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.

A linear motion device and a linear motion device component are provided. The linear motion device includes a screw, a nut, an end cover, and a scrape plate. The nut is fitted over the screw, and a spiral outer groove of the screw and a spiral inner groove of the nut correspond to each other to form a ball groove. The end cover is fixed to the nut. A first through hole portion is defined through the end cover and corresponds to the nut. An engaging groove is arranged on a first surface of the end cover. The scrape plate is assembled with the end cover. A second through hole portion is defined through the scrape plate and corresponds to the nut. An engaging member is arranged on the scrape plate and assembled with the engaging groove.

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 ball screw device includes a screw shaft that has a first helical groove on an outer circumference, a nut that has a second helical groove on an inner circumference, a plurality of balls, a stopper provided at an end portion of the second helical groove, and a spring body that is placed between an end portion ball closest to the stopper and the stopper. The spring body is configured of a plurality of coil springs arrayed along the first helical groove and the second helical groove. The coil springs that are adjacent each have a spring end portion of which rigidity is higher than rigidity of a spring middle portion.

Provided is an electric actuator, including: a driving motor (2); a motion conversion mechanism (6) configured to convert a rotary motion of the driving motor (2) to a linear motion; a transmission gear mechanism (5) configured to transmit a driving force from the driving motor (2) to the motion conversion mechanism (6); and a speed reduction mechanism (3) configured to reduce a speed of the rotary motion of the driving motor (2), and output the rotary motion reduced in speed to the transmission gear mechanism (5), wherein a side of one end portion of a rotation shaft (18) of a gear (16) of the transmission gear mechanism (5) is rotatably supported by a bearing (19), and a side of another end portion of the rotation shaft (18) of the gear (16) is rotatably supported by the output shaft (2a) of the driving motor (2).

A system, method and apparatus for unfolding and folding a multi-arm device that includes a support member and an actuator. A first arm is coupled to the actuator and extends from a folded position to an unfolded position upon actuation of the actuator. A second arm is coupled to the actuator and moves from a folded position to an unfolded position upon actuation of a linkage that causes the second arm to rotate. A third arm moves from a folded position to an unfolded position, via an elbow joint, upon release of a tether attached to the third arm.

A suspension actuator includes a first housing part, a second housing part, a ball screw actuator that is connected to the first housing part and to the second housing part, and an air spring membrane that is connected to the first housing part and to the second housing part. The air spring membrane includes a flexible material and a reinforcing structure that is disposed within the flexible material to resist torsion loads that are applied to the second housing part by the ball screw actuator.

An actuator assembly for an integrated dynamic brake apparatus according to an embodiment of the present invention includes a hollow motor having a stator and a rotor spaced apart from an inner circumferential surface of the stator; a block having one side coupled to one side of the motor and in which chamber that accommodates fluid is formed; a gear unit having one side coupled and fixed to the rotor to convert rotational movement of the rotor to linear movement; a piston configured to receive the converted linear movement from the gear unit to linearly reciprocate; and an electronic control unit coupled to the other side of the block and comprising a motor position sensor configured to detect a position of the motor.

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.

Provided is a mounting member that allows a sensor such as a vibration sensor to be reliably and easily mounted to a moving member such as a nut of a motion guidance apparatus without need of removing the motion guidance apparatus from equipment, and without need of post-processing even when a motion guidance apparatus such as a ball screw is already mounted to the equipment, and a motion guidance apparatus including this mounting member. A mounting member for mounting a sensor to a motion guidance apparatus having a shaft member extending in a longitudinal direction and a moving member that is mounted so as to be movable along the longitudinal direction with respect to the shaft member, the mounting member including: a fixing portion that can be fixed to a fastening hole formed in the moving member; and a sensor mounting portion to which the sensor is mounted.