Abstract: Provided is an electric actuator (1), including: a motor (10); a motor case (11) configured to accommodates the motor (10); and a motion conversion mechanism (22) configured to convert a rotary motion generated through drive by the motor (10) into a linear motion in a direction parallel to an output shaft (10a) of the motor (10). The motion conversion mechanism (22) includes a movable part (22, which is arranged in parallel with the output shaft (10a) and is configured to perform the linear motion. The movable part (22) and the motor (10) overlap one another in a radial direction of the motor (10). A sensor target (73) is arranged in the moveable part 22, and a non-contact sensor (70) configured to detect a position of the sensor target (73) in a linear motion direction in a non-contact manner is arranged in the motor case (11).

Abstract: A spindle drive assembly for opening and/or closing a vehicle flap is described, having a spindle extending along a spindle drive axis and a spindle drive motor which is drivingly coupled to the spindle via a gearing and the motor shaft of which is arranged substantially coaxially with the spindle drive axis, wherein a coupling compensating an axial offset and a hysteresis brake are drivingly interposed between the spindle drive motor and the gearing. In addition, a vehicle flap with such a spindle drive assembly is presented.

Abstract: An ice breaking seal for a ball screw comprises a first, ice breaking section and a second, sealing section formed integrally with the ice breaking section. The ice breaking section is formed of a polymeric material and has a first hardness. The sealing section is formed of a polymeric material and has a second hardness, which is lower than the first hardness.

Abstract: Disclosed herein is a screw assembly comprising an internal re-circulating path for re-circulating lubricant fluid between a threaded screw shaft and seals provided at the ends of the screw assembly via internal chambers provided within the seals and passages formed within the nut. Also disclosed are seals for use within such assemblies.

Abstract: A ball screw includes a screw having a primary spiral groove. A first nut unit includes a first nut and first balls. The first nut has a first spiral groove. The first balls are located in the first spiral groove and contact the inner surface of the first spiral groove by a first contact angle. A second nut unit includes a second nut and second balls. The second nut has a second spiral groove. The second balls are located in the second spiral groove and contact the inner surface of the second spiral groove by a second contact angle which is different from the first contact angle. When a first wearing trace is formed along the screw by the first balls, the first nut unit is replaced with the second nut unit. A second wearing trace is formed along the screw and not overlapped with the first wearing trace.

Abstract: A screw apparatus with a seal ring is provided which has a reduced number of components and is easy to be assembled. The screw apparatus includes a screw shaft, a nut that includes a through-hole penetrated by the screw shaft and threadedly engages with the screw shaft via a rolling element, seal rings that include holes fitting the shape of a cross-section of the screw shaft, the cross-section being perpendicular to an axis thereof, and prevent the entry of dust into the inside of the nut, and/or prevent the leaking of lubricant in the nut, and a cap attached to the nut, the cap including protrusions fitted into indentations of the seal rings to effect positioning of the seal rings in a circumferential direction, the cap including a step in contact with the seal rings to effect positioning of the seal rings in an axial direction.

Abstract: A ball screw with a dustproof member includes: a screw, a nut and the dustproof member. The dustproof member is inserted along the axis into the annular receiving groove and sleeved onto the screw, and includes an annular first dustproof portion and an arc-shaped second dustproof portion. The annular first dustproof portion includes a dustproof hole for insertion of the screw, the dustproof hole has a dustproof inner surface defining an clearance relative to the circumferential surface of the screw, the arc-shaped second dustproof portion protrudes from the dustproof inner surface, and includes an arc-shaped dustproof section contacting the outer helical groove. Such arrangements provide a dustproof effect and prevent overstress on the screw, consequently decreasing friction resistance, thus making the assembly easier and reducing the required starting torque.

Abstract: A ball screw device or linear motion guide device has a seal member preventing dust and dirt from entering into a movable member of a linear motion guide device and seals out fine dust, dirt or like by surely contacting a seal to a shaft member without providing a large margin to the seal. The seal member includes a body portion mounted to the movable member and a lip portion contacting an outer portion of the shaft member, the lip portion has an oblique surface having an axial section inclining with respect to its axial direction, the body portion has an urging member urging the lip portion in a diameter direction of the shaft member and a reinforcing portion reinforcing the body portion. The urging member is located on the reinforcing portion side than the tip end of the lip portion in the axial sectional shape of the lip portion.

Abstract: Provided is an electric actuator capable of preventing the release of particles from the body thereof. The electric actuator includes a body made of an elongated enclosure; a slider configured to move in a reciprocating manner along a lengthwise direction of the body; an opening formed in a side surface of the body to correspond to a moving path of the slider; a dust seal band provided to cover the opening; and a pair of electrodes protruding from the body at opposite sides of the opening toward the outside of the body and extending in the lengthwise direction of the body with the opening being interposed between the pair of electrodes. Positive potential is generated in the upper electrode of the pair of electrodes and negative potential is generated in the lower electrode of the pair of electrodes.

Abstract: A nut for a ball screw mainly includes a nut, multiple dual-narrowed paths, multiple micro fans, a control portion, and multiple temperature sensing portions. The nut has a threaded path and the dual-narrowed paths are defined through the central axis of the nut and substantially parallel to the threaded path. Each of the dual-narrowed paths has a high-speed area and the diameter of each of the dual-narrowed paths is gradually reduced from two ends toward the high-speed area. The nut has micro fans which drive the air flows and reduce the temperature to increase the life of use and the precision of positioning.

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: A clean environmental actuator is less in weight, height in transverse section and compact in construction, even with ensuring accurate position control and conformable to high speed operation and high acceleration/deceleration. Both a bed and a slider are stowed in an enclosure and packings are in T-slots in side walls of the bed to seal clearances between the bed and the enclosure. The enclosure is composed of an end bracket to cover one end of the bed, a motor bracket to cover another end of the bed, a pair of side coverings to enclose the side surfaces and tops of the side walls of the bed, a sealing panel to cover an upward opening between the side coverings, and a table covering to overlay an area of the sealing panel lying on the slider and side areas of the table bulging out from side edges of the sealing panel.

Abstract: A wiper for a translating ram with recessed features includes a first element conforming to the recessed features of the translating ram; and a second element conforming to the external surface of the translating ram. The first element and second element conform to the cross-section of the translating ram when placed axially adjacent.

Abstract: a ball screw seal assembly which includes at least one energizer and a seal body, the ball screw seal assembly being configured for being positioned in a housing groove, the seal body including at least one outer diameter lip and two inner diameter lips, the at least one outer diameter lip being configured for contacting and optionally sealing against the housing groove, the inner diameter lips being configured for wiping or scraping an outer surface of a threaded rod including a plurality of threads, the inner diameter lips being wipers or scrapers and being spaced apart from one another, the at least one energizer being configured for energizing and thereby biasing each of the inner diameter lips radially inwardly.

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: An electromotive linear drive, in particular for adjusting parts of an item of furniture, having a multi-part housing which is produced from plastic in an injection-molding process and in which are mounted at least one drive train and a block-shaped spindle nut which engages at least partially around the housing and/or at least partially into the housing. The housing is formed from at least two housing parts and has sliding tracks for the spindle nut, wherein at least the thread flights of the spindle are arranged outside the housing. In one preferred embodiment, the housing is arranged below the region of the spindle in relation to the assembled position of the electromotive linear drive. The housing parts forming the housing are of identical or similar, preferably shell-shaped, design in cross section.

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: The invention relates to an electrically driven linear actuator for linearly moving a mass, in which at least one elongated actuator element, which, on the output side, acts upon the mass, is mounted inside a main pipe in a manner that enables it to slide in an axial direction, and which, on the input side, is coupled to a spindle nut that, itself, rests upon a spindle, which is rotationally mounted inside the main pipe and which can be placed in rotational motion by an electric motor.

Abstract: A ball screw device includes a ball nut having a bore for receiving a screw shaft, and having a number of longitudinal channels and compartments for forming a zigzag shaped fluid flowing passage in the ball nut, a number of deflecting members engaged with the compartments of the ball nut and each having a recess for communicating adjacent channels with each other, the outer peripheral surfaces of the deflecting members are tilted relative to the ball nut for allowing the deflecting members to be expanded when the deflecting members are expanded, a cooling agent flows through the zigzag shaped fluid flowing passage for cooling the ball nut and for preventing the ball nut from being overheated.

Abstract: A linear actuator unit has a slide plate which is allowed to freely move along the outer rail while causing a cover to retreat. The linear actuator unit includes: an outer rail, which is formed into a cylindrical shape, and includes the slit-opening portion formed along an axial direction thereof; the slide plate (3), which is coupled to an inner block in the hollow portion through the slit-opening portion; a cover belt, which is tensioned between both ends in a longitudinal direction of the outer rail so as to cover the slit-opening portion; a belt-guiding member, which separates the cover belt from the outer rail correspondingly to movement of the slide plate; and a seal member, which seals between the belt-guiding member and the cover belt and between the belt-guiding member and the outer rail.

Abstract: A linear actuator with a dustproof mechanism provides reliable dustproof capability over the entire stroke of the actuator. A linear actuator 100 with a dustproof mechanism includes a ball screw, a movable stage 4 including a ball screw nut that engages the ball screw, the movable stage capable of making linear reciprocating motion in the axial direction of the ball screw in response to rotary motion of the ball screw, a housing member 2 disposed to cover at least the ball screw, openings 27, 28 formed in the housing member 2 along the path along which the movable stage 4 travels, and dustproof belts 29, 30 disposed inside the housing member 2 to block the openings 27, 28. The linear actuator 100 with a dustproof mechanism further includes end plate covers 105a, 105b that cover both ends of the housing member 2 and hence has high dustproof performance.

Abstract: A chips dischargeable wiper is disposed at the end of a nut, the wiper is defined with a flange, a plurality of ribs integrally formed with the flange, and a plurality of through holes located beside the flange. The flange is used to mate with the helical groove of the ball screw in such a manner that a rib is formed on the flange, which not only can reduce the resistance of the wiper, but also can effectively prevent intrusion of foreign objects into the screw shaft and can prevent leakage of lubricating agent. Furthermore, the rib can collect dusts and the foreign objects and discharge them out of the through holes. Therefore, the structure of wiper is simplified and can be used for a long time without maintenance.

Abstract: A two-lip dust-proof wiper of a ball screw having a main ring body, with a ringed sheet, and a screwed hole, a circumferential portion and first/second flanged portions. A wiping ring surface is set into the hole. Fine interference fit can be implemented between the wiping ring surface and the periphery of the ball screw. A first wiping lip is annularly formed onto the wiping ring surface for mating with the first flanged portion, and a second wiping lip is annularly formed onto the wiping ring surface for mating with the second flanged portion, such that the first/second wiping lips are protruded at both sides of the surface. The wiping lips and the periphery of ball screw are under interference fit, the interference being larger than that of the wiping ring surface and ball screw. The protruding direction of the wiping lips runs parallel with the flanged portions.

Abstract: A ball screw device includes an elongated screw shaft and a ball nut having helical grooves for receiving ball bearing members, a housing is attached to the ball nut and includes a bore for receiving the screw shaft, and includes one or more slots communicative with the bore of the housing, and one or more wiper members are changeably engaged into the slots of the housing and include a wiper element engaged into the bore of the housing for engaging into the groove of the screw shaft and for removing or wiping off the dirt from the helical groove of the screw shaft and for preventing the ball nut and the screw shaft from being damaged by the dirt.

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: An adjusting device for seating and reclining furniture includes a basis case, a screw rotatable axis, a guide area, an adjuster and a side cover. A notching is set at the upper end face of the guide area. A slider inside of the adjuster is combined with the upper wall of a perforating in the guide area by a connection portion. The width of the connection portion is set corresponding to the width of the notching of the guide area, and a perforated panel is set at the center of the connection portion to make a fender board impenetrate. The fender board may shield the notching of the guide area. A chamber is set in the upper end face of the adjuster corresponding to the position of the perforated panel from top to bottom. The chamber may hold a felt containing lubricating oil. There is a bearing chamber in the inner wall of the side cover. The bearing chamber may make the bearings embed in, and a bearing are pivoted and combined with the end of the screw rotatable axis.

Abstract: A ball screw device includes an elongated screw shaft and a ball nut having helical grooves for receiving ball bearing members, a housing is attached to the ball nut and includes a bore for receiving the screw shaft, and includes one or more slots communicative with the bore of the housing, and one or more wiper members are changeably engaged into the slots of the housing and include a wiper element engaged into the bore of the housing for engaging into the groove of the screw shaft and for removing or wiping off the dirt from the helical groove of the screw shaft and for preventing the ball nut and the screw shaft from being damaged by the dirt.

Abstract: The method of the present invention provides a variety of vehicle performance characteristics depending on the mode of operation. A first routine is initiated to provide an optimal balance of powertrain responsiveness and fuel economy for any given combination of vehicle speed and deceleration rate. The first routine may, according to a preferred embodiment, include a plurality of routines that are each configured to provide an optimal balance of powertrain responsiveness and fuel economy within a predefined range of vehicle speeds and deceleration rates. A second routine is initiated if said deceleration rate is within a predefined range. The second routine includes running the electric motor/generator while the hybrid vehicle is being stopped in order to control the driveline lash and thereby minimize disturbances during a subsequent engine re-start.

Abstract: A linear actuator with a dustproof mechanism provides reliable dustproof capability over the entire stroke of the actuator. A linear actuator 100 with a dustproof mechanism includes a ball screw, a movable stage 4 including a ball screw nut that engages the ball screw, the movable stage capable of making linear reciprocating motion in the axial direction of the ball screw in response to rotary motion of the ball screw, a housing member 2 disposed to cover at least the ball screw, openings 27, 28 formed in the housing member 2 along the path along which the movable stage 4 travels, and dustproof belts 29, 30 disposed inside the housing member 2 to block the openings 27, 28. The linear actuator 100 with a dustproof mechanism further includes end plate covers 105a, 105b that cover both ends of the housing member 2 and hence has high dustproof performance.

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 lubricating element for rolling element tracks, particularly linear motion systems, has a body composed of a lubricant-storing material, which includes an application section capable of being brought in contact with a rolling element bearing surface to supply lubricant; the body has an elongated shape in a first storage region adjacent to the application section, and a lubricant flow through the first storage region triggered via the dispensing of lubricant at the application section is essentially oriented in the longitudinal direction of the first storage region.

Abstract: A chips dischargeable wiper is disposed at the end of a nut, the wiper is defined with a flange, a plurality of ribs integrally formed with the flange, and a plurality of through holes located beside the flange. The flange is used to mate with the helical groove of the ball screw in such a manner at least a rib tapered from outside in is disposed between the flange and the screw shaft, which not only can reduce the resistance of the wiper, but also can effectively prevent intrusion of foreign objects into the screw shaft and can prevent leakage of lubricating agent. Furthermore, the rib can collect dusts and the foreign objects and discharge them out of the through holes. Therefore, the structure of wiper is simplified and can be used for a long time without maintenance.

Abstract: A linear actuator for reclining furniture has a rotary motor that can axially displace a nonrotatable inner tube coaxial engaged in an axially fixed and nonrotatable outer tube, with the inner tube projecting axially forward from an end of the outer tube. An inner sleeve coaxially fits around the end of the outer tube and is axially traversed by the inner tube, and an outer sleeve coaxially fits around the inner sleeve, projects axially forward and rearward past the inner sleeve, and ix axially traversed by the inner tube. The outer sleeve has axially forward of the inner sleeve a radially inwardly projecting collar engaged around the inner tube and bearing axially rearwardly on the inner sleeve.

Abstract: A sliding device for use with a variety of machines is reduced in overall length, thereby being compact in construction. The sliding device has a drive train enclosure made airtight and is acceptable for use in a clean environment. The sliding device includes an elongated sliding unit enclosure of airtight construction, a sliding table and a driving motor that is coupled to the drive train enclosure in parallel with the sliding unit enclosure. The drive train enclosure receives a drive train to carry power from the driving motor to the sliding table. The drive train enclosure is mounted with the driving motor while maintaining airtightness.

Abstract: A ball screw unit with dust cleaning and ball deflecting element fixing mechanism includes an annular inlaid slot along the inner surface of a nut proper proximate to the outside of a ball deflecting element. A fixed dust scrape formed of a C shaped annular packing is installed in the annular inlaid slot. The C shaped annular packing is covered with a soft covering layer at its inner fringe and the outer fringe of the soft covering layer is just stuffed in the annular inlaid slot of the nut proper. Inner fringe of the soft covering layer is formed into a spiral scraper blade corresponding to the rolling spiral slot of the screw blot. The fixed dust scraper is tightly fixing the ball deflecting element to the nut proper by means of the resiliency of the soft covering layer to clean the dust along the rolling spiral slot with its spiral scraper blade thereby serving as a dust cleaner.

Abstract: A seal for a ball screw is provided with a foreign material removing member having a hole of a shape corresponding to a sectional shape of a ball screw shaft taken perpendicularly to an axis thereof to prevent a foreign material from invading from an outside of a ball screw nut and a seal member having a hole of a shape corresponding to a sectional shape of the ball screw shaft to retain a lubricant existing inside the ball screw nut. The foreign material removing member and the seal member are mounted to the ball screw shaft, at each of both the axial ends of the nut, while being overlapped to each other in a state that inner peripheral portions of the foreign material removing member and the seal member contact an outer peripheral surface of the ball screw shaft and the ball rolling groove thereof. The foreign material removing member is disposed outside the seal member in the axial direction of the ball screw nut.

Abstract: A seal for a ball screw is provided with a foreign material removing member having a hole of a shape corresponding to a sectional shape of a ball screw shaft taken perpendicularly to an axis thereof to prevent a foreign material from invading from an outside of a ball screw nut and a seal member having a hole of a shape corresponding to a sectional shape of the ball screw shaft to retain a lubricant existing inside the ball screw nut. The foreign material removing member and the seal member are mounted to the ball screw shaft, at each of both the axial ends of the nut, while being overlapped to each other in a state that inner peripheral portions of the foreign material removing member and the seal member contact an outer peripheral surface of the ball screw shaft and the ball rolling groove thereof. The foreign material removing member is disposed outside the seal member in the axial direction of the ball screw nut.

Abstract: A dustproof device for a ball screw disposed on an end surface of a nut comprises: an absorber, an oil scraping piece and a wiping member. The absorber is made of liquid-absorbing material. The oil scraping piece has an oil scraping portion contacting the surface of the screw. The wiping member is formed with a threaded portion for meshing with the surface of the screw. And a plurality of protrusions is formed between the wiping member and the oil scraping piece for defining at least one radial through hole between the wiping member and the oil scraping piece. Therefore, the dustproof device can block and remove powder and liquid, and prevent lubricant leakage out of the nut and can absorb a tiny amount of cutting fluid passing through the oil scraping piece.

Abstract: An actuator that at least inhibits the deleterious effects of corrosive fluids, such as salt-laden air, does not rely on relatively expensive materials. At least a portion of the actuator housing is sealed from the surrounding salt-laden air, and is in fluid communication with an air reservoir that includes a supply of relatively salt-free, or substantially salt-free, air. The actuator is configured to exchange air between the air reservoir and the actuator housing, thereby at least substantially inhibiting the ingress of salt-laden air into much of the actuator.

Abstract: A dust-proof structure for a ball screw comprises: a wiper, a wiping piece and a fastening device. The wiper is a C-shaped structure defined with a gap for accommodation of a wiping piece and is annually mounted on a surface of a screw shaft. The wiper is formed at either side of the gap with a bevel surface, and the wiping piece is also formed at both sides thereof with a bevel surface for mating with the bevel surface of the gap, so that the wiper and the wiping piece are maintained into contact via the bevel surfaces. The fastening device enables the C-shaped wiper to be deformed in radial direction, making the wiping piece abut against the surface of the screw shaft. By such arrangements, an interacting force between the bevel surfaces of the wiping piece and the wiper pushes the wiping piece toward the surface of the screw shaft, thus effectively preventing dust.

Abstract: A ball screw device has a screw shaft which has a shaft rolling groove in a spiral shape formed on an outer surface of the screw shaft, a nut which has a nut rolling groove formed on an inner surface of the nut and opposed to the shaft rolling groove, wherein the screw shaft is to be screwed in the nut so that the shaft rolling groove and the nut rolling groove are faced through a plurality of rolling balls, and a lubrication ring which is made of a lubricant-including material, comes in slide contact with the screw shaft, and is arranged in an end portion of the nut, wherein a non-contact portion, which does not come in slide contact with the screw shaft, is formed on the slide contact surface of the lubrication ring.

Abstract: A hooked dust scraper for ball screw unit includes a plurality of tooth portions and corresponding number of hook portions. It is characterized that the scraper is hooked on the nut of the ball screw unit without employing screw engagement so that the ball screw unit associated with this scraper is easy to fabricate, assemble, and detach thereby saving the production and assembly cost.

Abstract: A ball screw has a screw shaft including a screw groove formed in an outer peripheral surface thereof; a nut including a screw groove formed in an inner peripheral surface thereof and screwed together with the screw shaft through a large number of balls rollably disposed in a spiral-shaped ball rolling passage formed by the two screw grooves; and, two seals respectively disposed on the two end portions of the nut for sealing the opening of a clearance between the screw shaft and the nut, wherein two annular grooves are respectively formed in the inner peripheral surfaces of the two end portions of the nut, each of the seals is formed in a substantially annular-ring shape having an outside diameter larger than the inside diameter of the nut and the seals are mounted into the nut by fitting the outer edge portions of the seals into the annular grooves.

Abstract: In an actuator, displacement resistance in axial movement of a slider is reduced to improve durability and enhance maintainability. At each side of the actuator, a slit is made between a top cover and a side cover. Magnetic bodies are provided on the surfaces of both side walls of the slit which face a fixing block of a slider and a magnetic fluid with a viscosity, surface tension, etc. is held between the magnetic bodies. At each side, the fixing block of the slider axially moves along the slit which is closed by the magnetic bodies.

Abstract: A ball screw mechanism has an opposing thread provided by an integral male thread formed at one end of a nut received on the screw. The male thread is of a smaller form than the female thread on the screw so as to not normally be in contact therewith, but should ay loss of the balls occur with the resultant slight relative axial shift of the screw and nut, the male threads engage to limit such relative axial movement to protect connected equipment. Both the nut male and female threads may be machined from a cylindrical nut blank.

Abstract: A wiper ring to be applied to a nut of a ball screw having a screw shaft comprises a plurality of segments each constituted as independent element having a seal portion to be contacted to the screw shaft, support pins extending in an axial direction of the screw shaft so as to correspond to the segments, respectively, the segments being arranged in a circumferential direction of the screw shaft to be rotatable about the pins, the pins being connected to each other through support members so as to limit the relative movement of the respective pins, and a spring member for urging the segments arranged circumferential direction of the screw shaft so as to be directed towards radially central side of the screw shaft.

Abstract: A seal for a ball screw is provided with a foreign material removing member having a hole of a shape corresponding to a sectional shape of a ball screw shaft taken perpendicularly to an axis thereof to prevent a foreign material from invading from an outside of a ball screw nut and a seal member having a hole of a shape corresponding to a sectional shape of the ball screw shaft to retain a lubricant existing inside the ball screw nut. The foreign material removing member and the seal member are mounted to the ball screw shaft, at each of both the axial ends of the nut, while being overlapped to each other in a state that inner peripheral portions of the foreign material removing member and the seal member contact an outer peripheral surface of the ball screw shaft and the ball rolling groove thereof. The foreign material removing member is disposed outside the seal member in the axial direction of the ball screw nut.

Abstract: An actuator (1) for the linear displacement of a member to be controlled comprising a motor part (2) and an actuating device part (3) including a threaded screw (11) with linear displacement, and a rotary member (9) provided with a threaded portion (10) matching the screw thread, the rotary member capable of being driven in rotation by the motor part and being supported by bearings (15,16) in the form of roller bearing stops with four contact points arranged on either axial side of said threaded portion to guide the rotary member axially and radially. The raceways of the balls are directly in the rotary member and integral with parts of the body (14) or the cover (13) of the actuator.

Abstract: A wiper ring to be applied to a nut of a ball screw having a screw shaft comprises a plurality of segments each constituted as independent element having a seal portion to be contacted to the screw shaft, support pins extending in an axial direction of the screw shaft so as to correspond to the segments, respectively, the segments being arranged in a circumferential direction of the screw shaft to be rotatable about the pins, the pins being connected to each other through support members so as to limit the relative movement of the respective pins, and a spring member for urging the segments arranged circumferential direction of the screw shaft so as to be directed towards radially central side of the screw shaft.

Abstract: A wiper ring to be applied to a nut of a ball screw having a screw shaft comprises a plurality of segments each constituted as independent element having a seal portion to be contacted to the screw shaft, support pins extending in an axial direction of the screw shaft so as to correspond to the segments, respectively, the segments being arranged in a circumferential direction of the screw shaft to be rotatable about the pins, the pins being connected to each other through support members so as to limit the relative movement of the respective pins, and a spring member for urging the segments arranged circumferential direction of the screw shaft so as to be directed towards radially central side of the screw shaft.