Patents Assigned to JTEKT
  • Patent number: 9939017
    Abstract: A bearing ring for a strain wave gearing includes an inner ring that is rotatable together with an elliptic cam and elastically deformable, an outer ring that is rotatable together with a flex spline and elastically deformable, a plurality of balls provided between the inner ring and the outer ring, and a cage with a plurality of pockets which is arranged in a circumferential direction and in which the balls are housed. The cage has a ring portion and a plurality of cage bars extending from the ring portion in the axial direction. The pockets are each located between the cage bars adjacent to each other in the circumferential direction. A circumferential clearance between the ball and the cage bar is equal to or larger than a radial clearance of an outer annular space between the outer ring deformed into a non-circular shape and the cage.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: April 10, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Yoshihisa Maeoka
  • Patent number: 9937970
    Abstract: A telescopic shaft includes a hollow outer shaft, an inner shaft spline-fitted to the outer shaft, a resin coating provided on splines on at least one of the outer and inner shafts, and can be extended and contracted in an axial direction. A method for manufacturing the telescopic shaft includes press-fitting the inner shaft into the outer shaft and sliding one of the outer and inner shafts relative to the other of the outer and inner shafts by reciprocating the one shaft in the axial direction. In the sliding, a frequency according to a sliding speed at which the one shaft is slid relative to the other shaft is set to be lower than a predetermined value at the start of sliding, and the frequency is increased in a continuous or stepwise manner when a sliding load of the one shaft to the other shaft is reduced.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: April 10, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Kenji Higashi, Naoto Miyawaki
  • Patent number: 9942996
    Abstract: An electronic circuit unit is provided that allows the increase in the size thereof to be suppressed. An electronic circuit unit 1 includes a board, a housing, and a cover. A board mount portion is disposed in the closest position to an outer edge of the housing, except for peripheral walls of the housing. An outer edge of the board is placed on the board mount portion of the housing, and a peripheral portion of the cover is placed on the outer edge of the board. Screws are inserted into screw holes of the housing; spaces defined by recess portions of the board 10 and the peripheral walls; and screw holes of the cover. Then, the outer edge of the board is sandwiched between the board mount portion of the housing and the peripheral portion of the cover.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: April 10, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Yoshihiro Kojima
  • Patent number: 9937951
    Abstract: A reference position in a power steering system is defined by acquiring a first edge position corresponding to a first edge of a first index pulse generated when a movable steering member passes an indexed position in a first movement direction; acquiring a second edge position corresponding to a second edge of a second index pulse generated when the movable steering member passes the same indexed position in a second movement position opposite the first movement direction; and calculating the reference position from the first edge position and the second edge position.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: April 10, 2018
    Assignee: JTEKT EUROPE
    Inventors: Romaric Pregniard, Christophe Ravier, Xavier Palandre
  • Patent number: 9937949
    Abstract: A power transmission coupling that couples an output shaft of an electric motor and a worm shaft together includes a first rotation element coupled to the output shaft, a second rotation element coupled to the worm shaft, and an intermediate element formed of an elastic body and interposed between the first rotation element and the second rotation element. The intermediate element forms a unit integrally including an annular support portion, power transmission portions extending radially from the support portion and interposed between engaging protrusions of the first rotation element and the second rotation element, a spacer arranged inward of the support portion in a radial direction to apply a preload to the worm shaft in an axial direction, and a coupling portion that couples the support portion and the spacer together.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: April 10, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Arata Kikuchi, Wataru Yamada
  • Patent number: 9939024
    Abstract: Provided is a method of manufacturing a wheel bearing apparatus including an outer ring, a rolling element, a hub spindle, and an inner ring member. The hub spindle is disposed inward of the outer ring in a radial direction via the rolling element. The inner ring member fitted on the hub spindle and is secured by a clinched portion. The clinched portion is formed by clinching a spindle end portion of the hub spindle outward in the radial direction. The method includes: plating a predetermined area including the spindle end portion of the hub spindle; removing a plating of the spindle end portion of the predetermined area; and clinching the spindle end portion to form the clinched portion after removing the plating.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: April 10, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Tatsuya Yokota, Nobuyuki Seo
  • Publication number: 20180093566
    Abstract: A control device mounted on a four-wheel drive vehicle includes: a slip ratio calculating unit that obtains a slip ratio of main driving wheels based at least on wheel speeds; a smoothing unit that smooths the slip ratio by filtering; and a driving force control unit that controls a driving force transmission device so that a driving force that is transmitted to auxiliary driving wheels increases as the slip ratio smoothed by the smoothing unit increases.
    Type: Application
    Filed: October 3, 2017
    Publication date: April 5, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Hirokazu KONDO, Tomoaki KATO, Go NAGAYAMA, Akiyoshi KAKITA, Kotaro SARAI
  • Publication number: 20180094715
    Abstract: A play take-up device comprising a push button that is movably mounted and translationally guided, along a thrust axis 5, in a housing, to exert a thrust force against a rack, said device further comprising a resilient shock-absorbing member that is positioned between the push button and the housing, in contact, respectively, against a first bearing surface belonging to the push button, which is angled in relation to the thrust axis, and is preferably frusto-conical, and a second bearing surface belonging to the housing, referred to which has, opposite the distribution surface and counter to the resilient shock-absorbing member, both a radially extending component and an axially extending component, such that the shock-absorbing member simultaneously returns the push button axially towards the rack and transversely towards the thrust axis.
    Type: Application
    Filed: April 14, 2016
    Publication date: April 5, 2018
    Applicant: JTEKT EUROPE
    Inventor: Pascal VIZIER
  • Publication number: 20180092792
    Abstract: An assistance apparatus includes: a body brace; an output link to be put on an assistance subject body part, the output link pivoting about a joint in the assistance subject body part; an actuator including an output shaft that generates an assistance torque; a torque detection section provided at any position on the way from the output link to the output shaft (of the actuator); torque determination section for determining a combined torque that is a combination of a subject person torque input from the output link as a result of a subject person making the assistance subject body part pivot with the subject person's own strength and the assistance torque from the output shaft; and a controller that controls a rotational angle of the output shaft based on the combined torque.
    Type: Application
    Filed: October 3, 2017
    Publication date: April 5, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Hiromichi OHTA, Toshiki Kumeno
  • Publication number: 20180093565
    Abstract: A controller for a driving force transmitting apparatus mounted in a four-wheel-drive vehicle, includes: a driving force controller configured to calculate a command torque indicating a driving force to be transmitted to the sub-drive wheels via the driving force transmitting apparatus based on a traveling state of the four-wheel-drive vehicle and a road surface condition, and to control the driving force transmitting apparatus based on the command torque; and a road surface condition determiner configured to determine that the road surface condition is a high-? condition when a duration of a non-slipping state where a vehicle speed is equal to or higher than a prescribed value and a slip ratio of each of both the main drive wheels is lower than a prescribed value has become equal to or longer than a prescribed time.
    Type: Application
    Filed: October 4, 2017
    Publication date: April 5, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Hirokazu KONDO, Tomoaki KATO, Go NAGAYAMA, Akiyoshi KAKITA
  • Publication number: 20180093707
    Abstract: A vehicle steering system includes a steering operation mechanism configured to steer a steered wheel, and a steering operation motor configured to apply a drive force for steering the steered wheel to the steering operation mechanism. The steering operation mechanism includes an input shaft to which the drive force from the steering operation motor is input, an output shaft configured to output the drive force from the input shaft to the steered wheel, and a coupling mechanism configured to couple the input shaft and the output shaft to each other. The coupling mechanism includes a first universal joint and a second universal joint that transmit the drive force from the input shaft to the output shaft in a state in which the output shaft is angularly offset from the input shaft. The output shaft constitutes a part of a suspension.
    Type: Application
    Filed: September 27, 2017
    Publication date: April 5, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Ryoichi TOKIOKA, Yuzo NONOGUCHI
  • Publication number: 20180093701
    Abstract: A steering control device includes a controller configured to execute turning processing of controlling a controlled variable to a command value corresponding to an operation of a steering wheel by controlling a turning-side actuator in a cutoff state, the controlled variable being at least one of a turning angle of the steered wheels and a turning angle rate that is a changing rate of the turning angle; and transmission switching processing of controlling a switching device such that the switching device is switched from the cutoff state to a transmission state on condition that an absolute value of a difference between the controlled variable and the command value continues to be equal to or larger than a threshold when the turning processing is executed.
    Type: Application
    Filed: September 22, 2017
    Publication date: April 5, 2018
    Applicant: JTEKT CORPORATION
    Inventor: Takashi KODERA
  • Patent number: 9933016
    Abstract: A rolling bearing device includes a rolling bearing; and a spacer provided adjacent to one side of the rolling bearing in an axial direction and having a grease reservoir and a flow path, the grease reservoir being in a form of a groove, extending along a circumferential direction, and having grease reserved in the grease reservoir, and the flow path providing communication between the grease reservoir and an inner part of the rolling bearing. The spacer includes an annular wall surface that defines an inner periphery of the grease reservoir. An end of the annular wall surface on a side of the rolling bearing in the axial direction of the grease reservoir is continuous with an opposed end face of the spacer that is opposed to the rolling bearing. An entire area of the annular wall surface is constituted by a flat surface.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Yuki Shishihara
  • Patent number: 9933773
    Abstract: A monitoring device for a programmable controller includes: a display portion configured to display, on a display, a step that is being executed by the programmable controller among a plurality of steps in such a manner that the step can be distinguished from the other steps; a receiving portion configured to receive selection of a step serving as an initial point of reactivation in a case where a facility stops during a continuous operation by the programmable controller; and a change instruction generation portion configured to generate an instruction to the programmable controller so as to cause the programmable controller to restart execution of control processes from the step received by the receiving portion at the time of the reactivation.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: April 3, 2018
    Assignees: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akihiro Shimizu, Terukazu Senda, Masanori Muramatsu, Kouji Hamakawa, Kenzou Mima, Kouji Yamashiro
  • Patent number: 9933050
    Abstract: A steering system is provided in which a bearing of a tension pulley has a reduced load-carrying capacity. A belt tension adjusting mechanism has a seat provided on an inner surface of a reduction gear housing so as to be able to swing, a rod that is in abutting contact with the seat (bent portion), a feed nut that is screw-threaded over the rod, and a spring member (helical torsion spring) that is fixed to the feed nut at its one end and to the reduction gear housing at the other end. When the belt is loosened, the feed nut is rotated by an elastic force of the spring member, and in conjunction with the rotation, the rod moves away from the feed nut to push the seat (bent portion).
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventor: Yasuharu Yamamoto
  • Patent number: 9932069
    Abstract: When a vehicle is quickly steered while the vehicle is travelling at an extremely low speed, a load on an in-vehicle power supply is reduced without deteriorating a steering feeling by reducing a motor driving current. A steering speed is compared with a threshold. When the steering speed is lower than the threshold, the process proceeds to step S6. In step S6, a voltage value of a battery power supply, which is used as a prescribed value, is set as a limit voltage in order to reduce a motor consumption current. When the steering speed is higher than the threshold, a value “V0/n” lower than the prescribed value is set as the limit voltage to reduce a consumption current when the steering wheel is steered without driving. “n” is “delay adjustment parameter”, and is a real number that exceeds 1.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Toyoki Sugiyama, Yasuyuki Yoshii
  • Patent number: 9933014
    Abstract: A cylindrical rack bushing is interposed between a tubular housing and a rack shaft inserted coaxially through the housing, and supports the rack shaft so that the rack shaft is slidable in an axial direction. The rack bushing has an inner periphery on which an inward protruding portion protruding toward an inner side of the rack bushing in a radial direction is formed. The inward protruding portion includes a top portion that is in sliding contact with the rack shaft in a line contact manner or a point contact manner.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Tetsuo Ikeda, Hidetoshi Sumihara
  • Patent number: 9931930
    Abstract: A driving force transmission apparatus includes: a pinion gear shaft having a pinion teeth portion, a first shaft portion extending from one side of the pinion teeth portion, and a second shaft portion extending from the other side of the pinion teeth portion; a ring gear meshing with the pinion teeth portion; a clutch housing capable of rotating relative to the pinion gear shaft on a rotation axis in coincidence with a rotation axis of the pinion gear shaft; a clutch mechanism located between the clutch housing and the first shaft portion of the pinion gear shaft; and a differential carrier accommodating the ring gear. The first shaft portion and the second shaft portion of the pinion gear shaft are supported by a first bearing and a second bearing, respectively. The clutch housing is supported by the pinion gear shaft through a third bearing fitted on the first shaft portion.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Isao Ito, Hiroshi Takuno, Noriyuki Fujii, Ryouichi Kubo
  • Patent number: 9933008
    Abstract: A rack-and-pinion type steering device includes a ball joint for connecting a rack shaft and a tie rod. The ball joint includes a socket and a ball. The socket is provided with a regulated surface allowed to contact a regulating surface of a rack housing, and a screw projecting from the regulated surface to be connected to the rack shaft. The regulated surface includes an intermediate portion having a curved surface shape that recedes from a regulating surface in a longitudinal direction of the rack shaft toward the outer circumference, and the regulated surface has such a shape that a pointed portion toward the regulating surface is less likely to be formed on the regulated surface even if a processing error occurs in the processing for forming the regulated surface of the socket.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: April 3, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Shuji Takahashi, Akihiro Toshima
  • Publication number: 20180086369
    Abstract: A motor controller includes control systems that control actuation of a motor. Each control system includes a drive circuit and a calculation unit. The calculation unit of each control system is connected to an independent rotation angle sensor. The calculation units include master and slave calculation units. The master and slave calculation units control actuation of the corresponding drive circuit based on a current instruction value calculated by the master calculation unit and a detection result of the rotation angle sensor connected to the master calculation unit. When the detection result of the rotation angle sensor connected to the master calculation unit is abnormal, the master and slave calculation units each use a detection result of the rotation angle sensor connected to the slave calculation unit to control the actuation of the corresponding drive circuit.
    Type: Application
    Filed: September 7, 2017
    Publication date: March 29, 2018
    Applicants: JTEKT CORPORATION, JAPAN AUTOMOBILE RESEARCH INSTITUTTE
    Inventor: Takuya YANAGI