In a ball screw device, an inner peripheral rolling groove of a nut includes, between openings of mounting holes, a constant pitch circle diameter region where a pitch circle diameter is constant and gradually-changing pitch circle diameter regions where the pitch circle diameter gradually increases, in the ranges from opposite ends of the constant pitch circle diameter region to the respective openings. At least the constant pitch circle diameter region has a surface hardness greater than or equal to a predetermined value, among the constant pitch circle diameter region and the gradually-changing pitch circle diameter regions excluding edges at the boundaries between the respective openings and the inner peripheral rolling groove, and the edges at the boundaries between the respective openings and the inner peripheral rolling groove have a surface hardness less than the predetermined value.

A power system includes an electric motor for driving a left wheel and a right wheel of a vehicle, an electric motor control device for controlling the electric motor, a transmission disposed on a power transmission path between the electric motor, the left and right wheels, a differential device for distributing output decelerated by the transmission to the left and right wheels, a case which accommodates the electric motor, the transmission, and the differential device, a left axle of which one end is connected to the differential device and the other end extends from the case to be connected to the left wheel, and a right axle of which one end is connected to the differential device and the other end extends from the case to be connected to the right wheel. A conductive rotation allowing member having conductivity is provided between the differential device and the case.

A method is described for operating a steering system (2) of a motor vehicle. A steering means (8) is connected to a steering gear (14) by means of an active steering system (4). During autonomous operation of the motor vehicle, a driver's intervention (40) in the steering means (8) is determined. The active steering system (4) is operated in such a way that a coupling (30) between an angle (26) of the steering means and an angle (28) input into the steering gear (14) is adjusted depending on the thus determined driver's intervention (40).

According to one or more embodiments, a steer by wire steering system includes a handwheel actuator, a roadwheel actuator, and a resynchronization module to dynamically adjust handwheel position that is used for rack position reference calculation. The dynamic adjustment includes determining a desynchronization amount based on a difference in an actual handwheel position and a synchronized handwheel position. The dynamic adjustment further includes computing a handwheel adjustment using the desynchronization amount, a vehicle speed, and a handwheel speed. The dynamic adjustment further includes computing an adjusted handwheel position based on the handwheel adjustment and the actual handwheel position. The dynamic adjustment further includes updating the reference rack position based on the adjusted handwheel position. The dynamic adjustment is continuously repeated until the handwheel adjustment is substantially equal to zero.

The adjustment assembly of a hydraulic steering system of a vehicle is provided. The adjustment assembly can be positioned between the steering column and the hydraulic steering unit of the system, to adjust the mutual angular position between the rotation angle of the steering column () and the effective steering angle at the wheels ().The adjustment assembly includes an adjustment device including an electric motor and an electronic command unit controlling its actuation; an epicycloidal device including a satellite-carrying member operatively connected to the steering column; at least one satellite gear supported and guided in rotation by the satellite-carrying member; a first solar gear operatively connected to the hydraulic steering unit and to the at least one satellite gear; and a second solar gear operatively connected to the adjustment device and to the first solar gear to control the angular position and/or the rotation of the first solar gear.

A steering column for a motor vehicle includes a steering shaft, mounted rotatably about a longitudinal axis in a steering column housing, and a rotation limiter, and has a smooth and quiet construction of the rotation limiter. The rotation limiter includes two oppositely directed flat spiral springs, which are operatively arranged between a coupling part, disposed in a rotationally secure manner on the steering shaft, and the steering column housing.

The present invention relates to entering data into a trailer backup guidance system. In particular, the present invention relates to providing data by auto-configuration to systems for guiding a trailer while backing such as (i) the wheel base of the vehicle, (ii) the length of the trailer, (iii) the wheel base of the vehicle measured in units of trailer length, (iv) the ratio of the turning of the steering wheel to the turning of the wheels of the vehicle, and (v) a communication link's address or ID.

An emergency steering system for a vehicle, may include a planetary gear mounted in an inlet space of a gear box for a steering apparatus so that the planetary gear is ordinarily operated at a gear ratio of 1:1 and has an increased gear ratio in the event of failure of a main steering device; and a gear ratio increasing device mounted to an upper plate portion of the gear box to increase the gear ratio of the planetary gear.

A method for adapting an actual steering wheel angle of a steering wheel and an actual wheel steering angle of a wheel steering system in a motor vehicle after an automated driving maneuver has been executed. The method includes detecting the actual steering wheel angle by a steering wheel angle-detection device and the actual wheel steering angle by a wheel steering angle-detection device, adapting the actual steering wheel angle by a steering wheel-actuation device and/or the actual wheel steering angle by a wheel steering-actuation device based on a transfer strategy within a predefined transfer time. Also disclosed is an associated device.

A power system includes an electric motor for driving a left wheel and a right wheel of a vehicle, an electric motor control device for controlling the electric motor, a transmission disposed on a power transmission path between the electric motor, the left and right wheels, a differential device for distributing output decelerated by the transmission to the left and right wheels, a case which accommodates the electric motor, the transmission, and the differential device, a left axle of which one end is connected to the differential device and the other end extends from the case to be connected to the left wheel, and a right axle of which one end is connected to the differential device and the other end extends from the case to be connected to the right wheel. A conductive rotation allowing member having conductivity is provided between the differential device and the case.