Patents by Inventor Akifumi KUROKAWA

Akifumi KUROKAWA 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).

  • Publication number: 20220416616
    Abstract: A rotating electric machine includes a stator housed in a case, from which a power line is pulled out, and a temperature sensing element provided on the stator. The rotating electric machine includes a harness retainer that guides a wire harness that extends from the temperature sensing element, toward an inner circumferential wall of the case.
    Type: Application
    Filed: April 26, 2022
    Publication date: December 29, 2022
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN CORPORATION
    Inventors: Katsuhide KITAGAWA, Akifumi KUROKAWA
  • Patent number: 11271443
    Abstract: A rotor core for a rotary electric machine, includes: a shaft hole into which a shaft rotating about a rotation axis is inserted and fixed; an inner ring portion provided with the shaft hole therein and having an outer edge in a circular shape coaxial with the rotation axis; an outer ring portion coaxial with the rotation axis and disposed radially outward of the inner ring portion; a connection ring portion coaxial with the rotation axis and disposed between the inner and outer ring portions; inner ribs interconnecting the inner and connection ring portions and extending in a crossing direction to the rotation axis; and outer ribs interconnecting the connection and outer ring portions and extending in the crossing direction. The inner and outer ribs are disposed respectively in different phases in a peripheral direction of the connection ring portion.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: March 8, 2022
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Takahiro Yoneda, Toshiya Sugiyama, Akifumi Kurokawa
  • Publication number: 20200106315
    Abstract: A rotor core for a rotary electric machine, includes: a shaft hole into which a shaft rotating about a rotation axis is inserted and fixed; an inner ring portion provided with the shaft hole therein and having an outer edge in a circular shape coaxial with the rotation axis; an outer ring portion coaxial with the rotation axis and disposed radially outward of the inner ring portion; a connection ring portion coaxial with the rotation axis and disposed between the inner and outer ring portions; inner ribs interconnecting the inner and connection ring portions and extending in a crossing direction to the rotation axis; and outer ribs interconnecting the connection and outer ring portions and extending in the crossing direction. The inner and outer ribs are disposed respectively in different phases in a peripheral direction of the connection ring portion.
    Type: Application
    Filed: September 27, 2019
    Publication date: April 2, 2020
    Applicant: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Takahiro Yoneda, Toshiya Sugiyama, Akifumi Kurokawa
  • Patent number: 9806572
    Abstract: A rotor 14 includes a shaft having a coolant flow passage and a coolant supply port, a rotor core 24 fixed on the shaft and formed of laminated steel plates, and a magnet set 32 provided in the rotor core 24 to extend along an axial direction thereof. The rotor core 24 has a first flow passage 34 provided near the magnet to extend therealong and a second flow passage 36 that connects the coolant supply port 28 of the shaft 22 and the first flow passage 34, thereby constituting a coolant flow path. The second flow passage 36 is formed by overlapping second slits 37 formed in the respective steel plates at an axially intermediate region A of the rotor core 24, the formed position of the second slit 37 being different for each steel plate combined. The first flow passage 34 and the second flow passage 36 join at the axially intermediate region A of the rotor core 24.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: October 31, 2017
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD., AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Yoshitada Yamagishi, Yu Hirai, Tatsuhiko Mizutani, Masashi Matsumoto, Takashi Matsumoto, Shinya Sano, Taketo Takeuchi, Akifumi Kurokawa
  • Publication number: 20160036276
    Abstract: A rotor 14 includes a shaft having a coolant flow passage and a coolant supply port, a rotor core 24 fixed on the shaft and formed of laminated steel plates, and a magnet set 32 provided in the rotor core 24 to extend along an axial direction thereof. The rotor core 24 has a first flow passage 34 provided near the magnet to extend therealong and a second flow passage 36 that connects the coolant supply port 28 of the shaft 22 and the first flow passage 34, thereby constituting a coolant flow path. The second flow passage 36 is formed by overlapping second slits 37 formed in the respective steel plates at an axially intermediate region A of the rotor core 24, the formed position of the second slit 37 being different for each steel plate combined. The first flow passage 34 and the second flow passage 36 join at the axially intermediate region A of the rotor core 24.
    Type: Application
    Filed: March 7, 2014
    Publication date: February 4, 2016
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN SEIKI KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Yoshitada YAMAGISHI, Yu HIRAI, Tatsuhiko MIZUTANI, Masashi MATSUMOTO, Takashi MATSUMOTO, Shinya SANO, Taketo TAKEUCHI, Akifumi KUROKAWA
  • Patent number: 8890385
    Abstract: A rotor for a rotary electric machine has a plurality of magnetic poles provided at intervals in a circumferential direction of a rotor core, at an outer periphery of the rotor core. Each of the magnetic poles includes a central magnet, a pair of circumferential-direction magnets disposed on both sides of the central magnet in the circumferential direction such that a spacing between the pair widens towards an outer periphery of the rotor core, and low permeability regions provided in the vicinity of end portions of the central magnet in the circumferential direction, and having a permeability lower than a magnetic material of the rotor core. The rotor core is formed such that a width of a magnetic path entrance portion that is formed between a magnetic-pole inward side face of the circumferential-direction magnet and the adjacent low permeability region decreases towards an outer peripheral face of the rotor core.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: November 18, 2014
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
    Inventors: Shinya Sano, Akifumi Kurokawa
  • Patent number: 8803394
    Abstract: In a rotor for a rotary electric machine, a plurality of magnetic poles are provided in a radially outer portion of the rotor iron core, at intervals in the circumferential direction. Each magnetic pole includes a pair of permanent magnets disposed apart from each other in the circumferential direction, and a magnetic flux-restraining hole that is formed and extended radially inwardly between radially inner end portions of the permanent magnets and that restrains flow of magnetic flux. The magnetic flux-restraining hole is extended so as to project beyond a position of the radially inner end portions to a radially outer side, between the pair of permanent magnets.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: August 12, 2014
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha, Aisin AW Co., Ltd.
    Inventors: Shinya Sano, Ken Takeda, Tomohiro Inagaki, Shinichi Otake, Tsuyoshi Miyaji, Akifumi Kurokawa
  • Publication number: 20120200193
    Abstract: In a rotor for a rotary electric machine, a plurality of magnetic poles are provided in a radially outer portion of the rotor iron core, at intervals in the circumferential direction. Each magnetic pole includes a pair of permanent magnets disposed apart from each other in the circumferential direction, and a magnetic flux-restraining hole that is formed and extended radially inwardly between radially inner end portions of the permanent magnets and that restrains flow of magnetic flux. The magnetic flux-restraining hole is extended so as to project beyond a position of the radially inner end portions to a radially outer side, between the pair of permanent magnets.
    Type: Application
    Filed: February 2, 2012
    Publication date: August 9, 2012
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN SEIKI KABUSHIKI KAISHA, AISIN AW CO., LTD.
    Inventors: Shinya SANO, Ken TAKEDA, Tomohiro INAGAKI, Shinichi OTAKE, Tsuyoshi MIYAJI, Akifumi KUROKAWA
  • Publication number: 20120200187
    Abstract: A rotor for a rotary electric machine has a plurality of magnetic poles provided at intervals in a circumferential direction of a rotor core, at an outer periphery of the rotor core. Each of the magnetic poles includes a central magnet, a pair of circumferential-direction magnets disposed on both sides of the central magnet in the circumferential direction such that a spacing between the pair widens towards an outer periphery of the rotor core, and low permeability regions provided in the vicinity of end portions of the central magnet in the circumferential direction, and having a permeability lower than a magnetic material of the rotor core. The rotor core is formed such that a width of a magnetic path entrance portion that is formed between a magnetic-pole inward side face of the circumferential-direction magnet and the adjacent low permeability region decreases towards an outer peripheral face of the rotor core.
    Type: Application
    Filed: February 2, 2012
    Publication date: August 9, 2012
    Applicants: AISIN SEIKI KABUSHIKI KAISHA, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shinya SANO, Akifumi KUROKAWA