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

IPC: G01L3/00 ,  G01L3/10 ,  G01L1/12

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：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

IPC: G01L3/10 ,  G01L5/13

CPC classification number: G01L3/102 ,  G01L3/105 ,  G01L5/136

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.

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.

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

IPC: G01L3/00 ,  G01L3/10

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.