An electric actuator for a steering system is adapted to control an angle of steered wheels on a vehicle to adjust a direction of travel of the vehicle. The electric actuator includes a housing assembly, an electric motor, and an actuation unit. The housing assembly is arranged around the electric motor and the electric motor is coupled with the actuation unit and configured to cause an actuator rod of the actuation unit to move relative to the housing assembly.

According to one aspect, a downhole apparatus includes an anchor element mechanically coupled between first and second housings and linked to move radially between first and second radial positions; and a high torque electromechanical trans mission drive; wherein the anchor element is adapted to engage a preexisting structure when the downhole apparatus extends within the preexisting structure, the high torque electromechanical transmission drive is energized, and the anchor element is in the second radial position; and wherein the high torque electromechanical transmission drive is failsafe in that the anchor element is permitted to move radially from the second radial position towards the first radial position in response to de-energization of the high torque electromechanical transmission drive. In several embodiments, the preexisting structure is a casing positioned within a wellbore that traverses a subterranean formation.

A lead screw operated drawout mechanism for an electrical system is disclosed. The lead screw operated drawout mechanism includes a lead screw, a nut, a drive shaft and a connecting mechanism. The lead screw is supported on a support frame in a way such that the lead screw rotates with respect to the support frame. The nut is disposed on the lead screw, wherein rotary motion of the lead screw facilitates linear motion of the nut on the lead screw. The drive shaft is rigidly disposed on the nut and configures linear motion along with the nut. The connecting mechanism is functionally connected to the drive shaft and the electrical system for facilitating activation and de-activation of the electrical system.

An exoskeleton includes a first support, a second support, and a joint connecting the first and second supports. An actuator causes relative rotation between the first and second supports at the joint. The actuator includes a motor, a ball screw, a ball nut, and a yoke. The motor causes translation of the yoke via the ball screw and the ball nut. In some embodiments, the actuator further includes a roller and a joint cam having a track. Translation of the yoke causes movement of the roller within the track, and movement of the roller within the track causes rotation of the joint cam. In other embodiments, the actuator further includes a linkage and a joint crank. Translation of the yoke causes movement of the linkage, and movement of the linkage causes rotation of the joint crank. Rotation of the joint cam or the joint crank causes relative rotation between the first and second supports.

A transmission device includes: a shaft member, in the outer circumferential surface of which is formed a male thread centered about a second axis perpendicular to a first axis of a friction clutch; a screw member has a female thread that meshes with the male thread; an arm reciprocates together with the screw member; a first cam member couples to the arm to regulate the rotation of the screw member and rotates around the first axis; a second cam member has a cam surface that is oriented in the direction of the first axis to oppose a cam surface of the first cam member; and a rolling member is disposed between the two cam surfaces to roll on the two cam surfaces; the first cam member or the second cam member subjects the friction clutch to a force oriented in the direction of the first axis.

There is provided a solar power generation system comprising: a main body being hollow and having an inner space defined therein, wherein the main body has a top hole defined in a top wall thereof; a rotation assembly received in the main body; a hydraulic or pneumatic cylinder assembly received in the main body; a power generation assembly configured to be withdrawn from the main body or retracted into the main body through the top hole using the hydraulic or pneumatic cylinder assembly, wherein the power generation assembly has a solar cell structure at a top end thereof, wherein the rotation assembly is configured to change an orientation of the solar cell structure; a controller configured to control operations of the rotation assembly and the hydraulic or pneumatic cylinder assembly.

A lever mechanism for converting a motion from linear to rotary includes a guiding bar, a slider which slides along the guiding bar, and a lever. The lever includes a cylindrical element and a pair of slot links which are fixed frontally on the cylindrical element and between which the slider is arranged. The slider includes at least two bushes for supporting a pivot which is adapted to act on the slot links. The bushes are mutually separated by a space to accommodate a reserve of lubricant.

A ball screw and nut mechanism has a screw in cooperation with a nut via balls that can circulate in a raceway formed by the opposing threads of the screw and nut. The nut has a recirculation insert passing therethrough from the outer face to the thread, the recirculation insert having a first end with a ball transfer groove turned towards the screw. The mechanism has a holding body for holding the recirculation insert in the housing, the recirculation insert having a second end with a shoulder bearing on the nut, the second end of the recirculation insert having an orientation lug having an angular position predetermined and fixed relative to the ball transfer groove, the orientation lug cooperating with a guide relief of the holding body to fix an orientation of the recirculation insert such that the transfer groove is adjusted to the raceway.

A hand-held power tool having a motor, a cutting member and a transmission linking the cutting member to the motor, the motor and the transmission being housed in a main housing, the transmission having a ball screw/nut mechanism with a screw and a nut, one of the screw and the nut being rotatably engaged with the motor, and the other of the screw and the nut being linked to the cutting member. The tool has a protective housing for protecting the ball screw/nut mechanism, separate from the main housing, and a sliding seal cooperating with an inner face of the protective housing, the sliding seal being driven by one of the nut and the screw linked to the cutting member, the sliding seal being rigidly connected respectively to one of a sleeve covering the nut and a cap protecting the screw.

A method of attaching the adjustment mechanism of a linear actuator with the drive assembly of the linear actuator without the use of traditional assembly techniques such as threaded fasteners, welds or rivets, so that when the adjustment mechanism and drive assembly are aligned and assembled, they lock together.