Patents Assigned to Koyo
  • Electric power steering device
    Publication number: 20070102228
    Abstract: An electric power steering device provided with two belleville springs for suppressing the axial movement of a worm rotated by a steering-assisting electric motor and having shaft portions at its both end portions, and limiting members for limiting the deflection amounts of the two belleville springs. The limiting members are respectively disposed at portions along the outer circumferences of the shaft portions at both end portions of the worm, the respective inner circumferential portions of the two belleville springs are formed into flat portions, the outer circumferential portions thereof are respectively formed into tapered portions having a taper shape, and the limiting members are made contact with the flat portions, thereby limiting the deflection amounts of the tapered portions. Hence, the limiting members can be provided without increasing the size of the worm serving as a small gear.
    Type: Application
    Filed: April 16, 2004
    Publication date: May 10, 2007
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Akihiko Shiina, Hiroaki Shinto, Mitsuharu Minami, Noritake Okawa, Masayoshi Sakuda
  • Bearing apparatus for supporting pinion shaft
    Publication number: 20070104403
    Abstract: A bearing apparatus for supporting a pinion shaft comprises a pair of rolling bearings which rotatably support a pinion shaft to a case and are arranged side by side in a shaft direction between a pinion gear arranged at one end of the pinion shaft, and a companion flange attached outside the other end thereof. The rolling bearing on a companion flange side comprises an angular ball bearing, and a radius of curvature Ri of an inner ring raceway, a radius of curvature Ro of an outer ring raceway, and a ball diameter Bd of the rolling bearing may satisfy a relationship given by equations of Ri<Ro, 0.502×Bd?Ri?0.512×Bd, and 0.510×Bd?Ro?0.520×Bd.
    Type: Application
    Filed: December 11, 2003
    Publication date: May 10, 2007
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Motoshi Kawamura, Muneyasu Akiyama, Hiroshi Tachi
  • Seal ring, sealing apparatus and bearing apparatus
    Patent number: 7215110
    Abstract: A seal ring has an annular body which is constituted so that a disc section extended to a radially inward direction is overlapped with one end of a cylindrical section, and a sensor member for detecting rotation of an inner ring is provided to an outer periphery of the cylindrical section, and an outer case for covering the sensor member is provided by insert-forming. The outer case contracts after it is formed and is press-contact with the cylindrical section so that a gap is hardly generated.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: May 8, 2007
    Assignees: Koyo Seiko Co., Ltd., Koyo Sealing Techno Co., Ltd.
    Inventors: Kazutoshi Toda, Minoru Sentoku, Hirokazu Arai, Fumiaki Kasahara, Shinichi Obayashi
  • Motor-driven type power steering apparatus
    Patent number: 7213677
    Abstract: A motor-driven type power steering apparatus includes: a drive gear connected to an output shaft of a motor; a driven gear in mesh with the drive gear, which is connected to a steering unit; a bearing for supporting one end of the drive gear; a support portion in which the bearing is disposed; and a curved leaf spring which has a length larger than a peripheral length of the bearing and fitted between the bearing and the support portion in a resiliently deformed state. The curved leaf spring urges the bearing so that a distance between an axis of the driven gear and an axis of the drive gear decreases.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: May 8, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Yasuhiro Nakamura, Tomonori Sugiura, Souichi Iwasa, Tomomasa Machida
  • Carburized roller member made of high carbon chromium steel
    Patent number: 7207933
    Abstract: A roller member comprising high carbon chromium bearing steel having a carburization treatment. The bearing steel comprising a surface portion defined as a range between a surface of a rolling face of the roller member to a depth where a maximum shearing stress acts thereon, the surface portion containing carbon in a total amount comprising a range of 1.0 to 1.6 wt % and an amount of residual austenite comprising a range of 20 vol % to 35 vol % wherein a compression residual stress of the surface portion comprises a range of 150 to 1000 MPa, wherein a surface hardness of the surface portion comprises a range of 64 or higher in Rockwell C hardness, wherein an amount of carbide precipitate on the surface portion comprises a range of 10% to 25% in an area rate and each carbide particle size comprises a range of 3 ?m or less.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: April 24, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Masao Goto, Katsuhiko Kizawa
  • Rotational angle detecting apparatus and torque detecting apparatus
    Patent number: 7201070
    Abstract: A rotational angle detecting apparatus, in which first targets and second targets, the number thereof is coprime with each other, are provided at the rotors rotating coaxially with each other. Rotational angle of the rotor is detected based on the detection signals from each of two sensors disposed opposite to the targets respectively, which output detection signals having phases different from each other as the rotor rotates. Based on a magnitude relation between one detection signal and the other detection signal from each of the two sensors, the range of the electrical angle of the other detection signals is determined. Relation between a detection signal and an electrical angle is stored in advance. Based on the determined electrical angle, and referring to the relation, the electrical angle of the other detection signal is obtained; thus, the rotational angle of the rotor is detected.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: April 10, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventor: Yoshitomo Tokumoto
  • Electric power steering apparatus
    Patent number: 7201075
    Abstract: An electric power steering apparatus having a displacing mechanism in which a fitting hole potion is provided to a gear housing for fitting with and holding a bearing to which a worm shaft for transmitting rotating force of a steering assisting motor to a steering shaft provided with a worm wheel is fitted, the portion being formed of a pair of split members formed by splitting the portion into two, one split member being movable toward the other split member to adjust a distance between a shaft center of the worm shaft and a rotation center of the worm wheel.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: April 10, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Takashi Tsutsui, Masayuki Watanabe
  • Pulley unit
    Patent number: 7201685
    Abstract: The present invention comprises a pulley, a shaft body which is rotatable relative to the pulley and is concentrically disposed radially inside of the pulley, a one-way clutch which is interposed at an annular space between the pulley and the shaft body, a rolling bearing which is disposed in the annular space adjacent to the one-way clutch in an axial direction, an inner annular seal which is provided outside the rolling bearing in the annular space, and an outer annular seal which is provided outside the inner annular seal and has a proximal end portion and a distal end side lip. The proximal end portion of the outer annular seal is fixed to one of an inner peripheral surface of the pulley and an outer peripheral surface of the shaft body, and the distal end side lip of the outer annular seal contacts the other peripheral surface.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: April 10, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Tadahiro Terada, Michiru Ueda, Yoshitaka Nakagawa, Hideki Fujiwara, Takahiro Ichihara
  • Cross joint
    Publication number: 20070077869
    Abstract: In a cross joint outwardly fitting a bearing cup to each of four pieces of shafts of a cross shaft member via a cylindrical member, race portions formed on a side of the cross shaft member and on a side of the bearing cup and a shoulder portion provided between respectives of neck portions of two of the shafts of the cross shaft member contiguous to each other are subjected to roller burnishing.
    Type: Application
    Filed: December 6, 2006
    Publication date: April 5, 2007
    Applicant: Koyo Seiko Co., Ltd.
    Inventors: Nobuo Komeyama, Mitsumasa Ozeki
  • Power steering device
    Patent number: 7199536
    Abstract: An electric power steering apparatus provides stable steering assist force by positively precluding actuation of an electric motor while it is rotating in a reverse direction, so as to prevent demagnetization of the electric motor. A motor reverse rotation detecting means detects whether or not the electric motor is rotating in the reverse direction and a motor actuation control actuates the electric motor when a condition for actuating the electric motor is fulfilled and on condition that the electric motor is not rotating in the reverse direction.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: April 3, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventor: Tetsuya Ozaki
  • Hub unit with sensor
    Patent number: 7197944
    Abstract: A sensor device including a resolver having a rotor provided on a rotation-side raceway member of a hub unit and a stator provided on a stationary-side raceway member of the unit, and a processing circuit for processing a signal to be output in accordance with an air gap between the stator and the rotor. The processing circuit has a wheel ground contact load calculating unit for determining the ground contact load on a wheel from the air gap between the stator and the rotor.
    Type: Grant
    Filed: December 26, 2003
    Date of Patent: April 3, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Katsura Koyagi, Masahiro Inoue
  • Vehicle control system
    Patent number: 7197387
    Abstract: Sensor-equipped hub units 34a attached to respective drive wheels 34 each have a sensor device comprising a sensor 36 for detecting the ground contact load on the wheel 34. A control unit 31 has a traction controller 32, whereby when the ground contact load value output from one of the ground contact load sensors 36 while the vehicle is traveling straight is outside a predetermined range, the drive wheel 34 is controlled so as to return the ground contact load value to the original value.
    Type: Grant
    Filed: July 2, 2003
    Date of Patent: March 27, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Masahiro Inoue, Katsura Koyagi, Kenji Sakamoto
  • One-way clutch unit
    Patent number: 7195110
    Abstract: There is provided a one-way clutch unit that is simple in structure and compact. An annular recess 67 is provided in an inner periphery of a side of a deep groove ball bearing portion 55 of a first inner ring 7 of a first one-way clutch 1, and an end portion on the side of a deep groove ball bearing portion 65 of a second one-way clutch 2 is disposed in the annular recess 67. Thereby, the dimension in an axial direction of the one-way clutch unit is reduced by a dimension in the axial direction of the second one-way clutch 2 that is disposed in the annular recess 67.
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: March 27, 2007
    Assignees: Koyo Seiko Co., Ltd., Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Takahiro Ichihara, Hajime Watanabe, Hideki Fujiwara, Minoru Mera, Taku Adaniya, Akinobu Kanai, Naoki Usui, Tomoharu Arai
  • Electric power steering apparatus
    Patent number: 7191866
    Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other and a belt tension adjuster.
    Type: Grant
    Filed: April 26, 2005
    Date of Patent: March 20, 2007
    Assignees: Koyo Seiko Co., Ltd., Gates Unitta Asia Company
    Inventors: Hiroto Sasaki, Takehiro Saruwatari, Kensaku Nakamura, Atsuya Miyata, Kazuaki Nagamatsu, Kunihiro Oka, Hiroshi Murataka, Akihiro Hironaka
  • Cross shaft joint
    Patent number: 7192356
    Abstract: A cross shaft joint tiltably coupling two shaft members each other includes: a cross shaft which includes four shaft portions and is arranged between the two shaft members; outer ring cups rotatably provided to the four shaft portions, respectively, the outer ring cups being adapted to be coupled to corresponding shaft members; and an attachment portion to which a balance weight for balancing the outer ring cups can be attached is formed on at least one of the outer ring cups.
    Type: Grant
    Filed: March 17, 2004
    Date of Patent: March 20, 2007
    Assignees: Koyo Seiko Co., Ltd., Koyo Machine Industries Co., Ltd.
    Inventors: Nobuo Komeyama, Mitsumasa Ozeki
  • Eccentric thrust bearing assembly and a wheel with built-in suspension using the same
    Publication number: 20070057480
    Abstract: An eccentric thrust bearing assembly mounted in a wheel with built-in suspension including: an outside wheel member including a rim portion to which a tire is mounted; an inside wheel member including a disk portion coupled with an axle; and an elastic member interposed between the outside wheel member and the inside wheel member, the bearing assembly permitting an eccentric relative movement between the wheel members while bearing an axial load applied between the wheel members.
    Type: Application
    Filed: May 7, 2004
    Publication date: March 15, 2007
    Applicants: Koyo Seiko Co., Ltd., Topy Industries, Ltd.
    Inventors: Seiji Tada, Tadashi Imamura
  • Rocker arm and method of manufacturing the same
    Patent number: 7185619
    Abstract: A rocker arm 1 made of sheet metal is formed so that Vickers hardness Hv of the surface layer portion 9a of the valve stem receiver 9 is set at Hv 650 to 800 and a quantity of the retained austenite ?R is set at 25 to 35 vol %.
    Type: Grant
    Filed: January 12, 2005
    Date of Patent: March 6, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventor: Nobutsuna Motohashi
  • Steering system release device for a vehicle with electric power steering
    Patent number: 7178624
    Abstract: A device that is used for the automatic release, without any manual effort, of the steering system in a motor vehicle comprising electric power steering and a locking mechanism which acts on the steering column or on another part of the steering system. A controller, which is connected to an electric assist motor, receives signals from at least one vehicle status and/or initiating event detector and controls the motor in order to rotate the steering column or move another part of the steering system until the torque or stress on the locking mechanism is cancelled or reduced to almost zero, thereby enabling said mechanism to be released. The control of the motor is automatically interrupted at the end of a pre-determined period of time if the mechanism has not been released.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: February 20, 2007
    Assignee: Koyo Steering Europe (K.S.E.)
    Inventor: Vincent Clapeau
  • Rolling bearing
    Patent number: 7178986
    Abstract: In a rolling bearing including a cage arranged in an annular space between an outer ring and an inner ring, a plurality of rolling elements held by the cage, and a solid lubricating agent provided in the cage, the cage has a plurality of rolling element receiving pockets in a circumferential direction, and has recess portions between the rolling element receiving pockets in a circumferential direction, and each of the rolling elements is received in each of the rolling element receiving pockets. The solid lubricating agent is attached to the recess portions in such a manner as to be in a slidable contact with a rolling element raceway surface.
    Type: Grant
    Filed: February 12, 2003
    Date of Patent: February 20, 2007
    Assignee: Koyo Seiko Co., Ltd.
    Inventors: Masaaki Ohtsuki, Shinji Fukuda, Hiroyuki Urano, Hiroshi Ueno, Thomas Grabosch, Antonet Wijnen
  • Elastic support assembly for electric power steering apparatus
    Patent number: 7177744
    Abstract: An elastic support assembly for an electric power steering apparatus in which a worm shaft is supported movably in a rotation axis direction through the elastic support assembly includes: a pair of first and second members relatively moving in the rotation axis direction according to a movement of the worm shaft; an elastic body provided between the first and second members in the rotation axis direction; and a cover which covers an outer periphery part of the elastic body from a radial direction of the worm shaft and is connected to the first member.
    Type: Grant
    Filed: February 12, 2004
    Date of Patent: February 13, 2007
    Assignee: Koyo Seiko Co., Ltd
    Inventors: Hajime Tanaka, Hisatake Yamada, Norihisa Nishikawa, Hideo Kometani