Patents Assigned to JTEKT Corporation
  • Publication number: 20210140477
    Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of rolling elements, and a cage. The cage includes an annular body, a plurality of cage prongs, and guide portions placed inward of the cage prongs in the radial direction of the cage such that the guide portions extend from a radially inner part of the annular body toward a second side in the axial direction of the cage, the guide portions being configured to position the cage by making contact with an inner ring raceway. The cage has a groove so as to connect pockets adjacent to each other in the circumferential direction, the groove being configured such that lubricant is present in the groove and a groove width of the groove is increased in the radial direction in the center of the groove in the circumferential direction.
    Type: Application
    Filed: November 2, 2020
    Publication date: May 13, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Shota AKIMOTO, Yuya YAMAMOTO, Masayuki MURAKAMI
  • Publication number: 20210128389
    Abstract: An assist device includes a first worn component worn on at least one of a shoulder and a chest of a user, a second worn component worn on one of a hip and a pair of right and left legs of the user, a belt member provided along a back side of the user over the first worn component and the second worn component, an actuator provided on one of the first worn component and the second worn component, a position detection unit configured to obtain a position parameter indicating a position of the user, and a controller configured to obtain a required output in a direction to wind up the belt member from the actuator based on the position parameter and configured to control operation of the actuator.
    Type: Application
    Filed: October 30, 2020
    Publication date: May 6, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Hiromichi OHTA, Kazuyoshi OHTSUBO, Tomoki ARAI, Yoshitaka YOSHIMI
  • Publication number: 20210131549
    Abstract: A worm reducer includes a worm shaft; a worm wheel; a housing that houses the worm shaft and the worm wheel; a bearing that holds the worm shaft inside the housing; a coil spring that contacts an outer peripheral surface of the bearing and applies an urging force toward the worm wheel; and a preload member that is screwed into and fixed to the housing and pressurizes the coil spring. A winding direction of the coil spring is different from a winding direction of a thread of the preload member, and contact resistance between the coil spring and the preload member is greater than contact resistance between the coil spring and the bearing.
    Type: Application
    Filed: October 27, 2020
    Publication date: May 6, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Naofumi KAWAMURA, Hirofumi UEDA
  • Publication number: 20210132578
    Abstract: A life expectancy prediction system for a target tool includes a processing machine body, a detector to detect a state data, a learned model storage unit to store learned models generated by executing machine learning using training datasets, including an explanatory variable and an objective variable, the explanatory variable being the state data and the objective variable being a number of first remaining machining times, the learned model storage unit being to store the learned models, each for each of the tools and a remaining machining times prediction unit to select, based on the state data, one learned model and predict a number of second remaining machining times, using the one learned model and the state data.
    Type: Application
    Filed: October 20, 2020
    Publication date: May 6, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Natsuki YABUNE, Toshihiro YONEZU, Koichi KATO, Yuki ISHIGURE
  • Publication number: 20210131536
    Abstract: A rack biasing device includes a rack guide configured to guide movement of a rack shaft, a cylindrical guide member attached to a rack housing, an annular first sealing member configured to provide a seal between the guide member and the rack guide, a biasing member disposed on one side of the rack guide opposite to the rack shaft, an engaging member configured to cause the biasing member to generate biasing force to push the rack shaft toward a pinion shaft, and a second sealing member configured to provide a seal between the guide member and the rack guide, and abut against the engaging member. The rack guide has an annular distributing portion in an end portion that faces the engaging member.
    Type: Application
    Filed: October 22, 2020
    Publication date: May 6, 2021
    Applicant: JTEKT CORPORATION
    Inventor: Hirotaka NOGUCHI
  • Patent number: 10994766
    Abstract: A steering system that is telescopically extendable and retractable using a motor driving force includes a motor, a telescopic steering shaft, a tube that supports the steering shaft such that the steering shaft is rotatable and that is movable with telescopic movement of the steering shaft, and a driving force transmission device that transmits a rotational driving force of the motor to the tube. The driving force transmission device includes a driving force converter that converts the rotational driving force of the motor to a linear driving force, and a coupling member that couples the driving force converter to the tube. The coupling member is breakable by an impact force applied thereto through the steering shaft and the supporting member during a secondary collision so as to decouple the driving force converter from the tube.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: May 4, 2021
    Assignee: JTEKT CORPORATION
    Inventors: Shoji Ishimura, Hidenobu Tanaka, Yuji Takahashi
  • Patent number: 10994336
    Abstract: A quality estimation device for an additive product includes an imaging device configured to illuminate a region including a molding surface during manufacturing of the additive product and image the region, when manufacturing the additive product at a molding position by irradiating with a light beam and a material powder melting and solidifying, a luminance acquisition unit acquires a luminance obtained by quantifying a brightness of a light reflected by at least the molding surface of the region in an image in which the imaging device images the region, and a molding density estimation unit estimates a molding density indicating a density of the material powder in a solidified state after melting based on the luminance of the molding surface acquired by the luminance acquisition unit. The material powder is supplied to the molding position.
    Type: Grant
    Filed: June 4, 2020
    Date of Patent: May 4, 2021
    Assignee: JTEKT CORPORATION
    Inventors: Takaya Nagahama, Hiroyuki Hoshino, Takashi Mizoguchi, Makoto Tano
  • Patent number: 10994725
    Abstract: A four-wheel-drive vehicle including a powertrain operable to adjust a front- and rear-wheel driving force ratio that is a ratio between a driving force of front wheels and a driving force of rear wheels includes a control device that controls the powertrain and adjusts the front- and rear-wheel driving force ratio so as to reduce the driving force of the front wheels that are steered wheels, when it is detected that emergency avoidance to avoid collision with an avoidance target ahead in a traveling direction is necessary.
    Type: Grant
    Filed: June 5, 2019
    Date of Patent: May 4, 2021
    Assignee: JTEKT CORPORATION
    Inventor: Hiroki Yajima
  • Patent number: 10996691
    Abstract: A pressure reducing valve device includes a first body; a second body; a valve mechanism accommodated in the first body, and including a valve seat and a valve element; and a piston that is accommodated in the second body, defines a pressure reducing chamber, and is configured to move in accordance with a pressure in the pressure reducing chamber so as to move the valve element. The first body is connected to an inner portion of a connection portion having a bottomed cylindrical shape. The connection portion is provided in the second body to protrude outward. The valve seat is held between the first body and the second body in a direction in which the first body and the second body are attached to each other such that the valve seat is fixed in a flow passage.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: May 4, 2021
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Nakano, Toshikatsu Kubo, Shota Yamamato, Akira Yamashita, Yutaka Hotta, Eiji Okawachi
  • Publication number: 20210122239
    Abstract: A drive device for a vehicle includes an electric motor, a speed reduction device configured to reduce the speed of rotation transferred from the electric motor, and a drive force distribution device that distributes and outputs a drive force of the electric motor that is input via the speed reduction device to a first output rotary member and a second output rotary member. The speed reduction device has a first gear member, a second gear member, a coupling member, and a moving mechanism.
    Type: Application
    Filed: October 15, 2020
    Publication date: April 29, 2021
    Applicant: JTEKT CORPORATION
    Inventor: Noriyuki FUJII
  • Publication number: 20210123439
    Abstract: An electric oil pump apparatus includes a housing, an electric motor, an oil pump, a shaft, a first bearing, and a second bearing. The electric motor is housed in the housing. The oil pump is provided in the housing and positioned on a first side in an axial direction with respect to the electric motor so as to be adjacent to the electric motor, and includes a pump rotational element rotatable coaxially with a motor rotor. The motor rotor and the pump rotational element are fitted to the shaft to be rotatable together with the shaft. The first bearing is disposed on the first side with respect to the pump rotational element, and supports the shaft while allowing rotation relative to the housing. The second bearing is disposed on a second side with respect to the pump rotational element, and supports the shaft while allowing rotation relative to the housing.
    Type: Application
    Filed: October 16, 2020
    Publication date: April 29, 2021
    Applicant: JTEKT CORPORATION
    Inventor: Daisuke IIMURA
  • Publication number: 20210123487
    Abstract: A vehicle drive device includes: an electric motor; a multi-plate clutch including a plurality of clutch plates; a pressing mechanism configured to press the multi-plate clutch; an output rotary member to which a drive force of the electric motor is transferred through the multi-plate clutch; and a control device configured to control the electric motor and the pressing mechanism. The control device is configured to control the pressing mechanism using information on the result of test operation performed while the vehicle is stationary.
    Type: Application
    Filed: October 14, 2020
    Publication date: April 29, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Wataru HIRATA, Tetsuya YAMAZAKI
  • Publication number: 20210122411
    Abstract: A ball screw nut includes a nut part and a pulley part integrally molded with the nut part on the outer peripheral side of the nut part and having external teeth. The pulley part has a cylindrical portion extending in an axial direction and facing the nut part in a radial direction, and an extended portion extending radially inward from the cylindrical portion and facing the nut part in the axial direction. A restriction part for restricting relative rotation of the nut part and the pulley part is provided between a facing surface of the extended portion facing the nut part and a facing surface of the nut part facing the extended portion.
    Type: Application
    Filed: October 21, 2020
    Publication date: April 29, 2021
    Applicant: JTEKT CORPORATION
    Inventor: Yoshio KONDO
  • Publication number: 20210122413
    Abstract: A steering control device includes an electronic control unit. The electronic control unit is configured to perform end contact relaxation control for correcting a current command value such that a decrease of an end separation angle indicating a distance of an absolute steering angle from an end-position-corresponding angle is limited when the end separation angle is equal to or less than a predetermined angle and to perform partial release control for decreasing a correction value of the current command value due to execution of the end contact relaxation control based on a steering torque which is input to a steering system when a vehicle is intended to travel while turning at the time of execution of the end contact relaxation control.
    Type: Application
    Filed: October 14, 2020
    Publication date: April 29, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Takafumi YAMAGUCHI, Takahiro TOKO, Nobuaki KATAOKA, Shingo NITTA, Yukinobu EZAKI
  • Publication number: 20210122370
    Abstract: A control apparatus configured to control a four-wheel drive vehicle configured to drive right and left front wheels and right and left rear wheels includes an electronic control unit. The electronic control unit calculates a vehicle body speed based on rotation speeds of the wheels and a cumulative value of accelerations in a longitudinal direction of the vehicle. The accelerations are detected by an acceleration sensor. The electronic control unit calculates the vehicle body speed based on the cumulative value of the accelerations. The electronic control unit calculates a correction value based on a lowest rotation speed among the rotation speeds of the wheels under a predetermined condition. The electronic control unit performs correction by using the correction value to make the vehicle body speed closer to a vehicle body speed conversion value of the lowest rotation speed.
    Type: Application
    Filed: October 15, 2020
    Publication date: April 29, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Hui ZHENG, Wataru HIRATA, Tetsuya YAMAZAKI
  • Patent number: 10988169
    Abstract: A steering device includes a steering wheel, a torsion bar, a spiral cable, a torque sensor, and an electronic control unit. The electronic control unit is configured to compute a rotational angle of the steering wheel. The electronic control unit is configured to compute, as driver torque, a value that includes a sum obtained by adding torsion bar torque, a steering wheel inertial torque compensation value and a spiral cable torque compensation value. The steering wheel inertial torque compensation value is the product of a steering wheel inertial moment and a second-order differential value of the rotational angle of the steering wheel. The spiral cable torque is torque that acts on the steering wheel because of the spiral cable.
    Type: Grant
    Filed: September 30, 2019
    Date of Patent: April 27, 2021
    Assignee: JTEKT CORPORATION
    Inventors: Maxime Moreillon, Tsutomu Tamura, Robert Fuchs
  • Publication number: 20210115968
    Abstract: A rolling bearing includes an inner ring, an outer ring, and a plurality of balls interposed between the inner ring and the outer ring. The inner ring and the outer ring are made of stainless steel. A raceway surface with which the ball is in rolling-contact in each of the inner ring and the outer ring and is a superfinished surface and a coating layer made of a solid lubricating film is formed on the superfinished surface.
    Type: Application
    Filed: June 6, 2018
    Publication date: April 22, 2021
    Applicant: JTEKT CORPORATION
    Inventor: Kazuhiro KIMURA
  • Patent number: 10981596
    Abstract: A control steered angle calculation unit includes: an end position determination unit that determines whether a rack shaft is located at either one of right and left rack end positions; a motor absolute angle calculation unit that detects a motor absolute angle; an end position-corresponding motor angle setting unit that, when the rack shaft is determined to be located at either one of the right and left rack end positions, sets the detected motor absolute angle as an end position-corresponding motor angle corresponding to the one of the right and left rack end positions; and a control steered angle origin setting unit that calculates an average value of right and left end position-corresponding motor angles as an offset angle, and sets an angle obtained by subtracting the offset angle from the detected motor absolute angle as an origin of the control steered angle represented by the motor ab solute angle.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: April 20, 2021
    Assignee: JTEKT CORPORATION
    Inventors: Nobuaki Kataoka, Shingo Maeda, Jun Hasegawa, Masayuki Kita, Takahiro Toko
  • Patent number: 10981598
    Abstract: A control apparatus calculates an axial force deviation, which is a difference between an ideal axial force and an estimated axial force. The ideal axial force is based on a target pinion angle of a pinion shaft configured to rotate in association with a turning operation of steered wheels. The estimated axial force is based on a state variable (such as a current value of a steering operation motor) that reflects vehicle behavior or a road condition. The control apparatus changes a command value for a reaction motor in response to the axial force deviation. For example, the control apparatus includes a basic control circuit configured to calculate a basic control amount, which is a fundamental component of the command value. The basic control circuit changes the basic control amount in response to the axial force deviation. The command value based on the basic control amount reflects the road condition.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: April 20, 2021
    Assignee: JTEKT CORPORATION
    Inventor: Takashi Kodera
  • Publication number: 20210107443
    Abstract: A vehicle drive device includes a control device, and the control device controls an electric motor, a first pressing mechanism and a second pressing mechanism such that a relational expression of T<T1+T2 is satisfied, where T represents a torque that is input to an input rotation member, T1 represents a maximum of a torque that is able to be transmitted by a first multi-disc clutch and T2 represents a maximum of a torque that is able to be transmitted by a second multi-disc clutch.
    Type: Application
    Filed: September 30, 2020
    Publication date: April 15, 2021
    Applicant: JTEKT CORPORATION
    Inventors: Toshihiko YAMAMOTO, Tetsuya YAMAZAKI, Wataru HIRATA, Shotaro NIIMI, Tomoaki KATO