Class / Patent application number | Description | Number of patent applications / Date published |
074424860 | Return path geometry | 73 |
20080196528 | Internal Circulation Ball Screw - An internal circulation ball screw comprises a nut, a screw, a plurality of return assemblies, and a plurality of balls. The nut is threaded on the screw through the balls. An arc-shaped curving surface is formed on the edge of a tip of an outer thread of the screw and is to be connected to a return path of the return assemblies. The radius of the arc-shaped curving surface of the screw is between 9%-17% of the diameter of a ball, and each of the outer threads of the screw has three different curvature sections formed at the positions where the balls climb over, which are climbing curvature section, fillet curvature section and tip curvature section. By such arrangements, the internal circulation ball screw can allow the balls to move more smoothly and stably, and keep the balls from falling off or deflecting. | 08-21-2008 |
20090090207 | External Circulation Type Ball Screw - An external circulation type ball screw is provided with a helical passage in the outer surface of the nut. The helical passage and the inner helical groove of the nut are opposite in winding direction to each other. The nut is defined with two through holes which are connected to both ends of the inner helical groove and the helical passage, respectively, so that the helical passage and the inner helical groove are connected to each other to form a circulating path for the circulation of the balls. Since the helical passage winds about the outer periphery of the nut, the balls can roll more smoothly. | 04-09-2009 |
20090107273 | Ball screw device having circulating device background of the invention - A ball screw device includes a screw shaft rotatably engaged with a ball nut, and a number of bearing members received between the ball nut and the screw shaft, and a circulating device for circulating the bearing members, the circulating device includes an elongate member having two end blocks for engaging into the ball nut and having a passage for receiving the bearing members, and includes a housing member and a casing member each having a portion of the passage of the elongate member for allowing the passage of the elongate member to be opened and exposed and for allowing the housing member and the casing member to be formed with molding procedures. | 04-30-2009 |
20090158873 | Roller Screw with a Circulating Structure - A roller screw with a circulating structure mainly comprises two circulating members and a return pipe. Each circulating member includes a return path that is rotated relative to a tangent plane tangent to the circumference of the helical groove of the nut, and the cross section of each return path is square-shaped. The return pipe is formed with a guiding route having a square-shaped cross section, and both ends of the guiding route are connected to the return paths of the circulating members, respectively. The return paths are connected to and tangent to the helical grooves, and an angle between the tangent surfaces is approximately 90 degrees. By such arrangements, the cross section of the roller screw with a circulating structure is continuous and complete, such that the rollers can be circulated in each path smoothly | 06-25-2009 |
20100031763 | Multi-Cycle Ball Screw - A multi-cycle ball screw comprises a screw, a nut, a plurality of balls and circulating caps. The screw is provided with at least two screw helical grooves in an outer surface thereof. The nut is provided with nut helical grooves opposite to the screw helical grooves. The balls are disposed between the helical grooves of the screw and the nut. Each circulating cap is provided with a circulating groove having an opening at both ends thereof and a guiding portion between the two openings. The circulating caps are connected to two points of one screw helical groove by two openings thereof while the guiding portion thereof crosses over the other screw helical groove. By repeating this cooperation method, a multi-cycle ball screw can be formed. | 02-11-2010 |
20100064836 | Roller Screw Having Plural Circulating Devices Cooperating with Plural Helical Grooves - A roller screw having plural circulating devices cooperating with plural helical grooves comprises a screw, a nut, plural rollers and circulating devices. The screw is provided in a surface with at least two helical grooves. The nut is provided with helical grooves opposite to the screw and receiving holes in a peripheral wall thereof, and each receiving hole is provided with a fixing groove at each of two ends thereof. The rollers are arranged in the helical grooves of the screw and the nut. The circulating devices have the same number of the helical grooves of the screw, and each circulating device includes an opening at each of two ends thereof and a passage between the two openings. | 03-18-2010 |
20100101349 | Ball screw device having ball return pipe - A ball screw device includes a screw engaged into a nut member for forming an endless ball guiding passage between the nut member and the screw and for receiving a number of ball bearing members, a ball return pipe includes a U-shaped structure having a central tubular member and two ends for engaging into two orifices of the nut member, and the nut member includes a straight fence formed between the orifice and the screw hole of the nut member for guiding the ball bearing members to move through a ball return pathway of the ball return pipe and the endless ball guiding passage of the nut member and for preventing the teeth of the nut member from being broken by the ball bearing members. | 04-29-2010 |
20110048151 | External Circulation Type Ball Screw with a Noise-Reduction Structure - An external circulation type ball screw with a noise-reduction structure is provided with a noise-reduction cover to be mounted on the outside of the nut. The noise-reduction cover is defined with a noise-reduction groove with two ends located correspondingly to impacting portions of the return path of the return member where the rolling elements impact the return path. With the design of the noise-reduction groove, noises will counteract each other after being transmitted to the noise-reduction groove, thus reducing the noises produced by the rolling elements impacting the return member and accordingly reducing the noises produced during operation of the ball screw. | 03-03-2011 |
20110154926 | Circulation Element for Ball Screw - 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. | 06-30-2011 |
20110154927 | Circulating device for motion guide apparatus - A motion guide device includes a ball nut attached onto a shaft and having helical grooves for receiving ball bearing elements, a ball circulating member is engaged with the ball nut and includes a ball circulating channel communicative with the helical groove of the ball nut, and includes an intermediate segment and two end segments, a ball coupler includes two flexible coupling members for engaging with the ball bearing elements, and the ball circulating member includes two opposite guide pathways for receiving the flexible coupling members of the ball coupler, and curved relative to the ball circulating member for an angle ranged between 160-220 or 175-185 degrees, such as 180 degrees for smoothly guiding the flexible coupling members to move through the ball circulating member. | 06-30-2011 |
20110239799 | LINEAR MOTION ASSEMBLY WITH RECIRCULATION INSERT - 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. | 10-06-2011 |
20110252908 | RETURN STRUCTURE FOR A BALL SCREW WITH A CHAIN TYPE ROLLING ASSEMBLY - A ball screw comprises a screw, a nut, two return assemblies and a rolling assembly. The two return assemblies are disposed in two ends of the nut, and each of the return assemblies is defined with a return passage provided with two guiding grooves at two sides thereof for guiding the linking portions of the rolling assembly. The guiding grooves twist an angle of about 90 degrees within the return portion of each of the return assemblies to prevent the linking portions from being stretched or extruded improperly to reduce the deformation to the lowest, thus effectively extending the service life of the rolling assembly. | 10-20-2011 |
20110314941 | SECTIONAL CIRCULATING ASSEMBLY FOR A BALL SCREW - A sectional circulating assembly for a ball screw comprises an inner circulating block and an outer circulating block. In assembly, the inner circulating block is initially placed between the screw shaft and the nut before the rolling balls and the screw shaft are positioned, thus preventing the rolling balls from dropping out and the interference with the threads. After the rolling balls and the screw shaft are positioned, the outer circulating block is placed into the nut and to be engaged with the inner circulating block, and the outer circulating block is fixed to the nut. This method can maintain the tightness of the nut, thus preventing the leakage of noise. | 12-29-2011 |
20120000306 | BALL SCREW WITH A BUFFERING CIRCULATION MEMBER - A ball screw with a buffering circulation member comprises: a screw, a nut, a circulation member, a plurality of rolling elements and a plurality of flexible members. The circulation member comprises a first structure and a second structure. The flexible members are disposed at the combining portion between the circulation member and the nut to allow the first and second structures to be assembled more closely in a seamless manner. The flexible members which support the circulation member can absorb or buffer the collision of the rolling elements, thus reducing the vibration of the rolling elements or the noise caused by the collision of the rolling elements. | 01-05-2012 |
20120017713 | ROLLING ELEMENT SCREW DEVICE - Provided is a rolling-element screw device which does not sacrifice a stroke distance of a nut member ( | 01-26-2012 |
20120073397 | Ball screw module - 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. | 03-29-2012 |
20120090419 | MULTI-CYCLE BALL SCREW - A multi-cycle ball screw comprises a screw, a nut, a plurality of balls and circulating caps. The screw is provided with at least two screw helical grooves in an outer surface thereof. The nut is provided with nut helical grooves opposite to the screw helical grooves. The balls are disposed between the helical grooves of the screw and the nut. Each circulating cap is provided with a circulating groove having an opening at both ends thereof and a guiding portion between the two openings. The circulating caps are connected to two points of one screw helical groove by two openings thereof while the guiding portion thereof crosses over the other screw helical groove. By repeating this cooperation method, a multi-cycle ball screw can be formed. | 04-19-2012 |
20120103121 | Ball screw device having ball return pipe - A ball screw device includes a screw engaged into a nut member for forming an endless ball guiding passage between the nut member and the screw and for receiving a number of ball bearing members, a ball return pipe includes a U-shaped structure having a central tubular member and two ends for engaging into two orifices of the nut member, and the nut member includes a straight fence formed between the orifice and the screw hole of the nut member for guiding the ball bearing members to move through a ball return pathway of the ball return pipe and the endless ball guiding passage of the nut member and for preventing the teeth of the nut member from being broken by the ball bearing members. | 05-03-2012 |
20120325036 | Ball Screw and Manufacturing Method of Nut for Ball Screw - A ball screw is provided in which an outer circumferential formation is formed at a portion facing a ball circulating passage out of outer circumferential surface of a nut. The ball screw includes: a screw shaft having on its outer circumferential surface a screw groove; a nut having on its inner circumferential surface a screw groove facing the screw groove; a plurality of balls rollably loaded in a spiral ball rolling passage formed by both screw grooves; and a ball circulating passage to return the balls from a start point to an end point of the ball rolling passage for recirculation. The ball circulating passage is a concaved groove formed by concaving a groove on a part of the cylindrical inner circumferential surface of the nut by plastic working. Then, a flange is integrally provided at a portion facing the ball circulating passage and the screw groove. | 12-27-2012 |
20130008275 | Method for Manufacturing Nut for Ball Screw and Ball Screw - 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. | 01-10-2013 |
20130081497 | MOTION TRANSMISSION MODULE WITH A COOLING DEVICE - 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. | 04-04-2013 |
20130133453 | INTERNAL CIRCULATION BALL SCREW - An internal circulation ball screw includes a threaded shaft, a nut having a receiving space, a circulation member mounted to the receiving space and having a first circulation groove and a second circulation groove, and a plurality of rolling members running between the threaded shaft and the nut. The first circulation groove defines a first front section, a first rear section, and a first curved section communicating with the first front section and the first rear section separately. The second circulation groove defines a second front section, a second rear section, and a second curved section communicating with the second front section and the second rear section separately. The first and second curved sections define a predetermined included angle with respect to the threaded shaft radially. Therefore, the wall between the circulation channels is uniform to enhance the durability of the ball screw. | 05-30-2013 |
20130139628 | Method of Production of Nut for Ball Screw Use and Ball Screw - A method forms ball recirculation and rolling grooves at an inner circumferential surface of a nut for ball screw use in a state free of deviation in axial, circumferential, and radial nut directions. A flange end face is formed with a concave part, then an inner circumferential surface of a blank and an end face and outer circumferential surface of the flange are continuously ground. Due to this, the coaxiality of the blank inner circumferential surface and the flange outer circumferential surface, and the perpendicularity of the flange end face to the blank inner circumferential surface, are made smaller. The blank is plastically worked to form the ball recirculation groove and is cut to form the ball rolling groove while using the concave part as a phase reference, the end face as an axial direction reference, and the outer circumferential surface as a radial direction reference. | 06-06-2013 |
20130139629 | ROLLING ELEMENT SCREW ASSEMBLY - 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. | 06-06-2013 |
20130199324 | BALL SCREW ASSEMBLY - A ball screw assembly having a bearing ball recirculation arrangement. The ball screw assembly includes a ball screw, a nut, and at least one set of two return plugs and at least one cap. The nut body is in threaded engagement with the ball screw, wherein one of the ball screw and the nut body is rotationally fixed relative the other. Each plug may be seated into a cavity on an outer surface of the nut body. The cap may have a recessed channel at least partially defining a return path for bearing balls from one end of a load bearing path to another end of a load bearing path. | 08-08-2013 |
20130239725 | Ball Screw Device - A ball screw device even with a small lead angle and a small number of circulation rolls, includes a rotational part, which keeps unequal division of tongue portions and legs connected to the tongue portions to a minimum and ensures the strength of the tongue portions. A recirculating part of the ball screw device includes a pair of legs, each having a tongue portion for scooping up balls in a direction approximately tangential to a spiral raceway, and a main body connecting the pair of legs. First divided faces for dividing the pair of legs along a ball recirculating path, and a second divided face for dividing the main body along the ball recirculating path are also included. The second divided face is formed by an upper divided face and a lower divided face of the ball recirculating path so that the upper divided face and the lower divided face intersect with each other when viewed from a flat surface of the nut. | 09-19-2013 |
20130247701 | BALL SCREW - Ball screw comprising a ball nut ( | 09-26-2013 |
20130255420 | Ball Screw Device - A ball screw device for reducing damage to a circulating part even during a high speed operation is provided. To this end, the circulating part includes a pair of legs having a tang to scoop up a ball in a direction substantially match with a tangential direction of a spiral path, and a body to connect the pair of legs, wherein a center path diameter Rb of the ball, an internal diameter Rn of the nut, and an internal diameter Rt opposite to the tang satisfy a relationship of Rb≦Rt≦Rn. | 10-03-2013 |
20130298710 | SPINDLE NUT FOR A BALL SCREW - A spindle nut for a ball screw with a nut part on whose inner periphery there is a spiral ball groove that winds around a spindle axis for the rolling of balls and with two deflection elements, the balls are deflectable into the curved deflection channel of each deflection element and the nut part has two recesses that are spaced apart from each other in the axial direction and one of the deflection elements is arranged in each recess. The nut part is provided with a straight return channel for the balls, and the straight return channel is connected to the two deflection channels. The balls are movable along a ball track in the curved deflection channel and in the straight return channel, and the straight return channel is arranged within a wall thickness of the spindle nut and is arranged at an angle relative to the spindle axis. | 11-14-2013 |
20140033847 | MOTION TRANSMISSION MODULE WITH A COOLING DEVICE - 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. | 02-06-2014 |
20140096633 | BALL SCREW DEVICE HAVING PRELOAD STRUCTURE - 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. | 04-10-2014 |
20140096634 | BALL SCREW DEVICE AND ELECTRIC POWER STEERING SYSTEM INCLUDING THE SAME - A ball screw nut of a ball screw device is fastened to a motor shaft by engaging a male thread portion thereof with a female thread portion of the motor shaft. In a case where, in a movement pathway for balls, an area where the balls roll under load from a rack shaft and the ball screw nut is set as a load area, an area that does not receive the load is set as a no-load area, and areas for transition from the load area to the no-load area are set as transition areas, the male thread portion is formed such that the transition area on the nut-side joint portion-side closest to a seating surface does not overlap phase ranges of cut portions in a state where the ball screw nut is fastened to the motor shaft. | 04-10-2014 |
20140182407 | CIRCULATING ELEMENT FOR BALL SCREW AND BALL SCREW USING THE CIRCULATING ELEMENT - A circulating element for ball screw includes a first surface defining a circulating passage that extends from one lateral side of the first surface to the other lateral side of the first surface and has a coupling mouth located on each of the two opposite ends thereof, and a second surface defining a coupling groove between the two coupling mouths of the circulating passage and two guide blocks respectively protruding out of the coupling mouths of the circulating passage. Thus, the circulating element has the advantages of low processing cost, ease of installation, high alignment accuracy, and excellent running smoothness. | 07-03-2014 |
20140352471 | MOTION GUIDE DEVICE, BALL SCREW ASSEMBLY, AND END CAP - A ball screw assembly has a screw shaft, a nut, a plurality of balls, and two end caps. The screw shaft has a spiral rolling groove formed on an outer surface thereof. The nut has a spiral load rolling groove formed on an inner surface thereof. The screw shaft passes through the nut, and the rolling groove aligns with the load rolling groove, and the rolling groove and the load rolling groove jointly define a raceway. The balls are disposed between the rolling groove of the screw shaft and the load rolling groove of the nut. The end caps respectively arranged on two opposite sides of the nut. The screw shaft passes through the end caps, one end surface of each end cap is exposed from the nut, and each one of the end surfaces has a plurality of dust discharge outlets formed thereon. | 12-04-2014 |
20150027257 | BALL SCREW - A ball screw includes a screw, a nut and a plurality of balls. The nut is slidingly disposed on the screw and includes a nut body and at least one end assembly. The end assembly includes an end circulation member, a dust-proof member and a fastening member. The fastening member and the end circulation member are disposed on the opposite sides of the dust-proof member. One side of the fastening member includes a plurality of projections, and the other side of the fastening member includes a plurality of indentations corresponding to the projections. | 01-29-2015 |
074424870 | Rolling element deflector | 38 |
20080210038 | Ball Screw Device - To provide a ball screw device capable of improving operability and productivity. In a ball screw device | 09-04-2008 |
20080295630 | Preload Structure for a Ball Screw - A preload structure for a ball screw in the inner surface of a nut is formed a helical groove whose lead is different from the lead of the adjacent helical groove to produce a lead deviation between the helical groove of the nut and the helical groove of the screw. By such arrangements, the lead deviation can be used to achieve the preload objective, thus reducing the fitting number demanded of the circulation system. Consequently, not only the single circulation system fittings can be used, but also the length of the nut is shorter and without extra machining, and the producer only needs to control the deviation of the interval helical track during rubbing to achieve various preload changes. | 12-04-2008 |
20090013811 | External Circulation Type Ball Screw - An external circulation type ball screw comprises a screw, a nut, rolling elements and a return member. The nut is a hollow structure mounted on the screw. The rolling elements are received in the helical groove of the screw and the rolling groove of the nut. The return member is disposed on the nut and includes a guiding member and a cover. The guiding member is defined with two guiding portions and a first half pipe, and each guiding portion is fixed in the fixing hole of the nut. The cover includes a fixing portion for covering the guiding portion and a second half pipe for covering the first half pipe. The return member is installed in the fixing hole through the guiding portion, and then the cover is used to cover the guiding member, thus finishing the assembly of the return member. In addition, the return device can be produced by molding process, and it solves the problem that the conventional return device is difficult to assemble. | 01-15-2009 |
20090064811 | BALL SCREW DEVICE - Provided is a ball screw device capable of downsizing a nut member ( | 03-12-2009 |
20090084212 | SCREW DEVICE AND METHOD OF MANUFACTURING THE SAME - Provided is a screw device capable of preventing occurrence of any elevation change at a joint between a ball return path of a circulation member and a loaded ball rolling groove of a nut. | 04-02-2009 |
20090151493 | ROLLING-ELEMENT SCREW DEVICE AND METHOD OF ASSEMBLING THE SAME - The present invention provides a rolling-element screw device capable of offering advantages of both an end cap type ball screw and a return pipe type ball screw and belonging to an intermediate new category between these ball screws. | 06-18-2009 |
20090158874 | Ball screw - A ball screw includes a screw shaft, in which a thread groove is formed in an outer peripheral face thereof, that includes a small-diameter portion with a diameter smaller than an outer diameter of the screw shaft formed integrally at one end of the screw shaft; a nut, through which the screw shaft passes, having a thread groove formed in an inner peripheral face thereof; a plurality of balls disposed in a ball passage formed by the thread groove of the screw shaft and the thread groove of the nut; and a ring-shaped stopper, immovably fitted on the small-diameter portion, that prevents the nut from moving. | 06-25-2009 |
20090249911 | SCREW DEVICE - The present invention provides a screw device enabling insulation of sounds occurring from the inside of the screw device when circulating rolling elements. | 10-08-2009 |
20090293658 | LOW-NOISE SCREW DEVICE - Provided is a screw device capable of reducing noise generated therefrom. | 12-03-2009 |
20100043583 | BALL SCREW MECHANISM - A ball screw mechanism is equipped with a ball screw shaft formed from a metallic material, a displacement nut inserted over an outer circumferential side of the ball screw shaft, steel balls installed between a first screw groove formed on the ball screw shaft and a second screw groove formed in the displacement nut, and a pair of first and second return members, through which the steel balls are circulated between one end side and another end side of the displacement nut. The first and second return members include main body parts mounted respectively onto one end and another end of the displacement nut, and cylindrical parts that project outwardly with respect to the main body parts. A return passage, through which the steel balls are circulated, is formed inside of the main body parts and the cylindrical parts. | 02-25-2010 |
20100050801 | Ball screw module - 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. The screw shaft and the nut member constitute a first load rolling track rolling in a first spiral direction. The circulating device is connected with the first load rolling groove and has a circulating route. The circulating route includes an intermediate route, connecting routes at the two ends of the intermediate route, and at least a guiding groove. The guiding groove guides the ball connector rotating in a second spiral direction along the connecting routes, wherein the second spiral direction is opposite to the first spiral direction. The guiding groove guides the ball connector rotating in a third spiral direction along the intermediate route, wherein the third spiral direction is the same as the first spiral direction. | 03-04-2010 |
20100064837 | BALL SCREW - A ball screw drive comprising a ball nut ( | 03-18-2010 |
20100071494 | Ball Screw Unit with Dual Ball Deflect Arrangements - A ball crew unit with dual ball deflect arrangements includes a pair of circulation ball deflect units. One of them is equipped axially in a first cavity provided in the nut, while the other is equipped radially in a second cavity provided in the nut. By so, the traditional buck toothed design for the external helical grooves of the shaft can be eliminated, and is unnecessary to lengthen the nut in order to avoid mutual interference between the ball deflect unit and the nut flange, the circulation tunnel formed in the nut does not have to run through the whole nut either so that the structure of the ball screw unit can be simplified. As a result the assembly work is facilitated, production cost is reduced while the mechanical property is upgraded. | 03-25-2010 |
20100126292 | Deflector for ball screw device - A ball screw device includes a screw engaged into a nut member for forming an endless ball guiding passage between the nut member and the screw and for receiving a number of ball bearing members, a deflector includes a deflector member engaged into the nut member and having an upwardly extended ridge engaged with a recess of the nut member to position the deflector member to the nut member and to prevent the deflector member from deviating relative to the nut member, and a fastener is secured to the nut member to force the ridge of the deflector member to solidly engage with the recess of the nut member and to suitably anchor or position the deflector to the nut member. | 05-27-2010 |
20100132494 | BALL SCREW DEVICE HAVING TUNNEL RACEWAY, AND METHOD FOR MANUFACTURING THE SAME - A ball screw device of a screw axis with a helical groove on its outer circumference for balls to circulate thereon includes a nut with a helical groove on its inner circumference for balls to circulate thereon, a number of balls to circulate in an orbit along the helical groove of the screw axis and the helical groove of the nut, and a tunnel raceway for the balls to circulate unlimitedly. The device has a through-hole formed within the wall of the nut for the balls to circulate from one end of the helical groove to the other end, the through-hole having a guidepath on either end of the helical groove to feed the balls into the tunnel raceway. Means are provided between the helical groove on one end face of the nut and the helical groove on the screw axis to prevent the balls from exiting either helical groove. | 06-03-2010 |
20100139433 | Ball screw with a circulation member - A ball screw with a circulation member comprises: a screw, a nut, a circulation member, a plurality of rolling elements and a plurality of flexible members. The flexible members are disposed at the combining portion between the circulation member and the nut to allow them to be assembled closely, and to prevent the circulation member and the nut from being damaged when they are assembled and disassembled. | 06-10-2010 |
20100180707 | Rolling Element Screw - A rolling element screw comprises a screw and a nut mounted on the screw. The screw and the nut are defined with opposite rolling grooves to form a loaded path in which plural rolling elements are to be disposed. The nut is provided with a return element at each of two opposite ends thereof for cooperating with the loaded path. The respective return elements include a return path, and the return paths of the two return elements connect with the loaded path to form a circulation path. The junction where the respective return paths of the return elements are connected to the loaded path is designed to be an inclined surface including a lower portion and an upper portion. There is a height difference between the nut rolling grooves and the respective return paths, so that the rolling elements can roll more smoothly without causing the jammed problem. | 07-22-2010 |
20100236346 | Ball screw - Ball screw, having a spindle nut ( | 09-23-2010 |
20100242652 | BALL SCREW DEVICE - Provided is a ball screw device having a novel ball circulation structure suitable for a screw shaft with a large lead, optimum for downsizing and weight saving of a nut member, capable of being manufactured at low cost, and capable of exhibiting high reliability even under severe use conditions. In a ball screw device ( | 09-30-2010 |
20100242653 | Deflecting body for a ball screw - A deflecting body for a ball screw, which has two body parts to be connected to one another which delimit a deflecting channel which carries rolling bodies. Latching or jamming projections are provided on one or both body parts. The latching or jamming projections, in the assembled final position, latch or are jammed in a frictionally engaging manner in latching or jamming receptacles provided on the other body part. | 09-30-2010 |
20100263467 | ROLLER SCREW - Provided is a roller screw capable of preventing rollers moving from an unloaded return path to a loaded roller rolling path from coming into collision with a scooping portion. The roller screw has: a screw shaft | 10-21-2010 |
20100307272 | Deflecting device for motion guide apparatus - A motion guide device includes a ball nut attached onto a shaft and having helical grooves and a returning channel for forming an endless ball guiding passage and for receiving a number of ball bearing elements, two deflecting devices are engaged with the ball nut and each include a deflecting pathway communicative with the helical groove and the returning channel of the ball nut and each include a protrusion engaged with a recess of the ball nut for anchoring the deflecting devices to the ball nut, and the deflecting devices each include a connecting surface directed toward the helical groove of the ball nut for guiding the ball bearing elements to smoothly move between the helical groove of the ball nut and the deflecting pathways of the deflecting devices. | 12-09-2010 |
20110138950 | Motion guide apparatus - A motion guide device includes a ball nut attached onto a shaft and having helical grooves for receiving ball bearing elements, and a ball coupler including a flexible coupling member having a number of openings formed between spacers for receiving ball bearing elements, the ball bearing element is contacted with the ball nut at a contact point which is spaced from the inner peripheral surface of the ball nut for a spacing distance, and the ball bearing element is contacted with the screw shaft at a contact point which is spaced from the outer peripheral surface of the screw shaft for a spacing distance that is preferably smaller than the spacing distance between the contact point of the ball bearing element and the ball nut. | 06-16-2011 |
20110296939 | BALL SCREW APPARATUS AND ELECTRIC POWER STEERING APPARATUS - The ball screw apparatus includes a returning way L | 12-08-2011 |
20120132025 | Ball Screw - A ball screw prevents loosening of a bolt for fixing a deflector to reduce noise, and endures high-speed working conditions. A female hole is formed in a deflector arranged, with the both ends thereof joined together, at a position on both ends of the ball returning member on an inner peripheral surface of the nut. The deflector is fixed to the nut with two bolts inserted into a bolt insertion hole formed on the nut. A cross-section perpendicular to a scooping-up direction of the scooping-up surface of the deflector has a concave curved surface having a radius of curvature slightly larger than a radius of the ball. The concave curved surface is of a shape to scoop up the ball ejected from the ball rolling path in a tangential direction of a screw line. The deflector may be made of resin material. | 05-31-2012 |
20120160048 | DEFLECTING DEVICE FOR MOTION GUIDE APPARATUS - A motion guide device includes a ball nut attached onto a shaft and having helical grooves and a returning channel for forming an endless ball guiding passage and for receiving a number of ball bearing elements, two deflecting devices are engaged with the ball nut and each include a deflecting pathway communicative with the helical groove and the returning channel of the ball nut and each include a protrusion engaged with a recess of the ball nut for anchoring the deflecting devices to the ball nut, and the deflecting devices each include a connecting surface directed toward the helical groove of the ball nut for guiding the ball bearing elements to smoothly move between the helical groove of the ball nut and the deflecting pathways of the deflecting devices. | 06-28-2012 |
20130055839 | BALL SCREW WITH SECTIONAL CIRCULATING ASSEMBLIES - A ball screw with sectional circulating assemblies comprises an inner circulating block and an outer circulating block. In assembly, the inner circulating block is initially placed between the screw shaft and the nut before the rolling balls and the screw shaft are positioned, thus preventing the rolling balls from dropping out and the interference with the threads of the screw shaft. After the rolling balls and the screw shaft are positioned, the outer circulating block is placed into the nut and engaged with the inner circulating block, and the outer circulating block is fixed to the nut. This method can maintain the tightness of the nut, thus preventing the leakage of noise. | 03-07-2013 |
20130068058 | BALL SCREW HOLDING SYSTEM FOR INSERT - Ball screw system comprising a screw having an external threading, a nut having an internal threading and a series of balls being engaged in the threadings to link the screw and the nut, the nut comprising ball recirculation means comprising at least one ball deflection element inserted into a through hole of the wall of the nut, from outside to inside as far as abutment means, in which the nut is equipped with a retaining means which bears on a peripheral wall of this nut, over at least a part of its length, and which bears on an external face of the deflection element, the permanent retaining means being self-held and ensuring that the deflection element is held permanently in the through hole. | 03-21-2013 |
20130220046 | DEFLECTING DEVICE FOR BALL SCREW DEVICE - 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. | 08-29-2013 |
20130220047 | Ball Screw - A ball screw having a groove-shaped ball return passage has improved durability, ball circulation performance, and working performance. The ball screw is provided with: a threaded shaft having a spiral groove at its outer circumferential surface; a nut having a spiral groove which faces the spiral groove at its inner circumferential surface; a plurality of balls rotatably loaded in a spiral raceway constituted by the two spiral grooves; and a ball circulation groove which returns and circulates the balls from an end point to a start point of the raceway. Further, the edge portions constituted by the two side surfaces of the ball circulation groove and the surfaces which continue from the side surfaces and extend in the axial direction are formed to be rounded. | 08-29-2013 |
20130283953 | BALL SCREW WITH AN IMPROVED END DEFLECTOR - In a ball screw ( | 10-31-2013 |
20140174232 | ROLLER ELEMENT RETAINER FOR BALL SCREW DEVICE - A motion guide device includes a ball nut attached onto a shaft and having helical grooves for forming a ball guiding raceway between the ball nut and the elongated shaft and for receiving ball bearing elements, a circulating device attached to the ball nut and having a pathway communicative with the raceway for forming an endless ball guiding passage between the ball nut and the elongated shaft and the circulating device and for engaging with bearing elements, and a retaining device includes a shorter chain for engaging into the helical grooves or raceway of the screw shaft and the ball nut, and a longer chain for engaging into the pathway of the circulating device. | 06-26-2014 |
20140251050 | LOAD ADJUSTABLE BALL SCREW DEVICE - A ball screw device includes a screw engaged into two nut members for forming a ball guiding passage between the nut members and the screw member and for receiving and engaging with bearing members, and a load applying device is disposed on the screw member and disposed between the nut members and applies a load onto the nut members in order to force and move the nut members away from each other and so as to apply a force onto the ball bearing members and in order to stably anchor and retain the ball bearing members between the nut members and the screw member and in order to facilitate a movement between the nut members and the screw member. | 09-11-2014 |
20140290410 | BALL SCREW DEFLECTOR - In an electric power steering system, there is provided a ball screw deflector configured to make it possible to easily measure the whole length of each of deflector pieces. A mating face of each of the deflector pieces and end faces of the deflector pieces are parallel to each other, and have an angle corresponding to a lead angle of a ball screw portion. Thus, it is possible to reduce the amount of material required to form each of the deflector piece pieces. In addition, it is possible to easily measure the overall length of each of the deflector pieces with the use of measuring equipment such as a vernier caliper. | 10-02-2014 |
20140352472 | END CAP-TYPE BALL SCREW ASSEMBLY AND CIRCULATOR - A circulator comprises a circulating body and an extending rib. The circulating body is formed with an arc-shaped circulating passage. The extending rib is integrally radial inwardly extended from a curved portion of the circulating body. The curved portion of the circulating body is configured toward an inner direction of the circulating passage by reinforcement of the extending rib to increase a radius of the circulating passage. Moreover, the instant disclosure further provides an end cap-type ball screw assembly. | 12-04-2014 |
20150027258 | BALL SCREW DEVICE - A ball screw device includes a piston that surrounds the outer periphery of a ball nut. An outer periphery turning groove is formed in the outer peripheral face of the ball nut. The outer periphery turning groove and the inner peripheral face of a cylindrical portion of the piston constitute a turning rolling path. The turning rolling path and connection passages of deflectors constitute a returning path through which balls are returned from a rolling end position to a rolling start position. An internally-fitting portion is formed at one end portion of the ball nut in the axial direction. When the outer periphery of the internally-fitting portion and the inner periphery of the cylindrical portion are fitted to each other, relative rotation of the ball nut and the piston is prevented. | 01-29-2015 |
20150033891 | BALL SCREW DEVICE - A ball screw device includes a screw shaft; a ball nut; a first deflector fitted to an end portion of the ball nut; a ball guide portion that guides balls positioned in a helical inner ball passage formed by the ball nut and the screw shaft, to a first end portion ball passage in the first deflector; the balls that are set to form a row extending in the inner ball passage and the first end portion ball passage; and a first elastic member having a base end that is positioned in the first end portion ball passage and a distal end that is disposed and accommodated in the first end portion ball passage so as to be able to contact the ball positioned at one end of the row of the balls. | 02-05-2015 |
20160076632 | BALL SCREW - The invention relates to a ball screw ( | 03-17-2016 |