Abstract: A steer-by wire apparatus for use in turning steerable vehicle wheels includes a steering member which is axially movable relative to the vehicle to effect turning movement of the steerable vehicle wheels. A ball nut assembly is connected with an externally threaded portion of the steering member. The steering member moves axially in response to rotation of the ball nut assembly relative to the steering member. A first motor connected with the ball nut assembly is operable to effect rotation of the ball nut assembly relative to the steering member. A pinion is in meshing engagement with the steering member. The steering member moves axially in response to rotation of the pinion. A second motor connected with the pinion is operable to effect rotation of the pinion relative to the steering member.

Abstract: An apparatus for use in turning steerable vehicle wheels includes a steering member which is axially movable relative to the vehicle to effect turning movement of the steerable vehicle wheels. A ball nut assembly is connected with an externally threaded portion of the steering member. A first motor connected with the ball nut assembly by a belt is operable to effect rotation of the ball nut assembly relative to the steering member. A second motor connected with the ball nut assembly and the first motor by the belt is operable to effect rotation of the ball nut assembly relative to the steering member.

Abstract: A steering apparatus is for turning steerable wheels of a vehicle. The steering apparatus includes a steering wheel rotatable about a steering axis to effect turning of the steerable vehicle wheels. A first shaft is connected to the steering wheel and rotatable about a first shaft axis. A first nut is threadably connected to and longitudinally movable along the first shaft. A second nut is connected to the first nut such that the first and second nuts are prevented from moving longitudinally relative to one another. A second shaft is rotatable about a second shaft axis. The second nut is threadably connected to and longitudinally movable along the second shaft. A motor is connected to the second shaft and controllable to apply a force to the steering wheel through the first and second shafts and the first and second nuts.

Abstract: An apparatus for use in turning steerable vehicle wheels includes a steering member which is axially movable relative to the vehicle to effect turning movement of the steerable vehicle wheels. A ball nut assembly is connected with an externally threaded portion of the steering member. A first motor is connected with the ball nut assembly. The first motor is operable to effect rotation of the ball nut assembly relative to the steering member. A second motor is connected with the ball nut assembly. The second motor is operable to effect rotation of the ball nut assembly relative to the steering member.

Abstract: An apparatus for use in turning at least one steerable vehicle wheel includes a steering member rotatably supported in a housing. The steering member rotates relative to the housing about a first axis to effect turning movement of the at least one steerable vehicle wheel. A ball nut is connected with an externally threaded portion of the steering member. The steering member is rotatable relative to the ball nut assembly to axially move the ball nut assembly relative to the housing. An electric motor is operable to apply a rotational force to the steering member to urge the steering member to rotate relative to the housing. The electric motor has an output shaft extending along a second axis extending generally parallel to the first axis. A first gear is rotatable about the second axis with the output shaft of the motor. A second gear in meshing engagement with the first gear is rotatable about a third axis extending transverse to the second axis.