Patents Assigned to NSK
  • Patent number: 12385793
    Abstract: A torque measuring device includes a bridge circuit in which four detection coils arranged around a magnetostrictive effect section of a rotating shaft are arranged on four sides; and the bridge circuit includes a resistance element connected to at least one of the four sides for adjusting a resistance value of the side.
    Type: Grant
    Filed: February 28, 2023
    Date of Patent: August 12, 2025
    Assignees: NSK LTD., PROTERIAL, LTD.
    Inventors: Masahiro Kobayashi, Kota Fukuda, Takahiro Odera, Naoki Futakuchi
  • Patent number: 12384444
    Abstract: [Problem] To enable an adjustment lever to be operated to a normal position in a case where the adjustment lever is operated in order to hold a steering wheel at an adjusted position, even when positions in the axial direction of a protruding engagement portion and a recessed engagement portion are shifted, and to prevent a locking mechanism from being damaged.
    Type: Grant
    Filed: September 5, 2022
    Date of Patent: August 12, 2025
    Assignee: NSK STEERING & CONTROL, INC.
    Inventors: Hiroto Koitabashi, Yuta Manaka, Hiroshi Kakita, Rei Mitsui, Nobuhiro Koujiya
  • Patent number: 12377737
    Abstract: A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and an onboard device 6 which is installed in the moving body 2 and which is electrically connected to the power reception device 5, wherein the power reception device 5 can transmit received power to the onboard device 6, and the power reception coil 51 includes a stacked plurality of spiral coil layers 52a and 52b.
    Type: Grant
    Filed: September 10, 2020
    Date of Patent: August 5, 2025
    Assignees: THE UNIVERSITY OF TOKYO, BRIDGESTONE CORPORATION, NSK Ltd.
    Inventors: Hiroshi Fujimoto, Osamu Shimizu, Keizo Akutagawa, Yasumichi Wakao, Isao Kuwayama, Daisuke Gunji
  • Publication number: 20250244205
    Abstract: A detection method for detecting a state of a bearing device including a tapered roller bearing includes applying an AC voltage to an electric circuit including an outer member, an inner member, and a plurality of rollers in a state in which a predetermined load is applied to the bearing device; measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied; and based on the impedance and the phase angle, deriving an oil film thickness and a metal contact ratio between the inner member and the plurality of rollers or between the inner member and at least one of the plurality of rollers by using a calculation formula corresponding to the electric circuit.
    Type: Application
    Filed: March 7, 2023
    Publication date: July 31, 2025
    Applicant: NSK LTD.
    Inventors: Taisuke MARUYAMA, Yoji HORII, Misaki NIWA, Shunsuke IWASE
  • Patent number: 12365382
    Abstract: A steering device includes a first steering column, a second steering column, an actuator device, a first attachment portion, and a second attachment portion. The first attachment portion includes an opening portion and a housing portion including a second arc portion. A protrusion portion has a first arc portion and a linear portion, and the first attachment portion has the opening portion and the housing portion. A minimum width of the opening portion in the first attachment portion is defined as a first distance, and a minimum distance between two intersections of a straight line passing through a center of the housing portion and an edge of the housing portion is defined as a second distance.
    Type: Grant
    Filed: March 9, 2023
    Date of Patent: July 22, 2025
    Assignee: NSK STEERING & CONTROL, INC.
    Inventor: Koki Maeda
  • Publication number: 20250230846
    Abstract: A power transmission device includes: a fixing member having a cylindrical surface; an output shaft having a facing surface facing the cylindrical surface; an input shaft having a pressing portion disposed between the cylindrical surface and the facing surface; and a pair of rolling elements. The facing surface includes a recessed surface. The recessed surface has a bottom surface and a pair of pressed surfaces. The bottom surface has a central surface and a pair of cam surfaces. A distance between the cam surface and the cylindrical surface increases from the central surface toward the pressed surface. A distance between the cam surface and the cylindrical surface is smaller than a diameter of the rolling element in the portion closer to the central surface, and is greater than the diameter of the rolling element in the portion closer to the pressed surface.
    Type: Application
    Filed: December 19, 2024
    Publication date: July 17, 2025
    Applicant: NSK-WARNER K.K.
    Inventor: Nariaki TAMURA
  • Publication number: 20250215931
    Abstract: A resin cage includes at least one circular ring portion and a plurality of column portions extending in an axial direction from the circular ring portion. Balls are rotatably held by cylindrical or partially cylindrical pockets formed between adjacent column portions. The circular ring portion has a guide surface guided by an inner circumferential surface of an outer ring or an outer circumferential surface of an inner ring. A roundness of the guide surface is 5 ?m or less, differences between angles formed by centers of adjacent pockets P and 360°/number of pockets are all within ±0.1°, and orientations of centers C of all the pockets P are oriented to one side in a circumferential direction and one side in the axial direction from an outer diameter side toward an inner diameter side.
    Type: Application
    Filed: February 7, 2023
    Publication date: July 3, 2025
    Applicant: NSK LTD.
    Inventors: Hironori SUZUKI, Yamato OKAZAKI
  • Publication number: 20250215939
    Abstract: A reverse-input blocking clutch includes a housing, an input shaft, an output shaft, a pair of engaging elements, a first bearing mechanism provided between the input shaft and the housing, and a second bearing mechanism provided between the output shaft and the housing. At least one of the input shaft, the output shaft, and the housing has a raceway surface which contacts at least one rolling element of the first bearing mechanism and the second bearing mechanism.
    Type: Application
    Filed: December 22, 2022
    Publication date: July 3, 2025
    Applicant: NSK LTD.
    Inventor: Nagao DOHI
  • Publication number: 20250220783
    Abstract: A ring-shaped member is induction-heated by supplying a current to an induction coil. An induction heating step includes induction-heating the ring-shaped member using an induction coil disposed at a radially inward position of the ring-shaped member in a state in which no substantial coil is disposed at a radially outward position of the ring-shaped member, or induction-heating the ring-shaped member using an induction coil disposed at the radially outward position of the ring-shaped member in a state in which no substantial coil is disposed at the radially inward position of the ring-shaped member. Effective lengths of the induction coils are set to be larger than an axial length of the ring-shaped member.
    Type: Application
    Filed: March 21, 2025
    Publication date: July 3, 2025
    Applicant: NSK Ltd.
    Inventors: Naoyuki ONO, Wenyu ZHANG, Kinya KAWAKAMI, Shinji IZUMI
  • Patent number: 12345297
    Abstract: Provided are: an environment-friendly synthetic resin cage that uses a 100% biomass raw material and therefore aims for carbon neutrality while having performance as a bearing in a conventional process; and a rolling bearing incorporating said cage. A crown-type cage for holding a plurality of rolling elements incorporated between an inner ring and an outer ring is produced with a polyamide resin composition containing a 100% biomass-derived raw material with a reinforcing material contained therein, wherein the raw material is polyamide 410 and 10-40 wt % of the reinforcing material is contained therein.
    Type: Grant
    Filed: January 25, 2023
    Date of Patent: July 1, 2025
    Assignee: NSK LTD.
    Inventors: Taiki Yoshima, Yoshitaka Naganuma
  • Publication number: 20250207638
    Abstract: A detection method for detecting a state of a bearing device including a slide bearing includes: applying an AC voltage to an electric circuit including the slide bearing and a rotation shaft; measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied; and deriving an oil film thickness and a metal contact ratio between the slide bearing and the rotation shaft based on the impedance and the phase angle, in which the oil film thickness and the metal contact ratio are derived by using a calculation formula corresponding to an electric circuit constructed by a line contact generated between the slide bearing and the rotation shaft.
    Type: Application
    Filed: March 7, 2023
    Publication date: June 26, 2025
    Applicant: NSK LTD.
    Inventor: Taisuke MARUYAMA
  • Publication number: 20250202391
    Abstract: The current control apparatus includes a component temperature estimating unit configured to estimate component temperatures of plural electronic components, respectively, based on a current value flowing to each of the plural electronic components included in a current control circuit and a detected temperature detected by a temperature detecting element disposed in the vicinity of the current control circuit, and limits output current outputted from the current control circuit to a load based on the estimated component temperature. The component temperature estimating unit estimates power loss of the electronic component and estimates the component temperature based on a sum of a first value obtained by filtering the power loss through plural first low-pass filters connected in parallel or in series with each other and a second value obtained by filtering the detected temperature detected by a temperature detection circuit through a second low-pass filter.
    Type: Application
    Filed: December 15, 2023
    Publication date: June 19, 2025
    Applicant: NSK STEERING & CONTROL, INC.
    Inventor: Masahiko FUJITA
  • Publication number: 20250192705
    Abstract: A current control apparatus includes a component temperature estimating unit configured to estimate the component temperature of the electronic component, for each of a plurality of electronic components based on the current value flowing in each of the plurality of electronic components included in the current control circuit and the detected temperature detected by the temperature detecting element disposed in the vicinity of the current control circuit, a reduction coefficient setting unit configured to set a plurality of different reduction coefficients for a plurality of different component temperatures included in the component temperature estimated for each of the plurality of electronic components; a selecting unit configured to select any one of the reduction coefficients for each of the plurality of electronic components; and a current limiting unit configured to control output current outputted from the current control circuit to a load based on the selected reduction coefficient.
    Type: Application
    Filed: December 15, 2023
    Publication date: June 12, 2025
    Applicant: NSK STEERING & CONTROL, INC.
    Inventor: Masahiko FUJITA
  • Patent number: 12319338
    Abstract: A steering column has a cylindrical front-side column and a cylindrical rear-side column having a front-end portion that is connected to a rear-end portion of the front-side column. The steering shaft has a front-side shaft rotatably supported inside the front-side column, a rear-side shaft rotatably supported inside the rear-side column and has a rear-end portion to which the steering wheel is attached, and a universal joint connecting the rear-end portion of the front-side shaft and the front-end portion of the rear-side shaft. The front-end portion of the front-side column is always arranged above a portion of the extension line of the center axis of the rear-side column which exists at the same location in the front-rear direction as the front-end portion.
    Type: Grant
    Filed: November 21, 2023
    Date of Patent: June 3, 2025
    Assignee: NSK, LTD.
    Inventor: Yoshifumi Kurokawa
  • Publication number: 20250171074
    Abstract: Provided are an electric drive device and an electric power steering device that reduce noise superimposed on a detection value detected by a current detection element in a path from the current detection element to a control circuit. The electric drive device includes a motor and an electronic control device including a circuit board. With a position on an extension line in an axial direction of a shaft as a reference position, a mounting area for a first motor driver circuit, a mounting area for a first current detection element, a mounting area for a plurality of drive elements of a first inverter circuit, and a disposition area for a first coil wiring are disposed in this order from the reference position to one side in a first direction.
    Type: Application
    Filed: October 26, 2023
    Publication date: May 29, 2025
    Applicant: NSK Steering & Control, Inc.
    Inventor: Akio MARUHASHI
  • Patent number: 12313495
    Abstract: A state determination device for a hub unit bearing includes: a holding unit that holds reference information of magnetic characteristics at a predetermined position in the vicinity of a flange portion included in the hub unit bearing; an acquisition unit that acquires measurement information of the magnetic characteristics at the predetermined position of the hub unit bearing; a derivation unit that derives a change amount between the reference information held by the holding unit and the measurement information acquired by the acquisition unit; and a determination unit that determines a state of the hub unit bearing based on the change amount derived by the derivation unit. The predetermined position is a position at which the magnetic characteristics vary with a stress change with respect to the flange portion.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: May 27, 2025
    Assignee: NSK LTD.
    Inventor: Daisuke Kobayashi
  • Publication number: 20250153764
    Abstract: A rotation limiting device includes: a first member having a first protrusion; a second member having a second protrusion disposed on an axial one side with respect to the first protrusion, the second member being disposed around the first member and configured to rotate relative to the first member; at least one intermediate member, disposed between the first member and the second member in a radial direction and supported in a relatively rotatable manner with respect to the first and the second members, including a side plate portion, an intermediate side first protrusion protruding from an axial other side surface of the side plate portion, and an intermediate side second protrusion protruding from an axial one side surface of the side plate portion; and a rotation support mechanism configured to support the second member around the first member in a relatively rotatable manner with respect to the first member.
    Type: Application
    Filed: December 20, 2022
    Publication date: May 15, 2025
    Applicant: NSK STEERING & CONTROL, INC.
    Inventor: Kazuyuki HATANAKA
  • Patent number: 12297862
    Abstract: A deep groove ball bearing includes an outer ring, an inner ring, a plurality of balls, and a seal member. An axial cross-sectional width is smaller than a radial cross-sectional height, a thickness of the inner ring is greater than a thickness of the outer ring, and a pitch diameter of the ball is larger than a median diameter between an inner diameter of the inner ring and an outer diameter of the outer ring A radial dimension between an outer diameter of a shoulder portion of the inner ring and an inner diameter of the seal member is greater than the thickness of the outer ring. As a result, width and weight can be reduced, a load capacity can be secured, grease leakage can be prevented, and a service lifespan can be extended.
    Type: Grant
    Filed: January 14, 2022
    Date of Patent: May 13, 2025
    Assignee: NSK LTD.
    Inventors: Eri Watabe, Hiroshi Ishiwada, Kento Takeuchi, Shigeki Maehara, Takashi Kuramochi, Ahmadfirdaus Binabdulhalim
  • Patent number: 12296885
    Abstract: A rotation angle detection device including: an angular position calculation unit configured to calculate angular position information representing an angular position of the motor rotation shaft based on a first sensor signal of the first sensor; a rotation number detection unit configured to detect a rotation number of the motor rotation shaft based on a second sensor signal of a second sensor and output rotation number information representing the rotation number; a rotation angle calculation unit configured to calculate rotation angle information indicating a rotation angle of the motor rotation shaft based on the angular position information and the rotation number information; and a power supply unit configured to stop supplying power to the first sensor, the angular position calculation unit and the rotation angle calculation unit and to supply power to the second sensor and the rotation number detection unit when the power switch is off.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: May 13, 2025
    Assignee: NSK LTD.
    Inventors: Takayuki Kobayashi, Dai Suzuki, Shin Kumagai, Hidetaka Nakamura
  • Publication number: 20250146529
    Abstract: Provided are a retainer cage and a bearing device capable of suppressing fluctuation of torque. A bearing device of the present disclosure includes: an inner ring having an outer circumferential track surface on an outer circumferential surface; an outer ring having an inner circumferential track surface on an inner circumferential surface; a plurality of balls disposed between the outer circumferential track surface and the inner circumferential track surface; and a retainer cage.
    Type: Application
    Filed: November 30, 2022
    Publication date: May 8, 2025
    Applicant: NSK Ltd.
    Inventors: Shinichiro HAYASHI, Hironari SAKODA, Yasuhiro ARAKI, Masayuki SATO, Satoshi SHIMAZAKI, Daiju TAKAHASHI, Yusuke YOROZU, Shingo IMAI, Aya KIKUCHI