Patents Assigned to JTEKT
  • ROTARY DEVICE
    Publication number: 20190017542
    Abstract: A rotary device includes: a housing that accommodates a shaft; and a rolling bearing. The rolling bearing includes an outer ring that is attached to the housing, an inner ring that rotates integrally with the shaft, a plurality of tapered rollers, and a cage, and is configured to generate pumping action that causes fluid to flow with an axial component in a bearing annular space when the shaft rotates. A space in the housing on one side of the rolling bearing in the axial direction is a space that is closed except a side close to the rolling bearing. The rolling bearing further includes an oil reservoir portion provided to an end portion of the outer ring in the axial direction and configured to store lubricant between the oil reservoir portion and the outer ring.
    Type: Application
    Filed: July 5, 2018
    Publication date: January 17, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Akiyuki SUZUKI, Ryo SHIINA
  • Modelling of frictions in a power steering system using a scatter of points
    Patent number: 10180378
    Abstract: A method for evaluating the frictions in a power steering mechanism, the method including a step of acquiring a series of characterization points, during which are measured, for several different values taken successively by the assistance force during the operation of the steering mechanism, the corresponding friction values, so as to empirically obtain a series of distinct characterization points each associating a measured friction value to a measured value representative of the assistance force, then a step of constructing an empirical friction model, during which a correlation law is established between the characterization points constitutive of the series of characterization points, from the scatter chart formed by the series of the characterization points.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: January 15, 2019
    Assignee: JTEKT EUROPE
    Inventors: Sébastien Bourdrez, Pascal Moulaire, Christophe Ravier
  • Tapered roller bearing
    Patent number: 10180161
    Abstract: A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage that holds the tapered rollers. The cage has a small annular portion positioned on one side, in the axial direction, of the tapered rollers, a large annular portion positioned on the other side, in the axial direction, of the tapered rollers, and a plurality of cage bars that couple the small annular portion and the large annular portion to each other. The cage bars each have a cage bar end portion that is positioned between the large annular portion and a large rib and that projects toward the other side in the axial direction with respect to large end surfaces of the tapered rollers.
    Type: Grant
    Filed: November 13, 2017
    Date of Patent: January 15, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yuki Shishihara, Shigeo Kamamoto, Junji Murata
  • Hub unit
    Patent number: 10180160
    Abstract: A hub unit includes an outer ring, an inner shaft, rolling elements and a sealing device. The outer ring includes an outer ring body and an outer ring flange. The inner shaft includes an inner shaft body and an inner shaft flange. The outer ring body includes a first portion and a second portion. The first portion is an end part on the outer side of the outer ring body. The second portion is a part of the outer ring body between the first portion and the outer ring flange. The second portion includes an upper build-up portion. The upper build-up portion is formed in an upper part of the second portion and a thickness of the build-up portion is larger than thicknesses of side parts of the second portion. An upper end of the upper build-up portion is higher than an upper end of the first portion.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: January 15, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yuya Inoue, Takaaki Onizuka, Toshihiro Hakata, Teruyuki Wakisaka, Takuya Toda
  • STEERING APPARATUS
    Publication number: 20190009816
    Abstract: A steering apparatus includes: a first shaft which is coupled to a steering wheel; a torsion bar; a second shaft which is coupled to the first shaft through the torsion bar; a torsion bar torque detection unit detecting a torsion bar torque which is applied to the torsion bar; and an electronic control unit configured to estimate a driver torque which is applied to the steering wheel by a driver. The electronic control unit is configured to: i) compute a steering wheel rotation angle which is a rotation angle of the steering wheel; and ii) compute a value including an added value, as the driver torque, the added value being a value resulting from adding the torsion bar torque, a steering wheel inertia torque compensation value, and a gravity torque compensation value.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Applicant: JTEKT CORPORATION
    Inventors: Maxime MOREILLON, Tsutomu TAMURA, Robert FUCHS, Naoki SHOJI
  • STEERING SYSTEM AND METHOD FOR PRODUCING STEERING SYSTEM
    Publication number: 20190009814
    Abstract: The driven pulley is disposed around an outer periphery of a rack shaft coaxially therewith, and is fitted onto the ball screw nut so as to be integrally rotatable with an aligning structure interposed therebetween. The aligning structure includes locking grooves formed on an inner peripheral surface of the driven pulley, mounting grooves formed on an outer peripheral surface of the ball screw nut and radially opposed to the respective locking grooves, and elastic members. Each elastic member has a pair of base parts and a spring part integrally formed between the base parts, is disposed in the corresponding mounting groove with the base parts spaced apart from circumferential side surfaces, and is disposed between the mounting groove and the corresponding locking groove such that the spring part is locked on inner surfaces of the locking groove in a radially compressed manner.
    Type: Application
    Filed: June 29, 2018
    Publication date: January 10, 2019
    Applicant: JTEKT CORPORATION
    Inventor: Tatsuya OHASHI
  • Machining device with a detachably mounted spindle unit
    Patent number: 10173295
    Abstract: A machining device includes: a spindle unit including a spindle that rotates a workpiece; and a device base having the spindle unit mounted thereon. The spindle unit includes upper and lower rolls that rotate the workpiece by contacting the workpiece, upper and lower rotary shafts that rotate integrally with the upper and lower rolls and serves as the spindle, and a support member that supports the workpiece. The device base has mounted thereon the spindle unit, a motor that rotates the upper and lower rotary shafts, and a grindstone to be brought into contact with the workpiece. The spindle unit is detachably mounted on the device base.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: January 8, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Kenichiro Kitamura, Shinsaku Kozakai, Fumikazu Hirakawa, Naoya Okubo
  • Oil pump having extension portions that reduce the effect of #the collapse of bubbles in the oil
    Patent number: 10174757
    Abstract: In an oil pump, an inner rotor and an outer rotor rotate to discharge the oil through a discharge port. The discharge port has an outer extension portion located on a radially inner side with respect to a root circle of the outer rotor and on a radially outer side of a tip circle of the outer rotor and an inner extension portion located on the radially inner side with respect to the tip circle of the outer rotor and on the radially outer side with respect to a root circle of the inner rotor. An inter-tooth chamber facing a partitioning portion that partitions the suction port from the discharge port comes into communication with the outer extension portion and the inner extension portion. Then, a tip seal portion defining the inter-tooth chamber intersects an outer edge of an opening of the discharge port.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: January 8, 2019
    Assignee: JTEKT CORPORATION
    Inventor: Masaaki Oowaki
  • Steering system
    Patent number: 10173714
    Abstract: First teeth of a first tooth member that moves together with an upper jacket mesh with second teeth of a second tooth member. The second tooth member includes a received portion received by a receiving surface of a receiving member (energy absorption member). The second tooth member is rotatably supported by a fulcrum that is formed on the receiving surface at a contact position between the receiving surface and the received portion and is movable in a column axis direction. A guide shaft supported by a support member that is supported by a lower jacket is inserted into an elongated hole of the second tooth member, thereby guiding the second tooth member in a meshing and unmeshing direction.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: January 8, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Atsumune Nagatani, Yu Myohoji
  • Differential apparatus
    Patent number: 10173525
    Abstract: A differential apparatus includes a differential mechanism, a differential case that accommodates differential mechanism, and a clutch mechanism that transmits a driving force between the differential case and the differential mechanism. The clutch mechanism includes a slide member movable inside the differential case in an axial direction and an actuator for moving the slide member in the axial direction. The actuator is located outside the differential case. The slide member includes a first meshable portion and an engaging portion engaging with a pinion shaft of the differential mechanism. The differential case has a second meshable portion to mesh with the first meshable portion and a wall portion having multiple insertion holes for transmitting a moving force of the actuator to the slide member. The slide member is located between the second meshable portion and the wall portion.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: January 8, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yasunori Kamitani, Minoru Onitake, Tadashi Yoshisaka, He Jin
  • Rolling bearing
    Patent number: 10174790
    Abstract: An inner ring includes: a pair of shoulder outer peripheral surfaces on first and second axial sides of a raceway surface of the inner ring in contact with balls; seal grooves disposed in first and second axial ends of the inner ring and defining labyrinth clearances with lips; and edges disposed on the first and second axial sides. Each of the edges is configured to cause grease flowing along an associated one of the shoulder outer peripheral surfaces to leave the shoulder outer peripheral surface in the direction of an extension thereof. Each of the lips includes a lip oblique surface functioning as a guide surface to guide the grease that has left the edge not to a radially inner region of the bearing but to a radially outer region of the bearing.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: January 8, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yasuhiko Ishii, Youzou Taniguchi, Takashi Iwata
  • Method of manufacturing housing structure and housing structure
    Patent number: 10166705
    Abstract: A mold for insert molding, which houses an electronic unit including a first circuit portion and a second circuit portion protruding from the first circuit portion, is prepared. The mold includes an upper wall surface facing an upper surface of the second circuit portion and side wall surfaces facing side surfaces of the second circuit portion. The flow resistance of a resin flowing through a space between each side surface of the second circuit portion and the corresponding side wall surface is lower than that of the resin flowing through a space between the upper surface of the second circuit portion and the upper wall surface. Then, the electronic unit is placed in the mold. Then, the resin is injected into the mold in which the electronic unit has been placed. Thus, the electronic unit and the housing in which the electronic unit is housed are integrated with each other.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: January 1, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Takahiro Yukimura, Noriaki Matsui, Akihiro Takeuchi, Hiroshi Kutsumi, Shoichi Koyama, Fu Yao, Toshihiro Moriuchi, Kensaku Hotta, Satoshi Haraguchi, Yuki Kosumi, Masafumi Kajitani
  • Dog clutch and differential gear
    Patent number: 10167939
    Abstract: A dog clutch includes: a first rotational member; a second rotational member; a clutch member; and a pressing mechanism. The clutch member includes a meshing portion meshing with the second rotational member, an engageable portion circumferentially engaging with an engaged portion provided in the first rotational member, and a cam surface configured to generate a cam thrust in a direction of a rotation axis by a relative rotation with respect to the first rotational member. When the clutch member moves, a depth of meshing with the second rotational member is deepened by the cam thrust, and then the engageable portion engages with the engaged portion, so that the clutch member receives a torque from the first rotational member.
    Type: Grant
    Filed: January 9, 2017
    Date of Patent: January 1, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Minoru Onitake, Yasunori Kamitani, Motoyasu Yamamori
  • Taper roller bearing
    Patent number: 10167900
    Abstract: A taper roller bearing includes: an inner ring, an outer ring, a plurality of taper rollers, and an annular cage. The cage includes a small-diameter annular portion on one side in a axial direction, a large-diameter annular portion which is positioned on the other side in the axial direction and on a radial outer side of a large flange of the inner ring, and a plurality of column portions which link the small-diameter annular portion and the large-diameter annular portion. The taper roller bearing has a labyrinth structure which suppresses a flow of lubricating oil to the outside of the bearing from the inside of the bearing between the large flange and the large-diameter annular portion.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: January 1, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Shigeo Kamamoto, Junji Murata, Yuki Shishihara
  • Actuator control device
    Patent number: 10167014
    Abstract: The actuator control device includes an assist control circuit for calculating a first assist component and an automatic steering control circuit for calculating a second assist component. The automatic steering control circuit is allowed to calculate the second assist component while a steering torque is less than a first threshold value. The automatic steering control circuit calculates the second assist component by performing PID control that uses an integral term obtained on the basis of an angle deviation. When the steering torque is less than the first threshold value but not less than a second threshold value, the automatic steering control circuit limits the integral term in such a manner that it is harder for the integral term to increase while the steering torque is not less than the second threshold value than while the steering torque is less than the second threshold value.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: January 1, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Shingo Maeda, Takahiro Toko, Gempei Nakasone, Shinya Aono
  • Manufacturing method of rotating element, connecting structure between rotating element and rotating shaft, and steering apparatus
    Patent number: 10167902
    Abstract: A manufacturing method of a rotating element including a cylindrical fitting portion having a pair of circumferential end portions forming an axial slit between the circumferential end portions, the cylindrical fitting portion being serration-fitted to a rotating shaft, includes: clamping the fitting portion by a clamp jig so that the fitting portion is elastically deformed in an elliptical shape; forming a female serration arranged in an elliptical shape by use of a tool having an elliptical section, the female serration being formed on an inner peripheral surface of the fitting portion elastically deformed in the elliptical shape; and releasing the clamping by the clamp jig so that the arrangement of the female serration is changed to a perfect-circle shape from the elliptical shape.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: January 1, 2019
    Assignees: JTEKT CORPORATION, KOYO MACHINE INDUSTRIES CO., LTD.
    Inventors: Taisho Higuchi, Takeshi Koyama, Taiki Yamamura
  • Electric power steering system
    Patent number: 10167009
    Abstract: An electric power steering system includes a rack housing configured to accommodate a rack shaft, a pinion shaft meshed with the rack shaft, a speed-reducer including a worm wheel connected to a portion of the second pinion shaft protruding from the rack housing, a speed-reducer housing configured to accommodate the speed-reducer, and a seal member having an annular shape. The seal member is disposed closer to the second pinion gear than the worm wheel is, in the speed-reducer housing. The sear member seals a clearance between the second pinion shaft and the speed-reducer housing.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: January 1, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Hiroshi Yano, Hiroshi Negoro
  • Tapered roller bearing
    Patent number: 10167897
    Abstract: A tapered roller bearing includes an inner ring, an outer ring, a plurality of tapered rollers, and an annular cage. The cage has a small annular portion, a large annular portion, and a plurality of cage bars that couples the small annular portion and the large annular portion together. The cage is enabled to come into contact with an inner peripheral surface of the outer ring at least on an axially first side so that the contact allows the cage to be positioned in a radial direction. Each of the cage bars has pocket surfaces each of which faces an outer peripheral surface of the corresponding tapered roller, and each pocket surface has a flat surface shape that is straight in a direction from the inner ring toward the outer ring and that is enabled to come into line contact with the corresponding tapered roller.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: January 1, 2019
    Assignee: JTEKT CORPORATION
    Inventors: Yuki Shishihara, Shigeo Kamamoto, Junji Murata, Seiji Nakahama
  • DIFFERENTIAL DEVICE
    Publication number: 20180372202
    Abstract: A differential device includes: first and second side gears disposed side by side in the rotational axis direction; a pinion gear set in which two second pinion gears are meshed with a first pinion gear; and a housing that holds the pinion gear set. The first pinion gear has an axially one end-side gear portion meshed with the first side gear, and an axially other end-side gear portion meshed with the two second pinion gears. The axially one end-side gear portion and the axially other end-side gear portion are integral with each other. The two second pinion gears are meshed with the second side gear at positions away from each other in the circumferential direction of the second side gear. The axially other end-side gear portion of the first pinion gear is meshed with the two second pinion gears at positions on the radially outer side of the second side gear.
    Type: Application
    Filed: June 14, 2018
    Publication date: December 27, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Makoto NISHIJI, Tomoki YOSHIHAMA
  • AUXILIARY DRIVE DEVICE
    Publication number: 20180370356
    Abstract: An auxiliary drive device includes: a drive unit that has an electric motor; a meshing clutch that has a first meshing member and a second meshing member; an actuator that moves the second meshing member; and a control unit that controls the electric motor and the actuator. The actuator moves the second meshing member among a separation position, at which the second meshing member is not meshed with the first meshing member, an abutment position, at which first meshing teeth and second meshing teeth possibly abut against each other, and a meshing position, at which the first meshing teeth and the second meshing teeth are meshed with each other. The control unit makes a current supplied to the electric motor when the second meshing member is located between the abutment position and the meshing position smaller than a current required to maintain the rotational speed of the electric motor.
    Type: Application
    Filed: June 14, 2018
    Publication date: December 27, 2018
    Applicant: JTEKT CORPORATION
    Inventors: Ryohei Shigeta, Hiroshi Sumasu