Abstract: A power transfer device may include a support assembly, a bearing assembly, and an axle that has at least one groove that is angled in a predetermined manner. A guide pin may be received within the groove. Rotation of the axle may then cause a linear input to be received by an output component attached to the end of the axle.

Abstract: An entertainment button device includes: an entertainment button that a player can push; and a button-up-and-down mechanism configured to move the entertainment button up and down from a predetermined normal operation position to a protruding position in which the entertainment button protrudes upward from the normal operation position. The button-up-and-down mechanism includes: a shaft member extending in a moving direction of the entertainment button; a rotating mechanism configured to rotate the shaft member; an engagement part configured to move up and down together with the entertainment button; a convex portion having an inverted trapezoid shape and a concave portion having a traperized shape that are formed on an outer periphery of the shaft member; a spiral guide part formed in a spiral manner on one end of the convex portion in a circumferential direction.

Abstract: An entertainment button device includes: an entertainment button; and a button-up-and-down mechanism including: a bias member to bias the entertainment button in a moving-up direction; a shaft member extending in a moving direction of the entertainment button; a rotating mechanism to rotate the shaft member; an engagement part to move up and down with the entertainment button; a convex portion having an inverted trapezoid shape and a concave portion having a trapezoid shape formed on an outer periphery of the shaft member; a spiral guide part on one end of the convex portion in a circumferential direction; a straight part formed on the other end of the convex portion in the circumferential direction. The straight part extends in parallel with a direction of a central axis of the shaft member; and a smoothing guide part extending in a direction orthogonal to the central axis of the shaft member.

Abstract: An electric steering lock device includes: a shaft which includes a male threaded portion and which is rotationally driven by an electric motor; a slider which includes a female threaded portion threadedly engaging with the male threaded portion and which advances and retreats in response to the rotation of the shaft; a lock member which is turnable between a locked position and an unlocked position in response to the advancement and retreat of the slider; a stopper which holds the lock member at the unlocked position by engaging with an engagement portion provided in the lock member, the stopper being movable in a direction orthogonal to a turning plane of the lock member; and a spring for biasing the stopper in an engagement direction. The stopper engages with and disengages from the engagement portion of the lock member by being moved by an operation portion provided in the slider.

Abstract: A rotary table device includes a cooling structure and a rotary bearing provided with a cooling structure. A rotary table device provided with a cooling structure includes a hollow motor as a drive source, a table rotated by the hollow motor, and a rotary bearing supporting rotational motion of the table, in which the rotary bearing includes an outer ring having an inner peripheral surface to which a rolling surface is formed, an inner ring having an outer peripheral surface to which a rolling surface facing the rolling surface of the outer ring is formed, and a number of rolling members in a rolling passage formed by the rolling surface of the outer ring and the rolling surface of the inner ring, and a heat sink is formed to either one of the inner and outer rings.

Abstract: A compact linear actuator in which a back drive force is small and sticking due to abrasion powder and the like hardly occurs, and a rocking controller for a railway vehicle having the linear actuator are provided.

Abstract: An electric actuator has a housing with an electric motor mounted on the housing (2). A ball screw mechanism converts rotational motion of the electric motor to an axial linear motion of a drive shaft. A side-cover (13) is detachably mounted to the housing (2). A guide member (14) is mounted on the inner wall of the side-cover (13). The guide member (14) has a substantially “C”-shaped cross-section and includes a recessed groove (14a) axially extending opposite to the drive shaft (7). A rotation-preventing pin (9), mounted on the outer circumference of the threaded screw shaft (15), engages with the guide member (14) to support the threaded screw shaft (15) so that it can be axially moved relative to the housing (2) but cannot be rotated.

Abstract: Construction assembly (1) for spatial structure comprising a support (10), a screw (50) and a drive shaft (60). The support (10) has a peripheral surface (30, 72) extends along a longitudinal direction (X). The support (10) comprises a first hole (12) extending through said peripheral surface (30) and a second hole (22) receiving the screw (50). The drive shaft (60) is pivotally mounted with respect to the support (10) along the cross axis (Y).

Abstract: A chair with articulable support sections and an integrated lift system may have support sections mechanically linked such that a single actuation control device may articulate multiple sections. The chair includes configurable accessories directed to the comfort of an occupant of the chair. The support sections may include air cells to adjust firmness of support section surfaces.

Abstract: A ball screw unit includes a screw shaft that includes a screw groove, a ball screw nut that is screwed to the screw shaft via balls and that rotates to move the screw shaft linearly in an axial direction of the screw shaft, a hollow shaft that rotates together with the ball screw nut, a housing that rotatably supports the hollow shaft via a rolling bearing, and an elastic member that is provided at a position between the rolling bearing and the housing.

Abstract: A cradle drive mechanism is provided. The cradle drive mechanism includes a drive motor, an intermediate frame and a screw and nut transmission device driven by the drive motor so as to drive linear reciprocating motion of the intermediate frame. The cradle drive mechanism also includes a rotating, shaft having a first driving wheel and a gear, a transmission belt, and a rack meshed with the gear so that, during linear reciprocating motion of the intermediate frame, the rack forces the gear to rotate and drive rotation of the first driving wheel, wherein rotation of the first driving wheel drives rotation of the transmission belt. The cradle drive mechanism also includes a cradle connector fixed on the transmission belt and configured to connect a cradle and to drive linear reciprocating motion of the cradle.

Abstract: The ball screw system comprises a screw having an external threading, a nut having an internal threading and a series of balls being engaged in said threadings to link the screw and the nut, the nut comprising ball recirculation means comprising at least one ball deflection element inserted into a through hole of the wall of the nut, from outside to inside as far as abutment means, in which the nut is equipped with a retaining ring which bears on a peripheral wall of this nut, over at least a part of its length, and which bears permanently against the bottom of at least one groove formed on an external face of said deflection element and in which the retaining ring is engaged.

Abstract: Provided is a linear step motor, the motor including: a motor housing fixedly mounted at an inner surface of a ring-shaped stator and formed with an opening; a rotor rotatably mounted at a space centrally formed at the stator; a cover member coupled to a bearing to open/close the opening; a nut shaft centrally arranged at the rotor, coupled to an outside of the cover member by passing through a shaft hole centrally formed at an inner ring of the bearing, coupled at a periphery by a magnet and formed with a female screw gear-combined with a lead screw member formed at an inner surface with a male screw; and a fixing unit integrally formed with the nut shaft and fixed to the bearing coupled to the cover member.

Abstract: An overload protection in a drive unit for a steady or jack for a caravan comprises an electro-mechanical control system. A spindle is driven by a motor through a gearbox, wherein the motor is controlled through a power supply. A control device in the system comprises a movable part slidably seated on an output shaft of the gearbox, where the movable part is connected with the spindle. Movement between the shaft and the sliding part is counteracted by springs. The slidable part is provided with actuating points that may contact switches by axial movements. When a nut on the spindle reaches an end position, a reactive force in the spindle will cause the part to move against the force of springs, eventually actuating a switch and thereby causing interruption of the circuit, thereby protecting motor and engagement between nut and spindle from electric and mechanical overload.

Abstract: The invention relates to a telescopic actuator comprising a body (1) defining a cylindrical cavity of longitudinal axis (X); a rod (3) mounted to slide telescopically in the cylinder along the said axis; a nut (7) secured to the rod; a lead screw (4) mounted on the cylinder to extend along and rotate about the said axis (X) and collaborate with the nut in such a way that a rotation of the lead screw causes a telescopic movement of the rod in the cylinder; means (8, 9, 10) for driving the rotation of the lead screw. According to the invention, the nut is mounted on the rod to be axially retained thereon by retaining means (12, 13, 14; 30 to 38) which can be made to release the nut axially from the rod.

Abstract: A linear actuator for an aircraft comprising a casing comprising a first casing section and a second casing section, wherein the first casing section and the second casing section are extendible and retractable with respect to each other, and a first drive mechanism and a second drive mechanism disposed in the casing, wherein the first drive mechanism and the second drive mechanism are operable independently of each other to drive at least one transmission element connected to an interior of the casing.

Abstract: Ball screw assembly comprising a screw (2) provided with an outer thread (3); a nut (4) provided with an inner thread (5); a series (6) of balls (7) able to circulate along a circulating path (10) between the screw and the nut, along which the balls are engaged in the threads thereof; and recirculating means (8) defining a recirculating channel (9) to carry balls from one end to the other end of said circulating path (10); The recirculating channel (9) comprising a return channel (14) provided on the nut and, between the ends of this return channel and the corresponding ends of said circulating path, deflecting channels (27, 28) which are defined respectively between surfaces (25) of deflecting elements (20, 21) engaged in respective holes (11, 12) of the nut (4) and local zones (26) of surfaces (16) of these respective holes.

Abstract: An actuator assembly configured to control the movement of a stabilizer includes a ball screw having a longitudinal axis and configured to be rotated by a drive assembly, a primary nut assembly coupled to the stabilizer and received on the ball screw such that rotation of the ball screw causes movement of the primary nut assembly along the longitudinal axis of the ball screw, the ball screw and primary nut defining a primary load path between the between the drive means and the stabilizer, and a secondary nut assembly coupled to the primary nut assembly and configured to engage the ball screw upon failure of the primary load path.

Abstract: An electric actuator has a housing (2), an electric motor (3), a speed reduction mechanism (6), a ball screw mechanism (8) and a rotation sensor (9). The ball screw mechanism (8) has a screw thread shaft (23) that moves axially but cannot rotate relative to the housing (8). A nut (24) is inserted over the screw thread shaft (23) and can rotate relative to the housing (2), via a rolling bearing (11), mounted on the housing (2), but cannot move axially. A swing link (13) is arranged to perform the pendulum motion interlocked with the linear motion of the driving shaft (7). A magnet (18) is mounted on the end of a pivotal shaft (17) to form the reference point of the pendulum motion. The position of the driving shaft (7) is detected by the rotation sensor (9) arranged opposite to the magnet (18) via a predetermined air gap.

Abstract: A linear actuator is provided which includes a motor and a screw as an output shaft and in which the rotational movement of the motor is converted into the linear movement of the screw, wherein at least one retainer to hold a plurality of balls is disposed at the inner periphery of a hollow rotor of the motor, a ball screw is formed at the outer periphery of the screw, the balls are engaged with the ball screw such that the screw is set coaxial to the rotor, and wherein the screw provided with the ball screw is moved linearly by means of the rotation of the balls disposed circumferentially at the inner periphery of the rotor.

Abstract: A disc spring is provided between a ball screw nut and a hollow shaft, and another disc spring is provided between rolling bearings and a housing. When leftward motion of a screw shaft is stopped and a rotational inertia force is applied to the ball screw nut, these disc springs allow the ball screw nut to rotate to a certain degree.

Abstract: An actuator comprises a screw shaft, a nut translatable along the shaft between a retracted position and an extended position, a tine component carried by the nut, the tine component including tine fingers formed with projections each being engageable with a formation provided on a housing when the nut occupies its extended position to secure the nut against axial movement, and a lock member engageable with the tine fingers to restrict radial movement of the tine fingers.

Abstract: A transmission device for a vehicle component adjuster, such as a seat adjuster, may include a drive screw, a drive member and a load transfer member. The drive member engages the drive screw and has a first end with an outer periphery and an end surface. The load transfer member has a first portion disposed at least partially around the periphery of the drive member and a second portion configured to be positioned between the end surface and a support structure supporting the seat adjuster relative to a track arrangement or system. The load transfer member is configured to transfer an axial load applied to the drive member to the support structure.

Abstract: A driving device with a first and second fastening device which can be connected to a stationary base part, particularly a vehicle body, or can be connected to a movable structural component part, particularly a hatch or door of a vehicle, a spindle drive which has a threaded spindle and a spindle nut arranged on the threaded spindle and by which the first fastening device and the second fastening device are movable axially relative to one another, and a rotary drive which drives the spindle drive in rotation by an overload protection device, and the rotationally rigid connection thereof can be canceled when a determined torque is exceeded. The overload protection device is a ring element arranged on a driveshaft of the rotary drive.

Abstract: A small slider unit having a size effectively reduced in the longitudinal direction is equipped with a rail 22; a slide table 23 moving on the rail 22; a screw shaft 26 coupled to the slide table 23 and situated parallel to the rail 22; a motor M for rotating the screw shaft 26; a coupling member 31 for providing the coupling between a rotating shaft 32 of the motor M and the screw shaft 26; and a bearing 29 supporting the screw shaft 26. The screw shaft 26 is rotated by driving the motor M, whereupon the rotation of the screw shaft 26 moves the slide table 23 in the axis direction of the rail 22. The screw shaft 26 has a holding portion 27a, and the bearing 29 is held between the holding portion 27a and the coupling member 31.

Abstract: An electromotive actuator for deflecting a motor vehicle part includes a rotatable component and a non-rotatable component. The rotatable component can be driven by an electric motor in such a way that it can be moved linearly relative to the non-rotatable component between a first position and a second position. In order to create a compact adjustment device, the two components of the actuator are configured respectively as a threaded spindle and a threaded nut, whereby the rotatable component (threaded spindle or threaded nut) is non-rotatably connected to the rotor of the electric motor and can act directly or indirectly on the vehicle part that is to be deflected.

Abstract: A motion converting drive mechanism converting a rotary motion into a linear reciprocating motion includes a motor having an output shaft, a housing case to which the output shaft of the motor is fixed, a reduction gear mechanism including a first pinion and a second pinion meshing with the first pinion, and a screw mechanism having an internal threaded portion and an external threaded portion, one of which is integrally and coaxially formed with the second pinion. The first pinion serving as a helical gear wheel having two to four teeth is rotatably supported by the housing case therein. The first pinion has a rotation axis rotatably and coaxially connected to the output shaft of the motor. The second pinion having a rotation axis arranged in parallel and close to the rotation axis of the first pinion is rotatably supported by the housing case therein.

Abstract: A method for fabricating a rotational-to-linear motion conversion mechanism which can avoid a planetary shaft from being tilted with respect to a sun shaft when the conversion mechanism is assembled. The method includes fabricating a subassembly with the planetary shaft being held in parallel to the sun shaft. The subassembly includes the sun shaft having a first and second sun gear at its opposing ends and a male thread at its center, the planetary shaft having a first planetary gear at its one end and a male thread at its center, a ring shaft having a female thread, and a first and second ring gear. The method also includes mating the second planetary gear with the second sun gear and the second ring gear while the second planetary gear is being fitted over the outer circumferential surface of the other end of the planetary shaft in the subassembly.

Abstract: Clamping means which may be used with soldering pliers, having a first element (18) and a second element (20) relatively displaceable by the action of a screw (10) that can be rotated about an axis (XX) by the action of a motor (M); a nut (12) cooperating with the screw (10) and which can be driven in the direction of the screw axis (XX), the screw being coupled to the first element (18); first guiding means (34L) defining linear guidance parallel to the axis (XX) of the screw to prevent rotation of the nut (12) in a first phase of displacement of the nut; and second helicoidal guiding means (34H) extending with the axis (XX) of the screw (12) and which has an thread inverted in relation to the screw thread to allow the nut (12) to rotate in the same direction of rotation as the screw (10) in a second nut displacement phase; in addition to a compensation system (46) arranged between the first element (18) and a mobile support (14) coupled to the nut (12) in order to reinitialize the position of the first elem

Abstract: In an expansion actuator employing a screw feed mechanism, when a screw feed mechanism (60) formed from a male thread member (58) and a female thread member (59) that are screwed one into the other is driven by a motor (33) via a reduction gear (44), relative displacement between the male thread member (58) and the female thread member (59) in the direction of an axis (L) can be outputted as expansion and contraction due to relative movement of first and second housings (31, 32). Since the screw feed mechanism (60) is disposed so as to surround outer peripheries of the motor (33) and the reduction gear (44), which are disposed on the axis (L), compared with a case in which the motor (33), the reduction gear (44), and the screw feed mechanism (60) are disposed in series on the axis (L), it is possible to make the dimension of the expansion actuator (14) in the axis (L) direction smaller.

Abstract: A feed screw mechanism includes internally threaded member fixed within an output rod. The internally threaded member is threadedly engaged with an externally threaded member connected at axially one end in the direction of an axis thereof to a drive source, so that the output rod is moved in a direction of the axis relative to the externally threaded member by the relative rotation of the externally threaded member and the internally threaded member. The internally threaded member is coupled to the output rod at the axially other end in the direction of the axis by a threadedly coupling portion. Therefore, when pulling loads in directions away from each other are applied to the output rod and the externally threaded member, a compression load can be prevented from being applied from the output rod to the internally threaded member.

Abstract: An electrically powered linear actuator having a thrust assembly, a motor with a rotor surrounding at least a portion of the thrust assembly and a rotary encoder with a rotation sensing member rotatable with the rotor.

Abstract: An electromechanical strut is provided for moving a pivotal lift gate between an open position and a closed position relative to a motor vehicle body. The electromechanical strut includes a housing connected to one of the lift gate and the motor vehicle body. An extensible shaft is slidably mounted to the housing. The extensible shaft is connected to the other of the lift gate and the motor vehicle body. A drive mechanism includes a rotatable power screw. The drive mechanism converts rotary motion of the power screw into linear motion of the extensible shaft to move the extensible shaft between a retracted position corresponding to the closed position of the lift gate and an extended position corresponding to the open position of the lift gate. A power spring includes one end connected to the extensible shaft and another end connected to the housing for providing a mechanical counterbalance to the weight of the lift gate.

Abstract: A motorized anti-backlash linear actuator comprises a motor; a hollow shaft that is rotated about a central axis by the motor, an anti-backlash nut that is nested at least partially inside the hollow shaft; and an externally threaded rod or lead screw that engages with the anti-backlash nut such that the rotation of the hollow shaft and the nut imparts a linear motion to the rod that is substantially free of backlash. Nesting the anti-backlash nut at least partially within the hollow shaft provides greater stability to the actuator, and permits high speed operation.

Abstract: A step-by-step motor able to carry out up-and-down transmission includes a housing, a top rod, a circuit board, a magnet, a coil unit and a cover. The top rod is inserted in an insert hole of the housing, having a wall bored with a cut recess. The circuit board has a position-limiting switch received in an engage groove of the housing and provided with a sidewise rod inserted in the cut recess of the top rod. The magnet is fixed with a connecting member connecting a bearing, and the lower end of the top rod is engaged with the connecting member. The coil unit is fitted around the magnet and positioned in the housing, and the cover is covered on the bottom of the housing. The magnet is driven by the coil unit to rotate and actuate the top rod to move upward or downward steadily.

Abstract: A cylinder device is capable of heightening the feed accuracy of a screw shaft and stably controlling the feed speed of a conveying unit in a wide speed range. A ball screw shaft is inserted through a hollow shaft motor having an end fixed to a housing, and a decelerator that is a planetary reduction gear unit connected to the hollow shaft motor. Each of a pair of ball screw nuts, which are disposed to face each other and between which the hollow shaft motor and the decelerator are placed, meshes with the ball screw shaft. An internal gear is connected to a spacer disposed at an end of an output gear of the decelerator. An external gear connected to the ball screw nut meshes with the internal gear. The output gear of the decelerator meshes with a connection shaft by splines.

Abstract: A ball screw comprising a threaded nut with thread channels for rolling bodies, a threaded spindle with thread channels for rolling bodies, and an intermediate bush, which is arranged between the threaded nut and the threaded spindle, wherein the intermediate bush has thread channels, which face the threaded nut and are adapted to the thread channels of the threaded nut, and rolling bodies are guided in these thread channels, and wherein the intermediate bush has thread channels, which face the threaded spindle and are adapted to its thread channels, and rolling bodies are guided in these thread channels, is proposed, wherein a first threaded arrangement, which is formed by means of the thread channels of the threaded nut and the intermediate bush facing one another, and a second threaded arrangement, which is formed by means of the thread channels of the intermediate bush and the threaded spindle facing one another, operate in opposite directions.

Abstract: Actuating cylinder including a longitudinal cylinder body, a longitudinal cylinder rod traversing a front transverse wall of the cylinder body and a longitudinal means of operating the cylinder rod relative to the cylinder body, the cylinder body including a rear transverse wall situated at a distance from a rear end of the cylinder rod inside the body. The cylinder includes a sensor supported by a front end portion of the cylinder rod; longitudinally deformable linking means to delimit a longitudinal channel of variable length coupling the front end portion of the cylinder rod and the rear transverse wall of the cylinder body and emerging at the rear of this rear transverse wall; and at least one electric connecting wire which is connected to the sensor, which extends in the longitudinal channel and which emerges via the rear end of this longitudinal channel.

Abstract: A linear actuator with a quick-release mechanism allows the unpowered, loaded linear actuator to immediately return to its initial position by operating a rotatable involute cam of the quick-release mechanism. The quick-release mechanism is connected with a remote monitoring system so the current position of the linear actuator can be detected from a distant place.

Abstract: Linear actuator device, comprising a housing (2), an externally threaded screw (5) mounted to a piston (9), an internally threaded extended nut (7) and a motor (16) comprising a stator (33) and a rotor element (30) positioned around the extended nut (7), wherein a plurality of first magnets (31) of the rotor element (30) are positioned in relation to the stator (33) such that the stator (33) lies between the extended nut (7) and the first magnets (31) of the rotor element (30). The advantage of the invention is that linear actuators with a high energy density can be manufactured in an easy and cost-effective manner.

Abstract: A telescopic actuator includes a housing, an output rod which is slidable in an axial direction with respect to the housing, at least two slide bearings via which the output rod is supported by the housing, and a stopper disposed between the two slide bearings. The stopper regulates a moving end position of the output rod.

Abstract: A spindle driving mechanism 5 for a machine tool includes a screw shaft 11 formed with a spiral thread groove 11a in the outer peripheral surface thereof; a ball screw nut 12 that is provided with a spiral nut groove corresponding to the thread groove 11a in the inner surface thereof, and that is configured so as to perform reciprocating motion in the axis direction of the screw shaft 11 with the rotational motion of the screw shaft 11 around the axis; a hollow motor 21 including a cylindrical inner rotor 22 fixedly provided on the outer peripheral surface of the ball screw nut 12 to serve as a field flux producing source, and a cylindrical outer stator 23 for generating a rotating magnetic field for giving a rotational driving force to the inner rotor 22; a cylindrical casing 31 on one end side of which the outer stator 23 is fixedly provided and on the other end side of which a spindle 51 for the machine tool is fixedly provided; and an outer cylinder 41 for guiding the reciprocating motion of the casing 31

Abstract: A magnetic coupling system may be used in a fluid displacement apparatus to magnetically couple a drive shaft to a piston. The magnetic coupling system may include first and second magnetic couplers at the ends of the drive shaft and piston, respectively. The second magnetic coupler is configured to magnetically engage the first magnetic coupler and configured to mechanically engage the first magnetic coupler if the couplers disengage magnetically.

Abstract: A rotation/linear motion conversion mechanism provided with an annular shaft, a sun shaft arranged inside the annular shaft, planetary shafts arranged around the sun shaft, and a first gear mechanism and a second gear mechanism, which transmit force between the annular shaft and the planetary shafts. Each planetary shaft includes a first planetary gear, which configures part of the first gear mechanism, and a second gear, which configures part of the second gear mechanism. The planetary shaft is configured to permit relative rotation between the first planetary gear and the second planetary gear.

Abstract: A motion converting drive mechanism converting a rotary motion into a linear reciprocating motion includes a motor having an output shaft, a housing case to which the output shaft of the motor is fixed, a reduction gear mechanism including a first pinion and a second pinion meshing with the first pinion, and a screw mechanism having an internal threaded portion and an external threaded portion, one of which is integrally and coaxially formed with the second pinion. The first pinion serving as a helical gear wheel having two to four teeth is rotatably supported by the housing case therein. The first pinion has a rotation axis roatably and coaxially connected to the output shaft of the motor. The second pinion having a rotation axis arranged in parallel and close to the rotation axis of the first pinion is rotatably supported by the housing case therein.

Abstract: An intermediate segment of a control or other arm, fitted with a transmission for supporting a following segment is made up of a motor which is displaced towards the other end of the segment, preferably beyond the joint to a previous segment in order to reduce the toppling moment on the segment. The transmission includes a movement conversion device using a screw and nut.

Abstract: A linear actuator orderly comprises an inner pipe, a middle pipe and an outer pipe, and the pipes are pivotally connected with each other. Each pipe is formed with at least three arc-shaped portions and three guiding portions, and the pipes abut against each other. The outer pipe is axially formed with a screw and two positioning rods that are passed through the middle pipe and the inner pipe, respectively. One end of each positioning rod is fixed with a pulling member, and one end of each pulling member is fixed to the inner pipe. The middle pipe is axially formed with a pushing post threaded with the screw. The pushing post and the middle pipe are pivotally disposed with a guiding wheel for rolling the pulling members, respectively. The pipes can be moved by the relative motion of the screw and the pushing post by cooperating with the guiding wheels and the pulling members, such that the pipes can be extended or retracted synchronously.

Abstract: An electrically powered linear actuator having a thrust assembly, a motor with a rotor surrounding at least a portion of the thrust assembly and a rotary encoder with a rotation sensing member rotatable with the rotor.

Abstract: Methods and apparatus are disclosed for providing reduced friction in drive screw assemblies, including electromechanical actuator (EMA) assemblies. A drive screw assembly is disclosed that includes a drive shaft, a drive screw, and a screw head. A stationary guide collar having a guide bore and a support surface receives the screw head or a portion of the drive screw. The guide collar may be fixed in angular relation to the screw head. As the screw head moves on a linear path during rotation of an associated drive shaft, a supported surface slides in only linear motion with respect to the support surface of the guide collar and as a result friction forces due only to linear motion are generated. Rotational friction forces and associated efficiency and power losses are consequently reduced or eliminated in the drive screw assembly.

Abstract: Cutting apparatus having a ram axis gear tube (32) equipped with internal threads engageable with external threads (48) of a main shaft (42). A tool can be fixed to the main shaft (42). The external threads (48) of the main shaft (42) are formed on external splines (44). A main shaft rotation gear (46) has internal splines (41) mating with the external splines (44) of the main shaft (42). Rotation of the ram axis gear tube (32) thus causes the main shaft (42) to move axially via the internal and external threads. Rotation of the main shaft rotation gear (46) causes rotation of the main shaft (42). The tool fixed to the main shaft (42) can thus undergo axial and rotational movements. A motor (74) can be coupled to the main shaft (42) and a motor shaft (63) extended through the ram axis gear tube (32) and the main shaft (42). The motor shaft (63) can drive a linear gear (68) of a cross slide assembly (24) and thus radially move a tool fixed to the cross slide assembly (24).