Patents Assigned to JTEKT
  • Abnormality diagnosing method for sound or vibration and abnormality diagnosing apparatus for sound or vibration
    Patent number: 7933742
    Abstract: A noise detection signal detected at an evaluation point is filtered by a low pass filter, so that an evaluation waveform signal is extracted. A real signal mother wavelet of complex type is derived from the extracted evaluation waveform signal. Using this mother wavelet, an abnormal waveform signal stored in advance is processed by wavelet transformation. Then, a correlation value is calculated between the abnormal waveform signal and the mother wavelet. The correlation value is compared with a predetermined criterion, so that the presence or absence of abnormality in a sound source or vibration source corresponding to each abnormal waveform signal is determined.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: April 26, 2011
    Assignees: JTEKT Corporation, Zhong Zhang
    Inventors: Hideaki Ishii, Hiroshi Uemura, Zhong Zhang
  • Sensor-equipped cover for vehicular-wheel bearing assembly
    Patent number: 7931406
    Abstract: A sensor-equipped structure of a vehicular-wheel bearing assembly mounted to an outer ring member of a vehicular-wheel bearing assembly, is provided with a sensor portion for detecting the rotation of an inner ring member rotatably disposed on a radially inner side of the outer ring member, and a cover formed of a metal. The sensor portion includes a sensor element for magnetically detecting the rotation of the inner ring member; a connector for supporting a terminal electrically connected with the sensor element; and a capacitor. The sensor portion is molded of a synthetic resin and unified with the cover. The cover has a through hole, the synthetic resin extends from an inner side of the cover through the through hole into the connector, the synthetic-resin is in contact with an inner surface of the cover and not in contact with a circumferential surface of the cover defining the through-hole.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: April 26, 2011
    Assignees: JTEKT Corporation, Aisin Seiki Kabushiki Kaisha
    Inventors: Shunichi Matsui, Masahiro Kimura
  • Variable stiffness stabilizer device
    Patent number: 7931281
    Abstract: A variable stiffness stabilizer device (1) has a stabilizer bar (2) and actuators (3). The stabilizer bar (2) has a torsion bar (4) extending in the lateral direction (X1) of a vehicle and arms (6) connected through bend portions (5) to the ends (4a, 4b) of the torsion bar (4) and bendingly deformed according to the strokes of wheel supporting members (11). Variable bending stiffness parts (13; 130) of the arms (6) are rotatable about the axes (C1) of the arms (6), so that the bending stiffness of the arms (6) can be changed according to their rotational positions. The actuators (3) rotationally drive the variable bending stiffness parts (13; 130) about the axes (C1) to adjust the rotational positions of the variable bending stiffness parts (13; 130).
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: April 26, 2011
    Assignee: JTEKT Corporation
    Inventors: Shingo Maeda, Sadahiro Kawahara, Masanori Arima, Kosuke Yamanaka
  • GRINDING MACHINE
    Publication number: 20110092139
    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: Application
    Filed: October 18, 2010
    Publication date: April 21, 2011
    Applicant: JTEKT CORPORATION
    Inventors: Kikutoshi OKADA, Shinji Deguchi, Dai Kiyota
  • Rack guide and rack-and-pinion type steering apparatus having the rack guide
    Patent number: 7926376
    Abstract: A rack and pinion steering device has a pinion rotatable in the R-direction, a rack bar having rack teeth meshing with the pinion and rectilinearly movable in the A-direction, a housing for rotatably supporting the pinion, a rack guide for slidably supporting the rack bar, and an elastic means for pressing the rack guide toward the pinion.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: April 19, 2011
    Assignees: Oiles Corporation, JTEKT Corporation
    Inventors: Masahiko Hirose, Masaaki Hashimoto, Nobuyuki Sato, Masao Shimura, Yoshiro Kuzumi
  • Sealing apparatus and bearing apparatus having the same
    Patent number: 7926817
    Abstract: A sealing apparatus includes a slinger which includes a cylindrical portion, and radially-extending portions and provided respectively at axially-opposite ends of the cylindrical portion and an elastic member which includes a base portion fixed to a surface of an inner radially-extending portion of a radially-extending core metal member, and a lip portion connected with the base portion. The lip portion is formed by a first axial lip contacting one radially-extending portion of the slinger and a second axial lip contacting the other radially-extending portion of the slinger. The elastic member is formed such that in an axial cross-section, the distance between a cylindrical portion-opposing surface of the elastic member radially opposed to the cylindrical portion and the cylindrical portion is increasing generally uniformly axially outward.
    Type: Grant
    Filed: February 5, 2008
    Date of Patent: April 19, 2011
    Assignee: JTEKT Corporation
    Inventors: Kazutoshi Yamamoto, Masahiro Tabata
  • SHOCK ABSORBING STEERING APPARATUS
    Publication number: 20110084470
    Abstract: An upper bracket for mounting a column to a vehicle body includes a column support portion which is press-fitted on an outer periphery of the column through axial press-fitting action with a predetermined interference between the column and the column support portion. Hence, the column is in relative press-fit relation to the bracket and is normally in pressure contact with the column support portion. Therefore, if a secondary collision exerts an impact force on the column pushing the column in the axial direction, the column is moved as generating strong friction with the column support portion. Accordingly, the impact energy of the secondary collision is attenuated by the friction. Thus, a shock absorbing steering apparatus featuring a simple structure ensuring a stable operation can be provided.
    Type: Application
    Filed: June 22, 2009
    Publication date: April 14, 2011
    Applicant: JTEKT CORPORATION
    Inventors: Yasuhiro Tanioka, Terukazu Nakajima, Takashi Sumida, Yoshikazu Kawada
  • STEERING APPARATUS
    Publication number: 20110079102
    Abstract: A steering apparatus includes a first shaft coupled to a steering wheel, a second shaft arranged to be eccentric relative to the first shaft, and a joint mechanism for coupling the first shaft and the second shaft to each other. The joint mechanism includes a cam having a cam groove that extends in a direction perpendicular to the first shaft, a cam follower that can slide in the cam groove, an eccentric pin for coupling the second shaft and the cam follower to each other at a position eccentric relative to the second shaft. An outer cylinder serving as a protective member is arranged concentrically with the eccentric pin, so as to surround the outer circumference of the eccentric pin. At least part of the eccentric pin and the outer cylinder is arranged in the cam groove.
    Type: Application
    Filed: June 26, 2009
    Publication date: April 7, 2011
    Applicants: JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Tomonari Yamakawa, Hajime Tanaka
  • ROTATIONAL ANGLE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM
    Publication number: 20110080160
    Abstract: An ECU detects a steering angle that is an absolute angle based on a sine signal and a cosine signal that are output from a steering sensor. The ECU includes a three-phase pulse generator that generates, based on the sine signal and the cosine signal, three-phase pulse signals that have edges corresponding to predetermined rotational angles and that are set in such a manner that the predetermined rotational angles corresponding to the respective edges do not overlap each other and are at regular intervals. A microcomputer has a function as a second rotational angle detector that calculates a steering angle based on the pulse signals.
    Type: Application
    Filed: September 29, 2010
    Publication date: April 7, 2011
    Applicant: JTEKT CORPORATION
    Inventor: Akihiro TOMITA
  • SPINDLE DEVICE FOR MACHINE TOOL
    Publication number: 20110081216
    Abstract: The damping property of a rear rolling bearing (133) is adjusted by controlling a damping force that is applied by damping application means (5, 134) based on, for example, the type of a tool (T). Thus, it is possible to provide the optimum damping properties for various tools that differ in natural vibration, and to suppress the generation of chattering of the various tools. As a result, it is possible to increase the cut amount per unit time to increase the productivity.
    Type: Application
    Filed: October 6, 2010
    Publication date: April 7, 2011
    Applicant: JTEKT Corporation
    Inventors: Kazunari OGURA, Nobumitsu Hori, Kunimichi Nakashima, Yuji Okawa, Takamasa Shibata
  • Electric power steering apparatus
    Patent number: 7918306
    Abstract: In an electric power steering apparatus, a phase control characteristic for a signal corresponding to detected steering torque is changed according to the judgment whether the steering is in a return steering state or a feed steering state, so that a response of a variation of target output value of a motor for generating steering assist power to a variation of the detected steering torque decreases in the return steering state in comparison with that in the feed steering state. An output control characteristic of the motor is changed according to the judgment synchronously with the change of the phase control characteristic, so that a response of a variation of the output command value to a variation of deviation between the target output value and actual output value decreases in the return steering state in comparison with that in the feed steering state.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: April 5, 2011
    Assignee: JTEKT Corporation
    Inventor: Terutaka Tamaizumi
  • Electromagnetic actuator, electromagnetic clutch including said electromagnetic actuator, and driving force transmitting apparatus for vehicle including said electromagnetic clutch
    Patent number: 7913827
    Abstract: An electromagnetic actuator includes a supporting member supporting an electromagnetic coil around which a wire is wound, a moving member positioned facing the supporting member so as to move forward and backward, and an actuating force transmitting member transmitting moving force of the moving member to a member to be actuated as an actuating force. The moving member is moved towards the supporting member by magnetic force generated by applying an electric current to the electromagnetic coil to apply the actuating force to the member to be actuated via the actuating force transmitting member. The electromagnetic coil includes a plurality of electromagnetic coils provided at the supporting member.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: March 29, 2011
    Assignee: JTEKT Corporation
    Inventors: Yoshihiro Niikawa, Kunihiko Suzuki, Motoshi Kawamura
  • Electric power steering apparatus
    Patent number: 7913805
    Abstract: A rotational angle sensor used in an electric power steering apparatus detects a rotational angle of a motor shaft at a portion on a steering system side, as a motor rotational angle (?m). A MPU sets a base correction amount (???m) based on a q-axis actual current value (Iq). The MPU sets a rotational angle correction amount (??m) used to correct the motor rotational angle (?m) by decreasing the base correction amount (???m) as a rotational angular speed (?) increases and by increasing the base correction amount (???m) as a torque differential value (dT/dt) increases.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: March 29, 2011
    Assignee: JTEKT Corporation
    Inventors: Akihiro Tomita, Atsuo Sakai, Satoru Mikamo
  • ROTATIONAL ANGLE SENSOR, MOTOR, ROTATIONAL ANGLE DETECTOR, AND ELECTRIC POWER STEERING SYSTEM
    Publication number: 20110068780
    Abstract: A rotational angle sensor includes: a magnet rotor in which multiple magnetic poles are formed along the circumferential direction of the magnet rotor; and three sensor devices that are arranged on a circle concentric with the magnet rotor at regular angle intervals. Each of the sensor devices includes three half-bridge circuits each of which has a pair of spin valve magnetic resistances that are connected in series in such a manner that the magnetization directions of spin fixed layers of the spin valve magnetic resistances are opposite to each other. Each of the sensor devices is formed in such a manner that phases of the sensor signals output from the respective half-bridge circuits based on a change in magnetic flux caused by the rotation of the magnet rotor are offset from each other by an electrical angle of 120°.
    Type: Application
    Filed: September 20, 2010
    Publication date: March 24, 2011
    Applicant: JTEKT CORPORATION
    Inventor: Kazuya Sakai
  • ELECTRIC POWER STEERING SYSTEM
    Publication number: 20110071730
    Abstract: An ECU of an electric power steering system includes a driving circuit configured as an H bridge circuit; a microcomputer that controls the driving circuit; a capacitor for stabilizing electric power that is supplied to the driving circuit; and a resistor that is interposed in a second power supply path that bypasses a first power supply path in which the relay contact is interposed. The microcomputer causes a relay circuit to be activated after the capacitor is charged via the resistor (second power supply path). The microcomputer determines whether a stuck-open fault has occurred on the basis of a voltage difference between terminals of the relay contact at the time when both FETs that are connected in series and that constitute the driving circuit are turned on to cause the discharge of the capacitor after the relay circuit is activated.
    Type: Application
    Filed: September 20, 2010
    Publication date: March 24, 2011
    Applicant: JTEKT CORPORATION
    Inventor: Tomoya Nakai
  • PLC for distributed control and distributed control system
    Patent number: 7912558
    Abstract: A PLC for distributed control includes a storage unit that stores common-data specifying information for specifying common data shared by a corresponding PLC and another PLC, a receiving unit that receives the common-data specifying information from another PLC, and a collating unit that collates the common-data specifying information stored in the storage unit with the common-data specifying information received by the receiving unit.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: March 22, 2011
    Assignee: JTEKT Corporation
    Inventors: Tsutomu Araki, Sutemaro Kato, Friedrich Adams, Michael Niehaus
  • Double row ball bearing and differential gear device
    Patent number: 7909515
    Abstract: The difference between a revolution period of larger diameter-side balls and a revolution period of smaller diameter-side balls is smaller as compared with a conventional bearing. The relation, (??10)??<?, is established, where ?(°) represents a contact angle of the larger diameter-side ball, and ?(°) represents a contact angle of the smaller diameter-side ball.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: March 22, 2011
    Assignee: Jtekt Corporation
    Inventors: Atsushi Takimoto, Youzou Taniguchi
  • Electric power steering apparatus
    Patent number: 7909131
    Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating the state of a steering system, a frequency component corresponding to a vibration that increases generation of a rattling noise in a speed reducing mechanism. The extracting section outputs an effective value of the extracted frequency component as a power spectrum. If the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer outputs a motor control signal to reduce the assist force generated by the EPS actuator.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: March 22, 2011
    Assignee: JTEKT Corporation
    Inventor: Akihiko Nishimura
  • Rolling bearing device
    Patent number: 7909513
    Abstract: A groove is formed on one end face side of a cage including a plurality of pockets for holding individually rolling elements which extends circumferentially along a full circumference of the cage about a rotational center thereof and has a bottom portion which communicates individually with the plurality of pockets, and a distal end portion of a nozzle of an oil supply unit is inserted into the groove, whereby the generation of disturbance to airflow and negative pressure in the vicinity of an opening of the nozzle is suppressed when a rolling bearing rotates, so that lubricating oil supplied from the nozzle is allowed to reach the rolling elements in an ensured fashion.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: March 22, 2011
    Assignee: JTEKT Corporation
    Inventors: Hiroshi Ueno, Kazuya Suzuki, Hiroyuki Urano
  • MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING SYSTEM
    Publication number: 20110062905
    Abstract: A motor control device is configured in such a manner that a current detection circuit and an exciting circuit for a motor resolver share one grounding wire. A microcomputer that serves as a current detector sets a phase of an exciting current in such a manner that values of an excitation noise superimposed on an output voltage of the current detection circuit at respective timings (L1, H1, L2, H2, . . . ), at which the output voltage is acquired in one current detection process, are equal to each other. An electric power steering system is provided with the motor control device.
    Type: Application
    Filed: September 7, 2010
    Publication date: March 17, 2011
    Applicant: JTEKT CORPORATION
    Inventor: Atsuo SAKAI