Abstract: A scupper suitable for a bearing compartment of a gas turbine engine includes a windage blocker in a gutter section upstream of a drain hole, the windage blocker extends from a wall of the gutter section. A method for capturing wept oil in a bearing compartment of a gas turbine engine includes positioning a windage blocker adjacent to a drain hole forming a passage space and increasing a pressure upstream of the windage blocker to generate a vortex downstream of the windage blocker creating an oil re-circulation zone promoting oil drainage into the drain hole.

Abstract: A bearing compartment of a gas turbine engine includes a rotationally fixed structure defined about an engine longitudinal axis; a gutter section formed in the front support; an oil drainback assembly mountable to the gutter section to direct oil into a drain passage to communicate oil from the gutter.

Abstract: A system includes a bearing, a lubricant line, a vessel and a sensor. The lubricant line is designed to introduce lubricant from a bearing gap of the bearing into the vessel. The sensor is designed to measure at least one physical variable of lubricant that is situated in the vessel. The vessel includes an outlet or overflow. The system includes a lubricant sump and a device for introducing lubricant from the sump into the bearing gap of the bearing.

Abstract: A bearing system includes bearing unit and a side-jet injector. The bearing unit includes an outer race, a plurality of internal rotating components, and an inner race. The side-jet injector includes an injector for delivering a lubrication source to the plurality of rotating components to withdraw heat generated and lubricate the bearing unit during operation of the bearing system.

Abstract: This invention provides an idler for use in conveyor systems and associated shaft and support structure that reduces the potential for infiltration of contaminants into the bearing assemblies at the opposing ends of the shaft. By use of stampings, co-molded polymer with sealed metal end caps, press-fit end shafts and stamped-metal support structures a more contamination-resistant and efficiently constructed idler assembly is provided. A hollow shaft center section can be used. The polymer defines at least three sealing structures. The shaft defines a multi-piece unit, with the end shafts press-fit onto the center shaft section and held in place by the bearing subassemblies—affixed to the idler sleeve. The support framework includes three stamped and/or cut, and folded sheet metal pieces—a center section with a pair of opposing central risers that engage end shafts, and two opposing, separately attached, end risers, that engage outermost idler end shafts.

Abstract: A greasable bearing assembly may include an outer ring, an inner ring disposed within, and concentric with, the outer ring, and a plurality of balls disposed between the outer ring and the inner ring. A greasable seal may be disposed adjacent the outer ring and the inner ring, the greasable seal further comprising a toroidal shape comprising an outer face and an inner face. An outer ring-shaped surface may extend from the outer face to the inner face. An inner ring-shaped surface may extends from the outer face to the inner face. An intake opening may be disposed through the greasable seal and extend from the outer ring-shaped surface to the inner face. A securing member may be formed as a lip at the inner face to mateably couple between the inner ring and the outer ring.

Abstract: A bearing chamber configuration that favorably directs the flow of oil/air mixture inside the bearing chamber of a gas turbine engine is disclosed. The bearing chamber includes an annular baffle surrounding a rotatable shaft. The baffle comprises an annular groove facing radially inwardly and a first radially-inner annular surface extending axially from a first side of the annular groove. The first radially-inner annular surface of the baffle cooperating with the shaft to define a first space inside the bearing chamber and adjacent the seal. The first space is circumferentially uniform.

Abstract: A bearing cage for a roller bearing assembly. The roller bearing assembly includes an inner ring, an outer ring, and a plurality of roller elements. The bearing cage includes an annular body extending along an axial direction. The annular body is configured to be positioned between the inner annular ring and the outer annular ring and configured to receive a plurality of roller elements. The annular body includes a first end including a first inner radial surface opposite the inner annular ring. The annular body further includes a second end opposite the first end. The second end includes a second inner radial surface opposite the inner annular ring. The first end extends axially beyond the inner annular ring and the second end extends axially beyond the inner annular ring.

Abstract: A bearing unit provided with a rolling bearing having a radially outer race, two radially inner races, a ring of conical rollers arranged between the radially outer race and the two radially inner races, and a device for retaining grease and metering oil housed inside a groove of the radially outer race and having an annular wall arranged transversely with respect to the rolling bearing and acting as barrier for the flow of grease and provided with a plurality of through-openings for retaining the grease and allowing the oil to pass between the two rings of conical rollers in any operating condition, and also with a plurality of radial vanes engaged with the annular wall for retaining the grease.

Abstract: A rolling bearing includes a stationary radially outer ring, a groove, at least a rotatable radially inner ring, at least a plurality of rolling bodies, interposed between the radially outer ring and the radially inner ring and a grease dispenser device configured to be accommodated within the groove of the radially outer ring. The dispenser device is further provided with a radially outer crown on which at least a radially inner protrusion is rigidly fixed, the protrusion having a barrier function against a flow of grease.

Abstract: A rolling bearing includes an inner ring and an outer ring which are bearing rings; a plurality of rolling elements interposed in a rollable manner between raceway surfaces of the bearing rings; and a retainer configured to retain the plurality of rolling elements. Nozzles configured to inject a cooling fluid (R) toward the rolling elements are provided to a fixed-side bearing ring which is one of the inner ring and the outer ring, with an outlet side of each of the nozzles oriented forward in a revolution direction of the rolling elements.

Abstract: A bearing arrangement comprises a rolling element bearing assembly including a bearing cage. The bearing cage comprises an annular cage body having an inner surface defining a coaxial bore. The bearing cage has a plurality of circumferentially spaced pockets and each pocket houses a rotatable rolling element. A first annular skirt extends axially from a radially inner end of a first axial end of the cage body and at least one first support member extends radially and axially from the remote axial end of the first annular skirt to the radially outer end of annular cage body. The bearing cage is hollow and has a high stiffness to weight ratio. The bearing arrangement is particularly suitable for use for a planet gear of a planetary gearbox. The planetary gearbox may be for a gas turbine engine.

Abstract: The invention relates to a rolling element bearing having at least one inner bearing inner and at least one outer bearing ring. Rolling elements are arranged between the inner ring and the outer ring, and the rolling elements are guided by a cage. To improve the lubrication of the bearing the invention proposes that the cage includes at least one opening, preferably a bore. The opening penetrates the cage from a radial inner surface to a radial outer surface.

Abstract: A turbocharger includes a turbine, a compressor, and a bearing housing forming a bearing bore. A bearing arrangement is disposed between a shaft interconnecting the turbine and compressor wheels, and the bearing housing. The bearing arrangement includes an outer bearing race element that frictionally engages the bearing bore at both ends. At a first end, a bearing retainer that is connected to the bearing housing includes a cylindrical element that extends into the bearing bore and abuts and frictionally engages a first end of the outer bearing race element. The second end of the outer bearing race element abuts and frictionally engages a stop formed at an end of the bearing bore such that no pins or other structures are required for preventing rotation of the outer bearing race element in the bearing bore.

Abstract: A bearing assembly for a turbocharger includes a turbine wheel-side ball bearing at a first axial end of a tubular body, a compressor impeller-side ball bearing at a second axial end of the tubular body, and a bearing housing. The bearing housing includes a first opposed wall opposed to an axially outer side of an outer race of the turbine wheel-side ball bearing, and a second opposed wall opposed to an axially outer side of an outer race of the compressor impeller-side ball bearing. The outer race of the turbine wheel-side ball bearing and the outer race of the compressor impeller-side ball bearing have axially outer end surfaces which are axially outwardly displaced from respective axial end surfaces of the tubular body so that oil films are present between the respective outer races and the corresponding opposed walls.

Abstract: A wheel bearing arrangement for a vehicle, having rotatable and statically fixed components, and at least two rolling body bearings arranged radially between the rotatable and statically fixed components for rotatably mounting the rotatable component. The at least two rolling body bearings have in each case an inner ring, an outer ring, and a rolling body row arranged therebetween. A spacer sleeve is arranged at end sides of the respective inner rings for axially securing the two inner rings. A respective securing ring is arranged fixedly on the respective inner rings so as to rotate therewith. The securing rings each have a substantially axially configured lug with a respective radial embossment arranged in a respective groove configured on an outer circumferential face of the spacer sleeve, in order to connect the respective inner rings axially to the spacer sleeve via the respective securing rings.

Abstract: An oil deflector is provided comprising a ring-shaped body having a first face and an axial projection extending from the first face. The projection has a radially inwardly facing deflection surface. An oil deflector-bearing assembly includes a bearing, the oil deflector, and a carrier with a plurality of radial oil grooves. The second face of the oil deflector is arranged adjacent to an axial face of the bearing and the carrier is arranged adjacent to the oil deflector so that the projection is at least partially received in one of the oil grooves for deflecting an axial flow of oil.

Abstract: A system for forming a barrier between a lubrication oil region and an air region of a gas turbine engine comprising a lubrication oil return path, a centrifugal oil slinger on a rotating member fixed to a spool of the gas turbine engine, a spiral groove configured to direct lubrication oil toward an oil return path, a labyrinth seal, and a cavity configured to form a non-contacting seal with the spiral groove and the labyrinth seal.

Abstract: A bearing cage for a rolling element bearing assembly, the bearing cage including a cage body having an inner surface defining a bore coaxially aligned with the principal rotational axis of the bearing cage; a plurality of pockets, each pocket being suitable for housing a rolling element of the rolling element bearing assembly, the pockets being arranged sequentially around the cage body with respect to the principal rotational axis of the bearing cage; and a skirt projecting from the cage body in the axial direction; characterized by a flow deflector projecting from the skirt in the radial direction.

Abstract: A bearing cage for a rolling element bearing assembly includes an outer surface, an inner surface defining a bore, and a plurality of pockets. Each pocket of the plurality of pockets is configured to house a rolling element of the rolling element bearing assembly. The plurality of pockets are arranged sequentially around the bearing cage with respect to an axis of the bore. A guide portion of the inner surface is tapered in an axial direction of the bore such that dimensions of the bore increase towards a central region of the bore, and the bearing cage further includes a plurality of conduits providing fluidic communication between the inner surface of the bearing cage and the outer surface of the bearing cage.

Abstract: A bearing system includes a first bearing ring, a second bearing ring spaced radially outwards from the first bearing ring, and a bearing cage between the first bearing ring and the second bearing ring. The bearing cage includes a circumferential outer side, a circumferential inner side, and a plurality of circumferentially spaced retainer portions between an axially forward end and an axially trailing end. Roller elements are located in the plurality of retainer portions of the bearing cage. At least one fluid nozzle is axially spaced from the bearing cage for dispensing a fluid to the roller elements.

Abstract: The invention relates to a bearing arrangement with an outer ring and an inner ring that can rotate relative to one another, and rolling bodies, especially balls, which are located between the outer ring and the inner ring. The invention also relates to an infeed distributor and a suction exhaust device for incorporation in such a bearing arrangement.

Abstract: A rolling bearing device includes a rolling bearing unit having rolling elements retained by an annular retainer and intervening between raceways of inner and outer rings, and a nozzle member provided proximate to the outer ring. The nozzle member is provided with an annular collar portion inserted in a bearing space delimited between the inner ring and the outer ring and having a nozzle hole. This collar portion has an outer diametric surface in the form of a retainer guide surface, and an inner diametric surface of the retainer is guided by this retainer guide surface.

Abstract: flow control arrangement for controlling the flow of lubricant discharged from a bearing includes a flow control member locatable, in use, adjacent to the bearing. The flow control member defines a generally radially outer edge and is rotatable to direct lubricant discharged onto the flow control member radially outwardly towards the outer edge for ejection therefrom.

Abstract: A single-row deep groove ball bearing made substantially of an inner ring and an outer ring disposed coaxially thereto and balls disposed between the rings. The balls roll in deep groove tracks in an outer face of the inner ring and in an inner face of the outer ring, and the balls are held at equal distances to each other in the circumferential direction by a housing. The interior of the bearing is sealed by two circular ring-shaped seals axially opposite each other. At least one of the seals is a lip seal, which has an angular profile. A shape-stable radial seal leg of the seal is attached to the outer ring and forms a gap seal with an axial side of the inner ring, and a sealing lip, which is an overpressure valve, is disposed under the inner ring and slidingly contacts the inner face of the inner ring.

Abstract: The present invention is to provide a machine tool in which appropriate warm-up operation can be performed. Unnecessary warm-up operation before machining is not carried out and damage of bearings caused by the warm-up operation is prevented. A controlling unit stores data of a supply amount of lubricant to bearings and a rotation speed of a main spindle in a memory unit as time-series data. When rotation of the main spindle is started, the time-series data stored in the memory unit is used to calculate an amount of remaining lubricant in the bearings and determination of necessity of warm-up operation is made based upon the stored data. A rotation speed at a start-up time of the main spindle is controlled according to the determination result.

Abstract: An oil supply unit provided in a rolling bearing apparatus has a lubricating oil discharge nozzle in which an opening is faced to a cage portion of the rolling bearing. An opening direction of the nozzle is inclined to a rotating direction with respect to a direction of a center axis of rotation.

Abstract: In an outer ring, a plurality of lubrication oil flow paths which penetrates from an outer circumference surface of the outer ring to an inner circumference surface (in particular, raceway groove) are provided. Opening positions of the each lubrication oil flow paths are made different in a width direction being orthogonal to a rolling direction of a ball. At least one of the lubrication oil flow paths is used as a lubrication oil supply path, and a lubrication oil discharge path is selected from the other lubrication oil flow paths to adjust a range of lubrication oil amount, so that an amount of lubrication oil in the raceway groove is controlled.

Abstract: An oil scavenging system and method suitable for use in a gas turbine engine having a bearing housing. The bearing housing provides for arcuate slots within the housing and a plurality of peripherally arranged apertures disposed for cooperation with the arcuate slots. During rotation of the bearing and shaft, the rotational momentum induces rotation of the oil which distributes the oil to the peripheral circumference of the housing for eventual passage through the slots and apertures. The arrangement maximizes the use of the circumferential space of the bearing for efficient oil distribution.

Abstract: A pivot bearing has a radially inner bearing part; a radially outer bearing part, each of the parts defining a conduit for permiting a lubricant to pass through, the radially inner bearing part being supported in a rotary fashion on the radially outer bearing part, a transmission element that communicates the conduits of the parts to permit a lubricant to pass through; and a check valve dividing the conduits into a radially inner conduit system and a radially outer conduit system.

Abstract: A fin member is installed in an oil accumulating room. The fin member causes lubrication oil to follow rotation of the oil accumulating room so that the lubrication oil can be forcibly rotated. In this manner, a rotational speed difference between the oil accumulating room and the lubrication oil is made small, and an adequate oil supplying pressure is generated by the centrifugal force. As a result, a sufficient quantity of the lubrication oil can be supplied. Therefore, estimation of a supplying oil quantity becomes easy, and accuracy in prediction of the lubrication oil quantity actually used for the bearing lubrication can be improved.

Abstract: A rod body (30) is formed of magnetostrictive material and includes one end portion (30a) fixed, and a piston (35) is fixed to the other end portion (30b) of the rod body (30). The piston (35) is slidably disposed within a cylinder (36) in which there is formed a pump chamber (37). A suction port (39) for sucking lubricating oil into the pump chamber (37) is formed in the cylinder (36), while a suction valve (40) for preventing the lubricating oil from flowing out from the suction port (39) is disposed in the suction port (39). In the cylinder (36), there is disposed a nozzle (20) which communicates with the pump chamber (37) and has a sectional area smaller than the lubricating oil passage sectional area of the suction valve (40). There is disposed a coil (43) outside the rod body (30) and, to the coil (43), there is connected a control device (6) for controlling the supply of a current to be supplied to the coil (43).

Abstract: A grease-lubricated rolling bearing has an outer ring having an outer ring race in an inner peripheral surface thereof, an inner ring having an inner ring race on an outer peripheral surface thereof, rolling elements rollably provided between the outer ring race and the inner ring race, and a grease supply element for supplying an additional grease in the rolling bearing. The amount of the additional grease to be supplied at a time is predetermined to be from 0.1 to 4% of the volume of space in the bearing.

Abstract: The present invention relates to a spacer arrangement used in a duplex bearing system. The spacer arrangement has a lubricant chamber, a first spacer element within the lubricant chamber having a centrifugal ramp, and a second spacer element within the lubricant chamber having a baffle. The baffle divides the lubricant chamber into first and second chambers with each chamber communicating with one of the bearings in the duplex bearing system. The centrifugal ramp counteracts the effects of gravity and uses centrifugal forces to insure a supply of lubricant to one of the bearings, typically an upper bearing, in the duplex bearing system. The spacer arrangement has particular utility in a swashplate assembly used in helicopters, which swashplate assembly includes a stationary swashplate and a rotating swashplate with the duplex bearing arrangement being located between the two swashplates.

Abstract: A lubrication system for a rolling bearing comprised of, an inner ring fitted on a shaft rotating at high speed inside a housing, on the outer peripheral surface of which an inner ring raceway is formed; an outer ring fitted into the housing, on the inner peripheral surface of which an outer ring raceway is formed; an outer ring spacer fitted into and supported by the housing adjacent to the outer ring and having a lubrication oil path; and a plurality of rolling elements provided between the inner ring race ay and the outes ring raceway; wherein the lubrication oil is supplied through the lubrication oil path in the outer ring spacer into a space where a plurality of the rolling elements are provided between an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring, wherein any portion where the sloping direction and/or sloping angle suddenly changes does not exist from the smaller diameter end, to the larger diameter end adjacent to the inner ring raceway.

Abstract: A high speed antifriction bearing receives minute quantities of high performance grease or oil at selected intervals from an electrically controlled injector having a nozzle that is directed at the rolling elements of the bearing. By minimizing the lubricant in the bearing, the lubricant does not accumulate in quantities that render it susceptible to working. The high performance lubricant produces a boundary layer film between contacting critical surfaces within the bearing. That film is so thin that it has little capacity to churn or work and produce heat. The injector may be the type used for electronic injection of diesel fuel into the cylinders of diesel engines.

Abstract: A lubrication system for a rolling bearing comprised of, an inner ring fitted on a shaft rotating at high speed inside a housing, on the outer peripheral surface of which an inner ring raceway is formed; an outer ring fitted into the housing, on the inner peripheral surface of which an outer ring raceway is formed; an outer ring spacer fitted into and supported by the housing adjacent to the outer ring and having a lubrication oil path; and a plurality of rolling elements provided between the inner ring race ay and the outes ring raceway; wherein the lubrication oil is supplied through the lubrication oil path in the outer ring spacer into a space where a plurality of the rolling elements are provided between an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring, wherein any portion where the sloping direction and/or sloping angle suddenly changes does not exist from the smaller diameter end, to the larger diameter end adjacent to te inner ring raceway.

Abstract: A rotating shaft assembly includes a housing that defines a bore that extends from an area exterior to the housing to an area interior to the housing. A shaft is rotatably disposed in the housing about an axis of the bore. The shaft extends through the bore between the interior and exterior areas. A lubricant retention area is axially outward of, and sealed from, the interior area. The retention is configured to collect lubricant from the interior area. A sump is in fluid communication with the interior area. A drain extends between the retention area and the sump. A check valve is disposed in the drain. The check valve is oriented to permit lubricant flow from the retention area to the sump and to prevent lubricant flow from the sump to the retention area.

Abstract: A wheel hub and bearing assembly for mounting on a vehicle axle. The assembly includes a wheel hub having a longitudinal axis, a pair of bearings within the wheel hub, the bearings in spaced axial relation along the longitudinal axis of the wheel hub, a lubricant cavity within the wheel hub between the axially spaced bearings adapted to be filled with a lubricant prior to the wheel hub being mounted on an axle, and a vane disposed within the lubricant cavity and extending radially outwardly with respect to the longitudinal axis of the wheel hub. The vane includes first and second passages.

Abstract: A bearing lubricating device includes: an oiling mechanism for supplying a predetermined amount of lubricating oil to a shoulder peripheral surface of a race ring of a rolling bearing located on a side of a raceway surface of the race ring of the rolling bearing; and air jetting mechanism for jetting air so as to transfer the lubricating oil on the shoulder peripheral surface toward an interior of the bearing, wherein the air jetting mechanism has a receiving space formed in a side member disposed on a side of and adjacent to a nonrotating race ring of the bearing so as to receive air from an outside as well as an air jetting slit communicating with the receiving space, the air jetting slit having an annular shape concentric with the race ring and substantially continuous in a circumferential direction and being formed to be open in such a manner as to be oriented toward the interior of the bearing.

Abstract: The track roller bearing with stud according to the present invention is to provide a track roller bearing with stud that has a low production cost and offers easy handling in which lubrication work can be performed from either end surface of the stud and can be easily attached and removed from a machine tool and so forth. Lubricant supply port 21m continuing from the above hexagonal hole 21j is formed in addition to lubricant supply port 21n on the side of threaded portion 21e of stud 21 for the lubricant supply ports connected to lubricating paths 21g and 21h for supplying lubricant to rolling elements 24 and so forth, and lubricant supply plugs 31 are disposed in these lubricant supply ports.

Abstract: An object is to provide a small-sized track roller bearing with stud in which the lubrication feed can be performed after the bearing has been incorporated in a device or the like. In the end surface of a stud 1, a hexagon socket 1r to which a fastening tool can be engaged, is formed, and the hexagon socket 1r and a supply hole 1g of a lubricating passage are connected to each other, and in the hexagon socket 1r, an lubrication plug with an empty hole portion into which a pointed tip of a lubricating device such as an injector can be inserted so as to feed lubrication, is installed.

Abstract: A machine with bearing-mounted rotors includes a housing (1) and two cooperating rotors erected therein which are supported on bearings (8-9 and 11-12, 17-18 and 20-21, respectively) with shafts ends (5 and 5A, 14 and 14A, respectively) at their ends. The shaft ends (5, 14, respectively) of each of the rotors (2 and 3) rest in a pair of bearings (8-9, 17-18, respectively). The bearings (8 and 9) of the one pair are situated opposite the bearings (17 and 18) of the other pair. At least one spray element (27) is erected between the bearings (8 and 9, 17 and 18, respectively) of the pairs (8-9 and 17-18) for spraying lubricating liquid on the bearings (8-9-17-18). Between the bearings (8 and 9, 17 and 18, respectively) of each pair (8-9 and 17-18), a ridged ring (35, 35A respectively) is provided around the shaft and (5, 14, respectively). Each ridged ring (35, 35A) is provided with a protruding ridge (36, 36A, respectively) on its entire outer perimeter.

Abstract: A configuration of lubrication nozzle including a large flow path to connect external oil supply tube with semi-circle cross section annular flow path, and three jet flow conduits with L form having interval of 120.degree. between adjacent channels to link annular flow path and outlet is created for oil-air or oil-mist lubrication system for high speed rolling-element bearings.

Abstract: A taper roller bearing comprises an inner ring and an outer ring having tapered raceways, a bearing space in which tapered rollers are arranged, as well as a cage for mutually spacing the rollers. A grease retainer is connected to the outer ring. The grease retainer is situated next to the inner ring part having the smallest raceway diameter. The retainer comprises a ring-shaped channel in the inner space of which grease can be accommodated. The channel has apertures for communicating the channel inner space with the bearing space.

Abstract: To remove oil from an antifriction bearing, an annular space is defined between the outer and inner rings next to the row of bearing elements. A stationary part is at the inner ring. An oil discharge hole passes through the stationary part. An oil guide plate having an obliquely inclined baffle plate part extends partially around the rear side of the discharge hole and up into the annular space from the stationary part to guide oil into the discharge hole.

Abstract: An automatic transmission has a rotational shaft with an axial through-hole. The shaft is supported by a case through bearings at opposite ends thereof. In the hole, a cup-type plug with holes is engaged with the shaft at one end thereof. A lubricating means is disposed in the case facing the holes for distributing a lubricating hydraulic fluid to bearings disposed at each end of the shaft.

Abstract: A pulverizer roll wheel assembly comprises a bracket with an opening therein for fixing the outer end of a roller shaft. Bearings mount a roller wheel with pulverizing tire to the inner end of the shaft for rotation of the pulverizer. A lip seal assembly separates an oil space around the inner end of the shaft with an air space around the outer end of the shaft. A pop off relief valve normally positioned near the lip seal is repositioned to the outer face of the shaft for easier access. A cover extends over the relocated valve for extending the air space around the relocated valve.

Abstract: The lubrication insertions system of the present invention inserts lubricating oil into the critical areas of a bearing. The system comprises a delivery element for delivering lubricating oil to a predetermined point relative to the bearing. The bearing, which is rotating, causes the lubricating oil to be slung outward of the spin axis of the bearing. A cage element, having a lip that extends beyond the edge of the bearing, captures the lubricating oil and directs the lubricating oil into the bearing to the outer race of the bearing and to the rolling elements of the bearing, which track the oil to the inner race of the bearing.

Abstract: A ball bearing includes an inner ring having a raceway surface, an outer ring having a raceway surface, a plurality of rolling elements rollably disposed between the raceway surface of the inner ring and the raceway surfaces of the outer ring, and a resin cage configured to retain the plurality of rolling elements between the inner ring and the outer ring. The cage is a crown type cage having an annular base portion and a plurality of pockets formed in an axial end face of the annular base portion, in which the pockets retain the rolling elements. An axial distance between an axial position of a center of gravity of the cage and a curvature center of a spherical or cylindrical inner surface of each of the pockets is 0.6 or more times a radius of curvature of the inner surface. A hybrid vehicle transmission has this ball bearing.