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.

A steering gear system (20) for a steer-by-wire steering device of a motor vehicle. The steering gear system having a housing (22), a spindle (24) and a rotatably mounted spindle nut (5), which is located within the housing (22), and a spindle drive (23) for the axial displacement of the spindle (24) relative to the spindle nut (25). The steering gear system further having a spindle nut (25) which, by way of at least one energy store (40), is supported at least indirectly relative to the housing (22) in the rotational direction about a longitudinal axis (a) of the spindle nut (25), so that the spindle nut (25) can be kept in a zero position or in a range around the zero position and/or turned back to the zero position.

A steering gear system (20) for a steer-by-wire steering device of a motor vehicle. The steering gear system having a housing (22), a spindle (24) and a rotatably mounted spindle nut (5), which is located within the housing (22), and a spindle drive (23) for the axial displacement of the spindle (24) relative to the spindle nut (25). The steering gear system further having a spindle nut (25) which, by way of at least one energy store (40), is supported at least indirectly relative to the housing (22) in the rotational direction about a longitudinal axis (a) of the spindle nut (25), so that the spindle nut (25) can be kept in a zero position or in a range around the zero position and/or turned back to the zero position.

A steering system with an actuating device (1), in particular a rear axle steering system, having a spindle drive (3) with a spindle (5) and a spindle nut (4) which is fitted into the housing (2) of the steering system in a positionally fixed but rotatable manner and is driven by an electric motor (9). The electric motor (9) is a vernier motor that drives the spindle drive (3) and is integrated in the spindle drive (3). The actuating device (1) is used for a rear axle steering system of a motor vehicle.

A steering system with an actuating device (1), in particular a rear axle steering system, having a spindle drive (3) with a spindle (5) and a spindle nut (4) which is fitted into the housing (2) of the steering system in a positionally fixed but rotatable manner and is driven by an electric motor (9). The electric motor (9) is a vernier motor that drives the spindle drive (3) and is integrated in the spindle drive (3). The actuating device (1) is used for a rear axle steering system of a motor vehicle.

A lead screw structure comprises a screw shaft having a thread on an outer circumferential surface thereof, a nut unit coupled to the screw shaft such that and a thread formed on an inner circumferential surface of the nut unit is engaged with the thread of the screw shaft, and a first elastic member disposed on a portion of the nut portion, in a direction of the screw shaft, to provide an elastic force to the nut portion in the screw shaft, thereby compensating for a gap between the thread of the outer circumferential surface of the screw shaft and the thread of the inner circumferential surface of the nut unit.

A lead screw structure comprises a screw shaft having a thread on an outer circumferential surface thereof, a nut unit coupled to the screw shaft such that and a thread formed on an inner circumferential surface of the nut unit is engaged with the thread of the screw shaft, and a first elastic member disposed on a portion of the nut portion, in a direction of the screw shaft, to provide an elastic force to the nut portion in the screw shaft, thereby compensating for a gap between the thread of the outer circumferential surface of the screw shaft and the thread of the inner circumferential surface of the nut unit.

A steering column for vehicle according to an embodiment of the present disclosure includes an upper column, a lower column, a pinion pulley, a guide roller, a telemotor, and a belt. A steering shaft is disposed in the upper column, and the rack bar is disposed on an outer surface of the upper column. The upper column is disposed in the lower column. The lower column includes an opening portion in which the rack bar is disposed, a first protruding portion formed at one side of an outer peripheral surface, and a second protruding portion formed at the other side of the outer peripheral surface. The pinion pulley is rotatably coupled to the first protruding portion, and the guide roller is rotatably coupled to the second protruding portion. The telemotor is fixedly coupled to an outer surface of the lower column. The belt connects the pinion pulley and the telemotor.

A steering column for vehicle according to an embodiment of the present disclosure includes an upper column, a lower column, a pinion pulley, a guide roller, a telemotor, and a belt. A steering shaft is disposed in the upper column, and the rack bar is disposed on an outer surface of the upper column. The upper column is disposed in the lower column. The lower column includes an opening portion in which the rack bar is disposed, a first protruding portion formed at one side of an outer peripheral surface, and a second protruding portion formed at the other side of the outer peripheral surface. The pinion pulley is rotatably coupled to the first protruding portion, and the guide roller is rotatably coupled to the second protruding portion. The telemotor is fixedly coupled to an outer surface of the lower column. The belt connects the pinion pulley and the telemotor.

A steering gear system (20) for a steer-by-wire steering device of a motor vehicle. The steering gear system having a housing (22), a spindle (24) and a rotatably mounted spindle nut (5), which is located within the housing (22), and a spindle drive (23) for the axial displacement of the spindle (24) relative to the spindle nut (25). The steering gear system further having a spindle nut (25) which, by way of at least one energy store (40), is supported at least indirectly relative to the housing (22) in the rotational direction about a longitudinal axis (a) of the spindle nut (25), so that the spindle nut (25) can be kept in a zero position or in a range around the zero position and/or turned back to the zero position.