A helical gear transmission for an electromechanical servo steering mechanism may include a shaft that meshes with a helical gear. The shaft may be arranged in a transmission housing and, at its first end, may be mounted in a drive-side bearing arrangement so as to be rotatable about an axis of rotation. At its second end, the shaft may be mounted in a drive-remote bearing arrangement in the transmission housing. The drive-side bearing arrangement may have a rolling bearing, an outer ring of which is spherical. The rolling bearing may be enclosed by two bearing shells. The outer side of the outer ring may have two flat points that are opposite one another and form a pivot axis about which the shaft is pivotable in a direction of the helical gear.

A helical-gear transmission for an electromechanical power steering includes a shaft intermeshing with a helical gear. The shaft is arranged in a transmission housing and is rotatably mounted in the transmission housing about a longitudinal axis, having the first end thereof in a drive-side bearing arrangement and the second end thereof in a non-drive-side bearing arrangement. The transmission housing has, in extension of the shaft on a non-drive-side end, an opening which can be sealed by a cover, wherein the cover has a cover base and a surrounding cover edge, wherein the cover base has, in the region of the shaft, a bulge extending to the outside in the direction of the shaft which forms an axial lock of the shaft.

Steering actuators for vehicles are described herein. An example actuator includes a rack to be coupled to a knuckle of a vehicle, a ball nut coupled to the rack, a ring gear coupled to the ball nut, and a motor with a pinion engaged with the ring gear. The motor is to rotate the ball nut, via the pinion and the ring gear, to move the rack linearly.

A steering control device includes an electronic control unit. The electronic control unit is configured to detect an absolute steering angle, to calculate a current command value, to control driving of a motor such that an actual current value which is supplied to the motor reaches the current command value, to store an end-position-corresponding angle which is correlated with the absolute steering angle, to perform end contact relaxation control for correcting the current command value such that a decrease of an end separation angle is regulated when the end separation angle is equal to or less than a predetermined angle, and to calculate the current command value such that an increase of the end separation angle is not regulated by the end contact relaxation control when the end separation angle is equal to or less than the predetermined angle.

A noise reduction structure of an electronic power steering apparatus including a worm shaft rotated by a motor, a worm wheel engaged in the worm shaft and rotating a steering shaft, and a housing surrounding the worm shaft includes a cylindrical damper unit formed as an elastic member in an inner side of the cylindrical damper unit for absorbing a shock transmitted to the worm shaft and rotatably connected to the worm shaft, a rubber holder coupled to a semi-cylindrical damper holder formed on a side surface of the damper unit for making a close contact between the worm shaft and the worm wheel, and a plug unit including a plug holder formed on a lower end of a side surface of the plug unit for coupling to the rubber holder and fixed to the housing on the other side of the plug unit.

A power actuator assembly for a steering column assembly is provided. The power actuator assembly include an electric motor. Also included is a leadscrew. Further included is a gear arrangement operatively coupled to the electric motor, the gear arrangement driving rotation of the leadscrew. Yet further included is a nut threaded to the leadscrew, rotation of the leadscrew actuating linear motion of the nut relative to the leadscrew, the nut operatively coupled to a moveable portion of the steering column assembly to actuate motion of the moveable portion. Also included is a leadscrew housing, the leadscrew extending axially through the leadscrew housing. Further included is a helical bushing disposed between a radially inner surface of the leadscrew housing and a radially outer surface of the leadscrew.

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.

A motor driven power steering device including a motor and a speed reducer configured to decelerate a rotation speed of the motor, wherein the speed reducer includes a worm gear coupled to a drive shaft of the motor and rotatably installed to a speed reducer housing through a bearing, a worm wheel gear-coupled with the worm gear, and a rotation member mounted between the worm gear and the bearing and configured to circulate a lubrication agent applied between the worm gear and the worm wheel.

To provide a gear housing comprising a front housing having a structure which can make the front housing lightweight and which can increase the strength of a continuous section of a worm wheel housing portion and a support portion where stress tends to be concentrated. A front-side housing is made of synthetic resin, and includes a housing front plate portion which constitutes a worm wheel housing portion and a support portion integrated with the housing front plate portion. A reinforcing member made of a metal plate is provided at a corner portion between a front surface of the housing front plate portion and a lower surface of the support portion.

A worm gear for a worm gear mechanism of a motor vehicle steering system includes a carrier body and a multiplicity of teeth with tooth surfaces. The teeth point radially outward and the carrier body is formed from a plastic including reinforcement fibers and has a multiplicity of ribs with rib surfaces which point radially outward from a central encircling ring-shaped web of the worm gear. The teeth are applied to the ribs of the carrier body by injection molding, and the reinforcement fibers are oriented, wherein the multiplicity of reinforcement fibers, in terms of their orientation, follow the adjacent rib surfaces of the carrier body and/or the adjacent tooth surfaces of the teeth.