Patents by Inventor Koki Ueta

Koki Ueta 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: 6833646
    Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.
    Type: Grant
    Filed: January 8, 2004
    Date of Patent: December 21, 2004
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Kim Houng Joong, Kazuo Tahara, Kou Ajima, Koki Ueta, Toshiyuki Innami, Noriaki Hino, Taizo Miyazaki, Tomoyuki Hanyu, Kousaku Ohno
  • Publication number: 20040189128
    Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.
    Type: Application
    Filed: January 8, 2004
    Publication date: September 30, 2004
    Inventors: Kim Houng Joong, Kazuo Tahara, Kou Ajima, Koki Ueta, Toshiyuki Innami, Noriaki Hino, Taizo Miyazaki, Tomoyuki Hanyu, Kousaku Ohno
  • Patent number: 6577022
    Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: June 10, 2003
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Kim Houng Joong, Kazuo Tahara, Kou Ajima, Koki Ueta, Toshiyuki Innami, Noriaki Hino, Taizo Miyazaki, Tomoyuki Hanyu, Kousaku Ohno
  • Publication number: 20030102674
    Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.
    Type: Application
    Filed: January 23, 2003
    Publication date: June 5, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Kim Houng Joong, Kazuo Tahara, Kou Ajima, Koki Ueta, Toshiyuki Innami, Noriaki Hino, Taizo Miyazaki, Tomoyuki Hanyu, Kousaku Ohno
  • Patent number: 6462430
    Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.
    Type: Grant
    Filed: September 1, 2000
    Date of Patent: October 8, 2002
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Kim Houng Joong, Kazuo Tahara, Kou Ajima, Koki Ueta, Toshiyuki Innami, Noriaki Hino, Taizo Miyazaki, Tomoyuki Hanyu, Kousaku Ohno
  • Publication number: 20020100624
    Abstract: A hybrid drive type vehicle having a permanent magnet type synchronous motor can provide high torque characteristics in low revolution speed range of the engine and high power generation characteristics at high revolution speed range of the engine. The hybrid drive type vehicle includes an electric rotary machine being formed with a stator and a rotor. A field magnet of the rotor include a first field magnet and a second field magnet. The first and second field magnets are opposing with a magnetic pole of the stator and having a mechanism for varying a phase of a magnetic pole resulting from combination of the first and second field magnets relative to the magnetic pole of the first field magnet depending upon direction of a torque of the rotor.
    Type: Application
    Filed: March 21, 2002
    Publication date: August 1, 2002
    Applicant: Hitachi, Ltd. and Hitachi Car Engineering Co., Ltd
    Inventors: Kim Houng Joong, Kazuo Tahara, Kou Ajima, Koki Ueta, Toshiyuki Innami, Noriaki Hino, Taizo Miyazaki, Tomoyuki Hanyu, Kousaku Ohno
  • Patent number: 6378479
    Abstract: In a starter, durability of a pinion and a ring gear is to be improved by eliminating such as a collision by bringing them in mesh with each other. A rotatable intermediate shaft (for example, an input shaft of a generator) is interposed between an output shaft of a starter motor and a crankshaft, a ring gear is mounted on this intermediate shaft via a bearing, the ring gear and a pinion are normally brought in mesh with each other. A movable clutch element for coupling and releasing of the coupling between the intermediate shaft and the ring gear is fitted by a spline to the intermediate shaft, and a stationary clutch element is provided on the ring gear. When a starting switch 1 is turned ON, the clutch element is moved on a side of the ring gear by means of a lever and when the starting switch is turned OFF, the clutch element is separated from the ring gear. The intermediate shaft and the crankshaft are coupled with each other via pulleys and a belt.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: April 30, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Keisuke Nishidate, Koki Ueta, Shigeru Yumiyama
  • Patent number: 5617758
    Abstract: In a permanent magnet starter, a pinion clutch is smoothly engaged with a rotating shaft of an electric motor through a helical spline. A rotation restraint member is arranged at an outer periphery portion and this rotation restraint member is forcibly arranged by a magnetic field coil which is controlled from an outside portion. In a permanent magnet type motor having no magnetic field coil for exciting the motor, it is unnecessary to alter a motor unit. By the rotation force of an armature a pinion gear of the pinion clutch is moved, accordingly the permanent magnet starter for reducing the collision force during the meshing time of the pinion gear to a ring gear can be obtained. Further the permanent magnet starter having a superior gear meshing withstanding property and further without the lowering in the sealing property in the motor unit can be obtained.
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: April 8, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Tatsumi Nishida, Koki Ueta, Yasuhiko Maruhashi
  • Patent number: 5276073
    Abstract: A thermosetting resin composition useful for slot insulation purposes is disclosed, which includes:a liquid epoxy resin;a curing agent including an acid anhydride;a maleimide resin in an amount of 3-50 parts by weight per 100 parts by weight of the liquid epoxy resin; andfinely divided wollastonite in an amount of 50-400 parts by weight per 100 parts by weight of the liquid epoxy resin.
    Type: Grant
    Filed: August 6, 1992
    Date of Patent: January 4, 1994
    Assignees: Somar Corporation, Hitachi, Ltd.
    Inventors: Ichiro Akutagawa, Kunimitsu Matsuzaki, Toshio Matsuo, Ryuichi Fujii, Satoru Umeki, Yoshimichi Ono, Takeo Miyamoto, Koki Ueta, Naoki Kamada
  • Patent number: 5179864
    Abstract: A contaminant proof structure for a starter for an engine, with the starter including a sliding portion between a sliding member and a support member supporting the sliding member disposed in a housing so that the sliding member can project into the outside of the housing through an opening formed in a wall of the housing. An atmospheric gas reservoir disposed in the housing between the support member and the wall of the housing around the opening, and a communication passage bypasses the sliding portion and communicates the atmospheric gas reservoir with an external atmospheric gas through a space at an opposite side of the support member to the atmospheric gas reservoir side. The sliding member is dimensioned such that a gap between the opening and the sliding member inserted in the opening is small.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: January 19, 1993
    Assignees: Hitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
    Inventors: Koki Ueta, Naoki Kamada, Hideo Mori, Suehiro Endo, Susumu Tajima