An electric power steering apparatus according to the embodiments of the present disclosure may comprise a ball screw having an outer screw groove formed on its outer circumferential surface, a ball nut having a gear portion formed on one side of the outer circumferential surface and an inner screw groove corresponding to the outer screw groove formed on the inner circumferential surface, coupled to the ball screw through a ball and sliding in the axial direction, a sector shaft having a shaft gear coupled to the gear portion of the ball nut on an outer circumferential surface and rotating when the ball nut slides in an axial direction, and a sliding support member coupled to the outer circumferential surface of the ball nut, supported on an inner circumferential surface of a housing, and axially slid together with the ball nut.

Techniques are described for managing redundant steering system for a vehicle. A method includes sending a first control command that instructs a first motor coupled to a steering wheel in a steering system to steer a vehicle, receiving, after sending the first control command, a speed of the vehicle, a yaw rate of the vehicle, and a steering position of the steering wheel, determining, based at least on the speed and the yaw rate, an expected range of steering angles that describes values within which the first motor is expected to steer the vehicle based on the first control command, and upon determining that the steering position of a steering wheel is outside the expected range of steering angles, sending a second control command that instructs a second motor coupled to the steering wheel in the steering system to steer the vehicle.

Provided are an electronic drive device and an electronic steering device, in each of which: a mounting substrate has one surface as a first surface on which a first heat generating component is mounted and the other surface as a second surface on which a second heat generating component is mounted; a first heat dissipation member is arranged in contact with the second surface at a position corresponding to a mounted position of the first heat generating component such that heat generated by the first heat generating component is dissipated to a motor housing; and a second heat dissipation member is arranged in contact with the first surface at a position corresponding to a mounted position of the second heat generating component such that heat generated by the second heat generating component is dissipated to a cover.

A gear is provided that has excellent continuous moldability for practical use, and both high slidability and high durability. The provided gear is a molded resin constructed of a resin composition comprising a thermoplastic resin (A) and cellulose nanofibers (B) with an average fiber diameter of 1000 nm or smaller, and having a number average molecular weight of the thermoplastic resin (A) in the range of 10,000 to 150,000, wherein a sliding surface of the gear with another gear teeth has an arithmetic mean surface roughness Sa of 3.0 μm or lower.

Disclosed herein is a structure for mounting an occupant protection system in a vehicle. The structure includes an electric power steering device (1) and a knee protection air bag assembly (51). The device (1) includes a steering column (18). The assembly (51) includes a bag (53) configured to expand to protect knees (9a) of an occupant (9) seated on a driver's seat (8) of the vehicle. The steering column (18) includes a drive member (26) of the device (1). The assembly (51) is located below the drive member (26).

A gearbox assembly for an electric power assisted steering apparatus includes a gearbox housing, a worm shaft, a main bearing assembly, and a first fulcrum means. The worm shaft may be supported relative to the housing by a main bearing assembly at an end closest to the motor. The main bearing assembly may include an inner ring defining an inner bearing race, an outer ring defining an outer bearing race, and a plurality of bearings that run between the two races. The first fulcrum means may be located on a first side of the main bearing assembly which reacts only the axial component of the wormshaft tooth load for a first direction of gearwheel torque. A second fulcrum means may be located on a second, opposing, side of the main bearing assembly, which reacts only the axial component of the wormshaft tooth load for the second direction of gearwheel torque.

A steering holding judging apparatus for the vehicle including: at least two steering angle sensors to detect a steering angle; and a steering state judging section to calculate a hysteresis central value by using a hysteresis signal that sets a hysteresis width to the two steering angle sensor, judge a steering state using the hysteresis central value, and output provisional steering information, wherein a steering holding state is detected based on the provisional steering information, and the electric power steering apparatus equipped with the steering holding judging apparatus for the vehicle.

A steering control device includes a control unit. The control unit is configured to execute a control angle calculation process, an angle feedback process, and a standard value adjustment process. The control angle calculation process is a process of calculating a control angle as an absolute angle relative to a standard value, and the angle feedback process is a process of performing feedback control on the control angle, and the standard value adjustment process is a process of adjusting the stored standard value. The standard value adjustment process includes a process of, when, in a straight-ahead state, the control angle deviates from a value showing the straight-ahead state, adjusting the standard value such that the deviation of the control angle from the value showing the straight-ahead state decreases.

A steering device includes: a housing including a first planar surface, the housing being configured to accommodate a part of a rack shaft; an electric motor including a second planar surface facing the first planar surface, the electric motor including a bracket configured to support a rotary shaft; a tightening member configured to tighten the housing and the bracket in a state where the first planar surface and the second planar surface are mated; and a sealing member configured to provide sealing between the housing and the bracket at a position that is closer to the rotary shaft than the tightening member is. At least one of the first planar surface and the second planar surface is formed with a recess located between the tightening member and the sealing member and depressed from the at least one of the first planar surface and the second planar surface.

A worm drive for a power steering system of a motor vehicle is disclosed. The worm drive includes a worm gear, a worm which meshes with the worm gear, and an electric motor which drives the worm. One side of the worm is connected by a coupling to the electric motor and the other side of the worm is mounted in a floating bearing. The coupling consists of a hub and an elastic spring bush. The floating bearing is oval-shaped in order to allow vertical movements of the worm, and the worm is spring-loaded on the worm gear by the coupling.