Abstract: A linear actuator includes a planetary gear system includes a sun gear, a ring gear, and a planet carrier. A linear output mechanism is coupled to the planetary gear system. A first motor is configured to drive a first input shaft, and the first input shaft is coupled to the planet carrier. A second motor is configured to drive a second input shaft, and the second input shaft is coupled to the ring gear. A first brake is coupled to the first motor and is configured to be engaged into a braked position that holds the planet carrier fixed. In the braked position, rotation of the ring gear results in rotation of the sun gear for linear displacement of the linear output mechanism.

Abstract: Fail-fixed hydraulic actuator systems for aircraft include a hydraulic actuator having a piston in a housing. The piston separates the housing into a retract cavity and an extend cavity. A sleeve is moveably arranged within the housing and includes a sleeve aperture that is aligned with a piston head during normal operation. A driving mechanism is configured to drive movement of the sleeve to maintain alignment between the sleeve aperture and the piston head. A low pressure cavity is defined between an interior surface of the housing and the sleeve and, when the piston head is offset from the sleeve aperture, the low pressure cavity is hydraulically connected to one of the retract cavity or the extend cavity to cause a pressure differential with the other of the extend cavity and the retract cavity and cause movement of the piston head to align with the sleeve aperture.

Abstract: An actuator is for use in petroleum exploitation and is configured for displacing a rod for engaging a well barrier device. The actuator has a housing for at least a portion of the rod; at least two roller screws rotatably arranged in the housing; rotational means connected to the roller screws via one gear systems for each roller screw for simultaneous rotation of the roller screws; and a roller nut engaging each roller screw. The roller screws and roller nuts are configured such that rotation of the roller screws result in displacement of the roller nuts relative to the roller screws. Each roller nut is coupled with one actuation element via spherical bearings, and each actuation element is configured for mechanical coupling to an end portion of the rod for displacing the rod in operational use.

Abstract: The invention relates to a method for locking a mobile element (101) of an aircraft, such as a hold door or a landing gear, the mobile element being moved between a deployed position and a closed or retracted position by means of an actuator (200) having a sliding stem (3) coupled to the mobile element, the stem being mounted so as to be able to slide in a body (1) of the actuator between an extended position corresponding to the deployed position of the mobile element and a withdrawn position corresponding to the closed or retracted position of the mobile element. The method of the invention comprises the step of positively blocking the sliding stem of the actuator in the withdrawn position.

Abstract: A compression assembly/system for a front suspension fork for a bicycle is disclosed. The compression assembly/system of the front suspension fork may comprise a combination of improved functional assemblies including a hydraulic bottom-out assembly/mechanism and a low-speed compression assembly/mechanism and a high-speed compression assembly/mechanism. The compression assembly/system of the front suspension fork may comprise an externally-adjustable hydraulic bottom-out mechanism; and substantially co-located external adjustment controls for bottom-out mechanism and low-speed compression mechanism and high-speed compression mechanism. The compression assembly/system may also comprise an axially-oriented (compression) mechanism configured to transmit movement/adjustment radially from inner components to outer components of the mechanisms to be adjusted.

Abstract: An improved structure of linear actuator includes an actuator including a gear set having a friction portion located at the periphery of the gear shaft of a driven gear thereof, a one-way bearing mounted on the gear shaft for rubbing against the friction portion to brake the driven gear from reverse rotation, a driver for driving the gear set and a transmission mechanism including a lead screw coaxially coupled to and rotatable by the gear shaft of the driven gear and a retractable tube assembly coupled to the lead screw and movable by the lead screw between an extended position and a received position, and a stopping mechanism including a thrust bearing coupled to the gear shaft of the driven gear and stoppable against an inner race of the one-way bearing inner race to bear an axial thrust load.

Abstract: An actuator is driven even if a jammed state, a motor stop, or the like occurs. An electromechanical actuator includes: an electric motor attached to a housing; a conversion mechanism portion having a drive portion that is driven to rotate by the electric motor and a driven portion that is driven by the drive portion and advances and withdraws in a predetermined advancing and withdrawing direction, the conversion mechanism portion being accommodated in the housing; a sliding support mechanism that transmits rotational force of the electric motor to the drive portion and allows the drive portion to slide in the advancing and withdrawing direction with respect to the electric motor; and a piston portion controlled so as to be at a predetermined position in the advancing and withdrawing direction with respect to the housing by means of pressure of a fluid supplied to and discharged from the housing.

Abstract: A subsea electric actuator comprises an electric motor and a telescopic drive connection (8) from the motor to a drive unit (10, 11, 12) which can be moved to and fro and converts rotary motion of the connection to linear motion of an actuating stem (5). A return spring (14) is operable on the drive unit to urge the actuating stem towards a datum state. An electromagnetic latch (15) is operative when set to maintain the drive unit in a predetermined position so as to decouple the action of the return spring whereby the stem can be advanced and retracted relative to the drive unit free from the action of the return spring. De-energization of the latch allows the return spring to operate on the drive unit to return the actuating stem to the datum state. Various forms of electromagnetic latch are described.

Abstract: The invention relates to a drive device (20) for entrance/exit devices for public transit vehicles, comprising a drive unit (22) disposed in and driving a column (24) that rotates about an axis of rotation Z-Z during opening and closing operations, said column opening and closing an entrance/exit device. The drive unit (22) is supported in the vehicle by way of a support component (40) and the support component (40) acts as a counterbearing for a torque of the drive unit (22). A coupling device (72) is disposed between the drive unit (22) and the support component (40), said coupling device facilitating a rotation of the drive unit (22) about the axis of rotation Z-Z when a limit of the torque acting on the drive unit is exceeded.

Abstract: An actuator comprising a body in which a rod is mounted to slide, the actuator including a screw extending inside the rod to co-operate with a nut secured to the rod, the screw being driven in rotation by a motor. The rod is associated with a piston that slides in a cavity of the body so as to define two chambers therein, the chambers being filled with hydraulic fluid and being put into communication via fluid transfer means fitted with at least one regulator member adapted to throttle the fluid expelled from one of the chambers, in at least one travel direction of the rod.

Abstract: An actuator for a wheel guiding element of motor vehicle wheel suspensions, with a first, preferably electrically driven actuating drive which selectively changes the length of the wheel guiding element, in the actuator there being a compensation spring which counteracts the compressive forces acting on the wheel guiding element. According to the invention, the pretensioning force of the compensation spring can be changed by means of a second, preferably electrically driven actuating drive.

Abstract: A ball nut of a ball screw drive, in which the ball nut is mounted on a threaded spindle via balls. The ball nut has on its inner circumference a ball groove wound helically around an axis that extends over at least one winding, and a deflection body, with deflection ends, arranged on a circumferential face of the ball nut. The deflection ends engage into a recess of the ball nut, and adjoin an end and a start of the ball groove. The deflection body is supported on one side in radial directions and on the other side on a machine part. The deflection body is connected at its axial ends to bearings for mounting on the machine part. The bearings, which project circumferentially, engage into the recesses of the ball nut and are arranged with their bearing faces approximately flush with the outer circumferential face of the ball nut.

Abstract: An actuator comprises a first actuator arrangement operable to allow relative axial movement to occur between a first component and a second component, a second actuator arrangement operable to allow relative axial movement to occur between a third component and a fourth component, brake means operable to prevent extension of the first and/or second actuator arrangement, and damping means operable to control the rate of extension of at least one of the first and second actuator arrangements.

Abstract: An actuator (A) of a steering lock device includes a tubular member (17) that is fitted around an outer periphery of a lock pin (14) and is rotated by an electric motor (19), a helical cam groove (14e) is provided, among an inner peripheral face of the tubular member (17) and an outer peripheral face of the lock pin (14), in the outer peripheral face of the lock pin (14), a ball (21) is disposed between the cam groove (14e) and a ball retaining groove (17a, 17a) of the tubular member (17), and a guide pin (23) implanted in the lock pin (14) opposes a cam face (17d) formed on the inner peripheral face of the tubular member (17).

Abstract: An actuator is arranged to move an aircraft component such as a landing gear leg, flap or aileron between a first position and a second position, net load from external forces acting on the aircraft component tending to drive it towards the first position. The actuator comprises a threaded screw and a threaded nut. A main prime mover is configured to apply torque to the screw or nut acting in opposition to the net load under normal operating conditions. An emergency prime mover is configured to apply torque to the screw or nut acting in the same sense as the net load under emergency operating conditions in which the interface between the nut and the screw has become partially jammed to the extent that the component cannot be moved from the second position to the first position by operation of the net load alone.

Abstract: An electromechanical linear actuator includes a pneumomechanical back-up system to ensure extension of retractable landing gear for landing an aircraft. Structurally, the linear actuator includes a stator forming a channel for receiving a ball screw. Further, the actuator includes a ball screw housing forming a chamber for receiving the ball screw. Specifically, the ball screw and the housing are in threaded engagement to translate rotation of the ball screw into axial extension of the housing. To power electromechanical extension of the actuator, the ball screw is selectively engaged to a motor with a gear train. Importantly, fluid communication between the ball screw housing and a pressurized fluid is selectively provided by a valve. If electromechanical extension of the actuator fails, the gear train is disconnected from the ball screw and the pressurized fluid is introduced into the chamber to drive pneumomechanical extension.

Abstract: A tank washer comprising a housing which supports reciprocating spray nozzles for spaying the walls of a tank which is to be cleaned with a cleaning liquid. The reciprocation of the spray nozzles is controlled by a piston that reciprocates in the housing under the force of the cleaning liquid. A piston assembly for use in a tank washer comprising a piston head and a connecting rod having one end connected to said piston head. The piston is mounted in a piston chamber for reciprocation.

Abstract: An actuator comprises a first actuator arrangement operable to allow relative axial movement to occur between a first component and a second component, a second actuator arrangement operable to allow relative axial movement to occur between a third component and a fourth component, brake means operable to prevent extension of the first and/or second actuator arrangement, and damping means operable to control the rate of extension of at least one of the first and second actuator arrangements.

Abstract: A manually and/or fluid-pressure operated rotary actuator is coupled with a power screw in a compact assembly to produce large linear thrust. The actuator is operated in both directions by fluid pressure or in one direction by fluid pressure and in the other by spring energy, or by fluid pressure alone or in combination with manually applied force. The actuator has a cylindrical housing, a cylindrical reaction member inside of the housing, a cylindrical piston partially covering the reaction member, a cylindrical rotor partially covering the piston, a device forcing rotation of the piston when moving axially with respect to the reaction member and/or rotor, a plunger engaged with the rotor and restrained from turning with respect to the housing, a base through which the plunger extends, a spring connected to the rotor and housing, a two port assembly, and a handle affixed to the reaction member for manual operation.

Abstract: An actuation device for adjusting a powered control device opposite the adjusting direction. The actuation device comprises an actuation element axially displaceable in a housing by a feed device at least in the adjusting direction. The actuation device includes an emergency actuation arrangement that may be actuated from outside the housing of the device. The emergency actuation arrangement is connected in motion with the feed device via a direction-switched coupling device. The feed device includes at least one motor for turning a rotating spindle. The at least one motor is rigidly connected with a rotating sleeve mounted capable of rotating in the housing and surrounding the rotating spindle. The rotating sleeve is capable of being set in a direction opposite the feed direction of the rotating spindle relative to the housing.

Abstract: An electric actuator comprises a gear mechanism which transmits the rotary driving force of a rotary driving source, and a ball spline mechanism which includes a ball spline shaft provided movably back and forth from a connecting block to the outside and which converts a rotary motion transmitted by the gear mechanism into a rectilinear motion. The electric actuator has a ball spline nut which is externally fitted to the ball spline shaft to be meshed with the gear mechanism and which is integrally formed with a gear section having a plurality of teeth arranged circumferentially about the gear section.

Abstract: A system for allowing a wide selection of components to affect a desired result in the positioning business. Up to nine axes of coordinated motion are offered each of which may use a servomotor, a single or double rod air cylinder. The control for the system is a series of digital commands that cause the cylinder to accelerate, decelerate, maintain a given velocity, stop or pause and repeat a series of commands. It uses a low power servo system which, when activated, opens an air valve to an air cylinder which then moves until the valve actuator is turned off by the cylinder thus causing the air cylinder to follow the lower power servo system.

Abstract: An actuator combining mechanical and hydraulic forces includes a cylindrical body and a piston that can slide relative to the cylindrical body. The piston and the cylindrical body are connected by a mechanical system for transmitting mechanical power that constitutes a device that permanently controls the position of the actuator, a permanent locking device, and a safety device. The device for transmitting hydraulic power constitutes a load compensator device. The two power transmitting devices operate in parallel. Position control using the drive system at reduced power can be synchronized in a simple way for a plurality of actuators.

Abstract: A self-backdriving jackscrew apparatus including a biasing member connected to a screw portion of a jackscrew that exerts backdriving force on the screw to turn the screw in a rotational direction that returns a nut portion of the jackscrew to a home position on the screw.

Abstract: A linear actuator includes a screw shaft rotatably supported within a housing with play in motion in the axial direction of the screw shaft, and a cushioning stopper disposed between the housing and the screw shaft and elastically deformable to absorb a force acting from the screw shaft to the housing when the screw shaft is forced to move relative to the housing in the axial direction within the range of the play at an abutment of a rod with an obstacle or stopper. When the rod is stopped moving, the motor current increases with the degree of elastic deformation of the cushioning stopper. An overload sensor cuts off the supply of power to an electric motor when excessive current in the motor is detected.

Abstract: The invention relates to an actuating device (1) for displacing a control device (3), against a force in the opposing direction (2) to the displacement, comprising an operating element (7) in a device housing (4), which may be axially displaced, at least in the direction of displacement by means of a feed mechanism (6). In order to improve said actuating device such that it may be simply operated without any impairment in emergency, when, for example the energy supply fails, or other problems occur, said actuating device comprises an emergency actuator, which may be externally operated and which may be connected to the feed mechanism (5) by means of a directional coupling device.

Abstract: A self-backdriving jackscrew apparatus including a biasing member connected to a screw portion of a jackscrew that exerts backdriving force on the screw to turn the screw in a rotational direction that returns a nut portion of the jackscrew to a home position on the screw.

Abstract: The present invention provides a ball screw device for linear movement, which moves a working body by using a single of a plurality of ball screw shafts and ball screw nuts. In the ball screw device, a plurality of ball screw nuts are engaged threadedly with the same ball screw shaft. Also, one of the ball screw nuts on each ball screw shaft is attached to the working body via a fixed flange, the single fixed flange or one of the fixed flanges is provided with a load sensor, and other ball screw nuts serve as a fluid pressure supporting mechanism using a cylinder and a piston. A fluid pressure is controlled so that the support force of the fluid pressure supporting mechanism is equal to the pushing force detected by the load sensor. By this configuration, a large load can be distributed evenly to the ball screw nuts.

Abstract: An actuator has a linearly elongate frame, side, end, and top covers detachably and selectively mounted on side surfaces of the frame, a table mechanism displaceable in the axial direction of the frame in response to energization of an electric motor, and a ball screw for transmitting drive forces from the electric motor to the table mechanism. The operator can select various actuator configurations depending on the environment in which the actuator is to be installed and the application in which the actuator is to be used. In the preferred embodiment, the ball screw is used in combination with a piston/cylinder arrangement for moving the table mechanism in a linear direction. The piston/cylinder having a magnetic coupling for coupling the piston to the table mechanism.

Abstract: An actuator for vehicle-door locking mechanism, includes a driving motor, a first deceleration mechanism for decelerating a rotation of the driving motor, a lead screw to which the rotation of the driving motor is transmitted through the first deceleration mechanism, a nut member fitted on the lead screw and moved in an axial direction of the lead screw in accordance with a rotation of the lead screw, an output mechanism for causing a door locking mechanism to perform one of a locking operation and an unlocking operation in association with the movement of the nut member, a second deceleration mechanism for decelerating a rotation of the lead screw, and an automatic bidirectional-returning mechanism to which the rotation of the lead screw is transmitted through the second deceleration mechanism, the automatic bidirectional-returning mechanism including a single home-returning coil spring for automatically returning the nut member to an initial position after the output mechanism performs one of the locking op