Connection of a flanged ring of a hub bearing unit to a motor vehicle wheel or suspension standard of a motor vehicle

A hub-bearing assembly for a motor vehicle wheel, the assembly comprising:

• a flanged ring defining a central axis of rotation, with
• a tubular core made of a first high toughness metallic material, and
• a flange extending in a radially outer direction, wherein the flange is made of a second material lighter than the first material, is integral with the core, and provides a plurality of axial through bores at angularly equally spaced positions around the axis;
• a corresponding plurality of pin connection elements, each pin connection element having:
• an axially extending cylindrical shank portion, which defines a respective longitudinal axis parallel to the rotation axis and is at least partially accommodated in one of the bores,
• a head portion,
• a cylindrical threaded surface for connecting the flanged ring to a wheel or a suspension standard of a motor vehicle, and
• an axial through bore, coaxially inside the respective shank portion, in which bore the respective cylindrical threaded surface is formed;
• the hub bearing assembly being characterized in that said head portions each have a shape different from that of a solid of revolution generated about the longitudinal axis of the relevant shank portion, and in that each head portion is accommodated in a correspondingly shaped respective recess formed in one of the two radial opposite faces of the flange, and wherein each recess embraces the area where a respective one of the through bores opens onto the radial face of the flange.