Abstract: A lubricating oil volume adjustment system and a lubricating oil volume adjustment method are provided. The system includes a storage device and a processor and is connected to a machine including a motor through a data acquisition device acquiring current information of the motor. The storage device stores a machine learning model trained by a training data set including a plurality of pieces of the current information of the motor during operation and a plurality of temperature values measured during operation of the machine. The processor is configured to acquire the current information of present operation of the motor by using the data acquisition device, predict a temperature value of the machine when the motor operates under the current information by using the machine learning model, and calculate and adjust a lubricating oil volume suitable to be used by the machine during operation according to the predicted temperature value.

Abstract: A ball bearing has an outer circumferential surface of an inner ring subjected to a surface treatment by laser cladding in a circumferential direction, forming an annular first build-up layer with which a plurality of balls 4 is brought into contact so that the balls are rolled in the circumferential direction (first build-up layer formation step). An inner circumferential surface of an outer ring is subjected to a surface treatment by laser cladding in a circumferential direction, thereby forming an annular second build-up layer with which the plurality of balls contacts so that the balls can be rolled in the circumferential direction (second build-up layer formation step).

Abstract: A gas turbine engine includes a fan that has fan blades wherein the fan delivers airflow to a bypass duct. A gearbox is defined along an engine axis. A low spool is arranged aft of the gearbox and coupled to drive the gearbox. A front center body assembly is defined around the engine axis. A flexible support supports the gearbox relative to the front center body assembly. A bearing package is mounted to the front center body assembly and the low spool. A front wall is mounted to the front center body assembly. The front wall is removable from the front center body assembly to access at least one of the gearbox or the bearing package. The low spool includes a low pressure compressor hub that provides a spline for engaging the bearing package.

Abstract: A vehicle drive unit (11) includes a spindle (12) on which a female spline portion (12G) is formed, a wheel (15) disposed on an outer peripheral side of the spindle (12), wheel bearings 17, 18 that rotatably support the wheel (15) in relation to the spindle (12), an electric motor (21) located on an axial one side of the spindle (12), a shaft (22) connected to an output shaft (21B) of the electric motor (21), a planetary gear reduction device (25) disposed between the shaft (22) and the wheel (15), and a shaft bearing (46) that rotatably supports the shaft (22) in relation to the spindle (12). A retainer (42) retaining the shaft bearing (46) is disposed on an inner peripheral surface side of the spindle (12), and a male spline portion (42E), which is spline-coupled to a female spline portion (12G) of the spindle (12), is disposed on the retainer (42).

Abstract: A bearing assembly having a conductive medium. The bearing unit is mountable on a shaft and includes a bearing unit including a radially inner bearing ring including a radially inner race, wherein the radially inner bearing ring is rotatable with the shaft. The bearing unit further includes a radially outer bearing rings including a radially outer race, wherein the radially outer bearing ring is stationary with respect to the shaft; and a plurality of rolling elements supported to roll between the radially inner race of the radially inner bearing ring and the radially outer race of the radially outer bearing ring. An annular chamber body is disposed adjacent the bearing unit. A conductive medium is disposed within the chamber body.

Abstract: A planetary gearbox device, a gas turbine engine with a planetary gearbox device, and a method for producing a scoop pump. The planetary gearbox device includes an oil supply appliance, wherein the oil supply appliance has a ring-shaped scoop pump that is connected to the rotatable shaft of the planetary gearbox device and an oil supply fixedly arranged at the housing and by which oil is supplied to the scoop pump. The scoop pump has multiple blades that extend in a circumferentially arranged manner and extend from a radially outer area in the direction of a radially inner area. The blades delimit grooves extending in the circumferential direction in the radial direction and respectively form a groove base of the grooves. The oil is conducted from the oil supply to outlets via which oil is conducted out of the scoop pump in the radial direction outwards.

Abstract: An assembly for an epicyclic reduction gearset, including a satellite carrier, satellites, and at least one satellite bearing including a central axis linked to the satellite carrier. An inner ring mounted on the central axis, an outer ring mounted to rotate around the central axis. A lubrication circuit brings a flow of oil between the rings. The lubrication circuit includes a first portion supplied with oil with openings to the outside of the inner ring in a radially inner area of the bearing. A second portion has openings to the outside of the inner ring. An intermediate portion has at least one channeling connecting the first portion to the second portion, having at least one singular pressure reduction formed by an elbow and at least one flattening of a transverse cross-section. The central axis has a radially outer first surface. The inner ring has a radially inner second surface.

Abstract: A transfer coupling includes a static component and a rotatable component arranged concentrically, the static component including a first number of radially extending ports and the rotatable component having a second number of radially extending ports the radially extending ports arranged in a common circumferential plane wherein the ports are configured and arranged, in use, to homogenise a flow area for a fluid being transferred through the ports and thereby create a homogenous volume flow.

Abstract: A bearing includes an inner ring defining an inner raceway, an outer ring defining an outer raceway, and a plurality of rolling elements contacting the inner raceway and the outer raceway to enable relative rotation between the inner ring and the outer ring. A connecting ring is radially between and contacts the inner ring and the outer ring. A chamber is bound at least partially by the connecting ring and one of the two rings. The chamber is at least partially filled with a conductive grease or lubricant to enable electric current to travel between the outer ring and the inner ring at the connecting ring.

Abstract: A system can include a housing that includes a bore having a longitudinal axis; a cartridge disposed in the bore where the cartridge includes a recess; a bearing assembly disposed in the cartridge where the bearing assembly includes an outer race and rolling elements; and a locating plate attached to the housing where the locating plate includes an extension that is received by the recess of the cartridge.

Abstract: A rolling bearing device includes: a bearing portion that has an inner ring, an outer ring, a plurality of balls interposed between the inner ring and the outer ring, and a cage that holds the plurality of balls; and an oil supply unit provided adjacent to the bearing portion in the axial direction. The oil supply unit has a pump configured to supply lubricating oil to the bearing portion. The pump has a pump body provided with a nozzle that discharges lubricating oil and a vibration element that vibrates the pump body.

Abstract: A bearing apparatus includes a lubrication unit and a sensor to sense the temperature of the lubricant in the lubrication unit. The lubrication unit has a pump having a storage portion in which the lubricant is stored and a piezoelectric body that is deformed by an applied voltage, the pump enabling the lubricant in the storage portion to be discharged into the annular space by reducing the volume of the storage portion in conjunction with the deformation of the piezoelectric body, the pump also enabling the lubricant to be sucked into the storage portion to refill the storage portion with the lubricant by increasing the volume of the storage portion, and a control unit that performs control by outputting a control signal allowing the speed of change in the volume of the storage portion to depend on the temperature of the lubricant.

Abstract: An object is to provide a motor-incorporation-spindle ball bearing capable of allowing cooling air which enters inside the bearing of the motor-incorporation-spindle to be discharged smoothly out of the bearing without causing turbulent flow inside the bearing, does not cause a retainer easily to be vibrated, and provides a high level of silent operation. A seal plate has a length to allow air to pass through the bearing from an entrance side toward an exit side substantially straightly without resistance. Therefore, the seal plate is less likely to be exposed to unnecessary force when the air passes through the bearing; the seal plate is prevented from wobble and deformation; stable sealing is ensured; the air is discharged smoothly without causing turbulent flow inside the bearing; a retainer is not easily vibrated, and silent operation is maintained.

Abstract: A bearing device includes a bearing portion that includes an inner ring, an outer ring, a plurality of rolling elements that are interposed between the inner ring and the outer ring, and a cage that holds the plurality of rolling elements, one of the inner ring and the outer ring being a rotational ring, and another of the inner ring and the outer ring being a fixed ring; and an oil supply unit that is provided adjacent to the bearing portion in an axial direction. The cage includes a guide portion that is configured to be in sliding contact with a part of the fixed ring via lubricating oil. The oil supply unit includes a vibration sensor configured to detect a vibration of the fixed ring, and a pump configured to supply the lubricating oil to the bearing portion.

Abstract: A seal assembly having a sealing ring, including at least one dynamically stressed sealing lip (1) and a buffer seal (2), which is arranged adjacent to the sealing lip (1) at an axial distance (3) therefrom, wherein the buffer seal (2) is made of an electrically conductive material, and wherein the sealing lip (1) and the buffer seal (2) are adjacent to and in contact with a surface (5) to be sealed of a first machine element (6) to be sealed, wherein the first machine element (6) to be sealed is arranged adjacent to a second machine element (8) at a radial distance (7) therefrom, wherein the sealing ring (1) is arranged in the a gap (9) formed by the radial distance (7), wherein the first (6) and second machine elements (8) are in contact with the buffer seal (2) in an electrically conductive manner.

Abstract: A progressing cavity drilling motor positionable in a wellbore includes a tubular housing, a stator having a collection of helical lobes, and a rotor having a collection of helical lobes. The rotor orbits about the central longitudinal axis of the stator. A bearing assembly is coupled to an end of the housing and is disposed around an end of the rotor. The bearing assembly includes a bearing housing disposed concentrically in the stator housing, an outer bearing disposed concentrically in the bearing housing, and an inner bearing disposed on the first cylindrical end of the rotor. The inner bearing has a central axis aligned with the central axis of the rotor and is positioned in the outer bearing such that the inner bearing orbits around the central longitudinal axis of the stator when the rotor is rotated in the stator.

Abstract: A bearing assembly for a traction motor of a railway vehicle includes at least one rolling-element bearing having an inner ring and an outer ring. At least one row of rolling elements is disposed between the inner ring and the outer ring. A sealing assembly is disposed in at least one of the axial end portions of the rolling-element bearing. The sealing assembly includes a first sealing region disposed adjacent to the bearing rings, and a second sealing region spaced farther from the bearing rings than the first seal region. The first sealing region includes a lip seal, and the second sealing region includes a labyrinth seal. The internal volume surrounding the rolling elements located between the bearing rings is in fluid communication with the atmosphere.

Abstract: A pump device with at least one conveying device at least for a conveyance of a fluid, includes at least one drive unit for acting onto the conveying device. The conveying device includes at least one conveying space element, which at least partly delimits the conveying space and is embodied in a rigid fashion, and at least one elastically deformable conveying element, which forms the conveying space together with the conveying space element. The conveying element is embodied in a spring-elastic fashion, wherein the conveying element, following a deformation, automatically seeks to re-assume a basic shape, in particular a convexly curved basic shape of the conveying element, wherein, for a conveyance of a fluid, the conveying element is movable, starting from a convex curvature, which is oriented in a direction facing away from the conveying space element, towards the conveying space element, wherein at least the conveying space element and the conveying element together form an exchangeable unit.

Abstract: A turbine engine includes a main shaft bearing compartment seal. The seal includes at least an approximately circular seal portion and a seal carrier disposed about the approximately circular seal portion. A plurality of anti-rotation pins maintain the seal carrier in position relative to a housing and are received in an anti-rotation slot of the seal carrier.

Abstract: Vented bearing retainer and roller bearings for turbomachines, such as compressors and turbines. Axial openings in, or adjacent to, the inner circumferential surface of the bearing retainer member equalize pressure differentials on the roller bearings. Axial grooves in the inner circumferential surface can be provided. Damper members on the OD of the retainer member can minimize rigid vibration modes and accommodate thermal growth and misalignment.

Abstract: A flexible sheet-type leak sensor device according to the present invention comprises: a flexible base sheet made of a non-conductive fluorine-based synthetic resin comprising ethylene tetrafluoroethylene (ETFE); conductive lines formed on a surface of the base sheet so as to have a predetermined pattern and so as not to meet or cross each other, the conductive lines being formed by depositing on the base sheet surface a carbon black-containing, conductive fluorine-based synthetic resin comprising ethylene tetrafluoroethylene (ETFE); and a conductive material composed of pure carbon black, formed at the bottom of the conductive lines.

Abstract: A sealing device for an enclosure of a turbine engine formed by an assembly of juxtaposed rotating and/or static bodies is provided. The sealing device includes at least one brush seal having a brush body, carried by at least one first member, and bristles extending from the brush body and arranged so as to rub against at least one second member rotatable relative to the first member, so as to produce a pressure difference between the inside of said enclosure and its outer environment. The device further includes a labyrinth-type seal, the labyrinth being positioned in series with the brush seal between the inside of the enclosure and its outer environment.

Abstract: A high durability roller, a manufacturing method thereof and a power transmission device with the high durability roller are provided. The roller for a power transmission device that comprises a plurality of rollers in contact with each other directly or with lubricant between them, includes: a metal base having a Young's modulus of 220 GPa or less; and a coating that is formed on a surface of the metal base, includes hard particles and a metal component composed of at least either simple metal or alloy, and has a Young's modulus of 250 GPa or more. The power transmission device includes the roller. The method of manufacturing the roller includes: forming the coating on the surface of the metal base by thermal spraying using a thermal spray material that comprises the hard particles and the metal component composed of at least either simple metal or alloy.

Abstract: A rolling bearing apparatus includes: a bearing portion having an inner ring, an outer ring, a plurality of balls, and a cage; and a lubrication unit that is provided adjacently to an annular space formed between the inner ring and the outer ring and that has a pump that feeds a lubricant into the annular space. The pump has a main body portion having an internal space in which the lubricant is retained and being open at one end of the main body portion, a metal diaphragm fixed to a fixation portion that is a part of the main body portion so as to close the opening of the main body portion, and a piezoelectric element fixed to the diaphragm. At least the fixation portion of the main body portion is formed of metal, and the fixation portion and the diaphragm are fixed together by metal joining.

Abstract: A rolling bearing that can prevent peeling on a surface of an iron-based metal member by hydrogen brittleness even under a severe environment is provided. The rolling bearing 1 has plural bearing elements formed of an iron-based metal, and a lubricant composition 7 that lubricates metal contact surfaces of the respective bearing elements, the lubricant composition 7 is a grease containing a base oil and alkanolamine and being free of alkali metal salts and alkaline earth metal salts of inorganic acids, the base oil is at least one oil selected from alkyl diphenyl ether oils, poly-?-olefin oils and ester oils, and the alkanolamine is contained by 0.1 to 10 parts by weight with respect to 100 parts by weight of the total amount of the base oil and a thickener.

Abstract: A rolling bearing apparatus includes a bearing portion and a lubrication unit. The lubrication unit is provided adjacently to an annular space in an axial direction. The annular space is formed between an inner ring and an outer ring, and the lubrication unit has a tank storing lubricant that is supplied to the annular space. The tank has an outer wall on a radially outer side, and a space formed on a radially inner side of the outer wall is a storage portion for storing the lubricant. An oil supply hole that is used to refill the storage portion with the lubricant is provided passing through the outer wall. The oil supply hole is open to the radially outer side.

Abstract: An axle assembly that is configured with reduced weight and an internal configuration that is configured to reduce losses through, for example, higher efficiency gearing, low viscosity lubricant and reduced lubricant levels as compared with current production automotive axle assemblies that are configured with a similar overall gear ratio and capacity.

Abstract: A method for manufacturing a roller, adapted to equip a mechanical system forming a cam follower or a rocker arm. The roller is centered on a central axis and comprising: an outer cylindrical surface adapted to roll on a cam, an inner cylindrical bore adapted to receive a pin belonging to the mechanical system, and two lateral faces extending radially to the central axis. The method includes a machining step forming circular grooves that are concentric with each other on at least one of the lateral faces of the roller. The roller can be installed within a mechanical system.

Abstract: A pressure controlled chamber arrangement comprising a chamber, one or more seals arranged in use to limit fluid flow between the inside and outside of the chamber and a vent system arranged in use to remove a vent flow of fluid from the inside of the chamber. The vent system at least contributes to the formation of a pressure drop across the one or more seals from the outside to the inside of the chamber. The vent system comprises a flow controller arranged in use to control the quantity of fluid removal via the vent system in accordance with the sealing performance provided by the one or more seals, the vent system giving increased quantity of fluid removal for decreased sealing performance.

Abstract: A rolling bearing includes an outer ring, an inner ring in which a shoulder diameter at one end of the rolling bearing in an axial direction is different from a shoulder diameter at the other end of the rolling bearing in the axial direction, a cage, a plurality of rolling elements, and shielding portions. A first clearance between an outer ring inner peripheral surface facing a large end of the inner ring having the larger shoulder diameter and a cage outer peripheral surface facing the outer ring inner peripheral surface is larger than a second clearance between an outer ring inner peripheral surface facing a small end of the inner ring having the smaller shoulder diameter and a cage outer peripheral surface facing the outer ring inner peripheral surface.

Abstract: A bearing assembly comprising a rolling element bearing and an acoustic emission unit. The rolling element bearing is provided with at least a bearing seal, wherein the acoustic emission unit is arranged on the bearing seal. The assembly also provides an improved method for measuring acoustic emissions in a bearing assembly.

Abstract: The present disclosure involves an oil scoop manifold receives and directs the oil in fore and aft directions to lubricate multiple bearing assemblies.

Abstract: A rolling bearing unit includes: a rolling bearing including an inner ring, an outer ring and a plurality of rolling elements disposed between the inner ring and the outer ring; an annular outer ring spacer disposed adjacent to one axial end of the rolling bearing, the outer ring spacer having a grease reservoir in the form of a groove extending along the circumferential direction of the outer ring spacer, and an opening that provides communication between the grease reservoir and the inside of the rolling bearing; and grease retained in the grease reservoir. Channels are formed in the grease to extend from the opening along the axial direction of the outer ring spacer.

Abstract: Bearing grease includes an ether base oil and a urea thickener, and is used in an atmosphere of a fluorine compound-based refrigerant. No grease is eluted for a long period in a bearing with use of the bearing grease. Moreover, since a collection system is unnecessary unlike a lubricating oil, the surroundings of the bearing can be made compact. Accordingly, the bearing with use of the bearing grease is easily applicable to automobiles and a variety of industrial machinery as an energy collection apparatus using the Rankine cycle.

Abstract: A deflector is arranged to prevent differential oil, as lubrication oil, leaking from a gap between a rod of an axle and a shaft portion of a drive shaft and passing through a unit bearing, from attaching to an inner periphery of a brake drum. A guide groove unit is formed on an inward surface of a hub in a vehicle-width direction so as to guide the differential oil leaking into an internal space defined inside of the deflector to outside of the brake drum.

Abstract: The present application relates to an annular cover for a lubrication chamber of a rotary bearing of a turbomachine. The cover includes a wall that is generally circular and flared with an orifice that is designed to receive a transmission shaft opposite an assembly surface for the cover, and at least one duct communicating with the inside of the wall and extending along the wall as far as the assembly surface. The duct is formed in the thickness of the body of the wall which is made from the same material, and which includes a composite material with a thermoplastic matrix and carbon fibres. The present application also relates to a turbomachine including a compressor linked to a turbine via a transmission shaft, an intermediate fan casing, and a bearing joining the transmission shaft to the intermediate casing. The casing is placed in a lubrication chamber delimited by an annular chamber cover, a chamber casing carrying the bearing and the cover.

Abstract: A bottom bracket assembly for low-speed rotation is formed of a main body having an axial hole running therethrough, a spindle inserted into the axial hole, and a pivotal assembly having a self-lubricating bearing, a bushing, and a ball valve, each of which is made of a self-lubricating material. The self-lubricating bearing is sleeved onto the spindle and located at one end of the axial hole. The ball valve includes a through hole running through an axis thereof and sleeved onto one end of the spindle relative to the self-lubricating bearing. The external diameter of the bushing is smaller than the internal diameter of the axial hole. The bushing includes a spherical bushing aperture for engagement with the ball valve to make the bushing deflected on the center of the ball valve and thus the rotation of the spindle remains stable and smooth.

Abstract: An oil-lubricated anti-friction bearing is provided for a horizontal arrangement of a rotational axis with a shaft seal that separates a bearing inner chamber, which accommodates rolling bodies, from a bearing outer side, and has a clamping arrangement which acts on the shaft seal from a bearing outer side in order to fix the shaft seal axially. The clamping arrangement has an outlet for oil.

Abstract: A bearing for retro-fit or repair of an engine provides high reliability through a sleeved bearing design having externally-supplied lubrication. The bearing assembly may be supplied as a kit including a lubrication delivery tube and an oil filter adapter having a port for supplying the external lubrication to a mounting flange of the bearing. In order to install the bearing a captive sleeve is inserted in a hollow end of the shaft being supported. A cap having a threaded stud is inserted with the sleeve into the hollow end of the shaft and secured by the required snap ring. Then a nut is used to secure the cap and the sleeve to a stud affixed to the mounting flange that secures the bearing assembly to the engine.

Abstract: A bearing assembly for use in a medical, surgical, or dental handpiece that enables spindle rotation for a supported rotary tool at high speeds. The bearing assembly incorporates annular gap shields at each axial end to prevent contaminate ingress and to retain lubricating grease within the bearing assembly to avoid re-lubrication after each use or sterilization cycle.

Abstract: A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil and a thickener, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 80% by mole or more and less than 91% by mole, and a worked penetration being 300 to 330.

Abstract: There is provided a rolling bearing which inhibits spalling of a rolling element and has a long service life even under rigorous environments. The rolling bearing comprises grease for lubricating rolling contact parts and/or sliding contact parts between a first raceway surface and a rolling elements and/or between a second raceway surface and a rolling elements, wherein the grease comprises a base oil, a thickener and an extreme pressure additive, the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole, and a reaction temperature of the extreme pressure additive with iron is 260° C. or lower.

Abstract: There is provided a gel lubricant including: a base oil containing an ester synthetic oil and a synthetic hydrocarbon oil in which the mass ratio (X:Y) of the ester synthetic oil (X) to the synthetic hydrocarbon oil (Y) is in the range of 35:65 to 75:25; and a gelatinizer which contains two kinds of styrene block copolymers and is included in the gel lubricant in an amount of 1.5% by mass to 10% by mass.

Abstract: A rolling bearing assembly, comprising at least a rolling bearing outer ring (4) of a rolling bearing, an intermediate element that surrounds the rolling bearing outer ring (4), and a housing part, into which the intermediate element (9) is inserted. The outer ring (4) is rotatably arranged in the intermediate element (9) and has a circumferential oil catching strip (6) at one of the end faces thereof, which oil catching strip is designed to convey oil into a contact zone formed between the outer ring (4) and the intermediate ring (9). A damping system having a damping recess is formed between the housing and the intermediate element (9).

Abstract: A system and method is provided for a low profile rotating control device (LP-RCD) and its housing mounted on or integral with an annular blowout preventer seal, casing, or other housing. The LP-RCD and LP-RCD housing can fit within a limited space available on drilling rigs. An embodiment allows a LP-RCD to be removably disposed with a LP-RCD housing by rotating a bearing assembly rotating plate. A sealing element may be removably disposed with the LP-RCD bearing assembly by rotating a seal retainer ring. Alternatively, a sealing element may be removably disposed with the LP-RCD bearing assembly with a seal support member threadedly attached with the LP-RCD bearing assembly. The seal support member may be locked in position with a seal locking ring removably attached with threads with the LP-RCD bearing assembly over the seal support member. Spaced apart accumulators may be disposed radially outward of the bearings in the bearing assembly to provide self lubrication to the bearings.

Abstract: A roller bearing device (1) and to a method for operation thereof, including a roller bearing (2) having roller contacts (6, 7) in contact with a medium and lubricated by the liquid medium (10). In order to improve the lubrication and load capacity of such a medium-lubricated roller bearing (2) while simultaneously improving the biologically compatible behavior, a biologically neutral additive material (13) that thickens the medium is held available in a holding device (14) and metered to the roller contacts (6, 7) on demand.

Abstract: The rolling bearing comprises an inner ring, an outer ring, at least one row of rolling elements disposed between raceways provided on the rings, and an annular housing inside which at least one of the rings is arranged. The ring provides two parts and each of the two parts delimits with the housing a closed space inside which a lubricant is located. The rolling bearing further comprises passage means for the lubricant to pass from the closed spaces to the raceways. The ratio between the thickness of a guiding portion of each of the two parts delimiting the raceway and the outer diameter of the bearing is from 0.7% to 3%. In a second embodiment, the ratio between the thickness of the guiding portion and the outer diameter is and preferably from 1.1% to 1.9%.

Abstract: A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring, in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil, a thickener and an amine antioxidant, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 91 to 99% by mole, and the amount of the amine antioxidant in the grease composition being 21% by mass or more.

Abstract: Retained austenite amounts of surface layer parts of an inner ring and an outer ring are set at more than 0% by volume. A ball (rolling element) is obtained by processing a raw material including alloy steel in which an Si content is 0.3 to 2.2% by weight and an Mn content is 0.3 to 2.0% by weight and Si/Mn is 5 or less (by mass) and then performing thermal treatment including carbonitriding or nitriding. Si.Mn nitride including nitride of silicon (Si) and nitride of manganese (Mn) is present in a rolling surface of the ball in a range of 1.0 to 20.0% by area. An N content of a surface layer part of the ball is 0.2 to 2.0% by weight, and a retained austenite amount is 0 (exclusive) to 50% (inclusive) by volume and the following formula (1) is satisfied.

Abstract: A bearing assembly includes at least one outer ring and an inner ring unit including first and second inner rings, the inner ring unit having a central, axial bore extending through the first and second inner rings, and a plurality of attachment bores for attaching the bearing assembly to a bearing carrier. A first plurality of roller bodies is disposed between the at least one outer ring and the first inner ring and a second plurality of roller bodies is disposed between the at least one outer ring and the second inner ring. A pin extends through the central axial bore of the first inner ring and through the central axial bore of the second inner ring, and the pin maintains a predetermined preload on the bearing assembly by holding the first inner ring in a fixed position relative to the second inner ring.