Recirculating ball power steering system

A power steering system for transferring torque to a pitman arm, comprising:

• a sector gear operatively connected to the pitman arm for torque transfer therewith;
• a first ball screw;
• 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.

A power steering system for transferring torque to a pitman arm, comprising:

• a sector gear operatively connected to the pitman arm for torque transfer therewith;
• a first ball screw;
• 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;
• a first electric motor configured to selectively supply torque to the sector gear;
• and
• a second electric motor configured to selectively supply torque to the sector gear.