Patents by Inventor Yoshichika Kawashima
Yoshichika Kawashima 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: 20240072605Abstract: A brushless motor includes a motor part and a gear part. The motor part includes: a rotating shaft, having a first gear; a rotor, having a bottom wall and a side wall, the bottom wall being fixed to the rotating shaft; magnets, fixed to the side wall and arranged side by side in a circumferential direction of the rotor; a stator, provided between the rotating shaft and the magnets in a radial direction of the rotor and wound with a coil; and a motor housing, rotatably supporting the rotating shaft, and accommodating the rotor and the stator. The gear part includes: a second gear, meshed with the first gear; an output shaft, having an output part, having a base end side thereof fixed to the second gear, and parallel to the rotating shaft; and a gear housing, rotatably supporting the output shaft, and accommodating the second gear.Type: ApplicationFiled: June 13, 2023Publication date: February 29, 2024Applicant: MITSUBA CorporationInventors: TEPPEI TOKIZAKI, Motoaki Kobayashi, Satoshi Tamura, Masaki Hayata, Masakazu Saito, Yoshichika Kawashima
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Publication number: 20240063689Abstract: A deceleration mechanism is provided with first and second gears, a first tooth part arranged in the first gear and extending spirally in an axial direction of the first gear, an engagement projected part arranged on the first tooth part, second tooth parts arranged on the second gear, and an engagement recessed part arranged between the adjacent second tooth parts. The engagement projected part is formed in an arc shape in a direction orthogonal to the axial direction of the first gear and has a curvature center eccentric from a rotation center of the first gear. The second tooth parts are inclined with respect to the axial direction of the first gear and arranged in a circumferential direction of the second gear. The engagement projected part is formed in an arc-shape in a direction orthogonal to the axial direction of the first gear and engaged with the engagement projected part.Type: ApplicationFiled: November 2, 2023Publication date: February 22, 2024Applicant: MITSUBA CorporationInventors: NAOKI KOJIMA, MOTOAKI KOBAYASHI, TEPPEI TOKIZAKI, Yoshichika KAWASHIMA
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Patent number: 11894753Abstract: A deceleration mechanism is provided with first and second gears, a first tooth part arranged in the first gear and extending spirally in an axial direction of the first gear, an engagement projected part arranged on the first tooth part, second tooth parts arranged on the second gear, and an engagement recessed part arranged between the adjacent second tooth parts. The engagement projected part is formed in an arc shape in a direction orthogonal to the axial direction of the first gear and has a curvature center eccentric from a rotation center of the first gear. The second tooth parts are inclined with respect to the axial direction of the first gear and arranged in a circumferential direction of the second gear. The engagement projected part is formed in an arc-shape in a direction orthogonal to the axial direction of the first gear and engaged with the engagement projected part.Type: GrantFiled: April 3, 2019Date of Patent: February 6, 2024Assignee: MITSUBA CorporationInventors: Naoki Kojima, Motoaki Kobayashi, Teppei Tokizaki, Yoshichika Kawashima
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Publication number: 20230258248Abstract: The disclosure provides a motor with a deceleration mechanism capable of suppressing disengagement of gears even when a large external force is applied to an output shaft. A backup member 70 maintaining engagement between a pinion gear 61 and a helical gear 62 is provided on a side of the pinion gear 61 opposite to the side of the helical gear 62 in a gear case 20. Thus, even when a large external force is applied to the output shaft, disengagement of the gears (disengagement of the pinion gear 61 and the helical gear 62) can be suppressed. Therefore, damage to the pinion gear 61 and the helical gear 62 (deceleration mechanism 60) can be prevented for a long period of time, and consequently the life of the motor 10 with the deceleration mechanism can be extended.Type: ApplicationFiled: December 5, 2022Publication date: August 17, 2023Applicant: MITSUBA CorporationInventors: TEPPEI TOKIZAKI, MOTOAKI KOBAYASHI, KUMIKO MASUBUCHI, TSUBASA ISHIZEKI, Yoshichika Kawashima
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Publication number: 20210021174Abstract: A deceleration mechanism is provided with first and second gears, a first tooth part arranged in the first gear and extending spirally in an axial direction of the first gear, an engagement projected part arranged on the first tooth part, second tooth parts arranged on the second gear, and an engagement recessed part arranged between the adjacent second tooth parts. The engagement projected part is formed in an arc shape in a direction orthogonal to the axial direction of the first gear and has a curvature center eccentric from a rotation center of the first gear. The second tooth parts are inclined with respect to the axial direction of the first gear and arranged in a circumferential direction of the second gear. The engagement projected part is formed in an arc-shape in a direction orthogonal to the axial direction of the first gear and engaged with the engagement projected part.Type: ApplicationFiled: April 3, 2019Publication date: January 21, 2021Applicant: MITSUBA CorporationInventors: Naoki KOJIMA, Motoaki KOBAYASHI, Teppei TOKIZAKI, Yoshichika KAWASHIMA
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Patent number: 10876595Abstract: A speed reducer-attached motor includes a rotation shaft on which a worm gear is provided and which is supported rotatably around a central axis via a plurality of bearings, a motor part that is driven to be rotated around the rotation shaft as a central axis, a speed reducer part that includes at least one or more gears which include a worm wheel that is engaged with the worm gear, and a casing on which a shaft accommodation groove that accommodates the rotation shaft, a bearing accommodation recess part that accommodates the bearing, and an accommodation recess part that accommodates the speed reducer part are formed, wherein the shaft accommodation groove, the bearing accommodation recess part, and the accommodation recess part open at a top surface portion side of the casing.Type: GrantFiled: June 15, 2017Date of Patent: December 29, 2020Assignee: Mitsuba CorporationInventors: Tomoyasu Sugiyama, Yoshichika Kawashima, Yosuke Harigai, Masaki Hayata
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Patent number: 10756584Abstract: In an electric motor (2) which includes four permanent magnets (12) and in which the number of teeth (20) and the number of slots (23) are set to 6, when a polar arc angle of the permanent magnet (12) is ?1, and a skew angle of the teeth (20) and the slots (23) is ?2, the polar arc angle ?1 and the skew angle ?2 are set so as to satisfy 50°??1<70° and 0°<?2?20°.Type: GrantFiled: April 25, 2016Date of Patent: August 25, 2020Assignee: Mitsuba CorporationInventors: Teppei Tokizaki, Yoshichika Kawashima, Natsumi Tamura
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Patent number: 10734858Abstract: When teeth (12) are allocated in a circumferential direction in sequence of a U phase, a V phase and a W phase, a forward wound coil wound on each of the phases is provided as a coil of the U phase, the V phase and the W phase, and a reverse wound coil wound on each of the phases is provided as the coil of a ?U phase, a ?V phase and a ?W phase, the coils are electrically connected between the neighboring segments in an order of the U phase, the ?W phase, the ?W phase, the V phase, the ?U phase, the ?U phase, the W phase, the ?V phase and the ?V phase, and the wire (14) drawn between the armature core (8) and the commutator (10) is drawn around the rotation shaft in the same direction.Type: GrantFiled: April 6, 2018Date of Patent: August 4, 2020Assignee: Mitsuba CorporationInventors: Yoshichika Kawashima, Teppei Tokizaki, Natsumi Tamura
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Patent number: 10615650Abstract: An electric motor includes a yoke having a cylindrical section, two pairs of permanent magnets disposed at an inner circumferential surface of the cylindrical section to oppose each other, and an armature rotatably supported further inside in a radial direction than the permanent magnets, wherein at least a pair of first flat sections opposing each other in the radial direction are formed at the cylindrical section, and the permanent magnets are disposed at positions distant from the first flat sections.Type: GrantFiled: October 16, 2017Date of Patent: April 7, 2020Assignee: Mitsuba CorporationInventors: Yoshichika Kawashima, Teppei Tokizaki, Naoki Kojima
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Patent number: 10404112Abstract: An electric motor includes a yoke having six magnetic poles; a rotary shaft which is provided inside the yoke in a freely rotatable manner; an armature core (6) which has teeth (36) attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots (37) formed between the teeth; an armature coil (7) which is wound around the teeth in a single wave winding; and a commutator (13) which is provided in the rotary shaft to be adjacent to the armature core (6) and has a plurality of circumferentially disposed segments (41) to which the armature coil (7) is connected.Type: GrantFiled: August 8, 2018Date of Patent: September 3, 2019Assignee: Mitsuba CorporationInventors: Yoshichika Kawashima, Teppei Tokizaki, Natsumi Tamura
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Publication number: 20190186596Abstract: A speed reducer-attached motor includes a rotation shaft on which a worm gear is provided and which is supported rotatably around a central axis via a plurality of bearings, a motor part that is driven to be rotated around the rotation shaft as a central axis, a speed reducer part that includes at least one or more gears which include a worm wheel that is engaged with the worm gear, and a casing on which a shaft accommodation groove that accommodates the rotation shaft, a bearing accommodation recess part that accommodates the bearing, and an accommodation recess part that accommodates the speed reducer part are formed, wherein the shaft accommodation groove, the bearing accommodation recess part, and the accommodation recess part open at a top surface portion side of the casing.Type: ApplicationFiled: June 15, 2017Publication date: June 20, 2019Inventors: Tomoyasu Sugiyama, Yoshichika Kawashima, Yosuke Harigai, Masaki Hayata
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Publication number: 20180351423Abstract: An electric motor includes a yoke having six magnetic poles; a rotary shaft which is provided inside the yoke in a freely rotatable manner; an armature core (6) which has teeth (36) attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots (37) formed between the teeth; an armature coil (7) which is wound around the teeth in a single wave winding; and a commutator (13) which is provided in the rotary shaft to be adjacent to the armature core (6) and has a plurality of circumferentially disposed segments (41) to which the armature coil (7) is connected.Type: ApplicationFiled: August 8, 2018Publication date: December 6, 2018Inventors: Yoshichika Kawashima, Teppei Tokizaki, Natsumi Tamura
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Patent number: 10075031Abstract: An electric motor includes a yoke having six magnetic poles; a rotary shaft which is provided inside the yoke in a freely rotatable manner; an armature core (6) which has teeth (36) attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots (37) formed between the teeth; an armature coil (7) which is wound around the teeth in a single wave winding; and a commutator (13) which is provided in the rotary shaft to be adjacent to the armature core (6) and has a plurality of circumferentially disposed segments (41) to which the armature coil (7) is connected.Type: GrantFiled: March 25, 2014Date of Patent: September 11, 2018Assignee: Mitsuba CorporationInventors: Yoshichika Kawashima, Teppei Tokizaki, Natsumi Tamura
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Publication number: 20180226853Abstract: When teeth (12) are allocated in a circumferential direction in sequence of a U phase, a V phase and a W phase, a forward wound coil wound on each of the phases is provided as a coil of the U phase, the V phase and the W phase, and a reverse wound coil wound on each of the phases is provided as the coil of a ?U phase, a ?V phase and a ?W phase, the coils are electrically connected between the neighboring segments in an order of the U phase, the ?W phase, the ?W phase, the V phase, the ?U phase, the ?U phase, the W phase, the ?V phase and the ?V phase, and the wire (14) drawn between the armature core (8) and the commutator (10) is drawn around the rotation shaft in the same direction.Type: ApplicationFiled: April 6, 2018Publication date: August 9, 2018Inventors: Yoshichika Kawashima, Teppei Tokizaki, Natsumi Tamura
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Publication number: 20180083501Abstract: In an electric motor (2) which includes four permanent magnets (12) and in which the number of teeth (20) and the number of slots (23) are set to 6, when a polar arc angle of the permanent magnet (12) is ?1, and a skew angle of the teeth (20) and the slots (23) is ?2, the polar arc angle ?1 and the skew angle ?2 are set so as to satisfy 50°??1<70° and 0°<?2?20°.Type: ApplicationFiled: April 25, 2016Publication date: March 22, 2018Applicant: Mitsuba CorporationInventors: Teppei Tokizaki, Yoshichika Kawashima, Natsumi Tamura
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Publication number: 20180041078Abstract: An electric motor includes a yoke having a cylindrical section, two pairs of permanent magnets disposed at an inner circumferential surface of the cylindrical section to oppose each other, and an armature rotatably supported further inside in a radial direction than the permanent magnets, wherein at least a pair of first flat sections opposing each other in the radial direction are formed at the cylindrical section, and the permanent magnets are disposed at positions distant from the first flat sections.Type: ApplicationFiled: October 16, 2017Publication date: February 8, 2018Inventors: Yoshichika Kawashima, Teppei Tokizaki, Naoki Kojima
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Patent number: 9837776Abstract: In an electric motor, a brush holder stay (33) has an opening section through which a commutator (23) is able to be inserted in a rotary shaft direction (O1), brush holders (41) extend in the rotary shaft direction (O1) and are formed in a flat spring shape biased toward the inside in a radial direction, base end sections of the brush holders (41) are supported by the brush holder stay (33) at intervals in a circumferential direction around the rotary shaft (3), and brushes (31) are held by the front end sections of the brush holders (41).Type: GrantFiled: July 10, 2014Date of Patent: December 5, 2017Assignee: Mitsuba CorporationInventors: Teppei Tokizaki, Yoshichika Kawashima, Natsumi Tamura
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Patent number: 9831728Abstract: An electric motor includes a yoke having a cylindrical section, two pairs of permanent magnets disposed at an inner circumferential surface of the cylindrical section to oppose each other, and an armature rotatably supported further inside in a radial direction than the permanent magnets, wherein at least a pair of first flat sections opposing each other in the radial direction are formed at the cylindrical section, and the permanent magnets are disposed at positions distant from the first flat sections.Type: GrantFiled: May 25, 2012Date of Patent: November 28, 2017Assignee: Mitsuba CorporationInventors: Yoshichika Kawashima, Teppei Tokizaki, Naoki Kojima
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Patent number: 9705380Abstract: An electric motor equipped with deceleration device (1) is provided with a main shaft component (200) that is formed substantially in a circular rod shape, and has one end portion (201) that is rotatably supported at a substantial center of a bottom portion (111) of a motor housing (110) and another end portion (202) that protrudes towards an outer side through an aperture in the motor housing (110), the main shaft component (200) is fixed to the motor housing (110) via the one end portion (201).Type: GrantFiled: December 10, 2012Date of Patent: July 11, 2017Assignee: Mitsuba CorporationInventors: Yuichi Nagase, Yoshichika Kawashima, Teppei Tokizaki
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Patent number: 9496771Abstract: An electric motor includes a yoke having a plurality of magnetic poles, a rotary shaft, an armature core (8) attached to the rotary shaft, the armature core (8) having a plurality of teeth (12) and slots (13), an armature coil (9) wound on the teeth (12) through an intensive winding method, a commutator having a plurality of segments (15) installed at the rotary shaft and disposed in a circumferential direction, a low speed brush (21a) and a high speed brush (21b) configured to supply power to the armature coil (9) via the segments (15), and a common brush (21c) commonly used in these brushes, wherein, when n is a natural number of 3 or more, a ratio of the numbers of magnetic poles, slots (13), and segments (15) is set to 2:3:3n.Type: GrantFiled: July 27, 2012Date of Patent: November 15, 2016Assignee: Mitsuba CorporationInventors: Yoshichika Kawashima, Teppei Tokizaki