Patents Assigned to JTEKT
  • Vehicle control device
    Patent number: 9694710
    Abstract: A vehicle control device controls torque of a drive motor such that rotation of the drive motor is transferred to rear drive wheels of a vehicle via a drive unit that includes a speed reducer including a plurality of gears rotatably supported by bearings. The vehicle control device sets different values as torque restriction values for torque to be generated by the drive motor when the vehicle is driven forward and when the vehicle is driven rearward.
    Type: Grant
    Filed: April 6, 2015
    Date of Patent: July 4, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Ryohei Shigeta, Yoshinao Iwase, Keita Nomura, Ryouichi Kubo
  • Method of manufacturing bar member and bar member
    Patent number: 9695925
    Abstract: A method of manufacturing a bar member including a pipe and metal members includes: forming a core member including a metal ring having an outer peripheral face subjected to face roughening and a mandrel; winding glass fibers around the outer peripheral face; winding a carbon fiber prepreg around the core member; forming the pipe externally fitted and fixed to the outer peripheral face by baking and curing the carbon fiber prepreg; pulling the mandrel out of the pipe; and screwing together the metal members and the metal ring.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: July 4, 2017
    Assignees: JTEKT CORPORATION, IBARAKI INDUSTRIAL CORPORATION
    Inventors: Shuji Toyodome, Takeshi Kunishima
  • Steering device
    Patent number: 9694842
    Abstract: A first plate of a stationary bracket has long holes which extend parallel to a column movement direction, and through which large-diameter portions of suspension bolts are passed. The inner circumferences of the long holes include: recessed curved surface portions of end portions in a direction opposite to the column movement direction; first inner edge portions which are on the side of a middle position between the long holes; and second inner edge portions. In a secondary collision, when the one suspension bolt slides over the first inner edge portion of the long hole, for example, a gap is formed between the other suspension bolt and the second inner edge portion of the long hole.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: July 4, 2017
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Eiji Tanaka, Susumu Imagaki, Atsushi Tano, Hiroshi Kawakami, Kenji Imamura
  • Steering system
    Patent number: 9694843
    Abstract: A rack-and-pinion steering system includes a pinion shaft having pinion teeth, a rack shaft on which rack teeth are formed which mesh with the pinion teeth; and a rack bush which supports the rack shaft slidably in an axial direction thereof. An outer circumferential surface of the rack shaft includes a first area which is a concave formed on an outer circumferential surface of the rack shaft and extending in the axial direction and a second area which is an area of the outer circumferential surface excluding the first area and lies adjacent to an end portion of the first area in the axial direction. The rack teeth are formed in the first area. A chamfered portion or a rounded portion is provided on a boundary between the end portion of the first area and the second area to chamfer or round a corner portion on the boundary.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: July 4, 2017
    Assignees: JTEKT CORPORATION, HONDA MOTOR CO., LTD.
    Inventors: Nobuyuki Taoka, Yoshiyuki Maenaka, Nariaki Sakamoto, Hideo Kometani, Masashi Fujimoto, Agen Nishikido, Isao Shintani, Takumitsu Otani, Hayato Miyakawa
  • Electric power steering system
    Patent number: 9694844
    Abstract: An electric power steering system includes a control unit configured to: compute an assist control amount (current amount), based on multiple kinds of state quantities indicating a steering state; control a motor based on the assist control amount, the motor being a source of assist force to be applied to a steering system of a vehicle; individually set, for the respective state quantities, limiting values that limit a variation range of the assist control amount, based on the respective state quantities used to compute the assist control amount; limit a value of the assist control amount using the limiting values; acquire a command value generated by a host control unit to change the assist control amount; and take the command value into account in setting of at least one of the limiting values, when executing control of the motor based on the assist control amount that reflects the command value.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: July 4, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Shingo Maeda, Terutaka Tamaizumi, Hidenori Itamoto
  • Vehicle Steering Device
    Publication number: 20170183032
    Abstract: A vehicle steering device includes a driver torque estimation unit that includes a driver torque estimation observer, a low-pass filter, and a hands-on/off determination unit. The driver torque estimation observer estimates driver torque applied to a steering wheel by a driver on the basis of a detected value that includes at least torsion bar torque detected by a torque sensor and the rotational angle of an electric motor detected by a rotational angle sensor. The low-pass filter performs a low-pass filtering process on the estimated driver torque. The hands-on/off determination unit determines whether in a hands-on state or a hands-off state on the basis of the driver torque after being subjected to the low-pass filtering process.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Frederic WILHELM, Tsutomu TAMURA, Robert FUCHS, Maxime MOREILLON
  • FOUR-WHEEL DRIVE VEHICLE
    Publication number: 20170182885
    Abstract: A four-wheel drive vehicle includes a friction clutch that transmits a driving force to rear wheels, a hydraulic circuit including a control valve that reduces a pressure of hydraulic oil discharged from a hydraulic pump down to a control pressure corresponding to a control current, and the cylinder and a piston that receives the oil from hydraulic circuit the to press the friction clutch. In the hydraulic circuit, a ratio of an change amount in a feeding pressure to the cylinder to an change amount in the control current, when the feeding pressure to the cylinder is lower than a predetermined value, is lower than when the feeding pressure applied to the cylinder is equal to or higher than the predetermined value. The control apparatus controls a pressure of the hydraulic oil fed to the cylinder lower than the predetermined value when switching the driving state.
    Type: Application
    Filed: December 19, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Yoshinori SUZUKI, Yasufumi NAKAMURA, Kaori FUJITA
  • Rolling Bearing
    Publication number: 20170184153
    Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and an annular cage that holds the balls at intervals in a circumferential direction. The cage has an annular portion on a first side in an axial direction, and a plurality of cage bars. Pockets that hold the respective balls are each formed between a pair of the cage bars adjacent to each other in the circumferential direction on a second side in the axial direction with respect to the annular portion. Each of the pockets has a pocket surface shaped along a cylindrical surface centered around a center line that is a virtual line extending in a bearing radial direction. A linear protrusion that is elongate in a direction parallel to the center line is provided at an axially-first-side bottom portion of the pocket surface.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Youzou TANIGUCHI, Takashi IWATA
  • ASSIST DEVICE, SWINGING JOINT DEVICE, LINEAR MOTION VARIABLE RIGIDITY UNIT, AND MACHINE TOOL
    Publication number: 20170181917
    Abstract: An assist device is connected to a moving body that performs a reciprocating swing motion. The assist device includes a first output portion configured to swing around a swing center as a center of a swing motion; a variable rigidity device including an elastic body configured to accumulate energy and release the energy in accordance with a first swinging angle as a swinging angle of the first output portion, and a rigidity varying unit configured to change an apparent rigidity of the elastic body seen from the first output portion; a first angle detecting portion configured to detect the first swinging angle; and a control device configured to adjust the apparent rigidity of the elastic body seen from the first output portion by controlling the rigidity varying unit in accordance with the first swinging angle detected by the first angle detecting portion.
    Type: Application
    Filed: December 22, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Hiromichi OHTA, Yoshitaka YOSHIMI, Kazuyoshi OHTSUBO
  • DRIVE FORCE TRANSFER DEVICE
    Publication number: 20170184157
    Abstract: A drive force transfer device that includes a friction clutch with improved response at the time when the friction clutch is pressed by a hydraulic pressure is provided. A drive force transfer device has: a clutch drum; an inner shaft; a friction clutch that has a plurality of outer clutch plates that are rotatable together with the clutch drum and a plurality of inner clutch plates that are rotatable together with the inner shaft; a piston that receives a hydraulic pressure supplied to a cylinder to press the friction clutch; and a hydraulic circuit that supplies the cylinder with working oil. The hydraulic circuit has a first pump portion that supplies the cylinder with the working oil, and a second pump portion that supplies the cylinder with the working oil at a pressure that is higher than that of the working oil supplied by the first pump portion.
    Type: Application
    Filed: December 22, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Noriyuki FUJII, Hiroshi TAKUNO, Yutaka MURAKOSHI, Yohei FUJII
  • Interior Permanent Magnet Rotor Unit
    Publication number: 20170187255
    Abstract: An object is to provide an interior permanent magnet rotor unit that allows possible demagnetization to be suppressed regardless of a material for a portion of a permanent magnet, which is positioned on an outward side in a radial direction of a core. A core is a laminate of first thin-plate-like members and second thin-plate-like members. The first thin-plate-like members and the second thin-plate-like members have first insertion slots and second insertion slots each of which is filled with a permanent magnet. In the first thin-plate-like members, a separating portion is formed at an end of each of the first insertion slots or the second insertion slots, which end is located on an outward side of the insertion slot in a radial direction, to form a slit in the corresponding permanent magnet.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Naotake KANDA, Hiroshi YOSHIKAWA, Taiki TAKEUCHI, Yoshiyuki SHIBATA
  • ROLLING BEARING
    Publication number: 20170184152
    Abstract: A rolling bearing includes an inner ring, an outer ring, a plurality of balls, and an annular cage. The cage has an annular portion provided on a first side in an axial direction with respect to the balls and a plurality of cage bars. Pockets that house the balls are each formed between the cage bars adjacent to each other in a circumferential direction. An axially-first-side side surface of the annular portion has a first surface that is inclined toward the first side in the axial direction as the first surface extends outward in a radial direction and a second surface provided outward of the first surface in the radial direction and positioned on the second side in the axial direction with respect to an extended virtual plane of the first surface.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 29, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Youzou TANIGUCHI, Takashi IWATA
  • Electromagnetic clutch device
    Patent number: 9689438
    Abstract: An electromagnetic clutch device includes meshing member connected to a first rotational member, a biasing member that biases the meshing member in a direction where a second meshing portion is meshed with a first meshing portion, and a pressing mechanism including a locking portion that presses the meshing member against a biasing force of the biasing member so as to axially move the meshing member. The locking portion is axially immovable relative to the second rotational member, and a cylindrical cam member is provided with a plurality of locked portions to be locked at different axial positions. Locking of the locking portion is shifted from one of the plurality of locked portions to another locked portion placed at a different axial position, and friction torque is caused to synchronize rotation of the first rotational member with that of the second rotational member.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: June 27, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Noriyuki Fujii, Kunihiko Suzuki, Hiroshi Takuno
  • Worm speed reducer and method for manufacturing worm wheel included in worm speed reducer
    Patent number: 9689464
    Abstract: A plane that contains a central axis of a worm shaft and that is orthogonal to a central axis of a worm wheel is arranged at a central position of the worm wheel in a tooth width direction thereof when no load is applied to a worm speed reducer. The worm wheel is formed by a cutting operation using a hob with a hob center offset from the central position toward an offset direction corresponding to a first direction along the tooth width direction. A pair of tooth flanks has different pressure angles at the central portion in the tooth width direction.
    Type: Grant
    Filed: June 11, 2015
    Date of Patent: June 27, 2017
    Assignee: JTEKT CORPORATION
    Inventor: Jun Hamakita
  • Rolling bearing
    Patent number: 9689423
    Abstract: A cage has a small-diameter annular portion provided between an inner ring and an outer ring on a first side of a bearing in an axial direction and a plurality of cage bars extending from the small-diameter annular portion toward a second side of the bearing in the axial direction. In each of an inner peripheral surface and an outer peripheral surface of the small-diameter annular portion, recessed portions are formed which is each open toward a bearing exterior on the first side of the bearing in the axial direction. An inner wall of each recessed portion has an inclined surface that serves to enlarge a cross section of the recessed portion toward the bearing exterior on the first side of the bearing in the axial direction.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: June 27, 2017
    Assignee: JTEKT CORPORATION
    Inventor: Akiyuki Suzuki
  • Torque sensor and electric power steering system
    Patent number: 9689761
    Abstract: A torque sensor includes a first magnet fixed to a first shaft, a tubular magnetic yoke assembly in which a magnetic yoke core is molded with a resin member, and a first magnetic sensor that detects a magnetic flux from the first magnet induced by the magnetic yoke core. The torque sensor also includes a collar made of a ferromagnetic body that is fixed to an inner circumference of the magnetic yoke assembly and to which a second shaft is press-fitted and fixed, and a second magnet for an index sensor that is disposed on an outer circumference of the magnetic yoke assembly. At least a part of the collar is disposed between the magnetic yoke core and the second magnet with respect to an axial direction of the magnetic yoke assembly.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: June 27, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Yusuke Matsui, Kensaku Hotta
  • Filament winding method and filament winding apparatus
    Patent number: 9688505
    Abstract: Provided are a filament winding method and a filament winding apparatus, in which, when a new bobbin is mounted on a bobbin rotation driving device, the control device is programmed to rotate the bobbin and oscillate a dancer while maintaining a state where a distal end of filament unwound through the dancer is fixed further beyond the dancer and the filament is stretched. The control device is programmed to obtain a bobbin diameter of the bobbin mounted on the bobbin rotation driving device based on a length of the dancer, an oscillation angle of the dancer, and a rotation angle of the bobbin.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: June 27, 2017
    Assignees: JTEKT Corporation, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuji Yamaguchi, Hisaki Kojima, Tadashi Ohtani, Takeshi Fujii
  • ELECTRIC PUMP SYSTEM
    Publication number: 20170175745
    Abstract: An electric pump system includes a pump, a motor, and a control circuit. The motor drives the pump. The control circuit controls operation of the motor. The control circuit includes a determination circuit, a generation circuit, and a drive circuit. The determination circuit determines the amount of fluid to be discharged from the pump. The generation circuit generates, based on a maximum rotational speed of the motor, a control profile that is used to control the number of revolutions of the motor. The maximum rotational speed of the motor is set according to the environment in which the pump is used. The control profile is used for the pump to discharge the amount of fluid determined by the determination circuit in the shortest time. The drive circuit drives the motor based on the control profile generated by the generation circuit.
    Type: Application
    Filed: December 16, 2016
    Publication date: June 22, 2017
    Applicant: JTEKT CORPORATION
    Inventor: Hiroki KAGAWA
  • Tapered Roller Bearing
    Publication number: 20170175816
    Abstract: A tapered roller bearing includes an outer ring, an inner ring, tapered rollers, a cage, and a lubricant holding member. The cage is formed of resin. Since the cage is formed of resin, the tapered roller bearing can be downsized with contact between the cage and the lubricant holding member avoided.
    Type: Application
    Filed: December 8, 2016
    Publication date: June 22, 2017
    Applicant: JTEKT CORPORATION
    Inventor: Akiyuki SUZUKI
  • Operational panel for machine tool
    Patent number: D791194
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: July 4, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Kazuhiro Tsujimura, Tomokazu Takayama, Masanori Ando, Takahito Umeki