Patents Assigned to JTEKT
  • Hydraulic power steering system
    Patent number: 9038763
    Abstract: A hydraulic power steering system includes: a hydraulic cylinder in which an interior is partitioned into first and second hydraulic chambers by a piston on a steered shaft; a variable displacement electric pump that supplies hydraulic fluid to the hydraulic cylinder; a selector valve selectively set in a mode in which the hydraulic fluid is supplied to the first hydraulic chamber and drained from the second hydraulic chamber or in a mode in which the hydraulic fluid is supplied to the second hydraulic chamber and drained from the first hydraulic chamber; a detector that detects torque, steering angle, and/or vehicle speed; and a controller.
    Type: Grant
    Filed: October 14, 2011
    Date of Patent: May 26, 2015
    Assignee: JTEKT CORPORATION
    Inventors: Ryouichi Kubo, Yasuhiro Tomagou, Akihiko Shiina, Masahiko Sakamaki, Tetsuya Ozaki
  • ENERGY ABSORBING STEERING APPARATUS
    Publication number: 20150137499
    Abstract: An energy absorbing steering apparatus in which shock applied to a steering column is absorbed by plastic deformation of a bracket for suspending the steering column from a vehicle body. The bracket includes: a first plate portion; a second plate portion bent from a rear edge of the first plate portion toward a lower portion; a third plate portion bent from a lower edge of the second plate portion toward a rear upper portion; and a fourth plate portion bent from an upper edge of the third plate portion toward the lower portion. An angle of a first bent portion between the first and second plate portions is an obtuse angle. An angle of a second bent portion between the second and third plate portions is an acute angle. An angle of a third bent portion between the third and fourth plate portions is an acute angle.
    Type: Application
    Filed: May 24, 2013
    Publication date: May 21, 2015
    Applicant: JTEKT CORPORATION
    Inventor: Yoshikazu Kawada
  • FLEXIBLE MANUFACTURING SYSTEM
    Publication number: 20150142156
    Abstract: There is provided a flexible manufacturing system that can reliably place a workpiece that isn't defective piece in a state where the workpiece will be machined again. After a pallet is conveyed to a standby position and before machining of the workpiece attached to the pallet is started, controllers determines whether machining of the workpiece with a corresponding machining device is possible. When it is determined that machining is possible, the controller starts machining with the machining device. When it is determined that machining is impossible, the controller make a conveyor convey the pallet from the standby position to a pallet storage room, and stores the machining status information on the conveyed pallet as the machining-waiting state.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 21, 2015
    Applicant: JTEKT CORPORATION
    Inventors: Katsuhiro MASEKI, Tatsuhiko INAGAKI, Takaaki SUGIURA, Kazuhiro TSUJIMURA
  • Power generating device
    Patent number: 9035476
    Abstract: A power generating device includes an input rotor that is provided to an output shaft of speed up gears so as to be capable of rotating together with the output shaft, an output rotor that is provided to a drive shaft of a generator so as to be capable of rotating together with the drive shaft, and a one-way clutch that is disposed between the input rotor and the output rotor. The one-way clutch connects the input rotor with the output rotor so as to rotate together with the input rotor and the output rotor when the rotation speed of the input rotor exceeds the rotation speed of the output rotor, and the one-way clutch is configured to release the connection between the input rotor and the output rotor when the rotation speed of the input rotor falls below the rotation speed of the output rotor.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: May 19, 2015
    Assignee: JTEKT CORPORATION
    Inventors: Hideki Fujiwara, Masaaki Ohtsuki
  • Speed reduction mechanism and motor torque transmission apparatus including the same
    Patent number: 9033840
    Abstract: A speed reduction mechanism includes a bearing mechanism arranged on an axis of an output mechanism and including ball bearings that are arranged in parallel with each other in an axial direction of a differential case. The differential case is rotatably supported by the ball bearings of the bearing mechanism such that the entirety of an outer periphery of one of the ball bearings faces an inner periphery of a first housing element that accommodates the differential case and that is made of a material having a stiffness lower than a stiffness of a material of a rotation force applying member, and the entirety of an outer periphery of the other one of the ball bearings faces an inner periphery of the rotation force applying member.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: May 19, 2015
    Assignee: JTEKT Corporation
    Inventors: Keita Nomura, Kunihiko Suzuki, Hiroshi Takuno
  • Tool radius adjusting method in machine tool and machine tool for practicing the method
    Patent number: 9033623
    Abstract: At a contact step in a tool radius adjusting method, a reference portion of a movable body provided radially movably on a housing of a boring tool and a position adjusting reference member fixed on a machine tool are brought into contact by sliding the movable body relative to the housing so that the position of a cutting blade comes to a predetermined position in a direction to go away from a rotational axis. Then, at an adjusting step, the position of the cutting blade relative to the rotational axis is adjusted by changing the relative position between a tool spindle holding the boring tool and the position adjusting reference member in a direction to come close to each other by drive mechanisms of the machine tool used for positioning a spindle head with the tool spindle relative to a workpiece in machining the workpiece with the cutting blade.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: May 19, 2015
    Assignee: JTEKT CORPORATION
    Inventors: Eiji Nakamura, Akihiko Kadota, Takashi Yokoyama, Yasuhiro Komai, Harumi Sawaki, Shun Sawaki, Aya Sawaki, Taku Sawaki
  • Method and device for preventing slip of work piece
    Patent number: 9033762
    Abstract: A master servo motor and a slave servo motor that synchronously drive for rotation a master main spindle provided with a center that supports one end of a work piece and a slave main spindle provided with a center that supports the other end of the work piece are included. Before grinding, a slip detection cycle that detects a limit current value for the servo motors, at which the work piece and the centers slip, is executed and, during grinding, a grinding condition is changed to prevent a slip between the work piece and the centers in advance at the time when any one of current values of the servo motors has reached a slip threshold value set on the basis of the limit current value.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: May 19, 2015
    Assignee: JTEKT Corporation
    Inventor: Akira Makiuchi
  • Electrically operated power steering device
    Patent number: 9030135
    Abstract: An electric power steering apparatus includes an EPS actuator that applies assist force to a steering system, and an ECU that controls operation of the EPS actuator. The ECU includes an inverter device, a gate driver circuit, a gate driver power source, a microcomputer, and the like. The microcomputer switches assist control to assist stop control, based on an indication of a voltage decrease in the gate driver power source.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: May 12, 2015
    Assignee: JTEKT Corporation
    Inventor: Hiroshi Kawamura
  • Electric power steering apparatus
    Patent number: 9030181
    Abstract: An electric power steering apparatus includes a power supply and a power supply management unit that controls an operation of the power supply. The power supply includes a main power supply, an auxiliary power supply connected in series to the main power supply, a boost circuit that charges the auxiliary power supply by boosting an output voltage of the main power supply and applying the boosted output voltage to the auxiliary power supply, and a voltage sensor that detects an output voltage of the auxiliary power supply. When a reduction amount per unit time of the output voltage detected by the voltage sensor exceeds a voltage reduction amount over a predetermined time, the power supply management unit determines that an abnormality has occurred in an output destination of the power supply.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: May 12, 2015
    Assignee: JTEKT Corporation
    Inventor: Noritake Ura
  • Vehicle attitude control system
    Patent number: 9026334
    Abstract: A vehicle attitude control system includes a control unit that calculates a front wheel control amount and a rear wheel control amount on the basis of a front-side slip angle at a front axle of front wheels and a rear-side slip angle at a rear axle of rear wheels, and that controls the front wheels on the basis of the front wheel control amount and controls the rear wheels on the basis of the rear wheel control amount at the same time.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventors: Shuuji Kimura, Masayasu Higashi
  • Four-wheel-drive vehicle and control unit for four-wheel-drive vehicle
    Patent number: 9022158
    Abstract: A four-wheel-drive vehicle includes a dog clutch provided between a propeller shaft and an engine, a torque coupling provided between a rear differential and rear wheels, and an ECU that controls the dog clutch and the torque coupling. When a drive mode is switched from a two-wheel-drive mode where the transmissions of torque by the dog clutch and the torque coupling are both interrupted, to a four-wheel-drive mode, the ECU sets the amount of torque that is transmitted by the torque coupling to a first torque value (T1) to increase the speed of rotation of the propeller shaft, and then sets the amount of torque that is transmitted by the torque coupling to a second torque value (T2) that is lower than the first torque value (T1), and engages the dog clutch when the rotations of first and second rotary members of the dog clutch are synchronized with each other.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventor: Masaki Mita
  • Vehicle control unit
    Patent number: 9026326
    Abstract: When a vehicle speed is equal to or higher than a first vehicle speed threshold value or an uphill gradient is lower than a first gradient threshold value and uphill start control is cancelled, if a state where the vehicle speed is lower than a second vehicle speed threshold value and the uphill gradient is equal to or higher than a second gradient threshold value continues for a first set time, uphill start control is executed. When the vehicle speed is decreased after being once increased within a range where the vehicle speed is lower than the first vehicle speed threshold value and uphill start control is cancelled, if a state where the vehicle speed is lower than the second vehicle speed threshold value and the uphill gradient is equal to or higher than the second gradient threshold value continues for a second set time, the uphill start control is executed.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventors: Tomohiro Nozu, Ryohei Shigeta
  • Cylindrical roller bearing
    Patent number: 9022661
    Abstract: A guide piece projects from an outside surface of a cage bar of a cage so as to make sliding contact with a raceway surface of an outer ring. As the cage rotates, the guide piece operates to guide the rotation of the cage while removing an excess grease on the raceway surface and transferring the excess grease to axially opposite ends of the outer ring. The guide piece is formed with a through-hole extending from an inner periphery of the cage to an edge of the guide piece for supplying the lubricant from the inner periphery side of the cage to the raceway surface.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: May 5, 2015
    Assignee: Jtekt Corporation
    Inventor: Yuichiro Hayashi
  • Rotor for motor and method of manufacturing the same
    Patent number: 9024496
    Abstract: At least part of each bridge portion is heated and molten to form a keyhole, and a nonmagnetic element is disposed around the keyhole. Thus, even when the width of the bridge portion in the radial direction is increased, the bridge portion is demagnetized. Therefore, leakage flux in the bridge portion is reduced, and the output power of a motor is increased. Moreover, by increasing the width of the bridge portion in the radial direction, the strength of the bridge portion is increased, and breakage of the bridge portion due to a centrifugal force at high-speed rotation of a rotor is prevented.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventors: Takaya Nagahama, Masami Naka, Kouji Kitahata, Yoshiyuki Shibata, Shigeki Nagase, Takashi Kageyama
  • Steering device
    Patent number: 9022426
    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: Grant
    Filed: December 20, 2013
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventor: Toru Sakata
  • Steering system
    Patent number: 9024628
    Abstract: A steering system includes a steering shaft an electric motor that assists a steering component; a torque detection device that generates a first detection signal according to a steering torque; and a compensation sensor that generates a second detection signal according to a magnetic flux around the steering shaft and its surrounding structure. In the steering system, an output signal, in which an influence of the magnetic field around the steering shaft and its surrounding structure is reduced, is generated based on a signal correction computing equation based on information on correlation between the first detection signal and the second detection signal. Then, in the steering system, the electric motor is driven based on the output signal.
    Type: Grant
    Filed: November 13, 2013
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventors: Masahide Nakamura, Masafumi Kajitani, Zijin Wu, Jianchao Jiang
  • PUMP APPARATUS WITH SWITCHING VALVE AND DRIVING POWER TRANSMISSION DEVICE
    Publication number: 20150114790
    Abstract: A pump apparatus with a switching valve includes an actuator that is rotationally driven, a pump, a switching valve and a driving power interrupting device. The pump discharges a fluid sucked by rotational driving of the actuator. The switching valve is changed in phase by the rotational driving of the actuator so as to be switchable among a plurality of destinations of the fluid discharged from a pump chamber of the pump. The driving power interrupting device for a valve is switchable between a state where rotational driving power of the actuator is transmitted to the switching valve and a state where the rotational driving power of the actuator is interrupted.
    Type: Application
    Filed: October 28, 2014
    Publication date: April 30, 2015
    Applicant: JTEKT Corporation
    Inventor: Motoyasu YAMAMORI
  • Steering system and coupling wire
    Patent number: 9016160
    Abstract: A telescopic-type steering system includes an upper tube and a lower tube that are coupled to each other such that relative displacement between the upper tube and the lower tube is allowed. The steering system includes a coupling wire that is at least partially formed of an insulating member and that has one end portion and the other end portion that are electrically insulated from each other. In the steering system, the upper tube and the lower tube are coupled to each other by the coupling wire.
    Type: Grant
    Filed: June 15, 2011
    Date of Patent: April 28, 2015
    Assignee: JTEKT Corporation
    Inventors: Yuichi Ichie, Yoshihide Ohara, Kazutaka Awata, Toru Suzuki
  • Driving force distribution controller and four-wheel drive vehicle
    Patent number: 9020723
    Abstract: A driving force distribution controller comprises: a control device determining the value of torque which must be transmitted to a rear wheel; and a driving force transmission device transmitting torque corresponding to the torque value determined by the control device to the rear wheel. The control device reduces a torque value calculated based on an opening degree of an accelerator and a rotational speed difference when the rotational speed of an engine is lower than a first threshold value but higher than a second threshold value.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: April 28, 2015
    Assignees: JTEKT Corporation, Mazda Motor Corporation
    Inventors: Ryohei Shigeta, Akiyoshi Kakita, Masaki Mita, Akira Kodama, Yasushi Yagi
  • Control board device with graphical user interface
    Patent number: D728578
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: May 5, 2015
    Assignee: JTEKT Corporation
    Inventors: Koji Kito, Hiroyuki Takahara