Patents by Inventor Yasuo Shimizu

Yasuo Shimizu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8650969
    Abstract: A magnetostrictive torque sensor includes a rotation shaft, a magnetostrictive member, and a plurality of detectors. The rotation shaft is rotationally supported. The magnetostrictive member is disposed on a surface of the rotation shaft and being deformable in accordance with a magnitude of rotation torque applied to the rotation shaft to change magnetic permeability. The plurality of detectors are disposed on a periphery of the rotation shaft. Each of the detectors is configured to detect a change in magnetic permeability of the magnetostrictive member in a form of an electrical change. The detectors are configured to detect different amounts of electrical change from one another if amounts of change in deformation are same throughout the magnetostrictive member.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: February 18, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yutaka Arimura, Yasuo Shimizu, Takeshi Wakabayashi
  • Patent number: 8646352
    Abstract: Provided is a worm wheel that allows the residual stress in the plastic gear forming member thereof to be reduced, and suited for compact design. The worm wheel comprises a metallic core member (30) and a plastic gear forming member (20) formed on an outer periphery of the core member. In particular, the core member includes a boss portion (31) defining a pivot portion, an intermediate portion (32) extending radially from the outer periphery of the boss portion, and a cylindrical portion (33) connected to a radially outer end of the intermediate portion and having the gear forming member molded thereon coaxially with the boss, the cylindrical portion being formed with through holes (34) or cutouts (36) passed radially therethrough.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: February 11, 2014
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yosuke Tanaka, Yasuo Shimizu, Atsuhiko Yoneda
  • Patent number: 8584533
    Abstract: A magnetostrictive torque sensor device which detects a torque applied to a rotary shaft is provided. The magnetostrictive torque sensor device includes a magnetostrictive portion provided on a surface of the rotary shaft, a coil and a cylindrical back-yoke disposed in outer periphery of the coil. The coil includes a bobbin arranged in outer periphery of the magnetostrictive portion, and a wire wound around the bobbin. A slit is provided on the back-yoke.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: November 19, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takashi Miyoshi, Yoshihiro Oniwa, Yasuo Shimizu, Atsuhiko Yoneda, Yutaka Arimura, Katsuji Watanabe
  • Patent number: 8573352
    Abstract: As a quotient, which is produced when the value of an assistive current for causing an electric motor to generate an assistive torque is divided by the value of a steering torque detected by a steering torque sensor, becomes greater, a greater phase-lag compensation (smaller phase-lead compensation) is performed on the steering torque detected by the steering torque sensor. Within a region in which the steering sensation is reduced, a greater phase-lead compensation is performed.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: November 5, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Atsuhiko Yoneda
  • Patent number: 8556023
    Abstract: In an electric power steering apparatus, an elastic member, disposed between the steering shaft and the housing, configured to be elastically deformed in accordance with rotation or displacement in a vehicle width direction, of the steering shaft. At least two bearings, disposed with a gap in an axial direction of the steering shaft, are configured to support the steering shaft. The elastic member is disposed between the bearings. A supporting member may be disposed between the steering shaft and the elastic member and configured to be displaced by a rotation of a predetermined angle or predetermined distance in accordance with the rotation or a displacement, in the width direction of the vehicle, of the steering shaft with slidable support for the steering shaft. The elastic member is fixed to the supporting member and abuts the housing.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: October 15, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yasuo Shimizu, Atsuhiko Yoneda, Shigeru Yamawaki, Takehito Shiraishi
  • Publication number: 20130265057
    Abstract: A structure of mounting a current sensor to a battery cable includes a battery cable, a thermal fusion bonding tape wound around an outer circumference of the battery cable, and a current sensor. The current sensor includes a housing including a current detecting part configured to detect a current flowing through the battery cable, and a holder configured to hold and compress a thermal fusion bonding tape mounting portion in cooperation with the housing to deform a cross-sectional shape of the thermal fusion bonding tape mounting portion into an elliptical shape. The thermal fusion bonding tape mounting portion is a portion where the thermal fusion bonding tape is wound around the battery cable. Upon a compression between the housing and the holder being released, the elliptical shape of the cross-sectional shape of the thermal fusion bonding tape mounting portion is maintained.
    Type: Application
    Filed: April 3, 2013
    Publication date: October 10, 2013
    Applicant: YAZAKI CORPORATION
    Inventors: Yasuhiro SUGIMORI, Kunihiro HARADA, Yasuo SHIMIZU
  • Publication number: 20130199572
    Abstract: Ignition sections are provided at two locations on each of lower portions of the side surfaces on both sides of a film-forming chamber so as to be provided at four locations in total. A flowing current is applied to the ignition sections when a flammable by-product is ignited. A first detecting section for measuring a pressure in the film-forming chamber is formed on the side surface of the film-forming chamber. A second detecting section is formed at the lower portion of the side surface of the film-forming chamber. A third detecting section for measuring a spatial temperature in the film-forming chamber is formed at an upper portion of the film-forming chamber.
    Type: Application
    Filed: June 22, 2011
    Publication date: August 8, 2013
    Applicant: ULVAC, INC.
    Inventors: Takuro Hayashi, Kouji Sogabe, Koichi Matsumoto, Masanori Hashimoto, Kyuzo Nakamura, Munemoto Hagiwara, Hiroto Uchida, Katsuhiko Mori, Yasuo Shimizu, Moriaki Sakamoto
  • Patent number: 8479376
    Abstract: A method produces a magnetostrictive torque sensor which detects a steering torque applied to a steering shaft by electrically detecting distortion of magnetostrictive films provided on a surface of the steering shaft. A plating step forms the magnetostrictive film on the surface of the steering shaft, and a heat treatment step heat treats the magnetostrictive film on the steering shaft. During the heat treatment step, hydrogen in the magnetostrictive film is decreased so that a hydrogen desorbing peak around 120° C. disappears when the magnetostrictive film is heated after the heat treatment step.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: July 9, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yasuo Shimizu, Nagatsugu Mukaibou
  • Patent number: 8326489
    Abstract: The present invention discloses a controller of an electric power-assist steering system including a torque detector for detecting a torque applied with a steering wheel that steers a steering system; a steering status determining section for determining a steering status of either “turn” or “return” of a steering wheel; and a motor controlling unit for driving a motor in accordance with a target current value calculated based on at least a torque value from the torque detector and the steering status of either “turn” or “return” of the steering wheel from the steering status determining section, wherein the motor controlling unit sets a target current value right after a time when the steering status is switched between “turn” and “return” to be substantially equal to an actual current value right before a time when the steering status is switched between “turn” and “return”.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: December 4, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Shigeru Yamawaki, Kazushige Sugamata
  • Patent number: 8302492
    Abstract: A magnetostrictive torque sensor includes a rotatable shaft rotatably supported by bearings, a magnetostrictive film disposed on the surface of the rotatable shaft, and a detecting coil that detects a change in a magnetic property of the magnetostrictive film. A hollow cylindrical ring is press-fitted over and fixed to the rotatable shaft near the magnetostrictive film, for example, near the right end of the magnetostrictive film.
    Type: Grant
    Filed: April 6, 2010
    Date of Patent: November 6, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventor: Yasuo Shimizu
  • Publication number: 20120273293
    Abstract: As a quotient, which is produced when the value of an assistive current for causing an electric motor to generate an assistive torque is divided by the value of a steering torque detected by a steering torque sensor, becomes greater, a greater phase-lag compensation (smaller phase-lead compensation) is performed on the steering torque detected by the steering torque sensor. Within a region in which the steering sensation is reduced, a greater phase-lead compensation is performed.
    Type: Application
    Filed: April 19, 2012
    Publication date: November 1, 2012
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Atsuhiko Yoneda
  • Publication number: 20120271513
    Abstract: In the event of a failure of a first electric motor drive signal generator, e.g., the microcomputer, which generates a first electric motor drive signal for performing a feedback control, a second electric motor drive signal generator, e.g., a PWM signal generator, which is made up of discrete circuit components, directly converts a steering torque signal into a second electric motor drive signal. An electric motor, which generates the assistive steering force, is driven by the second electric motor drive signal.
    Type: Application
    Filed: April 20, 2012
    Publication date: October 25, 2012
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Atsuhiko YONEDA, Yasuo SHIMIZU, Yoshihiro ONIWA, Yukihiro WAKAKUMA, Takashi MIYOSHI
  • Patent number: 8294311
    Abstract: An electric motor having a rotation shaft includes a motor housing into which the electric motor is accommodated, at least one pair of rolling bearings positioned in the motor housing and rotatably supporting both ends of the rotation shaft, and a displacement restriction member provided inside the motor housing and restricting a displacement of the rolling bearing in an axial direction of the rolling bearing. Each rolling bearing includes an inner race, an outer race, and rolling elements rotatably supported between the inner race and the outer race. The inner race is press fitted without any gaps onto an outer peripheral surface of the rotation shaft, and the outer race is press fitted without any gaps into a bearing attachment portion provided inside the motor housing.
    Type: Grant
    Filed: March 6, 2007
    Date of Patent: October 23, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takashi Miyoshi, Yasuo Shimizu, Atsuhiko Yoneda, Katsuhiro Saito, Ryoji Toyofuku, Katsuji Watanabe
  • Publication number: 20120242054
    Abstract: A shock absorbing device for a rack and pinion type steering device includes a rack shaft, a rack housing, a stopper portion formed in an end part of the rack shaft, a stopper engaging portion provided on the rack housing to define a stroke end position for the rack shaft by engaging the stopper portion, a stepped portion formed on the rack shaft, a shoulder portion formed in an enlarged diameter portion of the rack housing, and a cylindrical elastic member fitted on the rack shaft such that the elastic member is pressed in the axial direction of the rack shaft by the stepped portion and the shoulder portion. The elastic member is formed with grooves on each of an outer circumferential surface and an inner circumferential surface thereof. Such shock absorbing device for a rack and pinion type steering device has a high shock absorbing capability.
    Type: Application
    Filed: September 24, 2010
    Publication date: September 27, 2012
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Takehito Shiraishi, Yasuo Shimizu, Takahiro Aoki
  • Publication number: 20120233860
    Abstract: Disclosed is a method of manufacturing a motorized power steering device wherein auxiliary torque generated by an electric motor (43) is added to a rotation shaft (24) via a speed reduction mechanism (44). This manufacturing method comprises a shaft mounting process wherein the rotation shaft (24) is rotatably mounted in a housing (51), and a speed reduction mechanism installing process wherein subsequent to the mounting of the shaft, the speed reduction mechanism (44) is installed on the rotation shaft (24).
    Type: Application
    Filed: August 27, 2010
    Publication date: September 20, 2012
    Applicant: HONDA MOTOR CO., LTD
    Inventors: Atsuhiko Yoneda, Yasuo Shimizu
  • Publication number: 20120232759
    Abstract: An electric power steering device wherein mechanical friction is electrically provided. A steering torque value is detected by a steering torque sensor according to the operation of a steering wheel. An assist current value is calculated by an assist control section on the basis of the steering torque value. A target current value based on the assist current value is determined. For providing friction to the operation of the steering wheel, a friction control section and a friction torque value/current value conversion section generate a corrected steering torque value. A second corrected target current value is created by correcting a first corrected target current value by a friction current value. The corrected steering torque value is obtained by correcting the steering torque value by a friction torque value. The target current value is generated, resulting in a motor being subjected to driving control.
    Type: Application
    Filed: November 16, 2010
    Publication date: September 13, 2012
    Applicant: HONDA MOTOR CO., LTD
    Inventors: Yoshihiro Oniwa, Yasuo Shimizu, Shigeru Yamawaki, Kazushige Sugamata, Atsuhiko Yoneda
  • Publication number: 20120216645
    Abstract: Provided is a worm wheel that allows the residual stress in the plastic gear forming member thereof to be reduced, and suited for compact design. The worm wheel comprises a metallic core member (30) and a plastic gear forming member (20) formed on an outer periphery of the core member. In particular, the core member includes a boss portion (31) defining a pivot portion, an intermediate portion (32) extending radially from the outer periphery of the boss portion, and a cylindrical portion (33) connected to a radially outer end of the intermediate portion and having the gear forming member molded thereon coaxially with the boss, the cylindrical portion being formed with through holes (34) or cutouts (36) passed radially therethrough.
    Type: Application
    Filed: October 20, 2010
    Publication date: August 30, 2012
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Yosuke Tanaka, Yasuo Shimizu, Atsuhiko Yoneda
  • Publication number: 20120199414
    Abstract: An electric power steering apparatus includes a motor control unit for controlling an electric motor operatively connected to a steering shaft. The motor control unit includes a first control unit for controlling a steering torque detected by a torque detecting unit so as to bring the steering torque to zero or to a first predetermined value, and a second control unit for controlling the steering torque detected by the torque detecting unit so as to bring the steering torque to a second predetermined value which is greater than zero or than the first predetermined value, based on an operational quantity detected by an operational-quantity detecting unit or a quantity representative of a vehicle behavior detected by a vehicle-behavior detecting unit. The motor control unit controls the electric motor based on an output signal from the first control unit and an output signal from the second control unit.
    Type: Application
    Filed: January 25, 2012
    Publication date: August 9, 2012
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Yasuo SHIMIZU, Atsuhiko Yoneda, Shigeru Yamawaki, Yoshihiro Oniwa, Yukihiro Wakakuwa
  • Patent number: 8225483
    Abstract: The torque sensor includes a plurality of coil units having a substantially cylindrical shape, the coil units including a plurality of detection coils arranged to face a magnetic characteristic change portion formed on a rotary shaft. The coil units include a first coil unit and a second coil unit, and the first coil unit and the second coil unit are disposed in the axial direction of the shaft. The first coil unit and the second coil unit are fixed in an integrally molded resin. Thereby, there is provided a torque sensor having a high productivity and an easy configuration and a method of manufacturing the torque sensor.
    Type: Grant
    Filed: July 29, 2009
    Date of Patent: July 24, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Katsuji Watanabe, Yasuo Shimizu, Atsuhiko Yoneda, Tsunehiko Fukatsu
  • Patent number: 8201658
    Abstract: An electric power steering system includes a steering wheel, a rack-and-pinion type steering gear box connected to the steering wheel, a steering torque sensor, a pinion shaft, and a steering actuator mounted on the pinion shaft to assist a steering operation conducted by a driver. An overload preventing control is conducted so that a sum of a torque conversion value of an assist current and a steering torque detected by the steering torque sensor equal a predetermined threshold value. When the steering gear box has reached a stroke end, and the assist current or the steering torque is smaller than a predetermined threshold value, the overload preventing control is conducted using a threshold value that is less than the predetermined threshold value.
    Type: Grant
    Filed: June 10, 2011
    Date of Patent: June 19, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventor: Yasuo Shimizu