Patents by Inventor Tomoyoshi YOKOGAWA

Tomoyoshi YOKOGAWA 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: 20190091856
    Abstract: A transmission includes a first rotating portion, an eccentric body, a bearing, an external gear, an internal gear, carrier pins, and a second rotating portion. The first rotating portion rotates about a central axis. The eccentric body rotates therewith and a distance from the central axis to an outer surface thereof varies circumferentially. The bearing is provided on the eccentric body. The external gear includes through holes and is provided on the bearing. The internal gear is cylindrical, surrounds the central axis, and is disposed radially outside the external gear. The carrier pins are columnar and inserted into the through holes. The second rotating portion, to which upper portions of the carrier pins are fixed, rotates about the central axis. The external and internal gears have different numbers of teeth. The tooth of the external gear farthest from the central axis meshes with the internal gear. The diameters of the carrier pins decrease upward.
    Type: Application
    Filed: August 14, 2018
    Publication date: March 28, 2019
    Inventors: Shinji TAKEMOTO, Satoshi YAMANE, Tomoyoshi YOKOGAWA, Masaaki NAKAGAWA, Shigekatsu MATSUDA
  • Publication number: 20190089224
    Abstract: An actuator includes a rotary electric machine including a first rotating shaft rotatable in a circumferential direction about a central axis extending in one direction, and a transmission including a second rotating shaft that is rotatable in the circumferential direction to transfer rotation between the first rotating shaft and the second rotating shaft while changing the speed of the rotation. The rotary electric machine includes a rotor connected to the first rotating shaft, a stator outside of the first rotating shaft, and a casing that houses the rotor and the stator. The transmission includes an internal gear, an external gear to mesh with the internal gear, and a housing that houses the internal gear and the external gear. The actuator further includes a plate extending in an axial direction in which the central axis extends along outer surfaces of the casing and the housing to join the casing and the housing to each other.
    Type: Application
    Filed: September 6, 2018
    Publication date: March 21, 2019
    Inventors: Katsunobu HATANI, Masaaki NAKAGAWA, Tomoyoshi YOKOGAWA
  • Patent number: 9634533
    Abstract: A stationary portion of a motor includes resin bodies including an inner resin portion and an outer resin portion. The inner resin portion is between a tooth and a coil and between the tooth and an insulator. The outer resin portion covers circumferentially outer sides and axially outer sides of the coil. The inner and outer resin portions are continuous with each other through a connecting resin portion. The insulator includes an opening portion extending along circumferential side surfaces of the tooth. The inner resin portion is in contact with the circumferential side surfaces of the tooth and a conducting wire in the opening portion. Heat generated in the coil is transferred to the tooth through the resin body. A path along which the heat is transferred from the coil to the tooth is secured, and dissipation of heat out of the motor is promoted.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: April 25, 2017
    Assignee: NIDEC CORPORATION
    Inventors: Yoshihiro Uchitani, Yuji Tanaka, Tomoyoshi Yokogawa
  • Patent number: 9531222
    Abstract: A stationary portion of a motor includes a stator core, insulators, and coils. The stator core includes a core back having an annular shape, and a plurality of teeth extending radially inward from the core back. A radially inner end portion of each tooth has a circumferential width substantially equal to or smaller than a circumferential width of a remaining portion of the tooth. The core back includes a protruding portion protruding radially inward between adjacent teeth, a cut extending radially outward from the protruding portion, and a through hole extending in an axial direction through the core back defined at a radially outer end portion of the cut. The protruding portion increases a radial dimension of the core back to achieve a reduction in magnetic reluctance in the vicinity of the cut.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: December 27, 2016
    Assignee: NIDEC CORPORATION
    Inventors: Yoshihiro Uchitani, Yuji Tanaka, Tomoyoshi Yokogawa
  • Patent number: 9352408
    Abstract: A solder joint structure includes a metal pin in the shape of a prism or a circular or substantially circular cylinder; an aluminum wire including a wound portion wound around the metal pin; and a solder layer arranged to join the metal pin and at least one portion of the wound portion to each other. The at least one portion of the wound portion includes a deformed surface resulting from a partial disappearance or elimination of the aluminum wire in a cross-section perpendicular or substantially perpendicular to a direction in which the aluminum wire extends, and the solder layer is directly and closely adhered to the deformed surface.
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: May 31, 2016
    Assignee: NIDEC CORPORATION
    Inventor: Tomoyoshi Yokogawa
  • Patent number: 9154010
    Abstract: An armature includes an insulator mounted on a tooth portion around which a conducting wire is wound. A pair of a first member and a second member, which are combined so as to abut each other, is provided. The first member includes a first end wall which covers an upper side end in the axial direction of the tooth portion and a pair of first side walls which partially cover both side portions of the tooth portion. A first overlap portion is provided on a tip portion of the first side wall. A plurality of ribs extending so as to be parallel or substantially parallel to the winding direction of the conducting wire is disposed on an outer surface of the first overlap portion.
    Type: Grant
    Filed: December 17, 2011
    Date of Patent: October 6, 2015
    Assignee: Nidec Corporation
    Inventor: Tomoyoshi Yokogawa
  • Patent number: 9088191
    Abstract: An insulator of an armature includes an upper resin member and a lower resin member. Each of the upper and lower resin members includes decreased thickness portions. Axial positions of the decreased thickness portions of the upper and lower resin members are arranged to overlap at least partially with each other. Each of the upper and lower resin members further includes a rib arranged to project from a corresponding one of the decreased thickness portions. The rib improves the strength of the corresponding decreased thickness portion and reduces the likelihood that any of the decreased thickness portions of the upper and lower resin members will be damaged when the two members are fitted to each other.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: July 21, 2015
    Assignee: Nidec Corporation
    Inventor: Tomoyoshi Yokogawa
  • Patent number: 9000629
    Abstract: A stator segment arranged to define a portion of an annular stator includes a core segment including a core back portion arranged to extend in a circumferential direction of the stator, and a tooth portion arranged to extend from the core back portion in a radial direction of the stator; a coil wound around the tooth portion and including a pair of coil wire terminals; an insulating layer arranged between the coil and the tooth portion; and a resin layer arranged to seal the entire coil except for the pair of coil wire terminals. Circumferential end walls of the resin layer are arranged circumferentially inward of circumferential end walls of the core back portion.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: April 7, 2015
    Assignee: Nidec Corporation
    Inventors: Tomoyoshi Yokogawa, Airi Nakagawa
  • Publication number: 20150008769
    Abstract: A stationary portion of a motor includes resin bodies including an inner and outer resin portion arranged between a tooth and a coil and between the tooth and an insulator. The outer resin portion covers circumferentially outer sides and axially outer sides of the coil. The inner and outer resin portions are continuous with each other through a connecting resin portion. The insulator includes an opening portion arranged to extend along circumferential side surfaces of the tooth. The inner resin portion is arranged to contact the circumferential side surfaces of the tooth and a conducting wire in the opening portion. Heat generated in the coil is transferred to the tooth through the resin body such that a large area of a path along which the heat is transferred from the coil to the tooth is secured.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 8, 2015
    Applicant: NIDEC CORPORATION
    Inventors: Yoshihiro Uchitani, Yuji Tanaka, Tomoyoshi Yokogawa
  • Patent number: 8922080
    Abstract: A bus bar which electrically connects end portions of a plurality of conductive lines and a method for manufacturing the bus bar are such that an intermediate region of a single wire rod is folded to define a plurality of terminal forming portions extending to a lateral direction of the wire rod. The whole wire rod including the terminal forming portion is rolled. The rolled wire rod is bent into a certain shape.
    Type: Grant
    Filed: October 28, 2011
    Date of Patent: December 30, 2014
    Assignee: Nidec Corporation
    Inventors: Airi Nakagawa, Tomoyoshi Yokogawa, Tsuyoshi Hirokawa, Takahiro Hattori
  • Publication number: 20140346918
    Abstract: A stationary portion of a motor includes a stator core, insulators, and coils. The stator core includes a core back having an annular shape, and a plurality of teeth extending radially inward from the core back. A radially inner end portion of each tooth has a circumferential width substantially equal to or smaller than a circumferential width of a remaining portion of the tooth. The core back includes a protruding portion protruding radially inward between adjacent teeth, a cut extending radially outward from the protruding portion, and a through hole extending in an axial direction through the core back defined at a radially outer end portion of the cut. The protruding portion increases a radial dimension of the core back to achieve a reduction in magnetic reluctance in the vicinity of the cut.
    Type: Application
    Filed: September 14, 2012
    Publication date: November 27, 2014
    Applicant: NIDEC CORPORATION
    Inventors: Yoshihiro Uchitani, Yuji Tanaka, Tomoyoshi Yokogawa
  • Patent number: 8729755
    Abstract: An intermediate connection member which electrically connects an output terminal of a bus bar installed inside a motor case with an external connection terminal located in a distance from the output terminal. The intermediate connection member preferably includes both of a terminal member which is connected to the output terminal and a connecting line which is connected to the external connection terminal. The connecting line is defined by binding a plurality of wire rods together.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: May 20, 2014
    Assignee: Nidec Corporation
    Inventors: Airi Nakagawa, Tomoyoshi Yokogawa
  • Publication number: 20140126956
    Abstract: A solder joint structure includes a metal pin in the shape of a prism or a circular or substantially circular cylinder; an aluminum wire including a wound portion wound around the metal pin; and a solder layer arranged to join the metal pin and at least one portion of the wound portion to each other. The at least one portion of the wound portion includes a deformed surface resulting from a partial disappearance or elimination of the aluminum wire in a cross-section perpendicular or substantially perpendicular to a direction in which the aluminum wire extends, and the solder layer is directly and closely adhered to the deformed surface.
    Type: Application
    Filed: September 12, 2013
    Publication date: May 8, 2014
    Applicant: NIDEC CORPORATION
    Inventor: Tomoyoshi YOKOGAWA
  • Publication number: 20130257183
    Abstract: A stator portion of a molded motor includes a plurality of windings, a wiring board, and a resin arranged to cover at least a surface of each winding. The wiring board includes a through hole extending through the wiring board in an axial direction. The through hole is arranged axially opposite to any winding to facilitate discharge of air out of a gap between the wiring board and the winding during a molding process, while the distance between the wiring board and each opposed winding is short in the stator portion of the molded motor. The resin is thus continuously arranged in gaps between the windings and the gap between the wiring board and each opposed winding.
    Type: Application
    Filed: February 12, 2013
    Publication date: October 3, 2013
    Applicant: NIDEC CORPORATION
    Inventor: Tomoyoshi YOKOGAWA
  • Publication number: 20130221770
    Abstract: An armature includes an insulator mounted on a tooth portion around which a conducting wire is wound. A pair of a first member and a second member, which are combined so as to abut each other, is provided. The first member includes a first end wall which covers an upper side end in the axial direction of the tooth portion and a pair of first side walls which partially cover both side portions of the tooth portion. A first overlap portion is provided on a tip portion of the first side wall. A plurality of ribs extending so as to be parallel or substantially parallel to the winding direction of the conducting wire is disposed on an outer surface of the first overlap portion.
    Type: Application
    Filed: December 17, 2011
    Publication date: August 29, 2013
    Applicant: NIDEC CORPORATION
    Inventor: Tomoyoshi Yokogawa
  • Publication number: 20130181569
    Abstract: A bus bar which electrically connects end portions of a plurality of conductive lines and a method for manufacturing the bus bar are such that an intermediate region of a single wire rod is folded to define a plurality of terminal forming portions extending to a lateral direction of the wire rod. The whole wire rod including the terminal forming portion is rolled. The rolled wire rod is bent into a certain shape.
    Type: Application
    Filed: October 28, 2011
    Publication date: July 18, 2013
    Applicant: Nidec Corporation
    Inventors: Airi Nakagawa, Tomoyoshi Yokogawa, Tsuyoshi Hirokawa, Takahiro Hattori
  • Publication number: 20120293024
    Abstract: A stator segment arranged to define a portion of an annular stator includes a core segment including a core back portion arranged to extend in a circumferential direction of the stator, and a tooth portion arranged to extend from the core back portion in a radial direction of the stator; a coil wound around the tooth portion and including a pair of coil wire terminals; an insulating layer arranged between the coil and the tooth portion; and a resin layer arranged to seal the entire coil except for the pair of coil wire terminals. Circumferential end walls of the resin layer are arranged circumferentially inward of circumferential end walls of the core back portion.
    Type: Application
    Filed: February 28, 2011
    Publication date: November 22, 2012
    Applicant: NIDEC CORPORATION
    Inventors: Tomoyoshi Yokogawa, Airi Nakagawa
  • Publication number: 20120286593
    Abstract: A stator is compatible with a variety of wiring configurations and possesses excellent versatility, while also preventing an increase in the size of a busbar unit. The stator includes a plurality of stator segments joined together to assume a cylindrical shape. Each stator segment includes a core segment including a core back portion and a tooth portion; a coil including a pair of coil wire terminals; an insulating layer arranged between the coil and the tooth portion; and a resin layer arranged to have the entire coil except for the coil wire terminals embedded therein. The resin layers of the stator segments include a supporting structure defined therein to allow a wiring member to be connected with any of the coil wire terminals to be attached to and removed from the stator.
    Type: Application
    Filed: February 28, 2011
    Publication date: November 15, 2012
    Applicant: NIDEC CORPORATION
    Inventors: Tomoyoshi Yokogawa, Airi Nakagawa, Tsuyoshi Hirokawa
  • Publication number: 20120126646
    Abstract: An intermediate connection member which electrically connects an output terminal of a bus bar installed inside a motor case with an external connection terminal located in a distance from the output terminal. The intermediate connection member preferably includes both of a terminal member which is connected to the output terminal and a connecting line which is connected to the external connection terminal. The connecting line is defined by binding a plurality of wire rods together.
    Type: Application
    Filed: November 14, 2011
    Publication date: May 24, 2012
    Applicant: NIDEC CORPORATION
    Inventors: Airi NAKAGAWA, Tomoyoshi YOKOGAWA