An electromechanical power steering system may include an electric motor with a motor shaft that drives a shaft that meshes with a helical gearwheel. The shaft may be disposed in a gear housing, and a first end of the shaft may be mounted in a bearing arrangement such that the shaft is rotatable about an axis of rotation. A second end of the shaft may be mounted in a floating bearing in the gear housing. The floating bearing may be enclosed by a compensation device having an inner ring that on two radially opposite sides includes a respective nose formed from an elastomer. The compensation device may also include an outer ring that encloses the inner ring circumferentially. The outer ring may have lugs for receiving the noses. In an unloaded state, a gap may exist between the inner ring and the outer ring outside a region of the noses.

A turning device includes a turning shaft having a first ball screw groove as one of a left screw and a right screw and a second ball screw groove as the other of the left screw and the right screw and turning wheels to be turned by moving in an axial direction, a first electric motor generating a first driving force, a second electric motor operating independently of the first electric motor and generating a second driving force, a first ball screw nut transmitting the first driving force generated by the first electric motor to the first ball screw groove, a second ball screw nut transmitting the second driving force generated by the second electric motor to the second ball screw groove, and a rotation regulating part regulating relative rotation of the turning shaft around an axis with respect to a housing.

A worm shaft for a steering assembly includes a first end. The worm shaft also includes a second end located opposite the first end. The worm shaft further includes a middle portion between the first end and the second end, the middle portion including a plurality of teeth, each tooth of the plurality of teeth defining a pair of flank segments extending from a tooth base and meeting at a tip region, the pair of flank segments defining a non-continuously curving geometry within the tip region.

A gear housing for an electric power steering device has a front-side housing and a rear-side housing. The front-side housing has a worm wheel housing portion, a worm housing portion, and reinforcing ribs. The worm wheel housing portion has a worm wheel cylindrical portion and a ring shaped worm wheel bottom portion bent inward in a radial direction from a front end portion of the worm wheel cylindrical portion. The worm housing portion is provided on a part in a circumferential direction of an outer-diameter side portion of the worm wheel housing portion. The reinforcing ribs are provided on a front side surface of the front-side housing, extend in a direction in which an engagement reaction force acts between the worm wheel and a worm of the worm shaft, and span between the worm housing portion and the worm wheel bottom portion.

A worm wheel includes: a sleeve; and a toothed portion provided by injection molding so as to cover a part of the sleeve, the toothed portion including a first thick portion provided on a first side face, which is a surface of the sleeve on a side closer to an injection-mold gate in an axial direction, and a second thick portion provided on a second side face, which is a surface on an opposite side to the first side face. A central part, in the axial direction, of the outer peripheral surface of the sleeve projects in the radial direction relative to both ends in the axial direction. The first thick portion of the toothed portion has a smaller thickness in the axial direction than the second thick portion.

A holder member includes a holder-side holding surface for internally fitting and holding a rolling bearing on a tip end side and a holder-side held surface eccentric to a center axis of the holder-side holding surface. A guide member is internally fitted and held into a guide holding portion of a housing and includes a guide-side holding surface for internally fitting and holding the holder member to be capable of swinging about a center axis of the holder-side held surface. A first elastic urging member elastically urges a tip end portion of a worm toward a worm wheel side by elastically urging the holder member in a direction to rotate with respect to the guide member. Therefore, a structure which can more effectively suppress generation of gear rattle noise at a meshing portion between a wheel tooth and a worm tooth can be realized.

A worm gear for an electromechanical power steering system of a motor vehicle, includes a worm shaft that meshes with a worm wheel. The worm wheel and the worm shaft are arranged together in a gear housing. An eccentric lever and a bimetallic spring that is operatively connected to the eccentric lever are configured to compensate for a temperature-related play in the engagement between the worm wheel and the worm shaft.

A steer-by-wire steering system for a motorized vehicle includes a feedback actuator to simulate a steering feel to a steering device. The feedback actuator has an electric motor with a motor shaft connected to a driver input shaft to be able to transmit a torque. The motor shaft is able to be rotated in at least one rolling bearing. The rolling elements of the at least one rolling bearing are arranged in a magnetorheological fluid and the feedback actuator further includes an electromagnet to pass a magnetic field through said magnetorheological fluid for stiffening the fluid and restricting movement of the rolling element.

An apparatus for connecting an electric machine and a worm for an electric power steering system, including an electric machine, an electric machine shaft connected to the electric machine, and a worm. An end of the electric machine shaft is provided with a first mounting flange, and an end of the worm is provided with a second mounting flange. The apparatus includes at least one disk between the first mounting flange of the electric machine shaft and the second mounting flange of the worm. The apparatus for connecting an electric machine and a worm for an electric power steering system provided in the present invention is structurally simple, and at the same time transfers electric machine torque with high efficiency, and can effectively compensate for radial deviation and axial deviation between the electric machine shaft and a worm shaft.

An electromechanical power steering system may include an electric servomotor that has a motor shaft and drives a shaft that meshes with a helical gear. The shaft is disposed in a gearbox housing and rotatably mounted in a bearing assembly. A pretensioning installation, for adjusting engagement between the helical gear and the shaft, resiliently pretensions a movable bearing element of the bearing assembly relative to the gearbox housing. The gearbox housing has a housing portion having first and second contact faces, the normals of which do not intersect. The bearing assembly has a bearing support that forms the movable bearing element and has a lever arm having a free end that extends from a main body of the bearing support and on the gearbox housing lies against the second contact face. The main body has an eccentric cam that on the housing lies against the first contact face.