WHEEL UNIT WITH DISENGAGEABLE DRIVE FOR AN ELECTRIC VEHICLE, HUB UNIT FOR THIS WHEEL UNIT, AND MOUNTING METHOD

A wheel unit for an electric vehicle with disengageable drive comprises a wheel support (4), a wheel hub (1) rotatably supported by the wheel support (4), and a wheel pin (5) carried by a member driven by the electric motor and rotatably mounted within the wheel hub (1), by means of two rolling bearings (19, 20). A coupling device (15) connects in a releasable way said driven member (6) to the wheel hub (1). The two rolling bearings (19, 20) that support in rotation the wheel pin (5) have respective outer rings (19A, 20A) mounted by interference fit within the cylindrical wall (7) of the central opening of the hub, and respective inner rings (19B, 20B) rigidly connected together by means of a spacer sleeve (21) having a rigorously predetermined length. The wheel-hub (1) unit (M) with the two rolling bearings (19, 20) and the spacer sleeve (21) can be assembled before being mounted on the wheel pin (5).