公开(公告)号：US20220244118A1

公开(公告)日：2022-08-04

申请号：US17562469

申请日：2021-12-27

Applicant: Hitachi Metals, Ltd. ,  NSK Ltd.

Inventor： Teruyuki NAKAMURA ,  Yuta SUGIYAMA ,  Yiming JIN ,  Kota FUKUDA

IPC: G01L3/10

Abstract: A magnetostrictive torque sensor includes detection coils formed around a magnetostrictive material made of chrome steel or chrome molybdenum steel, a magnetic ring configured to cover around the detection coils, and a drive unit for providing alternating current excitation to the detection coils at an excitation frequency of 50 kHz or more and 333 kHz or less. A torque applied to the magnetostrictive material is detected based on a change in inductance of the detection coils. The magnetic ring is configured by wrapping around the detection coils with an amorphous tape made of amorphous soft magnetic material in a tape shape. The thickness of the magnetic ring is 1.455 times or more as thick as a skin effect thickness of the magnetostrictive material and less than 1.000 mm.

公开(公告)号：US20250123166A1

公开(公告)日：2025-04-17

申请号：US18704151

申请日：2022-10-05

Applicant: NSK Ltd.

Inventor： Yiming JIN ,  Takashi ONIMOTO ,  Akitoshi FUJIMORI ,  Seigou URAKAMI ,  Kota FUKUDA

IPC: G01L3/10

Abstract: A magnetostrictive torque sensor for detecting a torque applied to a magnetostrictive member having magnetostrictive properties, includes a detection coil arranged on an outer peripheral side of the magnetostrictive member; a magnetic ring composed of a ferromagnetic material arranged on an outer peripheral side of the detection coil; a housing having a facing portion facing the magnetic ring across the detection coil; a plug member closing an opening formed between the magnetic ring and the facing portion; a resin mold section covering the housing while exposing the magnetic ring and the plug member; a cable electrically connected to the detection coil and drawn out from the housing and the resin mold section; and a heat shrinkable tube covering the housing, a portion of the resin mold section, and an end portion of the cable exposed from the housing and the resin mold section.

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.