A power assist device for supporting steering of a motor vehicle includes a steering column shaft and a housing. The shaft has a rotor and the housing has a stator. The stator is arranged in the radial direction with respect to the rotor. The rotor is a disk, and at least one magnet is arranged on the radially outer edge of said rotor.

A steering mechanism for simulating a haptic feedback steering sensation includes a steering shaft connected to a steering wheel. An angle measuring device is arranged on the steering shaft and measures a rotation angle that is prevailing at the steering wheel the steering mechanism further includes an electric motor arranged in a coaxial manner with respect to the steering shaft. The electric motor is configured to apply a torque to the steering shaft. The direction of rotation of the torque applied by the electric motor is usually oriented in the opposite direction to the direction of rotation of the rotation angle that is prevailing at the steering wheel. Furthermore, the magnitude of the torque is dependent upon the value of the rotation angle and upon the vehicle model that is used as a basis. The electric motor is connected to the steering shaft via a torsionally elastic coupling.

According to the present embodiments, a torque applied to a torsion bar is attenuated to thus relatively increase the rigidity of the torsion bar, thereby improving the response performance to a driver's steering wheel operation, increasing a responsive torque range, securing the durability of components such as the torsion bar, and simplifying adjustment of the moving distance of a rack bar compared to the number of revolutions of the steering wheel.

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.

An electric power steering system includes a system housing, an electric motor, a steering shaft assembly, and an electronic control unit. The electric motor is disposed within a motor housing that is disposed within and is attached to the system housing. The steering shaft assembly has a torsion bar that that extends at least partially through the system housing and motor housing. The electronic control unit a printed circuit board and a torque sensor. The printed circuit board is disposed within and is attached to the system housing. The torque sensor is disposed on the printed circuit board and is arranged to provide a signal indicative of angular displacement of the torsion bar.

A method of assembling an electric power steering assembly includes providing a shaft that extends along a longitudinal axis between a first shaft end and a second shaft end. The method further includes extruding or drawing the shaft through a die to define a spline that extends between the first shaft end and the second shaft end. The spline includes a first tooth having a first tip. The method still further includes applying a sleeve over a portion of the spline, such that the sleeve extends from the second shaft end towards the first shaft end.

In at least some implementations, a steering assembly includes a steering shaft rotatable in response to an input, and a rotation limiting gear set coupled to the steering shaft. The gear set includes a first movable stop surface that rotates with at least one gear of the gear set and the stop surface rotates at a lesser rate than the steering shaft and is arranged to engage a first fixed stop surface to limit rotation of the steering shaft.

An adaptive front steering system is capable of ensuring steering convenience and driving safety by changing a steering gear ratio in accordance with a driving situation of a vehicle. The adaptive front steering system is implemented as a new type of active front steering (AFS) system in which a hollow motor is applied to a steering column shaft, and a steering gear ratio is changed in accordance with a rotation direction and a rotation amount of a shaft of the hollow motor which is rotated together with an upper shaft.

A utility vehicle steering system has a steering gear for transmitting a manual torque that is applied to a steering wheel to a pitman arm. The steering gear has an electric motor for providing an auxiliary torque. The electric motor is arranged around a steering shaft. In addition, the electric motor has a stator with at least two electrically separated winding groups, each of which is controlled by a separate electronic control device. An especially compact utility vehicle steering system results, which enables the provision of large auxiliary torques by way of a single electric-motor drive while a limited installation space is achieved. The drive can be operated from a vehicle electrical system by a supply voltage of 24 V.

A vehicle steering device includes: a target-steered-angle setting unit configured to set a left target steered angle that is a target value of the steered angle of a left steered wheel and a right target steered angle that is a target value of the steered angle of a right steered wheel; left motor controllers configured to control a left steering motor based on a left-steered-angle deviation that is a difference between the left steered angle and the left target steered angle; right motor controllers configured to control a right steering motor based on a right-steered-angle deviation that is a difference between the right steered angle and the right target steered angle; and an abnormality determination unit configured to determine that an abnormality has occurred when an absolute value of difference between the left-steered-angle deviation and the right-steered-angle deviation is equal to or larger than a first threshold.