The present disclosure relates to a rear-wheel steering system and a controlling method thereof. The rear-wheel steering system includes: a rack configured to transmit a driving force generated from a rear-wheel steering motor to rear wheels; a first correction module configured to, when an engine is started, detect a position of the rack using a displacement sensor and calculate a first correction value that is a difference between the detected position and a neutral position; a second correction module configured to, when the engine is started, detect a position of the rack using a motor position sensor that detects a rotation angle of the rear-wheel steering motor and calculate a second correction value that is a difference between the detected position and the neutral position; a comparison determiner configured to compare the first correction value and the second correction value to determine whether the displacement sensor has malfunctioned; and a steering controller configured to control an operation of the rear-wheel steering motor. Accordingly, it is possible to determine whether an error occurs in the displacement sensor and to return the rack to the neutral position even when the error has occurred in the displacement sensor.

A rear wheel steering apparatus may include: a driving part housed in a housing part; a rotating part rotated by the driving part; a moving shaft part connected to tie rods, and screwed to the rotating part; a spline plate spline-coupled to the moving shaft part so as to restrict rotation of the moving shaft part; and a space maintaining part protruding from the moving shaft part or the spline plate, and maintaining a space between the moving shaft part and the spline plate.

An electrically operable axle drive train for a motor vehicle, comprising a first vehicle axle having a first electric machine configured to drive a first vehicle wheel of the first vehicle axle, a second electric machine configured to drive a second vehicle wheel of the first vehicle axle, a steering system configured to steer the motor vehicle, and a control unit designed to actuate the steering system. In response to a malfunction of one of the electric machines in which at least one of a lower speed and a lower torque is applied to one of the vehicle wheels than to the other vehicle wheel, the control unit actuates the steering system to a steering position that counteracts a resulting torque that acts on the motor vehicle in response to the malfunction.

A method for controlling an actuator for steering a wheel of a motor vehicle including an electrical actuator controlling steering angle of the steering wheel and a mechanism determining temperature of the actuator. The method includes: completing deactivating the actuator; and a counter-steering operation triggered when the temperature of the actuator is higher than or equal to a determined prevention threshold.

It is an object of the present invention to provide a rear wheel steering device of which the weight is not added to unsprung weight, and which can steer right and left rear wheels independently of each other. The rear wheel steering device includes a first rod connected to the left rear wheel, a first driving portion configured to axially move the first rod, a second rod connected to the right rear wheel, and a second driving portion configured to axially move the second rod. A single housing supports the first rod, the first driving portion, the second rod, and the second driving portion.

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.

The present invention relates to an assembly which includes: a chassis for a mobile land vehicle, in particular an agricultural or public works vehicle; at least two half-crossmembers (21) mounted telescopically on the chassis; wheel mountings (27) pivotably mounted on each one of said half-crossmembers; steered wheels rotatably mounted on said mountings; and a device for controlling the direction of the wheels. The assembly is characterized in that it includes means (39, 41, 47) designed, for a certain position of two half-crossmembers, to increase, upon the pivoting of the wheels, the opening of the said wheels relative to the opening of the wheels resulting from the same pivoting and another position of the two half-crossmembers.

A steering apparatus for an automobile according to the exemplary embodiment of the present invention includes: a steering housing in which a steering drive unit, which moves a left tie rod and a right tie rod to the left and right sides, is disposed; a left mounting bracket which is coupled to a left side of the steering housing and coupled to a left lower arm; and a right mounting bracket which is coupled to a right side of the steering housing and coupled to a right lower arm.

A omnidirectional vehicle includes a chassis, wheels and wheel steering mechanisms. The wheel steering mechanisms are configured between the chassis and the wheels, and are arranged to drive the wheels to rotate about a steering center shaft of each wheel with 180 or more. The omnidirectional vehicle can achieve longitudinal driving and lateral driving, or other driving manners.

A vehicle (10) comprising: a rear axle mounted axial drive steering gear (12) positioned forward of a rear wheel centre axis (16); and a rear axle mounted active roll control unit (14) positioned forward of the rear wheel centre axis (16).