Patents Assigned to JTEKT
  • Steering control device
    Patent number: 10246125
    Abstract: There is provided a steering control device that can control even when a systematic error has occurred. An update amount calculation processing circuit manipulates a control angle in accordance with an update amount in order to control steering torque, which is obtained by subjecting the magnitude of steering torque to a decrease correction by a threshold, to target torque through feedback control. The control angle is used to convert a current command value to a value in a fixed coordinate system or the like. The update amount is subjected to a guarding process in accordance with the steering torque by a torque-based guarding processing circuit, and determined as a final update amount for the control angle. The torque-based guarding processing circuit performs the guarding process on the update amount such that the update amount is in an allowable range that matches the steering torque.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: April 2, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Hidenori Itamoto, Naoki Yamano
  • Ball screw mechanism and steering system
    Patent number: 10246122
    Abstract: A ball screw mechanism that allows a reduction in contact and friction between a retainer and a nut is provided. In a ball screw mechanism, a nut is threadedly engaged with a screw groove of a rack shaft through balls retained in a retainer groove of a retainer, and an axial force is applied to the rack shaft in accordance with rotation of the nut. The nut includes a uniform diameter portion having a uniform inside diameter and enlarged diameter portions each having an inside diameter larger than that of the uniform diameter portion. The enlarged diameter portions are provided at opposite axial ends of a region on an inner circumferential surface of the nut. The region faces the retainer groove and retainer ends adjoining to opposite axial ends of the retainer groove.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: April 2, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Toshihiro Asakura, Takuya Nakayama, Keisuke Ogawa
  • Facility system
    Patent number: 10250413
    Abstract: In a facility system, a first gateway PLC connected to first processing machines and second gateway PLCs connected to second processing machines are connected to an upper-level network. Further, the first gateway PLC and the second gateway PLCs control operation mutually associated between the first processing machines and the second processing machines on the basis of mutually associated information which is acquired from the first processing machines and the second processing machines.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: April 2, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yoshinobu Shimizu, Toshio Aono
  • Rolling bearing device
    Patent number: 10247243
    Abstract: A rolling bearing device includes a bearing portion and an oil supply unit provided adjacent, in the axial direction, to an annular space between an inner ring and an outer ring of the bearing portion to supply lubricating oil to the annular space. The oil supply unit includes an oil chamber that accommodates lubricating oil, a nozzle that discharges lubricating oil in the oil chamber, a pump body that applies a discharge force for causing lubricating oil in the oil chamber to fly from the nozzle toward the annular space, and a detection portion that detects gathering of lubricating oil at a discharge port of the nozzle. The detection portion includes a pair of electrodes disposed with the discharge port of the nozzle interposed therebetween, and a measurement portion that measures the capacitance of the pair of electrodes.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: April 2, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Tsukasa Sakazaki, Yoshimichi Higashiyama, Masami Naka
  • Ball screw device
    Patent number: 10247286
    Abstract: A ball screw device includes a screw shaft, a nut, a ball train including a plurality of main balls, and a plurality of coil springs disposed in the ball train. The nut moves from a first axial side to a second axial side while an axial force is applied to the nut by rotation of the screw shaft. The plurality of coil springs are more densely arranged on the first axial side than on the second axial side in the ball train.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: April 2, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Akiyoshi Tashiro
  • Rolling bearing
    Patent number: 10247241
    Abstract: A rolling bearing includes a cage constructed by coupling a pair of split members that are split into halves in an axial direction of the rolling bearing. At least one of the split members has an engagement portion that protrudes in the axial direction toward the other one of the split members. The other one of the split members has an engagement groove that extends along the axial direction and houses the engagement portion. The engagement groove has an insertion port through which the engagement portion is inserted in the axial direction. The insertion port is formed at an end of the engagement groove that is closer to the one of the split members. At least one circumferential face of the engagement groove includes a first inclined surface that increases a circumferential width of the insertion port toward the one of the split members.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: April 2, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Youzou Taniguchi
  • VEHICLE CONTROL APPARATUS
    Publication number: 20190092383
    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: Application
    Filed: September 20, 2018
    Publication date: March 28, 2019
    Applicant: JTEKT CORPORATION
    Inventor: Takashi KODERA
  • VEHICLE CONTROL APPARATUS
    Publication number: 20190092384
    Abstract: A control apparatus calculates an axial force deviation, which is a difference between an estimated axial force and an ideal axial force based on a target pinion angle of a pinion shaft in association with a turning operation of steered wheels. The estimated axial force is based on a state variable that reflects vehicle behavior or a road condition. The control apparatus includes a steering angle ratio change control circuit configured to calculate a target pinion angle serving as a basis for calculation of the command value. The steering angle ratio change control circuit calculates a speed increasing ratio from a steering angle ratio set based on a vehicle speed and a base gear ratio of a steering mechanism, and calculates a correction angle for a target steering angle by multiplying the speed increasing ratio and the target steering angle together.
    Type: Application
    Filed: September 20, 2018
    Publication date: March 28, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Takashi KODERA, Masayuki KITA
  • ROLLING BEARING DEVICE
    Publication number: 20190093704
    Abstract: A rolling bearing device includes a bearing portion and a power generation portion. The power generation portion has a plurality of projecting portions provided on an outer ring spacer, a pair of core members provided on an inner ring spacer, a magnet, and a coil. The power generation portion generates an induced current in the coil as the projecting portions pass in the vicinity of first side end portions of the core members during rotation. There are two different loop paths along which magnetism generated by the magnet flows: a first loop path formed when the projecting portions are close to the first side end portions of the core members; and a second loop path formed when the projecting portions and the first side end portions of the core members are away from each other.
    Type: Application
    Filed: September 20, 2018
    Publication date: March 28, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Yoshimichi HIGASHIYAMA, Yusuke UEDA, Tsukasa SAKAZAKI
  • STEERING SYSTEM
    Publication number: 20190092379
    Abstract: Provided is a steering system including a low-cost rolling bearing with high supporting rigidity wherein generation of rattling noise during operation is prevented. A steering system includes a housing, a steered shaft, a ball screw device, a motor, a drive force transmission mechanism, and a bearing device. A ball nut portion is formed in a first range, and the bearing device supports a nut on the housing in a second range. The bearing device includes an outer ring, a first inner ring portion formed as a part of the nut in the second range, a second inner ring fitted to the outer peripheral surface of the nut in the second range, a plurality of bearing balls, and an enlarged diameter portion formed as a part of the nut in the second range.
    Type: Application
    Filed: September 14, 2018
    Publication date: March 28, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Yoshio KONDO, Manabu IGARASHI
  • Rotation angle detection device
    Patent number: 10243432
    Abstract: A rotation angle detection device detects a rotation angle of a motor having a shaft passing through a heat-dissipation plate. The rotation angle detection device includes: a permanent magnet attached to a base end of the shaft; a board that is disposed above the heat-dissipation plate and on which a drive circuit of the motor and a control circuit of the drive circuit are mounted; a magnetic sensor that is provided on the board so as to face the permanent magnet; and a magnetic shielding member that has a tubular shape and is disposed between the heat-dissipation plate and the board to surround the permanent magnet in plan view.
    Type: Grant
    Filed: May 18, 2016
    Date of Patent: March 26, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Takahito Hieda, Naoki Tani
  • Rolling bearing device and oil supply unit
    Patent number: 10240636
    Abstract: A rolling bearing device includes: a bearing portion that has an inner ring, an outer ring, a plurality of balls, and a cage that holds the plurality of balls; and an oil supply unit provided adjacent to the bearing portion in the axial direction and configured to supply lubricating oil to the bearing portion. The oil supply unit has: a pump that suctions lubricating oil into an oil chamber and discharges the lubricating oil by varying a capacity of the oil chamber by periodically driving a piezo element; and a control portion that causes the pump to operate by varying a rising time of a voltage applied to the piezo element in accordance with whether a drive period of the piezo element is long or short.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: March 26, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Tsukasa Sakazaki, Yoshimichi Higashiyama, Masami Naka
  • Sealing device
    Patent number: 10240674
    Abstract: A sealing device which allows the man-hour for mounting the sealing device to be reduced is provided. A sealing device includes: a slinger fitted and fixed to an end portion of an inner shaft; a core metal fitted and fixed to an end portion of an outer ring; an inner seal lip fixed to the core metal and in slidable contact with the slinger; an outer seal lip fixed to the core metal radially outward of the inner seal lip and in slidable contact with a side surface of a flange portion; and a labyrinth lip fixed to the core metal radially outward of the outer seal lip and forming a labyrinth seal together with the side surface of the flange portion.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: March 26, 2019
    Assignees: Koyo Sealing Techno Co., Ltd., JTEKT Corporation
    Inventors: Shintaro Sakai, Katsuyuki Sakaji, Yoshito Takada
  • Joint member for wind power generation apparatus, and wind power generation apparatus
    Patent number: 10233906
    Abstract: A joint member for a wind power generation apparatus includes: a first rotor integrally rotating with an output shaft of a speed increaser; a second rotor integrally rotating with an input shaft of a generator; and a one-way clutch provided between the first rotor and the second rotor. A torsion promoting portion being readily twisted and elastically deformed is provided at a portion of the first rotor where power is transmitted from the output shaft to the one-way clutch.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: March 19, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Hideki Fujiwara
  • Steering apparatus
    Patent number: 10232872
    Abstract: There is provided a steering apparatus including a fixing mechanism for fixing a driven pulley and a rolling nut to each other, the fixing mechanism configured to suppress at least one of deformation of external teeth of the driven pulley and an increase in size of a housing surrounding the driven pulley. A steering apparatus includes: a steered shaft; a ball screw mechanism including a rolling screw portion, a rolling nut, and rolling elements; a motor; a belt transmission mechanism including a drive pulley, a driven pulley, and a toothed belt; and a fixing mechanism. The fixing mechanism includes an internal thread, a cutout section, and a locknut. The cutout section is provided at a position offset, in the axial direction, from a range of second external teeth in the axial direction, and the locknut includes a locknut body, a locking lug, and a remaining portion.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: March 19, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Toshihiro Asakura, Takuya Nakayama
  • Sensor system
    Patent number: 10234349
    Abstract: Provided is a sensor system capable of more accurately detecting abnormality. A sensor IC includes a first detector, a second detector, and a communication circuit. The first detector and the second detector output a first digital value and a second digital value according to the strength of a magnetic flux applied thereto, respectively. The communication circuit transmits the first and second digital values received from the first and second detectors to a control device. At this time, the communication circuitplaces the first and second digital values in a plurality of frames to transmit the plurality of frames. The communication circuit forms the plurality of frames such that bit information data of the first and second digital values placed in the frames is arranged in different orders between the first and second digital values.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: March 19, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Hiroshi Kichise, Yoshitomo Tokumoto, Kazuya Sakai, Yutaro Ishimoto, Kaname Aoki
  • Ball screw device and steering system
    Patent number: 10234004
    Abstract: A ball screw device and a steering system that include a retainer having more uniform stiffness are provided. Between a rack shaft and a ball screw nut, a cylindrical retainer having a plurality of retainer grooves that retain balls in a rollable manner is provided. Each retainer groove has two short inner surfaces that intersect the extending direction of the retainer groove and two long inner surfaces that intersect these short inner surfaces and extend along the extending direction of the retainer groove. In each of interior-angle portions where the short inner surfaces and the long inner surfaces intersect, a corner round surface is formed. The radius of the corner round surface is set to be smaller than one half of the width of the retainer groove.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: March 19, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Toshihiro Asakura, Takuya Nakayama, Keisuke Ogawa
  • DRIVING FORCE TRANSMISSION CONTROL APPARATUS
    Publication number: 20190077257
    Abstract: A control apparatus configured to control a driving force transmission apparatus. The control apparatus includes a torque command value calculator configured to calculate a torque command value for the right and left rear wheels based on a front-rear wheel rotation speed difference, a command value limiter configured to limit the torque command value to a value equal to or smaller than an upper limit value, and a current controller configured to control a current to be supplied to the driving force transmission apparatus so that a driving force determined based on the torque command value is transmitted to the right and left rear wheels. When the front-rear wheel rotation speed difference increases, the command value limiter sets the upper limit value smaller as a change amount of the front-rear wheel rotation speed difference per unit time increases.
    Type: Application
    Filed: September 11, 2018
    Publication date: March 14, 2019
    Applicant: JTEKT CORPORATION
    Inventor: Hirokazu KONDO
  • STEERING CONTROL UNIT
    Publication number: 20190077448
    Abstract: The microcomputer included in the steering control unit calculates a basic assist component that is a component of the assist force, on the basis of the steering torque. The microcomputer calculates a damping compensation component that suppresses a sudden change in a rotation angle, on the basis of a rotational angular velocity that is a time rate of change of the rotation angle. The microcomputer calculates, independently of the damping compensation component, a return compensation component that suppresses influence of the damping compensation component, on the basis of the rotational angular velocity. The microcomputer compensates the basic assist component by using both the damping compensation component and the return compensation component, in a situation where the steering wheel comes back to the neutral position without a steering operation that a driver performs to return the steering wheel.
    Type: Application
    Filed: September 5, 2018
    Publication date: March 14, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Shigeto MATSUO, Yoshihiko SUGIMOTO, Akihiko NISHIMURA
  • Hub unit bearing
    Patent number: D843895
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: March 26, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yuya Inoue, Takaaki Onizuka, Toshihiro Hakata, Teruyuki Wakisaka, Takuya Toda