Patents Assigned to JTEKT
  • Transmission device
    Patent number: 8770053
    Abstract: A transmission has a simple structure and can be produced at a low cost. A second electromagnetic clutch is shut off at a timing when an electric motor is decelerated and before selecting motion is finished, and thereafter, a shift/select shaft is moved to a terminal end position of the selecting motion with an inertia of a driven part (a second output hub) of the second electromagnetic clutch. At a timing after a predetermined period has passed from the timing, a first electromagnetic clutch for the next shifting motion is connected. The electric motor is driven synchronously with the end of the selecting motion or immediately in response to the end, thereby to start the next shifting motion. In this manner, gear change can be rapidly conducted.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventor: Takafumi Uemoto
  • Electric power steering system
    Patent number: 8770335
    Abstract: Assist force that assists an operation of a steering system of a vehicle is applied to a rack shaft by transmitting driving force of a motor to the rack shaft via a motor shaft and a ball screw nut. A step is formed on the outer periphery of the ball screw nut. An end portion of a third housing is arranged to face a bearing such that the distance that the ball screw nut is able to move relative to the motor shaft in axial direction and the relative movable length is longer than a predetermined length.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventors: Toshihiro Asakura, Takuya Nakayama, Tetsuya Kaneko
  • Vehicle steering system
    Patent number: 8775028
    Abstract: In normal times, a rotation angle restriction mechanism in a first state restricts a rotation angle of a steering member within a first rotation angular range. In the event of a failure, that is, when there is a malfunction in a steering angle sensor, the rotation angle restriction mechanism is switched into a second state by an electromagnetic clutch, and the rotation angle of the steering member is restricted within a second rotation angular range. A steering direction is detected on the basis of at which one of a pair of terminal ends of the second rotation angular range, the steering member is located. An ECU executes drive control on a steering system actuator on the basis of the detected steering direction.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventor: Takashi Tashiro
  • Motor control unit and electric power steering system
    Patent number: 8773057
    Abstract: An ECU that controls a motor includes: a target current value setting unit setting a target current; a voltage detecting unit detecting a detected voltage on the basis of a detection signal from a voltage sensor; a voltage calculation unit calculating an estimated voltage on the basis of a power supply voltage of a battery; and an induced voltage observer calculating an induced voltage generated at the motor using an inter-terminal voltage based on the estimated voltage when the target current is set to a value other than zero; whereas the induced voltage observer calculates the induced voltage using an inter-terminal voltage based on the detected voltage when the target current is set to zero.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventor: Yuji Kariatsumari
  • Wheel rolling bearing apparatus
    Patent number: 8770851
    Abstract: To provide a wheel rolling bearing apparatus which can reinforce a proximal end portion of a first flange portion of an outer race member effectively. A first flange portion (21) is provided on an upper portion side of an outer circumference of an outer race member (11). A first reinforcement portion (26) is provided which connects a proximal end portion (21b) of the first flange portion (21) with the outer circumferential surface (11c) of the outer race member (11). The first flange portion (21) is reinforced by the first reinforcement portion (26) by connecting the proximal end portion of the first flange portion (21) with the outer circumferential surface (11c) by a convexly curved surface.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventor: Takaaki Onizuka
  • Wheel bearing device
    Patent number: 8770852
    Abstract: A wheel bearing device includes an inner shaft and an inner ring member fitted onto an outer periphery of an axially-inner end portion of the inner shaft. A shaft portion coupled to the inner shaft so as to be rotatable together with the inner shaft is inserted in a center hole of the inner shaft. Spline grooves spline-fitted to spline teeth formed on an outer periphery of the shaft portion are formed in an inner periphery of the inner shaft, which defines the center hole. An annular clearance that suppresses reduction in a diameter of the inner shaft due to fitting of the inner ring member onto the inner shaft is formed between the inner ring member and the axially-inner end portion of the inner shaft, within a range where an axial range in which the spline teeth are formed overlaps with an axial range of the inner ring member.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventor: Masao Takimoto
  • Electric power steering system
    Patent number: 8775027
    Abstract: An electric power steering system includes a motor control device that controls, based on an assist command value, driving of a motor that gives an assist torque to a steering mechanism. The motor control device computes a first assist component based on a steering torque and a vehicle speed. A steered-angle command value is computed based on the steering torque and the first assist component, and a second assist component is computed by performing a feedback control that matches the steered angle with the steered-angle command value. The motor control device adds the second assist component to the first assist component so as to compute an assist command value. The motor control device includes a road information compensation portion that decreases an absolute value of the second assist component included in the assist command value when a skid is detected by a vehicle state detecting portion.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: July 8, 2014
    Assignee: JTEKT Corporation
    Inventors: Terutaka Tamaizumi, Hirozumi Eki, Masayuki Kita, Isao Namikawa
  • CLUTCH PLATE
    Publication number: 20140182995
    Abstract: In a clutch plate of an annular shape and a wet type, a plurality of lubrication grooves each taking a U-shape in cross-section are formed on a friction engaging surface on at least one end side. The groove is provided with a groove forming portion crossing the circumferential direction and blunt portions extending along both sides of the groove forming portion and connecting the friction engaging surface with the groove forming portion. Where a straight line passing across one side end of the groove and extending in a radial direction is assumed as a virtual straight line, in a section of the groove taken along a plane that is orthogonal to the virtual straight line and that includes the one side end, the width of the blunt portion on one side is in a range of 0.12 to 0.35 mm, and the depth of the blunt portion is in a range of 25 to 50 ?m.
    Type: Application
    Filed: August 24, 2012
    Publication date: July 3, 2014
    Applicant: JTEKT Corporation
    Inventors: Junji Ando, Kunihiko Suzuki, Kazutaka Matsukawa, Hiroyuki Ando, Takuya Tsuda
  • LIQUID-LUBRICATED BEARING AND VEHICLE PINION SHAFT SUPPORT DEVICE
    Publication number: 20140187374
    Abstract: An outer lubricating liquid inflow passage that provides communication between an outside of a liquid-lubricated bearing and a rolling element arrangement chamber is formed between an outer ring and a cage, on the lubricating liquid inflow side. The outer lubricating liquid inflow passage has an annular axially extending outer passage portion that extends in the axial direction, and an annular radially extending outer passage portion. The radially extending outer passage portion communicates with a rolling element-side axial end portion of the axially extending outer passage portion. The radially extending outer passage portion extends from the axially extending outer passage portion to the rolling element arrangement chamber inward in the radial direction of the outer ring. A labyrinth is formed by the axially extending outer passage portion and the radially extending outer passage portion.
    Type: Application
    Filed: December 18, 2013
    Publication date: July 3, 2014
    Applicant: JTEKT CORPORATION
    Inventor: Masayuki MURAKAMI
  • STEERING DEVICE
    Publication number: 20140182410
    Abstract: A steering device includes: a steering shaft; an inner jacket; a column jacket that includes an outer jacket that covers the inner jacket from outside, and supports the steering shaft; a movable bracket that is fixed to the inner jacket; a fixation bracket that has a retention portion, and is fixed to a vehicle body; and a press contact/release portion that brings a first plate-shaped region and a second plate-shaped region into press contact with each other along the plate thickness direction to press the first plate-shaped region and the second plate-shaped region against the retention portion, and releases the first plate-shaped region and the second plate-shaped region from a state of being in press contact with each other and a state of being pressed against the retention portion.
    Type: Application
    Filed: December 20, 2013
    Publication date: July 3, 2014
    Applicant: JTEKT CORPORATION
    Inventor: Toru SAKATA
  • Motor control unit and vehicle steering system
    Patent number: 8766589
    Abstract: In a motor control unit, a current-carrying failure detection unit determines a first determination condition and a second determination condition. The current-carrying failure detection unit measures a duration of a state where the first determination condition is satisfied, and a duration of a state where the second determination condition is satisfied. When the first or second duration exceeds a predetermined reference period, the current-carrying failure detection unit determines that a current-carrying failure has occurred.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: July 1, 2014
    Assignee: JTEKT Corporation
    Inventors: Toshihiro Takahashi, Satoru Mikamo, Hiroshi Kawamura, Jun Hasegawa, Akihiro Tomita, Akira Nambu
  • Vehicle steering system
    Patent number: 8767364
    Abstract: When a short-circuited FET is identified as one of low-side FETs, maximum phase voltages of three phases are detected when a steering operation is performed by a driver, and the detected maximum phase voltages of the three phases are compared with one another to identify a short-circuit phase. On the other hand, when a short-circuited FET is identified as one of high-side FETs, minimum phase voltages of the three phases are detected when a steering operation is performed by the driver, and the detected minimum phase voltages of the three phases are compared with one another to identify a short-circuit phase.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: July 1, 2014
    Assignee: JTEKT Corporation
    Inventor: Shigekazu Okumura
  • Manufacturing method for wheel rolling bearing device, and wheel rolling bearing device
    Patent number: 8763255
    Abstract: An outer ring and rolling elements are fitted to a shaft portion of a shaft member for a wheel rolling bearing device from a shaft end portion of the shaft member, an inner ring and rolling elements are fitted to the shaft portion, and then the shaft end portion is clinched to form a clinched portion to thereby fix the inner ring. At this time, the shaft end portion to be clinched has a solid columnar shape, and a clinching jig is pressed against the shaft end portion, and the clinching jig is oscillated while being pressed in a direction toward one end side of the shaft portion to thereby increase the diameter of the shaft end portion to clinch the shaft end portion.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: July 1, 2014
    Assignee: Jtekt Corporation
    Inventor: Yoshinori Masuda
  • STEERING SYSTEM AND CROSS JOINT
    Publication number: 20140174242
    Abstract: In a steering system that includes: an intermediate shaft on a steering wheel side; a pinion shaft on a steered wheel side; and a cross joint by which the intermediate shaft and the pinion shaft are rotatably connected to each other on a plane intersecting with each of the shafts, and that steers steered wheels by transmitting steering torque of a steering wheel from the intermediate shaft to the pinion shaft, a weakened portion is formed in a joint spider of the cross joint. The weakened portion can be identified in advance as a portion that breaks first. This makes it possible to realize a failure mode in which a vehicle is able to run by itself for a certain period of time after a failure.
    Type: Application
    Filed: August 27, 2012
    Publication date: June 26, 2014
    Applicant: JTEKT CORPORATION
    Inventor: Takeshi Koyama
  • VEHICLE BEARING DEVICE
    Publication number: 20140175862
    Abstract: A hub of a vehicle bearing device has a cylindrical portion and a flange portion. The flange portion has a pin hole formation portion, a reference position intermediate portion, separate position intermediate portions, and build-up portions. The reference position intermediate portion is formed between bolt hole formation portions. The first separate position intermediate portion is formed between bolt hole formation portions. The second separate position intermediate portion is formed between bolt hole formation portions. The pin hole formation portion is formed at the reference position intermediate portion, and has a hub side pin hole. A pin for fixing the hub and a brake rotor to each other is inserted into the hub side pin hole. The build-up portions are formed on the separate position intermediate portions, and are balanced in terms of weight with the pin-hole formation portion.
    Type: Application
    Filed: November 15, 2013
    Publication date: June 26, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Hiroshi ANNO, Katsuyuki HARADA, Alexander SCHUPP, Josef ALTWECK
  • VANE PUMP
    Publication number: 20140178239
    Abstract: A vane pump includes a housing, a cam ring, a rotor, a plurality of vanes that forms a plurality of pump chambers, a side plate constituting a portion of an intake port, an intermediate plate axially adjacent to the housing and the side plate, and a cover member. A portion of a flow passage, through which a fluid flows, is constituted by a surface of the intermediate plate and at least one of the housing, the side plate, and the cover member, the surface of the intermediate plate being adjacent to the at least one of the housing, the side plate, and the cover member. A through-hole or a recessed portion is formed in the intermediate plate, and the through-hole or the recessed portion of the intermediate plate and the side plate constitute a portion of the intake port.
    Type: Application
    Filed: December 13, 2013
    Publication date: June 26, 2014
    Applicant: JTEKT Corporation
    Inventor: Yuki ASAOKA
  • ELECTRIC POWER STEERING SYSTEM
    Publication number: 20140180544
    Abstract: When a steering speed reaches a steering speed determination threshold, a steering speed gain is set to “0”. As a result, a final basic assist controlled variable becomes “0”, and application of an assist force to a steering system is stopped. Therefore, repetition of so-called reverse assist that is a cause of occurrence of an unintended steering behavior, such as self-excited vibration, is stopped. Accordingly, the steering behavior is improved.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 26, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Hidenori ITAMOTO, Gempei NAKASONE, Takashi MITSUHARA, Makoto IKENO
  • ELECTRICAL POWER STEERING APPARATUS
    Publication number: 20140174844
    Abstract: A motor control circuit includes a power relay, a converter division, a smoothing condenser, a control circuit and a motor drive circuit, and is connected to a battery as high voltage power and to an electrical motor. The battery is connected with a driving battery having the high voltage such as 288V etc. A step down circuit reduces the high voltage to a low voltage such as 36V etc., charges a low voltage charge device and supplies drive power to the motor drive circuit. When the vehicle collision is occurred, the control circuit detects the collision by a value of detected acceleration, a power change relay is turned on to change to the power source from the low voltage charge device after voltage of the smoothing condenser is reduced, thereby connecting the low voltage to the motor drive circuit.
    Type: Application
    Filed: December 9, 2013
    Publication date: June 26, 2014
    Applicant: JTEKT CORPORATION
    Inventor: Motoo NAKAI
  • TORQUE DETECTOR AND STEERING SYSTEM INCLUDING THE TORQUE DETECTOR
    Publication number: 20140174202
    Abstract: A torque detector includes: a magnetic flux collecting unit including a magnetic flux collecting holder formed in an annular shape by resin molding and a magnetic shield formed by bending a metal plate and attached to an outer peripheral face of the magnetic flux collecting holder; and a sensor housing formed integrally with the magnetic flux collecting unit. The magnetic shield has a shield body, a shield end portion, and a bent portion. A second angle formed between an outer side face of the shield end portion and a radial direction is smaller than a first angle formed between an outer peripheral face of the shield body and the radial direction.
    Type: Application
    Filed: December 17, 2013
    Publication date: June 26, 2014
    Applicant: JTEKT CORPORATION
    Inventors: Takahiro YUKIMURA, Akihiro TAKEUCHI, Yoji YAMASHITA, Toshio IIDA, Takeshi OISHI
  • TRANSMISSION RATIO VARIABLE DEVICE
    Publication number: 20140165753
    Abstract: A preload adjusting plug is inserted through a communication hole extending through center portions of a Z1 gear, a Z4 gear, and an inner ring of a nutation gear. A male thread portion is formed at an outer periphery of one end of the preload adjusting plug, and is screwed to a female thread portion formed at an inner periphery of the Z1 gear. A disc-shaped flange portion extending radially outward is formed at the other end of the preload adjusting plug, and axially presses a back face of the Z4 gear through a bearing. The preload adjusting plug applies predetermined preloads to meshing portions in the nutation gear mechanism.
    Type: Application
    Filed: December 9, 2013
    Publication date: June 19, 2014
    Applicant: JTEKT CORPORATION
    Inventor: Satoshi MOTOYAMA