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.

An outer joint member and a hub wheel are coupled to be able to transmit torque by meshing face splines respectively provided and applying a tightening force in an axial direction between both the face splines. Shapes of tooth surfaces of the face splines are determined such that, when bringing the face splines close to each other in the axial direction and meshing them with each other, tooth surfaces of the face splines first come into contact with each other in, among an outer diameter portion of a meshing region between both the face splines, an inner diameter portion, and an intermediate portion sandwiched between the outer diameter portion and the inner diameter portion, one of the outer and inner diameter portions, and then the tooth surfaces of both the face splines come into contact with each other in the other of the outer and inner diameter portions.

A hub bearing unit includes a radially outwardly extending flange, a first portion on a first side of the flange and a tubular portion on a second side of the flange. A bearing outer ring surrounds the first portion, and rolling elements are mounted between the first portion and the outer ring. A splined shaft of a constant velocity joint extends into the hub and has a threaded end portion inside the tubular portion. A threaded connector is mounted on the threaded end portion and has a deformable portion configured to be deformed to prevent the threaded connector from being unscrewed. A portion of the tubular portion near the flange includes a radial through hole configured to allow a torque arm of a deformation tool to access and deform the deformable portion.

In a wheel bearing device, an axial end surface of a hub 1 of a wheel bearing 6 and an axial end surface of an outer joint member 20 of a constant velocity universal joint 7 are coupled by a recess-and-protrusion fitting structure (face spline structure X) in a torque transmittable manner. An inner peripheral surface of the hub 1 of the wheel bearing 6 and an outer peripheral surface of the outer joint member 20 of the constant velocity universal joint 7 are fitted to each other.

A hub-bearing unit is provided with: a rotatable hub, with an axially outer flange portion configured for engagement with a rotatable element of a motor vehicle, a bearing unit provided with a fixed radially outer ring, configured for engagement with a fixed element of the motor vehicle, a first, axially outer, crown of rolling bodies, and a second, axially inner, crown of rolling bodies, interposed between the radially outer ring and the hub. The hub also assumes the function of the radially inner ring of the bearing unit and the bell of a constant velocity joint. The hub-bearing unit is designed so that the axial distance between the center of the axially inner crown of rolling bodies and the rolling center of the constant velocity joint lies within a predetermined range according to the following formula:

A kingpin unit bearing steerable drive axle for a powered wheel of a vehicle may include a steering knuckle having a first side and a second side, and a unit bearing configured to support a wheel and operatively connected to the first side of the steering knuckle. An axle housing is operatively connected to the second side of the steering knuckle, and the axle housing has an upper arm and a lower arm. A first kingpin connects the upper arm of the axle housing to the steering knuckle; and a second kingpin connects the lower arm of the axle housing to the steering knuckle. The steering knuckle and the axle housing are configured to receive a powered axle shaft to drive the unit bearing.

The invention provides a coating film having excellent adhesion, even without a chemical conversion film treatment being carried out as an undercoat treatment, and a metal automotive part having the coating film. A powder is deposited by powder-coating onto the surface of a metal automotive part that has been quenched after forging, and tempering of the metal automotive part and bake-hardening of the deposited powder are carried out simultaneously, thereby forming a skin film on the surface of the metal automotive part. The surface of the metal automotive part before the powder is powder-coated thereon is a work-hardened basis material surface that has been not subjected to a chemical conversion filming treatment.

The present invention provides a wheel bearing device including a wheel bearing supported by a knuckle; a hub ring having a boss portion; a second constant-velocity joint; and a first constant-velocity joint. The second constant-velocity joint includes an outer ring rotatably supported by the wheel bearing, and an inner ring coupled to the boss portion of the hub ring. The first constant-velocity joint includes an outer ring coupled to the outer race of the second constant-velocity joint, and an inner ring coupled to a drive shaft. The knuckle supports a pair of camber angle-adjusting linear motion actuators, and a pair of toe angle-adjusting linear motion actuators.

A rear portal trailing arm assembly for a vehicle rear suspension that includes a CV joint hub for coupling with a transaxle and a wheel hub for coupling with a rear wheel. A gear transfer case extends rearward from the CV joint hub to an axle case and functions similarly to a rear trailing arm. Forward mounts facilitate coupling the gear transfer case to the chassis such that the trailing arm assembly pivots vertically with respect to the chassis. A rearward mount facilitates coupling a strut with the gear transfer case to control the vertical motion of the rear wheel. Multiple gear assemblies are meshed within the gear transfer case. An axle is coupled with the meshed gear assemblies and housed within the axle case, such that torque applied to the CV joint hub is communicated to the wheel hub.

The present invention relates to a boot assembly of a drive axle in which a bearing seal of a wheel bearing is removed to reduce drag torque and also reduce friction noise occurring in a wrinkled portion of the boot, and introduces a boot assembly of a drive axle configured to include: a wheel bearing assembled to a wheel housing; an outer ring formed in a ring shape and having an outer diameter part fixed to an outer wheel of the wheel bearing; a boot having a large diameter part of one end thereof, assembled to an inner diameter part of the outer ring; and a bearing seal unit assembled between a small diameter part of the other end thereof and a driveshaft by a band to prevent the introduction of foreign matter while restricting the rotation of the boot.