Bearing device for vehicle wheel and vehicle

A bearing device for a vehicle wheel comprising:

• a bearing for a vehicle wheel including an outer member, an inner member, and double-row rolling elements,
• the outer member including double-row outer raceway surfaces on an inner periphery,
• the inner member including a hub ring and at least one inner ring,
• the hub ring including a vehicle wheel mounting flange for mounting a vehicle wheel on one end portion in an axial direction, including a small-diameter step portion extending in the axial direction on an outer periphery, and including a through hole penetrating in the axial direction in an inner diameter portion,
• the at least one inner ring being press-fitted into the small-diameter step portion of the hub ring, the inner member including double-row inner raceway surfaces facing the double-row outer raceway surfaces,
• the double-row rolling elements being rollably accommodated between the outer raceway surfaces of the outer member and the inner raceway surfaces of the inner member;
• and
• a constant velocity universal joint including a fitting portion fittable to the through hole of the hub ring,
• wherein an inner peripheral surface of the through hole of the hub ring is formed with recesses extending along the axial direction,
• an outer peripheral surface of the fitting portion in the constant velocity universal joint is formed with protrusions extending along the axial direction and spline-fitted to the recesses,
• a ratio of an axial length C of the recesses to a pitch circle diameter A of the recesses satisfies 0.7≤(C/A)≤1.07,
• a ratio of an axial distance E between a flange surface of the vehicle wheel mounting flange and the other axial end surface of the inner ring to an inter-rolling element pitch F between a rolling element of the double-row rolling elements on one axial side and a rolling element of the double-row rolling elements on the other axial side in the double-row rolling elements satisfies 2.85≤(E/F), and
• a ratio of the axial distance E to a pitch circle diameter D of the double-row rolling elements satisfies 0.8≤(E/D)≤0.94.