Patents Assigned to JTEKT
  • Patent number: 9776656
    Abstract: In an electric power steering system, an ECU includes a rotation angle calculation unit, an assist torque command value calculation unit, a reference model, an angle deviation calculation unit, a PD control unit, an addition unit, and a plant observer. A proportional gain and a derivative gain which are used in the PD control unit and a first gain and a second gain which are used in a first gain multiplication unit and a second gain multiplication unit of the plant observer are set so that a characteristic equation corresponding to an equation of motion representing behavior of the electric power steering system has a double root.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: October 3, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Frederic Wilhelm, Tsutomu Tamura, Robert Fuchs, Philippe Mullhaupt
  • Patent number: 9778638
    Abstract: A PLC communication system includes a PLC; a plurality of devices; three or more communication processing nodes that are provided respectively in the PLC and the devices to allow the PLC to communicate with each of the devices; and a plurality of communication lines that connect the communication processing nodes to each other to allow data communication. The PLC detects an incommunicable state between two of the communication processing nodes. The PLC communication system further includes a display device, and in a case where there are a plurality of types of incommunicable states detected by the PLC, the display device displays a portion where communication lines constituting the incommunicable states among the plurality of communication lines overlap with each other, as a line failure portion.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: October 3, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Satoshi Kato, Yasuteru Yamauchi, Terukazu Senda
  • Publication number: 20170276192
    Abstract: A clutch device includes an outer member including a cylindrical part having an inner peripheral surface provided with outer projections extending in an axial direction; an inner member rotatable relative to the outer member; an outer friction member engaging with the outer projections such that the outer friction member is movable in the axial direction and rotation of the outer friction member relative to the outer member is restricted; an inner friction member whose rotation relative to the inner member is restricted, and which generates a frictional force between the inner and outer friction members; and a lubricating oil sealed in a clutch chamber located between the outer member and the inner member. The outer member is provided with an oil pocket recessed to a position outward of a bottom surface of a recessed part located between a pair of adjacent outer projections among the outer projections.
    Type: Application
    Filed: March 20, 2017
    Publication date: September 28, 2017
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yutaka YAMASHITA, Kunihiko SUZUKI, Takahiro YOSHIMURA
  • Publication number: 20170274492
    Abstract: In a cam grinding method, a common surface of a first cam and a second cam is acquired in a common surface setting step. In a first common surface grinding step performed after a first cam grinding step, traverse movement of a grinding wheel is performed such that the grinding wheel is aligned with an area from the first cam to the second cam while the first cam and the second cam are rotated, and the common surface is ground. In a second common surface grinding step performed after a second cam grinding step, traverse movement of the grinding wheel is performed such that the grinding wheel is aligned with an area from the second cam to the first cam while the first cam and the second cam are rotated, and the common surface is ground.
    Type: Application
    Filed: March 22, 2017
    Publication date: September 28, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Masaharu INOUE, Yoshihiro MIZUTANI, Satoshi ABETA
  • Publication number: 20170276177
    Abstract: A bearing device includes a bearing portion that includes an inner ring, an outer ring, a plurality of rolling elements that are interposed between the inner ring and the outer ring, and a cage that holds the plurality of rolling elements, one of the inner ring and the outer ring being a rotational ring, and another of the inner ring and the outer ring being a fixed ring; and an oil supply unit that is provided adjacent to the bearing portion in an axial direction. The cage includes a guide portion that is configured to be in sliding contact with a part of the fixed ring via lubricating oil. The oil supply unit includes a vibration sensor configured to detect a vibration of the fixed ring, and a pump configured to supply the lubricating oil to the bearing portion.
    Type: Application
    Filed: March 16, 2017
    Publication date: September 28, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Mikio NOZAKI, Yoshimichi HIGASHIYAMA
  • Publication number: 20170279340
    Abstract: An orientation magnetization device includes plural orientation magnetization yokes and plural orientation magnetization magnets, and molds field magnets while a rotor core is disposed in a magnetic circuit that is formed by assembling the orientation magnetization yokes and the orientation magnetization magnets into an annular shape. When the rotor core is disposed in the magnetic circuit, protruding portions are disposed at portions of the respective orientation magnetization yokes facing the rotor core. Auxiliary magnets are disposed in gaps between the respective orientation magnetization magnets and the rotor core, on opposite sides of each protruding portion in a circumferential direction of the orientation magnetization device. Each protruding portion and each auxiliary magnet extend in an axial direction of the orientation magnetization device, and are skewed with respect to the axial direction of the orientation magnetization device.
    Type: Application
    Filed: March 16, 2017
    Publication date: September 28, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Taiki TAKEUCHI, Hiroshi YOSHIKAWA, Naotake KANDA, Yoshiyuki SHIBATA, Koji TACHI
  • Publication number: 20170276133
    Abstract: A vane pump sucks the hydraulic fluid from a first inlet port and discharges it into a first outlet port and, at the same time, sucks the hydraulic fluid from a second inlet port and discharges it into a second outlet port, as a rotor having a plurality of slits housing vanes and extending in a radial manner rotates. The vane pump has a first back-pressure groove that is communicated with some of the slits to supply a back pressure from the first outlet port to the corresponding vanes and a second back-pressure groove that is communicated with other of the slits to supply a back pressure from the second outlet port to the corresponding vanes. The vanes to which the back pressure is supplied from the first back-pressure groove include the vanes in pump chambers into which the hydraulic fluid is sucked from the second inlet port.
    Type: Application
    Filed: March 22, 2017
    Publication date: September 28, 2017
    Applicant: JTEKT CORPORATION
    Inventor: Naohito YOSHIDA
  • Patent number: 9771941
    Abstract: A closing cover integrally includes a cover main body, and a ventilation cap body. The ventilation cap body has a connecting portion that is integrally connected to the cover main body, and at least one ventilation passage hole that is disposed in the connecting portion to perpendicularly extend, and has a depth smaller than a plate thickness of the cover main body. A ventilation recessed portion is formed at a location that is positioned on an inner surface of the ventilation cap body of the closing cover. An inner wall surface defining the ventilation recessed portion is formed in such a shape that a deep side of the ventilation passage hole is opened to the inner wall surface defining the ventilation recessed portion to form a ventilation passage. A ventilation filter is installed on an inner opening portion of the ventilation recessed portion.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Yuichi Yoshioka, Sayaka Sugano
  • Patent number: 9771098
    Abstract: A motor control device includes a motor drive circuit and a microcomputer that controls the drive circuit. The microcomputer generates a control signal on the basis of duty command values Du, Dv, and Dw to control the drive circuit. The microcomputer includes a dead time compensation section that corrects the duty command values Du, Dv, and Dw on the basis of dead time compensation values Ddu, Ddv, and Ddw. The dead time compensation section includes a basic compensation value computation section that computes a basic compensation value Dd as a fundamental value of the dead time compensation values Ddu, Ddv, and Ddw, and a filter section that performs a filtering process corresponding to a low-pass filter on the basic compensation value Dd. The dead time compensation section sets the dead time compensation values Ddu, Ddv, and Ddw on the basis of an output value ? from the filter section.
    Type: Grant
    Filed: February 27, 2015
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Satoru Mikamo, Ayumi Koike
  • Patent number: 9772239
    Abstract: A torque detection apparatus includes a magnetic element that outputs a signal corresponding to a magnetic flux from a magnetic circuit including a magnetic yoke. The torque detection apparatus further includes a signal retrieval member electrically connected to the magnetic element, and a unit housing formed of resin and molded integrally with the magnetic element and the signal retrieval member so as to cover the magnetic element and the signal retrieval member. The unit housing includes a body portion provided with an internal space in which the magnetic yoke is housed, and a connector portion provided with an internal space in which an end of the signal retrieval member exposed from the resin is disposed. In the unit housing, a communication path is formed through which the internal space is in communication with the internal space.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Yusuke Matsui, Kensaku Hotta
  • Patent number: 9771969
    Abstract: In a method of manufacturing an intermediate shaft including: an internal shaft having an external spline; a tubular external shaft having on an inner circumference thereof an internal spline; and a resin coating provided on the external spline, a central axis line of an internal shaft manufacturing intermediate product and a central axis line of an external shaft manufacturing intermediate product are aligned with each other, and the internal shaft manufacturing intermediate product and the external shaft manufacturing intermediate product are held in such a way that the central axis lines thereof can be adjusted, in a heating adaptation step. In this state, the internal shaft manufacturing intermediate product and the external shaft manufacturing intermediate product slide relatively in an axial direction. In the heating adaptation step, a grease is interposed between the internal shaft manufacturing intermediate product and the external shaft manufacturing intermediate product.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventor: Ryoichi Tokioka
  • Patent number: 9772249
    Abstract: A sensor device, such as a torque sensor, of a motor control device or an electric power steering apparatus includes a sensor section that detects a quantity of state of a detection subject and outputs a detection signal corresponding to the detected quantity of state. When receiving a specific trigger transmitted from an external device, the sensor section outputs an abnormality diagnosis signal, which is configured by a predetermined waveform and used for determining whether there is an output abnormality of the sensor section, and then outputs the detection signal.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: September 26, 2017
    Assignees: JTEKT CORPORATION, DENSO CORPORATION
    Inventors: Naoki Yamano, Yuko Onoda, Satoru Mikamo, Akira Yamamoto, Hideki Kabune
  • Patent number: 9770982
    Abstract: Provided is a control device for a four-wheel drive which can maintain driving stability while restraining noise and vibration. A control device includes: a second control device that, when at least one of front wheel has slipped, engages a dog clutch after rotating a propeller shaft by a rotational force transmitted via first and second friction clutches; and a third control device that, if a predetermined condition is satisfied when the front wheels are not slipping, engages the dog clutch after rotating the propeller shaft by the rotational force transmitted via the first and second friction clutches. The time required to synchronize the dog clutch by the third control device is longer than that required to synchronize the dog clutch by the second control device.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Tomohiro Nozu, Masaki Mita, Akira Kodama, Shotaro Niimi
  • Publication number: 20170272009
    Abstract: A steering control device capable of suppressing a reduction in reliability even in the case where the redundancy of the power source is increased is provided. A steering ECU includes two control systems in which different external power sources are connected to two drive circuits. The low potential sides of the drive circuits and the low potential sides of the corresponding external power sources are independently connected to each other via power source ground lines for the two control systems. The low potential sides of the drive circuits are connected to each other via an internal ground. Two current detection circuits are provided between the power source ground lines and the internal ground to detect power source ground current values, respectively. The steering ECU includes microcomputers that detect a ground abnormality on the basis of the results of detection performed by the current detection circuits.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 21, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi KAWAMURA, Toshihiro TAKAHASHI, Tomohiro NIWA, Kenichi TOYOZUMI, Takahito HASHIMOTO
  • Publication number: 20170267277
    Abstract: A steering system includes a rack housing in which a rack shaft is housed, rack ends fitted to respective end portions of the rack shaft and coupled to respective steered wheels, and shock-absorbing members provided between the rack housing and the respective rack ends. When the rack shaft moves in a direction in which an end face of the rack end approaches a restricting surface of the rack housing and thus the rack shaft reaches a position after the shock-absorbing member is compressed by a compression amount, a control unit creates a normal input end through electronic stopper control of reducing an assisting force to be generated by a motor. This restricts movement of the rack shaft in a direction in which the end face approaches the restricting surface.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 21, 2017
    Applicant: JTEKT CORPORATION
    Inventor: Tatsuya OHASHI
  • Publication number: 20170267276
    Abstract: A steering control apparatus includes a steering angle feedback processing unit and an operation signal generation processing unit that operate a reaction force actuator to adjust a steering angle to a target steering angle that is a target value for the steering angle based on feedback control, an ideal-axial-force calculation unit that calculates an ideal axial force, a road-surface-axial-force calculation unit that calculates a road surface axial force, an axial-force allocation calculation unit that calculates a base reaction force in which the ideal axial force and the road surface axial force are allocated in a predetermined ratio, and a target steering angle calculation processing unit that sets a target steering angle based on the base reaction force. The steering angle feedback processing unit feeds back the target steering angle in which road surface information is incorporated through the road surface axial force, so that the steering angle is controlled.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 21, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Takashi KODERA, Naoki YAMANO, Hidenori ITAMOTO, Yoshihiro YAMASHITA, Koji ANRAKU
  • Publication number: 20170268570
    Abstract: A cage has an annular portion positioned on an axially first side of balls and a plurality of cage bars provided to extend from the annular portion toward an axially second side. Pockets each housing a corresponding one of the balls correspond to areas each located on the axially second side of the annular portion and between two cage bars adjacent to each other in a circumferential direction. Each of the balls is exposed from axially-second-side ends of the corresponding cage bars over an axially-second-side range. An axial dimension of the range over which the ball is exposed from the axially-second-side ends is 30% or more and 50% or less of the diameter of the ball.
    Type: Application
    Filed: March 7, 2017
    Publication date: September 21, 2017
    Applicant: JTEKT CORPORATION
    Inventors: Shigeo KAMAMOTO, Junji MURATA, Yuki SHISHIHARA
  • Publication number: 20170267282
    Abstract: A damper apparatus includes a shock-absorbing member configured to absorb a shock while restricting movement of a shaft relative to a housing. The shock-absorbing member includes a shock-receiving member configured to come into contact with one member, which is one of a large-diameter portion of the shaft and a restriction portion of the housing, and a pre-compression spring disposed between the other member, which is the other of the large-diameter portion and the restriction portion, and the shock-receiving member in a state where the pre-compression spring is compressed in advance in an axial direction. The pre-compression spring is configured to urge the one member in the axial direction via the shock-receiving member when the large-diameter portion is relatively moved toward the restriction portion beyond a prescribed position.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 21, 2017
    Applicant: JTEKT CORPORATION
    Inventor: Toshiaki OGATA
  • Patent number: D798312
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Kazuhiro Tsujimura, Tomokazu Takayama, Takahito Umeki, Masanori Ando, Hiroyuki Tsusaka
  • Patent number: D798313
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: September 26, 2017
    Assignee: JTEKT CORPORATION
    Inventors: Kazuhiro Tsujimura, Tomokazu Takayama, Takahito Umeki, Masanori Ando, Hiroyuki Tsusaka