Patents Assigned to JTEKT
  • Patent number: 8714329
    Abstract: An electromagnetic clutch includes a rotating member; an electromagnetic coil that is arranged on a rotational axis of the rotating member and generates electro-magnetic force; an output mechanism that has an armature to which return force in a direction away from the electromagnetic coil is applied by a return spring; a cam mechanism that is juxtaposed along the rotational axis to the output mechanism, and has a control cam that is unable to rotate relative to the rotating member, and a cam follower that is able to roll between the control cam and the armature; and a relative rotation restricting device that is arranged on an axis of the cam mechanism, and that is configured to restrict relative rotation between the armature and the control cam when the electromagnetic coil is in a de-energized state.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: May 6, 2014
    Assignee: JTEKT Corporation
    Inventors: Yoichi Sakamoto, Kenji Korenaga, Minoru Onitake, Hiroshi Takuno, Takashi Hosokawa, Hirotatsu Kitabatake, Hideaki Komada, Hiroaki Ebuchi, Hiroto Hashimoto
  • Patent number: 8714832
    Abstract: A conical roller cage that implements a conical roller bearing that is able to suppress torque and that is able to smoothly supply lubricant to a raceway surface includes: a small-diameter annular portion, a large-diameter annular portion having a bore diameter larger than a bore diameter of the small-diameter annular portion, pillar portions that couple the small-diameter annular portion to the large-diameter annular portion and that are located at intervals from each other in a circumferential direction, roller partition wall portions each radially extending from a radial end face of a corresponding one of the pillar portions, and canopy portions each protruding from a radial end portion of a corresponding one the roller partition wall portions, at an opposite side to a side of the pillar portion, toward both sides in the circumferential direction.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: May 6, 2014
    Assignee: JTEKT Corporation
    Inventors: Isao Usuki, Hiroshi Ueno, Hirosato Nakanishi, Masashi Sakaguchi, Kazuki Hamada, Hironori Hiraoka
  • Patent number: 8714041
    Abstract: A transmission that is able to perform shift operation and select operation using the driving force of a single electric motor is provided. A shift/select actuating device includes: an electric motor; a first conversion mechanism; a second conversion mechanism; and a changing unit that changes a destination, to which the rotational driving force of the electric motor is transmitted, between the first conversion mechanism and the second conversion mechanism. The changing unit includes: a first electromagnetic clutch that transmits the rotational driving force of the electric motor to the first conversion mechanism or interrupts the rotational driving force; and a second electromagnetic clutch that transmits the rotational driving force to the second conversion mechanism or interrupts the rotational driving force.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: May 6, 2014
    Assignee: JTEKT Corporation
    Inventors: Yasuhiro Yukitake, Akiyoshi Tashiro, Hiroki Kagawa, Takafumi Uemoto
  • Patent number: 8716967
    Abstract: A motor control device for controlling a three-phase brushless motor that has a rotor and field coils includes: a load range determining unit that determines a rotor rotation angle range, in which the three-phase brushless motor becomes a load, as a load range when a short-circuit fault occurs in one of a plurality of switching elements. The load range determining unit determines a rotor rotation angle range, in which load current is presumed to flow through a closed circuit formed of the short-circuit switching element and any one of regenerative diodes connected in parallel with the respective normal switching elements when the rotor is rotated in a state where all the switching elements other than the short-circuit switching element are turned off, as the load range.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: May 6, 2014
    Assignee: JTEKT Corporation
    Inventor: Shigekazu Okumura
  • Publication number: 20140116930
    Abstract: In a coolant system, the interior of a reservoir frame storing the coolant discharged from a machine tool is partitioned by a partition member into an outer peripheral coolant tub and a central coolant tub. The partition member is formed with a silt that extends in the depth direction to make the outer peripheral coolant tub communicate with the central coolant tub. A suction port of a pump that feeds the coolant in the central coolant tub to a filtering device is arranged in the central coolant tub. The coolant discharged from the machine tool is supplied to the central coolant tub without passing through the outer peripheral coolant tub. At least a part of the coolant filtered by the filtering device is supplied to the outer peripheral coolant tub without passing through the central coolant tub.
    Type: Application
    Filed: October 29, 2013
    Publication date: May 1, 2014
    Applicants: CNK Co., Ltd., JTEKT Corporation
    Inventors: Nobumitsu HORI, Tetsuaki Wada, Tetsuya Matsumoto, Hiroto Kamei, Shigeyuki Kato
  • Publication number: 20140116792
    Abstract: In a material handling and stair climbing vehicle, when the vehicle is shifted from a state where the wheels with two axles are grounded on a travelling surface to a standing state achieved by the wheels with one axle, a main body portion is turned around support shafts with respect to supporting portions in the two-axle wheel grounded state. Then, an inertial force around the support shafts is generated by reducing the speed of turning of the main body portion with respect to the supporting portions. Then, the vehicle is shifted to the standing state achieved by the wheels with one axle by turning the supporting portions around the axles of the wheels with one axle, which are grounded on the travelling surface, by the inertial force.
    Type: Application
    Filed: October 18, 2013
    Publication date: May 1, 2014
    Applicant: JTEKT Corporation
    Inventors: Takeshi UEDA, Genki Murata
  • Publication number: 20140116798
    Abstract: A circuit board includes control circuit patterns and first drive circuit patterns. A base maintains the circuit board in a state in which the base is opposed to a portion of the circuit board, in which the control circuit patterns are formed, across a space that allows control circuit elements to be mounted at the circuit board. A line module includes second drive circuit patterns electrically connected to the first drive circuit patterns so as to constitute a part of lines of a drive circuit, and is sandwiched between a portion of the circuit board, in which the first drive circuit patterns are formed, and the base.
    Type: Application
    Filed: October 17, 2013
    Publication date: May 1, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Shigeki NAGASE, Motoo NAKAI
  • Publication number: 20140117884
    Abstract: An electric power steering system includes: an electric motor that generates assist torque based on steering torque; an auxiliary power supply connected in series with a main power supply that supplies electric power to the electric motor, and capable of discharging electric power to the electric motor; and a control device that controls a voltage to be applied to the electric motor. When the auxiliary power supply starts discharging electric power to the electric motor, the control device gradually increases a duty ratio of a switching element, which is a command signal for commanding the auxiliary power supply to discharge electric power.
    Type: Application
    Filed: October 21, 2013
    Publication date: May 1, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Toyoki SUGIYAMA, Masayasu HIGASHI
  • Patent number: 8708569
    Abstract: In a wheel rolling bearing device, where a pitch diameter of the inner-row ball set is D1 and a pitch diameter of the outer-row ball set is D2, D1 and D2 are set so as to satisfy the relationship “D1<D2”. Where an angle of a raceway circular arc from an intersection point of each inner-row ball with the inner-side outer ring raceway surface at a contact angle to a boundary portion of an inner-side raceway shoulder is ?1 and an angle of a raceway circular arc from an intersection point of each outer-row ball with the outer-side outer ring raceway surface at a contact angle to a boundary portion of an outer-side raceway shoulder is ?2, ?1 and ?2 are set so as to satisfy the relationship “?1<?2”.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: April 29, 2014
    Assignee: JTEKT Corporation
    Inventor: Tatsuya Yokota
  • Patent number: 8708851
    Abstract: With a view to suppressing fretting in a power transmission chain, when a chain straight-line area is seen from a chain widthwise direction W, a flat portion 18 of a first pin 3 of the chain extends in an inclination direction D. A point of intersection P0 is formed by an imaginary line L1 which passes through a center position of an overall height h of the first pin 3 along the inclination direction D intersecting the flat portion. A point of intersection P2 is formed by an imaginary line L2 which passes through a contact portion A0 and which extends in a chain advancing direction X intersecting the flat portion 18 between the point of intersection P0 and one end P1 of the flat portion. When assuming that a distance between the point of intersection P0 and the point of intersection P2 is referred to as h1 and a distance between the point of intersection P2 and the one end P1 of the flat portion 18 is referred to as h2, 0.1·h1?h2.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: April 29, 2014
    Assignee: JTEKT Corporation
    Inventors: Seiji Tada, Shigeo Kamamoto
  • Patent number: 8712646
    Abstract: A method for determining the absolute angular position of a steering wheel of an electric power-assisted steering column of a motor vehicle, including a means for measuring a dynamic parameter while the vehicle is running and including among others, the steps of periodically determining a multi-turn relative angular position, determining at least one dynamic parameter relating to the running conditions of the vehicle using the means for measuring said parameter, determining an absolute steering-wheel angle calculated according to at least one dynamic parameter, and weighting the calculated value of the absolute steering-wheel angle according to a test of the validity of the calculated value of the absolute steering-wheel angle and the origin of said value, in other words, the measurement means used to determine said at least one dynamic parameter.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: April 29, 2014
    Assignee: JTEKT Europe
    Inventors: André Michelis, Julien Barthomeuf, Pierre Pilaz, Stéphane Bourbon
  • Patent number: 8712576
    Abstract: A controller for a machine tool and a five axis simultaneous control machine tool which can improve machining accuracy in controlling a pivoting axis of the machine tool. The controller including an allowable position error setting member setting an allowable position error between a commanded machining position and an actual machining position; a velocity control parameter deciding member deciding a velocity control parameter of the pivoting axes of the A-axis and the B-axis in accordance with the allowable position error being set and a distance of said actual machining position from the pivoting axes; and a controlling member controlling a velocity of the pivoting axes based on the velocity control parameter.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: April 29, 2014
    Assignee: JTEKT Corporation
    Inventor: Yoshihiko Yamada
  • Patent number: 8710831
    Abstract: Three magnetic sensors are arranged around a rotor at predetermined angular intervals about the rotation axis of the rotor. Sinusoidal signals that have a phase difference of a predetermined degree of 45° are output from the respective magnetic sensors. A rotation angle computing device detects a magnetic pole transition in a first output signal as follows. Specifically, the rotation angle computing device detects a magnetic pole transition in the first output signal based on a value having a larger absolute value between a current value of the second sinusoidal signal and a current value of the third sinusoidal signal, an immediately preceding value of the first sinusoidal signal and a current value of the first sinusoidal signal.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: April 29, 2014
    Assignee: JTEKT Corporation
    Inventors: Takeshi Ueda, Hayato Komatsu
  • Patent number: 8708357
    Abstract: A pinion shaft of a steering system has a plurality of pinion teeth. A rack shaft has a stroke region in which a plurality of rack teeth that mesh with the pinion teeth is formed. The stroke region includes a center region that includes a center position of the stroke region, end regions, each of which includes an end position of the stroke region, and intermediate regions, each of which is located between the center region and one of the end regions. A pressure angle of each rack tooth included in each of the intermediate regions is smaller than a pressure angle of each rack tooth included in each of the center region and the end regions.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: April 29, 2014
    Assignee: JTEKT Corporation
    Inventor: Hidetoshi Sumihara
  • Patent number: 8708089
    Abstract: A vehicle steering apparatus includes an actuator that generates a steering force, and a first speed reduction mechanism connected to the actuator. To the first speed reduction mechanism, a second speed reduction mechanism is connected. To the second speed reduction mechanism, a steering mechanism is connected. A sub-assembly including the actuator and the first speed reduction mechanism is configured.
    Type: Grant
    Filed: July 15, 2009
    Date of Patent: April 29, 2014
    Assignee: Jtekt Corporation
    Inventors: Kouji Kitahata, Shiro Nakano, Masaya Segawa, Yoshiharu Nogami
  • Publication number: 20140114535
    Abstract: In a PID control system, a proportionality coefficient multiplication unit multiplies a valve opening degree command value by a proportionality coefficient. A first angle deviation computation unit computes a deviation between an output value from a proportionality coefficient multiplication unit and a detected rotation angle of a valve driving motor. A differential coefficient multiplication unit multiplies the valve opening degree command value by a differential coefficient. A third angle deviation computation unit computes a deviation between an output value from the differential coefficient multiplication unit and the detected rotation angle of the valve driving motor.
    Type: Application
    Filed: October 16, 2013
    Publication date: April 24, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Hideto OHMAE, Masahiko SAKAMAKI
  • Patent number: 8702314
    Abstract: An inner diameter of a cylindrical portion of a metal core is set to such a value that the cylindrical portion is fitted to an outer ring by interference fit. An inner periphery of an end portion of the cylindrical portion of the metal core is larger in diameter than an inner periphery of a portion of the cylindrical portion, which is fitted to the outer ring. An elastic seal has a cylindrical portion that is in close contact with an outer periphery of the cylindrical portion of the metal core, and a folded-back portion that extends from the cylindrical portion. The folded-back portion is compressively deformed by being sandwiched between the inner periphery of the end portion of the cylindrical portion of the metal core and the outer periphery of an outer ring.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: April 22, 2014
    Assignee: JTEKT Corporation
    Inventor: Masao Takimoto
  • Publication number: 20140105528
    Abstract: A rolling bearing includes: a first raceway member having a first annular raceway surface; a second raceway member having a second annular raceway surface opposing the first raceway surface; a plurality of rolling elements arranged between the first raceway surface and the second raceway surface so as to roll; and a guide member formed integrally with or separately from the second raceway surface. The guide member including: an annular guide surface arranged at a position different form the second raceway surface in an axial direction; a plurality of flow paths which are separately provided in the axial direction and in which compressed air for supplying lubricating oil flows; and discharge openings which spray the compressed air to a guided surface. An annular cage that holds the plurality of rolling elements at given intervals in a circumferential direction and has the guided surface which opposes the guide surface such that the guided surface can slidably contact the guide surface.
    Type: Application
    Filed: December 17, 2013
    Publication date: April 17, 2014
    Applicant: JTEKT Corporation
    Inventors: Yuichiro HAYASHI, Takeshi Yamamoto
  • Publication number: 20140102235
    Abstract: A speed reducer for an electric power steering system includes a worm, a worm wheel, and a housing. Only a meshing section where the worm and the worm wheel mesh with each other and a space between the worm wheel and the housing are filled with grease. The grease in the space is in contact with both tooth surfaces of the worm wheel and an inner peripheral face of the housing, the inner peripheral face facing the worm wheel.
    Type: Application
    Filed: October 4, 2013
    Publication date: April 17, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Yuji WAKUGAWA, Ryuji NAKATA, Atsuhiro YOSHIDA, Wataru YAMADA, Jun HAMAKITA, Hideyuki HONKADO
  • Patent number: 8700280
    Abstract: A road surface frictional coefficient estimation device includes: a first straight travel determination unit configured to determine whether or not a vehicle travels straight based on a rotational speed difference between a plurality of wheels of the vehicle; a second straight travel determination unit configured to determine whether or not the vehicle travels straight based on a steering angle of the vehicle; a selection unit configured to select one of determination results of the first straight travel determination unit and the second straight travel determination unit; and a frictional coefficient estimation unit configured to estimate a frictional coefficient of a road surface on which the vehicle travels when the one of the determination results selected by the selection unit indicates that the vehicle travels straight.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: April 15, 2014
    Assignee: JTEKT Corporation
    Inventors: Tomohiro Nozu, Ryohei Shigeta, Akira Kodama, Go Nagayama, Yasushi Yagi, Daisuke Kofu, Akihiro Tatara