Discrete Spacing Member Patents (Class 384/520)
  • Patent number: 9885385
    Abstract: A spacer device for roller elements of a toroidal roller bearing includes an inner ring and an outer ring. The toroidal roller bearing allows for axial and angular displacement between the inner and outer rings. The spacer device comprises a first roller element-contacting surface and a second roller element-contacting surface on opposite sides thereof. First and second roller-contacting surfaces are arranged to separate two adjacent roller elements in a tangential direction of the toroidal roller bearing when the spacer device is in use. Each of the first and second roller element-contacting surfaces has a concave shape adapted to conform to respective convex contacting surfaces of the roller elements. The spacer device comprises end members that have projections that extend outwards from first and second roller-contacting surfaces and which are arranged to extend at least partly over the ends of two adjacent roller elements when the spacer device is in use.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: February 6, 2018
    Assignee: AKTIEBOLAGET SKF
    Inventor: Arne Lars Jonas Kullin
  • Patent number: 9556908
    Abstract: An improved cage element for a cage arrangement in a rolling bearing assembly including rolling elements is provided. The cage element includes a cylindrical middle portion, a first end portion including a first concave outer surface shaped to support a rolling element, and a second end portion including a second concave outer surface shaped to support the rolling element. The first and second end portions are arranged on opposite ends of the cylindrical middle portion, and the first and second concave outer surfaces have identical curvatures.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: January 31, 2017
    Assignee: Schaeffler Technologies AG & Co. KG
    Inventor: Michael Heaton
  • Patent number: 9517713
    Abstract: A modular trailer vehicle is provided comprises a wheeled trailer chassis having a forward vehicle attachment, along with a rotatable cargo platform attached to the chassis for supporting cargo hauled thereon. The rotatable cargo platform is rotatably mounted to a hydraulically actuated turntable, which facilitates rotation of the platform from a position in alignment with the chassis to a position wherein the loading ramp is positioned off to the side of the trailer. The platform is capable of complete rotation about a central axis defined by the turntable center, wherein at least two hydraulic arms actuate the turntable, which supports the rotatably platform using a bearing assembly attached to the trailer chassis.
    Type: Grant
    Filed: August 26, 2013
    Date of Patent: December 13, 2016
    Inventor: Matthew Honigsberg
  • Patent number: 9238944
    Abstract: This invention relates to a tri-cone bit for high RPM drilling applications, which comprises three head sections and three cones. Cutting elements are arranged on each cone. Upper parts of the three head sections are joined together to form a bit body, on which nozzle sockets are provided, and nozzles are installed in bores of the nozzle sockets. A bearing between the cones and the head sections is a composite roller-journal bearing which is formed by rollers and arc-shaped slides arranged in an alternating way, and a seal means for the bearing is of metal face type. The composite roller-journal bearing of the invention can withstand high RPM and high load, and also has a higher resistance to impact, thereby ensuring longer working life of the bearing under high RPM and medium-high WOB. The six-point gage protection structure enhances stability of the bit and reduces cutting element breakage caused by bit vibration.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: January 19, 2016
    Assignee: Kingdream Public Ltd. Co.
    Inventors: Hongping Tian, Zengyuan Shao, Xiaobing Fan
  • Publication number: 20140153854
    Abstract: A rolling bearing which is capable of preventing the rolling elements from dropping out from between the inner and the outer rings even when the separators have been worn to an advanced stage. A rolling bearing includes: a plurality of rolling elements arranged between an inner and an outer rings; and a plurality of prismatic separators disposed in a circumferential direction between the rolling elements. The separator includes integrally therewith a metal band on at least one of its outer surfaces including those which face the inner or the outer ring, or at least one of its axial side surfaces, excluding however, surfaces which face the circumferential direction and make contact with the rolling elements. The metal band has a narrower width than a width of the separator in the circumferential direction, and prevents wear of the separator from advancing beyond a certain extent.
    Type: Application
    Filed: July 4, 2012
    Publication date: June 5, 2014
    Inventors: Miki Arihana, Naoaki Tsuji, Yoji Sato, Hideyuki Tsutsui, Kouya Oohira
  • Patent number: 8624455
    Abstract: A bearing change in an electrical motor and in particular a generator having permanent magnetic excitation should be able to be carried out safely. To this end, the invention relates to an electrical motor having a shaft (2) on which a rotor is mounted and a bearing unit (5) by means of which the shaft (2) is rotatably mounted. In addition, the electrical motor has a rotor support shield (1) to which the bearing unit (5) is fastened. Furthermore, the rotor support shield (1) is sized so as to be capable of supporting the shaft (2) when the bearing unit (5) is removed and seals a grease chamber (8) of the bearing unit (5) opposite the shaft (2). With the rotor support shield, a permanent magnet-equipped rotor can in particular be prevented from coming into contact with the stator when the bearing is removed.
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: January 7, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Daniel Friedl, Oliver Memminger
  • Publication number: 20130294716
    Abstract: A bearing for a hub-mounted vibration suppression system includes an outer ring defining a first outer race and a second outer race. A first inner ring and a second inner ring are disposed in the outer ring. A plurality of rolling elements is disposed between the first inner race and the first outer race. A slug separator separates each adjacent pair of the plurality of the rolling elements. Another plurality of rolling elements is disposed between the second inner race and the second outer race. Another slug separator separates each adjacent pair of the other rolling elements. Each of the plurality rolling elements have first centers that are spaced apart from one another by no more than 15 degrees and/or each of the plurality other rolling elements have second centers that are spaced apart from one another by no more than 15 degrees.
    Type: Application
    Filed: April 24, 2013
    Publication date: November 7, 2013
    Inventor: Alex Habibvand
  • Patent number: 8345386
    Abstract: A bearing device has a sleeve that encircles a shaft, and two side-by-side roller bearings rotatably support the sleeve coaxially on the shaft. A spacer portion protrudes radially inwardly from the sleeve and extends between the two roller bearings. The sleeve axially overlaps a minor portion of one roller bearing but does not overlap a race surface thereof, and the sleeve axially overlaps a major portion of the other roller bearing including a race surface thereof.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: January 1, 2013
    Assignee: Seiko Instruments (Thailand) Ltd.
    Inventors: Robert Gordon Smith, Virat Sornsiri
  • Patent number: 8267586
    Abstract: The metallic mold 90 includes a product configuration portion 93 formed between an upper mold 91 and a lower mold 92. This product configuration portion 93 is composed so that a rolling element accommodating belt 50 formed by this product configuration portion 93 can include spacer portions interposed between balls adjacent to each other in an infinite circulating passage and also include connecting arm portions for connecting the spacer portions to each other and so that the balls can be aligned in the alignment direction in the infinite circulating passage. The upper mold 91 has a splitting structure. In this splitting structure, a splitting position BL is set at a position passing through a position 91t for forming an end portion on the outer circumferential side in the inner and outer circumferential direction of the infinite circulating passage of the spacer portions 51.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: September 18, 2012
    Assignee: NSK Ltd.
    Inventor: Jun Matsumoto
  • Patent number: 8221003
    Abstract: A bearing unit has four rolling bearings adjacently disposed in an axial direction, each rolling bearing including an inner race, and outer race, and rolling elements interposed between the inner and outer races. A shaft is fitted to the inner races, and a sleeve has a fitting hole into which is fitted the outer races. The inner races or the outer races are brought into contract with each other in the axial direction to preload the rolling bearings. The inner races or the outer races of the rolling bearings at both axial ends, which are brought into contact with the inner races or the outer races of adjacent rolling bearings, are fixed to the sleeve, and the outer races of the central two rolling bearings form a radial gap between confronting surfaces of the sleeve and the outer races or between confronting surfaces of the shaft and the inner surfaces.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: July 17, 2012
    Assignee: Seiko Instruments (Thailand) Ltd.
    Inventors: Robert Gordon Smith, Virat Sornsiri
  • Patent number: 8215845
    Abstract: A tandem set of angular contact ball bearings each having an inner ring, an outer ring and balls therebetween, wherein each bearing contains balls that are spaced from each other by slug ball separators. A rotary wing aircraft rotor head assembly includes a rotor head member, a plurality of spindles attached to the head member at equal interval around the center of the head member, and a stack of ball bearings mounted on each spindle. Each bearing has an inner ring, an outer ring, and a plurality of balls between the inner ring and the outer ring, and slug ball separators between adjacent balls, and there is a mounting collar on the ball bearings.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: July 10, 2012
    Assignee: Roller Bearing Company of America, Inc.
    Inventor: Alex Habibvand
  • Patent number: 8021053
    Abstract: In a rotary wing aircraft tail rotor head assembly having a ball bearing on a spindle at the head of a rotor wing, the ball bearing contains slug ball separators between the balls in the bearing. The separator may be made from PEEK, PTFE, or polyimide. The ball-to-ball separation between two balls of like diameter provided by the separator may about 3.2 to about 64% of the diameter of one of the balls. A separator may have an annular configuration that defines a passage therethrough, the passage having two ends and the interior of the separator being tapered to define a maximum diameter at each end and a minimum diameter therebetween. The taper of the chamfered surface of the slug ball separator may define a conical angle of about 75° to about 120°. A ball bearing as described herein may also be used in a rotary wing aircraft swashplate having a stationary plate, a rotating plate; and a thrust bearing between the stationary plate and the rotating plate.
    Type: Grant
    Filed: February 8, 2007
    Date of Patent: September 20, 2011
    Assignee: Roller Bearing Company of America, Inc.
    Inventor: Alex Habibvand
  • Patent number: 8015894
    Abstract: An intelligent transmission element includes a first element formed in a strip shape and disposed with a slot therein; a second element disposed with a containing space for placing the first element, wherein the inner side of the containing space is disposed with a tank corresponding to the plurality of slots, the tank and the plurality of slots forms a loading path for disposing a plurality of rolling elements and a silencing element. The silencing element is placed between the plurality of rolling elements and contains a dye container for a dye. When the silencing element is damaged due to an external force, the dye inside the dye container of the silencing element would color the transmission element to let the user notice that the silencing element is damaged.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: September 13, 2011
    Assignee: HIWIN Technologies Corp.
    Inventors: Yi-Chyun Hwang, Chun-Lin Yu, Chung-Hsueh Lin
  • Patent number: 7963702
    Abstract: A roller bearing having spacers interposed between rollers is provided. During operation of the bearing, the spacers are prevented from being pressed by adjacent rollers against an inner ring or inner ring, so that heat generation and wear of the spacers at a guiding surface are reduced. The roller bearing includes an outer ring, an inner ring, a plurality of rollers, and a plurality of spacers interposed between adjacent rollers. Surfaces of each spacer that face respective rolling contact surfaces of the rollers each have a concave shape that extends across a pitch circle of the rollers, and the spacers are guided by one of the outer and inner rings. When each of the spacers is held between the adjacent rollers, a clearance is formed between the one of the outer and inner rings and the spacer.
    Type: Grant
    Filed: October 20, 2006
    Date of Patent: June 21, 2011
    Assignee: NTN Corporation
    Inventor: Takuya Ozu
  • Patent number: 7837391
    Abstract: A bearing retainer unit is formed by an insert-molding technique to cast a molded component of the bearing retainer unit utilizing a bearing bushing. A first mold die, having a circumferential surface shaped to correspond to at least a portion of the inner circumferential surface of a bearing-positioning portion of the molded component, and a second mold die, having an abutment that abuts against an axial end face of the first die, are readied. A molten material is then injected into the mold to form the molded part, thereby forming the die-parting line on the inner circumferential surface of the component's bearing positioning portion, positioned at the radially outer side of the abutment.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: November 23, 2010
    Assignee: Nidec Corporation
    Inventors: Hideaki Kitamura, Takahiro Kikuichi, Fumihiro Umeda, Yoshihisa Kato, Koji Ando
  • Patent number: 7493837
    Abstract: A ball screw unit has a plurality of partition-rooms each of them accommodating a spacer ball interposed between two load carrying balls. The partition room is formed into two oblique frustum shaped recesses each of them extends a flared mouth tilted downwards to the longitudinal axis of the ball screw unit. The partition room is made of elastic polymer material to facilitate pushing the spacer ball into an oblate ellipsoidal hole opened on the partition room, and the hole is also communicated with the two recesses. With this structure, the spacer balls can be held stably in the partition rooms without the fear of escaping or occurrence of disorganized ball squeezing during operation of the ball screw unit. Besides, the dimension of spacer ball may be made as small as possible so as to increase the number of load carrying balls thereby resulting in improvement of load carrying capability of the structure.
    Type: Grant
    Filed: August 26, 2005
    Date of Patent: February 24, 2009
    Assignee: Hiwin Technologies Corp.
    Inventors: Wen-Chia Wu, Yuh-Siang Lin
  • Patent number: 7458722
    Abstract: A spacer contains a magnetic filler and is disposed between the magnetic conductive balls. The magnetic filler produces an indirect magnetic attractive force on the balls, therefore, when the interval between the two neighboring balls is overlarge, the spacer will not tip over under the effect of gravity or centrifugal force, but will be adsorbed on the balls by the magnetic filler.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: December 2, 2008
    Assignee: Hiwin Technologies Corp.
    Inventors: Yan-Yu Chen, Kenny Lin, Wen-Chia Wu
  • Patent number: 7444747
    Abstract: An improved roller assembly for use in machinery such as round balers is disclosed. The roller assembly of the present invention reduces sensitivity to varying dimensional tolerances on the roller assembly and the structure to which the roller assembly is mounted. At least one elastic member is used to permit the axial position of at least one of the bearings on the roller assembly shaft to vary. Spring washers provide a predetermined, axial force to at least one of the bearings.
    Type: Grant
    Filed: October 14, 2004
    Date of Patent: November 4, 2008
    Assignee: Vermeer Manufacturing Company
    Inventors: William A. Hood, Calvin D. Meinders, Scott A. Rempe
  • Patent number: 7380334
    Abstract: A clamping device (1) for receiving and for the clearance-free prestressing of a wheel bearing comprises a clamping mechanism (3) which radially prestresses the wheel bearing (8) from the outside.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: June 3, 2008
    Assignee: FAG Kugelfischer AG
    Inventors: Lothar Ulmann, Karl Bywalez
  • Patent number: 7159484
    Abstract: A linear motion device includes an inner member and an outer member cooperatively forming a ball circulating path therebetween, a plurality of balls rollably disposed in the ball circulating path, and a plurality of retaining pieces interposed between the balls, wherein the ratio of a ball-to-ball direction force applied to the retaining piece by the balls disposed at the both sides thereof to the elastic displacement of the retaining piece by the force is adjusted to a range of from 0.1 to 10 [N/?m] from 0.1 to 10 [N/?m] by predetermining a bore diameter of a through-hole formed at the central portion of the retaining piece to a range of from 35% to 65% of a diameter of the ball.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: January 9, 2007
    Assignee: NSK Ltd.
    Inventor: Tsutomu Ohkubo
  • Patent number: 7044016
    Abstract: A ball screw having: a screw shaft having a spiral ball rolling groove; a ball nut having a ball rolling groove corresponding to the ball rolling groove; and a large number of balls interposed between the ball rolling grooves so as to roll freely; wherein the ball rolling groove of at least one of the screw shaft and the ball nut is ground so that a maximum value component of a number of undulation peaks per lead in the ball rolling groove is not in a range of from 0.95 nm to 1.05 nm centered on an integral multiple nm of a number m of load balls per lead calculated by an expression: ( ? ? ? d m ) 2 + L 2 P in which P is a distance between centers of the adjacent load balls disposed at substantially equal intervals in the ball rolling groove, dm is a ball pitch circle diameter, and L is a lead.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: May 16, 2006
    Assignee: NSK Ltd.
    Inventor: Toshiharu Kajita
  • Patent number: 7036391
    Abstract: A protruding section facing a drive pinion shaft is integrally provided on (or provided as a separate component) a tubular spacer interposed between an inner race of a pilot bearing and an inner race of a tapered roller bearing at an inner section opposite to the drive pinion shaft. In one embodiment, a monolithic protruding section is curved so as to be convex along the overall central axial direction of the spacer, and is arch shaped in cross section. The protruding section protrudes towards the drive pinion shaft along the overall inner peripheral direction of the spacer, and the inner surface of the protruding section comes into contact with or close to the outer surface of the drive pinion shaft. Additional positions include one or a plurality of O-rings interposed between the drive pinion shaft and the inner surface of the tubular spacer.
    Type: Grant
    Filed: March 6, 2002
    Date of Patent: May 2, 2006
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Kenichi Tsuchiya, Seiji Habara
  • Patent number: 6955468
    Abstract: A linear-motion device has: a linear-motion element fitted on a shaft which moves straight along the shaft; a plurality of balls which are retained in a ball groove formed on the inner side of the linear-motion element and roll over between the ball groove and the shaft; a separator interposed between the balls; and, a circulating path formed in the linear-motion element through which the balls are circulated from one end of the ball groove to the other, which is filled with a grease, wherein the separator is a formed product comprising as a resin component a polybutylene naphthalate-based elastomer formed by a hard segment made of a polybutylene naphthalate and a soft segment made of a polycondensate of 2,6-naphthalanedicarboxylic acid with a polytetramethylene ether glycol.
    Type: Grant
    Filed: November 8, 2002
    Date of Patent: October 18, 2005
    Assignee: NSK.Ltd.
    Inventors: Toshikazu Yabe, Soichiro Kato, Hiroki Yamaguchi, Tatsunobu Momono, Juntaro Sahara, Hirotoshi Aramaki
  • Patent number: 6892596
    Abstract: A rolling element interference preventer for a guide device prevents a number of rolling elements rolling at regular intervals in a continuous circulation path of the guide device from interfering with each other. The rolling element interference preventer is formed of a thermoplastic resin elastomer having a physical property in accordance with an expression, (A×B)÷C?18, where A represents a 10% elongation stress, B represents a tensile strength, and C represents a bending modulus of elasticity.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: May 17, 2005
    Assignee: GHK Co., Ltd.
    Inventors: Hidekazu Michioka, Katsuya Iida, Tomozumi Murata, Yoshiyuki Honjyo
  • Patent number: 6821604
    Abstract: In a retaining piece interposed between the adjacent rolling balls, a concave surface of each of both side surfaces of the retaining piece where it contacts with the spherical surfaces of the balls is configured to partly contact with the spherical surface of the ball. The concave surface includes a linear contact portion to be in contact with the ball and an approximate curved surface having the radius of curvature approximate to that of the ball, which is located on the inner side of the linear contact portion. In addition, recesses which are joined to the gate portion and the ejector pin in a molding process are formed in the concave surfaces. A recess is formed at the joining portion or near a parting line. Fins formed in the molding process are capable to be put into the recess.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: November 23, 2004
    Assignee: NSK Ltd.
    Inventors: Shinichi Kasuga, Ryoichi Sato, Hiroki Yamaguchi
  • Patent number: 6794015
    Abstract: In a retaining piece interposed between the adjacent rolling balls, a concave surface of each of both side surfaces of the retaining piece where it contacts with the spherical surfaces of the balls is configured to partly contact with the spherical surface of the ball. The concave surface includes a linear contact portion to be in contact with the ball and an approximate curved surface having the radius of curvature approximate to that of the ball, which is located on the inner side of the linear contact portion. In addition, recesses which are joined to the gate portion and the ejector pin in a molding process are formed in the concave surfaces. A recess is formed at the joining portion or near a parting line. Fins formed in the molding process are capable to be put into the recess.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: September 21, 2004
    Assignee: NSK Ltd.
    Inventors: Shinichi Kasuga, Ryoichi Sato, Hiroki Yamaguchi
  • Patent number: 6699568
    Abstract: In a retaining piece interposed between the adjacent rolling balls, a concave surface of each of both side surfaces of the retaining piece where it contacts with the spherical surfaces of the balls is configured to partly contact with the spherical surface of the ball. The concave surface includes a linear contact portion to be in contact with the ball and an approximate curved surface having the radius of curvature approximate to that of the ball, which is located on the inner side of the linear contact portion. In addition, recesses which are joined to the gate portion and the ejector pin in a molding process are formed in the concave surfaces. A recess is formed at the joining portion or near a parting line. Fins formed in the molding process are capable to be put into the recess.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: March 2, 2004
    Assignee: NSK Ltd.
    Inventors: Shinichi Kasuga, Ryoichi Sato, Hiroki Yamaguchi
  • Patent number: 6692814
    Abstract: In a retaining piece interposed between the adjacent rolling balls, a concave surface of each of both side surfaces of the retaining piece where it contacts with the spherical surfaces of the balls is configured to partly contact with the spherical surface of the ball. The concave surface includes a linear contact portion to be in contact with the ball and an approximate curved surface having the radius of curvature approximate to that of the ball, which is located on the inner side of the linear contact portion. In addition, recesses which are joined to the gate portion and the ejector pin in a molding process are formed in the concave surfaces. A recess is formed at the joining portion or near a parting line. Fins formed in the molding process are capable to be put into the recess.
    Type: Grant
    Filed: December 12, 2002
    Date of Patent: February 17, 2004
    Assignee: NSK Ltd.
    Inventors: Shinichi Kasuga, Ryoichi Sato, Hiroki Yamaguchi
  • Patent number: 6565947
    Abstract: In a retaining piece interposed between the adjacent rolling balls, a concave surface of each of both side surfaces of the retaining piece where it contacts with the spherical surfaces of the balls is configured to partly contact with the spherical surface of the ball. The concave surface includes a linear contact portion to be in contact with the ball and an approximate curved surface having the radius of curvature approximate to that of the ball, which is located on the inner side of the linear contact portion. In addition, recesses which are joined to the gate portion and the ejector pin in a molding process are formed in the concave surfaces. A recess is formed at the joining portion or near a parting line. Fins formed in the molding process are capable to be put into the recess.
    Type: Grant
    Filed: January 9, 2001
    Date of Patent: May 20, 2003
    Assignee: NSK Ltd.
    Inventors: Shinichi Kasuga, Ryoichi Sato, Hiroki Yamaguchi
  • Patent number: 6513978
    Abstract: The present invention provides rolling element spacers used in a rolling guide unit provided with an endless circulating passage for balls; arranged with plural balls alternately therewith in the endless circulating passage; and circulated with these balls in the endless circulating passage. Each of the rolling element spacers has a pair of retaining seats which the balls contact, and is formed so that, on a ball cutting plane perpendicular to the center of rotation of each ball, each retaining seat and a relative ball contact each other at only the two portions of the retaining seat that are in the vicinity of both ends thereof.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: February 4, 2003
    Assignee: THK Co., Ltd.
    Inventors: Takeki Shirai, Hiroshi Niwa, Kentarou Nishimura, Yasuyuki Abe, Kiyomi Tamura
  • Publication number: 20020110297
    Abstract: A roller chain incorporating the roller bearings wherein a plurality of rollers are disposed between a roller that functions as an outer ring and a bush that functions as an inner ring comprises a substantially ring-shaped retainer disposed on both ends of the roller respectively. The retainer includes a plurality of pockets for guiding at least a part of each of the rollers on the inner side of the retainer.
    Type: Application
    Filed: February 8, 2002
    Publication date: August 15, 2002
    Inventor: Tomoyuki Saji
  • Patent number: 6431760
    Abstract: An angular type ball bearing according to the present invention secures good property of lubricating a shaft to be supported by the ball bearing while reducing the manufacturing cost thereof, thereby being able not only to reduce the temperature rise of the bearing as well as the required rotation torque of the shaft to be supported but also to enhance the running accuracy of the shaft to be supported. The anti-load-side end portions of the outer rings 32 of the bearings 30 are respectively situated nearer to balls 37 arranged along the axial direction of a shaft to be supported by the bearings 30 than the load-side end portions of the inner rings 31 of the bearings 30. The width-direction dimensions of the outer rings 32 are formed smaller than the width-direction dimensions of the inner rings 31.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: August 13, 2002
    Assignee: NSK Ltd.
    Inventors: Taikou Nawamoto, Hideto Yui
  • Patent number: 6415676
    Abstract: A ball screw device utilizes spacers having concave ball-contacting surfaces with distributed protrusions or dimples. Balls having needle-like recesses may also be used. The spacers are provided in two thicknesses, and the relative numbers of the thinner and thicker spacers are selected in order to ensure retention of the spacers in their proper positions, while providing a small clearance between the balls and spacers to avoid fluctuations or sharp increases in dynamic torque.
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: July 9, 2002
    Assignee: Tsubaki Nakashima Co., Ltd.
    Inventors: Hirouyki Takagi, Hidemi Horimoto, Soichiro Ohga
  • Patent number: 6352367
    Abstract: A spacer for a linear motion apparatus is to be interposed alternately between balls arranged in an endless circulation passage of the linear motion apparatus. The spacer has a body portion comprising spherical retaining surface portions formed for supporting the balls on both end portions thereof in an advancing direction of the spacer when moving in the endless circulation passage and a circumferential surface portion constituting an outer peripheral portion of the spherical retaining surface portions. The spherical retaining surface portion has a radius of curvature smaller than a diameter of the ball and the circumferential surface portion is provided with a groove extending in the circumferential direction thereof so that one of the spherical retaining surface portions is elastically deformable towards another one thereof. The spacer is preferably applicable to various kinds of linear motion apparatus. Further, rollers as rolling members may be utilized in place of the balls.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: March 5, 2002
    Assignee: THK Co., LTD
    Inventors: Masashi Konomoto, Hidekazu Michioka
  • Patent number: 6260681
    Abstract: A hub transmission mechanism includes an axle inserted coaxially into a through-hole in a spoke-mounting barrel such that a right axle portion thereof extends outwardly from the spoke mounting barrel. A sprocket mounting member is sleeved around the right axle portion, and includes an outer shell coupled with a right end of the spoke-mounting barrel, left and right bearing units disposed within the outer shell, a tubular sleeve disposed within the outer shell around the right axle portion and between the bearing units, and a restricting spacer unit disposed within the outer shell and cooperating with the tubular sleeve to restrict radial and axial displacement of the bearing units relative to the outer shell, thereby defining an aligned bore for smooth extension of the right axle portion of the axle during assembly.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: July 17, 2001
    Assignee: Kun Teng Industry Co., Ltd.
    Inventor: Hubert Chen
  • Patent number: 6149307
    Abstract: A relatively movable unit with rolling elements, or balls, adapted for use in a linear motion guide unit or a ball nut screw assembly. The relatively movable unit has lubricating rings disposed between any adjoining balls to thereby lubricate the balls. In the linear motion guide unit employing this relatively movable unit, the balls are confined in raceways at the interfaces between a track rail and a slider, while the lubricating ring is arranged between the adjoining balls. The lubricating ring is provided therein with spherical pockets opened to each other through a window at the center of the ring. The lubricating ring may be produced by forming a mixture of lubricant of turbine oil with resinous material of ultrahigh molecular weight polyethylene powder in a mold under pressure, and heating the molded mixture under pressure.
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: November 21, 2000
    Assignee: Nippon Thompson Co., Ltd.
    Inventors: Akihiko Kamimura, Shigemasa Itabashi
  • Patent number: 6129454
    Abstract: A single-piece outer race ring 3, a sleeve-like spacer 11, a plurality of first balls 4, a conventional ball bearing unit 7, a stepped-diameter shaft 1 and the like are assembled into a compound bearing assembly by a bearing maker with high accuracy to enable a user to be free from a cumbersome assembling work of rotating portions or cylindrical rotary shaft and its bearing means of a computer and its peripheral devices. In use, the compound bearing assembly is coaxially mounted in the cylindrical rotary shaft and the like at the user's end to rotatably support the cylindrical rotary shaft and the like in the computer and its peripheral devices.
    Type: Grant
    Filed: December 28, 1999
    Date of Patent: October 10, 2000
    Assignee: Minebea Kabushiki-Kaisha
    Inventor: Rikuro Obara
  • Patent number: 6033120
    Abstract: A compound bearing assembly for a swing arm of a hard disc drive is disclosed, which comprises a stepped shaft 1 having a large-diameter portion and a small-diameter portion 1b, the large-diameter portion 1a having an inner raceway groove 2a directly formed in the outer periphery, a distinct-component outer race ring 3 disposed around the large-diameter portion 1a and having an outer raceway groove 2b formed in the inner periphery, a plurality of balls provided between the inner and outer raceway grooves 2a and 2b, a ball bearing unit 5 having an inner and an outer race ring 5a and 5b and a plurality of balls 6 provided therebetween, the inner race ring 5a being fitted on the small-diameter portion 1b of the stepped shaft, and a sleeve-like spacer 1 between the distinct-component outer race ring 3 and the outer race ring 5b of the ball bearing unit 5 and having opposite end small-diameter portions, on which the outer race rings 3 and 5b are fitted, respectively.
    Type: Grant
    Filed: October 24, 1996
    Date of Patent: March 7, 2000
    Assignee: Minebea Kabushiki-Kaisha
    Inventor: Rikuro Obara
  • Patent number: 6012226
    Abstract: A single-piece outer race ring 3, a sleeve-like spacer 11, a plurality of first balls 4, a conventional ball bearing unit 7, a stepped-diameter shaft 1 and the like are assembled into a compound bearing assembly by a bearing maker with high accuracy to enable a user to be free from a cumbersome assembling work of rotating portions or cylindrical rotary shaft and its bearing means of a computer and its peripheral devices. In use, the compound bearing assembly is coaxially mounted in the cylindrical rotary shaft and the like at the user's end to rotatably support the cylindrical rotary shaft and the like in the computer and its peripheral devices.
    Type: Grant
    Filed: August 20, 1998
    Date of Patent: January 11, 2000
    Assignee: Minebea Kabushiki-Kaisha
    Inventor: Rikuro Obara
  • Patent number: 6000855
    Abstract: An outer ring spacer for use in a double row rolling bearing unit fitted onto a shaft and comprising inner rings externally secured to the shaft having a pair of spaced apart inner ring raceways, a pair of outer rings having an inner peripheral face formed with outer ring raceways facing respective inner ring raceways, and a plurality of rolling elements provided between the inner ring raceways and outer ring raceways, the outer ring spacer fitted between the outer rings, and comprising a cylindrical spacer body formed with axially opposite parallel end faces abutted against the mutually facing end faces of the outer rings, and a displacement prevention ring internally secured to one axial end of the spacer body, and having a portion protruding from one of the parallel end faces of the spacer body so as to be engaged with the inner peripheral surface of one end portion of the outer rings to prevent the spacer body from being displaced radially.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: December 14, 1999
    Assignee: NSK Ltd.
    Inventor: Seizo Miyazaki
  • Patent number: 5927858
    Abstract: In this linear motion rolling guide unit, separators of different thicknesses are interposed between adjacent rolling elements so that the rolling elements are arranged in an unequally spaced manner, whereby the vibrations and noises, which are ascribed to regular rolling of the rolling elements, are minimized, the early wear in a casing and end caps being thereby prevented. The rolling elements roll in rolling element circulating passages comprising raceways formed between raceway surfaces of a track rail and the casing, direction changing passages formed in the end caps, and return passages formed in the casing. Among the rolling elements, separators 30 formed to unequal thickness are provided. When an excessively large load is imparted to the rolling elements, impressions occurs at irregular intervals in the raceway surfaces, so that the rolling elements do not simultaneously fit in the irregularly spaced impressions while the slider is moved.
    Type: Grant
    Filed: April 1, 1998
    Date of Patent: July 27, 1999
    Assignee: Nippon Thompson Co., Ltd.
    Inventor: Norimasa Agari
  • Patent number: 5808388
    Abstract: A first outer race ring 3, a sleeve-like spacer 7, a plurality of first balls 4, a conventional ball bearing unit 5 and a stepped-diameter shaft 1 are assembled into a compound bearing assembly by a bearing maker to enable a user or motor manufacturer to be free from a cumbersome assembling work of the bearing assembly. Consequently, upon receipt of the bearing assembly, the motor manufacturer may immediately mount the bearing assembly in a central hub portion of a rotor of the motor in an insertion manner to complete his product, i.e., high-performance motor.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: September 15, 1998
    Assignee: Minebea Kabushiki-Kaisha
    Inventor: Rikuro Obara
  • Patent number: 5800069
    Abstract: A single-piece outer race ring 3, a sleeve-like spacer 11, a plurality of first balls 4, a conventional ball bearing unit 7, a stepped-diameter shaft 1 and the like are assembled into a compound bearing assembly by a bearing maker with high accuracy to enable a user to be free from a cumbersome assembling work of rotating portions or cylindrical rotary shaft and its bearing means of a computer and its peripheral devices. In use, the compound bearing assembly is coaxially mounted in the cylindrical rotary shaft and the like at the user's end to rotatably support the cylindrical rotary shaft and the like in the computer and its peripheral devices.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: September 1, 1998
    Inventor: Rikuro Obara
  • Patent number: 5785432
    Abstract: An outer ring spacer for use in a double row rolling bearing unit fitted onto a shaft and comprising inner rings externally secured to the shaft having a pair of spaced apart inner ring raceways, a pair of outer rings having an inner peripheral face formed with outer ring raceways facing respective inner ring raceways, and a plurality of rolling elements provided between the inner ring raceways and outer ring raceways, the outer ring spacer fitted between the outer rings, and comprising a cylindrical spacer body formed with axially opposite parallel end faces abutted against the mutually facing end faces of the outer rings, and a displacement prevention ring internally secured to one axial end of the spacer body, and having a portion protruding from one of the parallel end faces of the spacer body so as to be engaged with the inner peripheral surface of one end portion of the outer rings to prevent the spacer body from being displaced radially.
    Type: Grant
    Filed: February 26, 1997
    Date of Patent: July 28, 1998
    Assignee: NSK Ltd.
    Inventor: Seizo Miyazaki
  • Patent number: 5655846
    Abstract: A bearing assembly, and method of assembling same, including a stepped-diameter shaft, a first outer race ring being disposed around a raceway groove directly formed in the large diameter portion, a second bearing outer race and an inner race ring mounted on the small diameter portion of the shaft, and a sleeve-like spacer provided with a pair of small diameter portions in its opposite axial end portions each fitted into in the respective first and second outer races.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: August 12, 1997
    Assignee: Minebea Kabushiki-Kaisha
    Inventor: Rikuro Obara
  • Patent number: 5356227
    Abstract: A solid-lubricated bearing assembly has an outer bearing member with a generally radially inwardly facing race surface formed therein adapted to receive rotatable bearing elements for rotating motion of the rotatable bearing elements respecting the outer bearing member, an inner bearing member having a generally radially outwardly facing race surface formed therein adapted to receive the rotatable bearing elements for rotating motion of the rotatable bearing elements respecting the inner bearing member, a plurality of rotatable bearing elements retained between the race surfaces of the inner and outer bearing members, and at least one spacer circumferentially positioned between the bearing elements for maintaining the bearing elements in spaced relation to one another while permitting rotation of the bearing elements in the races with the spacer including solid lubricant material for depositing a solid lubricant film on the rotatable elements by contact therewith as the rotatable elements rotate against the s
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: October 18, 1994
    Assignee: Tribology Systems, Inc.
    Inventors: Lewis B. Sibley, C. Brian Kelly
  • Patent number: 4761820
    Abstract: An elastic spacer to be inserted between adjacent balls of a ball bearing and having recesses on its faces turned toward the balls into which the balls partially engage, characterized in that the spacer (1) has an outer contour (3) that can be inscribed in a cylinder and its length (L) corresponds to at least one half the diameter of the ball and has in its bore a conical partition (4) which, at least in its central region contiguous to the cone tip (5), is subdivided into elastically resilient tongues (7) by slots (6) extending approximately radially, one ball (2) making approximately punctiform contact in the center and the other ball (2) abutting on the partition (4) in a contact circle.
    Type: Grant
    Filed: September 10, 1987
    Date of Patent: August 2, 1988
    Assignee: INA Walzlager Schaeffler KG
    Inventors: Hubertus Frank, Andreas Nagengast
  • Patent number: 4588313
    Abstract: A four-point contact bearing with the largest possible pressure angles and suitable for rotary and swinging movements is disclosed. The rim gaps on both sides of the balls are extremely narrow and offset radially with respect to each other. The cage is segmented and the segments have guide straps which are also offset with respect to each other and extend into the rim gaps.
    Type: Grant
    Filed: January 17, 1984
    Date of Patent: May 13, 1986
    Assignee: FAG Kugelfischer Georg Schafer KGaA
    Inventors: Bernhard Knappe, Erwin Gerber
  • Patent number: 4505523
    Abstract: The prestressed rolling bearing device comprises a cage for guiding and/or retaining a plurality of rolling elements. At least one of the rolling elements has an outside diameter larger than that of the other rolling elements. The rolling element of larger diameter is formed by a ball and the other rolling elements are cylindrical elements.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: March 19, 1985
    Assignee: Nadella
    Inventor: Gerard Stephan