Patent ID: 7678004
Filing Date: 2010-03-16
Classification: B62D

Abstract:
1. A steering apparatus comprising: a rotation transmitting apparatus for transmitting an operation of a steering wheel of a vehicle to a steering mechanism, the transmitting apparatus including: a differential mechanism having a first shaft and a second shaft arranged so as to be freely rotatable and linked with each other so as to rotate interlockingly, the first shaft being at a steering wheel side, and the second shaft being at a steering mechanism side; and a first electric motor for driving a part of the differential mechanism, wherein the differential mechanism is arranged to have a torque ratio (T wherein the differential mechanism includes a first sun gear joined to the first shaft so as to rotate interlockingly, a second sun gear joined to the second shaft so as to rotate interlockingly, a first planetary gear meshed with the first sun gear, a second planetary gear rotating with the first planetary gear and meshed with the second sun gear, and a carrier supporting the first and second planetary gears and arranged to be driven by the first electric motor, wherein the number of teeth of each of the first and second sun gears and the first and second planetary gears is determined so as to satisfy the torque ratio.