A wheel bearing includes a constant velocity universal joint and a wheel bearing. The wheel bearing is separably coupled to the constant velocity universal joint with a screw fastening structure, in which a stem section of an outer joint member of the constant velocity universal joint is fitted to an inner diameter portion of the hub wheel. Projecting portions extending in an axial direction are formed on the stem section of the outer joint member, and depressed portions having an interference with respect to the projecting portions are formed on the hub wheel. The stem section of the outer joint member is press-fitted to the hub wheel, and a shape of the projecting portions is transferred to the other, to thereby provide a projection and depression fitting structure in which the projecting portions and the depressed portions are in close contact at an entire fitting contact portion therebetween.

The present invention relates to a structure and a method for coupling a wheel bearing that include a wheel hub for mounting a vehicle wheel, a hollow inner ring press-fitted into an end portion of the wheel hub, an annular outer ring disposed at a radial exterior of the wheel hub and the inner ring, and rolling elements disposed between the wheel hub or the inner ring and the outer ring, wherein the wheel hub and the inner ring are splined to each other and the inner ring and the joint member are coupled through facial spline. According to the present invention, driving torque of a constant velocity joint may be stably delivered to the wheel hub and noise may be reduced.

A bearing device for a wheel includes a bearing. The bearing includes outer and inner members and double-row rolling elements. The bearing has a constant velocity universal joint coupled thereto in a torque transmittable manner by fitting a stem section of an outer joint member to a shaft hole of a hub wheel, in which the stem section of the outer joint member is press-fitted to the shaft hole of the hub wheel, and shapes of only the circumferential side wall portions of each of a plurality of convex portions are transferred to the shaft hole, to thereby define a convex and concave fitting portion in which close contact is achieved at an entire contact portion between the plurality of convex portions and the plurality of concave portions.

An outer joint member for a constant velocity universal joint is formed by a face spline forming apparatus and a face spline forming method. The face spline forming apparatus includes a punch member having a tooth portion for forming a face spline, a pedestal having an end-surface receiving surface for receiving an opening end surface of a cup section, and a shaft member having an inner-surface receiving surface for receiving a bottom-wall inner surface of the cup section. The opening end surface and the bottom-wall inner surface are brought into a simultaneous pressure receiving state. In this state, the punch member performs a rocking motion to form the face spline in a bottom-wall back surface due to plastic deformation caused by the tooth portion of the punch member.

Disclosed are a drive wheel bearing and a method of manufacturing the same. The drive wheel bearing includes: a wheel hub which is integrally and rotatably fastened to a vehicle wheel; an inner race which is fitted with the wheel hub and integrally and rotatably coupled to the wheel hub; an outer race which rotatably supports the wheel hub and the inner race in a state in which the wheel hub and the inner race are fitted into the outer race; rolling elements which are interposed between the outer race and the wheel hub and between the outer race and the inner race; and a constant velocity joint which is integrally and rotatably connected to the wheel hub or the inner race by means of a face spline in order to receive power from an engine and transmit the received power to the vehicle wheel, in which the face spline of each of the wheel hub and the constant velocity joint have a structure in which teeth having the same size and tooth grooves having the same size radially extend, and are alternately and continuously arranged in a circumferential direction, and as a result, it is possible to smoothly transmit rotational power of the engine to the vehicle wheel through the wheel bearing.

A hub-bearing unit with an axis of rotation includes a stationary, radially external ring, a radially internal flanged hub, rotatable about the axis and including a first shoulder, a second shoulder, a first relief groove, and a section (SR) radially opposite the first relief groove. At least one row of rolling bodies is interposed between the external ring and the flanged hub. The hub-bearing unit includes a first radial ball bearing and a second radial ball bearing interposed between a stem of a constant velocity joint and the flanged hub and opposite the first shoulder and the second shoulder. The second ball bearing mounts inside a seat of the flanged hub and a spacer axially abuts the second shoulder and mounts inside the seat between the second shoulder and the second ball bearing. The seat includes a second relief groove formed in an axially external position relative to section (SR).

A vehicular wheel hub unit includes a radially outer bearing ring, a radially inner bearing ring, and a plurality of rolling elements supporting the inner bearing ring and the outer bearing ring for relative rotation. The inner bearing ring has an axially facing metal coupling surface configured to frictionally engage a connecting surface of an element, such as a bell of a constant velocity joint, adjacent to the inner bearing ring, and the coupling surface includes at least one first region having a plurality of coupling surface ablations configured to affect an amount of friction between the coupling surface and the connecting surface. Also a method including ablating at least a first region of a coupling surface of an inner bearing ring.

In a wheel bearing device (1): a ratio of an axial direction length C of a recessed portion (3h) formed in a through-hole (3e) of a hub ring (3) to a pitch circle diameter A of the recessed portion formed in an inner circumferential surface of the hub ring is 0.7(C/A)1.07; a ratio of an axial direction distance E between a flange surface (3j) of a wheel attachment flange (3b) and an inner end surface (4b) of an inner race (4) to an inter-ball pitch F between an inner ball row (5) and an outer ball row (6) is 2.85(E/F); and a ratio of the axial direction distance E to a pitch circle diameter D of balls (8) is 0.8(E/D) 0.94. The wheel bearing device makes it possible to suppress an increase in weight while suppressing generation of abnormal sounds.

A hub-bearing unit having an axis of rotation includes a radially outer ring configured to be stationary, a flanged hub inside the radially outer ring configured to rotate relative to the axis and relative to the radially outer ring, a radially inner ring mounted on the flanged hub in axial abutment with a shoulder of the flanged hub, a front toothing configured to receive a driving torque from a joint, and a retainer configured to receive and form a snap fit seal with an elastic ring connected to the joint, the retainer being located on a radially external cylindrical surface of the radially inner ring and comprising a shaped metal insert and an elastomeric element vulcanized onto the metal insert.

Systems are provided for an electric drive axle, and more specifically, systems are provided for a wheel end assembly. In one example, a wheel end assembly includes a constant velocity (CV) shaft splined with a CV joint that extends through a hub and a bearing in face-sharing contact with each of a CV joint shoulder and a hub shoulder.