Patents Assigned to Mitsuba Corporation
  • Publication number: 20240162783
    Abstract: A cylindrical member 93 is provided with a pair of slits 93a, 93b extending in the axial direction of the cylindrical member 93. The opening widths of the pair of slits 93a, 93b in the circumferential direction of the cylindrical member 93 are narrower on the outside (opening widths W2, W4) of the cylindrical member 93 than on the inside (opening widths W1, W3) thereof. This makes it possible to prevent rainwater and the like from reaching a communication hole 91 inside the cylindrical member 93 and quickly discharge the rainwater and the like intruded into the inside of the cylindrical member 93 to the outside of the cylindrical member 93. Accordingly, it is possible to effectively prevent the rainwater and the like from intruding into the inside (hollow portion) of a gear cover 80, thereby enabling to improve a water exposure reliability.
    Type: Application
    Filed: March 28, 2022
    Publication date: May 16, 2024
    Applicant: MITSUBA Corporation
    Inventors: OSAMU NAKAMURA, KEISUKE TORIYAMA
  • Patent number: 11984773
    Abstract: A driver for motors according to the present invention is provided with: an aluminum substrate (10) which forms one surface of a housing; an insulating layer (11) which is formed on a surface of the aluminum substrate (10); a plurality of electronic elements (13) which are bonded onto a surface of the insulating layer (11), said surface being on a side opposite to the aluminum substrate (10); and a resin member (14) that covers the surface onto which the electronic elements (13) are bonded. This driver for motors is characterized in that the resin member (14) is obtained by integrating a mold resin part (20) which covers the electronic elements (13) from the upper surface side, a connector (21) which is electrically connected to the electronic elements (13), and a fitting part (22) which is used for fitting to a motor.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: May 14, 2024
    Assignee: MITSUBA Corporation
    Inventors: Tomoya Ikariya, Takahiko Ogane, Fumiaki Koshio, Hiroyuki Hirano
  • Patent number: 11970898
    Abstract: A drive unit for driving an open-and-close body and a method for attaching the drive unit to the open-and-close body. The drive unit includes a cable, a drum, a pulley, a fix member, an elastic member, and a limiting member. The cable has a portion connected to the open-and-close body and another portion wound on the drum. The pulley is movable between a first position, where the pulley does not tension the cable, and a second position, where the pulley engages the cable and applies tension to the cable. The fix member is capable of fixing the pulley in the first position. The elastic member urges the pulley towards the second position. The limiting member is provided between the drum and the fix member, and the limiting member allows or limits rotation of the drum in accordance with the position of the pulley.
    Type: Grant
    Filed: February 13, 2020
    Date of Patent: April 30, 2024
    Assignee: MITSUBA Corporation
    Inventors: Ryo Gokan, Yoshitaka Urano
  • Publication number: 20240136880
    Abstract: An insulator attached to a core body in an annular shape and multiple teeth protruding from the core body along a radial direction for insulating the teeth and a coil wound around the teeth includes: a tooth end surface covering part covering an axial end surface of the tooth. The tooth end surface covering part includes: an inclined part provided on a front surface of the tooth end surface covering part on a side opposite to the tooth and inclined such that its height from the axial end surface of the tooth gradually changes along the radial direction; and an inclined part parallel part and a tooth parallel part provided on a back surface of the tooth end surface covering part on the tooth side and concave in a direction away from the axial end surface of the tooth.
    Type: Application
    Filed: March 16, 2022
    Publication date: April 25, 2024
    Applicant: MITSUBA Corporation
    Inventors: KOJI YONEKAWA, TAKESHI KANAI, RYO OHORI, YUKARI OTSUKA
  • Publication number: 20240123943
    Abstract: A motor control device includes a driving control part and an upper limit value setting part. The driving control part controls motor driving by switching between a first driving mode and a second driving mode, and controls an output duty ratio so as not to exceed a duty ratio upper limit value. The upper limit value setting part sets, as the duty ratio upper limit value, a low rotation duty ratio upper limit value, a maximum duty ratio upper limit value corresponding to a maximum output value, and an upper limit value of a transition period from the low rotation duty ratio upper limit value to the maximum duty ratio upper limit value, and changes slope information indicating a change amount in the upper limit value of the transition period according to the driving mode when switching between the first driving mode and the second driving mode.
    Type: Application
    Filed: June 1, 2023
    Publication date: April 18, 2024
    Applicant: MITSUBA Corporation
    Inventors: Ryo OHORI, Toshiyuki AMAGASA, Masahiro YAMADA, Atsushi MOCHIDA, Tamotsu IWAZAKI
  • Patent number: 11962198
    Abstract: Provided is a high-quality electric motor which can be manufactured at a high yield rate. An electric motor comprises a stator which is housed in a motor case, and a rotor which is provided with a shaft and a rotor body section. The shaft is rotatably supported by the motor case, and the rotor body section has a ring magnet disposed inside the stator. A magnet cover into which the rotor body section is inserted has a circular cylinder section which covers the outer peripheral surface of the ring magnet, a turned-back section which is in contact with an end surface of the rotor body section, and a fastening end section which is fastened to a flange section provided to the shaft so as to cover an end surface. An engagement latch section engaging with the rotor is provided to the turned-back section.
    Type: Grant
    Filed: February 18, 2019
    Date of Patent: April 16, 2024
    Assignee: MITSUBA Corporation
    Inventor: Naoyuki Miyashita
  • Patent number: 11955844
    Abstract: A rotor is provided with: a rotor core (32); a plurality of permanent magnets (33); a substantially tubular magnet cover (71); and a load reception block (70). The rotor core (32) rotates integrally with a rotary shaft of a motor. The permanent magnets (33) are arranged on the outer peripheral part of the rotor core (32). The magnet cover (71) covers the exterior of the plurality of permanent magnets (33) and the rotor core (32), and has a flange part which is bent radially inward at the end along a rotation axis. The load reception block (70) is disposed between the flange part and the end surface of the rotor core (32) in a direction along the rotation axis, and abuts against the flange part and the rotor core (32).
    Type: Grant
    Filed: November 11, 2019
    Date of Patent: April 9, 2024
    Assignee: MITSUBA Corporation
    Inventors: Ryo Ohori, Koji Yonekawa, Takeshi Kanai
  • Patent number: 11949326
    Abstract: Provided is a power supply device including a capacitor, a pre-charge circuit and a control circuit. The capacitor is connected in series with a contactor that is connected between an inverter driving a motor and a battery and that switches on or off power supply from the battery to the inverter, and is connected in parallel with the inverter. The pre-charge circuit is connected in parallel with the contactor and pre-charges the capacitor. The control circuit controls the pre-charge circuit and the contactor. The control circuit includes a sensor that measures the voltage of the battery and the voltage of the capacitor, and determines whether the pre-charge is necessary according to whether a ratio of the voltage of the capacitor to the voltage of the battery is equal to or less than a target value.
    Type: Grant
    Filed: July 2, 2020
    Date of Patent: April 2, 2024
    Assignee: MITSUBA Corporation
    Inventor: Hiroaki Hiruma
  • Publication number: 20240106377
    Abstract: A motor control device which controls a motor having an output shaft includes a vehicle speed detection part and a driving control part. The vehicle speed detection part detects a vehicle speed, which is a traveling speed of a vehicle mounted with the motor. Based on the vehicle speed detected by the vehicle speed detection part, the driving control part performs control of switching between a first driving mode which drives the motor, and a second driving mode in which a number of revolutions of the output shaft and an output of the motor are higher than in the first driving mode.
    Type: Application
    Filed: June 18, 2023
    Publication date: March 28, 2024
    Applicant: MITSUBA Corporation
    Inventors: RYO OHORI, TOSHIYUKI AMAGASA, MASAHIRO YAMADA, ATSUSHI MOCHIDA, TAMOTSU IWAZAKI
  • Publication number: 20240088746
    Abstract: A case 31 has a total of first to sixth flat parts 32A to 32F arranged in a circumferential direction of the case 31 and a total of first to sixth arced parts 32a to 32f connecting adjacent flat parts with each other. When viewed in an axial direction of a shaft 44, inner circumferential surfaces CF of the first to sixth arced parts 32a to 32f are each formed in an arced shape having a radius R1 and a center AC of the case 31 as the center. In addition, since the stator 35 is only supported by the inner circumferential surfaces CF (six in total), the press-fit load of the stator 35 with respect to the case 31 can be reduced, and it is possible to increase the assembling accuracy.
    Type: Application
    Filed: August 14, 2023
    Publication date: March 14, 2024
    Applicant: MITSUBA Corporation
    Inventors: YASUSHI YOSHIDA, YUTARO JO
  • Publication number: 20240088734
    Abstract: A stator includes: an A-phase coil, wound around four of 12 teeth and supplied with an A-phase current; a B-phase coil, wound around another four of the 12 teeth and supplied with a B-phase current; a C-phase coil, wound around yet another four of the 12 teeth and supplied with a C-phase current. The A-phase coil includes a transition part extending along the cylindrical part on an axial side between the teeth spaced apart in the circumferential direction. The B-phase and C-phase coils each include a transition part extending along the cylindrical part on another axial side between the teeth spaced apart in the circumferential direction. The turns of the first A-phase coil are one turn fewer than the turns of the first B-phase coil and the turns of the first C-phase coil.
    Type: Application
    Filed: June 20, 2023
    Publication date: March 14, 2024
    Applicant: MITSUBA Corporation
    Inventors: Shingo WATANABE, Keiichi Hosoi, Satoshi Itabashi
  • Publication number: 20240072605
    Abstract: 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: Application
    Filed: June 13, 2023
    Publication date: February 29, 2024
    Applicant: MITSUBA Corporation
    Inventors: TEPPEI TOKIZAKI, Motoaki Kobayashi, Satoshi Tamura, Masaki Hayata, Masakazu Saito, Yoshichika Kawashima
  • Patent number: 11916439
    Abstract: Provided are a rotor, a motor, and a wiper motor. An arc center of an outer circumferential surface of a rotor core and an arc center of an inner circumferential surface of a permanent magnet are off-centered radially outward from a rotational axis, with the circumferential center disposed on the radially outermost side. An angle formed by salient pole side surfaces facing each other of circumferentially adjacent two salient poles is equal to an angle formed by magnet side surfaces on both sides circumferentially of the permanent magnet. When the distance between the outer circumferential surface of the rotor core and the radially outermost end of the salient poles is Lt, and the distance between the inner circumferential surface of the permanent magnet and the radially outermost end of the magnet side surfaces is Lme, the distances Lt, Lme are set such that the relationship Lme<Lt is satisfied.
    Type: Grant
    Filed: October 1, 2019
    Date of Patent: February 27, 2024
    Assignee: MITSUBA Corporation
    Inventor: Ryo Ohori
  • Publication number: 20240063697
    Abstract: Provided is a motor including a stator and a rotor. The rotor includes a rotor core rotating integrally with an rotation shaft and having a core base end part fixed to the rotation shaft and core protrusions protruding outward in a radial direction from the core base end part; and a magnet disposed between the core protrusions adjacent to each other in a circumferential direction on an outer peripheral surface of the core base end part. A central position of the stator core in the axial direction, a central position of the rotor core in the axial direction, and a central position of the magnet in the axial direction are deviated from each other. The central position of the magnet in the axial direction is located between the central position of the stator core in the axial direction and the central position of the rotor core in the axial direction.
    Type: Application
    Filed: October 30, 2023
    Publication date: February 22, 2024
    Applicant: MITSUBA Corporation
    Inventor: RYO OHORI
  • Publication number: 20240063689
    Abstract: 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: Application
    Filed: November 2, 2023
    Publication date: February 22, 2024
    Applicant: MITSUBA Corporation
    Inventors: NAOKI KOJIMA, MOTOAKI KOBAYASHI, TEPPEI TOKIZAKI, Yoshichika KAWASHIMA
  • Patent number: 11901779
    Abstract: A motor includes: a stator having teeth protruding radially inward from the inner peripheral surface of a stator core; coils wound on the teeth; a shaft rotating on the inside radially of the stator core; a rotor core affixed to the shaft and radially centered on the rotation axis of the shaft; permanent magnets arranged on the outer peripheral surface of the rotor core; projecting poles which are formed projecting radially outward between the permanent magnets adjacent to each other in the circumferential direction of the outer peripheral surface of the rotor core, and with which the projecting contact surfaces of the permanent magnets are in contact. The stator is formed by stacking electromagnetic steel sheets in the direction of the rotation axis of the shaft. At least one of the axial ends of each of the permanent magnets projects further than an axial end of the rotor core.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: February 13, 2024
    Assignee: MITSUBA Corporation
    Inventor: Ryo Ohori
  • Patent number: 11894753
    Abstract: 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: Grant
    Filed: April 3, 2019
    Date of Patent: February 6, 2024
    Assignee: MITSUBA Corporation
    Inventors: Naoki Kojima, Motoaki Kobayashi, Teppei Tokizaki, Yoshichika Kawashima
  • Patent number: 11888427
    Abstract: A motor control device according to the disclosure includes: a current control part, performing current control for rotating a motor from a stop state; a rotation speed calculation part, calculating an actual rotation speed of the motor; an acquisition part, acquiring a target rotation speed of the motor; a speed control part, performing speed control of the motor, so that the actual rotation speed of the motor becomes the target rotation speed; and a correction part, at a time when a current control state is transitioned to a speed control, correcting the target rotation speed based on a relation between the actual rotation speed and the target rotation speed. When the target rotation speed is corrected, the speed control part performs the speed control so that the actual rotation speed becomes the target rotation speed corrected by the correction part.
    Type: Grant
    Filed: December 2, 2021
    Date of Patent: January 30, 2024
    Assignee: MITSUBA Corporation
    Inventors: Kota Fukashiro, Miya Yamada
  • Patent number: 11881868
    Abstract: A control system includes: a semiconductor chip, having built therein a processing part, an A/D converter and a pull device circuit; a wiring part, having one end connected to a terminal connected to the A/D converter; and a sensor, connected to the other end of the wiring part and inputting a sensor signal in analog form via the wiring part. The pull device circuit includes a switching element, and has one end connected to ground or a power supply voltage and the other end connected between the A/D converter and the terminal. The processing part includes: a switch control part, controlling the switching element to be in an on or off state; a sensor information generator, generating sensor information based on the sensor signal; and a disconnection detector, detecting disconnection of the wiring part based on output of the A/D converter when the switching element is in the on state.
    Type: Grant
    Filed: May 4, 2022
    Date of Patent: January 23, 2024
    Assignee: MITSUBA Corporation
    Inventor: Miya Yamada
  • Patent number: 11870324
    Abstract: Because the pressure angle ?° (=12°) of teeth (47) of a worm wheel (46) is larger than the pressure angle ?° (=11°) of teeth (45) of a worm (44), tips of the teeth (47) of the worm wheel (46) can be more tapered as compared with a case in which the pressure angle of the teeth of the worm and the pressure angle of the teeth of the worm wheel are the same angle (the conventional case). Thereby, it is possible to ensure non-contact of teeth, which had been variable in terms of contact and non-contact in the case of the conventional form, even if there has been non-uniformity in the teeth (47) of the worm wheel (46).
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: January 9, 2024
    Assignee: MITSUBA Corporation
    Inventors: Hiroyuki Uchimura, Kazuaki Aoki