A steering assembly for steering a vehicle in response to a steering input, the steering assembly includes an axle extending between a pair of wheels, a plurality of linkages, a primary electric drive source, and a secondary electric drive source. The plurality of linkages includes a pair of knuckles operatively coupled to the wheels, a tie rod extending between and coupled to the pair of knuckles, and a drag link attached to one of the knuckles. The primary electric drive source is operatively attached to the drag link, and moves the drag link in response to the steering input to transfer movement through the plurality of linkages to turn the wheels. The secondary electric drive source is operatively attached to one of the plurality of linkages to move the one of the plurality of linkages in response to the steering input and independently from the primary electric drive source.

The alignment of a nut and a nut-side pulley is performed by: a nut insertion step of inserting the nut into the nut-side pulley; a temporary tightening step of, after the nut insertion step, inserting a shaft portion of a fastening bolt in a fastening bolt insertion hole of the nut-side pulley, with the shaft portion being inserted through a spring washer, and then, tightening the shaft portion into an internal thread of the nut until a dimension of the spring washer becomes shorter than a free length and longer than a fully compressed length; an axis deviation adjusting step of adjusting a position of the nut-side pulley relative to the nut to decrease a deviation of the nut-side pulley relative to a rotation axis of the nut after the temporary tightening step; and a final tightening step of further tightening the fastening bolt after the axis deviation adjusting step.

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.

Embodiments of the present disclosure may provide an electric power steering apparatus that controls the vehicle regardless of the driver's will to steer, even in the case of a truck or a bus requiring a relatively large steering force compared to a passenger car. Embodiments of the present disclosure may provide an electric power steering apparatus that can increase the convenience of the driver by enabling additional functions such as automatic parking, lane maintenance, driving assistance according to road surface conditions, and autonomous driving control to be used. Embodiments of the present disclosure may provide an electric power steering apparatus in which steering is stably performed even if one motor malfunctions or is damaged.

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 power steering device includes: first and second load transition regions provided in first and second predetermined ranges in a nut side ball screw groove from the other end side openings of the first and second connection passages along the nut ball screw groove, formed so that radial distances between a rotation axis of the nut and the nut side ball screw groove are gradually increased toward the other end side opening of the first and second connection passages, and formed so that the balls pass through first and second no load regions, and then pass through a first load region, when the balls in the first and second predetermined ranges are moved from the other end side opening of the first and second connection passages along the nut side ball screw groove.

The present invention provides a rack assist type electric power steering apparatus. The power steering apparatus includes: a ball nut coupled to a rack bar via balls to be rotated, and configured to cause the rack bar to slide; a bearing mounted on an outer peripheral surface of the ball nut so as to support rotation of the ball nut; and a support member coupled to at least one of a space between one side of an outer race of the bearing and a housing and a space between the other side of the outer race of the bearing and the housing so as to support the bearing.

A steer-by-wire control system adapted for use with a material handling vehicle such as a forklift includes a controller programmed to receive input indicative of a desired direction of travel of the material handling vehicle and to control an actuator coupled with the steered wheels of the material handling vehicle to change the direction of travel of the vehicle.

A steering device of the present invention has a steered shaft rotation stopper (100) having a contact member (101) and a forcing member (102). The forcing member (102) forces at least either one of a steered shaft (6) or the contact member (101) in a direction in which the steered shaft (6) and the contact member (101) push against each other. In a state in which the contact member (101) contacts a contact portion (6D) of the steered shaft (6), the contact member (101) stops a rotation of the steered shaft (6).

A steering actuator apparatus for a vehicle may include: a housing, a driving unit configured to be supported by the housing and generates a driving force, a transmission shaft, which is installed inside the housing to be movable, moves back and forth by receiving the driving force from the driving unit, and varies a steering angle of a wheel, a measurement unit configured to measure the steering angle of the wheel in conjunction with a movement of the transmission shaft, a first rotation prevention unit provided between the housing and the transmission shaft and fixed to the transmission shaft and a second rotation prevention unit, which is detachably coupled to an outside of the housing and interferes with the first rotation prevention unit to prevent relative rotation of the housing and the transmission shaft.