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).
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Publication number: 20220416616Abstract: 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: ApplicationFiled: April 26, 2022Publication date: December 29, 2022Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN CORPORATIONInventors: Katsuhide KITAGAWA, Akifumi KUROKAWA
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Patent number: 11271443Abstract: 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: GrantFiled: September 27, 2019Date of Patent: March 8, 2022Assignee: AISIN SEIKI KABUSHIKI KAISHAInventors: Takahiro Yoneda, Toshiya Sugiyama, Akifumi Kurokawa
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Publication number: 20200106315Abstract: 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: ApplicationFiled: September 27, 2019Publication date: April 2, 2020Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Takahiro Yoneda, Toshiya Sugiyama, Akifumi Kurokawa
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Patent number: 9806572Abstract: 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: GrantFiled: March 7, 2014Date of Patent: October 31, 2017Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN AW CO., LTD., AISIN SEIKI KABUSHIKI KAISHAInventors: Yoshitada Yamagishi, Yu Hirai, Tatsuhiko Mizutani, Masashi Matsumoto, Takashi Matsumoto, Shinya Sano, Taketo Takeuchi, Akifumi Kurokawa
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Publication number: 20160036276Abstract: 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: ApplicationFiled: March 7, 2014Publication date: February 4, 2016Applicants: 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
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Patent number: 8890385Abstract: 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: GrantFiled: February 2, 2012Date of Patent: November 18, 2014Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki KaishaInventors: Shinya Sano, Akifumi Kurokawa
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Patent number: 8803394Abstract: 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: GrantFiled: February 2, 2012Date of Patent: August 12, 2014Assignees: 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
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Publication number: 20120200193Abstract: 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: ApplicationFiled: February 2, 2012Publication date: August 9, 2012Applicants: 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
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Publication number: 20120200187Abstract: 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: ApplicationFiled: February 2, 2012Publication date: August 9, 2012Applicants: AISIN SEIKI KABUSHIKI KAISHA, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shinya SANO, Akifumi KUROKAWA