Provided is a torque-transmission joint 15a that is able to reduce the thrust force that is transmitted between the output shaft 12a of an electric motor 8 and a worm shaft 6a without generating noise. A shock-absorbing member 18a that is made using an elastic material is assembled between a driving-side transmission member 16a that is supported by the output shaft 12a and a driven-side member 17a that is supported by the worm shaft 6a. Held sections 33a, 33b of the shock-absorbing member 18a are located between the side surfaces in the circumferential direction of driving-side arm sections 21a of the driving-side transmission member 16a and side surfaces in the circumferential direction of driven-side arm sections 23a of the driven-side transmission member 17a. A damper section 26 is integrally provided with the shock-absorbing member 18a, and that damper section 26 is elastically held between the tip-end surface of the output shaft 12a and the base-end surface of the worm shaft 16a.

An electric power steering device includes a restricting portion that is provided on at least one of surfaces of a housing and a worm wheel, the surfaces facing each other. The restricting portion is configured to restrict movement of the worm wheel to maintain a meshing relationship between a worm and the worm wheel that allows torque transmission between the worm and the worm wheel, when fixing of the worm wheel to an output shaft of a power assist actuator in an axial direction of the output shaft is released and the worm wheel is moved in the axial direction.

One embodiment provides a power steering apparatus including: a worm gear that is rotated by receiving a driving force; a bearing member that supports the worm gear so as to make the worm gear rotatable; a worm wheel that is connected to the worm gear so as to be rotatable and apply a steering assist force to a steering wheel; and a support member that supports the bearing member so as to make the bearing member slidable in a crossing direction that crosses a rotating shaft of the worm wheel. The support member has a guide surface to guide the bearing member in the crossing direction therealong. The support member also has a holding portion that holds a lubricant in a recessed portion that is recessed from the guide surface.

The embodiments of the present disclosure relate to a steering apparatus and an assembly method thereof, may provide a steering apparatus and an assembly method thereof capable of reducing the fluctuation range of torque ripple in using a double motor and double reducer structure, thereby relieving a fatigue and discomfort of a driver.

A recirculating ball power steering system includes an electric motor. The system also includes a ball screw rotatably driven by the electric motor. The system further includes a ball nut translatable along the ball screw in a linear direction during rotation of the ball screw. The system yet further includes a sliding joint in sliding contact with an outer surface of the ball nut, the sliding joint moveable in a non-parallel direction relative to the linear direction of the ball nut.

A method for controlling an electric power steering apparatus, the electric power steering apparatus and a vehicle equipped with the same. The method includes detecting an upper-side angle of a torsion bar; detecting a lower-side angle; setting an angle target value of an opposite side by using one of the upper-side angle or the lower-side angle; detecting an actual angle of the opposite side; and performing an angle follow-up feedback control based on a deviation between the angle target value and the actual angle.

A shock-absorbing member comprises held sections located at a plurality of locations in a circumferential direction and comprising paired held sections and non-paired held sections, and is constructed to have a non-circular cylindrical shape in cross-section. Portions where outer-diameter side end sections of held sections that are adjacent to each other in the circumferential direction are made continuous by way of outer-diameter side cover sections, and portions where inner-diameter side end sections of held sections that are adjacent to each other in the circumferential direction are made continuous directly or by way of inner-diameter side cover sections, in an alternating sequence in the circumferential direction. Drive-side arm sections are placed between the non-paired held sections, driven-side arm sections are placed between the paired held sections, and the outer circumferential surfaces of the drive-side arm sections are covered by the outer-diameter side cover sections.

A method is disclosed for preparing a steering gear for subsequent use as part of a steering system of a motor vehicle, the steering gear includes at least a gear and a pinion meshing with the gear, and at least the teeth of the gear and/or of the pinion being made of plastic. The pinion is first pressed against the gear by way of a first force, while at the same time the pinion and the gear are rotated first in a first direction of rotation and subsequently in the second direction of rotation. The first force is preferably selected so high that plastic deformation of the plastic of the pinion and/or of the gear is achieved. Subsequently, the pinion is pressed against the gear by way of a second, defined force, which is less than the first force, the second force being permanently set.

A reducer of a power steering apparatus for vehicle. The formability and precision of a worm wheel is improved. The mechanical strength and durability of the worm wheel is increased so the reducer can be stably driven for a long time when a high power is transmitted from a worm shaft to a steering shaft through the worm wheel.

A recirculating-ball steering system for transmitting a steering movement to a steering arm, includes: a housing having a steering piston arranged inside the housing, wherein the steering piston includes a ball screw drive and is displaceable along its longitudinal axis, and an electrical actuator for assisting the movement of the steering piston. Also described is a vehicle having the recirculating-ball steering system.