A method to manufacture electric power steering systems is proposed. First, an electric motor having a drive shaft, a coupling device, and a worm gear having a worm shaft are provided. Then, an adjusting sleeve is provided, and an individual axial position of each adjusting sleeve in its associated opening is determined in order to achieve a specific axial preloading force on the worm shaft. The adjusting sleeve is press-fitted into the axial opening in the determined axial position, and a spring element is installed in the adjusting sleeve so that the spring element is supported on one end axially on the drive shaft and on its other end it is supported axially on the adjusting sleeve, and said spring element acts upon the worm shaft with the preloading force in the axial direction via the adjusting sleeve.

A steering apparatus includes: a steering mechanism including a turning shaft; a motor configured to give a drive force to the steering mechanism; and a controller configured to control the motor based on a command value. The controller includes a first computation circuit, a second computation circuit and a third computation circuit. The first computation circuit is configured to compute a shaft force that acts on the turning shaft. The second computation circuit is configured to compute a value indicating the degree of intervention in a steering control by a host controller, such that the value gradually changes with respect to time. The third computation circuit is configured to compute a final shaft force, by reflecting the value indicating the degree of the intervention, in the shaft force.

A control device for a steer-by-wire type vehicle calculates a target turn angle being represented as a function of a steering angle of a steering wheel, and controls a turning device such that a turn angle of a wheel becomes the target turn angle. A variation range of the steering angle includes: an effective steering range in which the steering angle is an effective maximum steering angle or smaller; and an adjustment steering range in which the steering angle is between the effective maximum steering angle and a predetermined maximum steering angle. The target turn angle calculated according to the effective maximum steering angle is an effective maximum turn angle. The control device variably sets the function according to a road surface condition such that the effective maximum turn angle in a case of a low-μ condition is smaller than that in a case of a high-μ condition.

A sensor unit for a steering system, in particular a steer-by-wire steering system, includes a component to be monitored and having a multifunctional position sensor, which has at least one spring element and at least one piezoelectric sensor, which is associated with the spring element and is provided at a first end of the spring element. The spring element is associated with the component to be monitored via a second end opposite to the first end. A steering wheel subassembly, a rack subassembly and a steering system are furthermore described.

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 first efficiency in the driving direction and a second different efficiency in the reverse-driving direction.

A method for fixing a cover on an orifice of a power steering system including a step of approaching the cover to the orifice, characterized in that it includes a step of inserting at least one extension of the cover in at least one recess positioned next to the orifice and a step of deforming the at least one elongation of the cover.

A method for fixing a cover on an orifice of a power steering system including a step of approaching the cover to the orifice, characterized in that it includes a step of inserting at least one extension of the cover in at least one recess positioned next to the orifice and a step of deforming the at least one elongation of the cover.

A steering system for a vehicle includes a housing, an input shaft, and a hybrid shaft support. The housing defines an opening. The input shaft is configured to rotate about an input axis. The hybrid shaft support may be disposed at the opening and configured to couple the input shaft to the housing. The hybrid shaft support may also be configured to support the input shaft as the input shaft rotates. The hybrid shaft support further includes a cylindrical member and a flexible seal over-molded onto the cylindrical member.

A power assisted steering system provides a gear reduction between a steering wheel and a steering mechanism and a much larger gear reduction between an electric motor and a steering mechanism. The system is back-driveable from the steering mechanism. The system utilizes a ball-screw, several helical gears, and two bevel gears. A rack fixed to the ball-screw nut drives a sector gear.

Provided is a steering device including a lock nut that fixes an outer race of a turning nut threadably engaged with a rack bar. A loosening prevention protruding portion formed on a lock nut main body is brought into contact with a radial-direction abutting portion to prevent loosening of the lock nut with a frictional force. At the same time, a lock nut recessed portion for reducing mechanical stiffness is formed in an outer peripheral surface of the loosening prevention protruding portion so that an external force acting from the outer race is buffered by the lock nut recessed portion. In this manner, a decrease in contact area between the loosening prevention protruding portion and the radial-direction abutting portion is reduced.