Patents Assigned to NSK Ltd.
  • Patent number: 12024222
    Abstract: A steering device includes an input shaft coupled to a steering wheel and extending in an axial direction, an output shaft fitted to the input shaft and capable of relatively moving in the axial direction with respect to the input shaft, an upper column having a cylindrical shape that is disposed on a radially outer side of the input shaft and rotatably supports the input shaft, a lower column having a cylindrical shape that is fitted to the upper column and capable of relatively moving in the axial direction with respect to the upper column, a column bracket that includes a side plate portion located on the side of the upper column and is detachable from a vehicle body, a support member provided on the upper column, and a pin that is provided to extend along the radial direction and penetrate through the side plate portion and the support member.
    Type: Grant
    Filed: December 9, 2021
    Date of Patent: July 2, 2024
    Assignee: NSK LTD.
    Inventors: Tomonori Morishima, Tasuku Oishi
  • Patent number: 12024248
    Abstract: A vehicle steering device includes a target steering torque generation unit configured to generate target steering torque for a reaction force motor, and a torque correction value calculation unit configured to generate a torque signal Tref_p in accordance with road surface reaction force acting on a steering wheel of a vehicle. The torque correction value calculation unit generates the torque signal Tref_p by separating estimated road surface reaction force into a low-frequency component and a high-frequency component, providing level restriction on each of the low-frequency component and the high-frequency component, and adding torque values converted from the low-frequency component and the high-frequency component after the level restriction. The target steering torque generation unit generates the target steering torque by adding the torque signal Tref_p and a torque signal Tref_a generated based on a predetermined basic map in accordance with at least a vehicle speed and a steering angle of the vehicle.
    Type: Grant
    Filed: February 5, 2021
    Date of Patent: July 2, 2024
    Assignee: NSK LTD.
    Inventor: Keitarou Tanaka
  • Publication number: 20240209892
    Abstract: A roller includes chamfered portions and roller inclined surfaces formed on both axial ends of a roller outer circumferential surface. When in a cross section taken along a plane including a rotation axis of the roller and a bearing central axis, an intersection angle between a tangent line of the roller inclined surface at the first position of the roller inclined surface corresponding to an end portion of a guide surface and a perpendicular line of the rotation axis is defined as ?, an intersection angle between a tangent line of the roller inclined surface at the second position corresponding to a boundary between the chamfered portion and the roller inclined surface and a perpendicular line of the rotation axis is defined as ?, and an intersection angle between the guide surface and a perpendicular line of the bearing central axis is defined as ?, ?<?<? is satisfied.
    Type: Application
    Filed: March 4, 2022
    Publication date: June 27, 2024
    Applicant: NSK LTD.
    Inventors: Takashi MURAI, Yoshinari KAGOTA
  • Publication number: 20240209927
    Abstract: The nut according to the present disclosure includes a nut main body and a circulation component. The nut main body includes a housing part having a bow shape when viewed from an axial direction, a seat surface forming a bottom surface of the housing part, a through hole passing through the seat surface, and a pair of side surfaces arranged on both sides in the axial direction with respect to the housing part.
    Type: Application
    Filed: December 6, 2022
    Publication date: June 27, 2024
    Applicant: NSK Ltd.
    Inventors: Shuhei YUMIBA, Yasumi WATANABE, Yasuaki ABE
  • Patent number: 12017310
    Abstract: Axial relative movement of an auxiliary member (30) and a hub body (22z) is performed, the hub body (22z) and an inner race (21) are combined with each other in an axial direction, and a part of the hub body (22z) deformed by a blade (33) of the auxiliary member (30) is disposed inside an engagement concave portion (26) of the inner race (21).
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: June 25, 2024
    Assignee: NSK LTD.
    Inventors: Nobuyuki Hagiwara, Sonji Ryu
  • Patent number: 12017233
    Abstract: Provided is a nozzle structure, a blow device, and a manufacturing method for parts, a bearing, a linear motion device, a steering device, a vehicle, and a mechanical device which can uniformly and satisfactorily perform various processes with fluid over a wide range on a processing target member. The nozzle structure includes an inner member, an outer member surrounding the inner member, and a laminar flow path formed between an outer surface of the inner member and an inner surface of the outer member to allow fluid to flow. The blow device or the mechanical device having the nozzle structure can process the inner member by flowing the fluid in the flow path.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: June 25, 2024
    Assignee: NSK LTD.
    Inventor: Kouhei Dobashi
  • Publication number: 20240200617
    Abstract: The efficiency of assembling a reverse-input blocking clutch including an elastic member is improved. A reverse-input blocking clutch 1 includes a pressed member 2 having a pressed surface 7, an input member 3 having an input-side engaging portion 22, an output member 4 having an output-side engaging portion 33, an engaging element 5 having a pressing surface 45, an input-side engaged portion 50, and an output-side engaged portion and arranged between the pressed surface 7 and the output-side engaging portion 33 with respect to a first direction which is a direction of moving toward or away from the pressed surface 7, an elastic member 6 that elastically urge the pressing surface 45 toward the pressed surface 7 in the first direction, and a displacement prevention means for preventing relative displacement in the axial direction of the engaging element 5 with respires to the output member 4.
    Type: Application
    Filed: December 27, 2022
    Publication date: June 20, 2024
    Applicant: NSK Ltd.
    Inventors: Nagao DOHI, Shohei KANEKO
  • Patent number: 12012165
    Abstract: Provided is a control device for an electric power steering device including a first control portion that derives a first command value based on a steering torque and a second control portion that derives a second command value based on a target command value for a driving support function, where the first control portion generates the first command value by extracting a command value corresponding to a vibration suppression component from a command value including the vibration suppression component derived from the steering torque, adjusting the derived command value according to an operating state of a function of the second control portion, and adding the extracted command value to the adjusted command value.
    Type: Grant
    Filed: October 29, 2021
    Date of Patent: June 18, 2024
    Assignee: NSK LTD.
    Inventor: Tetsuya Kitazume
  • Patent number: 12013307
    Abstract: A method for diagnosing a rolling device (10) including an outer member (1), an inner member (3), and rolling elements (5) includes: applying an AC voltage to an electric circuit including the outer member (1), the rolling elements (5), and the inner member (3); measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied; and measuring a dielectric constant of a lubricant at least one of between the outer member (1) and the rolling elements (5) and between the inner member (3) and the rolling elements (5) based on the measured impedance and the measured phase angle.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: June 18, 2024
    Assignee: NSK LTD.
    Inventors: Taisuke Maruyama, Masayuki Maeda, Ken Nakano
  • Publication number: 20240191789
    Abstract: A multi-row ball screw includes a nut having a plurality of spiral grooves on an inner peripheral surface thereof, a screw shaft having a plurality of spiral grooves on an outer peripheral surface thereof, and a plurality of balls disposed so as to be rollable on rolling paths constituted by the plurality of spiral grooves of the nut and the plurality of spiral grooves of the screw shaft. The spiral groove of the nut includes a U-shaped first spiral groove having left and right flanks that are respectively able to come into contact with two-row balls and separated from each other in an axial direction, and two second spiral grooves continuous with each row of the first spiral groove and each having left and right flanks that are able to come into two-point contact with the ball.
    Type: Application
    Filed: March 23, 2022
    Publication date: June 13, 2024
    Applicant: NSK LTD.
    Inventor: Takayuki YABE
  • Patent number: 12009766
    Abstract: A motor control device includes temperature detection elements that are mounted on a circuit board on which a first power conversion circuit and a second power conversion circuit are mounted and are arranged at a position between the first power conversion circuit and the second power conversion circuit.
    Type: Grant
    Filed: March 3, 2023
    Date of Patent: June 11, 2024
    Assignee: NSK LTD.
    Inventor: Akio Maruhashi
  • Publication number: 20240183434
    Abstract: A nut of a ball screw is formed with, in a notch portion, an elongated hole that penetrates in a radial direction, and whose longitudinal direction is formed along a lead angle and parts of both longitudinal side surfaces parallel to each other guide balls. A circulation part includes: a first circulation component that is disposed in the notch portion so as to abut against a bottom wall surface of the notch portion and has a tongue portion accommodated in the elongated hole; a second circulation component that is disposed in the notch portion so as to cover the first circulation component and accommodated in the elongated hole, and has a wall portion facing the tongue portion; and a higher strength pipe that is disposed in an abutting surface where the first and second circulation components abut against each other, constitutes a part of a ball circulation path.
    Type: Application
    Filed: March 25, 2022
    Publication date: June 6, 2024
    Applicant: NSK LTD.
    Inventor: Takayuki YABE
  • Publication number: 20240183750
    Abstract: Disclosed are a state monitoring device and a state monitoring method for a ball screw, which enable appropriate collection of data to accurately diagnose the state of the ball screw. The state monitoring device monitors the state of the ball screw having a screw shaft, a nut, and a plurality of balls. The state monitoring device includes a drive control unit for controlling a drive unit (servo motor) to cause the screw shaft and the nut to move relative to each other at a constant speed for one or more reciprocating motions under an unloaded condition, and a data collection unit for collecting, as data, physical quantities related to the ball screw while the drive unit is controlled by the drive control unit.
    Type: Application
    Filed: April 13, 2021
    Publication date: June 6, 2024
    Applicant: NSK LTD.
    Inventors: Keisuke MATSUMURA, Satoshi HASHIMOTO, Yuki YAMADA
  • Publication number: 20240183400
    Abstract: In a multi-row bearing, an inner ring raceway groove at one end portion in an axial direction is formed over groove shoulders on both sides in the axial direction with respect to a groove bottom, and an inner ring raceway groove at an intermediate portion in the axial direction is formed over a groove shoulder on one side in the axial direction from a groove bottom. In addition, an outer ring raceway groove at the other end portion in the axial direction is formed over groove shoulders on both sides in the axial direction with respect to a groove bottom, and an outer ring raceway groove at the intermediate portion in the axial direction is formed over a groove shoulder on one side in the axial direction from a groove bottom.
    Type: Application
    Filed: March 29, 2022
    Publication date: June 6, 2024
    Applicant: NSK LTD.
    Inventor: Takayuki YABE
  • Patent number: 11993303
    Abstract: A steering device includes a telescopic steering shaft that extends in a first direction, and a cylindrical outer steering column that rotatably supports the steering shaft. The steering column includes a lower column and an upper column having one end slidably attached to the lower column and the other end on which a bearing that supports the steering shaft is provided. The upper column includes a clamp that is externally slidably fitted to the lower column and that has a slit extending in the first direction, and a cylindrical part that has a cylindrical shape and that has one end continuous with the clamp and the other end blocked by the bearing being internally fitted. The cylindrical part has an air hole that is spaced apart from the one end of the cylindrical part and that penetrates an outer peripheral surface and an inner peripheral surface of the cylindrical part.
    Type: Grant
    Filed: March 25, 2021
    Date of Patent: May 28, 2024
    Assignee: NSK LTD.
    Inventors: Tomohiro Ikuta, Yoshiyuki Sato, Suguru Sugishita, Hirotaka Shimizu
  • Publication number: 20240167546
    Abstract: A table device includes a ball screw including a male screw member extending in an axial direction and a female screw member meshing with the male screw member and movable in the axial direction according to rotation of the male screw member, a slide device that movably supports the female screw member, and a fixing member to which the slide device is fixed. The fixing member includes a first wall section extending in a first direction and a second wall section extending in a second direction crossing the first direction in a cross section including an axis of the male screw member.
    Type: Application
    Filed: March 4, 2022
    Publication date: May 23, 2024
    Applicant: NSK LTD.
    Inventor: Kenichiro WADA
  • Publication number: 20240165753
    Abstract: A method of manufacturing a ball screw device includes a nut unit preparation step, a screw shaft preparation step, and an assembly step. In the nut unit preparation step, a nut unit is prepared in which a circulation component, a ball, and a temporary shaft that prevents the ball from falling off are assembled to a nut provided with an inner peripheral track surface. In the screw shaft preparation step, a screw shaft provided with an outer peripheral track surface is prepared. In the assembly step, after the nut unit preparation step and the screw shaft preparation step, the temporary shaft of an arbitrary nut unit is replaced with an arbitrary screw shaft to manufacture the ball screw device.
    Type: Application
    Filed: February 2, 2022
    Publication date: May 23, 2024
    Applicant: NSK Ltd.
    Inventors: Wei XU, Takayuki YABE, Toshiaki SUZUKI
  • Publication number: 20240167512
    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: Application
    Filed: January 25, 2023
    Publication date: May 23, 2024
    Applicant: NSK LTD.
    Inventors: Taiki YOSHIMA, Yoshitaka NAGANUMA
  • Publication number: 20240159623
    Abstract: A vibration diagnosis device is configured to diagnose vibration of a diagnosis target on the basis of an input signal from outside. The vibration diagnosis device includes a vibration sensor configured to detect the vibration of the diagnosis target, a filtering unit configured to extract a prescribed wavelength band from a waveform of a signal detected by the vibration sensor, and an arithmetic processing unit configured to apply a frequency analysis to the filtered waveform, which is obtained by the filtering unit, to generate spectral data. When, on the basis of the input signal, the arithmetic processing unit does not generate the spectral data, the arithmetic processing unit calculates at least one fundamental vibration statistic from the waveform of the signal detected by the vibration sensor and diagnoses the presence/absence of an abnormality of the diagnosis target.
    Type: Application
    Filed: February 10, 2022
    Publication date: May 16, 2024
    Applicant: NSK LTD.
    Inventors: Yasushi MUTOH, Fumiko OHFUJI
  • Patent number: D1031548
    Type: Grant
    Filed: February 3, 2022
    Date of Patent: June 18, 2024
    Assignee: NSK LTD.
    Inventor: Kazuhiro Ohira