Abstract: A ball nut has at least one internal bearing race with a first end and second end, and at least one recirculating crossover passage for connecting the first end with the second end of the bearing race to form a continuous recirculating path for a plurality of ball bearings. A method for producing a ball nut includes the steps of forming at least a portion of the ball nut body with a helix passage for receiving a plurality of ball bearings, forming a crossover passage in communication with the helix passage for returning the plurality of ball bearings to an opposite end of the helix passage, and assembling the ball nut body portions to position the helix passage and operable orientation with respect to the crossover passage to define at least one raceway having a single recirculating rotational path for receiving the plurality of ball bearings. The ball nut body can be formed by being drawn, coined, metal injection molded, roll formed, through rolled, stamped and/or overmolded.

Abstract: The invention provides a ball screw device having high strength against a repetitive load and improved durability, which is assembled in an electric actuator, by absorbing a bending force by a simple method and making loads in the axial direction uniformly act on balls constructing the ball screw device. In the ball screw device, a ball nut is slid in the axial direction by rotation of a ball screw shaft to convert rotational motion of a motor to linear motion. An outer peripheral surface of the ball screw shaft and an inner peripheral surface of the ball nut are made in contact with each other, balls are disposed between the ball screw shaft and the ball nut, and openings at both ends of a circulating tube for circulating the balls in the device are disposed so as to be off from heavy load regions in which a load heavier than loads in other portions among loads acting on the balls is applied, thereby absorbing a bending force applied to the ball screw device.

Abstract: A ball-nut assembly includes a ball nut and a crossover member. The ball nut incudes a radial through slot and an outer surface. The outer surface has a first portion, has a ledge radially recessed from the first portion and at least partially bounding the through slot, and has an undercut wall connecting the ledge and the first portion. The crossover member has a flange and a crossover-grooved portion. A method for making a ball-nut assembly positions the crossover member from outside the ball nut to have the flange supported by the ledge and the crossover-grooved portion located in the through slot. The method also deforms the flange creating a staked portion of the flange which contacts the undercut wall of the outer surface of the ball nut.

Abstract: The invention relates to a ball screw device in which a screw shaft and a nut member are threadedly engaged with each other through a number of balls. In such a ball screw device, an inner surface of a cover plate contacting an end surface of a nut main body is provided with a projecting return piece adapted to be fit-engaged with a recess cut in an inner peripheral surface of the nut main body, the return piece being provided with a scoop portion for dislodging the balls from the ball rolling groove of the screw shaft and a direction switching passage for guiding the dislodged balls to the entrance of a ball return hole. The projecting return piece is divided into a first piece formed integral with the cover plate and a second piece fixed to the first piece by a curved plane including the center line of the direction switching passage.

Abstract: In a ball groove profile of a ball screw, an outer diameter portion of a screw shaft of the ball screw and a substantially semi-circular ball rolling portion of a ball groove of the ball screw are connected to each other through arcuate portions. The radius of curvature of each arcuate portion ranges from a value half a radius of a rolling ball or more to twice the radius of the ball or less. The arcuate portions are connected at least to the ball rolling portion continuously and smoothly. The ball groove profile can reduce the stress concentration even if impact derived from the collision of the ball is applied to land shoulder portions of the screw shaft, so that the land shoulder portions are not damaged under high-speed operation.

Abstract: The invention relates to a steering servo for motor vehicles, with a drive unit arranged coaxially with the rack arrangement, which comprises a combination of a tubular electrical motor (9, 10, 12), with a recirculating-ball spindle drive. A particularly compact and cost-effective steering servo arrangement with few components is permitted, whereby the ball nut (7) of the recirculating-ball drive is mounted coincidentally with the rotor (9), which is arranged as an external rotor.

Abstract: The invention concerns a ball screw-nut device comprising a screw (2) and a nut (3), the nut including a housing (7) and a ball-bearing element (4) comprising a raceway (13) and a plurality of balls (15), the ball-bearing element (4) being produced as an independent part which assembled with the housing.

Abstract: An internal recirculating ball screw and nut system that is easier to manufacture and more reliant by virtue of a particular configuration of the grooves on the interior of the nut or the follower. Crossback portions of select nut grooves are arranged in a manner that allows the bearing balls to recirculate by slipping over the top of adjacent thread lands of the screw, advancing and recirculating within a single 360 degree rotation within said nut. Said recirculation is accomplished solely through the design of the path of a unitary nut, without use of any ancillary devices.

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 ball screw which is little subject to deterioration of operating characteristics and occurrence of wear, torque change, noise, vibration, etc. during operation due to stagnation or competition of balls. The ball screw includes a screw shaft having a helical thread groove formed on the outer surface thereof and a nut having a thread groove formed on the inner surface thereof corresponding to the thread groove on the screw shaft which engages with the screw shaft with the interposition of a number of balls rollably provided in a helical ball rolling path formed between the two thread grooves, wherein the variation of the total of the gap between the balls during the rolling of the balls is smaller than {fraction (1/20)} of the diameter of the ball.

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 clutch operator arrangement for introducing an actuating force into a friction clutch includes a ball screw arrangement.

Abstract: There is provided a return pipe type ball screw capable of accurately positioning and fixing return pipes on and to a nut member even when a troublesome positioning operation is not carried out, and circulating balls endlessly and smoothly for a long period of time without the possibility that dust enters the interior of the nut member. In such a ball screw, ball passing holes formed so as to extend through the nut member are inclined at an angle equal to a lead angle of a ball rolling groove of a screw shaft, and each of the return pipes is formed by combining together a pair of return pieces adapted to be fitted in the ball passing holes.

Abstract: An internal recirculating ball screw and nut system that is easier to manufacture and more reliant by virtue of a particular configuration of the grooves on the interior of the nut or the follower. Crossback portions of select nut grooves are arranged in a manner that allows the bearing balls to recirculate by slipping over the top of adjacent thread lands of the screw, advancing and recirculating within a single 360 degree rotation within said nut. Said recirculation is accomplished solely through the design of the path of a unitary nut, without use of any ancillary devices.

Abstract: A horizontal stabilizer actuator for a winged aircraft which is selectively pivotally controlled by a pilot or operator at a remote location in the aircraft and which has a primary load path responsive to the selective control by the pilot or operator for setting the pivoted position of the stabilizer and which has a secondary load path which is responsive to a failure in the primary load path to be automatically actuated to a condition locking the stabilizer in a fixed position.

Abstract: Ball screw nut is composed of an inner threaded nipple and an outer housing. The nipple is constructed with a hollow hard tubular metallic material to ensure the strength of the structure; while the outer housing where requires less strength is formed of a plastic material by ejection mold process so as to reduce the production cost and simplify the fabrication process. The nipple and the housing are conjoined together by screw engagement.

Abstract: The invention provides a ball screw which is little subject to deterioration of operating characteristics and occurrence of wear, torque change, noise, vibration, etc. during operation due to stagnation or competition of balls. A ball screw comprising a screw shaft having a helical thread groove formed on the outer surface thereof and a nut having a thread groove formed on the inner surface thereof corresponding to the thread groove on the screw shaft which engages with the screw shaft with the interposition of a number of balls rollably provided in a helical ball rolling path formed between the two thread grooves, wherein the variation of the total of the gap between said balls during the rolling of the balls is smaller than {fraction (1/20)} of the diameter of the ball.

Abstract: A ball screw apparatus, has a screw shaft including a screw groove; a nut fitted with the screw shaft, the nut including a screw groove and a ball return passage; a circulation piece including a ball circulation passage; and, a large number of balls, wherein, in the inner peripheral surface of the nut, a concave-shaped snap ring groove extending along the peripheral direction of the nut is formed, in the face of the circulation piece that faces the inside diameter side of the nut, a concave-shaped snap ring groove is formed so as to connect to the snap ring groove of the nut, and an outside diameter portion of a snap ring is fitted into the two snap ring grooves to thereby fix the circulation piece to the nut.

Abstract: A ball screw has a screw shaft including a spiral-shaped ball rolling groove formed in an outer peripheral surface thereof; a nut including a spiral-shaped ball rolling groove formed in an inner peripheral surface thereof; a plurality of balls disposed in a raceway formed by the two rolling grooves; and, a return path for moving the balls from the terminal point of the raceway to the start point of the raceway, the two end portions of the return path respectively including a rising surface rising from the ball rolling groove of the nut and a stopper portion disposed opposed to the rising surface to form the end portion of the raceway, wherein a boundary portion between the rising surface and the ball rolling groove of the nut is formed a round portion having the radius of curvature 0.05 times the diameter of the ball or more.

Abstract: Ball screw drive including threaded spindle and threaded nut body. Nut body is axially displaceable on spindle, and threaded grooves of the spindle and the nut body are arranged to form load-bearing ball channel. Return channel is provided, as is plurality of balls for movement through load-bearing ball channel and return channel. Return channel is structured so that balls moving through return channel are not under stress. At least one of spindle and nut body have at least one additional groove parallel to load-bearing channel, and return channel includes the additional groove. End caps arranged at opposite ends of nut body are structured and arranged to transfer balls from load-bearing ball channel to return channel and from return channel to load-bearing ball channel. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: A projection 5 is formed in ring shape at a side facing outside of a circular arc face 3 at the front end portion of a sealing lip L, the projection being to contact a frank face in a progressing side of the screw shaft. If the seal for ball screw is attached to the nut end portion, rigidity effecting along the lip thickness is reinforced by the projection 5, to subsequently prevent turnover easily happening hitherto in a steeply oblique part of the frank face of a progressing side. At this steeply oblique part, a double sealing function is exhibited by contacting the circular arc face 3 at the front end portion of the sealing lip L and the projection 5 at the side facing outside to this part.

Abstract: Ball screw with long duration and reduced noisiness, in particular for aerospace and industrial applications, comprising load-bearing balls made of ceramic material alternating, one by one, with spacer balls made of material having low volume mass, no greater than 3 g/cm3, and having a smaller diameter than that of the load-bearing balls.

Abstract: A linear guide apparatus includes a slider, a guide rail opposing the slider with a clearance provided therebetween, a plurality of rolling elements which are rotatably interposed there between, and a contact seal device for sealing an opening of the clearance. A side seal member of the contact seal device is made of a rubber material composition containing fluoro rubber. The rubber basically comprises at least one of copolymers that are vinylidenefluoride-tetrafluoroethylene-polypropylene terpolymer and tetrafluoroethylene-polypropylene copolymer.

Abstract: A ball-nut assembly includes a ball nut and a crossover member. The ball nut incudes a radial through slot and an outer surface. The outer surface has a first portion, has a ledge radially recessed from the first portion and at least partially bounding the through slot, and has an undercut wall connecting the ledge and the first portion. The crossover member has a flange and a crossover-grooved portion. A method for making a ball-nut assembly positions the crossover member from outside the ball nut to have the flange supported by the ledge and the crossover-grooved portion located in the through slot. The method also deforms the flange creating a staked portion of the flange which contacts the undercut wall of the outer surface of the ball nut.

Abstract: A spacer interposed between two adjacent balls formed into an elaborately designed cylinder like configuration which is able to minimize noise, vibration and frictional loss due to mutual collision and impact of the balls. The spacer is provided with a let through hole therein for further enhancing lubricating and cooling effect.

Abstract: A rolling-body screw drive (10) comprises a threaded spindle and a threaded nut (12) enclosing the threaded spindle. A helically running threaded channel (16) is provided between an outer circumferential surface of the threaded spindle and an inner circumferential surface (12a) of the threaded nut (12). The threaded channel (16) forms, together with a return channel (22) in the nut (12) which connects the two end regions (16a, 16b) of the threaded channel (16), an endless circulatory channel (24) in which an endless series of rolling bodies is accommodated. Each of the two end regions (16a, 16b) of the threaded channel (16) is assigned a deflecting element (18) which is retained on the threaded nut (12) and has a deflecting channel (20) for transferring the rolling bodies between the threaded channel (16) and the return channel (22). At least one of the deflecting elements (18) is made up of at least two deflecting-element parts (26, 28) which together bound the deflecting channel (20).

Abstract: A deflector type ball screw includes a screw shaft having an external thread groove in an outer peripheral surface, a ball nut having an internal thread groove in an inner peripheral surface and a plurality of balls that are rollably housed between the internal thread groove and the external thread groove, and four deflectors fixed to the ball nut. The deflectors function as by-passes linking adjacent internal thread grooves of the ball nut. As a result of the deflectors guiding the balls, the screw groove of the ball nut is divided into four circulation passages.

Abstract: Screw actuator (1, 71), in particular brake actuator, comprising a hollow screw (14, 45, 51, 63, 74) which is driven in rotation and a nut (10, 72) which can thereby be displaced in the axial direction and in the case of a brake actuator acts as a piston (19). Rotary elements (23) are accommodated in the grooves delimited between screw and nut. There are means for recirculating these rotary elements. These means comprise a recess (47, 52, 58, 64) in the screw. This recess decreases in size in the direction towards the center axis of the grooves. This recess may comprise a wall aperture between two adjacent screws. It is also possible to arrange a tube which connects two recesses of this type. A further option consists in fitting an insert part in a recess in the screw.

Abstract: The ball screw comprises a shaft including a spiral-shaped shaft groove having a semicircular-shaped (Gothic-arch-shaped) section, a nut including a spiral-shaped nut ball groove which corresponds to the shaft groove and has a semicircular-shaped (Gothic-arch-shaped) section, a large number of balls rotatably fitted into between the nut ball groove and shaft groove in such a manner that they are held by and between these two grooves, and a circulation member capable of defining a ball circulation passage for allowing the balls to circulate endlessly therethrough, wherein a portion of the nut ball groove is formed larger in the effective diameter than the remaining portions of the nut.

Abstract: Between two mutually adjoining load balls 5, there is interposed a retaining piece 10 having two concave surfaces 11 which are respectively opposed to the two adjoining load balls 5. The retaining piece 10 has an outside diameter dimension equal to or more than 0.5 times the outside diameter dimension of the load ball 5. Further, the retaining piece 10 has an outside diameter dimension which, when the retaining piece 10 passes through a screw groove circulation passage and a tube circulation passage, prevents the retaining piece 10 from touching the inner walls of these screw groove circulation passage and tube circulation passage, or has an outside diameter dimension which is equal to or less than 0.9 times the outside diameter dimension of the load ball.

Abstract: A screw actuator arrangement comprises a rotatable input shaft which is arranged to be driven, in use, by a drive arrangement. The input shaft is coupled to a non-rotatably mounted output shaft, and has a screw thread formation including a helical groove within which a plurality of spherical members are received to provide a ball screw coupling between the input and output shafts. The actuator further comprises means for applying a braking load to the input shaft so as to limit loading of the drive arrangement in the event that an external overload is applied to the output shaft, in use.

Abstract: A ball screw comprising a screw shaft 1 made of steel and having a thread groove 6 on outer peripheral surface, a ball nut 2 made of steel and having a thread groove 7 opposing the thread groove 6 on inner peripheral surface, a return tube 3 attached on the ball nut 2, and a plurality of balls inserted between the two thread grooves 6 and 7 and in the return tube 3. As the balls, steel balls 4 made of bearing steel and ceramic balls 5 made of silicon nitride are disposed alternately at a given ratio. Diameter Dc of the ceramic ball 5 is set to a value smaller than diameter Ds of the steel ball 4 so that contact stress acted on contact surfaces of the ceramic ball 5 and the two thread grooves 6 and 7 will be equal to contact stress acted on contact surfaces of the steel ball 4 and the two thread grooves 6 and 7.

Abstract: The invention provides a ball screw which is little subject to deterioration of operating characteristics and occurrence of wear, torque change, noise, vibration, etc. during operation due to stagnation or competition of balls. A ball screw comprising a screw shaft having a helical thread groove formed on the outer surface thereof and a nut having a thread groove formed on the inner surface thereof corresponding to the thread groove on the screw shaft which engages with the screw shaft with the interposition of a number of balls rollably provided in a helical ball rolling path formed between the two thread grooves, wherein the variation of the total of the gap between said balls during the rolling of the balls is smaller than {fraction (1/20)} of the diameter of the ball.

Abstract: A ball screw device utilizes spacers having concave ball-contacting surfaces with distributed protrusions or dimples. Balls having needle-like recesses may also be used. The spacers are provided in two thicknesses, and the relative numbers of the thinner and thicker spacers are selected in order to ensure retention of the spacers in their proper positions, while providing a small clearance between the balls and spacers to avoid fluctuations or sharp increases in dynamic torque.

Abstract: A ball screw 2 or a sliding screw 2a has a driving force-transmitting shaft 4 or 4a and a bearing member 6 or 6a externally fitted to the driving force-transmitting shaft 4 or 4a. The driving force-transmitting shaft 4 or 4a is made of aluminum or aluminum alloy, and the bearing member 6 or 6a is made of any one of synthetic resin, aluminum, and aluminum alloy. The member, which is formed by using the aluminum or the aluminum alloy, is applied with a surface treatment, and preferably, it is further applied with a surface finish treatment.

Abstract: An actuator for actuating a control mechanism by axially moving an actuating member against a force comprises a housing in which a reversible drive is arranged with a first rotatable part and a second rotatable part engagable with one another and acting on the actuating member for axially moving it in feed direction to the control mechanism upon rotation in one direction. An electric motor rotates the first rotatable part and the second rotatable part by engagement with the first rotatable part. A rotation prevention member prevents rotation of at least one of the rotatable parts in a second direction. A release releases the rotation prevention member to permit rotation of at least one of the rotatable parts to permit the actuating member to be axially moved in a direction opposite to the feed direction.

Abstract: A rolling-body screw drive includes a threaded spindle and a threaded nut (10) enclosing the threaded spindle, a helically running threaded channel being provided between an outer circumferential surface of the threaded spindle and an inner circumferential surface (24) of the threaded nut (10), the threaded channel forming, together with a return channel (50) which connects the two end regions of the threaded channel, an endless circulatory channel in which an endless series of rolling bodies is accommodated. A deflecting element (32, 34) is mounted in a cutout (28, 30) in the nut adjacent each end region of the threaded channel. Each deflecting element has a deflecting channel (64) for transferring the rolling bodies between the threaded channel and the return channel (50) and between the return channel (50) and the threaded channel.

Abstract: A super finishing is carried out after grinding, so that surface roughness of a ball rolling groove of a screw shaft is made 0.12 &mgr;m or less in an average roughness (Ra). Separators 7 having ball holding surfaces shaped in concave surface are disposed between balls respectively.

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: The present invention is directed to a power assisted steering system (10). The power assisted steering system (10) comprises a rotatable member (34) capable of rotating about an axis. The system further comprises a ballnut (66) that is coaxial with the rotatable member (34). The ballnut (66) has a threaded cylindrical inner surface (76) and a plurality of drive balls (78). The system (10) further comprises a steering member (24). The steering member (24) is coaxial with the rotatable member (34) and the ballnut (66). The steering member (24) has a threaded portion (32). The steering member (24) extends through the inner surface (72) of the ballnut (66) such that the drive balls (78) of the ballnut (66) engage the threaded portion (32) of the steering member (24). The ballnut (66) is rotatably driven by the rotatable member (34) about the axis and is pivotal relative to the rotatable member (34) in a direction transverse to the axis.

Abstract: A ball rolling groove 1c is defined in an inner peripheral surface of A ball screwed nut 1 by a rolling process, not by a grinding process so that a ball screwed nut having small diameters or large leads can be manufactured. The surface of the ball rolling groove 1c is finished to be sharp without concave and convex by a plastic working by the rolling process, so that the surface is less rough. By rolling the surface by the rolling process excellent in durability, the precision of R shape of the ball rolling groove 1c can be made excellent.

Abstract: In a roller retainer assembly, a roller retainer 15 is thinned to retain individual one of plural rollers 7 circulating in a roller circulation path inclusive of linear and curved races and to hold opposite side surfaces of the roller 7 and front and rear surfaces thereof in the roller moving direction. A combination of linear and curve guide portions 16a and 16b different in inclination angle and a combination of linear and curve guide portion 17a and 17b different in inclination angle are formed respectively in opposite end surfaces of the roller retainer 15 in a retainer moving direction. In a linear race, the linear guide portions 16a and 17a come into contact with adjacent roller retainers 15 respectively. In a curved race, the curve guide portions 16b and 17b come into contact with adjacent roller retainers 15 respectively.

Abstract: A rolling-body screw drive includes a threaded spindle and a threaded nut (10) enclosing the threaded spindle, a helically running threaded channel being provided between an outer circumferential surface of the threaded spindle and an inner circumferential surface (24) of the threaded nut (10), the threaded channel forming, together with a return channel (50) which connects the two end regions of the threaded channel, an endless circulatory channel in which an endless series of rolling bodies is accommodated. A deflecting element (32, 34) is mounted in a cutout (28, 30) in the nut adjacent each end region of the threaded channel. Each deflecting element has a deflecting channel (64) for transferring the rolling bodies between the threaded channel and the return channel (50) and between the return channel (50) and the threaded channel.

Abstract: A ball screw assembly includes a screw shaft with a spiral groove, balls along the groove, a nut with the screw shaft relatively rotatable with the balls, and a seal device.