Patents Assigned to JTEKT
  • WATERPROOF STRUCTURE OF ELECTRONIC UNIT
    Publication number: 20120236479
    Abstract: A waterproof structure of an electronic unit includes a case that defines a housing portion housing a first terminal, and a connector that includes an insulating body attached to the case. The connector includes a second terminal that is supported by the insulating body and connects a conductor end portion of a cable to the first terminal. The insulating body includes a wall portion that partitions a part of the housing portion by covering an open portion of the case. The insulating body includes a cable lead-in portion that defines a cable lead-in hole for leading the cable into the case and is joined to the wall portion. A potting resin is filled in a space between the inner periphery of the cable lead-in hole and the outer periphery of the cable and the housing portion and cured.
    Type: Application
    Filed: March 13, 2012
    Publication date: September 20, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Toshio TAMAI, Takahiro SANADA
  • Steering apparatus
    Patent number: 8266980
    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: Grant
    Filed: June 26, 2009
    Date of Patent: September 18, 2012
    Assignees: Jtekt Corporation, Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomonari Yamakawa, Hajime Tanaka
  • ROTATION ANGLE DETECTION DEVICE AND TORQUE DETECTION DEVICE
    Publication number: 20120227514
    Abstract: A rotor includes a cylindrical magnet having a plurality of magnetic pole pairs. There are two types of the magnitude of magnetic force in the magnetic pole pairs, that is, a relatively large first magnetic force and a second magnetic force that is smaller than the first magnetic force. Three magnetic sensors are arranged around the rotor. A rotation angle computing device detects the peak values of output signals of the respective magnetic sensors. Then, the rotation angle computing device identifies the magnetic pole pair, sensed by the first magnetic sensor, based on a combination of the local maximum values of the three output signals.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventor: Takeshi UEDA
  • CHATTERING DETECTION METHOD FOR MACHINE TOOL
    Publication number: 20120232812
    Abstract: Reference phase variation values ?k1 to ?Kn, each of which is a variation among a plurality of phases that occur during non-machining and phase variation values ?1 to ?n, each of which is a variation among a plurality of phases that occur during machining are detected from measured vibration with the use of a chattering detector that is used to calculate phases of a desired number (n) of frequencies. If ?Ki??i is smaller than a determination value TK, it is determined that chattering having a frequency i is occurring.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Toshiyuki OKITA, Ryota Tanase, Shigeru Matsunaga
  • METHOD OF MANUFACTURING SHAFT MEMBER FOR WHEEL ROLLING BEARING DEVICE
    Publication number: 20120227459
    Abstract: According to a method of manufacturing a flanged shaft member having a plurality of flanges used to fasten the shaft member to a wheel, when the flanges are formed on a part between a shaft portion and a fitting shaft portion through lateral extrusion while a forged recess is formed at a center of an end surface of the fitting shaft portion with the use of a forging die apparatus for cold forging, each flange is formed so as to be curved in a direction opposite to a direction, in which the flange warps due to springback caused after the lateral extrusion, by an amount corresponding to an amount of warpage due to the springback.
    Type: Application
    Filed: February 21, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventor: Motonori NAKAO
  • ROTATION ANGLE DETECTION APPARATUS
    Publication number: 20120232839
    Abstract: A first third harmonic component removing portion calculates an approximate value (sin ?)n of a signal sin ? that is an output signal of a first magnetic sensor from which third harmonic components have been removed. A second third harmonic component removing portion calculates an approximate value (cos ?)n of a signal cos ? that is an output signal of a second magnetic sensor from which third harmonic components have been removed. A rotation angle calculation portion calculates a rotation angle ? of a rotor based on the approximate value (sin ?)n of sin ?, which has been calculated by the first third harmonic component removing portion and the approximate value (cos ?)n of cos ?, which has been calculated by the second third harmonic component removing portion.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventor: Takeshi UEDA
  • ROTATION ANGLE DETECTION DEVICE
    Publication number: 20120229126
    Abstract: When the zero-crossing of one of the output signals of magnetic sensors has been detected, a rotation angle computing device identifies a magnetic pole sensed by the first magnetic sensor based on the other two output signals. Subsequently, the rotation angle computing device identifies the magnetic pole sensed by the second magnetic sensor and the magnetic pole sensed by the third magnetic sensor based on the magnetic pole sensed by the first magnetic sensor. After that, the rotation angle computing device corrects the amplitude of the output signal of each magnetic sensor based on the identified magnetic poles respectively sensed by the magnetic sensors. Then, the rotation angle computing device computes the electric angle ?e of the rotor based on the corrected output signals.
    Type: Application
    Filed: February 29, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Shingo Maeda, Takeshi Ueda
  • ELECTRIC PUMP UNIT
    Publication number: 20120230850
    Abstract: A motor housing that accommodates a pump-driving electric motor and a controller that controls the electric motor is fixed to a pump body of a pump that sucks and discharges oil. A sealed motor chamber that accommodates the electric motor is formed within the motor housing.
    Type: Application
    Filed: March 2, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Akihiko KAWANO, Hiroki KAGAWA
  • MANUFACTURING METHOD FOR WHEEL ROLLING BEARING DEVICE, AND WHEEL ROLLING BEARING DEVICE
    Publication number: 20120230624
    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: Application
    Filed: February 21, 2012
    Publication date: September 13, 2012
    Applicant: JTEKT CORPORATION
    Inventor: Yoshinori MASUDA
  • Method for creating profile data used to process non-circular workpiece
    Patent number: 8265783
    Abstract: Lift data in which a lift amount is set based on a lift data rotation angle is read to identify the shape of a non-circular workpiece, and a profile point group that is formed of a plurality of profile points, each of which indicates a tool reciprocation position that corresponds to a spindle rotation angle, is calculated based on the read lift data. Then, the calculated profile point group is divided into a plurality of groups each of which is formed of the profile points that satisfy a group division condition, the two groups that satisfy a group comparison condition are selected, and the profile point that satisfies a specific point deletion condition that is set in advance for the combination of the selected two groups is deleted.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: September 11, 2012
    Assignee: JTEKT Corporation
    Inventor: Akira Saito
  • Rolling bearing device and roll apparatus for continuous casting installation
    Patent number: 8262549
    Abstract: A tapered roller thrust bearing is disposed in each of both sides in an axial direction of a cylindrical roller bearing with aligning housing ring which is provided with an inner ring, an outer ring, cylindrical rollers and an aligning housing ring. The tapered roller thrust bearing is constituted by disposing tapered rollers between a first raceway surface which is an outer side face in the axial direction of the outer ring and a second raceway surface of a side raceway ring disposed in an outer side in the axial direction of the outer ring. An intersection of lines extended from generatrices of each of the tapered rollers which are in contact with the first raceway surface and the second raceway surface, and an intersection of lines extended from the first raceway surface and the second raceway surface are disposed on a curvature center of the aligning sliding surface.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: September 11, 2012
    Assignee: JTekt Corporation
    Inventor: Takeharu Uranishi
  • ROLLING/SLIDING PART AND PRODUCTION METHOD THEREOF
    Publication number: 20120222778
    Abstract: A production method of a rolling/sliding part which includes applying a spherodizing annealing treatment to a steel to render an average particle diameter of the carbide of the surface layer portion in a range of 0.3 to 0.6 ?m and a maximum particle diameter thereof 4 ?m, to render the surface hardness 62 or more by Rockwell C hardness and to render a solid solution carbon amount in a residual austenite of the surface layer portion in a range of 0.95 to 1.15% by weight.
    Type: Application
    Filed: May 15, 2012
    Publication date: September 6, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Katsuhiko KIZAWA, Tsuyoshi Mikami
  • Rotation urging mechanism and pulley device
    Patent number: 8257210
    Abstract: A rotation urging mechanism includes: an outer member which has an outer raceway surface on its inner periphery and is rotatable about a first axis; an inner member which has on its outer periphery an inner raceway surface disposed in face-to-face relation to a radially inner side of the outer raceway surface over an entire circumference thereof and is rotatable about the first axis; and a plurality of balls disposed rollably between the outer raceway surface and the inner raceway surface. The outer raceway surface is formed about a second axis which is inclined with respect to the first axis, and the inner raceway surface is formed about a third axis which is inclined with respect to the first axis.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: September 4, 2012
    Assignee: JTEKT Corporation
    Inventor: Hideki Fujiwara
  • Sliding-type tripod-shaped constant-velocity universal joint
    Patent number: 8257186
    Abstract: A sliding-type tripod-shaped constant-velocity universal joint capable of being downsized while reducing induced thrust force. The constant-velocity universal joint includes: an outer race; a tripod including a boss portion and three tripod-shaft portions being inserted into roller grooves; and rollers. And, a shaft-axis-wise width of the tripod-shaft portions is formed smaller as it goes from the root side to the leading-end side in a torque transmission region of the tripod-shaft portions. Further, a torque-transmission-wise width of the tripod-shaft portions is formed greater as it goes from the root side to the leading-end side in the torque transmission region when defining a direction that intersects with the shaft axis and the tripod-shaft portions orthogonally as a torque transmission direction.
    Type: Grant
    Filed: July 7, 2008
    Date of Patent: September 4, 2012
    Assignee: JTEKT Corporation
    Inventors: Kazuyuki Ichikawa, Hiromasa Kinoshita
  • RESOLVER, AND RESOLVER-BEARING UNIT INCLUDING THE SAME
    Publication number: 20120217828
    Abstract: A resolver-bearing unit according to the invention includes a resolver sensor that detects the rotational position of a shaft. The resolver sensor includes an annular stator disposed around a rotor; and a case that is fitted to an outer periphery of the stator, and covers the rotor and the stator. The stator includes an annular stator core with a plurality of teeth formed on an inner periphery thereof; first and second insulators; and coils respectively wound around the teeth via the first and second insulators. The first insulator is provided with a connector. The connector connects a harness for outputting detected rotational position of the shaft to lead wires that extend from the coils, with the harness extending in an axial direction of the shaft.
    Type: Application
    Filed: February 9, 2012
    Publication date: August 30, 2012
    Applicant: JTEKT CORPORATION
    Inventors: Tomoyuki TAKEI, Kouji KITAHATA, Toshiki KUMENO
  • Electric power steering device
    Patent number: 8251172
    Abstract: In an electric power steering device, if the temperature of a specific site that increases due to the driving of a steering assist motor exceeds a threshold, the motor current is controlled to be equal to or below a current restriction value. The temperature Toff of the specific site detected when an engine is stopped, and the current restriction value Ioff provided when the engine is stopped are stored into a storage. A temperature difference Ta between the temperature detected when a starter switch is turned on and the temperature Toff is computed. If the temperature of the specific site when the starter switch is turned on is above the threshold, the current restriction value is set to be equal to or above the current restriction value Ioff stored in the storage, according to the temperature difference Ta, over a time following the turning-on of the starter switch.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: August 28, 2012
    Assignee: JTEKT Corporation
    Inventors: Hiroyasu Inoue, Tetsuya Ozaki
  • Spindle device
    Patent number: 8253575
    Abstract: A spindle device is provided with a temperature sensor for detecting the temperature of an antifriction bearing or the temperature of a part of either one of a housing and a spindle which part is influenced by a temperature change of the antifriction bearing, and an abnormality detection section for detecting the abnormality of the antifriction bearing based on the change speed of the temperature of the antifriction bearing detected by the temperature sensor, so that the abnormality of the antifriction bearing can be detected more precisely.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: August 28, 2012
    Assignee: JTEKT Corporation
    Inventor: Shigeru Matsunaga
  • CONTROLLER FOR ELECTRICAL POWER STEERING APPARATUS
    Publication number: 20120212159
    Abstract: The electrical power steering apparatus 10 includes the 1st MOS-FET 13 and the 2nd MOS-FET 14 accommodating the 1st parasitic diode 15 and the 2nd parasitic diode 16 in the conducting path between the battery 100 and the motor driving circuit 11 and being connected in series at the opposite direction respectively, and the condenser 18 in an output side of the latter 2nd MOS-FET 14. The ECU 6 of the controller of the electrical power steering apparatus controls to turn on or off the 1st MOS-FET 13 and the 2nd MOS-FET 14 in accordance with the predetermined sequence after the ignition switch 17 is turned on, detecting the fault of the 1st MOS-FET 13, the 2nd MOS-FET 14 and the 1st parasitic diode 15 and the 2nd parasitic diode 16 on the basis of the output voltage from each of the 1st MOS-FET 13 and the 2nd MOS-FET 14.
    Type: Application
    Filed: February 16, 2012
    Publication date: August 23, 2012
    Applicant: JTEKT CORPORATION
    Inventor: Hiroshi KITAMOTO
  • Steering apparatus
    Patent number: 8245813
    Abstract: There is provided a steering apparatus including a pinion communicating with an operation of a steering member, a rack shaft having a rack meshed with the pinion, and a support yoke resiliently coming into contact with the rack shaft, and being configured to convert rotation of the pinion into movement of the rack shaft in an axial direction in a meshing portion in which the pinion and rack mesh to each other. The steering apparatus comprises a detection unit for detecting a force applied to the support yoke to which a force acting on the meshing portion being transmitted from the rack shaft and a calculation unit for calculating a steering torque applied to the steering member based on the force detected by the detection unit, wherein the pinion and the rack are formed in helical gears.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: August 21, 2012
    Assignee: JTEKT Corporation
    Inventors: Takahiro Mizuno, Shiro Nakano, Kunihiro Oka
  • Transmission ratio variable mechanism and vehicle steering apparatus
    Patent number: 8245814
    Abstract: A transmission ratio variable mechanism includes an input member and an output member, which are rotatable around a first axis, an inner ring arranged to connect the input and output members to each other so as to be differentially rotatable, an outer ring, and a motor. A second axis serving as a center axis of the inner ring and the outer ring is inclined to the first axis. The transmission ratio variable mechanism includes uneven engagement sections including a projection provided on one of each of end surfaces of the inner ring and a power transmission surface corresponding to the end surface, and a recess. The inner ring includes a first member forming the first end surface and a second member forming the second end surface. The first and second members are formed separately from each other and coupled to each other so as to be movable together.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: August 21, 2012
    Assignee: JTekt Corporation
    Inventors: Atsushi Yao, Satoru Murao, Yoichiro Sankai