Patent ID: 7717203
Filing Date: 2010-05-18
Classification: B60K,F16H,Y10S

Abstract:
1. A wheel rotating apparatus for rotating a wheel, having a rim and a predetermined inner space defined by a circumference face of the rim, to generate a driving force, comprising: a base to be supported by a body; a motor, in the inner space, including: a stator fixed to the base: a rotor facing the stator along the circumferential direction of the wheel, the stator and the rotor being housed along the rim inside the rim in a radial direction of the wheel; and a motor output shaft inside the stator and the rotor in the radial direction for generating a rotation force at the motor output shaft; a planet gear unit in the inner space, disposed inside the rotor and the stator in the radial direction, including: a sun gear coupled to the motor output shaft; a planet gear; an inner gear coupled to the sun gear through the planet gear; and a planet gear unit output member; a wheel rotating member connected to the planet gear unit output member; a rotatably supporting member connected to the base for rotatably supporting the wheel rotating member and the sun gear from the base, the wheel being to be connected to the wheel rotating member, wherein the planet gear includes a first gear having a first diameter and a second gear, having a second diameter different from the first diameter, connected to the first gear in an axial direction thereof to have a unit body, the first gear is in an inside space defined by circumferential faces of the stator and the rotor and in mesh with the sun gear, and the second gear is outside the first gear in the axial direction relative to the body and in mesh with the inner gear.