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    Method of manufacturing magnetostrictive torque sensor shaft
    1.
    发明授权
    Method of manufacturing magnetostrictive torque sensor shaft 有权

    公开(公告)号：US12152949B2

    公开(公告)日：2024-11-26

    申请号：US17416850

    申请日：2019-12-11

    Applicant: NSK LTD.

    Inventor： Kota Fukuda ,  Junji Ono ,  Teruyuki Nakamura ,  Yuta Sugiyama

    IPC: G01L3/10 ,  B24C1/10 ,  C21D8/06 ,  C21D9/00

    Abstract: A method of manufacturing a magnetostrictive torque sensor shaft (100) to which a sensor portion (2) of a magnetostrictive torque sensor (1) is mounted. The method includes heat treatment step of subjecting an iron-based shaft member to a carburizing, quenching, and tempering process, and a shot peening step of performing shot peening using a boron-free zirconia shot media having a Vickers hardness at least equal to 1100 and at most equal to 1300, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion is to be attached. The surface of the shaft member, after shot peening, has a total error, including hysteresis error and angle error, of not more than 3%.

    Torque measurement device
    2.
    发明授权
    Torque measurement device 有权

    公开(公告)号：US11703403B2

    公开(公告)日：2023-07-18

    申请号：US17788447

    申请日：2021-07-01

    Applicant: NSK LTD.

    Inventor： Takahiro Odera ,  Junji Ono ,  Masahiro Kobayashi ,  Kota Fukuda

    IPC: G01L3/00 ,  G01L3/10

    CPC classification number: G01L3/10

    Abstract: A torque measurement device includes a case that does not rotate even during use; a rotating shaft rotatably supported to the case and having a magnetostrictive effect part whose magnetic permeability changes according to a transmitted torque; and a magnetostrictive sensor having a detection part arranged closely adjacent to the magnetostrictive effect part so that a voltage changes according to change of the magnetic permeability of the magnetostrictive effect part, and being supported to the case; and the torque measurement device has a rotation-preventing construction configured to prevent the magnetostrictive sensor from rotating with respect to the case.

    Torque measuring device
    4.
    发明授权
    Torque measuring device 有权

    公开(公告)号：US11473988B2

    公开(公告)日：2022-10-18

    申请号：US17637263

    申请日：2021-07-01

    Applicant: NSK Ltd.

    Inventor： Takahiro Odera ,  Junji Ono ,  Masahiro Kobayashi ,  Kota Fukuda

    IPC: G01L3/00 ,  G01L3/10 ,  G01L1/12

    Abstract: A torque measuring device includes: a magnetostrictive sensor having a ring-shaped holder arranged around a magnetostrictively affected section of a rotating shaft, a detecting section embedded in the holder and that changing a voltage according to a change in magnetic permeability of the magnetostrictively affected section; and a sensor-side engaging section; and a fixed member having a fixed-side engaging section, the fixed member not rotating even during operation. One of the sensor-side engaging portion and the fixed-side engaging section is a convex section and the other is a concave section. With the sensor-side engaging section and the fixed-side engaging section engaged with a concave-convex engagement, shifting of the position of the magnetostrictive sensor in the direction of rotation and the radial direction with respect to the substrate is prevented.

    Single-cavity toroidal continuously variable transmission
    5.
    发明授权
    Single-cavity toroidal continuously variable transmission 有权

    公开(公告)号：US10247284B2

    公开(公告)日：2019-04-02

    申请号：US15028065

    申请日：2014-04-02

    Applicant: NSK LTD.

    Inventor： Hirotaka Kishida ,  Junji Ono

    IPC: F16H15/38 ,  F16H61/664

    Abstract: A single-cavity toroidal continuously variable transmission capable of suppressing gyro slippage and achieving mitigation of bearing loss and a longer service life. A pitch circle diameter (PCD) of the output-side bearing is smaller than that of the input-side bearing and a ball diameter of the output-side bearing is smaller than that of the input-side bearing. Therefore, centrifugal force acting on the ball of the output-side bearing on a speed increasing side with a low load can be suppressed. Therefore, gyro slippage can be suppressed and mitigation of bearing loss can be achieved. Furthermore, with a groove R ratio of the output-side bearing smaller than that of the input-side bearing, a longer service life can be achieved even when the pitch circle diameter (PCD) and ball diameter of the output-side bearing are smaller than those of the input-side bearing.

    Detection circuit and detection method for magnetostrictive torque sensor
    8.
    发明授权
    Detection circuit and detection method for magnetostrictive torque sensor 有权

    公开(公告)号：US11346731B2

    公开(公告)日：2022-05-31

    申请号：US17190138

    申请日：2021-03-02

    Applicant: Hitachi Metals, Ltd. ,  NSK Ltd.

    Inventor： Yuta Sugiyama ,  Teruyuki Nakamura ,  Junji Ono ,  Kota Fukuda

    IPC: G01L3/10

    Abstract: A detection circuit for a magnetostrictive torque sensor is configured to detect a torque applied to a magnetostrictive material treated by shot peening. The detection circuit includes a detection coil provided around the magnetostrictive material, and a drive unit for providing alternating current excitation to the detection coil. The torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coil, and the drive unit provides alternating current excitation at a frequency at which a skin effect thickness is not more than an effective depth of the shot peening.

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