Patents Assigned to NSK Ltd.
  • Patent number: 11564772
    Abstract: When the compressed air is not applied, an inclined surface, which is positioned at an upstream side with respect to the supply direction of the compressed air, of the lip part is in contact with the inclined surface of the inner ring. When the compressed air is applied, a contact area between the inclined surface, which is positioned at the upstream side with respect to the supply direction of the compressed air, of the lip part and the inclined surface of the inner ring becomes smaller, as compared to when the compressed air is not applied.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: January 31, 2023
    Assignee: NSK LTD.
    Inventors: Toru Nakahara, Atsuhiro Yamamoto, Shoshi Miyazaki
  • Publication number: 20230024110
    Abstract: A torque transmission joint includes a first elastic body having a plurality of first elastic pieces pinched in a circumferential direction between respective first convex portions and a coupling, and a second elastic body having a plurality of second elastic pieces pinched in the circumferential direction between respective second convex portions and the coupling.
    Type: Application
    Filed: December 2, 2020
    Publication date: January 26, 2023
    Applicant: NSK LTD.
    Inventors: Toru ISHII, Toru SEGAWA, Ryo OSAWA, Yuki UCHIYAMA
  • Publication number: 20230016560
    Abstract: A control device includes a current command value calculation unit configured to calculate a first current command value causing an actuator to generate steering assist torque, a correction value calculation unit configured to, when an absolute value of steering angle is greater than or equal to a threshold value, calculate a correction value for suppressing increase in an absolute value of the steering angle by correcting the steering assist torque, a correction unit configured to calculate a second current command value obtained by correcting the first current command value by the correction value, and a driving unit configured to drive the actuator, based on the second current command value. The correction value calculation unit calculates the correction value, based on first torque, the first torque changing nonlinearly with respect to steering angular velocity.
    Type: Application
    Filed: October 4, 2021
    Publication date: January 19, 2023
    Applicant: NSK LTD.
    Inventors: Tetsuya KITAZUME, Shoya MARUYAMA
  • Publication number: 20230015290
    Abstract: A ball screw device has a screw shaft; a nut; a circulation part; and balls; a housing concave groove provided on the outer circumferential surface of the nut and linearly extending in the axial direction and opening to end surfaces on both outer sides in the axial direction of the nut, a circulation part arranged inside the housing concave groove, and the circulation part being prevented from displacing toward the outer side in the radial direction and displacing in the circumferential direction with respect to the nut by engaging an engaging convex portion of a fixing portion provided in the end portion on each of both outer sides in the axial direction of the circulation part with an engaging recess portion provided in the end portion of each of both outer sides in the axial direction of the housing concave groove.
    Type: Application
    Filed: March 12, 2021
    Publication date: January 19, 2023
    Applicant: NSK Ltd.
    Inventors: Kazuya YAMADA, Yuji SHIMOMURA, Yasuaki ABE, Kanta SATO
  • Patent number: 11540902
    Abstract: When the compressed air is not applied, an inclined surface, which is positioned at an upstream side with respect to the supply direction of the compressed air, of the lip part is in contact with the inclined surface of the inner ring. When the compressed air is applied, a contact area between the inclined surface, which is positioned at the upstream side with respect to the supply direction of the compressed air, of the lip part and the inclined surface of the inner ring becomes smaller, as compared to when the compressed air is not applied.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: January 3, 2023
    Assignee: NSK LTD.
    Inventors: Toru Nakahara, Atsuhiro Yamamoto, Shoshi Miyazaki
  • Patent number: 11541450
    Abstract: To provide a method of manufacturing a shaft for a steering device, the shaft including a spline shaft part to be coupled with an input shaft, a stopper part to be coupled with an output shaft, and an intermediate shaft part that couples the spline shaft part with the stopper part. The method includes: a step of forming a hole part recessed in an axial direction from one end of a pillar-shaped material by forging; and a step of pressing the material in which the hole part has been formed into a die to perform drawing in a radial direction on a portion of the material at which the spline shaft part and the intermediate shaft part are formed, and prolonging a length along the axial direction of the hole part at the same time by forging.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: January 3, 2023
    Assignee: NSK LTD.
    Inventors: Tatsuya Suehiro, Kaname Yasuda, Kazuya Yamada
  • Publication number: 20220416580
    Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and a driving device 61 which is installed in the wheel 3 and which drives the wheel 3 with power received by the power reception device 5, wherein the power reception device 5 is provided with a converter 56a and an inverter 56b, at least a portion of the converter 56a and at least a portion of the inverter 56b are housed in the wheel 3, the converter 56a is positioned vertically above the power reception coil 51, and the inverter 56b is positioned vertically above the converter 56a.
    Type: Application
    Filed: September 10, 2020
    Publication date: December 29, 2022
    Applicants: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.
    Inventors: Hiroshi FUJIMOTO, Osamu SHIMIZU, Keizo AKUTAGAWA, Yasumichi WAKAO, Isao KUWAYAMA, Daisuke GUNJI
  • Patent number: 11534884
    Abstract: A grinding apparatus includes: a grinding stone in which an outer circumferential surface thereof is pressed against the workpiece while being rotated and driven; and a fluid injection apparatus that has a fluid injection nozzle including an injection port from which a fluid is injected to the outer circumferential surface of the grinding stone, and a grinding oil supply apparatus that supplies a grinding oil to a processing point and that includes a grinding oil supply nozzle separate from the fluid injection nozzle, the processing point being an abutting section of the grinding stone and the workpiece, wherein the injection port is arranged so as to face the outer circumferential surface of the grinding stone in a state capable of injecting the fluid to a position different from the processing point in a radial direction of the grinding stone among the outer circumferential surface of the grinding stone.
    Type: Grant
    Filed: March 3, 2022
    Date of Patent: December 27, 2022
    Assignee: NSK LTD.
    Inventors: Eiji Utada, Kazutaka Egami
  • Publication number: 20220403921
    Abstract: Provided is a power transmission device including a housing and a ball screw device including a nut housed in the housing. The device includes a screw shaft passing through the nut, and balls disposed between the nut and the screw shaft. The device also includes a first bearing and a second bearing that are disposed to be adjacent to each other in a center axis direction parallel with a center axis of the nut between the housing and the nut; and a preload applying member constituted of an elastic body and configured to apply preloads to the first bearing and the second bearing. The first bearing and the second bearing respectively include outer rings that are fitted to the housing and separated from each other in the center axis direction, and the first bearing and the second bearing are disposed to be a face-to-face combination.
    Type: Application
    Filed: November 6, 2020
    Publication date: December 22, 2022
    Applicant: NSK Ltd.
    Inventors: Hironari SAKODA, Yuta CHIHARA, Takuya MIWA
  • Patent number: 11531344
    Abstract: Provided are an autonomous running device, a running control method for the autonomous running device, and a running control program of the autonomous running device that allow the autonomous running device to reach a destination while continuing estimation of its self-position. An autonomous running device includes a first position estimation unit that estimates the position of the autonomous running device on the basis of information about surroundings of the autonomous running device, produces information about the estimated position of the autonomous running device as first positional information, and updates the first positional information, a second position estimation unit that estimates the position of the autonomous running device on the basis of rotation amounts of wheels, produces information about the estimated position of the autonomous running device as second positional information, and updates the second positional information, and a control unit.
    Type: Grant
    Filed: April 26, 2019
    Date of Patent: December 20, 2022
    Assignee: NSK LTD.
    Inventors: Mayuko Mori, Kei Kondo, Masaaki Tanoue, Satoshi Ozaki
  • Publication number: 20220388209
    Abstract: The resin injection gate is disposed at the pillar part. When the bearing cage is divided into first and second regions by an imaginary line connecting the resin injection gate and a weld to be formed at a position radially facing the resin injection gate, a resin reservoir that can store therein the melted resin is formed at the pillar part in only one of the regions. A circumferential distance between the resin reservoir and the weld is smaller than a circumferential distance between the resin reservoir and the resin injection gate. A cross-sectional area of a communicating part of the resin reservoir, which is configured to communicate with the pillar part, is equal to or less than a quarter of a cross-sectional area of the resin injection gate.
    Type: Application
    Filed: August 18, 2022
    Publication date: December 8, 2022
    Applicant: NSK LTD.
    Inventors: Yoshikazu Kuramoto, Nariaki Aihara, Takayuki Hiramoto
  • Patent number: 11518429
    Abstract: The torque transmission joint includes an intermediate transmission member, and a first transmission member and a second transmission member that are arranged with one each on both side sections in the axial direction of the intermediate transmission member, with the outer side sections in the radial direction of each engaging with the inside section in the radial direction of the intermediate transmission member. The first transmission member and the second transmission member have a first preliminary engagement section and a second preliminary engagement section at the end sections in the axial direction on sides close to each other. The first preliminary engagement section and the second preliminary engagement section engage with each other with a circumferential gap interposed therebetween that does not disappear when torque transmission is performed between the first transmission member and the second transmission member via the intermediate transmission member.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: December 6, 2022
    Assignee: NSK, Ltd.
    Inventors: Yoshifumi Kurokawa, Toru Segawa, Toru Ishii
  • Publication number: 20220379948
    Abstract: A steering device including a steering column supporting a steering shaft to be coupled to a steering wheel. The steering column is sandwiched between a bracket including a first support plate and a second support plate with a tightening shaft penetrating the first support plate and the second support plate and including a male thread at an end of the tightening shaft on a side close to the second support plate having a nut attached thereon. An operation lever is disposed between the nut and the second support plate and penetrated by the tightening shaft. A case including a bottom surface facing an end surface of the tightening shaft is attached to the operation lever, and a coil spring coming into contact with the bottom surface and the tightening shaft.
    Type: Application
    Filed: November 5, 2020
    Publication date: December 1, 2022
    Applicant: NSK LTD.
    Inventors: Shin MIHARA, Osamu KURIHARA
  • Patent number: 11511788
    Abstract: The outer column has a press-fitted portion into which the inner column is press-fitted on the inner-diameter side, and an adjacent large diameter portion arranged in a location adjacent to the press-fitted portion in the axial direction and having an inner-diameter dimension larger than an inner-diameter dimension of the press-fitted portion. The inner-circumferential surface of the press-fitted portion and the outer-circumferential surface of the inner column come in contact with each other with an interference directly or via another member at only a plurality of contact locations separated in the circumferential direction. The column-side bracket is welded to an outer-circumferential surface of the adjacent large diameter portion with at least a part of the column-side bracket located on the outer-diameter side of the press-fitted portion.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: November 29, 2022
    Assignee: NSK Ltd.
    Inventors: Suguru Sugishita, Masaru Oosawa
  • Patent number: 11511803
    Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: November 29, 2022
    Assignee: NSK LTD.
    Inventors: Takayuki Kobayashi, Dai Suzuki, Shin Kumagai, Hidetaka Nakamura
  • Publication number: 20220371651
    Abstract: A power transmission device including a housing and a ball screw device including a nut, a screw shaft, and a plurality of balls. The device includes a pulley device including a driving pulley configured to be driven by receiving power transmitted from a power source, a driven pulley fixed to the nut, and a belt wound around outer peripheral surfaces of the driving pulley and the driven pulley. The device also includes a first bearing and a second bearing disposed between the housing and the nut in a center axis direction parallel with a center axis of the nut; and a preload applying member configured to apply preloads to the first bearing and the second bearing. The first bearing and the second bearing are respectively disposed on both sides of the driven pulley to be a face-to-face combination, and each of the first bearing and the second bearing includes an outer ring engaged with the housing.
    Type: Application
    Filed: October 22, 2020
    Publication date: November 24, 2022
    Applicant: NSK Ltd.
    Inventors: Yuta CHIHARA, Hironari SAKODA, Takuya MIWA
  • Patent number: D975732
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: January 17, 2023
    Assignee: NSK LTD.
    Inventor: Norifumi Ikeda
  • Patent number: D975733
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: January 17, 2023
    Assignee: NSK LTD.
    Inventor: Norifumi Ikeda
  • Patent number: D975734
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: January 17, 2023
    Assignee: NSK LTD.
    Inventor: Norifumi Ikeda
  • Patent number: D975735
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: January 17, 2023
    Assignee: NSK LTD.
    Inventor: Norifumi Ikeda