Patents Assigned to JTEKT
  • Publication number: 20230219618
    Abstract: A steer-by-wire steering system including a steering device including a steering motor and a controller configured to supply a steering current to the steering motor based on a steering request. The controller includes a plurality of microcomputers, a plurality of drive circuits, and a plurality of temperature sensors. When a detection temperature difference that is a difference between detection temperatures of any two of the plurality of temperature sensors is greater than a predetermined threshold, each of the plurality of microcomputers executes an independent calculation control to independently calculate and set a current limit value, which is an upper limit value of the steering current, based on a detection temperature of one of the plurality of temperature sensors corresponding to itself, irrespective of detection temperatures of one or more of the plurality of temperature sensors other than the one of the plurality of temperature sensors corresponding to itself.
    Type: Application
    Filed: December 16, 2022
    Publication date: July 13, 2023
    Applicants: Toyota Jidosha Kabushiki Kaisha, JTEKT CORPORATION, DENSO CORPORATION
    Inventors: Takahito ISHINO, Masaharu YAMASHITA, Kenji SHIBATA, Yosuke YAMASHITA, Shintaro TAKAYAMA, Kazuaki IIDA, Ryo YAMAZAKI, Yuuta KAJISAWA, Kenichi ABE, Toyohiro HAYASHI, Nobuyori NAKAJIMA, Hiroyasu OTAKE, Kurumi TAZUKE, Hiroki TOMIZAWA
  • Patent number: 11698141
    Abstract: A pressure reducing valve includes: a body, a valve seat, and a valve element opening and closing the valve seat according to a difference between a pressure on the inlet side and a pressure on the outlet side. A pressure chamber, which is a space part between the valve element and the valve seat, is provided on the inlet side of the valve element. The valve element includes a plurality of horizontal holes each opening to the pressure chamber, and a vertical hole bringing the horizontal holes and the outlet side of the valve element into communication with each other. The horizontal holes and the vertical hole are provided in such a manner that a value of a ratio of a flow channel area of the vertical hole to a total area that is a total of flow channel areas of the horizontal holes exceeds 1.16.
    Type: Grant
    Filed: November 29, 2021
    Date of Patent: July 11, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Kazushi Numazaki, Tetsuya Kaneko, Akira Nakano, Kazuhiro Takabayashi, Kazuo Haneda, Yuya Kihara
  • Publication number: 20230212474
    Abstract: There is provided a grease composition for improving the chemical stability of the grease composition and increasing the fatigue life of a member in which the grease composition is used. The problems can be solved by a grease composition including a poly-?-olefin; a urea-based thickener; molybdenum dithiophosphate; and barium sulfonate, wherein a difference between an SP value of the urea-based thickener and an SP value of the poly-?-olefin is 3.5 or less.
    Type: Application
    Filed: April 7, 2021
    Publication date: July 6, 2023
    Applicants: JTEKT CORPORATION, ENEOS Corporation
    Inventors: Koji YOSHIZAKI, Kazunori MIYAKE, Kazumi SAKAI, Yusuke AYAME, Kiyomi SAKAMOTO
  • Patent number: 11691663
    Abstract: A steering control device controls a steering device that includes an electric motor. The steering control device includes a control unit configured to control an operation of the steering device by controlling the electric motor. The control unit is configured to calculate a control value for controlling the electric motor, to calculate a predetermined component indicating characteristics of the steering device using a value of a variable associated with the control value as an input, and to determine whether a mechanical abnormality has occurred in the steering device based on the calculated predetermined component.
    Type: Grant
    Filed: March 1, 2021
    Date of Patent: July 4, 2023
    Assignee: JTEKT CORPORATION
    Inventor: Takashi Kodera
  • Patent number: 11691667
    Abstract: A steering device includes two motors each configured to generate a drive force that steers a steerable wheel of a vehicle and two controllers respectively corresponding to the two motors, each of the two controllers being configured to individually control a corresponding one of the motors. One of the two controllers is a first controller, and the other one of the two controllers is a second controller. The first controller is configured to calculate a command value corresponding to a total torque that should be generated in the two motors. The command value is divided into individual command values using a changeable distribution ratio set for each of the motors, the individual command values respectively corresponding to the motors. The two controllers are configured to respectively supply the motors with current corresponding to the individual command values.
    Type: Grant
    Filed: August 19, 2020
    Date of Patent: July 4, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Yoshio Kondo, Toshiaki Ogata, Fumio Kishida, Keishi Nakamura, Hirohide Suzuki
  • Patent number: 11691664
    Abstract: A vehicle steering device includes an electric motor applying a steering force to a vehicle turning mechanism, a first setting portion setting a target assist torque in accordance with a steering torque, a second setting portion setting an angle controlling target torque for bringing an angular deviation between a target steering angle and an actual steering angle close to zero, a restriction processing portion restricting the angle controlling target torque set by the second setting portion, a first calculating portion calculating a target automatic steering torque using the angle controlling target torque after the restriction process by the restriction processing portion, and second calculating portions performing weighted addition of the target automatic steering torque and the target assist torque in accordance with a value that changes in accordance with a driver input to calculate a target motor torque that is a electric motor target motor torque value.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: July 4, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Maxime Moreillon, Tsutomu Tamura, Robert Fuchs, Tomohiro Nakade
  • Patent number: 11685430
    Abstract: A motor controlling ECU 202 includes an automatic steering controller 42 that sets an automatic steering control amount, an assist controller 41 that sets an assist control amount, an integrated control amount calculating portion 43 that calculates an integrated control amount by adding the automatic steering control amount and the assist control amount, and an actual automatic steering angle calculating portion 46 that calculates, based on at least one of either of a steering torque and the assist control amount, an actual automatic steering angle that is a steering angle due to automatic steering control and included in an actual steering angle. The automatic steering controller 42 uses a target automatic steering angle and the actual automatic steering angle to set the automatic steering control amount.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: June 27, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Mitsuko Yoshida, Naoki Shoji, Robert Fuchs
  • Patent number: 11685429
    Abstract: A steering control device includes: an absolute steering angle detecting unit configured to detect an absolute steering angle; and a current command value calculating unit configured to calculate a current command value corresponding to a target value of the motor torque output from the motor. The current command value calculating unit is configured to perform partial release control for decreasing a correction value of the current command value due to execution of the end contact relaxation control when a vehicle is tried to be turned at the time of execution of the end contact relaxation control. The current command value calculating unit is configured to stop the partial release control when the current command value which is calculated at the time of execution of the partial release control is a value which is not affected by decreasing the correction value based on execution of the partial release control.
    Type: Grant
    Filed: January 25, 2021
    Date of Patent: June 27, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Takafumi Yamaguchi, Takahiro Toko, Nobuaki Kataoka, Yukinobu Ezaki
  • Patent number: 11685428
    Abstract: A steering control device includes a control circuit and a drive circuit. The control circuit is configured to perform a current feedback computation by which the actual current value of electric current to be supplied to a motor follows a current command value. The control circuit is configured to execute an end-abutting relaxation control to correct the current command value such that decrease in an end interval angle is restricted, when the end interval angle is equal to or smaller than a predetermined angle, the end interval angle indicating the distance of the absolute steer angle from the end position correspondence angle. The control circuit is configured to adjust a control gain to be used in the current feedback computation, such that the control gain increases, when overshoot of the actual current value occurs during the execution of the end-abutting relaxation control.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: June 27, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Nobuaki Kataoka, Takahiro Toko, Takafumi Yamaguchi, Yukinobu Ezaki
  • Publication number: 20230192179
    Abstract: Reducer device having electric power steering, including a support member, an endless screw, a toothed wheel that meshes with a helical spline arranged on the endless screw, the endless screw including a first end capable of being rotated, and a second end receiving a first rotation-guiding means and a second rotation-guiding means, respectively, causing the endless screw to pivot relative to the support member, the second rotation-guiding means including a damping sleeve and a rotation-guiding device, the sleeve surrounding the rotation-guiding device, the second rotation-guiding means including a centering means including a press-fitting part inserted into the rotation-guiding device, and an attachment part rigidly connected to the support member.
    Type: Application
    Filed: May 11, 2021
    Publication date: June 22, 2023
    Applicant: JTEKT EUROPE
    Inventor: Sylvain GROSSO
  • Patent number: 11680871
    Abstract: A rolling bearing test includes: a hermetic container configured to allow atmosphere gas to be introduced therein; a rotary shaft housed in the hermetic container and fitted into the rolling bearing; a pair of shaft support portions fixed to a fixing portion provided in the hermetic container and configured to rotatably support the rotary shaft at both sides of the rolling bearing in an axial direction, respectively; a drive device configured to drive the rotary shaft; a holding portion configured to hold the outer ring of the rolling bearing to avoid rotation of the outer ring; a first load application mechanism configured to apply an axial load between the inner ring and the outer ring of the rolling bearing; and a second load application mechanism.
    Type: Grant
    Filed: June 8, 2020
    Date of Patent: June 20, 2023
    Assignees: JTEKT CORPORATION, KANDA CO. LTD
    Inventors: Satoshi Fujimaru, Yousuke Nagano, Yuzuru Takahashi, Nobuhiro Kanda, Syuichi Miyabe
  • Patent number: 11679801
    Abstract: A steering device includes a steering rod that includes two ball screw parts, the steering rod being configured to steer a steerable wheel by moving linearly, two ball nuts respectively fastened to the two ball screw parts, two motors each configured to generate a drive force, two transmission mechanisms each including a toothed belt, the two transmission mechanisms being configured to transmit the drive force of each one of the two motors to a corresponding one of the ball nuts, two detectors configured to respectively detect rotation angles of the two motors, and a controller configured to control each of the two motors. The controller is configured to detect tooth jumping of the belts using the rotation angles of the two motors that are detected by the two detectors.
    Type: Grant
    Filed: August 19, 2020
    Date of Patent: June 20, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Yoshio Kondo, Toshiaki Ogata, Fumio Kishida, Keishi Nakamura, Hirohide Suzuki
  • Patent number: 11679799
    Abstract: A method includes a rotation locking step during which the rotation of the threaded hub about the central axis is blocked by heating a portion of the plug to soften, then by forcing the softened thermoplastic material to penetrate into, and then solidify in, a female cavity hollowed in the wall of the orifice to constitute a male member which fits into the female cavity. The female cavity forms, against the action of the male member, a guiding end stop preventing the male member, and therefore the hub, from rotating about the central axis to oppose any rotary screwing/unscrewing of the plug and maintaining a degree of freedom in axial translation along the central axis of the male member within the female cavity, so as not to impede a sliding of the hub and of its screw thread along the central axis against the wall.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: June 20, 2023
    Assignee: JTEKT EUROPE
    Inventors: Pascal Vizier, Bruno Goujon
  • Patent number: 11679802
    Abstract: A steering control device includes an electronic control unit. The electronic control unit detects an absolute steering angle. The electronic control unit controls driving of a motor. The electronic control unit determines whether movement of a turning shaft to one of right and left sides has been limited by an end contact or execution of end contact relaxation control. The electronic control unit acquires a plurality of limit position determination angles corresponding to the absolute steering angle. The electronic control unit permits update of an end-position-corresponding angle. The electronic control unit updates the end-position-corresponding angle stored in the electronic control unit.
    Type: Grant
    Filed: September 24, 2020
    Date of Patent: June 20, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Takafumi Yamaguchi, Takahiro Toko, Nobuaki Kataoka, Yukinobu Ezaki
  • Publication number: 20230184297
    Abstract: A constant-speed universal joint includes: an outer ring; an inner ring; a plurality of balls that engages with the outer-ring ball grooves and the inner-ring ball grooves; and a holder that is interposed between an inner spherical surface of the outer ring and an outer spherical surface of the inner ring and in which a holding window for holding the plurality of balls is formed. A chamfered portion is formed in the inner ring. The chamfered portion includes a linear section portion that is formed in a linear shape in a section perpendicular to a moving locus of the center of the corresponding ball and an arc section portion that is formed in a protruding arc shape in the section perpendicular to the moving locus of the center of the corresponding ball.
    Type: Application
    Filed: December 8, 2022
    Publication date: June 15, 2023
    Applicant: JTEKT CORPORATION
    Inventors: Koji KUBO, Yuya KUDO, Masahito IKEO, Yoshitaka SHINODA, Susumu ABE
  • Patent number: 11674551
    Abstract: A lubricant supply device includes a porous body including a first porous portion and a second porous portion in contact with the first porous portion, the porous body being impregnated with a lubricant. A penetration depth of the lubricant in the second porous portion is larger than a penetration depth of the lubricant in the first porous portion.
    Type: Grant
    Filed: December 30, 2021
    Date of Patent: June 13, 2023
    Assignee: JTEKT CORPORATION
    Inventor: Toru Kamiya
  • Patent number: 11670164
    Abstract: A crosswind effect estimation device is mounted in a vehicle and configured to estimate an effect on the vehicle due to a crosswind. The crosswind effect estimation device includes a processor configured to i) acquire information on the crosswind in a predetermined region forward of the vehicle in a traveling direction of the vehicle, ii) acquire information on a shielding object that is located on a windward side in a direction of the crosswind, and iii) estimate the effect on the vehicle due to the crosswind based on the acquired information on the crosswind and the acquired information on the shielding object.
    Type: Grant
    Filed: June 8, 2020
    Date of Patent: June 6, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Kyouhei Takamori, Hiroto Takaue
  • Patent number: 11661106
    Abstract: A steering system includes a rotary shaft to which an operation member is coupled; a first actuator; a second actuator; a control unit; and a moving unit configured to move the operation member between a normal position and a storage area. The control unit is configured to switch between a manual drive mode and an autonomous drive mode. The control unit is configured to, when moving the operation member from the storage area to the normal position, start synchronous control when the operation member satisfies a predetermined condition before the operation member reaches the normal position, the synchronous control being control in which the control unit controls the first actuator to change a rotation angle of the rotary shaft to an angle corresponding to a steered angle of steered wheels driven by the second actuator.
    Type: Grant
    Filed: January 11, 2021
    Date of Patent: May 30, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Takeshi Watanabe, Yasuyuki Nozawa
  • Patent number: 11662706
    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: Grant
    Filed: October 20, 2020
    Date of Patent: May 30, 2023
    Assignee: JTEKT CORPORATION
    Inventors: Natsuki Yabune, Toshihiro Yonezu, Koichi Kato, Yuki Ishigure
  • Patent number: 11661103
    Abstract: A steering control device for a steering system includes an electronic control unit configured to: calculate target torque that is a target value of the motor torque; control operation of the motor; calculate a vehicle speed basic axial force based on a detected vehicle speed; calculate another state quantity basic axial force based on a state quantity other than the detected vehicle speed; calculate a distributed axial force by adding the vehicle speed basic axial force and the other state quantity basic axial force at individually set distribution ratios; calculate the target torque based on the distributed axial force; and reduce the distribution ratio of the vehicle speed basic axial force when the detected vehicle speed is abnormal as compared to when the detected vehicle speed is normal.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: May 30, 2023
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takashi Kodera, Isao Namikawa, Yusuke Kakimoto, Yoshio Kudo