Abstract: According to the present embodiments, provided is a rack-driven power assisted steering device in which a rolling member supporting the rotation of a ball nut is provided in a double row, a ball nut assembly is coupled to a housing through an elastic member, the flow of the ball nut is absorbed to improve noise performance, and the rolling member is directly supported by the ball nut or a support member, so that the number of parts can be reduced and easy assembly is possible.

Abstract: A rotary connection for a rotor blade of a wind turbine. The rotary connection is used, for example, for adjusting a rotor blade of a wind turbine. The rotary connection according contains an outer ring and an inner ring. The inner ring has a contact surface in the direction of the rotor blade and a screw fixing surface in the direction of the rotor hub. The contact surface and the screw fixing surface are arranged parallel to each other and provided with passage holes, which each have a central axis. Rolling elements are arranged in at least two running rows located under each other between the outer ring and the inner ring, wherein the rolling elements each have a rolling element diameter. According to the invention, at least the lower running row is arranged with its rolling element centre underneath the screw fixing surface.

Abstract: A turbocharger includes a center housing that includes a through bore and a stepped locating pin socket that includes a stop surface; a bearing disposed in the through bore where the bearing includes an opening; and a stepped locating pin where the stepped locating pin includes a pin portion received in part by the opening of the bearing and a seating portion secured via an interference fit in the stepped locating pin socket where a maximum radius of the seating portion exceeds a maximum radius of the pin portion and where the stepped locating pin includes a stop surface that contacts the stop surface of the stepped locating pin socket to axially position the stepped locating pin in the stepped locating pin socket.

Abstract: Disclosed is a bearing arrangement for a bearing wheel in a turret, the bearing arrangement being providable between the bearing wheel and a wheel shaft around which the bearing wheel is rotatably connectable. The bearing arrangement includes a slide bearing enabling the bearing wheel to slide axially on the shaft. The bearing arrangement further includes a roller bearing. A plurality of bearing arrangements may form a bearing system that is employed in a turret of a vessel. A method for mounting a bearing arrangement in a bearing system is also disclosed.

Abstract: Rolling bearings are stacked with their center lines extending in a vertical direction. Each of the rolling bearings has an inner ring, an outer ring, a plurality of balls, and an annular cage. Each of the rolling bearings has a structure that induces, upon rotation, an action that causes lubricating oil to flow upward along the outer ring in the annular space. The cage has an annular portion provided adjacently below the balls to prevent air from moving to the outer ring side from the inner ring side.

Abstract: A bearing device for a shaft has at least two axially spaced-apart, radial anti-friction bearings with rolling bodies. In each of the anti-friction bearings, an inner race is formed for the rolling bodies on an inner bearing element which is connected fixedly to the shaft. An outer race is formed for the rolling bodies on an outer bearing sleeve having at least two bearing sleeve elements which are guided coaxially with respect to one another in a guide device. Each of the anti-friction bearings is assigned a separate bearing sleeve element with in each case one anti-friction bearing running surface. The guide device converts a rotation of at least one of the bearing sleeve elements about the shaft longitudinal axis into a spacing change of the two bearing sleeve elements. The axial spacing between the bearing sleeve elements can be adjusted and/or fixed and/or prestressed with spring element.

Abstract: Reaction wheel assemblies having relatively compact and lightweight form factors (referred to as “small scale” RWAs) are disclosed. Such small scale RWAs are well-suited for deployment onboard relatively small satellites, but are not restricted to usage within any particular device or platform. In one embodiment, the small scale RWA includes a primary support platform to which a rotor is coupled for rotation about a spin axis. An axially-expanded face-to-face (DF) duplex bearing pair is disposed between the rotor shaft and the support platform. The DF duplex bearing pair includes first and second rolling element bearings positioned around an intermediate portion of the rotor shaft. The first and second rolling element bearings have first and second bearing load lines, respectively, which are spaced by a tailored bearing load line separation (SLL).

Abstract: An axle device for a motor vehicle includes an axle shaft, a wheel receiving unit fixed on an end of the axle shaft, and a support body on which the wheel receiving unit is supported from rotation fixed about an axis of rotation. A bearing unit is arranged between the support body and the wheel receiving unit. The bearing unit includes an inner bearing shell at least partially formed by a surface portion of the wheel receiving unit, an outer bearing shell at least partially formed by a sleeve body abutting the support body, and a bearing assembly arranged between the inner bearing shell and the outer bearing shell.

Abstract: A center supporting device for a propeller shaft of a vehicle may include an inner bearing device configured to axially movably support a stub shaft, the stub shaft being connected between a front shaft and a rear shaft of the propeller shaft, an outer bearing device mounted outside the inner bearing device to axially rotatably support the stub shaft, and an insulator mounted in an elastically deformable manner between the outside of the outer bearing device and a bracket fixed to a vehicle body.

Abstract: A rotary shaft device (3) includes a shaft body (20) rotatably supported by angular bearings (35, 36), and a support body (40) configured to rotatably support the shaft body (20) via the angular bearings (35, 36). A ball rolling groove (21) having a Gothic arch shape in which rolling elements (39) of the angular bearings (35, 36) roll is formed in an outer circumferential surface of the shaft body (20).

Abstract: A steel characterized in that its composition is percentages by weight: C=0.18-0.30% Co=1.5-4% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=traces-0.3% Nb=traces-0.1% B=traces-30 ppm Ni=11-16% where Ni?7+3.5 Al Si=traces-1.0% Mn=traces-2.0% Ca=traces-20 ppm Rare earths=traces-100 ppm if N?10 ppm, Ti+Zr/2=traces-100 ppm where Ti+Zr/2?10 N if 10 ppm<N?20 ppm, Ti+Zr/2=traces-150 ppm O=traces-50 ppm N=traces-20 ppm S=traces-20 ppm Cu=traces-1% P=traces-200 ppm the remainder being iron and inevitable impurities resulting from the smelting. A process for manufacturing a part from this steel, and part thus obtained.

Abstract: A wheel bearing device includes: an inner shaft; an inner ring; an outer ring; and first and second rolling element groups. The first rolling element group is disposed on the vehicle outer side. The second rolling element group is disposed on the vehicle inner side. The first and second rolling element groups have the same contact angle and the same number of balls. A relationship between a ball diameter D1 of the first rolling element group and a ball diameter D2 of the second rolling element group is set such that an inequality D1>D2 is satisfied. A relationship between a pitch circle diameter PCD1 of the first rolling element group and a pitch circle diameter PCD2 of the second rolling element group is set such that an equation PCD1=D1/D2×PCD2 is satisfied.

Abstract: A turbocharger assembly includes: a housing with a through-bore and a cross-bore that intersects the through-bore to define an upper portion of the cross-bore with a first diameter and a lower portion of the cross-bore with a second diameter where the first diameter exceeds the second diameter; a bearing disposed in the through-bore of the housing where the bearing includes a through-bore configured to support a shaft and a cross-bore that intersects the through-bore; and a locating pin with a diameter that exceeds the second diameter of the lower portion of the cross-bore of the housing, the locating pin press-fit at least partially into the lower portion of the cross-bore of the housing and disposed at least partially in the lower portion of the cross-bore of the bearing to locate the bearing in the through-bore of the housing. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

Abstract: A pulley-bearing assembly provided with a pulley and a rolling bearing confined by respective coupling surfaces co-axial to each other and defining a groove there between; the rolling bearing being provided with two rows of rolling bodies having pitch diameters (D, Di) of different size, and a metallic ring being pressed into the groove and deformed so as to join the pulley with the bearing.

Abstract: A rolling-element bearing includes an inner ring and an outer ring having at least two adjacently disposed raceways for at least two rows of rolling elements. In order to avoid or reduce corrosion on the raceways of the outer ring caused by condensation forming on the outer raceway, the outer ring has at least one radially-outwardly-extending groove in the axial region between its at least two raceways for collecting condensation at a location away from the raceways.

Abstract: A blade bearing for mounting a blade of a wind turbine to a hub of the wind turbine comprises inner and outer rings arranged next to each other. One of the inner and outer rings is configured to mount to the blade, and the other is configured to mount to the hub. At least two rows of rolling elements are positioned between the inner and outer rings. Upper and lower rows of the rolling elements are located in respective upper and lower planes. A support structure is secured to the inner ring and extends in a substantially radial direction between the upper and lower planes. The support structure has non-uniform stiffness characteristics in a circumferential direction. A method of manufacturing a blade bearing is also provided.

Abstract: A rotation support device for a pinion shaft is configured such that, together with being able to sufficiently maintain axial rigidity of a rolling bearing on the side opposite from the pinion gear side, it is able to sufficiently reduce the dynamic torque during operation and the starting torque at the start of operation. Together with using a single-row angular contact ball bearing as the rolling bearing on the side opposite from the pinion gear side, the ratio of the radius of curvature Ro of the outer raceway and the diameter Bd of the balls (Ro/Bd) is regulated within the range 0.52<Ro/Bd?0.56, and the contact angle ? is regulated within the range of 35° to 40°.

Abstract: A wheel bearing unit comprises an inner ring and an outer ring. The outer ring is mounted rotatably and is arranged concentrically with respect to the inner ring. The inner ring serves to receive a wheel and the outer ring serves for fastening to a wheel support of a motor vehicle. The wheel bearing unit has, between the inner ring and the outer ring, a first ball row and a second ball row which is arranged parallel to the first ball row. A follower is arranged in a rotationally fixed manner with respect to an outer side of the inner ring between the first ball row and the second ball row. The follower is connected directly or indirectly to a rotor of an electric machine in a torque-transmitting manner.

Abstract: A multiple-row ball bearing arrangement, which has at least one inner bearing ring and at least one outer bearing ring which are coaxially disposed on a longitudinal axis. The multiple-row ball bearing arrangement also has a plurality of balls disposed between the inner and the outer bearing rings in at least one first ball row and a second ball row adjacent to the first ball row, and a first cage for guiding the balls of the first ball row and a second cage for guiding the balls of the second ball row. The first and the second cage each have a first and a second cage side ring. The first cage side ring of the first cage and the second cage side ring of the second cage are adjacent to each other and, at least in some sections, are arranged so as to overlap along the longitudinal axis.

Abstract: A rolling-element bearing includes an inner ring and an outer ring having at least two adjacently disposed raceways for at least two rows of rolling elements. In order to avoid or reduce corrosion on the raceways of the outer ring caused by condensation forming on the outer raceway, the outer ring has at least one radially-outwardly-extending groove in the axial region between its at least two raceways for collecting condensation at a location away from the raceways.

Abstract: To prevent a problem due to gas produced from an adhesive and to improve the productivity of a rolling bearing apparatus. The present invention provides a method of manufacturing a rolling bearing apparatus, including fitting a first rolling bearing and a second rolling bearing to a first member each in a pressed state, pressing the inner races of the first and second rolling bearings in a direction in which they are closer to each other in the axial direction with a second member sandwiched between outer races of the first and second rolling bearings, and welding at least a portion of a peripheral portion of the inner race of the pressed second rolling bearing in the axial direction to the outer face of the first member through irradiation with laser light.

Abstract: A bearing device having a bearing which rotatably supports a shaft, and a safety bearing (1) which receives the shaft in the event of a failure of the bearing. The aim of extending the service life of the safety bearing in the bearing device described above is achieved according to the invention in that a bearing race (2) of the safety bearing (1) facing the shaft comprises a lateral surface (3) having a convex contour (4) facing toward the shaft.

Abstract: A method of manufacturing a rolling bearing device which can improve operational efficiency and can enhance productivity thereof is provided. The method includes the steps of: applying an adhesive agent to fitting portions formed between inner rings of two rolling bearings which are arranged coaxially in a spaced-apart manner in an axial direction and a shaft which is fitted in the inner rings and fitting portions formed between outer rings of two rolling bearings and a sleeve which is fitted on the outer rings; bringing the inner rings and the shaft into fitting engagement and the outer rings and the sleeve into fitting engagement respectively; and welding, in a state where the inner rings to which the adhesive agent is applied in the adhesive agent applying step are brought close to each other due to pushing of the inner rings in the axial direction, the pushed inner rings to the shaft by laser welding using laser power which does not generate thermal deformation of the pushed inner rings.

Abstract: An assembly for a turbocharger includes a ball bearing cartridge, a center housing with a bore, a turbine end counterbore and a compressor end surface that includes a recess, and a compressor backplate with an axial extension configured to fit into the recess where the counterbore and the backplate define, at least in part, an axial length of a bearing cartridge chamber. Various other devices, assemblies, etc., are also disclosed.

Abstract: An assembly for a turbocharger and a method of assembling a turbocharger are disclosed. Such an assembly can include an elongate pin having a tapered part and a protrusion at one end of the pin. The elongate pin is configured to be inserted within a housing opening and a cartridge opening such that the taper of the body portion of the pin mates with the taper of the housing opening. The cartridge opening is configured as to mate with the pin such that the pin substantially restricts the bearing cartridge from surging and rolling but substantially permits all other movements of the bearing cartridge.

Abstract: A ballscrew assembly may comprise a ballscrew having an axially distributed ballscrew groove about a circumference of the ballscrew, an extended top plate having an axially distributed extended top plate groove, and an axially distributed thrust bearing disposed in a space bounded by the axially distributed ballscrew groove and the axially distributed extended top plate groove.

Abstract: A method for filling a ball roller bearing with roll bodies, and a ball roller bearing, which is filled according to the method and has an outer and an inner bearing ring and a plurality of ball rollers, which are arranged between these bearing rings and have two side surfaces, which are flattened symmetrically from a basic spherical shape, parallel to one another and held at uniform distances from one another by a bearing cage. The ball rollers roll in groove-shaped raceways recessed in the inner face of the outer bearing ring and the outer face of the inner bearing ring. The ball roller bearing is filled by an eccentric axial, tilting fitting of the ball rollers through the interval between the bearing rings in the form, that the filled ball roller bearing is filled to the extent of about 94% and has a service life of up to 253%.

Abstract: In a double row rolling bearing for supporting a pinion shaft, an outer ring is fixed to an inner peripheral surface of an annular wall (case) with its axis disposed horizontally, and an inner ring assembly is fitted on a pinion shaft, and is inserted, together with the pinion shaft, horizontally into the outer ring through a larger-diameter opening of the outer ring, and is mounted in the outer ring. A larger-diameter cage has a drop limitation portion for limiting the vertically-downward movement of the larger-diameter case.

Abstract: Double row angular contact ball bearing (10) has split inner rings (18, 24) and two plastic comb snap cages (32, 44). The comb cage has retaining tabs (38, 50) which mate with retaining grooves (22, 28) in the split inner rings. These retaining tabs hold the inner rings into the bearing.

Abstract: A multiple-row ball bearing arrangement, which has at least one inner bearing ring and at least one outer bearing ring which are coaxially disposed on a longitudinal axis. The multiple-row ball bearing arrangement also has a plurality of balls disposed between the inner and the outer bearing rings in at least one first ball row and a second ball row adjacent to the first ball row, and a first cage for guiding the balls of the first ball row and a second cage for guiding the balls of the second ball row. The first and the second cage each have a first and a second cage side ring. The first cage side ring of the first cage and the second cage side ring of the second cage are adjacent to each other and, at least in some sections, are arranged so as to overlap along the longitudinal axis.

Abstract: A wheel bearing has an outer member and a pair of inner rings. Double row balls are freely rollably contained between the outer and inner raceway surfaces, via cages, of the outer member and inner rings. A counter portion is formed near a groove bottom of the inner raceway surface. The counter portion has a diameter larger than a groove bottom diameter by a predetermined clearance. The counter portion is formed by a cylindrical portion and a tapered portion. The cylindrical portion axially extends from the inner raceway surface. The tapered portion reduces from the cylindrical portion toward a smaller end face of the inner ring. A transition portion, between the counter portion and the inner raceway surface, is smoothly formed by an arc with a radius of curvature 2.0-10.0 mm.

Abstract: Rolling bearing, for a tensioning roller, comprising an inner race, an outer race mounted so as to rotate about the inner race and at least one row of rolling elements placed between the inner race and outer race, the said inner race comprising an axial portion extending axially beyond the outer race. The rolling bearing comprises an insert fitted into an open-ended bore made in the axial portion of the inner race.

Abstract: The rolling bearing has a first bearing ring, a second bearing ring and a plurality of rolling bodies which are arranged between the first bearing ring and the second bearing ring. The rolling bodies are arranged in at least four rows. At least two rows have a first reference diameter and at least two further rows have a second reference diameter which is different from the first reference diameter, and those rows which have the same reference diameter are arranged symmetrically with respect to a predefined plane which is aligned perpendicular to a longitudinal direction of the bearing.

Abstract: An asymmetric wheel hub assembly with two rows of rolling elements of different pitch diameters has a central axis of rotation and inner raceway and outer raceways for each row of elements, the associated inner and outer raceways being axially displaced in accordance with a respective angle of contact and along a respective load line such that the assembly is capable of accommodating combined loading. The raceways of each row of rolling elements have osculation ratios which are defined by the ratio between the radius of curvature of the raceways and the outside diameters of the rolling elements of the associated row of rolling elements. The angle of contact and the osculation ratios of a first one of the two rows of the rolling elements is different than the angle of contact and osculation ratios of a second one of the two rows of the rolling elements.

Abstract: A wheel hub assembly with two rows of rolling elements has a central axis of rotation and inner raceway and outer raceways for each row of elements, the associated inner and outer raceways being axially displaced in accordance with a respective angle of contact and along a respective load line such that the assembly is capable of accommodating combined loading. The raceways of each row of rolling elements have osculation ratios which are defined by the ratio between the radius of curvature of the raceways and the outside diameters of the rolling elements of the associated row of rolling elements. The osculation ratios of a first one of the two rows of the rolling elements are different than the osculation ratios of a second one of the two rows of the rolling elements.

Abstract: A wheel hub assembly with two rows of rolling elements has a central axis of rotation and inner raceway and outer raceways for each row of elements, the associated inner and outer raceways being axially displaced in accordance with a respective angle of contact and along a respective load line such that the assembly is capable of accommodating combined loading. The angle of contact of a first one of the two rows of rolling elements has a magnitude different than the magnitude of the angle of contact of a second one of the two rows of rolling elements.

Abstract: A wheel hub assembly with two rows of rolling elements has a central axis of rotation and inner raceway and outer raceways for each row of elements, the associated inner and outer raceways being axially displaced in accordance with a respective angle of contact and along a respective load line such that the assembly is capable of accommodating combined loading. The raceways of each row of rolling elements have osculation ratios which are defined by the ratio between the radius of curvature of the raceways and the outside diameters of the rolling elements of the associated row of rolling elements. The angle of contact and the osculation ratios of a first one of the two rows of the rolling elements are different than the angle of contact and osculation ratios of a second one of the two rows of the rolling elements.

Abstract: A linear actuator includes a thrust bearing that is integral to the actuation member. The actuator includes a translation member and an actuation member. The actuation member is responsive to a drive force to rotate. The translation member is configured to translate in response to actuation member. The thrust bearing is coupled to the actuation member and includes an inner race, an outer race, and a plurality of balls. The thrust bearing is configured as a zero lead ballscrew, with the inner race integrally formed on the actuation member, and the plurality of balls disposed between the inner and outer races.

Abstract: The invention relates to an anti-friction bearing comprising a first bearing race, a second bearing race and a plurality of anti-friction bodies that are located between the first bearing race and the second bearing race. According to the invention, the anti-friction bearings are arranged in several rows, which are asymmetrical in the longitudinal direction of the anti-friction bearing in relation to any plane that runs perpendicularly to said longitudinal direction of the anti-friction bearing.

Abstract: A vehicle wheel bearing apparatus has an outer member; an inner member and double row balls freely rollably contained between outer raceway surfaces and inner raceway surfaces. An inner ring is axially secured relative to a wheel hub by a caulked portion. The caulked portion is formed by plastically deforming the cylindrical portion radially outward. The wheel hub is formed from medium-high carbon steel including carbon of 0.40-0.80% by weight and with a ferrite grain size number selected larger than #3.

Abstract: The large diameter cage has an asymmetric shape, a diameter (discharge diameter) of which close to an opening is larger than a diameter (inflow diameter) close to the small diameter cage, and the small diameter cage has a symmetric shape, in which a diameter (inflow diameter) of which close to an opening is equal to a diameter (discharge diameter) close to the large diameter cage.

Abstract: A slewing bearing includes: an outer ring section having first and second circumferential grooves formed on an inner circumferential surface in parallel; an inner ring section formed on an inner side of the outer ring section and having first and second circumferential grooves formed on an outer circumferential surface in parallel in correspondence to the first and second circumferential grooves of the outer ring section; a first row of rolling elements provided in the first circumferential groove of the outer ring section and the first circumferential groove of the inner ring section; and a second row of rolling element provided in the second circumferential groove of the outer ring section and the second circumferential groove of the inner ring section. The inner ring section rotates via the first and second rolling element rows around a rotation axis in a relatively opposite direction to the outer ring section.

Abstract: Provided are: a double-row angular bearing capable of enhancing its rolling life and cost reduction; a bearing device for a wheel, which is capable of reducing a number of assembling process steps in an assembly factory of automobiles and the like, is excellent in productivity, and is capable of cost reduction; and a method of producing an outer race and an inner race of a bearing, which can achieve their weight reduction to a large extent. The double-row angular bearing includes: an inner race having inner rolling surfaces on a radially outer surface thereof; an outer race having outer rolling surfaces on a radially inner surface thereof; and rolling elements rotatably housed between the outer rolling surfaces of the outer race and the inner rolling surfaces of the inner race. The outer race or the inner race is formed of a plastically worked article formed by cold rolling.

Abstract: Double row angular contact ball bearing (10) has split inner rings (18, 24) and two plastic comb snap cages (32, 44). The comb cage has retaining tabs (38, 50) which mate with retaining grooves (22, 28) in the split inner rings. These retaining tabs hold the inner rings into the bearing.

Abstract: A double-row roller bearing comprises a one-piece bearing ring, a bearing ring that is split in the axial direction, and rolling bodies that are arranged between the two bearing rings. The rolling body of the first row has a first diameter, and the rolling body of the second row has a second diameter that is different to the diameter of the rolling body of the first row. The rolling bodies consist of a ceramic material, and the contact angle of the first rolling body row is different to the contact angle of the second rolling body row.

Abstract: A bearing device for a wheel, in which circumferential play is minimized and in which a hub ring and an outer joint member of a constant velocity universal joint can be connected with excellent workability. Axially extending projections (35) are formed on either one of the outer diameter surface of a shaft (12) of the outer joint member and the inner diameter surface (37) of a hole (11) of the hub ring (1), and the projections (35) are axially press fitted into the other. Recesses (36) fitted in an intimate contact manner onto the projections (35) are formed in the other. Thus, a recess/projection fitting structure (M) is formed. In the structure (M), the entire fitting/contact portions (38) of the projections (35) and the recesses (36) are in intimate contact with each other. Further, a shaft come-out prevention structure (M1) is provided between the shaft (12) of the outer joint member and the inner diameter surface of the hub ring (1).

Abstract: The invention is based on the object of developing an angular-contact ball bearing in a tandem arrangement and a corresponding bearing arrangement. The invention proposes an angular-contact ball bearing (1) having an outer ball row (5), an inner ball row (4) and at least one common bearing race (2) which guides the two ball rows (4, 5), wherein the outer ball row (5) is guided in the angular-contact ball bearing (1) by a two-point bearing arrangement and the inner ball row (4) is guided in the angular-contact ball bearing (1) by a four-point bearing arrangement, and wherein the balls of the outer ball row (5) have a larger diameter than the balls of the inner ball row (4).

Abstract: A bearing arrangement includes a bearing outer element that defines a first plurality of races opening radially inwardly, a bearing inner element that defines a second plurality of races opening radially outwardly, and a bearing middle element defining a third plurality of races at its radially outer surface thereof and a fourth plurality of races at its radially inner surface thereof. Rolling elements are receivable in the races. The bearing middle element includes an axial protrusion at least at one end thereof that can be received in a housing with respect to which the bearing outer and inner elements are rotatable.

Abstract: There is provided a hub bearing unit with multiple rows of rolling elements. A hub has one or more inner race surfaces. An inner ring is seated on an outer peripheral surface of the hub and has one or more inner race surfaces thereon. An outer ring is formed with outer race surfaces as many as inner race surfaces formed at the hub and the inner ring. Rolling elements are disposed between the outer race surfaces and the inner race surfaces. Cages are disposed to maintain circumferential intervals of the rolling elements. The outer ring is formed with three or more outer race surfaces. The rolling elements are arranged in three or more rows. The arrangement of multiple-row rolling elements enhances the life of the bearing. Manufacturing costs are curtailed and rolling resistance is reduced compared to the tapered roller bearing.

Abstract: A vehicle wheel bearing apparatus has an outer member, an inner member double row rolling elements, and a constant velocity universal joint. A wheel hub of the inner member and an outer joint member of the constant velocity universal joint are axially separably connected. The outer joint member shoulder portion abuts against a caulked portion of the wheel hub. A cap is interposed between the caulked portion and the shoulder portion. The cap is press-formed from a steel plate and has a surface roughness of 0.63 Ra or less.