, contact-type seal plates are respectively interposed on the counter-water-drenchable side and on the water-drenchable side. On the counter-water-drenchable side, a seal plate including, in the lip leading end portion thereof, an air hole for controlling the internal and external pressures of the bearing is disposed. On the water-drenchable side, a seal plate without air hole is disposed.

Abstract: A sealing device comprises a sealing member brought into contact with a contact surface so as to be slidable in a predetermined sliding direction. The sealing member comprises a sliding contact portion containing a high polymer material to be brought into sliding contact with the contact surface. A plurality of recessed or protruding streaks, which are independent of one another, are provided side by side so as to constitute a column on a surface of the sliding contact portion.

Abstract: A rotary fluid pressure device (11) having a housing (13,31), inlet and outlet ports (21,23), a gerotor gear set (15), a valve member (51) and an input-output shaft (49). A seal assembly (73) is disposed radially between the shaft (49) and the housing (31). The seal assembly comprises, in the order of leakage flow from a case drain region (63), a high pressure shaft seal (77), an annular chamber (71) in which is disposed a rigid back-up member (79;91) for the seal (77), a drain passage (81) communicating from the annular chamber (71) to a case drain port (47), and a low pressure shaft seal (83). The back-up member (79;91) may cooperate with either the housing (31) or the seal (77) or the input-output shaft (49) to define a fluid passage (87,89;93,95), so that any leakage flow past the high pressure shaft seal (77) flows through the drain.

Abstract: A boot-type seal having a seal and a valve. The seal has a first seal member, which is configured to sealingly engage a first surface, and a second seal member, which is configured to sealingly engage a second surface. The valve is coupled to the seal and is operable in a first condition, which inhibits fluid communication therethrough, and a second condition, which permits fluid communication therethrough. The condition of the valve changes from the first condition to the second condition in response to a fluid pressure exerted on a side of the seal that exceeds a predetermined threshold pressure. A brake assembly that incorporates the boot-type seal is also provided.