Patents by Inventor Hirokazu Wakao

Hirokazu Wakao 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).

  • Electric motor for power steering device
    Patent number: 6268669
    Abstract: An electric motor 10 for an electric power steering system, in which a board mounting portion 23 of aluminum for partitioning an electric motor body 10A and a circuit board 40 is formed all over the inner side of a motor case 20 and in which a bearing 25 of an output shaft 11 of the electric motor body 10A is supported on the board mounting portion 23 to release the heat effectively from FETs 43 mounted on the circuit board 40 and the output shaft 11. On the other hand, pigtail wires 36 from brushes 33 are welded to brush leads 27 having a wide surface area so that the circuit board 40 may be prevented from rising to a high temperature at the welding time.
    Type: Grant
    Filed: May 18, 2000
    Date of Patent: July 31, 2001
    Assignee: Kayaba Kogyo Kabushiki Kaisha
    Inventors: Hirokazu Wakao, Akira Endo, Takenobu Nakamura, Wataru Kawaguchi
  • Motorized power steering control device
    Patent number: 6035960
    Abstract: A motorized power steering control device capable of reducing arrangement of an external wiring and simplifying a travel condition detecting unit, to thereby reduce a manufacturing cost of the device. A controller has an alternator pulsation detecting circuit and a power circuit arranged therein. The power circuit selectively controls a main voltage or a backup voltage to apply it to a control circuit. The control circuit operates an engine speed depending on a pulsation frequency of an alternator, to thereby actuate the power circuit to apply the main voltage to the control circuit when the engine speed is at a predetermined level or above and apply the backup voltage thereto when it is at the predetermined level or below.
    Type: Grant
    Filed: January 2, 1996
    Date of Patent: March 14, 2000
    Assignee: Kayaba Industry Co., Ltd.
    Inventors: Hirokazu Wakao, Yoshinori Kogiso, Akira Endo
  • Arrangement of circuit casings and circuit boards in a power steering device
    Patent number: 5785145
    Abstract: An arrangement of circuit casings and circuit boards in a motorized power steering device including a drive circuit casing, a control circuit casing and a gear casing connected to the drive circuit casing. The drive circuit casing includes a drive circuit board provided thereon with a drive circuit whereas the control circuit casing includes a control circuit board provided thereon with a control circuit for outputting a control signal to the drive circuit. An electric motor is attached to the drive circuit casing such that the drive circuit casing is interposed between the gear casing and the electric motor.
    Type: Grant
    Filed: January 4, 1996
    Date of Patent: July 28, 1998
    Assignee: Kayaba Industry Co., Inc.
    Inventors: Hirokazu Wakao, Akira Endo, Yoshinori Kogiso