Wheel bearing assembly

A wheel bearing assembly comprising:

• a wheel hub having a hub flange on which a wheel is mounted;
• one or more inner rings configured to be press-fitted and mounted to one side of the wheel hub;
• an outer ring provided radially outward of the one or more inner rings and having a mounting flange, which is formed on an outer peripheral surface of the outer ring and on which a vehicle body is mounted;
• and
• one or more rolling elements provided between the one or more inner rings and the outer ring,
• wherein the one or more inner rings are 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,
• wherein a plurality of recesses for accommodating rotating elements of a constant velocity joint are 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,
• wherein a heat-treated hardened portion is formed on the inner peripheral surface of the vehicle-body-side end portion of the wheel hub,
• wherein the heat-treated hardened portion is formed to include at least a region with which the rotating elements of the constant velocity joint are brought into contact,
• wherein a vehicle-body-side end portion of an inner ring disposed on a vehicle-body-side in the one or more inner rings is positioned spaced apart from a vehicle-body-side axial end portion of the heat-treated hardened portion to the vehicle-body-side,
• wherein a distance A between the vehicle-body-side end portion of the inner ring disposed on the vehicle-body-side in the one or more inner rings and the vehicle-body-side axial end portion of the heat-treated hardened portion is formed to be equal to or greater than 2 mm,
• wherein the one or more inner rings comprise a first inner ring for supporting first rolling elements and a second inner ring for supporting second rolling elements,
• wherein the first inner ring and the second inner ring are mounted on the wheel hub such that a pitch circle diameter of the first rolling elements is larger than a pitch circle diameter of the second rolling elements, and
• wherein a pre-load transmission member is provided between the first inner ring and the second inner ring, one surface of the pre-load transmission member being in contact with the first inner ring and the other surface of the preload transmission member being in contact with the second inner ring.