Rolling Element Deflector Patents (Class 74/424.87)
  • Patent number: 11015688
    Abstract: A ball screw drive comprising a leadscrew that has at least one outer ball groove and comprising a threaded nut that has at least one inner ball groove, which ball grooves together to form a ball channel in which balls, via which the leadscrew is guided relative to the threaded nut, are accommodated, wherein in the ball groove of the threaded nut is provided at least one radially closed pocket in which a deflection element for deflecting the balls moving in the ball groove is accommodated, wherein the threaded nut has an outer deflection device, which outer deflection device is axially in front of the deflection element in the form of an individual deflection element, is situated on the outer side of the threaded nut and engages in two radial openings in the threaded nut, and by means of which outer deflection device the balls are axially offset.
    Type: Grant
    Filed: July 14, 2016
    Date of Patent: May 25, 2021
    Assignee: SCHAEFFLER TECHNOLOGIES AG & CO. KG
    Inventors: Mario Kreutzer, Gerd Sanewski, Nadine Kliemann
  • Patent number: 10989285
    Abstract: A screw device is provided which can facilitate management of a tolerance of a recess where a circulation component is housed. A circulation component is housed in a recess of a nut with clearance. At least part of the circulation component is blocked by a lid member fixed to the nut by fastening means. Upon a centrifugal force acting on a rolling element moving along a circulation path in the circulation component, the circulation component comes into contact at three points with the recess as viewed in an axial direction.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: April 27, 2021
    Assignee: THK CO., LTD.
    Inventors: Atsushi Suzuki, Kotaro Kawai
  • Patent number: 10935116
    Abstract: A seal member for a ball screw device, which is fixed to an axial end surface of a nut member of the ball screw device and is configured to seal a gap between the nut member and the screw shaft, the seal member including: a plurality of base plates which each have a through hole having an inner diameter larger than an outer diameter of the screw shaft; a spacer plate, which is sandwiched between two base plates adjacent to each other, and has a seal accommodation hole having an inner diameter larger than an inner diameter of a through hole of the base plates; and a seal plate, which has a shaft-fitting hole corresponding to a sectional shape of the screw shaft in a direction perpendicular to an axial direction, and is arranged in the seal accommodation hole of the spacer plates.
    Type: Grant
    Filed: January 5, 2018
    Date of Patent: March 2, 2021
    Assignee: THK CO., LTD.
    Inventors: Yuji Kubota, Futoshi Nakamura, Tetsuhiro Nishide, Kotaro Kawai, Bin Zhao, Tomoyuki Sugiyama
  • Patent number: 10801595
    Abstract: To provide a ball screw device and a steering device capable of securing smooth circulation of balls while suppressing occurrence of clogging of the balls caused by displacement in a radial direction between a deflector and a nut main body. A ball screw device includes a ball screw nut and a circulation path. The ball screw nut includes a nut main body and a deflector. The deflector includes an inclined portion provided at a peripheral part of a connection portion between a passage and the circulation path of the nut main body for securing passing of the balls at the connection portion when an insertion position of the deflector with respect to the deflector mounting hole is displaced from a desired position within a range of a given distance.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: October 13, 2020
    Assignee: JTEKT CORPORATION
    Inventors: Takuya Nakayama, Keisuke Ogawa
  • Patent number: 10697527
    Abstract: A ball screw and nut mechanism has a screw in cooperation with a nut via balls that can circulate in a raceway formed by the opposing threads of the screw and nut. The nut has a recirculation insert passing therethrough from the outer face to the thread, the recirculation insert having a first end with a ball transfer groove turned towards the screw. The mechanism has a holding body for holding the recirculation insert in the housing, the recirculation insert having a second end with a shoulder bearing on the nut, the second end of the recirculation insert having an orientation lug having an angular position predetermined and fixed relative to the ball transfer groove, the orientation lug cooperating with a guide relief of the holding body to fix an orientation of the recirculation insert such that the transfer groove is adjusted to the raceway.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: June 30, 2020
    Assignee: PELLENC (SOCIETE ANONYME)
    Inventors: Roger Pellenc, Philippe Gilbert
  • Patent number: 10612632
    Abstract: A ball screw structure with detection function includes a screw shaft having an external screw groove; a nut mounted to the screw shaft to be movable in an axial direction of the screw shaft and having an internal screw groove, which corresponds to the external screw groove of the screw shaft to define a loading channel between the internal screw groove of the nut and the external screw groove of the screw shaft; a ball assembly movable, through rolling, in the loading channel; and a recirculation member directly mounted to the nut and provided thereon with a microcontroller and a sensor to detect a rotation state of the screw shaft inside the nut and further formed with a recirculation passage in communication with the nut to allow the ball assembly to move and recirculate therethrough.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: April 7, 2020
    Assignee: HIWIN TECHNOLOGIES CORP.
    Inventors: Ying-Ju Lin, Chia-Ming Yang, Ping-Huan Hsieh, Min-Hsiu Wu
  • Patent number: 10507865
    Abstract: A steering apparatus includes a steering shaft; a steered shaft; a ball screw mechanism; and a motor. A plurality of rolling elements includes large-diameter rolling elements and small-diameter rolling elements. A prescribed diameter difference is set such that when a magnitude of power transmitted between a first screw groove and a second screw groove is a prescribed value or less, only the large-diameter rolling elements transmit the power between the first screw groove and the second screw groove, and when the magnitude of the power transmitted between the first screw groove and the second screw groove exceeds the prescribed value, both the large-diameter rolling elements and the small-diameter rolling elements transmit the power.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: December 17, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Masayoshi Asakura, Kiyoshi Uchiyama, Hirotsune Suzuki, Shunji Inoue, Hirokazu Kondo
  • Patent number: 10464593
    Abstract: An object of the present invention is to provide a power steering apparatus and a method of manufacturing a power steering apparatus that allow balls to smoothly travel in a connection member for circulating the balls. To achieve this object, a first curved portion of a first connection passage of a nut that faces a first bent portion of the connection member is formed into a curved shape in such a manner that a space between the first curved portion and the first bent portion is equal to or smaller than a predetermined value. Further, a second curved portion of a second connection passage of the nut that faces a second bent portion of the connection member is formed into a curved shape in such a manner that a space between the second curved portion and the second bent portion is equal to or smaller than a predetermined value.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: November 5, 2019
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Keisuke Kitamura, Tatsuyoshi Maruyama, Hiroyuki Sugiyama
  • Patent number: 10370897
    Abstract: A linear actuator extension assembly having a base housing, a driving member and a driven member having a housing. The driving member has a driving surface and a threaded lead screw disposed within the base housing. The driving surface is rotated about a first axis to actuate the threaded lead screw, thereby rotating the threaded lead screw about a second axis substantially orthogonal to the first axis. The rotation of the threaded lead screw translates the driven member housing relative to the base housing.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: August 6, 2019
    Assignee: Munchkin, Inc.
    Inventors: Thomas E. Birkert, Sung Yun Chan, Nicholas Trumbo
  • Patent number: 10215239
    Abstract: The present clutch operating device includes a drive motor and a speed reduction mechanism. The speed reduction mechanism includes a link bar receiving a driving force of the drive motor, a clutch lever that is rotatably coupled to a first end of the link bar while being disposed rotatably with respect to a second cover, and a main roller that is rotatably attached to a second end of the link bar while being disposed to roll on the second cover.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: February 26, 2019
    Assignee: EXEDY Corporation
    Inventors: Yasuhiko Eguchi, Hiroaki Kato
  • Patent number: 10208843
    Abstract: A linear motion assembly and recirculation insert therefor is provided. The assembly includes a ball nut having a through bore with an internal helical groove and a screw having an external helical groove. The external helical groove is radially aligned with the internal helical groove to define a plurality of ball raceways. A plurality of inserts is fixed within the bore of the ball nut. The inserts each have a central body fixed within a recessed pocket of the ball nut, with the body having a radially inwardly facing, generally s-shaped groove to route the balls between adjacent turns. A pair of legs extends in opposite directions from the central body, wherein the legs are sized for a clearance fit with the external helical groove. The legs merge with the central body over a smooth transition region that minimizes stress concentrations at the joint between the legs and central body.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: February 19, 2019
    Assignee: LINEAR MOTION, LLC
    Inventors: Mason E. Heck, Stephen R. Ahlers
  • Patent number: 10138985
    Abstract: In a multi-piece deflector for a ball screw mechanism, the positioning precision of a tongue with respect to a ball rolling passage can be improved, balls can be recirculated in a proper manner at all times, and damages to the tongue can be avoided. A deflector main body (40) which is fitted to the nut (7) is provided with a tongue (50) and a main body side ball guide groove (51) defining a part of a circular cross section, and a component piece (60) which is fitted to the deflector main body (40) is provided with a component piece side ball guide groove (68) defining a remaining part of the circular cross section.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: November 27, 2018
    Assignee: Kuroda Precision Industries Ltd.
    Inventor: Yoshimi Iwasaki
  • Patent number: 9970519
    Abstract: A circulation member positioning structure for a ball screw includes a nut and a circulation member. The nut has a threaded channel, a socket, and a positioning notch. The socket is provided on a wall of the threaded channel and the positioning notch is provided on a wall of socket. The circulation member has a circulation portion, a circulation track, and a positioning protrusion. The circulation portion is provided in the socket of the nut. The circulation track is distributed over one lateral of the circulation portion and connects with the threaded channel of the nut. The positioning protrusion is provided on an opposite lateral of the circulation portion for being engaged with the positioning notch of the nut. Thereby, the circulation member positioning structure helps to simplify the assembling work of the circulation member and to remain the nut small despite the insertion of the circulation member.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: May 15, 2018
    Assignee: HIWIN TECHNOLOGIES CORP.
    Inventors: Ming-Yao Lin, Yu-Hua Chen, Hui-Chen Chen, Tsung-Hsien Tsai
  • Patent number: 9573618
    Abstract: A ball screw includes a nut, a screw shaft, an end deflector attached to the nut, plural balls, and a pair of ball lifting portions. A spiral groove is formed at an outer peripheral surface in the screw shaft. The plural balls roll along the spiral groove. The pair of ball lifting portions is provided at the end deflector so as to interpose a width center of the spiral groove. The pair of ball lifting portions supports the balls by a first part of one of the pair of ball lifting portions and a second part of other of the pair of ball lifting portions being apart from each other in a width direction of the spiral groove so as to interpose the width center of the spiral groove between the first and second parts to thereby lift the balls from the spiral groove.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: February 21, 2017
    Assignee: SHOWA CORPORATION
    Inventor: Ryota Ito
  • Patent number: 9446788
    Abstract: A ball screw mechanism includes: a rack shaft, on the outer peripheral surface of which a spiral rack screw groove is formed; a cylindrical nut, on the inner peripheral surface of which a spiral nut groove that faces the rack screw groove is formed; and a plurality of balls disposed in a rolling passage that is a space surrounded by the rack screw groove and the nut groove. The nut is provided with: shift portions provided at both ends of the nut groove to shift the track of the nut groove in the axial direction of the rack shaft from the rack screw groove and to displace the nut groove to be deeper in the radial direction of the rack shaft as the track is shifted; a circulation passage that connects between the shift portions; and passage entrances that each connect between the shift portion and the circulation passage.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: September 20, 2016
    Assignee: JTEKT CORPORATION
    Inventor: Masashi Yamaguchi
  • Patent number: 9347536
    Abstract: 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.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: May 24, 2016
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Mario Kreutzer, Gerd Sanewski
  • Patent number: 9347534
    Abstract: 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.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: May 24, 2016
    Assignee: JTEKT CORPORATION
    Inventors: Satoshi Motoyama, Masashi Yamaguchi
  • Patent number: 9091336
    Abstract: 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.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: July 28, 2015
    Assignee: HIWIN TECHNOLOGIES CORP.
    Inventors: Ming-Yao Lin, Ming-Che Kuo
  • Patent number: 9010210
    Abstract: 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.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: April 21, 2015
    Assignee: Hiwin Technololgies Corp.
    Inventors: Yan-Yu Chen, Yung-Hsueh Lin
  • Patent number: 9003911
    Abstract: 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.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: April 14, 2015
    Assignee: NSK Ltd.
    Inventor: Kazunari Miyazaki
  • Patent number: 8984979
    Abstract: Ball screw assembly comprising a screw (2) provided with an outer thread (3); a nut (4) provided with an inner thread (5); a series (6) of balls (7) able to circulate along a circulating path (10) between the screw and the nut, along which the balls are engaged in the threads thereof; and recirculating means (8) defining a recirculating channel (9) to carry balls from one end to the other end of said circulating path (10); The recirculating channel (9) comprising a return channel (14) provided on the nut and, between the ends of this return channel and the corresponding ends of said circulating path, deflecting channels (27, 28) which are defined respectively between surfaces (25) of deflecting elements (20, 21) engaged in respective holes (11, 12) of the nut (4) and local zones (26) of surfaces (16) of these respective holes.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: March 24, 2015
    Assignee: Aktiebolaget SKF
    Inventors: Eric Allegri, Christophe Durand, Jerome Dubus, Romuald Lescorail
  • Patent number: 8950283
    Abstract: A method forms a concave constituting a ball return passage directly on an inner circumferential surface of a nut blank by plastic working without damaging a die. Letter S shaped concaves are formed on an inner circumferential surface of a nut blank, by pressing by use of a die having a blank holder, a cam driver, cam sliders, and a cylindrical member. The cam driver has inclined surfaces having the same angle of inclination as the cam sliders. The cam sliders have letter S shaped convexes corresponding to the letter S shaped concaves, and are held by through holes, respectively. When the cam driver is pressed from the top thereof, the cam sliders move outwardly in the radial direction, respectively, and the letter S shaped convexes push the inner circumferential surface of the nut blank for plastic deformation.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: February 10, 2015
    Assignee: NSK Ltd.
    Inventors: Atsushi Watanabe, Toru Harada, Shouji Yokoyama, Kiyoshi Ootsuka, Koji Hashimoto, Kazuto Kobayashi, Toshio Nakamura, Shinobu Mogi, Shingo Saitou, Tomofumi Yamashita
  • Publication number: 20150033891
    Abstract: 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.
    Type: Application
    Filed: July 29, 2014
    Publication date: February 5, 2015
    Inventors: Naoko SAKAGUCHI, Katsura KOYAGI
  • Publication number: 20150027258
    Abstract: 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.
    Type: Application
    Filed: July 18, 2014
    Publication date: January 29, 2015
    Inventors: Katsura KOYAGI, Akiyoshi TASHIRO, Naoko SAKAGUCHI
  • Publication number: 20140352472
    Abstract: 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.
    Type: Application
    Filed: May 28, 2013
    Publication date: December 4, 2014
    Inventor: WEN-YU HSIEH
  • Patent number: 8893574
    Abstract: 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.
    Type: Grant
    Filed: August 22, 2012
    Date of Patent: November 25, 2014
    Assignee: Hiwin Technologies Corp.
    Inventors: Hung-Sung Pan, Wen-Chia Wu
  • Patent number: 8863601
    Abstract: A ball screw device includes a screw engaged into a nut member for forming two or more endless ball guiding passages and for receiving a number of ball bearing members, the nut member includes two or more conduits and recesses communicative with the helical grooves of the nut member, two deflecting devices are attached to end portions of the nut member and each include an inner member attached to the nut member and having two or more pathways aligned with the recesses of the nut member, and an outer member attached to the inner member and coupled to the inner member with one or more radially extended protrusions for suitably guiding ball bearing members.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: October 21, 2014
    Assignee: Hiwin Technologies Corp.
    Inventors: Hsin Hua Chen, Jhe Kun Liou
  • Publication number: 20140290410
    Abstract: 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.
    Type: Application
    Filed: March 21, 2014
    Publication date: October 2, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Toshihiro ASAKURA, Tetsuya KANEKO, Satoshi FUJITA
  • Publication number: 20140251050
    Abstract: 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.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 11, 2014
    Applicant: HIWIN TECHNOLOGIES CORP.
    Inventors: Che Kang CHANG, Zong Sian JIANG
  • Patent number: 8800129
    Abstract: A spindle nut for a ball screw is provided, having a continuous ball track (1) for balls (2), a ball groove (3,14) for the balls (2) extending on an inner periphery of the spindle nut about the rotational axis thereof and along a helical line, the ball groove extending across at least one thread (4), and a diversion device (5), in order to divert with its diverting channel (9) balls (2) from one end of the thread (4) to the beginning of the thread (4). The spindle nut is provided with ball inlets (13, 16), on the one side connected to the ball groove (3, 14) and, on the other side connected to the diverting channel (9), with the ball groove (3, 14) and the ball inlet (13, 16) both having identical cross-sectional profiles.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: August 12, 2014
    Assignee: Schaeffler Technologies GmbH & Co. KG
    Inventors: Jurgen Osterlanger, Dieter Adler, Manfred Kraus, Ralf Mayer
  • Publication number: 20140174232
    Abstract: 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.
    Type: Application
    Filed: December 20, 2012
    Publication date: June 26, 2014
    Applicant: Hiwin Technologies Corp.
    Inventors: Yan-Yu CHEN, Wuteng HSIEH
  • Patent number: 8739646
    Abstract: There is provided a roller screw in which a twisted amount of an unloaded return path is reduced. The roller screw has a screw shaft 1 having a spiral roller-rolling surface 1a on an outer peripheral surface thereof; a nut 2 having a spiral loaded roller-rolling surface 2a on an inner peripheral surface thereof, the spiral loaded roller-rolling surface being opposed to the roller-rolling surface 1a of the screw shaft 1; a circulation member 7 arranged in the nut 2 and formed to have an unloaded return path 8 connecting one end and the other end of the loaded roller-rolling surface 2a, whose turn number is less than one, of the nut 2; and a plurality of rollers 4 arranged in a one-turn roller circulation path composed by a loaded roller-rolling path 6 and the unloaded return path 8.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: June 3, 2014
    Assignee: THK Co., Ltd.
    Inventors: Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Soshi Miyahara, Yusuke Todoroki, Takashi Sakuyama
  • Patent number: 8640564
    Abstract: This invention is revises the cap nut which the custom knows to suppose it to install trough's outline, will cause to install the dadoing to lead (lead angle to be small) lowly or on two above trundle ditch cap nut will not have the broken tooth's question, when will process should install the trough, only need use the face cutter then to process the forming, will reduce the production cost; And return circuit of this invention all establishes in the backflow part, therefore may promote and the cap nut supposes the backflow hole and the load way grade of fit, causes to roll the moving parts movement to be smoother, and reduces the noise production.
    Type: Grant
    Filed: December 29, 2009
    Date of Patent: February 4, 2014
    Assignee: Hiwin Technologies Corp.
    Inventor: Yu-Shan Lee
  • Patent number: 8584546
    Abstract: 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.
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: November 19, 2013
    Assignee: SMC Kabushiki Kaisha
    Inventors: Yoshihiro Fukano, Toru Sugiyama, Masaki Imamura
  • Publication number: 20130283953
    Abstract: In a ball screw (1), comprising a screw shaft (3), a nut (7) threaded onto the screw shaft via a plurality of balls (9) received in a raceway (8) defined between the two parts, an end deflector receiving recess (6) is formed on each axial end thereof to complementarily receive an end deflector (21) which defines a part of the raceway in cooperation with an opposing part of the nut, wherein the end deflector is provided with a pair of engagement claws (31, 32) that engage corresponding parts of the thread (4) formed on the nut. Thereby, the need for a special engagement feature or other arrangement for attachment is eliminated, and still a highly firm and accurate engagement is ensured between the nut and the end deflector.
    Type: Application
    Filed: April 19, 2013
    Publication date: October 31, 2013
    Applicant: Kuroda Precision Industries Ltd.
    Inventor: YOSHIMI IWASAKI
  • Patent number: 8544356
    Abstract: A fitting recess portion that connects fitting holes to each other is formed in a peripheral face of a ball screw nut. A circulation member includes a pair of fitted portions that are fitted in the fitting holes, and a connecting portion that provides communication between the fitted portions. A communication groove that has an opening on the fitted end side of the connecting portion and that extends in the axial direction is formed in the connecting portion. When the connecting portion is fitted in the fitting recess portion and the opening of the communication groove formed in the connecting portion is blocked by a bottom portion of the fitting recess portion, a second path that forms a return path together with first paths formed in the fitted portions is formed.
    Type: Grant
    Filed: February 9, 2010
    Date of Patent: October 1, 2013
    Assignee: JTEKT Corporation
    Inventors: Toshihiro Asakura, Takashi Hara
  • Patent number: 8534152
    Abstract: A deflector for use in a ball screw is composed of a main body and a junction member connected with the main body to form a channel having a first guide groove and two second guide grooves formed at two opposite sides of the first guide groove. Each of the second guide grooves has two walls extending outward from the first guide groove. Each two of the walls have a conjunction formed therebetween. The vertical section of the channel can define an extending axis passing through centers of the two conjunctions. At least one of the walls of each second guide groove is not parallel to the extending axis. In light of the above features, the roller chain can avoid wear and tear to prolong its service life thereof. Besides, the mold for forming the deflector can be designed to be structurally subject to mold release, such that the production efficiency can be increased.
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: September 17, 2013
    Assignee: Hiwin Technologies Corp.
    Inventors: Po-Chuan Hsu, Yan-Yu Chen
  • Publication number: 20130220047
    Abstract: 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.
    Type: Application
    Filed: March 31, 2011
    Publication date: August 29, 2013
    Applicant: NSK LTD
    Inventors: Shouji Yokoyama, Koji Hashimoto, Toru Harada, Shingo Saitou
  • Publication number: 20130220046
    Abstract: A ball screw device includes a screw engaged into a nut member for forming two or more endless ball guiding passages and for receiving a number of ball bearing members, the nut member includes two or more conduits and recesses communicative with the helical grooves of the nut member, two deflecting devices are attached to end portions of the nut member and each include an inner member attached to the nut member and having two or more pathways aligned with the recesses of the nut member, and an outer member attached to the inner member and coupled to the inner member with one or more radially extended protrusions for suitably guiding ball bearing members.
    Type: Application
    Filed: February 23, 2012
    Publication date: August 29, 2013
    Inventors: Hsin Hua Chen, Jhe Kun Liou
  • Patent number: 8505405
    Abstract: The ball screw apparatus includes a returning way L2 by mounting a circulating member 15 in mounted holes 16, 17 formed in the ball screw nut 13. The ball screw nut 13 includes a base portion 51 and an expanding portion 52. In the base portion 50 a distance from an axis center O1 of the rack shaft 3 to a bottom portion 14a of the nut side screw groove 14 is constant, and in the expanding portion 52 the distance is larger than that of the base portion 51. The expanding portion 52 includes a connecting area 34.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: August 13, 2013
    Assignee: JTEKT Corporation
    Inventors: Tetsuya Kaneko, Masayoshi Asakura, Takashi Hara
  • Patent number: 8408087
    Abstract: The present invention provides a screw device enabling insulation of sounds occurring from the inside of the screw device when circulating rolling elements.
    Type: Grant
    Filed: October 27, 2005
    Date of Patent: April 2, 2013
    Assignee: THK Co., Ltd.
    Inventors: Hidekazu Michioka, Hiroshi Niwa, Katsuya Iida, Yoshiaki Saitoh
  • Publication number: 20130068052
    Abstract: The ball screw system comprises a screw having an external threading, a nut having an internal threading and a series of balls being engaged in said threadings to link the screw and the nut, the nut comprising ball recirculation means comprising at least one ball deflection element inserted into a through hole of the wall of the nut, from outside to inside as far as abutment means, in which the nut is equipped with a retaining ring which bears on a peripheral wall of this nut, over at least a part of its length, and which bears permanently against the bottom of at least one groove formed on an external face of said deflection element and in which the retaining ring is engaged.
    Type: Application
    Filed: September 20, 2012
    Publication date: March 21, 2013
    Applicant: AKTIEBOLAGET SKF
    Inventor: Eric ALLEGRI
  • Publication number: 20130068058
    Abstract: 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.
    Type: Application
    Filed: September 20, 2012
    Publication date: March 21, 2013
    Applicant: AKTIEBOLAGET SKF
    Inventors: Eric ALLEGRI, Christophe DURAND
  • Publication number: 20130055839
    Abstract: 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.
    Type: Application
    Filed: August 22, 2012
    Publication date: March 7, 2013
    Inventors: Hung-Sung PAN, Wen-Chia Wu
  • Patent number: 8381607
    Abstract: A roller screw includes a long shaft, a screw nut sleeved onto the long shaft, and rollers, a turnaround member and a turnover member set in between the long shaft and the screw nut. The turnaround member enables the rollers to circulate. The turnover member defines a turnover passage extending over the peripheral surface of the long shaft and connected between two load paths in the long shaft and the screw nut to constitute a circulation path. The direction of arrangement of the rollers before entering the turnover passage is different from that after moving out of the turnover passage so that the amount ratio of the rollers that are arranged in two different directions is kept constant for industrial application.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: February 26, 2013
    Assignee: Hiwin Technologies Corp.
    Inventors: Jouns Liu, Wen-Chia Wu
  • Patent number: 8336416
    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.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: December 25, 2012
    Assignee: Hiwin Technologies Corp.
    Inventors: Yueh-Ling Chiu, Xin-He Chen
  • Patent number: 8336415
    Abstract: 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 1 having a spiral roller rolling surface 1a formed on an outer peripheral surface thereof; a nut 2 having a loaded roller rolling surface 2a formed in an inner peripheral surface thereof; a circulation member 3 having an unloaded return path connecting one end of the loaded roller rolling surface 2a of the nut 2 to an opposite end thereof; and a plurality of rollers 4 arranged in a loaded roller rolling path 6 and the unloaded return path.
    Type: Grant
    Filed: October 29, 2008
    Date of Patent: December 25, 2012
    Assignee: THK Co., Ltd.
    Inventors: Soshi Miyahara, Masahiko Yoshino, Lina Teng, Tsutomu Togashi, Takashi Sakuyama, Kentaro Nishimura, Tetsuya Miura, Akimasa Yoshida, Yusuke Todoroki
  • Publication number: 20120266702
    Abstract: Ball screw assembly comprising a screw (2) provided with an outer thread (3); a nut (4) provided with an inner thread (5); a series (6) of balls (7) able to circulate along a circulating path (10) between the screw and the nut, along which the balls are engaged in the threads thereof; and recirculating means (8) defining a recirculating channel (9) to carry balls from one end to the other end of said circulating path (10); The recirculating channel (9) comprising a return channel (14) provided on the nut and, between the ends of this return channel and the corresponding ends of said circulating path, deflecting channels (27, 28) which are defined respectively between surfaces (25) of deflecting elements (20, 21) engaged in respective holes (11, 12) of the nut (4) and local zones (26) of surfaces (16) of these respective holes.
    Type: Application
    Filed: April 17, 2012
    Publication date: October 25, 2012
    Applicant: AKTIEBOLAGET SKF
    Inventors: Eric Allegri, Christophe Durand, Jerome Dubus, Romuald Lescorail
  • Patent number: 8291786
    Abstract: A ball nut of a ball screw drive, in which the ball nut is mounted on a threaded spindle via balls. The ball nut has on its inner circumference a ball groove wound helically around an axis that extends over at least one winding, and a deflection body, with deflection ends, arranged on a circumferential face of the ball nut. The deflection ends engage into a recess of the ball nut, and adjoin an end and a start of the ball groove. The deflection body is supported on one side in radial directions and on the other side on a machine part. The deflection body is connected at its axial ends to bearings for mounting on the machine part. The bearings, which project circumferentially, engage into the recesses of the ball nut and are arranged with their bearing faces approximately flush with the outer circumferential face of the ball nut.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: October 23, 2012
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventors: Dieter Adler, Markus Stiegler, Markus Oswald
  • Patent number: 8291785
    Abstract: 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.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: October 23, 2012
    Assignee: Jtekt Corporation
    Inventors: Yoshifumi Shige, Katsura Koyagi, Atsushi Sakuta