A bearing device for a vehicle wheel includes an outer member which is a plastic work piece in which an open hole in an outer-side end part is pushed out from inner sides, and an outer periphery of the outer member has a bulged part that is enlarged radially outward.

An inner-ring restraint device of a hub bearing capable of restraining an inner ring efficiently without applying a load to the hub bearing. An inner-ring restraint device includes a restraint ring allowing a plurality of pieces to be arranged to form a ring shape and restricting an inner ring of a hub bearing by reducing a diameter, a support plate having a ring shape coaxial with the hub bearing, being provided so as to move in an axial direction and supporting the restraint ring at a position closer to the hub bearing for the vehicle than the restraint ring in the axial direction and a ring-shaped operation plate connected to the support plate so as to relatively move in the axial direction and applying a pressure in a direction of reducing the diameter to the restraint ring by coming relatively close to the support plate.

A wheel bearing assembly may include a wheel hub having a hub flange; one or more inner rings configured to be mounted to one side of the wheel hub; an outer ring provided radially outward of the one or more inner rings; a spacer coupled to a vehicle-body-side end portion of an inner ring disposed on a vehicle-body-side; and one or more rolling elements provided between the one or more inner rings and the outer ring. The one or more inner rings may be configured to be held on the wheel hub by plastically deforming a vehicle-body-side end portion of the wheel hub in a radially outward direction. A plurality of recesses for accommodating rotating elements of a constant velocity joint may be formed on an inner peripheral surface of the vehicle-body-side end portion of the wheel hub in a spaced-apart relationship with each other along a circumferential direction.

A unitized wheelend is provided. The unitized wheelend includes a hub having an inboard side bounded by an oil seal and an outboard side bounded by a retainer releasably coupled to the hub. The unitized wheelend assembly includes an inboard bearing assembly, a spacer, an outboard bearing assembly, and a spindle nut assembly.

An amount of decrease C in an axial clearance of a hub unit bearing is found based on an amount of expansion D of an inner ring of the hub unit bearing, which is the difference between the outer-diameter dimension D1 of the inner ring after the inner ring is externally fitted with a tubular fitting portion of a hub spindle of the hub unit bearing and after formation of a swaged portion of the hub spindle, the inner ring being held between the swaged portion and a stepped surface of the hub spindle, and an outer-diameter dimension D0 of the inner ring before the inner ring is externally fitted with the tubular fitting portion.

Provided are an oil receiver (20) having an annular recess portion (52) which faces an entire circumference of an outer circumferential edge of a concave spherical portion (36), and a guide member (21) which guides lubricating oil, which has flowed out from a spherical engagement portion between a convex spherical portion (24) and a concave spherical portion (36), toward an annular recess portion (52).

Provided are an oil pan (20) which has an annular recess portion (52) facing an outer circumferential edge of a spherical concave portion (36) throughout a whole circumference; and a cover (21) which is constituted in a tubular shape, of which one axial end portion is rotatably supported by a part adjacent to a radially inner side of the annular recess portion (52), and of which an axially opposite end portion is rotatably supported by a part of a shaft-equipped spherical seat (18) on the one axial end side.

A unitized wheelend is provided. The unitized wheelend includes a hub having an inboard side bounded by an oil seal and an outboard side bounded by a retainer releasably coupled to the hub. The unitized wheelend assembly includes an inboard bearing assembly, a spacer, an outboard bearing assembly, and a spindle nut assembly.

An inner-ring restraint device of a hub bearing capable of restraining an inner ring efficiently without applying a load to the hub bearing. An inner-ring restraint device includes a restraint ring allowing a plurality of pieces to be arranged to form a ring shape and restricting an inner ring of a hub bearing by reducing a diameter, a support plate having a ring shape coaxial with the hub bearing, being provided so as to move in an axial direction and supporting the restraint ring at a position closer to the hub bearing for the vehicle than the restraint ring in the axial direction and a ring-shaped operation plate connected to the support plate so as to relatively move in the axial direction and applying a pressure in a direction of reducing the diameter to the restraint ring by coming relatively close to the support plate.

A method of manufacturing a rolling bearing unit for supporting a wheel includes detecting a current value flowing through an electric motor (19) configured to drive a roll (22) and determining a time to terminate a caulking process on the basis of the detected value when a caulking section (13) is formed by pressing the roll (22), inclined with respect to a central axis of a hub main body (7) and supported in a rotatable state about a central axis of the roll, against a cylindrical section (12), installed on an inner end portion of the hub main body (7) in the axial direction, while the roll (22) is rotated about the central axis of the hub main body (7).