Patents Assigned to Mabuchi Motor Co. Ltd.
  • Patent number: 9621004
    Abstract: An armature includes a core having a plurality of teeth, which are radially formed with a rotation axis as the center, a plurality of coils where each coil is wound around each set of teeth containing at least two teeth. The plurality of coils have a plurality of inside coils placed on a rotation axis side of the teeth and a plurality of outside coils placed outside the inside coils. The plurality of inside coils are circularly arranged so that inside coils adjacent to each other are not wound around the same tooth. The plurality of outside coils are circularly arranged so that outside coils adjacent to each other are not wound around the same tooth. The outside coils are wound around a second set of combinations of teeth, which are different from a first set of combinations of teeth around which the inside coils are wound.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: April 11, 2017
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Hiroshi Kimura, Takashi Muramoto, Hisashi Ogino
  • Patent number: 9570957
    Abstract: A gear box includes a gear box body of a reducer to which a motor is mounted. The gear box body includes a worm, wheel holding section where a worm wheel of the reducer is held, and a motor holding section, where a part of the motor is contained, the motor holding section having a motor mounting opening. The motor holding section is configured such that a bottom of the motor holding section is provided in a region between a line L1 and a line L2. Here, the line L1 passes through the center C of the worm wheel holding section and is perpendicular to the axis line X of a motor shaft. The line L2 is a tangent line passing through an outer edge portion located near a circular outer peripheral wall of the worm wheel holding section on a motor side and is perpendicular to the axis line X of the motor shaft.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: February 14, 2017
    Assignee: Mabuchi Motor Co., Ltd
    Inventors: Takashi Tamaki, Satoshi Kikuchi
  • Patent number: 9559555
    Abstract: A rotor includes: a circular rotor core; and a plurality of ? magnets. The ? magnets are contained in a magnet holding sections such that the same magnetic pole of one magnet as that of another magnet adjacent to said one magnet faces the same magnet pole of the adjacent magnet in circumferential directions of the rotor core. Given that the number of magnetic poles of the rotor is denoted by P, the maximum outside diameter of the rotor core is denoted by Dr [mm], and the thickness of the plate-like magnet in a circumferential direction of the rotor core is denoted by Lm [mm], the following inequality (2) is satisfied: 0.665×10?4×P2?0.28×10?2×P+0.577×10?1<(Lm/Dr)<3.38×10?4×P2?1.86×10?2×P+3.36×10?1??(2).
    Type: Grant
    Filed: July 21, 2015
    Date of Patent: January 31, 2017
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventor: Tadayuki Wakita
  • 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: 9188303
    Abstract: An automotive headlamp includes: a light source; a movable shade configured to be movable between a first position shielding a part of light emitted from the light source and a second position having a different light shielding volume; a motor configured to generate a driving force to move the shade from the first position to the second position; and a stopper for high beam to fix the movable shade, which has been moved from the first position to the second position, at the second position. The motor is configured such that a motor phase is lag when the motor moves the movable shade to the second position by the driving force generated by supplied power and fixes the same, and an electric current is applied to the motor when the movable shade is fixed at the second position.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 17, 2015
    Assignees: Mabuchi Motor Co., Ltd., Koito Manufacturing Co., Ltd.
    Inventors: Hiroshi Yamazaki, Noritaka Minakawa, Shoichiro Yokoi
  • Patent number: 9184526
    Abstract: A method for manufacturing a terminal that has electrical connection with a component by pinching and holding the component using a pinching part provided in a part of each of two arms. The method includes a first process of forming a first gap G1 between the two pinching parts, and a second process of plastically deforming a part of the arms so as to make the gap between the pinching parts to be a second gap G2 smaller than the first gap G1.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: November 10, 2015
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Takashi Tamaki, Kouichi Ueki, Akihiro Oosawa
  • Publication number: 20140346922
    Abstract: A motor includes a brush configured to contact a commutator and a movement restricting structure configured to restrict a movement of the brush. The movement restricting structure has: a carbon holder for housing the brush while permitting a movement of the brush in the commutator radial direction; and a circumferentially restricting part for restricting a movement of the brush in the commutator circumferential direction. The circumferentially restricting part has a passing port formed by punching, through which the brush passes.
    Type: Application
    Filed: May 23, 2014
    Publication date: November 27, 2014
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Atsushi Yoshida, Hisashi Ogino
  • Publication number: 20140210294
    Abstract: A rotor includes a circular rotor core, a plurality of ? magnets, and ring-shaped Z magnets. The rotor core has a plurality of magnet holding sections formed radially with a rotating shaft as the center. The ? magnets are contained in and held by the magnet holding sections such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core. The rotor core is such that N-poles and S-poles are alternately formed in a circumferential direction of an outer circumferential surface of the rotor core. The Z magnets are such that N-poles and S-poles are alternately formed circularly on an opposed face of the auxiliary magnet facing an end face of the rotor core in a direction of the rotating shaft.
    Type: Application
    Filed: January 29, 2014
    Publication date: July 31, 2014
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventor: Tadayuki Wakita
  • Publication number: 20140165760
    Abstract: A worm gear includes a worm formed with a through hole through which a shaft transmitting the rotation of a motor is inserted, and a worm wheel configured to mesh with the worm and transmit the rotation to an output shaft. Given that a normal pitch is denoted by E and a width of a recess in the direction of a worm axis by H, the worm is configured such that H/E?0.6 (1) is met.
    Type: Application
    Filed: February 19, 2014
    Publication date: June 19, 2014
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Kiyoto Itou, Kazuyuki Yamamoto
  • Publication number: 20140080366
    Abstract: A method for manufacturing a terminal that has electrical connection with a component by pinching and holding the component using a pinching part provided in a part of each of two arms. The method includes a first process of forming a first gap G1 between the two pinching parts, and a second process of plastically deforming a part of the arms so as to make the gap between the pinching parts to be a second gap G2 smaller than the first gap G1.
    Type: Application
    Filed: September 17, 2013
    Publication date: March 20, 2014
    Applicant: MABUCHI MOTOR CO., LTD.
    Inventors: Takashi TAMAKI, Kouichi UEKI, Akihiro OOSAWA
  • Patent number: 8633626
    Abstract: A DC motor comprises: a tubular metal case; a magnet that is provided along the inner surface of the metal case and has four or more of magnet poles in the circumferential direction; an armature that is arranged to face the magnet and composed of a core and a coil; and a shaft. The magnet is formed of a material with a maximum energy product BHmax of 3 to 6 MGOe. When the thickness of the magnet in the radial direction of the armature is indicated by T [mm] and the outer diameter of the core is indicated by d [mm], the ratio T/d of the thickness T of the magnet to the outer diameter d of the core is 0.16 or more.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: January 21, 2014
    Assignee: Mabuchi Motor Co. Ltd.
    Inventor: Yusuke Miyajima
  • Publication number: 20130258695
    Abstract: An automotive headlamp includes: a light source; a movable shade configured to be movable between a first position shielding a part of light emitted from the light source and a second position having a different light shielding volume; a motor configured to generate a driving force to move the shade from the first position to the second position; and a stopper for high beam to fix the movable shade, which has been moved from the first position to the second position, at the second position. The motor is configured such that a motor phase is lag when the motor moves the movable shade to the second position by the driving force generated by supplied power and fixes the same, and an electric current is applied to the motor when the movable shade is fixed at the second position.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicants: Koito Manufacturing Co., Ltd., MABUCHI MOTOR CO., LTD.
    Inventors: Hiroshi Yamazaki, Noritaka Minakawa, Shoichiro Yokoi
  • Patent number: 8513846
    Abstract: The present invention enables firm fixation between a motor casing and a casing lid at low cost through employment of a simple structure without need to use adhesive. A casing lid made of resin is fixedly fitted to an opening portion of a motor casing made of metal. Grooves or depressions are provided at the bottoms of a plurality of fixation portions provided on the casing lid at constant intervals in the circumference direction thereof. Bend portions at the opening portion of the motor casing are caused to bite into the grooves or depressions of the casing lid fitted into the opening portion of the motor casing, whereby the motor casing and the casing lid are fixed together.
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: August 20, 2013
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Hisashi Ogino, Mitsushi Kinoshita
  • Patent number: 8471553
    Abstract: A magnetic path is formed, in response to the rotation of a motor, by a magnetic detector (24 or 26) (more exactly, a magnetic wire (70)), a magnetic pole of the magnet (22), which is placed counter to each magnetic detector, and the rotating shaft (20). The magnetic wire (70) is formed of a magnetic material capable of causing a large Barkhausen jump. Whenever the magnetic pole opposite each magnetic element changes in response to the rotation of the motor, the direction of magnetic field constituting the magnetic path changes precipitously and a pulse signal in response to the change is outputted from the magnetic detector. Since the direction of magnetization of the magnetic wire (70) changes with a change in magnetic flux density received from a magnet (22), an induced electromotive force occurs due to a change in magnetic flux received by a detection coil. This makes enables the magnetic detector to output pulse signals without power supply.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: June 25, 2013
    Assignee: Mabuchi Motor Co. Ltd.
    Inventor: Toru Tategami
  • Patent number: 8456055
    Abstract: A core block has an arm portion, and a yoke portion extending circumferentially at an end of the arm portion. At least the yoke portion is configured such that a plurality of core segments are stacked in multiple levels in an axial or radial direction. Each of the core blocks has engaging portions formed at respective opposite ends of the yoke portion and adapted to connect adjacent core blocks. In a first-level core segment, each of the engaging portions has a protrusion extending circumferentially from a corresponding one of the opposite ends of the yoke portion, and a recess juxtaposed radially to the protrusion and adapted to receive the protrusion of an adjacent core block. In a second-level core segment, each of the engaging portions has the protrusion and the recess provided in positionally reversed relation with those of the first-level core segment with respect to the radial direction.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: June 4, 2013
    Assignee: Mabuchi Motor Co., Ltd.
    Inventor: Nobuo Kinoshita
  • Patent number: 8368280
    Abstract: A case lid assembly is formed by integrally fitting a brush holder formed of resin and a terminal holder formed of resin to opposite sides of a metal plate which supports a bearing. The brush holder supports a pair of brush bases. The terminal holder supports a PTC element and a pair of electrically conductive members. The electrically conductive members have receptacle terminals and brush base connection portions. Tip ends of the brush bases pass through the metal plate, and come into contact with the brush base connection portions of the electrically conductive members to thereby be electrically connected thereto. The PTC element is accommodated within a PTC element insertion portion of the brush holder which extends through the metal plate in a thrust direction.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: February 5, 2013
    Assignee: Mabuchi Motor Co., Ltd.
    Inventor: Ikuo Matsushita
  • 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
  • Patent number: 8330320
    Abstract: [Problem to be Solved] There is provided a highly wear-resistant and durable sliding contact material applicable to a commutator of a motor used for high-capacity applications in which the initial starting current (IS) is 1 ampere or higher. [Solution] The present invention provides a sliding contact material in which metal oxide particles are dispersed in an Ag alloy matrix, wherein the Ag alloy matrix is an Ag alloy containing 0.01 to 10.0 wt % of at least one kind of Fe, Co, Ni and Cu in Ag, and 0.1 to 3.0 wt % of a Ta oxide is dispersed as the metal oxide. In the present invention, 0.1 to 10.0 wt % of metal oxide particles of one kind or two or more kinds of Mg, Fe, Co, Ni and Zn may further be dispersed. The sliding contact material is used in a mode of clad composite material formed by embedding the sliding contact material in a part of a base material consisting of Cu or Cu alloy.
    Type: Grant
    Filed: April 27, 2010
    Date of Patent: December 11, 2012
    Assignees: Mabuchi Motor Co., Ltd., Tanaka Kikinzoku Kogyo K.K.
    Inventors: Keiji Nakamura, Makoto Takabatake, Hideyuki Uzawa, Masahiro Takahashi, Yoshinori Horiuchi, Takao Asada, Osamu Sakaguchi
  • Patent number: 8330315
    Abstract: Magnetic poles are arranged such that the N pole and the S pole alternate in a circumferential direction. Two N poles face each other with an interval of 180° therebetween, and two S poles face each other with an interval of 180° therebetween. Each of the magnetization center of a North magnetic pole and the magnetization center of a South magnetic pole is positionally shifted from the center position between the magnetization centers of two magnetic poles of the other polarity located on opposite sides of the North or South magnetic pole. The magnetization centers of the magnetic poles are disposed in such a manner as to be positionally shifted from geometric centerlines. Brushes are disposed along the respective geometric centerlines. The magnetization centers of two adjacent magnetic poles are positionally shifted toward or away from each other by the same shift angle ? with respect to the respective geometric centerlines.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: December 11, 2012
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Eiji Uenishi, Eiji Mayumi
  • Patent number: 8258661
    Abstract: A motor includes a tubular housing having flat side walls along each side of rectangular joined with each other by joining sections, a magnet, having magnet poles in the jointing section, disposed along the inner peripheral surfaces of the housing, a shaft inserted along the axis of the housing, an armature fixed to the shaft in such a position as to be opposite to the magnet, a commutator mounted on the shaft, a carbon brush in sliding contact with the outer peripheral surface of the commutator, and electrical components provided within the housing. The electrical components in the longer direction are arranged such that they are not parallel with all the sides of the housing.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: September 4, 2012
    Assignee: Mabuchi Motor Co. Ltd.
    Inventors: Hiroshi Yamazaki, Eiji Mayumi