A wheel bearing arrangement for a motor vehicle includes a wheel hub. The wheel hub is connected to a wheel flange. A multi-row rolling element bearing is mounted on the wheel hub. The bearing has an outer ring and at least one inner ring which is axially prestressed by a collar of the wheel hub. A zinc flake coating is formed on at least part of the wheel bearing arrangement to improve corrosion protection.

Flanged inner ring of a rolling bearing forming part of a wheel hub unit of motor vehicles, having at its axially inner end a rolling edge configured to preload axially a radially inner ring after being plastically deformed by orbital forming. The rolling edge is provided with a conical surface of an axially inner portion of the rolling edge. A first parameter is defined as being the ratio between the conicity of the conical surface expressed in degrees and the thickness of the rolling edge expressed in millimeters and assumes values ranging between 0.03 mm.sup.1 and 2 mm.sup.1.

A wheel hub assembly for motor vehicles, having a rotatable hub, a bearing unit in turn comprising a radially outer ring, a radially inner ring and a plurality of rolling bodies. The axial interface between the wheel hub assembly and a knuckle of a motor vehicle suspension provides at least one piezoelectric spacer configured to detect first mechanical vibrations coming from the components of the wheel hub assembly and to implement corrective action consisting of second mechanical vibrations of almost equal amplitude but with opposite direction and phase, so that the resultant of the first and second mechanical vibrations is close to zero.

A cage of an angular ball bearing includes, with respect to a plurality of balls arranged between an outer member and an inner member, an annular portion positioned on one side in an axial direction of the angular ball bearing, and a plurality of pillar portions provided to extend from the annular portion to the other side in the axial direction. The pillar portions include a first flat surface portion contactable with the balls on one side in a circumferential direction of the angular ball bearing, and a second flat surface portion contactable with the balls on the other side in the circumferential direction and parallel to the first flat surface portion.

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.

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.

A method for manufacturing a rolling bearing unit is provided to periodically reciprocate a stage (38) in a vertical direction by rotating and driving a servo motor (44) while rotating a roll about a central axis of a hub main body using a roll driving motor (43) in a state in which a processing surface of the roll is pressed against other end surface of a caulking section in an axial direction. A period of the reciprocation is restricted by a relation between a rotation position of the roll about the central axis of the hub main body and an engaged state between concave sections, which are sections between a plurality of processed teeth formed in the processing surface of the roll, and a face spline tooth formed by the concave 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.

A rotary press device (33) includes a restriction section (36) configured to restrict a motion of a roll (30) around a central axis of a roll (30) against movement of the roll (30) around a central axis of a hub main body (8) during rotary forging. In an example, the restriction section (36) has guide teeth (44) meshed with teeth formed on a processing surface of the roll (30).

A rotary press device (33) includes a restriction section (36) configured to restrict a motion of a roll (30) around a central axis of a roll (30) against movement of the roll (30) around a central axis of a hub main body (8) during rotary forging. In an example, the restriction section (36) has guide teeth (44) meshed with teeth formed on a processing surface of the roll (30).