Patent ID: 9180905
Filing Date: 2015-11-10
Classification: B62D,F16H

Abstract:
1. An electric power steering apparatus for a vehicle, comprising: an electric motor supported on an inner peripheral surface of a housing, having a hollow shape, and including a motor shaft on which a sun gear is mounted on an outer peripheral surface of one end thereof; a planetary gear assembly which includes a first ring gear fitted in and fixed to the housing at a side of the motor, a second ring gear provided at a side of the first ring gear opposite to the motor, a plurality of planetary gears which are externally engaged with the sun gear while being internally engaged with the first and second ring gears respectively, and a carrier which both ends of a central shaft of the planetary gear is coupled to and supported on; and a pinion shaft extending through the motor shaft, and having one end thereof on an outer peripheral surface of which a pinion gear is mounted to be engaged with a rack gear formed on a rack bar, and the other end thereof which is connected to the input shaft by means of the torsion bar, the pinion shaft being connected to the second ring gear.