Gearing Patents (Class 74/640)
  • Patent number: 9746065
    Abstract: The addendum tooth profile of the inner teeth and outer teeth of a strain wave gearing is stipulated by a first and second similar curve obtained from the curve segment from an inflection point to a low point in a movement trajectory when the meshing of both teeth is approximated by rack meshing. The addendum tooth profile of the inner teeth is stipulated by a curve generated at the inner teeth in the process of the addendum profile of the outer teeth moving from the inflection point to the apex of the movement trajectory. The addendum tooth profile of the outer teeth is stipulated by a curve generated at the outer teeth when the addendum profile of the inner teeth moves from the inflection point to the apex. The addendum profile of the outer teeth makes double contact with the addendum profile and dedendum profile of the inner teeth.
    Type: Grant
    Filed: November 29, 2013
    Date of Patent: August 29, 2017
    Assignee: HARMONIC DRIVE SYSTEM INC.
    Inventor: Shoichi Ishikawa
  • Patent number: 9714699
    Abstract: A harmonic drive includes a rigid internal gear, a flexible external gear meshed with the rigid internal gear, and a wave generator abutted against the flexible external gear. Through a special parameter setting to design the outer peripheral edge of the wave generator in a surface of variable curvature, the contact area between the wave generator and the flexible external gear is increased to improve fretting wear, thereby enhancing transmission accuracy and reducing hysteresis error.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: July 25, 2017
    Assignee: Hiwin Technologies Corp.
    Inventors: Yi-Hung Tsai, Fung-Ling Nian
  • Patent number: 9677657
    Abstract: Exemplary embodiments of the invention are directed to drive mechanisms that may be used in, for example, power transmission and/or speed reduction applications. Exemplary embodiments of the invention may include a housing within which is located a wheel. A portion of a wave generator and a portion of an output element also reside within the chamber and are in communication with the wheel. Rotation of the wave generator causes a rotation of the wheel in a slipping manner and, thus, with a reduced rotational speed. Rotation of the wheel causes a rotation of the output element.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: June 13, 2017
    Assignee: Spectrum Diversified Designs, LLC
    Inventor: Yuan F. Zheng
  • Patent number: 9644728
    Abstract: First and second external tooth gear parts of a strain wave gearing are bent in an elliptic shape by a wave generator to engage with first and second internal tooth gears, respectively. The first and second external tooth gear parts are bent so as to have elliptic shapes the phases of which are rotated 90 degrees from each other about a rotational center line. A coupling external tooth gear part that maintains a circular cross-sectional shape which does not deform is formed in between the first and second external tooth gear parts. The coupling external tooth gear part is maintained so as to be coupled with a coupling internal tooth gear in an engaged manner. The strain wave gearing has high engagement rigidity and is capable of transmitting large torque.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: May 9, 2017
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventors: Tatsuro Hoshina, Masakatsu Sasahara
  • Patent number: 9605742
    Abstract: A strain wave gearing speed changing apparatus has a coaxial pair of circular splines including a first with tooth number TA and a second with TD. A coaxial pair of flex splines includes a first with tooth number TB and a second with TC. First flex spline meshes first circular spline and second flex spline meshes second circular spline at two, preferably more, meshing engagements. A wave generator is connected to one of the input and output shafts. Two flex splines are fixed together to operate flexingly on the wave generator with equal spline tooth engagement pitch circle circumference lengths. One circular spline is fixed to the apparatus frame and the other is connected to the other of the input and output shafts not connected to the wave generator. The four splines satisfy TA=TK+Ti, TB=TK, TC=TK?Tj and TD=TK+Ti?Tj.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: March 28, 2017
    Inventor: Panchien Lin
  • Patent number: 9523421
    Abstract: A hollow-type strain wave gearing unit has a cup-shaped flexible externally-toothed gear, in which one shaft end portion of a hollow rotation shaft of a wave generator is located. The shaft end portion is supported by a bearing mounted on a bearing holder fixed to a boss of the flexible externally-toothed gear. The bearing holder has a retainer holding portion to prevent a retainer of a wave generator bearing from coming off in the axis line direction. There is no need to dispose a retainer holding plate of the wave generator bearing inside the flexible externally-toothed gear, whereby the axial length of the hollow-type strain wave gearing unit can be reduced.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: December 20, 2016
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventors: Yuya Murayama, Yoshihide Kiyosawa
  • Patent number: 9494223
    Abstract: A harmonic drive apparatus (also known as a strain wave gear) is constructed with a circular, flexible spline disc having a slightly conical configuration. The flexible saline disc has opposite convex and concave surfaces with a plurality of radial, flexible gear teeth arranged circumferentially on the convex surface. The flexible spline disc enables the harmonic drive apparatus to provide a thinner or more compact packing when needed for unique space requirements of a speed reduction transmission.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: November 15, 2016
    Assignee: The Boeing Company
    Inventor: Max Neal Jensen
  • Patent number: 9476494
    Abstract: A cup-shaped flexible externally toothed gear of a wave gear device, wherein a diaphragm plate slopes from a diaphragm internal peripheral edge portion contiguous to a boss part toward a diaphragm external peripheral edge portion contiguous to a cylindrical body portion in a direction in which the diaphragm external peripheral edge portion is at greater distance from an open end of the cylindrical body portion with respect to an orthogonal plane orthogonal to a central axis line of the device. The length dimension of the diaphragm plate and the length dimension of the cylindrical body portion in the axial direction can be increased. Therefore, the fatigue strength of the diaphragm plate and the load capacity of the wave gear device in which the flexible externally toothed gear has been incorporated can be increased.
    Type: Grant
    Filed: August 17, 2011
    Date of Patent: October 25, 2016
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventors: Stephanie Moune, Noboru Takizawa
  • Patent number: 9470301
    Abstract: A harmonic drive gear reduction mechanism includes a rigid inner spline with 2(n+1) teeth and a tooth module of m, a flexible outer spline inserted in the rigid inner spline has 2n teeth and a tooth module of m, a flexible bearing inserted in the flexible outer spline, and a wave generator inserted in the flexible bearing. A thickness between an inner diameter of the flexible bearing and a pitch diameter of the flexible outer spline is t, a cross sectional profile of the wave generator consists four curves, the first and third curves have a radius of curvature R, R=m (n+1)?t, a central angle of the first and third curves is k, and 10<k?60, the second and fourth curves and conjunction points between the second, fourth curves and the first, third curves can be first-order differentiated.
    Type: Grant
    Filed: October 21, 2013
    Date of Patent: October 18, 2016
    Assignee: Hiwin Technologies Corp.
    Inventor: Chang-Hsin Kuo
  • Patent number: 9394985
    Abstract: A strain wave gearing (1) has a flexible externally toothed gear (3) with a boss (7). A boss-side fastening surface (16) formed on the boss is coaxially superposed with a member-side fastening surface (15) of an output member (11), and the boss (7) and the output member are fastened by fastening bolts (13). The bolt tension of the fastening bolts (13) causes the engaging protuberances (20) of the boss-side fastening surface (16) to dig into the member-side fastening surface (15) by a predetermined dig-in depth. A large frictional force is produced in the fastening portions between the flexible externally toothed gear (3) and the output member (11). It is thereby possible to transmit the necessary torque by the bolt tension alone without using pins or a friction sheet together with the fastening bolts.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: July 19, 2016
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventors: Masaru Kobayashi, Tatsuro Hoshina
  • Patent number: 9382993
    Abstract: A hollow-type strain wave gearing unit (1) has a sealing member (14) for sealing a gap (15) opening to the inner peripheral surface of a unit hollow portion (5) passing through in an axis (1a) direction. The gap (15) includes a gap section (15b) between an outer peripheral side end race (48b) on the wave generator side and a boss side end face (108), both faces opposing each other in the axis (1a) direction, and the sealing member (14) is assembled therein. The gap section (15b) is formed in a state partially entering the inside of the inner ring (11b) of the second bearing (11) supporting the wave generator (4). It is possible to realize a hollow-type strain wave gearing unit with a sealing mechanism that is suitable for increasing the inner diameter of the unit hollow portion and for reducing the unit axial length.
    Type: Grant
    Filed: June 20, 2013
    Date of Patent: July 5, 2016
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventors: Yuya Murayama, Yoshihide Kiyosawa
  • Patent number: 9371899
    Abstract: A selectively disconnectable and reconnectable harmonic drive assembly of a rotary actuator is provided. The drive assembly includes a harmonic wave generator configured to rotate and disconnect and reconnect a harmonic drive of the actuator by moving radially inward to allow the disconnect of a flex spline from a ring gear and radially outward to allow the reconnect of the flex spline to the ring gear. With respect to the disconnect, roller bearings and a disconnect spring are configured to push the wave generator axially when a solenoid is activated, allowing the roller bearings to move radially inward. This movement releases an outward force on the flex spline, disconnecting the flex spline from the ring gear. The solenoid is deactivated so that a ball-lock sleeve is forced axially by a ball-lock-sleeve-return spring, and ball bearings are forced radially into a groove in a locked “disconnect” position.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: June 21, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Derick Balsiger
  • Patent number: 9353804
    Abstract: A harmonic drive assembly with selective disconnect includes a motor with a motor drive shaft, a harmonic drive operatively coupled to the motor drive shaft, and a wave generator operatively coupled to the motor drive shaft and a flex gear of the harmonic drive. Also included is a ring gear of the harmonic drive operatively coupled to the flex gear with a plurality of ring gear teeth configured to mesh with a plurality of flex gear teeth. Further included is an output shaft operatively coupled to the harmonic drive. Yet further included is a retracting mechanism configured to selectively retract the motor drive shaft and the wave generator to decouple the motor drive shaft and the wave generator from the harmonic drive, wherein a clearance between the ring gear teeth and the flex gear teeth is established upon retraction of the motor drive shaft and the wave generator.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: May 31, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Derick S. Balsiger, Keith A. Bloxham
  • Patent number: 9327618
    Abstract: A disc recliner for a seat assembly includes a fixed plate secured to a seat cushion and a rotatable plate secured to a seat back. Each of the fixed and rotatable plates has a plurality of teeth, the number of teeth not being equal. A flex spline has a plurality of teeth, the number of teeth being equal to the number of teeth on the fixed plate. A wave generator causes a portion of the teeth on the flex spline to meshingly engage with the teeth on the fixed and rotatable plates. Rotation of the wave generator causes the teeth on the flex spline which meshingly engage with the teeth on the fixed and rotatable plates to change, thereby causing the rotatable plate to rotate relative to the fixed plate, which in turn causes the seat back to pivot relative to the seat cushion.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: May 3, 2016
    Assignee: Magna Seating Inc
    Inventors: Randolph P Villarroel, Xiao J Wei, Omar D Tame
  • Patent number: 9321172
    Abstract: A modular rotational electric actuator includes an output housing and internal drive components that include integrated control electronics, a torque sensor, and a portion of a joint assembly. The joint assembly includes a joint connector coupled to the internal drive components, including integrated control electronics, e.g., by a resilient member. The resilient member elastically couples the joint connector to a portion of the output housing, the joint connector including a portion that extends outward therefrom.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: April 26, 2016
    Assignee: HDT Expeditionary Systems, Inc.
    Inventors: Ezra Johnson, Thomas W. Van Doren, W. Travis Lontz, Billy Mitchell Coleman
  • Patent number: 9163710
    Abstract: In a hollow wave gear device, a rigid internally toothed gear and a wave generator are disposed adjacent along a center axis line so as to enclose a cylindrical barrel part of a flexible externally toothed gear from the outside. A pushed cylindrical portion adjacent to an external-tooth-formed cylindrical portion of the cylindrical barrel part is pushed from the outside and made to flex into an ellipsoidal shape by the wave generator disposed on the outside thereof, whereby external teeth partially mesh with internal teeth of the rigid internally toothed gear. The inside diameter dimension of a hollow part can be the inside diameter of the cylindrical barrel part of the flexible externally toothed gear, and a hollow wave gear device can be achieved which is formed with a hollow part having a large inside diameter.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: October 20, 2015
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventor: Satoru Kanai
  • Patent number: 9157517
    Abstract: A harmonic drive includes a first flexible gear and a second flexible gear disposed around the first flexible gear and coaxial with the first flexible gear. A first ring gear meshes with the first flexible gear, and a second ring gear meshes with the second flexible gear.
    Type: Grant
    Filed: September 16, 2013
    Date of Patent: October 13, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Stepan Lunin, Derick Balsiger
  • Patent number: 9145919
    Abstract: A speed-reduction transmission bearing includes a first outer race and a second outer race, each having a different number of inner teeth and outer teeth and being attached to each other, rolling elements set between the first and second outer races to prevent separation between the first and second outer races in axial or radial direction, an inner race rotatably mounted within the first and second outer races, and a wave generator rotatable to push the inner race, forcing the outer teeth of the inner race to partially mesh with the inner teeth of the first and second outer race. Thus, by means of rotation of a tooth number difference, the invention achieves high reduction ratio transmission.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: September 29, 2015
    Inventor: Mao-Tu Lee
  • Patent number: 9109662
    Abstract: A wave generator for a wave gear device is provided with a pair of first rollers arranged in a position that is point-symmetric in relation to the center of a flexible externally toothed gear, a pair of second rollers, and a pair of third rollers. The first rollers are located on a long axis of the flexible externally toothed gear that is being flex into an ellipsoidal shape, and the second and third rollers are located in positions that are linearly symmetric in relation to the long axis between the long axis and a short axis. Support bearings of the first rollers are larger than those of the second and third rollers. The rolling fatigue life of a roller-type of the wave generator can be to be enhanced.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: August 18, 2015
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventor: Masaru Kobayashi
  • Patent number: 9097269
    Abstract: Bracket assemblies for use with actuators are described. An example apparatus includes a bracket defining first apertures and second apertures. The first apertures are to receive fasteners to couple a first end of the bracket to an actuator. One or more of the second apertures is to receive fasteners to couple a controller to the bracket. The actuator is to be on a first side of the bracket and the controller to be on a second side of the bracket. The example apparatus also includes an adjuster to be coupled to the bracket. The adjuster is to vary a distance between a second end of the bracket and the actuator and to support the second end relative to the actuator.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: August 4, 2015
    Assignee: FISHER CONTROLS INTERNATIONAL, LLC
    Inventor: Mark Allen Rachuy
  • Patent number: 9068641
    Abstract: A gearbox comprises a gearbox housing containing a gear train whose shafts are supported by the housing. The housing is fastened to a mounting plate at exactly three mounting points. A number of features cooperate with this three mounting point structure to reduce distortion of the housing that may cause misalignment of individual meshing gears in the gear train, leading to premature failure of those gears transmitting high torque.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: June 30, 2015
    Assignee: Crown Iron Works Company
    Inventor: George E. Anderson
  • Patent number: 9057429
    Abstract: A concentric double axis actuator has a two-stage cross roller bearing, and a preceding-stage actuator and a subsequent-stage actuator which are linked in tandem. The front end of a subsequent stage rotary output shaft of the subsequent actuator, said subsequent stage rotary output shaft passing through a hollow section of the preceding-stage actuator and projecting forward, is linked and fixed to an inner ring of the two-stage cross roller bearing, and the inner ring functions as a subsequent-stage rotary output member. The output rotary side of the preceding-stage actuator is linked to an middle ring of the two-stage cross roller bearing, which functions as a preceding-stage rotary output member. The rotary output element of each stage is supported by the two-stage cross roller bearing, and surface oscillations of the rotary output member of each stage can be minimized, and the moment stiffness of the members can be increased.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: June 16, 2015
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventor: Akihiro Yokoyama
  • Patent number: 9057421
    Abstract: In a wave gear device, an involute tooth profile with the low pressure angle ? (<20°) is employed as a basic tooth profile of external teeth of a flexible external gear. In the principal section of the external teeth, the tooth depth thereof satisfies 2?0mn=2(1+c) mn (deflection coefficient ?0=1+c, 0<c<0.5), which is larger than the standard one. The shifting of the teeth which takes into account coning is performed along the tooth trace direction of the external teeth, so that straight portions of a rack tooth profile on the respective sections perpendicular to the axis in the tooth trace direction of the external teeth are conformed as viewed along the tooth trace direction. The rack tooth profile of the involute tooth profile is a straight line.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: June 16, 2015
    Assignee: HARMONIC DRIVE SYSTEMS INC.
    Inventors: Shoichi Ishikawa, Noboru Takizawa, Takahiro Arima, Yusuke Shibamoto
  • Patent number: 9051922
    Abstract: A drive system having an integrated transmission and motor/generator unit for a wind turbine includes a transmission output shaft designed as a hollow shaft, which receives a sun shaft of an output-side planetary gear stage and is connected thereto. The transmission output shaft comprises a transmission-side end section of an insert shaft which is concentrically arranged within a rotor hollow shaft. The transmission output shaft additionally has a bearing for receiving radial and axial forces. The motor/generator unit has two dedicated bearings. One bearing thereof is a transmission-side bearing. In addition, a rear-side generator bearing is provided.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: June 9, 2015
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Alfons Böing, Ralf Martin Dinter, Jürgen Draber, Arno Klein-Hitpass, Frank Kretschmann, Jan-Dirk Reimers, Friedrich Schöberl, Roland Zeichfüssl
  • Publication number: 20150128761
    Abstract: A transmission device includes an input shaft, a first transmission mechanism, a speed changing mechanism, and an output shaft. The first transmission mechanism includes a transmission shaft, an inner magnetic member received in the transmission shaft, a mounting housing coupled to the input shaft, and an outer magnetic member. The input shaft is configured to rotate the mounting housing. The outer magnetic member is received in the mounting housing and positioned adjacent to the inner magnetic member. A magnetic pole of the inner magnetic member is opposite to a magnetic pole of the outer magnetic member. The speed changing mechanism is coupled to the transmission shaft. The output shaft is coupled to the speed changing mechanism.
    Type: Application
    Filed: October 28, 2014
    Publication date: May 14, 2015
    Inventors: MI-CHIEN CHEN, YA-YI CHANG
  • Patent number: 9021919
    Abstract: A strain wave gear apparatus includes a rigid internal gear, a flexible external gear, and a wave generator. The wave generator includes an input shaft fixing member including eccentric cams, bearings respectively fixed to outer sides of the eccentric cams, and housings respectively fitted to outer peripheral surfaces of the bearings. The eccentric cams are arranged side by side in a direction of an inclined axis inclined with respect to an input rotation axis at an inclination angle (?) in a manner that respective center axes of the eccentric cams are parallel to the inclined axis and decentered in directions opposite to each other from the inclined axis. The housings are each formed into a tapered shape so that an outer peripheral surface of each of the housings is held in surface contact with an inner peripheral surface of the flexible external gear.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: May 5, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshifumi Takahashi, Masaichi Sato, Isamu Okuma
  • Publication number: 20150114174
    Abstract: An improved strain wave drive system employs an outer circular spline part and an outer dynamic spline part spaced apart by a gap from each other in a widthwise (axial) direction and each having a array of internally facing gear teeth, a two-part inner flexible spline (flexspline) having two different sets of externally facing toothed projections offset by a gap from each other across a width extending in a widthwise (axial) direction, a wave generator coupled to the central rotor or shaft for generating a wave impulse that displaces the inner flexspline toothed projections into mesh with those of the outer circular spline part and an array of roller bearings supporting an inner surface across the width of the flexspline in rolling line bearing contact.
    Type: Application
    Filed: October 27, 2014
    Publication date: April 30, 2015
    Inventor: Roopnarine
  • Publication number: 20150107406
    Abstract: A torque transmission and sealing assembly includes a ring gear having a first axial end, a second axial end opposite the first axial end, an inner surface including a plurality of teeth and an axial-facing surface at the first axial end, a barrel portion joined to the second axial end of the ring gear, and a plurality of annular, axial extending fingers integrally formed with the ring gear and extending from the axial-facing surface.
    Type: Application
    Filed: October 6, 2014
    Publication date: April 23, 2015
    Inventors: Gregory Tarbell, Anthony Giammarise, Jeremy Plummer, Carlos Vallejo, Steven Owens, Dennis Richter, Gregory Hecker
  • Patent number: 9003924
    Abstract: A cup-shaped flexible externally toothed gear of a wave gear device comprises a cylindrical body part, and an external-teeth area thereof includes a pushed portion pushed radially outward by a wave generator and a groove formed in a position adjacent to the pushed portion toward a diaphragm. The reaction force of the wave generator can be reduced because the groove is formed to partially reduce thickness in a portion that does not affect the root strength of the external teeth. The increase in root stress can be suppressed when the roots of the external teeth are thickened, and root strength can be effectively increased. The load torque of the wave gear device can thereby be increased.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: April 14, 2015
    Assignee: Harmonic Drive Systems Inc.
    Inventor: Satoru Kanai
  • Patent number: 8997607
    Abstract: In a wave gear device, an annular rigid externally toothed gear is disposed on the inner side of a cup-shaped flexible internally toothed gear. An internal-tooth-formation portion of the flexible internally toothed gear and a pushed portion pushed by a wave generator and flexed ellipsoidally are formed in different positions along the center axis line. The wave generator is disposed on the inner side of the flexible internally toothed gear, the pushed cylindrical portion is pushed from the inner side to the outside along the radial direction thereof by the wave generator, whereby the pushed cylindrical portion is flexed ellipsodially. As the outside diameter dimension of the wave gear device is determined by that of the flexible internally toothed gear, a wave gear device having a small outside diameter dimension can be obtained.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: April 7, 2015
    Assignee: Harmonic Drive Systems Inc.
    Inventor: Satoru Kanai
  • Patent number: 8991282
    Abstract: A wave gear unit has an input shaft positioned along a center axis by first and second input bearings. A first unit end plate at the first-input-bearing side is a composite member in which a bearing housing member of an iron-based material is integrated with an end plate main body member of a lightweight material. A second unit end plate at the second-input-bearing side is integrated with a rigid internally toothed gear, and is a composite member in which a second member of a lightweight material is integrated with a first member of a lightweight material. The first member has an end plate main body portion of the second unit end plate and a gear main body portion of the rigid internally toothed gear, while the second member has a bearing housing portion of the second unit end plate and a teeth formation portion of the rigid internally toothed gear.
    Type: Grant
    Filed: December 12, 2012
    Date of Patent: March 31, 2015
    Assignee: Harmonic Drive Systems Inc.
    Inventors: Yoshikazu Yajima, Junichi Kurogi
  • Publication number: 20150047463
    Abstract: Systems and methods in accordance with embodiments of the invention implement bulk metallic glass-based macroscale gears. In one embodiment, a method of fabricating a bulk metallic glass-based macroscale gear, where at least either the thickness of the gear is greater than 3 mm or the diameter of the gear is greater than 9 mm, includes: obtaining design parameters of the gear to be formed; selecting a bulk metallic glass from which the gear will be formed based on the obtained design parameters, where the selected bulk metallic glass is characterized by a resistance to standard modes of wear and a resistance to brittle fracture such that a gear can be formed from the selected bulk metallic glass that accords with the obtained design parameters; and fabricating the gear from the selected bulk metallic glass that accords with the obtained design parameters.
    Type: Application
    Filed: June 26, 2013
    Publication date: February 19, 2015
    Inventors: Douglas C. HOFMANN, Andrew KENNETT, Kobie T. BOYKINS
  • Patent number: 8910545
    Abstract: In an elliptical rim neutral line of each axially perpendicular cross section in a tooth trace direction of a flexible externally toothed gear of a wave gear device, external teeth are applied with addendum modification along the external teeth tooth trace direction so that the bending stress generated at the root rim surface of the external teeth that is caused by flexing of the flexible externally toothed gear is averaged out, the maximum value thereof can be reduced, and the transferred torque of the wave gear device can be increased.
    Type: Grant
    Filed: May 29, 2012
    Date of Patent: December 16, 2014
    Assignee: Harmonic Drive Systems, Inc.
    Inventor: Shoichi Ishikawa
  • Patent number: 8899206
    Abstract: A balancing device for an engine includes a crankshaft for converting reciprocal motion of a piston of the engine to a rotary motion, at least one electromagnetic force generator mounted apart from the crankshaft by a predetermined distance and generating an electromagnetic force, and a control portion controlling the electromagnetic force generator to generate an electromagnetic force offsetting an unbalanced force occurring according to a rotational position of the crankshaft.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: December 2, 2014
    Assignee: Hyundai Motor Company
    Inventor: Younghun Ahn
  • Patent number: 8888374
    Abstract: A bearing with antiskid design used in combination with a circular spline to form a harmonic drive, and the circular spline is provided with an inner toothed portion, the bearing includes: an elliptical gear plug, a flexible ball bearing, and a flexible spline. Between the flexible ball bearing and the flexible spline are disposed a first and second antiskid members, and the arrangement of the first and second antiskid members prevents the axial slippage between the flexible ball bearing and the flexible spline, thus improving stability and transmission accuracy of the harmonic drive.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: November 18, 2014
    Assignee: Hiwin Technologies Corp.
    Inventors: Fang-Ling Nien, Chia-Yin Tsai
  • Patent number: 8881615
    Abstract: Transmission, in particular for converting a rotational movement around the longitudinal axis of the transmission into a linear movement in the direction of the longitudinal axis or vice versa, having a rod having a gearing, a gear tooth carrier, in which gear teeth are accommodated so they are radially movable for an engagement with the gearing, the rod and the gear tooth carrier being mounted rotationally fixed relative to one another.
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: November 11, 2014
    Assignee: Wittenstein AG
    Inventor: Heiko Schreiber
  • Patent number: 8875598
    Abstract: A unit type wave gear device (1) has a unit housing (2), one end of which is defined by a two-stage cross roller bearing (7). The two-stage cross roller bearing (7) has: an inner cross roller bearing formed by an inner ring (13), an intermediate ring (12), and inner rollers (17) inserted into an inner track (16); and has an outer cross roller bearing formed by an outer ring (11), the intermediate ring (12), and outer rollers (15) inserted into an outer track (14). A flexible externally-toothed gear (22) affixed to the intermediate ring (12) is rotatably supported by the unit housing (2) via the outer cross roller bearing. An input shaft (4) affixed to the inner ring (13) and a wave generator (23) affixed to the input shaft (4) are rotatably supported by the intermediate ring (12) via the inner cross roller bearing. A unit type wave gear device can be realized in which the number of components are reduced and a large moment load is applied.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: November 4, 2014
    Assignee: Harmonic Drive Systems, Inc.
    Inventors: Masashi Horiuchi, Akihiro Yokoyama, Naomi Shirasawa
  • Patent number: 8869651
    Abstract: A harmonic reducer with clutch function includes a circular spline, a mounting base, a flexspline and a wave generator. When a power source drives the wave generator to rotate in a first direction, a one-way clutch engages to lock the mounting base so as to deform the flexspline and hence rotate the circular spline in the first direction. When an external force is applied to the output shaft in the first direction, the mounting base is driven by the flexspline so the one-way clutch disposed thereon is disengaged by a force in a second direction. At this moment, the rotation speed of the wave generator is equal to zero relative to the flexspline, so the wave generator can be driven by the circular spline to rotate along with the flexspline, and the central axel of the wave generator can be driven to rotate as well.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: October 28, 2014
    Inventor: Chun-Shen Yeh
  • Patent number: 8867962
    Abstract: The present invention provides a driving component, a photosensitive drum and a process cartridge. The driving component comprises a gear having one fixed end and a regulating component having a rotational driving force receiver outside the other end projecting from the gear. The regulating component is provided within the gear by being moved reciprocally and translationally along the gear's longitudinal direction and a first direction perpendicular to the longitudinal direction relative to the gear. A spring support part and a longitudinal position limit part are provided between the regulating component and the gear. The rotational driving force receiver is provided inside the regulating component by rotating around its own axis. Compared to the existing technology, the process cartridge using this driving component has a smooth engagement with a printer, reliable performance and stable work.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: October 21, 2014
    Assignee: Print-Rite•Unicorn Image Products Co., Ltd. of Zhuhai
    Inventor: Zhiya He
  • Patent number: 8833205
    Abstract: An externally toothed portion of a cup-shaped flexible externally toothed gear of a wave gear device is flexed into an ellipsoidal shape by a six-roller-type wave generator. A region of an inner peripheral surface of the ellipsoidally flexed externally toothed portion that is positioned on a major axis of the ellipsoidal shape is maximally inclined. First rollers of the wave generator are arranged so that the incline is identical to the incline of the region of the inner peripheral surface. A circular outer peripheral surface of the first rollers can be brought into contact with the region of the inner peripheral surface in an external-tooth tooth-trace direction without deflection; therefore, the angular transmission precision of the wave gear device can be improved.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: September 16, 2014
    Assignee: Harmonic Drive Systems Inc.
    Inventor: Masaru Kobayashi
  • Patent number: 8823227
    Abstract: In a drive unit having at least one transmission stage (Ü) and one drive element (4) for driving with high power density, having a drive element (4), and element (8), and an output element (14), wherein a translation and transmission of a drive torque occurs between the drive element (4) and the output element (14) via a plurality of radially movable toothed segments (10), the drive element (4) is to be embodied as an electrical drive for the transmission stage (Ü).
    Type: Grant
    Filed: November 27, 2008
    Date of Patent: September 2, 2014
    Assignee: Wittenstein AG
    Inventor: Thomas Bayer
  • Patent number: 8783134
    Abstract: Gearing (1), in particular single-stage gearing having a transmission ratio of greater than 1 to 10, having an internal gear (2) with an internal toothing (5), a first toothed ring with radially movable first teeth (6) for engaging into the internal toothing (5), a second toothed ring with radially movable second teeth (7) for engaging into the internal toothing (5), an inner shaft (21) on which is fastened a first cam disk (16) for the radial drive of the first teeth (6) and a second cam disk (17) for the radial drive of the second teeth (7), and a load dividing device for dividing a torque transmitted via the toothed rings between the toothed rings.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: July 22, 2014
    Assignee: Wittenstein AG
    Inventors: Frank Michel, Michael Schmidt, Thomas Bayer, Heiko Schreiber, Lars Estermann
  • Patent number: 8776638
    Abstract: Disclosed is a wave gear device (1) for setting the flexible state of the principal section (30) of a flexible external gear in a normal-deflection state (at a deflection coefficient ?=1). The moving locus of a tooth profile in the principal section (30) is determined by a rack approximation, and a similar curve (BC), which is obtained by similarly transforming a curve (AB) cut from that moving locus, is used to define the fundamental addendum shape of the tooth profile in the principal section.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: July 15, 2014
    Assignee: Harmonic Drive Systems Inc.
    Inventor: Shoichi Ishikawa
  • Patent number: 8770064
    Abstract: The flexible bearing of the wave generator for a wave gear device is a deep-groove ball bearing in which an outer race and an inner race form an annular flexible bearing ring capable of bending in a radial direction. A ball diameter Da is set to be 5 to 15% greater than that of each model of the currently available product. Dimensions of orbital plane radii ro, ri of the inner and outer races are set so that the ratio ro/Da of the orbital plane radius ro of the inner race and the ball diameter Da, as well as the ratio ri/Da of the orbital plane radius ri of the outer race and the ball diameter Da, are both in the range of 0.51 to 0.52. With this configuration, the service life of the flexible bearing can be extended.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: July 8, 2014
    Assignee: Harmonic Drive Systems Inc.
    Inventors: Xin Yue Zhang, Toshimi Yamagishi, Keiji Ueura
  • Patent number: 8757029
    Abstract: Provided is a strain wave gearing having a high stiffness and no limitation imposed on rotation, and a robotic arm including the strain wave gearing. A strain wave gearing includes an electric motor and a strain wave gearing reducer. The strain wave gearing reducer includes: an outer ring member including a first internal gear; a pair of second internal gears each having internal teeth formed along an inner periphery thereof, and the pair of second internal gears differing from the first internal gear in number of teeth; a flexible gear; and a cam member, which distorts the flexible gear in a radial direction to cause the flexible gear to engage with the first internal gear and the pair of second internal gears. The pair of second internal gears is fixed to a pair of fixing plates coupled to each other by a shaft penetrating the cam member.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: June 24, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Mahito Negishi
  • Patent number: 8733207
    Abstract: Provided is a method of driving a joint device suitably used for a robot joint with improved back drivability. A first motor and a second motor are fixedly connected to a first link. An output shaft of the first motor is coupled to an internal gear of a differential speed reducer. An output shaft of the second motor is coupled to an external gear of the differential speed reducer. A second link is coupled to the internal gear of the differential speed reducer. When the first link and the second link are relatively stopped to keep a joint angle fixed, both of the first motor and the second motor are rotated with a rotational speed larger than zero, and the rotational speed of the first motor and that of the second motor are differentiated to stop the second link.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: May 27, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Masahiro Doi
  • Publication number: 20140121048
    Abstract: Certain embodiments include a system having a first grip configured to couple to a first tubular, a second grip configured to couple to a second tubular, where the first and second tubulars are connected by a threaded connection, and a gear assembly coupling the first and second grips, wherein the gear assembly has a speed ratio greater than 1.
    Type: Application
    Filed: October 30, 2012
    Publication date: May 1, 2014
    Applicant: TESCO CORPORATION
    Inventors: Ryan Thomas Bowley, Edgar Fernando Yajure
  • Patent number: 8689657
    Abstract: A gearbox transmits rotational movement from a driving member to a driven member. The gearbox includes a pinion gear disposed inside a housing. The gear defines an axial bore and rotates in response to rotation of the driving member. An output member extends through the axial bore and engages therewith such that the output member rotates in response to rotation of the gear. The output member extends to a position outside the housing to rotate the driven member. A clamping nut is threadably coupled to the output member and abuts the gear thereby retaining the output member and the gear together. A bearing is disposed radially between the gear and the housing. The bearing rotatably supports the gear and the output member.
    Type: Grant
    Filed: July 9, 2009
    Date of Patent: April 8, 2014
    Assignee: McLaren Performance Technologies, Inc.
    Inventors: Jonathan M Adler, Dennis Cook
  • Publication number: 20140083245
    Abstract: A harmonic reducer with clutch function includes a circular spline, a mounting base, a flexspline and a wave generator. When a power source drives the wave generator to rotate in a first direction, a one-way clutch engages to lock the mounting base so as to deform the flexspline and hence rotate the circular spline in the first direction. When an external force is applied to the output shaft in the first direction, the mounting base is driven by the flexspline so the one-way clutch disposed thereon is disengaged by a force in a second direction. At this moment, the rotation speed of the wave generator is equal to zero relative to the flexspline, so the wave generator can be driven by the circular spline to rotate along with the flexspline, and the central axel of the wave generator can be driven to rotate as well.
    Type: Application
    Filed: December 21, 2012
    Publication date: March 27, 2014
    Inventor: Chun-Shen YEH
  • Patent number: 8677963
    Abstract: An electrical camshaft phaser arrangement for controllably varying the phase relationship between a crankshaft and a camshaft in an internal combustion engine includes an adjusting gear drive unit formed as a three shafts transmission having a drive shaft connected with the crankshaft, an output shaft connected with the camshaft, and an adjusting shaft connected with the control shaft of an electrical machine. The electrical machine allows phasing the camshaft with regards to the crankshaft by increasing or decreasing control shaft speed, the control shaft being spinning during phase holding modes. The adjusting gear drive unit is configured such that an energy recovering mode is provided wherein a braking torque is applied to the control shaft in order to generate electrical energy.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: March 25, 2014
    Assignee: Delphi Technologies, Inc.
    Inventors: Sebastien Stoltz-Douchet, Sebastien Mafrica