Patents Assigned to JTEKT
  • Patent number: 8657502
    Abstract: An inner ring of a wheel bearing device has a ring mounting surface on which a pulsar ring for detecting a rotation speed of an axle is mounted and first and second inner raceway surfaces which are arranged along an axis of the axle and on which rolling elements roll. The inner ring includes a first inner ring member that has the first inner raceway surface and the ring mounting surface and a second inner ring member that has the second inner raceway surface and a portion that is spaced apart in an axial direction from the second inner raceway surface toward one side at a distance that is longer than or equal to a distance in the axial direction between the first inner raceway surface and the ring mounting surface. A diameter of the portion is smaller than a diameter of the ring mounting surface.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: February 25, 2014
    Assignee: JTEKT Corporation
    Inventors: Shigeaki Furusawa, Yutaka Koma, Shinichi Okubo
  • Patent number: 8651227
    Abstract: A motor control device and an electric power steering system that make it possible to suppress occurrence of voltage saturation with a simple configuration are provided. A current limiting value computing unit computes a current limiting basic value of which the value is lower as a rotation angular velocity of a motor increases, and computes a voltage gain of which the value is smaller as a power voltage value, detected by a first voltage sensor provided at an electric power line that constitutes an electric power supply line to the motor, decreases. In addition, the current limiting value computing unit computes a difference between a control voltage value, detected by a second voltage sensor provided at a control line independent of the electric power line, and the above power voltage value, and computes an output gain of which the value is smaller as the difference increases.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: February 18, 2014
    Assignee: JTEKT Corporation
    Inventors: Yoji Taniguchi, Takumi Ito
  • Patent number: 8651997
    Abstract: In a planetary gear device, a first side plate as carrier is formed to a disc plate shape and secures thereto pins to protrude the pins from one end surface in an axial direction. The outside diameter of the first side plate is formed to be a small diameter on one side in the axial direction and a large diameter on the other side in the axial direction. The first side plate is provided with press-fitting hole portions with the pins press-fitted thereinto and small-diameter side concavities that are formed on the press-fitting hole portions on one side in the axial direction, that open to one end surface in the axial direction of the first side plate and that have internal surfaces being out of contact with the pins at at least parts thereof.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: February 18, 2014
    Assignee: JTEKT Corporation
    Inventors: Yoshinobu Katoh, Hiromichi Ota
  • Patent number: 8651526
    Abstract: In a steering apparatus, an upper bracket that supports a steering column is configured as a breakaway bracket, and has a telescopic adjustment function that allows the steering wheel position to be adjusted in the axial direction of the steering column. The upper bracket has a first through-hole extending through the upper bracket in the axial direction. The upper bracket is provided with a guide rail 7 that has a fixed portion and a body portion. The fixed portion is fixed to a mounting stay. The body portion extends from the fixed portion toward the front of a vehicle in the axial direction, and is inserted in the first through-hole.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: February 18, 2014
    Assignees: JTEKT Corporation, Fuji Kiko Co., Ltd.
    Inventors: Yasuhiro Nakamura, Keiji Kishimoto, Kazuyuki Tamenaga, Takeshi Matsuda, Hiroji Nagano, Kazuyoshi Wakabayashi, Shigeru Hoshino, Tomokazu Fujita
  • Publication number: 20140045636
    Abstract: A second shaft is configured by a shaft portion extending outside a housing in which a nutation gear mechanism is housed, a housing portion, and a cylindrical portion. A communicating hole, through which an outside and an inside of the housing portion communicate with each other, is formed in the shaft portion. A preload applying mechanism includes a preload adjusting plug that is screwed to the housing portion and is able to be operated from outside through the communicating hole, a wave washer compressed in accordance with a position of the preload adjusting plug, and a lock nut that is screwed to the housing portion of the second shaft so as to press the preload adjusting plug toward the nutation gear mechanism.
    Type: Application
    Filed: July 31, 2013
    Publication date: February 13, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Hitoshi SASAKI, Satoshi MOTOYAMA, Tomonari YAMAKAWA, Masanori NATSUME
  • Publication number: 20140045633
    Abstract: Adjacent chain elements transmit a tension by allowing two pins to contact each other. When a chain which has been in a linear state starts to bend, a contact point moves from one point to another. Such movement of the contact point generates a force couple. This force couple causes the rear end of the chain element to move in a lifted manner. An increasing rate of this amount of movement with respect to a relative angle to an adjacent chain element is set such that the increasing rate is small when the relative angle is small, and becomes larger when the relative angle becomes larger.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 13, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Teruhiko NAKAZAWA, Shinji YASUHARA, Taizou WAKAYAMA
  • Publication number: 20140041771
    Abstract: An annular workplace quenching method includes: cooling an annular workpiece with an inner die arranged radially inward of the workpiece heated at a quenching temperature; pressing the workpiece in a width direction at a low pressure and inserting the workpiece in an outer die with restraint of an inner peripheral surface of the workpiece continued, when the restraint is started by contact with the inner die, after a temperature of the workpiece is decreased to 500° C. or lower but before the temperature is decreased to a martensitic transformation start temperature (Ms point); and restraining the workpiece in the width direction by pressing the workpiece in the width direction at a high pressure, and restraining an outer peripheral surface of the workpiece that undergoes volume expansion due to martensitic transformation, using the outer die, after the temperature of the workpiece is decreased to the Ms point or lower.
    Type: Application
    Filed: August 1, 2013
    Publication date: February 13, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Tetsurou HIRANO, Atsushi KUNO
  • Publication number: 20140041468
    Abstract: An electric actuator includes: an electric motor that includes an output shaft and generates a rotational driving force; shift and select conversion mechanisms that transmit the rotational driving force to a shift select shaft; a transmission shaft that transmits the rotational driving force to the shift and select conversion mechanisms; and a coupling that is provided coaxially with the output shaft and the transmission shaft and connects the output shaft to the transmission shaft so that the output shaft and the transmission shaft are rotatable together. The electric actuator includes a resolver that detects a rotation angle of the output shaft, with regard to the electric motor. A resolver rotor of the resolver is fitted to an outer periphery of a transmission shaft-side cylindrical portion of the coupling.
    Type: Application
    Filed: July 31, 2013
    Publication date: February 13, 2014
    Applicant: JTEKT CORPORATION
    Inventor: Yasuhiro YUKITAKE
  • Patent number: 8646983
    Abstract: A rolling bearing includes: a first raceway member; a second raceway member; rolling elements; a guide member; and a cage. The guide member is formed integrally with or separately from the second raceway surface, and includes: an annular guide surface arranged at a position different from a second raceway surface of the second raceway member in an axial direction; a flow path in which compressed air for supplying lubricating oil flows; and an annular groove provided in the guide surface in a circumferential direction. The annular groove has: a discharge opening connected to the flow path in a groove bottom part; and an introducing surface configured to introduce the compressed air toward the second raceway member in the axial direction. The annular cage holds the rolling elements and has a guided surface opposing the guide surface such that the guided surface can slidably contact the guide surface.
    Type: Grant
    Filed: October 2, 2009
    Date of Patent: February 11, 2014
    Assignee: JTEKT Corporation
    Inventors: Yuichiro Hayashi, Takeshi Yamamoto
  • Patent number: 8648340
    Abstract: A FET for driving an electric motor includes a source electrode. The source electrode has main electrode surfaces to which bonding wires, through which a drive current for an electric motor passes, are joined, and inspection electrode surfaces that are arranged so as to be independent of and apart from the main electrode surfaces. The inspection electrode surfaces are provided so as to contact a probe of an inspection device that performs an inspection of the FET 3.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: February 11, 2014
    Assignee: JTEKT Corporation
    Inventors: Tomoya Noda, Shigeki Nagase
  • Publication number: 20140033860
    Abstract: A rolling bearing of a balancer shaft device is positioned on an imaginary circle concentric with an axis of a shaft portion of a balancer shaft as viewed in a radial cross-section, and includes a cylindrical portion which covers the shaft portion. An outer circumferential surface of the cylindrical portion defines an inner ring raceway surface of an inner ring member on which a rolling element of the rolling bearing rolls. A part of the shaft portion of the balancer shaft, at a position on which the rolling bearing is disposed, has a cutout formed at a portion which does not contribute to offsetting of rotational vibration of a crankshaft.
    Type: Application
    Filed: April 19, 2012
    Publication date: February 6, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Yoshitaka Waseda, Kenichi Nakaoka, Motoichi Murakami, Kenichi Harada
  • Publication number: 20140034440
    Abstract: A magnetic path forming member is formed by heating a radially intermediate portion of a workpiece made of a magnetic material to melt the radially intermediate portion from one axial face of the workpiece to the other axial face of the workpiece to form a keyhole, and disposing an alloy element in a molten pool around the keyhole to demagnetize a melted portion.
    Type: Application
    Filed: July 22, 2013
    Publication date: February 6, 2014
    Applicant: JTEKT Corporation
    Inventor: Takaya NAGAHAMA
  • Publication number: 20140035349
    Abstract: A hub unit of the present invention includes a cap that covers an opening of a pilot portion, and the cap includes a cap body formed in a disc shape, and a cylindrical portion extending in an axial direction from an outer periphery of the cap body. The cap is removably attached to the pilot portion by screwing an external thread portion formed on an outer periphery of the cylindrical portion of the cap, to an internal thread portion formed on an inner periphery of the pilot portion.
    Type: Application
    Filed: July 19, 2013
    Publication date: February 6, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Katsuyuki HARADA, Shuji MAEDA
  • Publication number: 20140037472
    Abstract: An electrical pump apparatus is provided in which a situation where a failure detection circuit becomes inoperative before detection of a failure of an electric system can be avoided, and the certainty of failure detection can be enhanced. An attaching portion which is to be attached to a vehicle body is formed so that, in a state where an electrical pump apparatus is attached to the vehicle body, a circuit board of a control device is perpendicular to the horizontal direction. A control IC chip which constitutes a microcomputer for detecting a failure of the electric system is placed on a circuit board so as to be higher in the direction of gravity from a lowest water level Hmin at which flooding in a housing causes the electric system to be short-circuited.
    Type: Application
    Filed: January 4, 2012
    Publication date: February 6, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Tsutomu Hibi, Fukami Imai
  • Publication number: 20140033830
    Abstract: A grinding abnormality monitoring method and device for grinding a plurality of works of the same type are proposed which can improve the accuracy of judgment whether an abnormality is generated or not by properly setting a threshold value. According to the method or the device, by setting at least one of upper and lower limit values of a trial grinding load detected at the trial grinding of at least one of the works, an occurrence of grinding abnormality is judged when an actual grinding load detected at the actual grinding of work exceeds at least one of the upper and lower limit values thereof which varies depending on the time elapsed from the start of the actual grinding or a position of work relative to a grinding wheel.
    Type: Application
    Filed: December 22, 2011
    Publication date: February 6, 2014
    Applicant: JTEKT Corporation
    Inventors: Tomoyuki Kasuga, Atsushi Saito, Takayuki Yoshimi, Masao Ikeda
  • Patent number: 8641290
    Abstract: A tapered roller bearing according to the present invention, in which the rolling surface of a tapered roller and raceway surfaces of internal and outer rings undergoes crowning. The total crowning amount of that crowning and the crowning amount of each raceway surface and rolling surface are set to preferred values. This allows reduction of the rolling friction of the internal and outer rings and the tapered roller, and the rotation torque of the tapered roller bearing according to the present invention.
    Type: Grant
    Filed: February 21, 2005
    Date of Patent: February 4, 2014
    Assignee: JTEKT Corporation
    Inventors: Koji Kawaguchi, Yuzuru Takahashi, Kiyoshi Ogino, Hiroki Matsuyama
  • Patent number: 8640341
    Abstract: A method of producing a rolling sliding member, wherein, after a work for a rolling sliding member, which is made of a bearing steel and formed in a predetermined shape, is quenched, a heating start temperature is set to be 10 to 100° C., a heating finish temperature is set to be 220 to 350° C., a time between the heating finish time and the heating start time is set to be a heating time, the quenched work for the rolling sliding member is heated so that a rate of temperature increase indicated by the following formula becomes 7 to 35° C./s rate of temperature increase=(heating finish temperature?heating start temperature)/heating time, the work is tempered by being cooled without being maintained at a heating finish temperature from the heating finish time.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: February 4, 2014
    Assignee: JTEKT Corporation
    Inventors: Towako Matsui, Katsuhiko Kizawa
  • Patent number: 8641575
    Abstract: A driving force transmission apparatus includes: a front housing and an inner shaft coaxially with each other and rotatable relative to each other; a main clutch transmitting torque between the front housing and the inner shaft; and a cam mechanism having a main cam and a pilot cam and using the main cam to press the main clutch. Where a circumferential gap angle between each spline tooth of the front housing and a corresponding first protrusion of outer clutch plates is ?1, a circumferential gap angle between each spline tooth of the inner shaft and a corresponding protrusion of inner clutch plates is ?2 and a circumferential gap angle between each spline tooth of the inner shaft and a corresponding protrusion of the main cam is ?3, the inequality ?1+?2??3?1.0° is satisfied.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: February 4, 2014
    Assignee: JTEKT Corporation
    Inventor: Naoyuki Kokubo
  • Publication number: 20140027196
    Abstract: An electric power steering apparatus transmits rotational force of a motor to a rack shaft via a driver pulley, a belt, a driven pulley, and a ball nut. A ball bearing and the driven pulley are fitted to the outer circumferential surface of the ball nut. Also, the ball nut is rotationally supported to the inner circumferential surface of a housing via the ball bearing. A female thread portion is formed on the inner circumferential surface of the driven pulley. The ball nut has a male thread portion formed in a first end and a flange formed in a second end. By fastening the male thread portion and the female thread portion to each other, the ball bearing is clamped between the flange and the driven pulley, while the ball nut and the driven pulley are fastened to each other.
    Type: Application
    Filed: April 22, 2013
    Publication date: January 30, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Tetsuya KANEKO, Toshihiro ASAKURA, Yuichi YAMANAKA
  • Publication number: 20140029884
    Abstract: A wave washer is used for a shaft supporting device of an electric power steering system. The wave washer has an annular portion and six outward protrusions. The annular portion has first protrusions that protrude in a first axial direction and second protrusions that are formed so as to continuous with the first protrusions and that protrude in a second axial direction. Each outward protrusion protrudes from an outer periphery of the annular portion in a radially outward direction of the radial direction of the annular portion.
    Type: Application
    Filed: July 19, 2013
    Publication date: January 30, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Yuichi TOYAMA, Hiroyuki TAKAHASHI, Kosuke TSUKAHARA, Fumihiro KAWAKAMI, Tomohiro NIWA, Yoshinobu MURAMOTO, Naoki KINOUCHI, Takaya TANIKAWA