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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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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：US12281952B2
公开(公告)日：2025-04-22
申请号：US18176098
申请日：2023-02-28
Applicant: NSK LTD. , PROTERIAL, LTD.
Inventor： Masahiro Kobayashi , Kota Fukuda , Hisayoshi Fukui , Takahiro Odera , Haruhiko Tanno , Yoshinori Kubo , Naoki Futakuchi , Ken Okuyama , Teruyuki Nakamura
IPC: G01L3/10
Abstract: The manufacturing method includes: performing testing of samples having the same configuration as the torque measuring device to be manufactured to find a coil balance Cb that is a ratio (R1×R3)/(R2×R4) of a product R1×R3 of resistance values R1 and R3 of one pair of opposite sides of the four sides of a bridge circuit 8, and a product R2×R4 of resistance values R2 and R4 of another pair of opposite sides of the four sides, and a temperature change rate VT of output voltage Vo of a sensor portion 4, and acquiring a relationship X between the coil balance Cb and the temperature change rate VT from the test results; and measuring the resistance values R1, R2, R3, R4 of the four sides to find the coil balance Cb to find the temperature change rate VT from the relationship X for the torque measuring device to be manufactured.
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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
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.
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Patent Agency Ranking
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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公开(公告)号：US20230280222A1
公开(公告)日：2023-09-07
申请号：US18175802
申请日：2023-02-28
Applicant: NSK Ltd. , Proterial, Ltd.
Inventor： Masahiro Kobayashi , Kota Fukuda , Hisayoshi Fukui , Takahiro Odera , Teruyuki Nakamura , Naoki Futakuchi , Ken Okuyama
Abstract: A torque measuring device includes: a coil unit having a detection coil configured to change a voltage in response to a change in magnetic permeability of a magnetostrictive effect section of a rotating shaft; a back yoke arranged coaxially around the coil unit; a holder configured to hold the coil unit and the back yoke; and an electronic circuit including the detection coil and configured to generate an output voltage according to a voltage of the detection coil, a clearance in a radial direction is provided between an outer peripheral surface of the coil unit and an inner peripheral surface of the back yoke, and a range of change in the clearance that accompanies temperature change during use is regulated to a range in which a change in the output voltage is linear with respect to the change in the clearance.
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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：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
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.
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