Patents Assigned to JTEKT
  • Patent number: 8591203
    Abstract: In a pump apparatus having a reduction chamber for reducing pulsation of a hydraulic fluid pressurized in a pump section on the way of a discharge channel having an opening in the outer surface of the housing of the pump section, a remaining fluid inflow prevention pipe having one end fitted into and fixed to the discharge channel between the outer surface and the reduction chamber and the other end positioned in the reduction chamber is provided, and a seal lip for fluid-tightly sealing the space between the inner wall of the discharge channel and the one end is provided on the outer circumference of the one end. The seal lip is formed in a shape tapered toward the discharge side. Further, the outside diameter of the other end of the remaining fluid inflow prevention pipe is made larger than the inside diameter of the discharge channel.
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: November 26, 2013
    Assignee: JTEKT Corporation
    Inventors: Yoshihito Yoshihara, Yoshiaki Hamasaki, Takashi Taniwa, Katsutake Asano
  • Patent number: 8593084
    Abstract: An auxiliary power supply device that can always supply stable auxiliary power at the time of using an auxiliary power source and an electric power steering device employing the auxiliary power supply device are provided. In the auxiliary power supply device including a discharge circuit selectively constituting a state where a motor is supplied with power from only a battery and a state where the motor is supplied with power from a power source in which an auxiliary power source is connected in series to the battery by PWM control, when the power consumption of the battery is greater than an upper limit, a control circuit is provided which controls the power consumption to return to the upper limit by performing an electric power feedback control using a duty as an amount of operation at the time of turning on and off switching elements by a PWM control on the basis of the difference.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: November 26, 2013
    Assignee: JTEKT Corporation
    Inventor: Toshiaki Oya
  • Publication number: 20130308891
    Abstract: A cage used in a large-size rolling bearing is formed of a plurality of cage segments having a circular-arc shape and arranged in a circular pattern. Each cage segment includes rims opposed to each other and separated from each other at a predetermined interval, and a plurality of cage bars that extend from one of the rims to the other rim and that define pockets which accommodate the rollers and which are arranged in the circumferential direction. Multiple pairs of hook portions, between which the inner ring is sandwiched, are formed so as to project from the rims, and are arranged at predetermined intervals in the circumferential direction. Distal ends of the hook portions are engaged with annular grooves formed in end portions of the inner ring so as be rotatable relative to the inner ring.
    Type: Application
    Filed: May 14, 2013
    Publication date: November 21, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Hideki FUJIWARA
  • Publication number: 20130305871
    Abstract: A steering system includes a steering column which supports rotatably a steering shaft to which a steering wheel is connected and a pair of support mechanisms which support the steering column so as to tilt relative to a vehicle body. Each of the support mechanisms includes a support bracket having a column-side fastened portion and a body-side fastened portion, a fulcrum bolt, and a bush. A fastening hole through which a fastening bolt is inserted to fasten the support bracket to a fixed member is formed in the body-side fastened portion. Each of the support mechanisms includes an elastic member which can be compressed in an axial direction of the fulcrum bolt, and the support bracket is configured to oscillate relative to the steering column by the elastic member being compressed.
    Type: Application
    Filed: January 6, 2012
    Publication date: November 21, 2013
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, JTEKT CORPORATION
    Inventors: Yoshihide Ohara, Tatsuhiro Yamamoto, Hiroshi Kawakami, Toru Suzuzki
  • Publication number: 20130306396
    Abstract: A steering system includes a rack housing and a drainage device. The drainage device has a drainage case, and a drainage valve made of a resin. The drainage case has a case inlet port communicated with a housing space of the rack housing, case outlet ports communicated with the outside of the rack housing, a drainage space communicated with the case inlet port and the ease outlet ports, and a convex portion. The drainage valve has a valve body inlet port portion, and a ‘valve body outlet port portion that interrupts communication between the case inlet port and the case outlet ports when the valve body outlet port portion comes into contact with the convex portion.
    Type: Application
    Filed: May 10, 2013
    Publication date: November 21, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Hirokazu TOJO
  • Publication number: 20130308885
    Abstract: A split cage for a rolling bearing includes a plurality of cage segments formed of synthetic resin and arranged annularly in a circumferential direction. Each cage segment includes: a first rim portion and a second rim portion that are spaced from each other by a predetermined interval and face each other; and a plurality of bar portions extending from the first rim portion to the second rim portion. Spaces, each of which is surrounded by the bar portions adjacent to each other and the first and second rim portions, are formed as pockets that house rolling elements. Projections for reinforcement are formed at radial end portions of boundaries between the bar portions and the first rim portion and/or boundaries between the bar portions and the second rim portion.
    Type: Application
    Filed: May 17, 2013
    Publication date: November 21, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Takeshi MIYACHI
  • Publication number: 20130309101
    Abstract: An electric pump device of an aspect of the invention includes a state determination unit and a gain adjusting unit. The state determination unit determines whether or not the electric pump device is in a stable state where a required oil pressure is supplied to a hydraulic operating device by maintaining a rotation state of a motor. The gain adjusting unit adjusts a gain for a current feedback control so as to reduce responsiveness of the current feedback control when the state determination unit determines that the electric pump device is in the stable state.
    Type: Application
    Filed: January 25, 2012
    Publication date: November 21, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Kengo Uda
  • Publication number: 20130311044
    Abstract: An assisting command value calculating unit calculates a first assisting factor on the basis of the value of a torque differential control volume added to a basic assist control volume based on a steering torque value, while increasing or decreasing, on the basis of an assisting gradient, the torque differential control volume based on a torque differential value. The pinion angle F/B control unit calculates a pinion angle command value, capable of being converted to a steering angle of the steering wheel, on the basis of the steering torque and the first assisting factor, and executes rotational angle feedback control. The assisting command value calculating unit calculates an assisting command value on the basis of the value of a second assisting factor, calculated by the pinion angle F/B control unit, added to the first assisting factor.
    Type: Application
    Filed: March 28, 2012
    Publication date: November 21, 2013
    Applicant: JTEKT CORPORATION
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita, Isao Namikawa
  • Patent number: 8584791
    Abstract: A hydraulic power steering apparatus assists in steering of a vehicle with a hydraulic cylinder. The hydraulic power steering apparatus includes a flow control valve, a steering torque sensor, a steering angle sensor, a vehicle speed sensor, and an ECU. The flow control valve changes the supply/drainage amount of hydraulic fluid for the hydraulic cylinder. The ECU sets a supply/drainage mode for supplying/draining the hydraulic fluid with respect to the hydraulic cylinder based on detection results from the aforementioned sensors and controls the flow control valve in accordance with the supply/drainage mode of the hydraulic fluid.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: November 19, 2013
    Assignee: JTEKT Corporation
    Inventors: Masahiko Sakamaki, Yasuhiro Tomagou, Akihiko Shiina, Tetsuya Ozaki, Ryouichi Kubo
  • Patent number: 8587296
    Abstract: Three magnetic sensors are arranged around a rotor at predetermined angular intervals about the rotation axis of the rotor. Sinusoidal signals having a phase difference of 120° are output from the magnetic sensors. A rotation angle computing device detects a magnetic pole transition in a first output signal as follows. The rotation angle computing device detects a magnetic pole transition in the first output signal based on a current value of one of the second and third sinusoidal signals, an absolute value of a difference between an immediately preceding value and the current value of the one of the second and third sinusoidal signals being larger than an absolute value of a difference between an immediately preceding value and the current value of the other of the second and third sinusoidal signals, 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: November 19, 2013
    Assignee: JTEKT Corporation
    Inventor: Takeshi Ueda
  • Patent number: 8585296
    Abstract: An axial lip is formed on a side surface of a seal of a rolling bearing which faces a slinger so as to expand outwards of the bearing. A projecting portion is formed on a flat surface of the slinger which faces the seal by flexing the slinger in an axial direction so as to cause the slinger to project inwards of the bearing, and a distal end of the axial lip is brought into contact with the flat surface of the slinger in a position lying further radially outwards than the projecting portion on the slinger. A radially inward inner surface of the axial lip of the axial lip and a radially outer side sloping surface formed radially outwards of the projecting portion on the slinger form a labyrinth, and a portion of the side surface of the seal which lies further radially inwards than the position where the axial lip is formed and an apex portion of the projecting portion on the slinger form a labyrinth.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: November 19, 2013
    Assignee: JTEKT Corporation
    Inventors: Kunihiro Yamaguchi, Youichi Numada, Ikuo Ito
  • Patent number: 8588975
    Abstract: It is determined whether the first tool identification information that is output from a robot control device, and that indicates a present tool and the second tool identification information for detecting and identifying a tool attached to the robot are unequal to each other. The position coordinates of the taught reference point in an actual space of the robot occurring at the time when the unequalness therebetween is first detected are set as reference coordinates, and a region that contains the reference coordinates is set as a predetermined region. If the position coordinates of the taught reference point have come to exist outside the predetermined region during a period during which it is determined that the foregoing two pieces of information are unequal, an emergency stop signal for causing the robot to be in a safe state is output.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: November 19, 2013
    Assignee: JTEKT Corporation
    Inventors: Katsuhiro Komuro, Toshio Aono
  • Publication number: 20130301970
    Abstract: A wheel rolling bearing unit capable of preventing grease leak even if the interference of the sealing member for sealing the clearance between the inner and outer rings is made small. The wheel rolling bearing unit according to the present invention is equipped with an inner shaft; an outer ring disposed concentrically on the outer peripheral side of the inner shaft; a plurality of balls disposed between these; and a pair of cages for retaining the balls in the circumferential direction. On the inner peripheral surface of each of the pair of cages, a concave section being dented to the outside in the radial direction to hold grease is formed in the range from the axial outside end section to the inside end section.
    Type: Application
    Filed: February 9, 2012
    Publication date: November 14, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Kouji Kawaguchi
  • Publication number: 20130304309
    Abstract: A driving force distribution control device controls an inductive load circuit to adjust a ratio of driving forces transmitted from a driving source to a plurality of wheels via a driving force transmitting system. The driving force distribution control device counts a number of tests performed by applying a test current to the inductive load circuit; determines that a disconnecting abnormality occurs in an electric load including the inductive load circuit if a difference between a value of the test current and a value of current flowing in the inductive load circuit is greater than a current difference threshold value; and determines that the disconnecting abnormality is definitive if the number of tests is equal to a threshold value or more, and also if the number of determinations of the disconnecting abnormality is equal to a predetermined threshold value or more.
    Type: Application
    Filed: January 26, 2012
    Publication date: November 14, 2013
    Applicant: JTEKT CORPORATION
    Inventors: Akiyoshi Kakita, Toshio Ohta, Kiyoshige Kato, Hisaaki Wakao
  • Publication number: 20130304325
    Abstract: A motor control device has characteristic information that indicates a correlation between a rotation speed and a current of a motor. The motor control device sets a rotation speed characteristic value that is a reference value of the rotation speed of the motor and a current characteristic value that is a reference value of the current of the motor on the basis of the characteristic information. The motor control device calculates an estimated rotation speed on the basis of a measured value of a voltage that is applied to the motor, a measured value of the current, the current characteristic value, a voltage characteristic value, the rotation speed characteristic value and a counter-electromotive force constant.
    Type: Application
    Filed: April 22, 2013
    Publication date: November 14, 2013
    Applicant: JTEKT Corporation
    Inventor: Yuji KARIATSUMARI
  • Publication number: 20130298718
    Abstract: First and second lower support mechanisms (27, 28): are each provided with a coil spring (66, 86) that is mated to the outer periphery of an axle part (59, 79) of a fulcrum bolt (53, 73); and are configured in such a manner that support brackets (51, 71) are able to rock with respect to a steering column (5) by compressing the coil springs (66, 86). The coil springs (66, 86) are formed in such a manner that the axle parts (59, 79) are force fitted in a state prior to column-side fastening parts (55, 75) being fastened to the steering column (5).
    Type: Application
    Filed: January 6, 2012
    Publication date: November 14, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Yoshihide Ohara
  • Publication number: 20130301968
    Abstract: A hub spindle bearing unit for the wheel is equipped with an inner ring having inner ring raceway surfaces formed on the outer peripheral surface of the shaft section itself of the hub spindle or an inner ring forming annular member formed separately from the shaft section, an outer ring member having outer ring raceway surfaces formed corresponding to the inner ring raceway surfaces, and balls rotatably disposed between the inner and outer rings, a groove section configured as a fragile section in which the strength against the shaft bending direction load exerted to the hub spindle is weaker than the strength of the hub spindle is formed in the outer ring member, and the groove section is deformed and broken earlier than the hub spindle when an excessive shaft bending direction load exceeding a load to be input during ordinary use is input to the hub spindle.
    Type: Application
    Filed: February 9, 2012
    Publication date: November 14, 2013
    Applicant: JTEKT CORPORATION
    Inventors: Tatsuki Mori, Arihiro Fujiwara
  • Publication number: 20130298680
    Abstract: In a method of inspecting a wheel hub unit configured by attaching a rolling bearing. Which has an inner ring and an outer ring, to a hub wheel, an acoustic inspection dement is arranged so as to be in contact with an outer peripheral face of the outer ring, and the wheel hub unit (components except the outer ring) is rotated to measure an acoustic value of the outer ring and hence conduct inspection. When the wheel hub unit (components except the outer ring) is rotated, a preloading load that is equal to or higher than a load at which an axial internal clearance of the rolling bearing is a negative clearance is applied to the rolling bearing, and the axial internal clearance of the rolling bearing A is changed from a positive clearance before application of the load to a negative clearance after application of the load.
    Type: Application
    Filed: April 22, 2013
    Publication date: November 14, 2013
    Applicant: JTEKT Corporation
    Inventors: Shigeru INOUE, Kenjiro MATSUMURA, Masaki YUKAWA
  • Patent number: 8579676
    Abstract: A first angular grinding wheel and a straight grinding wheel having rotation axes parallel to each other are arranged on a swivel slide that turns about a turning axis. A reference symmetry plane (MA) that is parallel to a grinding wheel rotation axis and that includes the turning axis and a reference perpendicular plane (MB) that is perpendicular to the reference symmetry plane and that includes the turning axis are defined. A grinding reference point (PA1) of the first angular grinding wheel (TA1) and a grinding reference point (PP1) of the straight grinding wheel (TP1) are arranged asymmetrical with respect to the reference symmetry plane. A distance from the grinding reference point of the straight grinding wheel to the reference symmetry plane is equal to a distance from the grinding reference point of the first angular grinding wheel to the turning axis.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: November 12, 2013
    Assignee: JTEKT Corporation
    Inventors: Kikutoshi Okada, Shinji Deguchi, Dai Kiyota
  • Publication number: 20130292201
    Abstract: Provided is a vehicle steering system that is able to restrict a travel amount of a steered shaft in a housing, that is small and that has an excellent strength. The vehicle steering system is a steer-by-wire vehicle steering system that converts rotative power of electric motors into a movement of a steered shaft in an axial direction via a ball screw mechanism. One of contact portions at respective ends of a screw shaft at an intermediate part of the steered shaft passes through a rotor based on a moving direction of the steered shaft so as to contact a corresponding one of the corresponding stoppers thereby restricting a travel amount of the steered shaft. The stoppers are made of a material different from that of the housing and having a high strength.
    Type: Application
    Filed: February 2, 2012
    Publication date: November 7, 2013
    Applicant: JTEKT CORPORATION
    Inventor: Kosuke Yamanaka