Abstract: A driving instrument for adjusting a spinal implant includes an outer shaft having a distal end configured to actuate a proximal adjustment assembly of a spinal implant, and an inner shaft having a distal end configured to actuate a distal adjustment assembly of the spinal implant. The inner shaft is disposed within the outer shaft, with a proximal end of the inner shaft extending proximally from the outer shaft. The proximal end is configured to be rotated such that rotation of the inner shaft results in simultaneous rotation of the inner and outer shafts, with rotation of the outer shaft ceasing at a first value of resistance associated with the proximal adjustment assembly and rotation of the inner shaft ceasing at a second value of resistance associated with the distal adjustment assembly such that cessation of rotation of the inner shaft is independent from cessation of rotation of the outer shaft.

Abstract: A linear actuator includes a screw shaft comprising a screw thread and having a longitudinal axis A, a nut movable along the screw shaft from a retracted position to an extended position, and a plurality of rollers movable with the nut. Each roller includes a cylindrical surface configured to roll along one or more flanks of the screw thread, such that rotation of the screw shaft causes the rollers to roll along the flank(s) so that the nut translates in an axial direction along the screw shaft. The screw thread has a variable lead angle. The actuator can be part of a power door opening system of an aircraft.

Abstract: A ball screw including a threaded spindle and a spindle nut has a ball deflector arranged in an opening in the lateral surface of the spindle nut. The ball deflector is formed with an upper shell and a lower shell, the lower shell being arranged radially inwardly closer to the spindle nut longitudinal axis than the upper shell. The lower shell has a substantially half-shell-shaped contour. Both the upper shell and the lower shell are fastened in the spindle nut without any further, discrete mechanical fastening elements, and the ball deflector formed thereby does not protrude beyond the outer contour defined by the spindle nut.

Abstract: A ball screw includes a screw, a nut, a plurality of balls and a ball return path. A spiral screw groove is formed on an outer peripheral surface of the screw shaft. The nut is disposed around the screw shaft. A spiral screw groove is formed on an inner peripheral surface of the nut. The balls are housed in rolling paths formed by the two screw grooves facing each other. The ball return path circulates the balls in no more than one turn of the rolling paths. A length of the ball return path between scoop-up points where the balls are scooped up from the screw groove of the screw shaft is set to a value which is from ?0.1 to +0.3 times of a diameter of the balls with respect to an integer value of a number of the balls filled between the scoop-up points.

Abstract: A ball screw device includes a screw shaft having a first screw groove formed on an outer circumference thereof, a ball screw nut having a second screw groove formed on an inner circumference thereof, and a plurality of balls disposed in a spiral ball raceway wherein the first screw groove and the second screw groove face each other. A circulation member is attached to an attachment hole radially penetrating the ball screw nut and a circulation path is formed, the circulation path allowing endless circulation of each of the balls rolling in the ball raceway by short-circuiting between two points of the ball raceway.

Abstract: A cable cylinder (100) comprising a frame (1);—a pin (2) mounted on the frame and extending along a first axis (Oy);—a nut (4) engaging with the pin (2);—a first cable (10) coupled to the nut or the pin (2) and intended to be functionally connected to an element to be moved;—a motor (3) designed to rotate the pin (2) or the nut (4); characterised in that the first cable (6) comprises at least a first section (6.1) extending substantially parallel to the first axis (Ox), and the first cable (6) is designed to exert opposing forces on rotation of the nut (4) by the pin (2) or of the pin (2) by the nut (4) in order to constitute anti-rotation means so that a rotation of the pin (2) or of the bolt (4) under the action of the motor (3) causes a relative movement of the nut (4) and of the pin (2).

Abstract: A solar tracking system is provided and includes a solar array, a plurality of support beams configured to support the solar array, a torque tube coupled to the plurality of support beams, a base configured to rotatably support the torque tube, and an articulation system configured to rotate the torque tube relative to the base. The articulation system includes a first helical tube coupled to the torque tube, a first helical tube support disposed on the base and configured to slidably support the first helical tube, and a gearbox in mechanical communication with the first helical tube. Actuation of the gearbox causes the first helical tube to translate within the first helical tube support and the first helical tube support is configured to rotate the first helical tube as the first helical tube is translated therein to cause a corresponding rotation of the solar array.

Abstract: A driving instrument for adjusting a spinal implant includes an outer shaft having a distal end configured to actuate a proximal adjustment assembly of a spinal implant, and an inner shaft having a distal end configured to actuate a distal adjustment assembly of the spinal implant. The inner shaft is disposed within the outer shaft, with a proximal end of the inner shaft extending proximally from the outer shaft. The proximal end is configured to be rotated such that rotation of the inner shaft results in simultaneous rotation of the inner and outer shafts, with rotation of the outer shaft ceasing at a first value of resistance associated with the proximal adjustment assembly and rotation of the inner shaft ceasing at a second value of resistance associated with the distal adjustment assembly such that cessation of rotation of the inner shaft is independent from cessation of rotation of the outer shaft.

Abstract: A spinal implant has a proximal region and a distal region, and includes an upper body and a lower body each having inner surfaces disposed in opposed relation relative to each other. A proximal adjustment assembly is disposed between the upper and lower bodies at the proximal region of the spinal implant and is adjustably coupled to the upper and lower bodies, and a distal adjustment assembly is disposed between the upper and lower bodies at the distal region of the spinal implant and is adjustably coupled to the upper and lower bodies. The proximal and distal adjustment assemblies are independently movable with respect to each other to change a vertical height of at least one of the proximal region or the distal region of the spinal implant.

Abstract: A stand-alone expandable interbody spinal fusion device including a superior component, an inferior component, an expansion mechanism arranged to displace the superior component in a first direction relative to the inferior component, and a self-piercing screw mechanism arranged within the superior component or inferior component. When torque is applied to the expansion mechanism, torque is transferred 90 degrees thereby displacing a threaded rod or toothed shaft in a first direction thereby displacing the superior component in a first direction relative to the inferior component. When torque is applied to the self-piercing screw mechanism, torque is transferred 90 degrees thereby displacing a self-piercing screw body in a first direction to engage an anchor layer and the bone material of vertebrae thereby holding the interbody spinal fusion device it in place within a disc space.

Abstract: A screw nut on which a pulley is mounted is capable of promoting reductions in the size and weight thereof. The screw nut includes: an outer ring; and a nut rotatably assembled to the outer ring via a first rolling element. The nut includes: a nut body having a screw groove in an inner surface thereof; and a recirculation component provided at an end portion of the nut body in an axial direction, the recirculation component having a turn-around path for recirculating a second rolling element rolling along a screw groove. A pulley to be mounted on the nut is fitted on an outer surface of the nut body, and is brought into contact with an end surface of the nut in the axial direction. The pulley is mounted on the end surface of the nut with a fastening member.

Abstract: An O-ring and a conveyance apparatus are provided. The O-ring includes an O-ring body having an annular shape. The O-ring further includes a plurality of protrusions arranged at intervals on an outer annular surface of the O-ring body and configured to support a glass substrate and convey the glass substrate as the O-ring body rotates, so that a total area of contact between the glass substrate and the O-ring is reduced, thereby reducing a print area. In addition, after the protrusions and the glass substrate come into contact, contact marks are in a discontinuous state or, in other words, are in a spaced state, and prints are also discontinuous or spaced prints, thereby mitigating visual effects of the prints, and eliminating the prints at low costs.

Abstract: A method of manufacturing a bridge-type ball screw (1) with a bridge member (5) fit into a nut bridge window (6). The bridge member (5) has a linking groove (5a) with a rolling track that acts as a circulating path. After the bridge member (5) is fit into the nut bridge window (6), a cylindrical mandrel (8), with projections (9), is inserted into the nut (3). An upper die (10) restricts the upper surface of the bridge member (5) and is lowered while the nut (3) is held between the upper die (10) and the mandrel (8). A connection part is subject to plastic working by the projections (9) of the mandrel (8). The bridge member (5) is simultaneously deformed by the upper die (10) to secure the bridge member (5) into the nut bridge window (6).

Abstract: A ball screw nut having a tubular sheet metal body with a thread profile and being optionally encapsulated in plastic. This sheet metal body is formed of a sheet metal part that includes the thread profile and a ball-returning piece inserted therein, which is designed as an additional sheet metal part.

Abstract: A mechanical linear actuator in an aircraft brake may include a ball nut, a ball screw, and an actuator drive unit housing. The ball screw may rotate to drive the ball nut axially. The ball screw and the actuator drive unit housing may form a series of annular raceways. The ball screw may have a first window corresponding to a first raceway and a second window corresponding to a second raceway. Balls may be inserted into the first raceway through the first window and into the second raceway through the second window.

Abstract: To provide an actuator with which side face covers can be easily attached and detached without damaging a top face cover, and workability is enhanced, and cost can be reduced without upsizing the actuator, by fastening and fixing the actuator to a base stand from above the actuator in a state in which the side face covers are removed.

Abstract: A ball screw (1) having a threaded nut (3) arranged on the threaded shaft (2) and a ball channel (4) wound about the longitudinal axis of the threaded shaft (2), and in which the balls (5) and at least one helical spring (6) are received. This helical spring (6) is supported on a molded part (7) which is inserted into a recess (8) of the threaded nut (3) and closes the recess (8).

Abstract: Double nut is capable of adjustment in a ball screw unit so as to regulate tension between the nut and the ball screw with their ball bearings such as to avoid or repair backlash in or maintain precision with the unit. The adjustment may be made without removal of the ball screw unit from a machine in which it operates or automatically. The double nut can be employed with or in methods of making, repair or adjustment of, and manufacturing with the ball screw unit with such a nut. A wiping contrivance for a ball screw nut or unit can be a member in annular form, and made and used in aspects analogous to those of the double nut. A depending foot, ball bearing return may be employed in a ball screw nut or unit in aspects analogous to those of the double nut.

Abstract: A linear device is provided which can greatly reduce an amount of leakage of fine particles that are produced between a rolling element raceway and rolling elements to the outside of the device and which is therefore suitable for a semiconductor production apparatus or liquid crystal display panel production apparatus or other clean environment. In a linear device, each of a pair of seal members is formed to a shape which has a clearance of 0.025 to 0.15 mm in range with respect to a raceway member when cut along a direction perpendicular to the axial direction of the raceway member in a state attached to a moving member. Grease with a worked penetration of 175 to 250 is coated between the rolling element raceway and the rolling elements.

Abstract: A ball-screw assembly isolator is provided, and includes a housing; a ball-screw, a bearing assembly, a retaining member, a first compressible member and a second compressible member. The bearing assembly is located between the housing and the ball-screw. The bearing assembly includes an outer race. The retaining member is secured by the housing. The first compressible member is positioned between the housing and the outer race. The second compressible member is positioned between the outer race and the retaining member. The retaining member is configured to be preloaded to exert an axial force upon the first compressible member and the second compressible member.

Abstract: A ball screw including: a male component having male grooves on an outer periphery for a ball to roll; a female component fitted together with the male component in an axial direction having female grooves facing the male grooves on an inner periphery for the ball to roll and a circulation path for the ball to circulate; and a seal member at one end, at the other end, or at each of one and the other ends of the female component in the axial direction and including a hole capable of communicating with the inner periphery, a fiber layer having a fitting surface having a convex part capable of being fitted in the male grooves when the male component is inserted into the hole and a surface made of fibers impregnated with rubber or resin, and a rubber or resin layer laminated on a surface opposite to the fitting surface.

Abstract: A ball screw capable of sensing a torque in real time includes a screw rod, a screw nut sleeved onto the screw rod, a plurality of balls mounted between the screw rod and the screw nut, and a torque sensor haying a first fastening portion and a second fastening portion. The first fastening portion is fixed to a working bench and the second fastening portion is fixed to the screw nut, so the torque sensor can sense how much the torque is while the screw out is driving a working bench to move. In light of this structure, monitoring the voltage value outputted by the torque sensor can sense the torque generated while the working screw rod is working.

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: A rotating member has a body, an axle and multiple balls. The body has an outer surface, a spiral groove and a communicating channel. The spiral groove is defined in the outer surface of the body. The communicating channel is defined in the body and communicates with the spiral groove to form at least one recycling path in the body. The axle extends through the body. The balls are mounted in the spiral groove and are moveable along the at least one recycling path. Accordingly, the smoothness of the movement of the rotating member is improved.

Abstract: A ball screw device has a plurality of spiral raceways. One end and the other end of each raceway is connected via a bridge. An annular flange of a ball nut has a plurality of mounting portions at equal intervals in a circumferential direction. A fixing screw is fitted to each mounting portion. The bridges arranged so as to overlap with the annular flange in position in an axial direction are arranged at positions different in the circumferential direction from positions at which the mounting portions are arranged, and are arranged at unequal intervals in the circumferential direction.

Abstract: A motion transmission module with a cooling device is aimed at solving the disadvantage of the conventional motion transmission module that the cooling structure of the conventional motion transmission module would increase the length or outer diameter of the nut. The nut is formed with a flat surface for mounting the cooling device, so that the length of the nut won't be increased. Furthermore, the cooling device also serves as a positioning block to fix the return member, it doesn't increase the outer diameter of the nut.

Abstract: Disclosed is a ball screw module including a screw shaft, a nut member, a ball connector, and a circulating device mounted on the nut member. A helical rolling track is formed between the screw shaft and the nut member. The circulating device is in communication with the helical rolling track and has a circulating route. The circulating route includes an intermediate route, two connecting routes connecting the intermediate route, and two guiding sidewalls formed at sides of the circulating route. The guiding sidewalls guide the ball connector to twist in a clockwise direction while the ball connector entering and leaving the intermediate route and guide the ball connector to twist in a counterclockwise direction while the ball connector passing the intermediate route.

Abstract: A linear ball screw assembly and method of construction thereof is provided. The assembly includes a screw having a helical external groove and a ball nut having a through bore configured for receipt of the screw therethrough and including a helical internal groove radially aligned with the external groove of the screw to form a helical raceway. A plurality of axial load balls are disposed in the helical raceway. The nut includes a pair of non-grooved internal cylindrical surfaces extending in axially opposite directions from the internal groove along the external groove of the screw to provide outer surfaces of a pair of radial load raceways. A plurality of radial load balls are disposed in the radial load raceways. The radial and axial load balls have different diameters and/or the internal cylindrical surfaces are provided by a pair of sleeve inserts.

Abstract: A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.

Abstract: A flat surface portion is formed on a nut so as to extend to a region where an output pulley attachment portion is formed in an axial direction, and extend substantially in parallel with a tangential direction of a rotational axis of the nut. A ball circulation groove one end side opening, and a ball circulation groove opposite end side opening are formed on the nut. The ball circulation groove one end side opening is in communication with one end of a ball circulation groove and is formed so as to be opened to the flat surface portion in the region where the output pulley attachment portion is formed. The ball circulation groove opposite end side opening is in communication with an opposite end of the ball circulation groove and is formed so as to be opened to the flat surface portion.

Abstract: An electromechanical actuator (“EMA”) may comprise a ball screw having at least one tab extending from an inner surface thereof and/or an actuator drive unit (“ADU”) housing that interfaces with the at least one tab. The bail screw may include three tabs extending from the inner surface thereof. An outer surface of the ball screw may be threaded to mate with a threaded portion of an inner surface of the ADU housing, and/or the ADU housing may interface with the at least one tab, and the ball screw may be rotated to translate a ball nut situated concentrically over ball screw axially. The ADU housing may include a gear train assembly having a carrier plate, wherein the carrier plate includes at least one receptacle.

Abstract: The rolling element screw device includes: a screw shaft having a rolling element raceway groove; a nut member, which has a loaded rolling element raceway groove opposed to the rolling element raceway groove and is threadingly engaged with the screw shaft through intermediation of the rolling elements; and the circulation component, which includes a pair of the first circulating portions passing through a peripheral wall of the nut member, and the second circulating portion coupling the pair of first circulating portions together, to thereby form the endless circulation path for the rolling elements. Each of the first circulating portions includes a first cylindrical portion fitted into a circulation component mounting hole of the nut member, and a second cylindrical portion which has an outer diameter larger than an outer diameter of the first cylindrical portion. The first cylindrical portion includes a rolling element introducing hole.

Abstract: A wiper for screwing on a rolling groove of a screw shaft includes a ring and a plurality of wiping protrusions extended from the inner surface of the ring. The ring has a plurality of dust discharge grooves formed on an inner surface thereof. The inner surface of the ring substantially configured to abut an outer surface of the screw shaft. Each wiping protrusion is arranged between any two adjacent dust discharge grooves. When the wiper screws on the rolling groove of the screw shaft, the wiping protrusions are arranged in and compressed by the rolling groove of the screw shaft, and a portion of the rolling groove touched with the wiping protrusions is arranged in a single pitch of the screw shaft. The instant disclosure also provides a ball screw assembly.

Abstract: A combined electromechanical vehicle brake has a hydraulically activated operating brake and an electromechanically activated parking brake apparatus. A hydraulic operating pressure chamber in a brake housing is delimited by a brake piston that can be loaded by hydraulic pressure to carry out operating braking actions. The brake piston can be activated along a longitudinal piston axis to achieve a braking effect. The parking brake apparatus acts upon the brake piston by a gear unit because the gear unit converts the rotational movement of an electromechanical actuator into a translational movement, causing the brake piston to be activated to carry out parking brake processes and remain in the activated position. The gear unit has a threaded spindle and a threaded nut that contact one another via a plurality of rolling elements. A spring element allows the rolling elements to slip when the gear unit is activated in the unloaded state.

Abstract: A ball screw device includes a screw engaged into a nut member for forming two or more endless ball guiding passages and for receiving a number of ball bearing members, the nut member includes two or more conduits and recesses communicative with the helical grooves of the nut member, two deflecting devices are attached to end portions of the nut member and each include an inner member attached to the nut member and having two or more pathways aligned with the recesses of the nut member, and an outer member attached to the inner member and coupled to the inner member with one or more radially extended protrusions for suitably guiding ball bearing members.

Abstract: A return passage that connects two points of a rolling passage to allow each ball that rolls in the rolling passage to endlessly circulate is formed in a ball screw nut by attaching a circulation member to fitting holes. A protrusion is formed on an outer surface of the circulation member at a position offset from a raceway of the balls that circulate in the return passage. The circulation member is fixed to the ball screw nut when the protrusion contacts an inner periphery of an inner ring of a second bearing.

Abstract: Ball screw comprising a ball nut (1), which is rotatably mounted on a threaded shaft and on the inner circumference of which at least one ball thread (2) wound around an axis (8) in a coil shape is provided for balls (3) to roll on, wherein at least one recirculating element (5), which is arranged on the outer circumference of the ball nut (1) and which is provided with a recirculating channel for the balls (3), connects a start of a coil to an end of a coil of the ball thread by means of the two ends of the recirculating element in order to enable endless recirculation of the balls (3), wherein the ball nut (1) is provided with a flange (6) for fastening a belt pulley (15) and with a bearing seat (9), and a sleeve (12) pushed onto the ball nut is provided with a perfectly cylindrical outer circumferential surface, which outer circumferential surface secures the recirculating element (5) on the ball nut (1) and surrounds the ball nut (1) in a tubular shape between the flange (6) and the bearing seat (9).

Abstract: A ball screw with a circulating assembly is disclosed. The circulating assembly of the ball screw is divided into a first circulating block and a second circulating block and can be assembled on the ball screw in such a method that the first and the second circulating blocks are assembled separately, so that the circulating assembly is applicable to the screw shaft whose helical groove doesn't extend to the shoulder portion thereof. In addition, the circulating assembly is limited in terms of an angle, and the relation between the first circulating block and the second circulating block is especially limited, so that the ball screw is applicable to the nuts with smaller outer diameter. Hence, the ball screw can be applied to both the nuts with smaller diameter and the screw shafts whose helical groove doesn't extend to the shoulder portion thereof.

Abstract: A ball screw device includes a screw engaged into a nut member for forming an endless ball guiding passage and for receiving bearing members, the nut member includes a thickness reduced barrel for forming a peripheral surface in the nut member, a tubular member is engaged onto the barrel of the nut member, a number of bearing elements are engaged onto the nut member and the tubular member, a sleeve is engaged onto the nut member and includes an inner peripheral protrusion having two curved side surfaces for engaging with the bearing elements and for solidly and stably anchoring and retaining the bearing elements between the sleeve and the tubular member and the nut member.

Abstract: A linear actuator that does not require a high assembly precision is provided. A linear actuator includes a motor portion including a rotary shaft, a rotor, and a stator, a first bearing portion that supports a first end of the rotary shaft, a locknut threadably engaged on the first end of the rotary shaft, and a ball screw mechanism including a ball screw nut screwed to the locknut and a ball screw threadably engaged with the ball screw nut. Gaps formed between an outer peripheral portion of the rotary shaft and an inner peripheral portion of the locknut, except a male thread portion formed on the rotary shaft and a female thread portion formed on the locknut threadably engaged with each other, are defined to have respective predetermined sizes.

Abstract: A linear motion assembly includes a screw having a helical external groove extending over a plurality of turns with a radially outwardly extending helical land formed between adjacent turns and a ball nut having a through bore configured for receipt of the screw. The ball nut has a helical internal groove extending over a plurality of turns with a radially inwardly extending helical land formed between adjacent turns. The helical land of the ball nut is radially aligned with the external groove of the screw and the helical land of the screw is radially aligned with the internal groove of the ball nut. At least one helical recirculation insert having a circuitous recirculation groove is configured in radial alignment with the radially inwardly extending helical land of the ball nut and the external groove of the screw, wherein a plurality of balls are received in the circuitous recirculation groove.

Abstract: A ball screw apparatus is provided which is less likely to increase dynamic friction torque even when a nut is contracted by cooling, and in which cooling effect is made as high as possible and which does not invite excessive machining efficiency droop and increase in pressure loss. The ball screw apparatus includes a screw shaft, a nut screwed with the screw shaft via a plurality of balls, and a cooling section cooling the nut. The plurality of balls to which preload is applied in a two-point contact state, with a preload direction as a tensile direction, are disposed between a screw groove of the screw shaft and a screw groove of the nut. Or, a ratio of the axial length L of the through hole axially formed in the nut and the diameter D of the through hole axially formed in the nut is given by an equation “10?L/D?60”.

Abstract: This invention is revises the cap nut which the custom knows to suppose it to install trough's outline, will cause to install the dadoing to lead (lead angle to be small) lowly or on two above trundle ditch cap nut will not have the broken tooth's question, when will process should install the trough, only need use the face cutter then to process the forming, will reduce the production cost; And return circuit of this invention all establishes in the backflow part, therefore may promote and the cap nut supposes the backflow hole and the load way grade of fit, causes to roll the moving parts movement to be smoother, and reduces the noise production.

Abstract: A ball screw with a dust-proof and lubricating device comprises: a screw, a nut, a plurality of balls, an oil-absorbing member, a return unit, and two dust-proof members. The nut includes an axial oil-guiding hole, a plurality of radial oil holes in communication with the oil-guiding hole and the helical groove of the nut, and an oil-feeding hole in communication with one of the radial oil holes. The oil-absorbing member is disposed in the oil-guiding hole and the radial oil holes. The return unit is disposed in the nut to enable the turning and circulation of the balls. The two dust-proof members are located at both ends of the axial hole. The ball screw can still be lubricated when it is disposed in a vertical position, and the dust-proof and lubricating device which won't add axial length to the nut.

Abstract: A fitting recess portion that connects fitting holes to each other is formed in a peripheral face of a ball screw nut. A circulation member includes a pair of fitted portions that are fitted in the fitting holes, and a connecting portion that provides communication between the fitted portions. A communication groove that has an opening on the fitted end side of the connecting portion and that extends in the axial direction is formed in the connecting portion. When the connecting portion is fitted in the fitting recess portion and the opening of the communication groove formed in the connecting portion is blocked by a bottom portion of the fitting recess portion, a second path that forms a return path together with first paths formed in the fitted portions is formed.

Abstract: In a ball screw apparatus according to the present invention, a ball guide path 19 for guiding a ball 15 scooped up in a tangential direction of a ball center track circle to a ball return path 17 is formed between a ball guide face 182 of a ball circulating member 18 and a ball guide path forming face 20 that is provided at a nut 12. Accordingly, it is possible to provide a ball screw apparatus capable of scooping up a ball in a tangential direction of a ball center track circle to circulate without reducing a diameter of the ball even when a groove interval of a ball screw groove is narrow or when the ball screw groove is a multistreak screw groove.

Abstract: A rolling device having high silencing effect and requiring no positional alignment working to the seal is provided. The rolling device includes an inner member, an outer member and a number of rolling members disposed between these inner and outer members to thereby allow the outer member to carry out relative rotational motion with respect to the inner member. In such rolling device, an end plate 24 is mounted to each end portion of the outer member. This end plate 24 is provided with an end plate body 24a, a packing member 24c disposed on an abutting surface to the outer member and a seal member 24b slidably contacting the inner member with substantially no clearance. The end plate body 24a, the packing member 24c and the seal member 24b are integrally formed.

Abstract: A ballscrew assembly may comprise a ballscrew having an axially distributed ballscrew groove about an interior circumference of the ballscrew, an extended top plate having an axially distributed extended top plate groove disposed on an outer circumference of the extended top plate, and an axially distributed thrust bearing. Further, a ballnut assembly may comprise a ballnut having an axially distributed ballnut groove about an interior circumference of the ballnut, an extended top plate having an axially distributed extended top plate groove disposed on an outer circumference of the extended top plate, and an axially distributed thrust bearing. Further still, a ballnut assembly may comprise a ballnut having an axially distributed ballnut groove about an outer circumference of the ballnut, an extended top plate having an axially distributed extended top plate groove disposed on an interior circumference of the extended top plate and an axially distributed thrust bearing.

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 ball-screw spline includes: a screw shaft; a ball-screw nut engaged with the screw shaft via balls; and a spline nut assembled to an outside of the ball-screw nut via balls to reciprocate in an axial direction of the ball-screw nut. The ball-screw nut includes a screw portion and an extended portion formed integrally, with the same outer diameter. The screw portion has an inner peripheral surface including a load-rolling groove forming a load path for the balls together with a ball rolling groove on the screw shaft side; and a ball return path coupling adjacent valley portions of the load-rolling groove to form a circulation path corresponding to one loop around the screw shaft. The ball-screw nut has an outer peripheral surface including a ball rolling groove for the spline nut, the ball rolling groove being formed over a range corresponding to the screw portion and the extended portion.