Patents Assigned to Nabtesco Corporation
  • Patent number: 11187300
    Abstract: A speed reducer according to one embodiment of the invention includes a carrier having a recess therein, a crankshaft disposed in the recess, and a stopper that is disposed on a bottom surface of the recess and prevents the crankshaft from moving in a direction along a rotation axis of the crankshaft toward the bottom surface.
    Type: Grant
    Filed: July 1, 2020
    Date of Patent: November 30, 2021
    Assignee: NABTESCO CORPORATION
    Inventor: Kazuya Furuta
  • Patent number: 11177741
    Abstract: An AC-AC converter circuit converts an AC voltage into a further AC voltage. A rectifier circuit rectifies the AC voltage. An inverter circuit generates the further AC voltage. AZ source circuit is provided between the rectifier circuit and the inverter circuit.
    Type: Grant
    Filed: April 13, 2020
    Date of Patent: November 16, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Yasuo Ono, Kazuhito Nakamura, Michael Haider, Dominik Bortis, Johann W. Kolar
  • Patent number: 11168716
    Abstract: One object is to calculate the position of a rod of a linear actuator with a high precision. The linear actuator includes a rod capable of moving in an axial direction relative to a housing. The rod is moved by rotation of an output shaft of a motor. A position sensor for sensing the relative position of the rod relative to a preset reference position is provided in the housing. A rotation sensor for sensing the rotation angle of the output shaft of the motor is provided in the vicinity of the motor. The linear actuator includes a position calculating unit for calculating the position of the rod based on a position sensing value of the position sensor and a rotation angle sensing value of the rotation sensor.
    Type: Grant
    Filed: September 2, 2020
    Date of Patent: November 9, 2021
    Assignee: NABTESCO CORPORATION
    Inventor: Tsutomu Yasui
  • Patent number: 11168709
    Abstract: Provided is a hydraulic drive device configured not to be increased in length in an axial direction. The hydraulic drive device is provided with a body portion for converting energy of a supplied pressure oil into rotational power, the body portion including an output shaft configured to rotate along a rotational axis by the rotational power, a hydraulic block disposed in an extending direction of the output shaft of the body portion and having an oil passage for supplying the pressure oil to the body portion, and a rotation sensor for detecting rotation of the output shaft, at least part of the rotation sensor being disposed in the hydraulic block.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: November 9, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Isamu Okada, Makoto Yoshida
  • Patent number: 11149761
    Abstract: One object is to reduce a weight of a fluid actuator. The fluid actuator includes: a cylinder having an inner space and a first mounting portion, the inner space being partitioned into a first fluid chamber and a second fluid chamber, the first mounting portion being disposed on an end portion of the cylinder on an axial direction A side; and a piston rod configured to reciprocate in accordance with pressures in the fluid chambers. A wall portion defining the first fluid chamber in the cylinder is made of an iron-based alloy. A wall portion defining the second fluid chamber in the cylinder is made of an aluminum alloy. The piston rod is made of an iron-based alloy.
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: October 19, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Koji Ito, Keigo Futamata
  • Patent number: 11143278
    Abstract: An object of the present invention is to provide a steering assistance device that has a single line of final output, thereby to achieve downsizing. The assistance device of the present application includes a speed reducer configured to decelerate a driving force from a motor and output the decelerated driving force, wherein the speed reducer is configured to receive an operation force produced by an operation of a human.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: October 12, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Koji Nakamura, Masahiro Takahashi, Yuto Nakai
  • Patent number: 11141825
    Abstract: A work positioner includes a first work retaining portion for retaining a first workpiece, a first drive portion for outputting a first rotational force about a first rotation axis and imparting a first angular movement about the first rotation axis to the first work retaining portion, a bearing portion supporting the first work retaining portion in cooperation with the first drive portion, a base arranged away from the first rotation axis, a first support column extending along a first support axis extending from the base toward the first rotation axis and supporting the first drive portion, and a second support column extending along a second support axis extending between the base and the first rotation axis so as to be parallel to the first support axis and supporting the bearing portion. The first support column includes a plurality of first support column pieces arranged along the first support axis.
    Type: Grant
    Filed: October 13, 2017
    Date of Patent: October 12, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Mitsuru Shimamoto, Takayuki Okimura, Koji Nakamura, Takahiro Maekawa
  • Patent number: 11098775
    Abstract: A caliper device used together with a brake shoe to retard rotation of a rotor includes a brake arm that is swung relative to a main body by a driving mechanism. The brake arm moves the brake shoe between a brake position and a non-brake position. The caliper device further includes a friction mechanism that increases friction against a swinging movement of the brake arm relative to the main body.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: August 24, 2021
    Assignee: NABTESCO CORPORATION
    Inventor: Masataka Yano
  • Patent number: 11101725
    Abstract: Provided is a rotary electric machine including: a permanent magnet rotatable around a first rotational shaft and disposed at a distance from a main surface of a moving body rotating or moving, at least a part of a side surface of the permanent magnet continuous to an outer peripheral surface thereof being opposed to the main surface of the moving body, wherein the permanent magnet is rotated around the first rotational shaft by a reaction force acting on the permanent magnet, the reaction force being caused by eddy currents produced in the main surface of the moving body in such a direction as to hinder a change of magnetic flux from the permanent magnet, and a surface speed of the side surface of the permanent magnet opposed to the moving body is lower than a surface speed of the main surface of the moving body opposed thereto.
    Type: Grant
    Filed: December 7, 2017
    Date of Patent: August 24, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Michael Flankl, Arda Tueysuez, Johann W. Kolar, Yusuke Tsukada, Kazuhito Nakamura
  • Patent number: 11072364
    Abstract: One object is to provide a steering device that facilitates disengagement of a speed reducer so that, for example, when the speed reducer fails, the speed reducer can be disengaged to enable steering of a vehicle with a manual operational force alone. This application relates to a steering device provided with a steering mechanism and a speed reducer. The steering mechanism steers tires of a vehicle under a steering force from a steering wheel. The speed reducer is connected to a motor for outputting a steering assistance force corresponding to the steering force. The speed reducer enlarges the steering assistance force and transmits the enlarged steering assistance force to the steering mechanism. The speed reducer is connected to the steering mechanism via a speed reducer arm.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: July 27, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Koji Nakamura, Masahiro Takahashi, Yuto Nakai
  • Patent number: 11058558
    Abstract: A multi-articulated link knee joint includes: a knee unit in which an upper link unit rotates relative to a lower link unit by a multi-articulated link mechanism including a plurality of link units including the upper link unit and the lower link unit; a cylinder device for assisting the motion of the knee unit and moving in accordance with the rotation of the upper link unit; a position detector for detecting the distance from the lower link unit to the cylinder device; and an angle detector for obtaining the bending angle of the knee unit from the detected distance from the cylinder device.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: July 13, 2021
    Assignee: NABTESCO CORPORATION
    Inventor: Masahiko Okuda
  • Patent number: 11053451
    Abstract: The invention provides a lubricant composition for an eccentric oscillating planetary gear type speed reducer comprising the following components (a) to (d): (a) a base oil containing a synthetic oil; (b) at least one calcium salt selected from the group consisting of calcium salts of petroleum sulfonic acids, calcium salts of alkyl aromatic sulfonic acids, calcium salts of salicylates, calcium salts of phenates, calcium salts of oxidized waxes, overbased calcium salts of petroleum sulfonic acids, overbased calcium salts of alkyl aromatic sulfonic acids, overbased calcium salts of salicylates, overbased calcium salts of phenates, and overbased calcium salts of oxidized waxes; (c) an antioxidant; and (d) a glycerin fatty acid ester.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: July 6, 2021
    Assignees: KYODO YUSHI CO., LTD., NABTESCO CORPORATION
    Inventors: Ko Tanimura, Ryosuke Ichimura, Ryosuke Saito, Hongyou Wang, Takahide Kumagai
  • Patent number: 11047366
    Abstract: Damage to a driving device or a ring gear or both due to an excessive force at a meshing portion therebetween is effectively prevented. In the embodiment described above, a driving device includes a driving device body that is provided in one structure at a movable section of a wind turbine and has a drive gear meshing with a ring gear provided in the other structure at the movable section, and an abnormality detection unit that monitors a force generated between the ring gear and the drive gear or the state of the driving device body or monitors both of the face and the state. Output from the drive gear of the driving device body to the ring gear is stopped when the abnormality detection unit detected an abnormality.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: June 29, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Osamu Nohara, Shigeru Hosoda, Kei Kato, Haruna Osako
  • Patent number: 11043905
    Abstract: An AC-AC power convertor converts a first AC voltage to a second AC voltage. A PFC rectifier circuit rectifies an AC voltage (vG) so as to generate a rectified voltage. An inverter generates the second AC voltage from the rectified voltage. A controller controls the PFC rectifier circuit and the inverter such that power generated by the first AC voltage and the pulsations of power generated by the rectified voltage are output to an external device.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: June 22, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Yasuo Ono, Michael Haider, Dominik Bortis, Johann W. Kolar
  • Patent number: 11021672
    Abstract: The invention provides a lubricant composition for an eccentrically oscillating speed reducer of planetary gear type, which is capable of extending the life of the speed reducer under high temperatures and keeping low input torque at low temperatures, and includes (a) a base oil containing a synthetic oil, (b) a hydrocarbon wax, and (c) at least one calcium salt selected from the group consisting of a calcium salt of petroleum sulfonic acid, a calcium salt of alkyl aromatic sulfonic acid, a calcium salt of oxidized wax, an overbasic calcium salt of petroleum sulfonic acid, an overbasic calcium salt of alkyl aromatic sulfonic acid, and an overbasic calcium salt of oxidized wax.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: June 1, 2021
    Assignees: KYODO YUSHI CO., LTD., NABTESCO CORPORATION
    Inventors: Junichi Imai, Ryosuke Ichimura, Ryosuke Saito, Ko Tanimura, Hongyou Wang, Takahide Kumagai, Yasuyuki Hattori
  • Patent number: 11015575
    Abstract: One object is to improve the control upon detecting an excessive load in the movable section of a wind turbine, thereby to raise the capacity utilization of the wind turbine. A wind turbine drive system includes: a plurality of driving devices installed in one structure at a movable section of a wind turbine, each of the plurality of driving devices including a drive gear meshing with a ring gear installed in another structure at the movable section of the wind turbine; a state quantity detection unit for monitoring, for each of the plurality of driving devices, a load generated between the drive gear of each of the plurality of driving devices and the ring gear; and a control unit for performing control for reducing the load when the state quantity detection unit detects an abnormal load.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 25, 2021
    Assignee: Nabtesco Corporation
    Inventors: Koji Watanabe, Yoichi Fujii, Jun Asaida
  • Patent number: 11015974
    Abstract: A measurement device includes: a sensor for sensing a condition of an object to be measured; a plurality of output lines L for outputting a sensing result of the sensor; and a control unit for applying voltages to the plurality of output lines based on the sensing result of the sensor. The control unit performs self-failure diagnosis and outputs a result of the self-failure diagnosis with a combination of the voltages applied to the plurality of output lines L.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: May 25, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Koji Hasegawa, Takashi Toyoda
  • Patent number: 11002136
    Abstract: A hydraulic system includes a piston, a swash plate opposed to the piston, and a swash plate supporting member supporting the swash plate so that a tilt of the swash plate is variable. An oil reservoir portion is provided between the swash plate and the swash plate supporting member, the oil reservoir portion communicating with a pressure oil introducing passage. An area of the oil reservoir portion between the swash plate and the swash plate supporting member varies with the tilt of the swash plate.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: May 11, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Toshiya Akami, Sho Yamaguchi
  • Patent number: 10995877
    Abstract: A fluid valve has a valve plug configured as follows. In order to control a flow rate of a fluid between a first pressure chamber and a second pressure chamber, the valve plug is provided so as to be openable and closable in accordance with a difference between forces generated by pressures in the pressure chambers and resilience of an elastic member. The fluid valve includes an opening motion promoting portion. The opening motion promoting portion promotes an increase in degree of opening of the valve plug after the valve plug has been opened.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: May 4, 2021
    Assignee: NABTESCO CORPORATION
    Inventor: Koji Ito
  • Patent number: 10975916
    Abstract: Provided are a connecting structure and a hydraulic drive device capable of simply and reliably connecting two shaft bodies together while appropriately preventing rotation and runout therebetween. The connecting structure includes a first shaft body and a second shaft body connected to each other at respective end portions and provided so as to be rotatable integrally with each other about a rotation axis. An anti-runout support portion of the first shaft body and that of the second shaft body are engaged with each other so as to restrict relative movement between the first and second shaft bodies with respect to a radial direction. An anti-rotation support portion of the first shaft body and that of the second shaft body are engaged with each other so as to restrict relative movement between the first and second shaft bodies with respect to a rotation direction about the rotation axis.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: April 13, 2021
    Assignee: NABTESCO CORPORATION
    Inventors: Isamu Okada, Makoto Yoshida