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公开(公告)号：US11698312B2
公开(公告)日：2023-07-11
申请号：US17488494
申请日：2021-09-29
Applicant: NSK LTD. , Proterial, Ltd.
Inventor： Kota Fukuda , Junji Ono , Shinji Okada , Teruyuki Nakamura , Yuta Sugiyama
CPC classification number: G01L3/102 , H10N35/101
Abstract: A torque load member has a detected surface which is configured to face a magnetostrictive torque sensor. The detected surface is a shot peened surface whose magnetic anisotropy directed in a specific direction has been reduced by performing shot peening thereto at an arc height value of 0.31 mmA or more.
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Patent Agency Ranking
公开(公告)号：US11732318B2
公开(公告)日：2023-08-22
申请号：US17416756
申请日：2019-12-11
Applicant: NSK LTD.
Inventor： Kota Fukuda , Junji Ono , Teruyuki Nakamura , Yuta Sugiyama
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.
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公开(公告)号：US20220099505A1
公开(公告)日：2022-03-31
申请号：US17488494
申请日：2021-09-29
Applicant: NSK LTD. , HITACHI METALS LTD.
Inventor： Kota Fukuda , Junji Ono , Shinji Okada , Teruyuki Nakamura , Yuta Sugiyama
Abstract: A torque load member has a detected surface which is configured to face a magnetostrictive torque sensor. The detected surface is a shot peened surface whose magnetic anisotropy directed in a specific direction has been reduced by performing shot peening thereto at an arc height value of 0.31 mmA or more.
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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
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%.
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公开(公告)号：US11774305B2
公开(公告)日：2023-10-03
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
CPC classification number: G01L3/102
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.
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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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