There is provided a dual rack and pinion rotational inerter system for damping movement of a flight control surface of an aircraft. The system has a flexible holding structure disposed between the flight control surface and a support structure of the aircraft. The system has a dual rack and pinion assembly held by and between the flexible holding structure. The dual rack and pinion assembly has a first rack, a second rack, and a pinion engaged to and between the racks. The system has a first terminal coupled to the first rack and coupled to the flight control surface, via a pivot element, and a second terminal coupled to the second rack, and coupled to the support structure. The system has a pair of inertia wheels adjacent the flexible holding structure. The system has an axle element inserted through the inertial wheels, the flexible holding structure, and the pinion.

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 linear actuator including an electric motor having a stator and a rotor, in addition to a screw drive having a spindle and a nut which is guided by the rolling element on the spindle and which is coupled to the rotor. The nut is mounted in a rotationally fixed manner on a housing component by a planetary roller bearing.

A steering gear for a steer-by-wire steering system of a motor vehicle may include a hollow shaft motor with a stator that is fixed to a housing and a rotatably supported rotor that is arranged coaxially with respect to a longitudinal axis. A worm gear may extend through the rotatably supported rotor. The worm gear comprises a spindle nut that is arranged coaxially relative to the longitudinal axis, that is connected in terms of driving to the rotor, and that is located on a spindle that is displaceable by way of the hollow shaft motor along the longitudinal axis. The angle of inclination of the worm gear may be less than 4.5?.

A steering system equipped with a linear electric actuator includes: a casing, a shaft slidably coupled to the casing with respect to a sliding axis and provided with an end that protrudes externally from said casing, an electric motor, which is housed in the casing and provided with a stator and a rotor that is axially hollow and coaxial with the shaft, in which the rotor is operable in rotation with respect to an axis of rotation parallel to the sliding axis, a nut screw integrated in rotation with the rotor of the motor and provided with an internal thread, the nut screw includes a first cylindrical portion and a second cylindrical portion, axially arranged side by side, a joint adapted to make the first cylindrical portion and the second cylindrical portion integrated in rotation, and a helical groove surface integrated with the shaft and coupled to the internal thread.

An angle-measuring device is provided for a rotationally-driven linear actuator, which can be implemented into a clutch actuator. A rotor element has an axis of rotation and rotates concentrically with a rotor of a rotary drive for an axially movable linear actuator element. A measurement magnet arrangement is fixed relative to the rotor element and has a polarization. The polarization is oriented in such a way that the magnetic field lines can change with a rotation of the rotor element so as to enable the angle to be precisely determined from at least one measurement position. At one location, a 360-degree sensor is provided for measuring angular positions based on the measurement magnet arrangement. At another location, a revolution-counting sensor is provided for counting a number of revolutions carried out based on the measurement magnet arrangement.

A linear stepper motor includes a rotor, two plain bearings, two motor bearing shields, a spindle nut, and a fork-shaped actuating rod. The rotor has a rotor shaft that comprises a motive thread and is configured to drive a linearly guided actuator. The rotor shaft has plain bearing journals at ends thereof, which each comprise an end radially and axially enclosed in the plain bearings seated in the motor bearing shields, and, by the motive thread, axially drives the spindle nut connected with the fork-shaped actuating rod in a rotation-proof manner. The rotor shaft includes a flexurally and torsionally rigid plastic threaded spindle with coaxially arranged metallic shaft ends so as to act as metallic journals on opposite ends for concurrent plain bearing support and axial support.

An electric actuator comprises a housing and an output shaft reciprocatingly received by the housing. There is a screw assembly disposed within the housing and coupled to the output shaft. The screw assembly includes a plurality of annular rollers and a central screw received by the annular rollers. The annular rollers are rotatable about the central screw. There is a motor which includes a stator and a rotor. The rotor has an inner bore which engages the annular rollers. Rotation of the rotor causes the central screw to translate axially relative to the rotor and the output shaft to reciprocate relative to the housing.

A motion control system includes a top mount, a bottom mount, a rigid housing, an air spring, and a linear actuator. The air spring transfers force of a first load path between the top mount and the bottom mount. The air spring includes a pressurized cavity containing pressurized gas that transfers the force of the first load path. The linear actuator transfers force of a second load path between the top mount and the bottom mount in parallel to the first load path. The rigid housing defines at least part of the pressurized cavity and transfers the force of the second load path.

An actuator is provided with means for controlling whether or not forces are transferred between a cylinder 12 (controlled by a motor of the actuator) and an output shaft 14. The output shaft 14 is located between the cylinder 12 and the control rod 18, 38. The cylinder 12 coaxially surrounds the output shaft 14, and the output shaft 14 in turn coaxially surrounds the control rod 18, 38. The control rod 18, 38 has one or more splines 20 on its outer surface facing the output shaft 12. The output shaft 14 has one or more holes 15, each containing a ball bearing 16.