Abstract: According to one embodiment, a disk device includes a first actuator assembly and a second actuator assembly which are respectively supported by a first bearing unit and a second bearing unit to be rotatable about a support shaft. The first bearing unit includes a first sleeve and a ball bearing. The second bearing unit includes a second sleeve and a ball bearing. The first sleeve includes a first end surface opposed to the second sleeve and an annular first step projecting from the first end surface, and the second sleeve includes a second end surface opposed to the first step with a gap and an annular second step projecting from the second end surface. The second step is opposed to the first step and the first end surface with a gap.

Abstract: The present invention relates to a rolling bearing comprising a first and a second bearing body which are arranged to be rotatable relative to one another about an axis, wherein the bearing bodies comprise first and second bearing rings having running surfaces which face one another and are designed and adapted to receive a plurality of rolling bodies, wherein the rolling bodies are arranged between the running surfaces of the bearing rings, which rolling bearing is characterized in that the bearing rings are designed in multipart form by means of bearing ring segments which are detachable from one another. The invention relates further to a rotary device comprising a fixed axis and a carousel which is arranged to be rotatable about the fixed axis and is to receive items for processing in the fish and meat processing industry, which rotary device is characterized in that the carousel is rotatably arranged on the fixed axis by means of at least one rolling bearing according to any one of claims 1 to 13.

Abstract: A universal interconnection system includes a bushing assembly having one or more bushing member disposed in an operative engagement between the components, wherein each bushing member is individually interconnected between the oppositely disposed components via corresponding bushing fasteners. Each of the oppositely disposed components comprises at least one interconnection aperture through which a portion of a bushing member is disposed prior to being secured therein by a corresponding bushing fastener. Each bushing fastener is removable from the bushing member thereby providing secure yet releasable interconnection of the oppositely disposed components.

Abstract: A rolling bearing is provided that includes an outer ring having a first portion which includes a first raceway and a second portion that includes a second raceway that has a larger diameter than the first raceway. An outer diameter of the first portion of the outer ring is less than an outer diameter of the second portion of the outer ring. The rolling bearing includes an inner ring having a first portion that includes a first raceway and a second portion that includes a second raceway that has a larger diameter than the first raceway. An inner diameter of the first portion of the inner ring is less than an inner diameter of the second portion of the inner ring.

Abstract: In certain embodiments, a method for manufacturing an integral duplex bearing having an outer ring, a first inner ring, and a second inner ring includes forming a first outer raceway and a second outer raceway in an inner surface of the outer ring. The method further includes forming a first inner raceway in an outer surface of the first inner ring and a second inner raceway in an outer surface of the second inner ring while the first inner ring and the second inner ring are joined together. The first and second inner rings each have an outer surface diameter less than an inner surface diameter of the outer ring such that the first and second inner rings may be positioned inside the outer ring with the first inner raceway located adjacent to the first outer raceway and the second inner raceway located adjacent to the second outer raceway. The method further includes separating the first inner ring from the second inner ring.

Abstract: In one aspect, a pitch bearing for coupling a rotor blade to a hub of a wind turbine may include an outer race defining a first outer raceway wall. The first outer raceway wall may define a center of curvature. The pitch bearing may also include an inner race defining a first inner raceway wall. The first inner raceway wall may define a center of curvature. In addition, the pitch bearing may include a plurality of roller elements disposed between the first inner and outer raceway walls. Each roller element may define a geometric center. Moreover, the center of curvature for each of the raceway walls may be offset from the geometric center of each roller element.

Abstract: A pitch bearing assembly for a wind turbine including a stiffener is disclosed. The pitch bearing assembly includes an outer race and an inner race rotatable relative to the outer race. The inner race may define an inner circumference and may include a plurality of gear teeth around the inner circumference. Further, the pitch bearing assembly includes a stiffener having a body and at least one gear pinion configured with the body. The body extends at least partially around the inner circumference of the inner race and the at least one gear pinion engages a portion of the plurality of gear teeth. Further, the body remains fixed relative to the inner race while the gear pinions may freely rotate along with the inner race.

Abstract: A method for manufacturing a steel component having a flash butt weld joint, which comprises the step of flash butt welding the joint. The method comprises the step of heating at least part of the component to a temperature above the martensite start temperature before and/or during said flash butt welding step.

Abstract: A rolling bearing comprising an inner ring, an outer ring, at least one row of rolling elements between a pair of raceways, each raceway provided on the respective inner ring and outer ring, and an annular housing comprising at least one part surrounding at least one of the rings. The outer ring comprises two separate parts. Each of the two parts of the outer ring defines one closed space with the housing. The ratio between the radius of one raceway and the diameter of the rolling elements is higher than 0:55.

Abstract: A rolling-element bearing assembly includes an inner ring, an outer ring and a plurality of rolling elements disposed between the inner ring and the outer ring on a common pitch circle diameter. A retaining device is attached to one of the inner ring and the outer ring and holds the rolling-element bearing assembly together without falling apart. The rolling elements include balls and rollers disposed on the common pitch circle diameter in an alternating manner. Further, at least one of the inner ring and the outer ring includes a raceway groove that axially supports the roller bearing balls.

Abstract: A pitch bearing assembly for a wind turbine may include an outer race and an inner race rotatable relative to the outer race. The inner race may define an inner circumference and may include a plurality of gear teeth around the inner circumference. The inner race may also include a circumferential flange extending at least partially around the inner circumference. In addition, the pitch bearing assembly may include a stiffener coupled to the circumferential flange.

Abstract: A pitch bearing assembly for a wind turbine having a stiffener is disclosed. The pitch bearing assembly may include an outer race and an inner race rotatable relative to the outer race. The inner race may define a mounting surface and an inner circumference. The mounting surface may extend generally perpendicular to the inner circumference. In addition, the stiffener may include a body and a mounting flange. The body may extend axially within a volume defined by the inner circumference of the inner race. Further, the mounting flange of the stiffener may be coupled to the mounting surface of the inner race.

Abstract: A bearing for rotatably mounting a rotational part, for example a turbine rotor of a dental handpiece, has a plurality of roll bodies, in particular balls, arranged between an inner bearing ring and an outer bearing ring, a cage surrounding the roll bodies in an axial direction, and a locking element for axially locking the bearing rings with respect to each other, wherein the locking element has a ring-like or ring-segment-like securing element fitted on an inner circumference of the outer bearing ring or on an outer circumference of the inner bearing ring in a region of the cage such that the locking element blocks the roll bodies in the axial direction.

Abstract: A bearing sleeve assembly for a shaft system, having a bearing assembled between an inner and outer sleeve, the assembly mountable as a unitary sub-assembly or as separate components.

Abstract: A rolling bearing comprising an inner ring, an outer ring, at least one row of rolling elements between the inner and outer rings, and an annular housing surrounding at least one of the rings, said outer ring comprising two separate parts, the housing comprising two distinct parts for retaining the parts of said outer ring and fixing means for fixing the distinct parts together. The first part of the housing comprises an inner axial cylindrical portion for retaining radially said outer ring and the second part of the housing comprises an outer axial cylindrical portion surrounding said inner axial cylindrical portion.

Abstract: The invention relates to a bearing device which comprises an internal ring and an external ring, which are each provided with a bearing path for rolling elements which are arranged between the rings in contact with the bearing paths. At least one of the two rings comprises a casing which is provided with an axial portion, two radial portions at the ends thereof. This device also comprises two bearing elements which are mounted in the casing and which each form a bearing path, and at least one pretensioning element which is produced from resilient material and which is arranged between one of the radial portions of the casing and one of the bearing elements. A pretensioning element is mounted in the casing of a first ring in frictional contact with the second ring in order to apply a resistant torque during the rotation of one ring relative to the other.

Abstract: A drive shaft damper assembly installed onto a drive shaft bearing secured to a drive shaft mounted to a vehicle. The drive shaft bearing assembly includes a bearing collar assembly securely attached to the drive shaft bearing. The drive shaft damper assembly also includes an inner damper assembly, interconnected to the bearing collar assembly, which defines an inner bushing interface, and an outer damper assembly defining an outer bushing interface. A bushing assembly is disposed in an operative engagement between the inner and outer damper assemblies, wherein each of a plurality of bushing members are individually interconnected between the inner bushing interface and the outer bushing interface via corresponding bushing fasteners, the bushing members being removable and replaceable to permit tuning of the operation of the drive shaft. A mounting mechanism is structured to securely attach the outer damper assembly to a portion of the vehicle.

Abstract: A drive shaft damper assembly is structured to be installed onto a drive shaft bearing while it remains secured to a drive shaft mounted to a vehicle. The drive shaft bearing assembly includes a bearing collar assembly having a collar and a securing mechanism structured to securely attach the collar to the drive shaft bearing. The drive shaft damper assembly also includes an inner damper assembly, interconnected to the bearing collar assembly, which defines an inner bushing interface, and an outer damper assembly defining an outer bushing interface. A bushing assembly is disposed in an operative engagement between the inner and outer damper assemblies, wherein each of a plurality of bushing members are individually interconnected between the inner bushing interface and the outer bushing interface. A mounting mechanism is structured to securely attach the outer damper assembly to a portion of the vehicle.

Abstract: A bearing includes a first inner race half and a second inner race half, and a first outer race half and a second outer race half. A cage defining a plurality of openings supports a plurality of rollers. The bearing is assembled by positioning the first inner race half on a mandrel and the first outer race half on a work support, positioning the cage with the rollers supported in the openings adjacent to and concentric with the first inner race half and the first outer race half. The second inner race half and the second outer race half are positioned adjacent the first inner race half and the first outer race half respectively. The first inner race half and the second inner race half, and the first outer race half and the second outer race half are then bonded together to form the bearing assembly.

Abstract: A bearing includes a first inner race half and a second inner race half, and a first outer race half and a second outer race half. A cage defining a plurality of openings supports a plurality of rollers. The bearing is assembled by positioning the first inner race half on a mandrel and the first outer race half on a work support, positioning the cage with the rollers supported in the openings adjacent to and concentric with the first inner race half and the first outer race half. The second inner race half and the second outer race half are positioned adjacent the first inner race half and the first outer race half respectively. The first inner race half and the second inner race half, and the first outer race half and the second outer race half are then bonded together to form the bearing assembly.

Abstract: A thermally stable tribological coating is applied to the outer surface of a moveable bearing outer ring in a bearing assembly for an x-ray tube rotating anode and/or the surface of a housing bore of the X-ray tube rotating anode which receives the bearing assembly. If the tribological coating is applied to the outer surface of the bearing outer ring, it is made of a material that is metallurgically incompatible with the material from which the housing containing the bearing is made. The coating includes one or more of the following: Cr, W, Mo, or Nb, or nitrides, carbides, oxides, or sulfides of Cr, W, Mo, or Nb.

Abstract: A bearing is provided that includes a first ring having at least one first raceway defined by a radially inward facing surface of the first ring; and a second ring concentric with the first ring and having at least one second raceway defined by a radially outward facing surface of the second ring. The bearing includes a plurality of rolling elements disposed between the first and second rings. The rolling elements rollingly engage the first and second raceways. The first ring has a first gap therein and the second ring has a second gap therein. One or more race reliefs extend into the first raceway and/or the second raceway.

Abstract: A bearing assembly includes an outer race and an inner race with a ball bearing element located between the inner and the outer races. The inner race has a first portion and a second portion separated from the first portion by a split. The first portion includes a first curved inner race support surface defined by a first center point and the second portion includes a second curved inner race support surface defined by a second center point that is non-coincident with the first center point.

Abstract: A rotational bearing has an outer surface and an outer layer attached to the outer surface of the bearing by overmolding, bonding or mechanical fasteners. The outer layer has an outer surface which rotatably engages a bearing surface of a track along which the bearing device is adapted to travel, and is of a material softer than the material of the track bearing surface, such as a polymer or a relatively soft metal. In one example, the bearing is rotatably attached to a foot link carrying a foot engaging platform of a human powered conveyance or exercise system.

Abstract: The invention relates to a double-row angular contact anti-friction bearing having a split outer bearing ring, a one-piece inner bearing ring, and anti-friction bodies located in two rows between the two rings. The outer bearing ring is split axially into two individual rings. To permit simple, reliable and secure transport of the bearing, the individual outer bearing rings are interconnected by a connecting element in a positive fit that allows play and the outer surfaces of the individual rings have at least one recess, which is spanned by the connecting element. At least the recess of an individual ring has a groove, in which a hook element on the connecting element engages in a positive fit and the individual rings can be twisted in relation to one another.

Abstract: A bearing arrangement with rolling elements is arranged between an outer bearing race and an inner bearing race. The inner bearing race includes a first half-race fastened to the rotating shaft and a second half-race. The bearing arrangement includes a maintaining unit which maintains the two half-races together. The maintaining unit is designed to break or deform when the bearing is subjected to a misalignment or a moment above a predetermined value, so as to allow an axial displacement of the second half-race with respect to the first half-race. The invention may be applied to a bearing for a rotating shaft of a turbine engine.

Abstract: A vehicle wheel bearing apparatus has an outer member and an inner member. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces of the outer and inner members, via cages. Seals are mounted between the outer and the inner members. A backup seal is fit onto the outer circumference of the outer side end of the outer member. The backup seal has a metal core that includes a cylindrical fitting portion and an upstanding portion that extends radially outward from the fitting portion. A sealing member is integrally adhered to the metal core. The sealing member has a side lip formed so that it extends radially outward from the metal core and inclines toward the inner side surface of the wheel mounting flange to slidably contact the flange, via a predetermined interference.

Abstract: The present invention is an improved swivel joint for use as part of a cable-guided fishing assembly. The swivel joint contains a bearing assembly comprising a series of ball bearings partially encased by an inner and outer race. During a cable-guided fishing operation, the inner and outer race exert a shearing, rather than compression, force on the ball bearing due to the unique configuration of the bearing assembly. This unique configuration increases the strength of the bearing assembly, and the corresponding strength of the swivel joint, without necessitating an increase in the outer diameter of the swivel joint.

Abstract: A bearing assembly includes an outer race and an inner race with a ball bearing element located between the inner and the outer races. The inner race has a first portion and a second portion separated from the first portion by a split. The first portion includes a first curved inner race support surface defined by a first center point and the second portion includes a second curved inner race support surface defined by a second center point that is non-coincident with the first center point.

Abstract: A roll-up shutter ball bearing assembly that does not rust, corrode, jam or stick is provided. The bearing assembly and method for assembly include the machining of a cylindrical metal insert with a peripherally grooved side wall for holding ball bearings that fit into a grooved outer bearing ring and are closed with a retaining washer or cap ring. The cylindrical metal insert, outer ring housing, retaining washer and ball bearings are made of rust resistant metal, such as stainless steel. The very high quality bearing assembly will not need to be replaced or serviced on a frequent basis and is an intended for use in roll-up storm and hurricane shutters currently on the market.

Abstract: A method of manufacturing or forming a split bearing race for an angular contact roller bearing is provided. The method includes the steps of: A) forming a generally annular blank having a first annular portion, a second annular portion, and a third annular portion disposed between the first and second annular portions, the third annular portion having a thickness greater than the thickness of the first and second annular portions; B) machining at least one of the first, second, and third annular portions; and C) forming a first and second race member of the split bearing race by bifurcating the generally annular blank along the third annular portion. The method may also include the steps of: D) heat treating the generally annular blank after machining at least one of the first, second, and third annular portions; and E) finish machining the generally annular blank subsequent to the heat treating.

Abstract: A vehicle wheel bearing apparatus has an outer member formed on its outer circumference with a body mounting flange to be mounted on a suspension of a vehicle. Its inner circumference includes double row outer raceway surfaces. An inner member includes a wheel hub formed on one end with a wheel mounting flange. A cylindrical portion axially extends from the flange. An inner ring or an outer joint member of a constant velocity universal joint is press-fit onto the outer circumference of the wheel hub. The inner ring is formed on its outer circumference with inner raceway surfaces arranged opposite to the double row outer raceway surfaces. Double row rolling elements are freely rollably contained between the outer and inner raceway surfaces of the outer and inner members, via cages. Seals are mounted within annular openings formed between the outer and the inner members. A backup seal is fit onto the outer circumference of the outer side end of the outer member.

Abstract: An inner ring 3 is fit to a stepped part 8 formed on the inner end of a hub 2b. A desired pre-load is applied to rolling elements 5 in a state that an outer end face 28 of the inner ring 3 is butted against a step surface 12 formed on the hub 2b. The inner ring 3 is fit to the hub 2b by interference fitting causing a static friction force, which is larger than a thrust load acting on the inner ring 3 based on the pre-loading. Therefore, the inner end face of the inner ring 3 is clamped with a caulking portion, which is formed by expanding outward in the diameter directions a cylindrical portion 18 formed in the inner end of the hub 2b.

Abstract: A strip of metal is wrapped into a ring configuration such that ends of the strip are positioned in a predetermined relationship to each other. The ends of the strip are attached together by a temporary weld joining the two ends of the strip, thereby forming a temporary continuous ring. After heat treating the temporary continuous ring, the ring is separated at the temporary weld to provide a heat treated split bearing ring with a controlled clearance at the split.

Abstract: A pivot bearing cartridge for an actuator in a disc storage system includes a shaft, a first outer sleeve and a second outer sleeve. The first and second outer sleeves are coupled together. Raceways are formed in the sleeves and the shaft. The raceways carry balls to form ball bearings allowing movement of the sleeves relative to the shaft.

Abstract: A bearing assembly with at least one row of balls is disclosed. The bearing assembly has a shaft tube, at least one pair of bearing covers pressed onto the shaft tube, a concave surface formed in facing sides of each of the bearing covers, a row of balls received in the corresponding concave surfaces of the pair of bearing covers and a race arranged on the outer periphery of the row of balls to receive them. The bearing assembly can be arranged with multiple rows of balls to improve the ability to bear a large load between the rotating and stationary members.

Abstract: An improved pivot mechanism for an actuator assembly of a disc drive having an E-block that supports plurality of read/write heads in data reading and writing relationship to an array of spinning data discs. The pivot mechanism has a bearing cartridge that supports the E-block and which pivots about a pivot shaft which supports a pair of ball bearings of the bearing cartridge. Each of the ball bearings contains only three balls that are evenly distributed circumferentially about the pivot shaft. Contact surfaces of the bearing outer race and inner race provide single-point contact between the races and the balls.

Abstract: A bearing detection system for an electrical generator (10) includes auxiliary bearings (29) for supporting a rotating shaft (39) upon failure of main bearings (62). The auxiliary bearings (29) are mounted on the shaft and have a slight gap (64) between their outside diameters and bearing liners 33. The gap corresponds to the main bearing permissible wear. During normal functioning of the main bearing, the auxiliary bearing frame (34) rotates with the shaft and a magnet (35) with a small clearance between its face and auxiliary bearing outer ring (32) forces the synchronized rotation of inner (37) and outer (32) races. The auxiliary bearing outer ring or race (32) has a coaxial groove (31) on its outer diameter and a detection sensor (30), mounted on the bearing liner, gives a signal per rotation of the shaft to a control circuit (40).

Abstract: A bearing assembly supports a shaft. The bearing assembly comprises an outer bearing race and an inner bearing race. Each bearing race has a race track in which a plurality of rolling elements are located. The inner bearing race is split into two halves. The two halves of the split bearing race are interconnected by curvic teeth. The curvic teeth constrain relative movement between the two halves of the split bearing race and maintain concentricity of the bearing race.

Abstract: A roller bearing assembly is disclosed which has a single-piece outer race ring having a central, circumferential depression and a pair of raceway surfaces on opposite sides thereof. An inner race ring, sized and shaped to fit within the outer race ring, comprises a pair of inner race members. Each of the inner race members has two ends and a raceway surface formed at least in part by a shoulder. The inner race members are positioned so as to abut each other at their respective abutting ends and are axially aligned such that the raceway surfaces of the inner race members are aligned with one of the raceway surfaces of the outer race ring to form two raceways. A substantially tubularly-shaped inner sleeve having two ends is disposed in the internal bore of the inner race ring for maintaining the axial alignment of the inner race members.

Abstract: The device for connecting bearing rings with ring-shaped grooves is machined into the peripheral surfaces. An essentially sleeve-shaped connecting element engages in these grooves, where flange-shaped retaining projections on the connecting element cooperate with conical clamping surfaces of the ring-shaped grooves, which are characterized by ring-shaped grooves formed in the ring-shaped undercut. These grooves have positive-locking surfaces oriented toward its interior and snap-lock elements are arranged in a ring on the retaining projections to grip behind the positive-locking surfaces.

Abstract: It is an object of the invention to provide a method of manufacturing an inner ring for a rolling bearing in which the directions of the metal flows of the inner ring can be made substantially parallel to the shape of the race surface of the inner ring to thereby manufacture a rolling bearing inner ring having an enhanced durability. In the manufacturing method, a cylindrical steel billet 1 (shown in FIG. 1 (a) including a large number of metal flows 2 formed in the axial direction of the section thereof is held and upset by and between first upper and lower metallic molds 4a and 4b each having a transfer surface 3 for the race surface of the inner ring and, at the same time, recesses 6 are formed in the upper and lower plane portions of the cylindrical steel billet 1 respectively (shown in FIG. 1(c), next after the upper and lower shoulder portions of the recesses are respectively held by and between second upper and lower metallic molds 9a and 9b (shown in FIG.

Abstract: Retaining bushing for securing bearing rings comprising a strip of sheet metal bent to form a cylinder having radially projecting retaining projections engaging in a positively locking fashion in grooves in the bearing rings, the retaining projections being distributed around the periphery and being raised up from the sheet material in the radial direction by deep-drawing and stamped out to the required width along a circumferential line around the retaining bushing.

Abstract: A combined steering knuckle and wheel ball bearing assembly has a double row, externally convergent design with a pair of separate, outer bearing races and inner pathways integrally ground into a rotating spindle. The outer races are assembled to the steering knuckle in such a way as to create a hub that is effectively integrated to the knuckle, but without requiring a complexly shaped knuckle. The knuckle has a central opening defined by a simple cylindrical edge and two bordering annular faces, all of which have clear access to be accurately machined. With the spindle, one ball row and one outer race in place, the other outer race can slide into the knuckle far enough to create a large enough radial clearance to load in the other ball row. Then, the remaining outer race is pulled back and locked in place by C shaped rings pressed between it and one face of the knuckle.

Abstract: A bearing (1) for the wheel suspension strut of a motor vehicle has an inner and an outer bearing ring (2, 3). The inner bearing ring (2) radially encloses a clearance ring (5) concentrically arranged in its bore (4). A bearing housing (8) made of deep-drawn sheet metal encloses the outer bearing ring (3). In order to reduce the total mass of the bearing and to allow it to be easily linked to a neighboring part of the car body, the bearing housing (8) forms a single piece with a flange (9) that extends essentially transversely to the bearing axis (10). The flange has at least one bore and screw (12, 13) for securing the suspension strut bearing (1) to a neighboring part of the car body.

Abstract: A mount according to this invention includes a base and a rotor rotatably mounted to the base. The mount has a central axis. The rotor has an axis of rotation which is coincident with the central axis. A base race is fixed to the base, and a rotor race is fixed to the rotor. A base track face is formed on the base race, and a rotor track face is formed on the rotor race, antipodally spaced from one another. A plurality of bearing balls are held between these track faces. The track faces are frustums of cones so as to make a point contact with the balls.

Abstract: Ball race slewing gear, for example, for open-cast mining equipment, are oil-lubricated ball race lower parts made up of segments and receiving the supporting balls supporting the superstructure, which can be rotated in relation to the lower frame. To inprove the sealing of the segments (1) against oil leaking out of the separating lines and to make it superfluous to disassemble the ball race slewing gear for each renewal of the seal, the end faces of the segments (1) are formed with recesses (2) which enclose the ball race (3) in U-shape and whose arms (5) are open in the direction of the inside and outside of the ball race lower part and which receive strand-shaped rubber or plastics sealing sections (6). The sealing sections (6) have segment side sealing lips (9) and a continuous cavity (10) and are each disposed completely in one of the two abutting segments.

Abstract: A bearing ring manufactured by the method includes the steps of forming recesses in both ends of an outer peripheral surface of a material ring having fiber flows extending substantially parallel to the outer peripheral surface and cutting into two ring halves the material ring at its center with respect to the direction of width. The ring halves are then brought together with their ends having the recesses facing to each other to form a bearing ring.

Abstract: A method of manufacturing a bearing ring of a bearing. This method includes the steps of forming recesses in both ends of an outer peripheral surface of a material ring having fiber flows extending substantially parallel to the outer peripheral surface and cutting into two ring halves the material ring at its center with respect to the direction of width. The ring halves are then brought together with their ends having the recesses facing to each other to form a bearing ring.

Abstract: A radial ball bearing comprising two race rings bent round from sheet strip, in which rings, ball raceways are formed and balls preferably arranged spaced apart in a cage roll, characterized in that in continuation of the ball raceways in both axial directions, the race rings are provided with integrally formed cylindrical prolongations, stiffening rims are formed at least on the outer race ring and the outer race ring has a smaller outer diameter in the region of the ball raceway than in the region of the stiffening rims.