Patents by Inventor Yasuhiro Yamagata

Yasuhiro Yamagata 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: 10876615
    Abstract: A V surface of a pulley with which a metal element comes in contact includes first grooves extending spirally from a side of a rotation axis of the pulley to an outer side in a radial direction and one side in a circumferential direction, second grooves extending spirally to the outer side in the radial direction and the other side in the circumferential direction, and rhomboid protrusions surrounded thereby. An average circumferential width of the protrusions is smaller at a position on the inner side in the radial direction than at a position on the outer side in the radial direction. Therefore, at a position on the inner side in the radial direction of the V surface in which cracks easily occur, the average circumferential width of the protrusions is lower, such that cracks occurring on the protrusions are prevented by the grooves, and further extension of cracks is prevented.
    Type: Grant
    Filed: July 10, 2018
    Date of Patent: December 29, 2020
    Assignee: Honda Motor Co., Ltd.
    Inventors: Toru Yagasaki, Yasuhiro Yamagata
  • Patent number: 10675673
    Abstract: A method of manufacturing a mechanical part of the present invention includes a first process of forming, by performing a folding processing to an end portion of the material, a portion to be processed having a structure, in which a plurality of layers respectively having a thickness corresponding to a plate thickness of a material overlap each other, in the material such that a plate thickness direction of the layer is orthogonal to a plate thickness direction of the material; and a second process of changing, by performing a forging processing to the portion to be processed, a shape of the portion to be processed to a target shape while press-welding the layers of the portion to be processed to each other by plastic deformation.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: June 9, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Mitsuharu Yamagata, Shuji Yamamoto, Yasuhiro Wada
  • Patent number: 10637322
    Abstract: Provided is a brushed motor in which noise in a high rotational speed range is effectively decreased. A bar-shaped flat attachment 28 of synthetic resin is inserted along an axial line L into an opening of a slot 16 formed in a core 14 of a rotor 7, and fixed with respect to the core 14 and/or windings 17 using adhesive agent. The flat attachment 28 has side surfaces 28b and an inner peripheral surface 28c. The side surfaces 28b are engaged from an inner peripheral side with inclined surfaces 15a of teeth 15 adjacent to each other across the opening of the slot 16. The inner peripheral surface 28c of the flat attachment 28 has two ridges 28d protruding therefrom which are abutted against the windings 17. The flat attachment 28 closes the opening of the slot 16 and shapes an outer peripheral surface 14a of the core 14 into a flat cross sectional shape suitable for suppression of wind noise.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: April 28, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Yasuhiro Hashimoto, Hideyuki Uzawa, Yasuhiro Yamagata
  • Patent number: 10560007
    Abstract: A motor includes: a cylindrical housing that houses a rotor; a first member mounted to an opening of the housing; and a second member sandwiching the first member as mounted between the second member and the housing. The housing includes, at an end of the housing that faces the second member, a first locking part that locks a first locked part of the second member. The second member is elastically deformed by the first locking part and locked to the housing accordingly and is configured such that a gap is formed between the second member and the housing when the second member is locked to the housing.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: February 11, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Yasuhiro Yamagata, Isao Kubota
  • Patent number: 10510471
    Abstract: A composition for bonded magnets according to the present invention contains from 88% by mass to 91% by mass (inclusive) of a samarium-iron-nitrogen magnet powder having an average particle diameter of from 1.8 ?m to 2.8 ?m (inclusive), from 0.5% by mass to 2.5% by mass (inclusive) of a polyamide elastomer having a tensile elongation at break of 400% or more and a bending modulus of elasticity of 100 MPa or more, from 0.5% by mass to 2.0% by mass (inclusive) of carbon fibers having fiber diameters of from 10 ?m to 12 ?m (inclusive) and from 0.3% by mass to 1.0% by mass (inclusive) of a carboxylic acid ester, with the balance made up of a polyamide resin which is composed of a polyamide 12 having a weight average molecular weight (Mw) of from 4,500 to 7,500 (inclusive) as determined by molecular weight distribution measurement.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: December 17, 2019
    Assignees: SUMITOMO METAL MINING CO., LTD., MABUCHI MOTOR CO., LTD.
    Inventors: Hideki Matsuda, Kenji Muraoka, Toshiya Iwai, Junichi Ishii, Atsushi Kawamoto, Naoki Kitahara, Isao Shibuya, Yasuhiro Yamagata
  • Publication number: 20190321873
    Abstract: A press forming method includes a first process of obtaining a pressing force applied to each portion of a tool by an workpiece material during press forming while independently driving the respective each portion of the tool divided into multiple portions and press forming the workpiece material, and a second process of adjusting at least one of an applied driving force, an applied driving speed, and an applied driving timing for each portion of the tool to cause a processing portion of the workpiece material in which the state approaching an overload state is detected based on the pressing force to flow to other processing portions of the workpiece material.
    Type: Application
    Filed: June 28, 2019
    Publication date: October 24, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yasuhiro WADA, Shuji YAMAMOTO, Mitsuharu YAMAGATA
  • Patent number: 10376941
    Abstract: A press forming method includes a first process of obtaining a pressing force applied to each portion of a tool by an workpiece material during press forming while independently driving the respective each portion of the tool divided into multiple portions and press forming the workpiece material, and a second process of adjusting at least one of an applied driving force, an applied driving speed, and an applied driving timing for each portion of the tool to cause a processing portion of the workpiece material in which the state approaching an overload state is detected based on the pressing force to flow to other processing portions of the workpiece material.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: August 13, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yasuhiro Wada, Shuji Yamamoto, Mitsuharu Yamagata
  • Patent number: 10367383
    Abstract: A fixing structure for a permanent magnet includes: a cylindrical housing; a permanent magnet housed inside the housing; and an adhesive layer formed in a gap G between the housing and the permanent magnet and having an adhesive for fixing the permanent magnet to the housing. The adhesive layer is formed such that a filling rate of the adhesive is higher in the gap at another axial end of the permanent magnet than at one axial end of the permanent magnet. The permanent magnet is configured such that a density at said other axial end is higher than the density at said one axial end.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: July 30, 2019
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Yasuhiro Yamagata
  • Publication number: 20190048986
    Abstract: A V surface of a pulley with which a metal element comes in contact includes first grooves extending spirally from a side of a rotation axis of the pulley to an outer side in a radial direction and one side in a circumferential direction, second grooves extending spirally to the outer side in the radial direction and the other side in the circumferential direction, and rhomboid protrusions surrounded thereby. An average circumferential width of the protrusions is smaller at a position on the inner side in the radial direction than at a position on the outer side in the radial direction. Therefore, at a position on the inner side in the radial direction of the V surface in which cracks easily occur, the average circumferential width of the protrusions is lower, such that cracks occurring on the protrusions are prevented by the grooves, and further extension of cracks is prevented.
    Type: Application
    Filed: July 10, 2018
    Publication date: February 14, 2019
    Applicant: Honda Motor Co.,Ltd.
    Inventors: Toru YAGASAKI, Yasuhiro YAMAGATA
  • Publication number: 20180358862
    Abstract: Provided is a brushed motor in which noise in a high rotational speed range is effectively decreased. A bar-shaped flat attachment 28 of synthetic resin is inserted along an axial line L into an opening of a slot 16 formed in a core 14 of a rotor 7, and fixed with respect to the core 14 and/or windings 17 using adhesive agent. The flat attachment 28 has side surfaces 28b and an inner peripheral surface 28c. The side surfaces 28b are engaged from an inner peripheral side with inclined surfaces 15a of teeth 15 adjacent to each other across the opening of the slot 16. The inner peripheral surface 28c of the flat attachment 28 has two ridges 28d protruding therefrom which are abutted against the windings 17. The flat attachment 28 closes the opening of the slot 16 and shapes an outer peripheral surface 14a of the core 14 into a flat cross sectional shape suitable for suppression of wind noise.
    Type: Application
    Filed: May 23, 2018
    Publication date: December 13, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Yasuhiro HASHIMOTO, Hideyuki UZAWA, Yasuhiro YAMAGATA
  • Publication number: 20180138773
    Abstract: A rotor having a core with a novel configuration, where the rotor is provided with a first component having a plurality of teeth radially disposed about a rotating axis, a coil wound on the plurality of teeth, and a tubular second component fixed to the first component so as to connect distal ends of the plurality of teeth. The first component and the second component constitute a core. The second component has a multilayer structure of a plurality of laminated steel sheets.
    Type: Application
    Filed: October 26, 2017
    Publication date: May 17, 2018
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventor: Yasuhiro YAMAGATA
  • Publication number: 20170373571
    Abstract: A motor includes: a cylindrical housing that houses a rotor; a first member mounted to an opening of the housing; and a second member sandwiching the first member as mounted between the second member and the housing. The housing includes, at an end of the housing that faces the second member, a first locking part that locks a first locked part of the second member. The second member is elastically deformed by the first locking part and locked to the housing accordingly and is configured such that a gap is formed between the second member and the housing when the second member is locked to the housing.
    Type: Application
    Filed: November 24, 2015
    Publication date: December 28, 2017
    Inventors: Yasuhiro YAMAGATA, Isao KUBOTA
  • Publication number: 20170264150
    Abstract: A fixing structure for a permanent magnet includes: a cylindrical housing; a permanent magnet housed inside the housing; and an adhesive layer formed in a gap G between the housing and the permanent magnet and having an adhesive for fixing the permanent magnet to the housing. The adhesive layer is formed such that a filling rate of the adhesive is higher in the gap at another axial end of the permanent magnet than at one axial end of the permanent magnet. The permanent magnet is configured such that a density at said other axial end is higher than the density at said one axial end.
    Type: Application
    Filed: November 24, 2015
    Publication date: September 14, 2017
    Inventor: Yasuhiro Yamagata
  • Publication number: 20170178774
    Abstract: A composition for bonded magnets according to the present invention contains from 88% by mass to 91% by mass (inclusive) of a samarium-iron-nitrogen magnet powder having an average particle diameter of from 1.8 ?m to 2.8 ?m (inclusive), from 0.5% by mass to 2.5% by mass (inclusive) of a polyamide elastomer having a tensile elongation at break of 400% or more and a bending modulus of elasticity of 100 MPa or more, from 0.5% by mass to 2.0% by mass (inclusive) of carbon fibers having fiber diameters of from 10 ?m to 12 ?m (inclusive) and from 0.3% by mass to 1.0% by mass (inclusive) of a carboxylic acid ester, with the balance made up of a polyamide resin which is composed of a polyamide 12 having a weight average molecular weight (Mw) of from 4,500 to 7,500 (inclusive) as determined by molecular weight distribution measurement.
    Type: Application
    Filed: July 9, 2015
    Publication date: June 22, 2017
    Inventors: Hideki Matsuda, Kenji Muraoka, Toshiya Iwai, Junichi Ishii, Atsushi Kawamoto, Naoki Kitahara, Isao Shibuya, Yasuhiro Yamagata
  • Patent number: 9222547
    Abstract: A worm wheel (50) is structured integrally with an output shaft (52). The worm wheel (50) includes the output shaft (52), a circular flange (50a) with the output shaft (52) placed as the center, and teeth (50b) formed on the periphery of the flange (50a) and in mesh with a worm. The flange (50a) is provided with a first recessed flange portion (50c) opposite to the side of the output shaft (52), and the bottom (54) of the first recessed flange portion (50c) has a ring-shaped first planar portion (54a).
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: December 29, 2015
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Eiji Uenishi, Kazuyuki Yamamoto, Yasuhiro Yamagata, Kiyoto Itou
  • Patent number: 9193187
    Abstract: A media processing device moves a first printhead in a direction away from a first platen and sets the gap therebetween to a wide second gap until the magnetic ink character printing area of the recording medium passes the reading position. When this printing area on the recording medium passes the reading position A, the first printhead moves in the direction approaching the first platen, and the gap therebetween is reset to a first gap that is narrower than the second gap. Because the gap is wide during the magnetic ink character reading operation, the leading end of the recording medium when conveyed to a position passed the first printhead will not catch on the second printhead, and conveying the recording medium at a constant speed will not be impeded. The magnetic ink characters can therefore be accurately read.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: November 24, 2015
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Yasuhiro Yamagata
  • Patent number: 8721069
    Abstract: A printing method for printing bars in a barcode by forming dots on a print medium. The method includes dividing the bars of the barcode into a plurality of segments, forming the dots such that a portion of bars in a first segment are shifted a predetermined direction relative to a portion of bars in a second segment, and printing the barcode by forming dots in each of the plurality of segments. The predetermined direction can be towards a least significant digit of information represented by the barcode when the barcode is seen from the front. In one embodiment, the plurality of segments equals three. Other printing methods, as well as printers for performing the methods, are also provided.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: May 13, 2014
    Assignee: Seiko Epson Corporation
    Inventors: Yasuhiro Yamagata, Kunio Omura
  • Publication number: 20130000435
    Abstract: A worm wheel (50) is structured integrally with an output shaft (52). The worm wheel (50) includes the output shaft (52), a circular flange (50a) with the output shaft (52) placed as the center, and teeth (50b) formed on the periphery of the flange (50a) and in mesh with a worm. The flange (50a) is provided with a first recessed flange portion (50c) opposite to the side of the output shaft (52), and the bottom (54) of the first recessed flange portion (50c) has a ring-shaped first planar portion (54a).
    Type: Application
    Filed: March 3, 2011
    Publication date: January 3, 2013
    Applicant: MABUCHI MOTOR CO. LTD.
    Inventors: Eiji Uenishi, Kazuyuki Yamamoto, Yasuhiro Yamagata, Kiyoto Itou
  • Publication number: 20120268543
    Abstract: A printing method for printing bars in a barcode by forming dots on a print medium. The method includes dividing the bars of the barcode into a plurality of segments, forming the dots such that a portion of bars in a first segment are shifted a predetermined direction relative to a portion of bars in a second segment, and printing the barcode by forming dots in each of the plurality of segments. The predetermined direction can be towards a least significant digit of information represented by the barcode when the barcode is seen from the front. In one embodiment, the plurality of segments equals three. Other printing methods, as well as printers for performing the methods, are also provided.
    Type: Application
    Filed: July 6, 2012
    Publication date: October 25, 2012
    Inventors: Yasuhiro YAMAGATA, Kunio OMURA
  • Patent number: 8287198
    Abstract: A roll paper printer having a cover movable between an open and closed position with the printer having hooks on locking levers disposed to the cover to hold the cover in the locked position upon engaging pins located on the printer body side and having an opening lever to unlock the cover. The printer also includes a paper cutter device having a stationary knife which is attached to the cover and contact plate parts which extend from the stationary knife for contacting the front panel part on the printer body and having extension springs disposed in tension for pulling the stationary knife towards the back of the printer such that upon closing the cover the contact plate parts push the cover to the front of the printer. This causes the hooks of the locking levers to press from the back against the engagement pins to eliminate any play in the cover when in cover is in the locked position and to assist in opening the cover when the cover opening lever is operated.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: October 16, 2012
    Assignee: Seiko Epson Corporation
    Inventor: Yasuhiro Yamagata