A spindle drive (20) for an actuator of a steer-by-wire steering system (10). The spindle drive has a linearly displaceable threaded spindle (27). The spindle drive (20) is in the form of a roller screw drive. The roller screw drive has a firs efficiency in the driving direction and a second different efficiency in the reverse-driving direction.

A steering actuator for rear axle steering of a motor vehicle has a spindle drive (5) which comprises pushrods (9) which are connected to a threaded spindle (16) and which are mounted in a housing (6) by means of plain bearings (18), allowing the passage of air, and are connected at each end thereof to an attachment element (12) provided for coupling to a chassis suspension arm, wherein a gaiter (19, 20) is connected on the one side to the housing (6) and on the other side to one of the attachment elements (12) in each case. Each plain bearing (18) is designed as a bearing allowing one revolution of the threaded spindle (16), wherein at least one longitudinal groove (21) abuts one guide bush (23) of the plain bearing (18).

Planetary roller screw having a threaded spindle, and having a nut element arranged on the threaded spindle, and having planets arranged distributed around the periphery of the threaded spindle, which mesh on one side with the threaded spindle and on the other side with the nut element, which is rotatably mounted in both axial directions in each case by means of a first bearing on a rotationally driven planet carrier which receives the planets and is rotatably mounted on a housing by means of a second bearing. The planet carrier has a sleeve encompassing the nut element, at the axial ends of which a flange respectively having a first bearing seat of the first bearing and a second bearing seat of the second bearing is arranged, the flanges being connected with play to one another by means of the sleeve in a rotationally fixed manner and axially with actuating play.

A steering actuator comprising a shaft having an input coaxial with an output, wherein the output is in drivable communication with one or more wheels of a vehicle, and a locking mechanism configured to enable the shaft to rotate in both a first direction and a second direction in response to torque provided at the input, and prevent the shaft from rotating in both the first direction and the second direction in response to torque provided at the output.

Disclosed is an electric vehicle, comprising a chassis (1), a vehicle body and a power battery (71), wherein the chassis (1) comprises a frame system (2), a steering motor damping system (13) mounted on the frame system (2), a wheel system (12) connected to the steering motor damping system (13), a steering system (3) mounted on the frame system (2), and a braking system (4) mounted on the frame system (2); and the wheel system (12) comprises a left front wheel (121) using a hub motor, a left rear wheel (123) using a hub motor, a right front wheel (122) using a hub motor, and a right rear wheel (124) using a hub motor. Driving the wheels (121, 122, 123, 124) with the hub motors can omit a traditional mechanical transmission system, so as to simplify the structure of the chassis (1) and reduce the weight of the chassis (1). Compared with a traditional electric vehicle, the electrical vehicle has a lighter weight, smaller volume, reduced mechanical transmission loss, and improved electrical energy utilization rate.

A power assistance drive for a steering column of a motor vehicle may include a belt drive arranged in a housing, with an input pulley that is coupled to the motor shaft of a motor so as to be rotationally drivable about an input axis and which is drivingly connected by means of a drive belt to an output pulley that is mounted in the housing so as to be rotatable about an output axis. To enable a repair-friendly design and easier replacement of the motor, the motor may be releasably attached to the housing and the motor shaft may be connected to the input pulley by means of a releasable coupling.

An actuator for rear-axle steering system of a motor vehicle comprises a threaded spindle (2) which is surrounded by planets (21), each provided with a corresponding profiling (8), wherein the planets (21) are guided in a driven cage (13) and, via further profiling (25), contact a nut (4) that surrounds areas of the planets (21) provided with said profiling (8) and is supported with respect to the cage (13) by rolling bearings (14), and wherein the cage (13) is mounted in a housing (20) by means of further rolling bearings (30, 31, 32, 33) and is non-rotatably connected to an output-side component (12, 34) of a further transmission (10, 11, 12).

Disclosed is an electric vehicle, comprising a chassis (1), a vehicle body and a power battery (71), wherein the chassis (1) comprises a frame system (2), a steering motor damping system (13) mounted on the frame system (2), a wheel system (12) connected to the steering motor damping system (13), a steering system (3) mounted on the frame system (2), and a braking system (4) mounted on the frame system (2); and the wheel system (12) comprises a left front wheel (121) using a hub motor, a left rear wheel (123) using a hub motor, a right front wheel (122) using a hub motor, and a right rear wheel (124) using a hub motor. Driving the wheels (121, 122, 123, 124) with the hub motors can omit a traditional mechanical transmission system, so as to simplify the structure of the chassis (1) and reduce the weight of the chassis (1). Compared with a traditional electric vehicle, the electrical vehicle has a lighter weight, smaller volume, reduced mechanical transmission loss, and improved electrical energy utilization rate.

A method is disclosed for setting an axial preload force of a roller screw drive rotatably mounted in a housing. The housing is split transversely into a first and a second housing part. The roller screw drive is inserted with two axially spaced bearings into the second housing part. An axial preload force is applied which is transmitted from the first bearing via the roller screw drive to the second bearing. An axial load spacing between the bearing supporting surface of the first bearing and a second housing edge of the second housing part is measured. An adjusting nut is screwed into the first housing part until an axial adjustable spacing is the same size as the measured axial load spacing. The adjusting nut is then secured in place in the first housing part, and the two housing parts are connected to one another.

A steering assembly for a vehicle including a housing and a shaft assembly supported in the housing. The shaft assembly includes a spindle and an anti-rotation component coupled to the spindle. The anti-rotation component restricts rotation of the spindle while permitting translation of the spindle relative to the housing. The spindle and the anti-rotation component are coupled together with a tolerance ring. The spindle can have a circular cross-sectional profile portion adapted to be received in a circular opening of the anti-rotation component. The tolerance ring can be interposed between the circular cross-sectional profile portion of the spindle and the anti-rotation component.