There is provided a method capable of producing a wheel-supporting rolling bearing unit at low cost. In an event of producing a wheel-supporting rolling bearing unit, a cylindrical portion formed in an axial end portion of a hub ring is inserted through an inner ring, swing caulking is performed by pressing a die against a tip end portion of the cylindrical portion protruding to an axial end portion side more than the inner ring and an axial end surface of the inner ring is held by a caulked portion formed by caulking and expanding the tip end portion of the cylindrical portion radially outward. In such a way, the inner ring and the hub ring are fixed integrally witch each other. At this time, a swing angle of the swing caulking is set at 15 degrees or more to 30 degrees or less.

A bearing device 1 for a vehicle wheel, wherein an outer member 2 (specifically, a work piece W serving as the material for the outer member 2) is a plastic work piece in which an open hole (specifically, an open hole Wh of the work piece W) in an outer-side end part is pushed out from the inner sides, and the outer periphery of the outer member 2 has a thick part 2f that is enlarged radially outward.

An assembling device including: a bearing setting unit configured to set a bearing unit such that the bearing unit is coaxial with respect to a hub cylindrical part and can be moved toward the hub cylindrical part, a rotational drive source configured to transmit rotational force around an axis to the bearing unit set in the bearing setting unit; and an inner-ring press-fitting unit configured to externally fit a inner rings of the bearing unit to which the rotational force around the axis has been transmitted, to the hub cylindrical part.

An assembling device including: a bearing setting unit configured to set a bearing unit such that the bearing unit is coaxial with respect to a hub cylindrical part and can be moved toward the hub cylindrical part, a rotational drive source configured to transmit rotational force around an axis to the bearing unit set in the bearing setting unit; and an inner-ring press-fitting unit configured to externally fit inner rings of the bearing unit to which the rotational force around the axis has been transmitted, to the hub cylindrical part.

A hub-bearing assembly for rotatably mounting a motor vehicle wheel on a suspension strut having a wheel hub to support the wheel of the vehicle and having an axial shoulder, a bearing unit providing a radially outer stationary ring constrained to the strut; a first radially inner rotating ring mounted on the hub, and a second radially inner rotating ring defined by the hub, two rows of rolling bodies interposed between the radially outer stationary ring and the two radially inner rotating rings inside a first raceway and a second raceway formed, respectively, the first inner ring providing a substantially non-deformable Hertzian portion, on which is formed the second raceway, and an accumulation portion integral with the Hertzian portion and interposed between the Hertzian portion and the axial shoulder for accumulating elastic energy during cold deformation to obtain the rolled edge.

An assembling method includes fitting an entire range of the guide portion to the stem section with a gap therebetween, and inserting a bolt from an outboard side through a bolt insertion hole formed in the hub wheel. In this state, a maximum inclination angle of the bolt with respect to the hub wheel is set to be larger than a maximum inclination angle of the outer joint member with respect to the hub wheel. The method also includes connecting the bearing and the constant velocity universal joint to each other by threadedly engaging and fastening the bolt into a bolt hole formed in the stem section.

An axial section of a continuous portion where an outer peripheral surface of a spindle portion of a main spindle in which a punch is installed is continuous with an outer peripheral surface of a punch holder is formed of a first circular arc joined to the outer peripheral surface of the spindle portion and a second circular arc joined to the outer peripheral surface of the punch holder. The first circular arc and the second circular arc are in contact with each other. The second circular arc is smaller than the first circular arc in curvature radius.

A bearing device for a wheel has a stem shaft of an outer joint member of a constant-velocity universal joint fit and inserted in a hole of a hub wheel, the stem shaft and hub wheel being coupled through an intermediation of a recess-projection fitting structure. Projections extending in an axial direction are provided on one of the stem shaft and an inner diameter surface of the hole of the hub wheel. The projections are press-fit into another of the stem shaft and the inner diameter surface of the hole along the axial direction. Recesses that adhere to and fit the projections are formed in the other. An end on an inboard side of the hub wheel is caulked to an outer diameter side to form a caulking section and preload is applied to a roller bearing by the caulking section.

The inspection device of the swing forging apparatus includes an inspection tool and a laser irradiation surface. When inspecting the swing forging apparatus, the inspection tool is supported to the head to which the processing roll is not supported, with a substantially same condition as the processing roll, and the inspection tool has a function of emitting a laser beam onto a central axis of the inspection tool. When inspecting the swing forging apparatus, the laser irradiation surface is arranged so that a relative position of the laser irradiation surface to the head in an axial direction of the head can be changed and the laser beam can be irradiated to the laser irradiation surface.

Rotary forging for forming a hub-side face spline is started in a state in which a caulking section is made to come in contact with a flat surface section that is an inner end surface of an inner ring in an axial direction and a chamfer. In addition, a contact portion between an inner end surface of the caulking section in the axial direction and a processing surface of a roll at the beginning of the rotary forging overlaps a contact portion between the caulking section and the flat surface section and the chamfer of the inner ring in the axial direction.