Patents Assigned to JTEKT
  • Grease composition, and rolling bearing
    Patent number: 12037561
    Abstract: A grease composition including: a base oil; a thickener; a zinc sulfonate; a polysulfide; an overbased calcium sulfonate; and triphenyl phosphite, in which a proportion of the zinc sulfonate with respect to a total mass of the base oil and the thickener is 0.030 mass % to 0.045 mass % in terms of a zinc content, a proportion of the polysulfide with respect to the total mass of the base oil and the thickener is 0.16 mass % to 0.24 mass % in terms of a sulfur content, a proportion of the overbased calcium sulfonate with respect to the total mass of the base oil and the thickener is 0.010 mass % to 0.015 mass % in terms of a calcium content, and a proportion of the triphenyl phosphite with respect to the total mass of the base oil and the thickener is 0.24 mass % to 0.36 mass %.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: July 16, 2024
    Assignees: JTEKT CORPORATION, ENEOS CORPORATION
    Inventors: Takeshi Tsuda, Yurie Hagino, Kazumi Sakai, Yusuke Ayame, Go Tatsumi, Kiyomi Sakamoto
  • Steering control device
    Patent number: 12037059
    Abstract: In a steering control device, a plurality of control systems is configured to switch a drive mode to a cooperative drive mode when command values calculated by control units of the control systems are not different from each other and to switch the drive mode to an independent drive mode when the command values calculated by the control units of the control systems are different from each other. The control systems are configured to gradually limit the command values respectively calculated by the control units of the control systems when a start switch of a vehicle has been turned off. The control systems are configured to switch the drive mode to the independent drive mode regardless of whether the command values calculated by the control units of the control systems are different from each other when the start switch has been turned off while the vehicle is traveling.
    Type: Grant
    Filed: March 10, 2022
    Date of Patent: July 16, 2024
    Assignees: JTEKT CORPORATION, DENSO CORPORATION
    Inventors: Satoshi Sugiyama, Koichi Nakamura
  • Steering control device
    Patent number: 12037055
    Abstract: A steering control device includes an electronic control unit. The electronic control unit is configured to calculate a target rotation angle of a shaft rotating with a turning operation of turning wheels based on a steering angle of a steering wheel acquired from a rotation angle of a reaction motor, to calculate a command value based on the target rotation angle and a steering torque acquired from a torsion angle of a torsion bar twisting with an operation of the steering wheel, and to compensate for the torsion angle by adding the torsion angle as a compensation value to the steering angle. The electronic control unit is configured to change a value of the torsion angle that is added to the steering angle according to a degree of change of a state variable used to calculate the command value.
    Type: Grant
    Filed: April 26, 2022
    Date of Patent: July 16, 2024
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroto Suzuki, Isao Namikawa, Yoshio Kudo, Yuki Suehiro, Kosuke Akatsuka
  • ELECTRIC MOTOR ASSEMBLY
    Publication number: 20240227917
    Abstract: A motor assembly including a casing of which at least a part extends along a longitudinal axis of the casing, a stator fixedly mounted in the casing, a rotor movably mounted in rotation in the casing, the rotor including a drive shaft configured to be guided in rotation about an axis of rotation of the drive shaft, a first guide bearing configured to guide in rotation the drive shaft about the axis of rotation of the drive shaft, the motor assembly being characterized in that it includes further a guide bearing support configured to couple with the casing and to support the first guide bearing, the guide bearing support and the casing being further configured such that a coupling of the guide bearing support and of the casing makes it possible to exert an adjustable axial preload on the first guide bearing.
    Type: Application
    Filed: October 20, 2023
    Publication date: July 11, 2024
    Applicant: JTEKT EUROPE
    Inventor: Patrice BROCHOT
  • VEHICLE POWER SUPPLY SYSTEM AND CONTROL METHOD OF VEHICLE POWER SUPPLY SYSTEM
    Publication number: 20240227923
    Abstract: A vehicle power supply system includes a power source control device that executes a process of switching a connection state of a driving circuit to the main power source and an auxiliary power source including; a process of switching the connection state so as to transition to a backup state as a voltage decrease of the main power source occurs, and a process of switching the connection state so as to transition to a normal state as the voltage decrease of the main power source is resolved. After a voltage decrease of the main power source occurs, a turning-side control device of a steering control unit sets an output-limited state for a turning-side motor. The output-limited state is canceled upon the power source control device completing switching of the connection state so as to transition.
    Type: Application
    Filed: October 12, 2023
    Publication date: July 11, 2024
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
    Inventors: Yuuta KAJISAWA, Yuji FUJITA, Yugo NAGASHIMA, Kazuma HASEGAWA, Takashi KOUDAI, Kaishi MONOBE, Kenichi ABE, Masaharu YAMASHITA, Shintaro TAKAYAMA, Kazuaki IIDA, Yasushi HORA, Yosuke YAMASHITA, Hiroki TOMIZAWA, Nobuyori NAKAJIMA, Hayaki TANABE, Toyohiro HAYASHI, Takeshi IWANA
  • Steering control device and steering system
    Patent number: 12030560
    Abstract: A steering control device includes a target torque generator configured to generate a target torque which is a target value of the motor torque and a control signal generator configured to generate a control signal for controlling the motor such that the motor torque corresponding to the target torque is generated. The target torque generator includes a pre-adjustment axial force calculator, a first axial force calculator, a second axial force calculator, a post-adjustment axial force calculator, and a target torque calculator. The post-adjustment axial force calculator is configured to set a proportion of a first axial force contributing to a post-adjustment axial force to be smaller when a state of a vehicle speed is abnormal than when the state of the vehicle speed is normal.
    Type: Grant
    Filed: September 24, 2021
    Date of Patent: July 9, 2024
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Kakimoto, Takashi Kodera, Yoshio Kudo
  • Steering system
    Patent number: 12030559
    Abstract: A steering system includes a steering shaft that rotates along with an operation of a steering wheel; a motor configured to generate a torque that is applied to the steering shaft; and a control unit configured to control the motor. The control unit is configured to control the motor such that a rotation speed of the steering wheel decreases gradually to zero when automatic rotation of the steering wheel is stopped, in a case where the steering wheel is automatically rotated as an adjustment process of adjusting a rotational position of the steering wheel.
    Type: Grant
    Filed: June 14, 2021
    Date of Patent: July 9, 2024
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yusuke Kakimoto, Yoshiyuki Uchino, Kenji Shibata, Takafumi Sato
  • ASSIST DEVICE
    Publication number: 20240217093
    Abstract: An assist device includes: a first wearing tool mounted to at least a waist portion of a user, an assist arm disposed along a thigh portion of the user and being turnable with respect to the first wearing tool; a motor that generates torque for turning the assist arm; a second wearing tool provided on the assist arm and mounted to the thigh portion; an acceleration sensor provided on the first wearing tool; a rotation detector that detects a turning state of the assist arm; and a control device that controls the motor. The control device includes a processing portion that executes an estimation process of obtaining an estimated weight of a load to be lifted by the user based on an output of the acceleration sensor and an output of the rotation detector, and a control process of controlling the motor based on the estimated weight.
    Type: Application
    Filed: December 27, 2021
    Publication date: July 4, 2024
    Applicant: JTEKT CORPORATION
    Inventors: Yoshinobu KATO, Genki MURATA, Ai HIGUCHI, Atsushi ANDO
  • GEAR MANUFACTURING APPARATUS, GEAR MANUFACTURING METHOD, AND THREADED TOOL FOR USE IN THE APPARATUS AND THE METHOD
    Publication number: 20240217011
    Abstract: A gear manufacturing apparatus configured to grind a gear workpiece including teeth formed on its outer circumferential surface, by meshing and rotating the gear workpiece and a threaded tool including one or more spiral processing teeth formed on an outer circumferential surface of a base portion of the tool, including: a control device configured to execute a corner portion grinding control in which one corner portion among four corners of each tooth surface of the gear workpiece is ground such that a termination, which is an edge of the processing tooth in a tooth trace direction, comes into contact with the gear workpiece, utilizing only a termination tooth surface in a one-side tooth surface of the processing tooth or the other-side tooth surface of the processing tooth, the termination tooth surface being set to include part of the termination and being one closed region.
    Type: Application
    Filed: December 28, 2021
    Publication date: July 4, 2024
    Applicant: JTEKT GEAR SYSTEMS CORPORATION
    Inventors: Kousuke FUNAHASHI, Kenichi MARUYAMA, Norihiko KONDO
  • Control device for vehicle
    Patent number: 12024174
    Abstract: A control device includes control circuits of a plurality of systems. When a transition condition is established, the control circuits of the systems make transition of a driving mode from a first driving mode to a second driving mode, and when a return condition is established in a state in which the driving mode has transitioned to the second driving mode, the control circuits of the systems make transition of the driving mode from the second driving mode to the first driving mode while gradually changing the current command values of the control circuits' own systems toward the current command values before the adjustment.
    Type: Grant
    Filed: October 24, 2022
    Date of Patent: July 2, 2024
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
    Inventors: Kazuma Hasegawa, Yuji Fujita, Takashi Kodera, Isao Namikawa, Atsushi Ishihara, Masaharu Yamashita, Kenji Shibata, Yuko Goto, Hiroki Tomizawa, Nobuyori Nakajima
  • STEERING CONTROL DEVICE
    Publication number: 20240208565
    Abstract: A steering control device includes a processor. The processor is configured to execute a process in a state where dynamic force transmission between a steering wheel and a turning wheel is not performed. The process includes: a process of controlling a reaction force that is given to the steering wheel, by operating torque of the reaction force motor depending on the value of a reaction force command variable; a process of reflecting a predetermined component of a frequency signal that is given to the turning wheel in the value of the reaction force command variable; and a process of restricting the degree of contribution of the predetermined component to the value of the reaction force command variable, to a smaller degree, in a situation where a steering system including the steering wheel is unstable.
    Type: Application
    Filed: December 18, 2023
    Publication date: June 27, 2024
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuto NAKAGAWA, Terutaka TAMAIZUMI, Yuki INDEN, Saki TAKAHASHI
  • Weighting of an assistance function application in an assisted steering system of a vehicle
    Patent number: 12012158
    Abstract: A method for modulating an assistance function application of an assisted steering system in a vehicle, the vehicle including at least two wheels, a steering wheel and an assistance motor applying an assistance torque on a rack, the method implementing a step of evaluating an application gain of the assistance function, a step of estimating the assistance torque associated with the assistance function and a step of multiplying the assistance torque associated with the assistance function and the application gain, characterised in that the step of evaluating the application gain includes a first phase of determining a first gain depending on a yaw speed and an angle of the steering wheel.
    Type: Grant
    Filed: July 9, 2019
    Date of Patent: June 18, 2024
    Assignee: JTEKT EUROPE
    Inventors: André Michelis, Luc Leydier
  • Steering column device
    Patent number: 12005954
    Abstract: A steering column device includes: a link mechanism pivotably supported with respect to a fixing bracket about a first pivot shaft, which is perpendicular to a center axis PC of a steering shaft and is positioned further toward an upper side of a vehicle than the center axis PC, and pivotably supported with respect to a column jacket about a second pivot shaft, which is positioned further toward the upper side of the vehicle than the center axis PC; and a drive mechanism connected to the link mechanism to drive the link mechanism, thereby adjusting a tilt angle of the steering shaft. A sliding member includes a shaft member engaged in an elongated hole which is provided in a portion of the link mechanism which is near the second pivot shaft, and the shaft member is pivotably supported in the elongated hole and fixed to the column jacket.
    Type: Grant
    Filed: May 21, 2021
    Date of Patent: June 11, 2024
    Assignee: JTEKT COLUMN SYSTEMS CORPORATION
    Inventors: Daisuke Terada, Takeshi Miyagi
  • Machining assist system and cutting apparatus
    Patent number: 12007756
    Abstract: A machining assist system includes a knowledge database, a receiver, a control unit, and a display. The knowledge database stores various pieces of information indicative of know-how concerning a machining method and a machining facility. The receiver receives a question. The control unit executes a driving solver and a solution-providing solver so as to search the knowledge database using a search condition based on the question and derive a response. The display presents the response. The response includes a plurality of measures, priorities assigned to the measures, and progress information indicative of a search process and a search route. The search process includes a plurality of factors to be used to derive the measures. The search route is a link between the factors. The search process and the search route are visually presented on the display.
    Type: Grant
    Filed: September 24, 2019
    Date of Patent: June 11, 2024
    Assignee: JTEKT Corporation
    Inventors: Hiroshi Kojima, Yoshihiko Yamada, Takayuki Azuma, Toshiki Sakai, Shigetoshi Noritake, Kazunari Teramoto
  • THRUST BEARING
    Publication number: 20240183404
    Abstract: A thrust bearing that can improve the effect of preventing entry of muddy water etc. The thrust bearing includes: an annular first bearing ring; an annular second bearing ring facing the first bearing ring in an axial direction; a plurality of rolling elements rollably arranged between the first bearing ring and the second bearing ring; an outer seal provided on the second bearing ring, located radially outward of the rolling elements, and sealing a space between the first bearing ring and the second bearing ring; and a cover covering the outer seal from outside in a radial direction.
    Type: Application
    Filed: May 7, 2021
    Publication date: June 6, 2024
    Applicants: JTEKT CORPORATION, NAKANISHI METAL WORKS CO., LTD.
    Inventors: Hiroshi YANO, Mitsuru SAITO, Kohei SHIBATA
  • Method for estimating and adjusting friction to be adjusted, and controlling hysteresis of a steering wheel torque, and corresponding power steering system
    Patent number: 11993327
    Abstract: Method for determining a friction to be adjusted in a power steering system or for modifying a hysteresis of a steering wheel torque applied to a steering wheel of the power steering system, the method including the following steps of: determining a speed, from a measurement of a speed of a part of the power steering system and/or a measurement of the steering wheel torque; determining the friction to be adjusted on the basis of a modified LuGre model, said modified LuGre model determining the friction to be adjusted as a function of a state of the system, a time derivative of the state being determined as a function of said state of the system, the speed, a first gain, and a coulomb friction, according to an equation of the form: z . = v ? ( 1 - ? ? ( z , v ) ? ? 0 ? z F c ? sign ? ( v ) ) .
    Type: Grant
    Filed: March 8, 2022
    Date of Patent: May 28, 2024
    Assignee: JTEKT EUROPE
    Inventors: Nicolas Baudouin, Pierre Larminy
  • Motor control device and steering system having the same
    Patent number: 11987298
    Abstract: A main power supply having a large capacity and a backup power supply having a small capacity are switchable by a power supply switching determination unit in a system. A motor control device drives a motor by the main power supply or the backup power supply. A drive control unit outputs a drive signal, calculated by feedback control of the current detection value with respect to the current command value, to an inverter circuit. When the power supply switching determination unit switches from the main power supply to the backup power supply, the drive control unit moves from a normal control using the main power supply to a backup control that restricts an electric power consumption and prevents the backup power supply from stopping.
    Type: Grant
    Filed: April 1, 2022
    Date of Patent: May 21, 2024
    Assignees: DENSO CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, JTEKT CORPORATION
    Inventors: Takuya Maegawa, Hiroki Tomizawa, Hiroyasu Otake, Yuuta Kajisawa, Yuji Fujita, Tokuaki Hibino, Yosuke Yamashita, Atsushi Satou, Masaharu Yamashita
  • STEERING CONTROL DEVICE
    Publication number: 20240158003
    Abstract: A steering control device includes a processor. The processor is configured to execute a target rudder angle correction process, a restriction process, and a rudder angle control process. The target rudder angle correction process is a process of correcting the value of the target rudder angle variable by a play compensation amount corresponding to a steering direction. The restriction process is a process of restricting the magnitude of the play compensation amount to a small side depending on the traveling route at a current position of the vehicle and the traveling route at a movement-directional forward position. The rudder angle control process is a process of operating the motor by a control in which a steering angle is adopted as a control amount and the value of the target rudder angle variable is adopted as a target value of the control amount.
    Type: Application
    Filed: November 14, 2023
    Publication date: May 16, 2024
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kotaro OKADA, Kazuki Itazuri
  • Wheelchair
    Patent number: D1027741
    Type: Grant
    Filed: April 27, 2022
    Date of Patent: May 21, 2024
    Assignee: JTEKT CORPORATION
    Inventors: Hiroshi Kitamoto, Akihiro Takeuchi, Riku Nagayama, Chishin Yohena, Toshiki Kumeno, Nobuaki Ikehara, Nobuyuki Togashi, Goro Tsuji, Toshihiro Ishikawa
  • Wheelchair
    Patent number: D1027742
    Type: Grant
    Filed: April 27, 2022
    Date of Patent: May 21, 2024
    Assignee: JTEKT CORPORATION
    Inventors: Hiroshi Kitamoto, Akihiro Takeuchi, Riku Nagayama, Chishin Yohena, Toshiki Kumeno, Nobuaki Ikehara, Nobuyuki Togashi, Goro Tsuji, Toshihiro Ishikawa