A linear actuator (1) and the centrifugal safety device (50) thereof is disclosed. The safety device (50) includes an outer socket (51) having a stop portion (512) and a first accommodation portion (513), an inner socket (53) having a raised portion (531) and a second accommodation portion (532) and a centrifugal assembly (55) having a centrifugal block (551) and an elastic element (555). The inner socket (53) drives the centrifugal assembly (55) to rotate. If the centrifugal force of the centrifugal block (551) is smaller than the elasticity of the elastic element (555), then the centrifugal block (551) is limited in the second accommodation portion (532) by the elastic element (555), or else the centrifugal block (551) moves into the first accommodation portion (513) and clamped by the raised portion (531) and the stop portion (512).

A ball screw having a threaded stem including a ball groove formed in an outer surface thereof, a ball nut including a central bore formed by an inner surface thereof, the inner surface defining a ball groove, a first recess extending inwardly from an end face of the ball nut and into the ball groove of the inner surface, and a stop pin disposed in the first recess so that a first end of the stop pin extends inwardly into the ball groove of the inner surface of the ball nut, wherein the stop pin is formed by a coiled strip of metal.

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 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.

Disclosed is a linear actuator, including a housing, a drive worm, a rotating screw and a drive nut. The drive worm drives the rotating screw to rotate. The rotating screw rotates to drive the drive nut to move axially along the rotating screw. A clutch means is arranged between the drive worm and the rotating screw. The clutch means includes a coupling gear sleeve axially movable relative to the rotating screw. The rotating screw is sleeved with an axial limiting sleeve. The axial limiting sleeve and the housing are abutted axially. The axial limiting sleeve and the rotating screw maintain alignment in an axial direction. When the rotating screw is subjected to an axial load, the rotating screw transmits axial force to the housing through the axial limiting sleeve, and the axial force is not transmitted between the coupling gear sleeve and the axial limiting sleeve in the axial direction.

An alignment device is provided to draw two components together in an aligned configuration. An example alignment device comprises a planetary gear set including a ring gear and at least two planetary gears and one or more side plates for supporting the gears. Each of the planetary gears includes an aperture sized to receive a threaded fastener for engagement with a respective threaded rod that is engaged with one of the two components, wherein rotation of the ring gear imparts rotational movement to the threaded fasteners to cause synchronized advancement of the alignment device along the threaded rods.

An alignment device is provided to draw two components together in an aligned configuration. An example alignment device comprises a planetary gear set including a ring gear and at least two planetary gears and one or more side plates for supporting the gears. Each of the planetary gears includes an aperture sized to receive a threaded fastener for engagement with a respective threaded rod that is engaged with one of the two components, wherein rotation of the ring gear imparts rotational movement to the threaded fasteners to cause synchronized advancement of the alignment device along the threaded rods.

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.

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.

A valve includes a set screw that is screwable into and out of a complementary female threaded opening in a valve part for changing a setting of the valve, for changing an adjustable flow restriction of the valve, in which the set screw includes a free outer end that projects outside the valve part, and a gripping part on its free outer end for a tool to be engageable thereupon. The free outer end of the set screw includes a male thread onto which a locking nut is screwed. A protective cap is provided for covering the free outer end, that includes a first cap portion with a rotation space for fitting freely rotatable over the locking nut, and a second cap portion with a complementary female thread that is screwed onto the male thread towards a locked position.