公开(公告)号：US20230037362A1

公开(公告)日：2023-02-09

申请号：US17788447

申请日：2021-07-01

Applicant: NSK LTD.

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

IPC: 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.

公开(公告)号：US20220074010A1

公开(公告)日：2022-03-10

申请号：US17416756

申请日：2019-12-11

Applicant: NSK LTD.

Inventor： Kota FUKUDA ,  Junji ONO ,  Teruyuki NAKAMURA ,  Yuta SUGIYAMA

IPC: C21D9/28 ,  G01L3/10 ,  B24C1/10 ,  B24C11/00 ,  C21D7/06

Abstract: A method for manufacturing a magnetostrictive torque sensor shaft (100) to which a sensor portion (2) of a magnetostrictive torque sensor (1) is to be attached includes: a heat treatment step of subjecting an iron-based shaft member to a carburizing, quenching, and tempering process; 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, at least in a position on the shaft member, after the heat treatment step, to which the sensor portion (2) is to be attached; and a surface polishing step of subjecting the shaft member after the shot peening to surface polishing.

公开(公告)号：US20160238112A1

公开(公告)日：2016-08-18

申请号：US15028065

申请日：2014-04-02

Applicant: NSK LTD.

Inventor： Hirotaka KISHIDA ,  Junji ONO

IPC: F16H15/38

CPC classification number: F16H15/38 ,  F16H61/6649

Abstract: Provided is a single-cavity toroidal continuously variable transmission capable of suppressing gyro slippage and achieving mitigation of bearing loss and a longer service life.In the single-cavity toroidal continuously variable transmission, a pitch circle diameter (PCD) of the output-side bearing 46 is smaller than that of the input-side bearing 43 and a ball diameter of the output-side bearing 46 is smaller than that of the input-side bearing 43. 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 46 smaller than that of the input-side bearing 43, a longer service life can be achieved even when the pitch circle diameter (PCD) and ball diameter of the output-side bearing 46 are smaller than those of the input-side bearing 43.

Abstract translation: 提供了一种单腔环形无级变速器，能够抑制陀螺仪打滑，减少轴承损耗和延长使用寿命。 在单腔环形无级变速器中，输出侧轴承46的节圆直径（PCD）小于输入侧轴承43的节圆直径（PCD），输出侧轴承46的球直径小于输出侧轴承46的球直径。 因此，可以抑制作用在低负荷的增速侧的输出侧轴承的球上的离心力。 因此，可以抑制陀螺仪滑移，并且可以实现轴承损失的减轻。 此外，即使输出侧轴承46的凹槽R比小于输入侧轴承43的凹槽R比，即使在输出侧轴承的节圆直径（PCD）和滚珠直径 46小于输入侧轴承43的尺寸。

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：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.