There is provided a dual rack and pinion rotational inerter system for damping movement of a flight control surface of an aircraft having a support structure. The system has a flexible holding structure disposed between the flight control surface and the support structure. The system has a dual rack and pinion assembly held by the flexible holding structure. The system has a first terminal and a second terminal, coupled to the dual rack and pinion assembly. The first terminal is coupled to the flight control surface. The system has a pair of inertia wheels coupled to the flexible holding structure. The system has an axle element inserted through the inertia wheels, the flexible holding structure, and the dual rack and pinion assembly, such that when the flight control surface rotates, the dual rack and pinion rotational inerter system translates and rotates, and movement of the flight control surface is dampened.

Provided is an electric actuator (1), including: a motor part (A); and a motion conversion mechanism part (B). The motion conversion mechanism part (B) includes: a ball screw shaft (33); and a ball screw nut (32), which is rotatably fitted to an outer periphery of the ball screw shaft (33), and is provided so as to be capable of transmitting torque with a rotor (24) of the motor part (A) rotatably supported through intermediation of a rolling bearing (27, 30). The ball screw shaft (33) advances toward one side in the axial direction or retreats toward another side in the axial direction in accordance with a rotation direction of the ball screw nut (32). In the electric actuator (1), a needle roller bearing (47) serving as a thrust bearing is arranged adjacent to the ball screw nut (32) on the another side in the axial direction.

Provided is an electric actuator, including: a motor part; a motion conversion mechanism part; an operation part; and a terminal part, wherein a hollow rotary shaft configured to support a rotor core of the motor part is supported by a rolling bearing so as to be rotatable, wherein the motion conversion mechanism part is coupled to the hollow rotary shaft, and includes a ball screw, wherein a ball screw nut of the ball screw is arranged inside the hollow rotary shaft, wherein the operation part is coupled to the motion conversion mechanism part, and wherein an inner raceway surface of the rolling bearing is formed on the hollow rotary shaft.

A piston pump assembly for a hydraulic power vehicle braking system including an electric motor, a planetary gear set, a helical gear, and a piston which is displaceable in a cylinder. To prevent the piston from rotating in the cylinder, cylinder pins are situated in grooves at an inner side of the cylinder and engage with the recesses in a flange of the piston. Due to reshaping, the grooves are closed at one end, so that the cylinder pins are axially secured.

An explosion proof actuator assembly and servo system is described. Embodiments of the present invention include an explosion proof actuator assembly and servo system that may implement a rotating nut and a threaded member to effectuate an opening and closing of a valve.

A planetary screw actuator is provided which includes a stator; a rotor; a lead screw having external threads thereon; an ovoidal planet screw that meshes with the external threads on the lead screw; an end plate; and a grooved roller bearing (GRB) race disposed between the end plate and the ovoidal planet screw. The GRB race has at least one GRB roller disposed therein.

A rotary position sensor assembly (10) for detecting the angular position of the rotor (104) of a motor. The assembly (10) includes at least one sensor (12) and a sensor target (14) which is moveable relative to the sensor (12). The sensor target (14) comprises a tubular body (16) with a plurality of integrally-formed radially-extending sections (18). These sections (18) include two radial upper edge portions (24) which are supported by a radially-extending support which is set back from the edge portions (24). Each of the two upper edge portions (24) provide a target for the sensor. A sensor target (14) for use in a position sensor assembly (10), a method of production of the sensor target (14), and an electromechanical actuator which utilises the rotary position sensor assembly (10) are also provided.

The disclosure relates to an actuator having a planetary roller screw drive comprising a housing having a cylinder chamber and a fluid reservoir forming one common volume and the housing is filled with a hydraulic fluid. The planetary roller screw drive comprises a spindle having a profiling, which meshes with a plurality of planetary rollers, which are arranged around the spindle and are supported at both ends in a planetary roller carrier. The planetary rollers mesh with an inner profiling of an internal ring gear surrounding the planetary rollers and the planetary rollers are supported in a sleeve surrounding the internal ring gear. According to the disclosure, the planetary roller carrier and/or the sleeve comprise one or more flow ducts connecting the interior and the exterior of a chamber defined radially by the sleeve and axially by the planetary roller carriers to one another.

The linear driving system comprises a motor, a screw shaft and a table. The motor comprises a rotor, a stator and a ball bearing. The stator comprises a shaft part and a spiral part. The shaft part and the spiral part jointly comprise an accommodation space. The spiral part comprises a first helical protrusion formed on the inner surface thereof. The screw shaft is coaxially coupled with the rotor. One end of the screw shaft comprises a second helical protrusion formed on the outer surface thereof, and the screw shaft is accommodated within the accommodation space. The table is fixed on the other end of the screw shaft. The first helical protrusion is engaged with the second helical protrusion. When the rotor is rotated, the rotor drives the screw shaft and the table to move forward or backward linearly in the direction of the axial of the rotor.

In order to improve an adjusting device (100, 100a) for electrically adjusting a headrest position in such a way that the entire adjusting device (100, 100a) can be arranged inside of the headrest, so that the adjusting device (100, 100a) can be made more cost effective and reliable in design, it is proposed that an electric motor be movably arranged relative to a spindle (10, 10a), such that a rotary movement of a rotor of the electric motor induces a translational movement (15) of the electric motor along the spindle (10, 10a), or that a rotary movement of a rotor of the electric motor induces a translational movement (15) of the spindle (10, 10a).