Patents Assigned to NSK Ltd.
  • Publication number: 20220009548
    Abstract: A detection signal correction method includes: calculating a rotation angle of a rotation shaft of a motor, based on a detection signal of a sensor; calculating a steering velocity of a steering shaft based on the rotation angle; calculating an error of the detection signal; and correcting the error of the detection signals when the steering velocity is equal to or greater than a steering velocity threshold value and the error of the detection signal is equal to or greater than an error threshold value.
    Type: Application
    Filed: December 21, 2020
    Publication date: January 13, 2022
    Applicant: NSK LTD.
    Inventors: Yusuke NISHIOKA, Yoshihiro AOSAKI, Hiroyuki YAMAMURA
  • Publication number: 20220009546
    Abstract: When a vehicle speed Vs of a vehicle is a predetermined alternative vehicle speed, a target steering torque Tref is reduced in accordance with the absolute value of the difference between a physical quantity generated through turning motion of the vehicle and an estimated value of the physical quantity at an alternative vehicle speed.
    Type: Application
    Filed: September 4, 2019
    Publication date: January 13, 2022
    Applicant: NSK LTD.
    Inventor: Kenji MORI
  • Publication number: 20220001914
    Abstract: A steering column device has an inner column; an outer column combined with the inner column and having a slit extending in the axial direction, the inner column and the outer column configuring a telescopic steering column; a release bracket arranged inside the slit of the outer column and supported by and fixed to the inner column; a support bracket joined to the release bracket so as to be able to detach due to an impact load that is applied to the inner column during a secondary collision; and a telescopic friction plate having a function to increase a holding force for holding the steering column with respect to a vehicle-body-side bracket and supported by the support bracket.
    Type: Application
    Filed: November 15, 2019
    Publication date: January 6, 2022
    Applicant: NSK LTD.
    Inventors: Hiroshi KAKITA, Kazuki HARA
  • Patent number: 11214298
    Abstract: The present invention is the electric power steering apparatus that drives a motor based on the current command value and assist-controls a steering system by a driving-control of the motor, comprising: a handle-returning control section to calculate the target steering angle velocity for handle-returning based on the steering torque, the current command value, a vehicle speed, a steering angle, calculate the handle-returning control current based on a deviation between the steering angle velocity and the target steering angle velocity, and interpose a filter, which motion characteristic, in a calculation path of the target steering angle velocity, wherein the motor is driven by the corrected current command value by using the handle-returning control current.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: January 4, 2022
    Assignee: NSK LTD.
    Inventors: Tetsuya Kitazume, Satoshi Shimokawabe
  • Patent number: 11213916
    Abstract: A laser welding apparatus (1) includes a laser welding head (5) configured to irradiate a workpiece (10) with laser light, a welding filler feeding mechanism (6) configured to supply a welding material to a position on which laser welding is performed, and a hollow structural moving mechanism (100) configured to move a welding unit (50) including the laser welding head and the welding filler feeding mechanism. The hollow structural moving mechanism has an insertion portion (3a) through which wire materials (41 and 62) of the laser welding head and the welding filler feeding mechanism are inserted.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: January 4, 2022
    Assignee: NSK LTD.
    Inventors: Shingo Matsuo, Hiroaki Fujishiro, Etsuo Koike, Hironori Okado
  • Patent number: 11215228
    Abstract: A ball bearing includes an inner ring, an outer ring, a plurality of balls rollably provided between the inner ring and the outer ring, and a cage configured to hold the plurality of balls at equal intervals in a circumferential direction. The cage includes a plurality of pockets configured to hold the balls. The plurality of pockets include at least two types of pockets including a first pocket and a second pocket. A gap on each of an outer circumferential surface side and an inner circumferential surface side of the cage between the ball and an inner circumferential surface of the second pocket is larger than a gap on each of the outer circumferential surface side and the inner circumferential surface side of the cage between the ball and an inner circumferential surface of the first pocket.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: January 4, 2022
    Assignee: NSK LTD.
    Inventor: Toru Nanasawa
  • Publication number: 20210394813
    Abstract: An electric steering device includes a top bracket fixed to a vehicle body, a steering shaft to which a steering wheel is connected, a steering jacket which is held by the top bracket and rotatably supports the steering shaft inside, a tilt actuator which adjusts a tilt of the steering jacket, and a link member which is pivotally supported by the top bracket, the steering jacket, and the tilt actuator. The tilt of the steering jacket can be adjusted by transmitting power of the tilt actuator to the steering jacket via the link member. The link member is placed only on one side of the steering jacket in a vehicle left-right direction.
    Type: Application
    Filed: May 26, 2021
    Publication date: December 23, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi KUROKAWA, Victor Corona MARTINEZ
  • Patent number: 11204083
    Abstract: A ball screw device includes a screw shaft having a first thread groove on an outer peripheral surface and a nut having a second thread groove provided on an inner peripheral surface, a notch provided on an end face, and a return hole provided on a bottom surface of the notch orthogonal to an axial direction of the screw shaft and passing through in the axial direction. An end deflector fits into the notch. The nut includes a curved surface portion at a position of a lateral surface of the notch between the second thread groove and the return hole. In a first section, the curved surface portion includes a portion that draws an arc centered at a point positioned outside the second thread groove in a radial direction around a rotation axis of the nut.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: December 21, 2021
    Assignee: NSK LTD.
    Inventor: Yusuke Yorozu
  • Publication number: 20210387669
    Abstract: A turning control device includes: a steering angular displacement calculation unit configured to, when a third steering angle that is either a first steering angle of a turning mechanism or a second steering angle of a steering mechanism, is in an angular range from a maximum angle to a threshold steering angle, calculate a steering angular displacement of the third steering angle with the threshold steering angle used as a reference; a steering angle correction value calculation unit configured to calculate a steering angle correction value according to at least the steering angular displacement; a steering angle correction value limiting unit configured to limit the steering angle correction value according to at least a steering state, the third steering angle, and angular velocity thereof; a corrected target steering angle calculation unit configured to correct the target steering angle of the turning mechanism with a limited steering angle correction value.
    Type: Application
    Filed: October 21, 2020
    Publication date: December 16, 2021
    Applicant: NSK LTD.
    Inventors: Toru SAKAGUCHI, Tetsuya KITAZUME, Shoya MARUYAMA
  • Publication number: 20210387663
    Abstract: A structure is achieved that makes it easy to increase the absorbed amount of an impact load applied to the steering wheel in the event of a secondary collision. A support bracket 18 is arranged inside a slit 25 of an outer column 21 and joined to the inner column 20 so as to be able to detach due to an impact load applied to the inner column 20 at the time of a secondary collision. A base portion 79 of an impact absorbing member 19 is attached to the inner column 20 so as to displace together with the inner column 20 when the inner column 20 displaces toward the front, and a folded portion 78 of the impact absorbing member 19 is made to face a jerking portion 61 of the support bracket 18 in the front-rear direction.
    Type: Application
    Filed: October 24, 2019
    Publication date: December 16, 2021
    Applicant: NSK LTD.
    Inventors: Nobuhiro KOJIYA, Arata URIMOTO, Masaya JOHTA, Seiichi MORIYAMA
  • Publication number: 20210391767
    Abstract: An actuator includes: a first motor including a first stator and a first rotor; a second motor and including a second stator and a second rotor; a shaft member penetrating through the first rotor and the second rotor, and including a first part protruding from the first rotor toward an opposite side to the second rotor and including a spline groove, and a second part protruding from the second rotor toward an opposite side to the first rotor and including a male screw portion; a spline outer cylinder engaging with the spline groove to guide the shaft member and configured to rotate together with the first rotor to enable the shaft member to rotate; and a nut member provided with a female screw portion engaging with the male screw portion of the shaft member, and configured to rotate together with the second rotor to enable the shaft member to move.
    Type: Application
    Filed: September 26, 2019
    Publication date: December 16, 2021
    Applicant: NSK LTD.
    Inventors: Kazunori KOIZUMI, Hayao WATANABE
  • Patent number: 11192578
    Abstract: To provide a motor drive control device, an electric power steering device, and a vehicle which can individually diagnose abnormalities of magnetic detection elements, designed in a multisystem configuration to include at least two systems, for each system. A motor drive control device includes two systems of first and second rotation information detection function units. The first and second rotation information detection function units include first and second rotation position information detection units and first and second rotation information detection units. The first and second rotation information detection units individually diagnose their own abnormalities based on first and second motor rotation position signals detected by the first and second rotation position information detection units.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: December 7, 2021
    Assignee: NSK Ltd.
    Inventors: Masaki Kuwahara, Shigeyuki Uematsu
  • Patent number: 11192579
    Abstract: An actuator control device includes: a turning control value calculation unit configured to calculate a turning control value that controls an actuator configured to turn a steered wheel on a basis of an operation state amount by a driver with respect to a steering mechanism of the vehicle; a target value setting unit configured to set a target value of a state amount indicating a traveling direction of the vehicle on a basis of a surrounding environment of the vehicle; a target value control unit configured to control the actuator by integral control so that actual the state amount approaches the target value; and an integral suppression unit configured to suppress an increase in a first integral value calculated in the integral control according to a second integral value calculated according to the operation state amount.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: December 7, 2021
    Assignee: NSK LTD.
    Inventors: Tadashi Ishida, Masahiro Maeda, Atsushi Kojima
  • Publication number: 20210364043
    Abstract: A rolling bearing unit includes: an inner ring member having a recess on a first side in an axial direction, the recess being recessed toward a second side in the axial direction; an outer ring member disposed on the outer periphery side of the inner ring member; a rolling body disposed between the inner ring member and the outer ring member and rotatably supporting the inner ring member with respect to the outer ring member; a transmitter capable of transmitting at least one of electric power or a signal, at least a part of the transmitter being accommodated inside the recess of the inner ring member; and a covering member that is supported by the first side of the outer ring member in the axial direction, covers the first side of the inner ring member in the axial direction, and fixes the transmitter.
    Type: Application
    Filed: July 3, 2019
    Publication date: November 25, 2021
    Applicant: NSK LTD.
    Inventors: Naohiro HITOMI, Daisuke GUNJI, Hiroyasu KUMAGAI, Ricardo RODRIGUEZ LOPEZ
  • Publication number: 20210354756
    Abstract: A calibration method in which, a rotation angle calculation device calculates a rotation angle based on a detection signal of a sensor, transmits rotation angle data indicating the rotation angle to a calibration device, and transmits time difference data relating to a time difference after having captured the detection signal until transmitting the rotation angle data to the calibration device, and in which the calibration device measures a rotation angle, clocks a measurement time at which the rotation angle is measured and a transmission time of transmitting or receiving the rotation angle data, and acquires calibration data of the rotation angle data by comparing the rotation angle measured at a time obtained by going back in time from the transmission time by the time difference after having captured the detection signal until transmitting the rotation angle data and the rotation angle data with each other.
    Type: Application
    Filed: December 16, 2020
    Publication date: November 18, 2021
    Applicant: NSK LTD.
    Inventors: Yusuke NISHIOKA, Yoshihiro AOSAKI, Hiroyuki YAMAMURA
  • Publication number: 20210354746
    Abstract: An electric drive device and an electric power steering device are provided that reduce the size of a motor in an axial direction parallel to a shaft and in a radial direction of the shaft. The electric drive device includes a bus bar module in which a connector, a first power supply terminal, a second power supply terminal, positive electrode bus bar wiring that electrically connects the connector to the first power supply terminal, and negative electrode bus bar wiring that electrically connects the connector to the second power supply terminal are integrally formed with the connector. The positive electrode bus bar wiring and the negative electrode bus bar wiring extend from the connector, bypass an extended line of the shaft, and are electrically connected to the circuit board in positions at distances from the connector larger than a distance from the connector to the extended line of the shaft.
    Type: Application
    Filed: December 19, 2019
    Publication date: November 18, 2021
    Applicant: NSK LTD.
    Inventor: Masaaki KAWATA
  • Patent number: 11168761
    Abstract: An inner wheel element (15a) is embedded in an outer wheel element (16a), such that a continuous range from an inner diameter side circumferential surface configuring an inner surface of a first annular concave part (22), through an outer circumferential surface of the inner wheel element (15a), to an inner diameter side circumferential surface configuring an inner surface of a second annular concave part (38) in a surface of the inner wheel element (15a) is covered over the entire circumference. Accordingly, a structure is achieved which easily secures a holding power of the synthetic resin outer wheel element with respect to the inner wheel element.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: November 9, 2021
    Assignee: NSK LTD.
    Inventors: Haruhiko Kiyota, Takeshi Yamamoto, Kaname Yasuda, Tomohiro Arai, Junichi Takano, Kazuki Hotta
  • Publication number: 20210339790
    Abstract: A steering jacket includes a first jacket member and a second jacket member in this order from a side proximal to a steering wheel, and the first jacket member and the second jacket member overlap each other such that the steering jacket is extendable and retractable in an axial direction. An actuator is connected to an extension bracket that is attached to an outer surface of the first jacket member and extends toward the front of a vehicle body, so as to extend and retract the first jacket member with respect to the second jacket member.
    Type: Application
    Filed: April 27, 2021
    Publication date: November 4, 2021
    Applicant: NSK LTD.
    Inventors: Yoshifumi KUROKAWA, Jessica Elaine LIPA
  • Patent number: 11162538
    Abstract: A method of manufacturing a rotating bearing unit includes to cause one end surface in the axial direction of the forming punch (46), formed by combining a plurality of punch elements (46, 46) divided in the circumferential direction, which are displaceable in the axial direction and which are not displaceable in the circumferential direction, and having a processing teeth (44, 44) at one end surface in the axial direction, to face the other end surface of the caulking section (20) in the axial direction. In this state, rolls (30a) are rotated about the central axis (?) of the hub main body (8) while pressing the other end surface of the forming punch (46) in the axial direction with a pressing surface (43) of the roll (30a) having a central axis (?) that is inclined with respect to the central axis (?) of the hub main body (8).
    Type: Grant
    Filed: December 2, 2019
    Date of Patent: November 2, 2021
    Assignee: NSK LTD.
    Inventors: Nobuyuki Hagiwara, Kazuto Kobayashi, Isao Shintou, Hiroshi Koyama, Toshio Nakamura
  • Patent number: RE48843
    Abstract: A rolling bearing includes an inner ring having an outer surface, an outer ring having an inner surface, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and a retainer for retaining the rolling elements. The retainer is made of a resin material and is positioned with respect to the inner surface of the outer ring or the outer surface of the inner ring. The retainer includes a pair of annular portions axially arranged in parallel and a columnar portion coupling the annular portions. Then, the rolling bearing satisfies the following expression: AI=LH3/dm?0.025 LH3/dm2?0.025 mm2 in which H is a radial length of a section of the annular portion, L is an axial length of the same, and dm is PCD of the rolling element.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: December 7, 2021
    Assignee: NSK LTD.
    Inventors: Naoki Matsuyama, Sumio Sugita, Yu Koiwa, Takaaki Anzai, Tamotsu Misawa, Masaru Terasaki