Patent ID: 8360197
Filing Date: 2013-01-29
Classification: B62D

Abstract:
1. A power steering system for transferring torque between an input member and a pitman arm, comprising: an input shaft operatively connected to the input member; a sector gear operatively connected to the pitman arm for torque transfer therewith; a first ball screw, wherein the first ball screw is formed on the input shaft; a first ball nut circumscribing the first ball screw and in torque-transfer communication with the first ball screw through a plurality of ball bearings; a first rack rigidly attached to the first ball nut, wherein the first rack is meshed with the sector gear for torque transfer therewith; a second ball screw, wherein the second ball screw is not substantially coaxial with the first ball screw; a second ball nut circumscribing the second ball screw and in torque-transfer communication with the second ball screw through the plurality of ball bearings; a second rack meshed with the sector gear for torque transfer therewith; and an electric motor configured to selectively supply torque to the sector gear through the second ball screw.