Patent ID: 7556580
Filing Date: 2009-07-07
Classification: B60K,B60L,F16C,H02K,Y02T

Abstract:
1. A motor-driven wheel driving apparatus comprising: a wheel bearing, a planetary reduction gear, a driving section having an electric motor for driving the planetary reduction gear and a rotation member; the wheel bearing including a wheel hub formed with a wheel mounting flange on one end, an inner ring press-fit on a cylindrical portion of the wheel hub, said inner ring formed with at least one double row inner raceway surfaces on an outer circumferential surface, an outer member formed with double row outer raceway surfaces on an inner circumferential surface opposite to the inner raceway surfaces, and double row rolling elements rollably arranged between the inner and outer raceway surfaces; the planetary reduction gear including an input element mounted on the rotation member, a stationary element mounted on the inner circumferential surface of the outer member, a plurality of planetary elements arranged between the stationary element and the input element, and an output element for rotatably supporting the planetary elements relative to a connecting shaft; the driving section forming the electric motor including a stator housing mounted on the outer member, a stator portion contained within the stator housing, and a rotor portion secured on the rotation member and arranged oppositely to the stator portion via a predetermined air gap; the connecting shaft removably and torque-transmittably connected to the wheel hub, said connecting shaft adapted to drive a wheel by transmitting the rotation of the electric motor to the wheel hub via the planetary reduction gear; a braking apparatus is directly associated with the rotation member for terminating rotation of said rotation member.