An actuator includes a housing, an extension arm, and a threaded spindle. The threaded spindle is mounted on the housing in such a way as to be rotatable with respect to an axis of rotation by a first rotary bearing. The extension arm projects out of the housing in such a way that it can be moved in a direction of the axis of rotation. The housing and the extension arm together delimit an internal space, the volume of which changes when the extension arm moves. A first end of the threaded spindle that is remote from the first rotary bearing, projects into a tubular section of the extension arm, irrespective of a position in which the extension arm is situated. The tubular section extends with a constant internal cross-sectional shape along the axis of rotation.

A hand-held tool (1) manually operable to compress or cut, the tool (1) being elongated bar-shaped or gun-shaped and including a casing (2) forming a grip portion, a motor (3) supported by the casing (2), a reduction and conversion mechanism (5) supported by the casing (2) and connected to the motor (3) and to an actuating member (6). The reduction and conversion mechanism (5) is configured to make the actuating member (6) translate along an actuating axis (7) in response to a rotational motion of the motor (3). A working head (8), connected to the casing (2), interacts with the actuating member (6) so that the working head (8) performs a compression or cutting movement in response to the translation of the actuating member (6). The reduction and conversion mechanism (5) has a conversion mechanism (9) with a planetary roller screw (10, 12, 14).

Embodiments of an electric linear actuator may include a roller screw assembly, an electric motor coupled to the roller screw assembly, and a linear transducer operatively coupled with the roller screw assembly. The motor may be configured to drive the roller screw assembly to extend and retract another component, such as a rod. In some embodiments, the linear transducer may be configured to detect a position of the rod. The roller screw assembly may be coupled directly to the motor via a gear coupling, with the motor disposed generally in axial alignment with the roller screw assembly. Other embodiments disclosed herein include a veneer lathe carriage with electric linear actuators and corresponding apparatuses, methods, and systems.

An actuator for rear-axle steering system of a motor vehicle comprises a threaded spindle (2) which is surrounded by planets (21), each provided with a corresponding profiling (8), wherein the planets (21) are guided in a driven cage (13) and, via further profiling (25), contact a nut (4) that surrounds areas of the planets (21) provided with said profiling (8) and is supported with respect to the cage (13) by rolling bearings (14), and wherein the cage (13) is mounted in a housing (20) by means of further rolling bearings (30, 31, 32, 33) and is non-rotatably connected to an output-side component (12, 34) of a further transmission (10, 11, 12).

An electromechanical linear actuator may include: a containment structure; a pushing member designed to translate relative to the containment structure to at least partially come out of the containment structure during operation of the electromechanical linear actuator; a mechanical reduction apparatus in the containment structure and configured to rotate about an axis of rotation; motor means in the containment structure operably connected with the mechanical reduction apparatus to rotate about the axis of rotation; a shaft inserted in the mechanical reduction apparatus and connected to the pushing member, wherein the shaft is mechanically connected with the mechanical reduction apparatus so that a rotational movement of the mechanical reduction apparatus will cause the shaft to translate along the axis of rotation; and a rotation-preventing mechanism operable on the shaft to prevent the shaft from rotating about the axis of rotation.

A load sensor to be used in an electromechanical brake system includes a flange member capable of deflecting when receiving, at a load receiving portion, a load from the axially front side; a support member capable of supporting the flange member from the axially rear side, at a support portion displaced from the load receiving portion in a radial direction orthogonal to the axial direction; and a displacement detecting mechanism configured to detect the amount of relative movement between the flange and support members. A variable detection sensitivity mechanism enables the relative movement amount with respect to the change of the load applied to the flange member to be larger in a low load range in which the load is equal to or lower than a predetermined load value than in a high load range in which the load is higher than the predetermined load value.

Provided is a reverse input blocking clutch capable of easily releasing a state in which rotation of an output member is prevented or suppressed.

The reverse input blocking clutch 5 includes an input member 14, an output member 15, a pressed member 16, and an engaging member 17. When a rotational torque is inputted to the input member 14, the engaging member 17 moves in a direction away from a pressed surface 28 of the pressed member 16 due to engagement with the input member 14, and transmits the rotational torque inputted to the input member 14 to the output member 15 due to engagement with the output member 15; and when rotational torque is reversely inputted to the output member 15, moves in the direction closer to the pressed surface 28 based on engagement with the output member 15, and by being pressed against the pressed surface 28 does not transmit the rotational torque reversely inputted to the output member 15 to the input member 14, or transmits only part thereof to the input member 14 due to engagement with the input member 14.

A method for operating an actuator arrangement for a clutch operating system includes providing an actuator arrangement with a transmission, a piston, and an inductive sensor device. The transmission has an electric motor and a metal lead screw that converts a rotary motion into a linear motion. The piston is connected to the metal lead screw. The method also includes energizing the electric motor to linearly displace the metal lead screw in an axial direction, axially displacing the piston with the metal lead screw, using the metal lead screw as a target for the inductive sensor device, and using the inductive sensor device to determine an axial distance traveled by the piston.

A roller screw system includes a spindle defining a longitudinal axis about which the spindle rotates. A nut at least partially radially surrounds the spindle. The nut is configured for longitudinal motion with respect to the spindle. At least one non-helically grooved roller is interposed radially between the spindle and the nut. A cage maintains the at least one roller in position radially between the spindle and the nut and supports the at least one roller for rotational motion. The nut is moved in longitudinally in a duty cycle responsive to transmission of rotational motion from the spindle to the at least one roller, and transformation of rotational motion of the at least one roller to longitudinal motion of the nut. A home position of the nut and a home position of the cage both move longitudinally after a predetermined number of duty cycles.

The invention relates to a roller screw mechanism comprising a screw (110) provided with an external thread; a nut (130) coaxially surrounding the screw (130) and provided with an internal thread; and rollers (120), each of which is provided with an external thread, each roller (120) being interposed between the screw (110) and the nut (130) so that the threads of the rollers mesh with the threads of the screw and of the nut; said roller screw mechanism being characterized in that the threads of the rollers are complementary to the threads of the screw and of the nut so that, at zero load, the threads of the rollers co-operate on both of their flanks with the threads of the screw and of the nut in a contact geometry having curvilinear segments.