Patents by Inventor Tohru Yumoto
Tohru Yumoto 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: 20210203200Abstract: In the present invention a rotor core is formed by multiple divided cores that are separated from one another, and side core plates that link the outer circumferential ends of the divided cores in the circumferential direction. Slits into which magnets are inserted are maintained between the divided cores. The rotor core and a rotary shaft are coupled to one another by a molded resin, and the molded resin covers protrusions which are on both sides in the circumferential direction at the inner circumferential end of each divided core.Type: ApplicationFiled: March 17, 2017Publication date: July 1, 2021Applicant: MITSUBA CorporationInventors: Yuichi SHIONO, Masanori SATO, Hisashi ISHIDA, Tohru YUMOTO
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Patent number: 10734854Abstract: A rotor includes a rotary shaft having a non-magnetic body, a plurality of rotor cores, and a plurality of permanent magnets disposed between the plurality of rotor cores, wherein a concave section extending in an axial direction is formed in any one of the non-magnetic body and a base end of the rotor core, and a convex section fitted into the concave section is formed at the other, the concave section is formed by a key groove section and a dovetail groove section in communication with each other, the convex section is formed by a key section configured to fit into the key groove section and a dovetail protrusion configured to fit into the dovetail groove section, the key section and the dovetail protrusion being integrally formed with each other, and a gap is formed between the dovetail groove section and the dovetail protrusion in the circumferential direction.Type: GrantFiled: April 27, 2017Date of Patent: August 4, 2020Assignees: MITSUBA CORPORATION, HONDA MOTOR CO., LTD.Inventors: Yosuke Fujii, Tohru Yumoto, Taichi Yamamoto, Susumu Miyazaki
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Publication number: 20170317543Abstract: A rotor includes a rotary shaft having a non-magnetic body, a plurality of rotor cores, and a plurality of permanent magnets disposed between the plurality of rotor cores, wherein a concave section extending in an axial direction is formed in any one of the non-magnetic body and a base end of the rotor core, and a convex section fitted into the concave section is formed at the other, the concave section is formed by a key groove section and a dovetail groove section in communication with each other, the convex section is formed by a key section configured to fit into the key groove section and a dovetail protrusion configured to fit into the dovetail groove section, the key section and the dovetail protrusion being integrally formed with each other, and a gap is formed between the dovetail groove section and the dovetail protrusion in the circumferential direction.Type: ApplicationFiled: April 27, 2017Publication date: November 2, 2017Inventors: Yosuke FUJII, Tohru YUMOTO, Taichi YAMAMOTO, Susumu MIYAZAKI
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Patent number: 7884520Abstract: A brushless motor according to the present invention is provided with a tubular stator case, a stator core fitted into the stator case, and a rotor rotatably supported via a bearing inside the stator core. The stator core includes a tubular yoke portion and a plurality of split cores which are detachably mounted on the tubular yoke portion. A plurality of commutating-pole teeth which extend radially inward are integrally formed on an inner peripheral surface of the tubular yoke portion at regular intervals in the peripheral direction of the tubular yoke portion; and a root portion of each of the commutating-pole teeth has inclined shoulders which are gradually enlarged radially outward.Type: GrantFiled: November 4, 2008Date of Patent: February 8, 2011Assignees: Mitsuba Corporation, Honda Motor Co., Ltd.Inventors: Hisashi Ishida, Tohru Yumoto, Masaki Ishizeki, Susumu Miyazaki, Kazushi Hamaya
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Patent number: 7781928Abstract: A brushless motor according to the present invention is provided with: a tubular stator case; a stator core fitted into the stator case; and a rotor rotatably supported via a bearing inside the stator core, wherein: an inner flange portion which extends radially inward is formed at a peripheral edge of an opening of one end of the stator case; and a bracket is fixed to the inner flange portion while contacting therewith so as to close the opening.Type: GrantFiled: November 4, 2008Date of Patent: August 24, 2010Assignee: Honda Motor Co., Ltd.Inventors: Tohru Yumoto, Masaki Ishizeki, Hisashi Ishida, Susumu Miyazaki, Kazushi Hamaya, Yuichi Uebayashi
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Patent number: 7732969Abstract: A brushless motor according to the present invention is provided with: a tubular stator case; a stator core; and a rotor. The stator core includes a tubular yoke portion and a plurality of split cores. A plurality of dovetail grooves are formed in an inner peripheral surface of the yoke portion; each split core has a coil bobbin which has a mounting hole so as to penetrate in a radial direction, and a split teeth which is mounted into the mounting hole of the coil bobbin. The coil bobbin has a winding portion, and flange portions, and a clearance portion into which a winding starting end of the coil is strayed from the winding portion is formed on the inside of the one of the flange portions by reducing the thickness of the flange portion such that.Type: GrantFiled: November 4, 2008Date of Patent: June 8, 2010Assignee: Honda Motor Co., Ltd.Inventors: Masaki Ishizeki, Tohru Yumoto, Hisashi Ishida, Susumu Miyazaki, Kazushi Hamaya
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Patent number: 7663285Abstract: This brushless motor according to the present invention is provided with: a tubular stator case; a stator core; a rotor; a plurality of teeth which are integrally formed on an inner peripheral surface of the stator core; a coil bobbin mounted between the mutually adjacent teeth, which has a winding portion around which a coil is wound; a lead wire; and a wiring substrate which relays a connection between the lead wire and the coil, wherein: the coil bobbin has flange portions; one of the flange portions which is located on the inward in the radial direction has an enlarged member which protrudes outward from the surface of the flange portion; a pair of terminals which is connected to the wiring substrate is provided on the enlarged portion so as to be located more inward than a tip of the tooth in the radial direction.Type: GrantFiled: November 4, 2008Date of Patent: February 16, 2010Assignee: Honda Motor Co., Ltd.Inventors: Tohru Yumoto, Hisashi Ishida, Susumu Miyazaki, Kazushi Hamaya
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Publication number: 20090127953Abstract: A brushless motor according to the present invention is provided with: a tubular stator case; a stator core fitted into the stator case; and a rotor rotatably supported via a bearing inside the stator core, wherein: an inner flange portion which extends radially inward is formed at a peripheral edge of an opening of one end of the stator case; and a bracket is fixed to the inner flange portion while contacting therewith so as to close the opening.Type: ApplicationFiled: November 4, 2008Publication date: May 21, 2009Applicant: HONDA MOTOR CO., LTD.Inventors: Tohru YUMOTO, Masaki ISHIZEKI, Hisashi ISHIDA, Susumu MIYAZAKI, Kazushi HAMAYA, Yuichi UEBAYASHI
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Publication number: 20090127971Abstract: A brushless motor according to the present invention is provided with: a tubular stator case; a stator core; and a rotor. The stator core includes a tubular yoke portion and a plurality of split cores. A plurality of dovetail grooves are formed in an inner peripheral surface of the yoke portion; each split core has a coil bobbin which has a mounting hole so as to penetrate in a radial direction, and a split teeth which is mounted into the mounting hole of the coil bobbin. The coil bobbin has a winding portion, and flange portions, and a clearance portion into which a winding starting end of the coil is strayed from the winding portion is formed on the inside of the one of the flange portions by reducing the thickness of the flange portion such that.Type: ApplicationFiled: November 4, 2008Publication date: May 21, 2009Applicant: HONDA MOTOR CO., LTD.Inventors: Masaki ISHIZEKI, Tohru Yumoto, Hisashi Ishida, Susumu Miyazaki, Kazushi Hamaya
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Publication number: 20090127972Abstract: A brushless motor according to the present invention is provided with a tubular stator case, a stator core fitted into the stator case, and a rotor rotatably supported via a bearing inside the stator core. The stator core includes a tubular yoke portion and a plurality of split cores which are detachably mounted on the tubular yoke portion. A plurality of commutating-pole teeth which extend radially inward are integrally formed on an inner peripheral surface of the tubular yoke portion at regular intervals in the peripheral direction of the tubular yoke portion; and a root portion of each of the commutating-pole teeth has inclined shoulders which are gradually enlarged radially outward.Type: ApplicationFiled: November 4, 2008Publication date: May 21, 2009Applicants: MITSUBA Corporation, HONDA MOTOR CO., LTD.Inventors: Hisashi ISHIDA, Tohru Yumoto, Masaki Ishizeki, Susumu Miyazaki, Kazushi Hamaya
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Publication number: 20090127964Abstract: This brushless motor according to the present invention is provided with: a tubular stator case; a stator core; a rotore; a plurality of teeth which are integrally formed on an inner peripheral surface of the stator core; a coil bobbin mounted between the mutually adjacent teeth, which has a winding portion around which a coil is wound; a lead wire; and a wiring substrate which relays a connection between the lead wire and the coil, wherein: the coil bobbin has flange portions; one of the flange portions which is located on the inward in the radial direction has an enlarged member which protrudes outward from the surface of the flange portion; a pair of terminals which is connected to the wiring substrate is provided on the enlarged portion so as to be located more inward than a tip of the tooth in the radial direction.Type: ApplicationFiled: November 4, 2008Publication date: May 21, 2009Applicant: HONDA MOTOR CO., LTD.Inventors: Tohru Yumoto, Hisashi Ishida, Susumu Miyazaki, Kazushi Hamaya