公开(公告)号：US20240418586A1

公开(公告)日：2024-12-19

申请号：US18703537

申请日：2022-10-05

Applicant: NSK Ltd.

Inventor： Yiming JIN ,  Akitoshi FUJIMORI ,  Yoshinori KUBO ,  Junji ONO ,  Kota FUKUDA ,  Takahiro ODERA

IPC: G01L3/10

Abstract: A magnetostrictive torque sensor, configured to be mounted around a rotating shaft having a magnetostrictive effect and to detect torque applied to the rotating shaft, is provided with a support member having a cylindrical portion through which the rotating shaft is inserted; a flexible substrate arranged around an outer periphery of the cylindrical portion and having a plurality of coils composed of wiring patterns; and a tightening member that tightens the flexible substrate toward an outer peripheral surface of the cylindrical portion. The tightening member may be a tubular heat-shrinkable tube that shrinks upon heating. A method for manufacturing the magnetostrictive torque sensor includes placing the flexible substrate around the outer periphery of the cylindrical portion of the support member and placing the heat-shrinkable tube around an outer periphery of the flexible substrate; and tightening the flexible substrate toward the outer peripheral surface of the cylindrical portion by heating the heat-shrinkable tube to shrink the heat-shrinkable tube.

公开(公告)号：US20230280219A1

公开(公告)日：2023-09-07

申请号：US18176052

申请日：2023-02-28

Applicant: NSK LTD. ,  Proterial, Ltd.

Inventor： Masahiro KOBAYASHI ,  Kota FUKUDA ,  Hisayoshi FUKUI ,  Takahiro ODERA ,  Akitoshi FUJIMORI ,  Takashi ONIMOTO ,  Yiming JIN

IPC: G01L1/12 ,  G01L5/13

CPC classification number: G01L1/125 ,  G01L5/136

Abstract: The torque measuring device includes: a casing made of a magnetic metal; a rotating shaft rotatably arranged inside the casing and having a magnetostrictive effect section whose magnetic permeability changes according to torque to be transmitted; and a torque sensor arranged around the magnetostrictive effect section and supported by the casing, the torque sensor including a coil unit formed in a cylindrical shape using a flexible substrate having a detection coil that changes voltage in response to changes in the magnetic permeability of the magnetostrictive effect section, and a holder made of rubber or synthetic resin, covering an outer peripheral surface of the coil unit, and having a portion that protrudes from the coil unit on both sides in an axial direction; and the torque sensor supported by the casing with an outer peripheral surface of the holder fitted into an inner peripheral surface of the casing.

公开(公告)号：US20220268649A1

公开(公告)日：2022-08-25

申请号：US17637263

申请日：2021-07-01

Applicant: NSK Ltd.

Inventor： Takahiro ODERA ,  Junji ONO ,  Masahiro KOBAYASHI ,  Kota FUKUDA

IPC: G01L3/10

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.

公开(公告)号：US20220026294A1

公开(公告)日：2022-01-27

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 ,  C21D9/00 ,  C21D8/06

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 steel shot media having a Vickers hardness at least equal to 1100 and at most equal to 1300 and being free of boron, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion is to be attached.

公开(公告)号：US20210278296A1

公开(公告)日：2021-09-09

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.