Patents Assigned to Ogura Clutch Co., Ltd.
  • Patent number: 11149808
    Abstract: An excitation operation brake includes a braking shaft, an armature that rotates integrally with the braking shaft, and a field core including a disc portion facing the armature. The disc portion includes an outer magnetic shielding portion and an inner magnetic shielding portion, which make a magnetic flux flowing through the disc portion bypass to the armature a plurality of times. The outer magnetic shielding portion includes a low-magnetic resistance path having a magnetic resistance smaller than the magnetic resistance of a magnetic path that bypasses to the armature.
    Type: Grant
    Filed: October 2, 2019
    Date of Patent: October 19, 2021
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Yasuo Kidena, Keita Nakashima, Takeshi Maeda, Motoi Kato, Yoshihiro Kurosu, Hiroyasu Onai, Kosuke Murakami
  • Patent number: 10955012
    Abstract: An electromagnetic connecting device includes a flange of a hub, an armature supported by the flange via a leaf spring, a rotor accommodating an electromagnetic coil, and an anti-vibration member. When an electric current is supplied to the electromagnetic coil, the armature moves in the axial direction of the hub against the spring force of the leaf spring, and is attracted to the rotor. The leaf spring includes a moving portion that moves in the axial direction together with the movement of the armature. The anti-vibration member is fixed to the moving portion of the leaf spring. The anti-vibration member includes a stopper that comes in contact with the flange, and a damper that comes in contact with the armature. With this configuration, an electromagnetic connecting device capable of reducing an impact sound both when the armature is attracted and released can be manufactured at a low manufacturing cost.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: March 23, 2021
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Yoshihiro Kurosu, Yoshinori Fujisawa, Daichi Takahashi
  • Patent number: 10473167
    Abstract: An electromagnetic clutch includes a field core including a coil storage groove, and a rotor including a core storage groove. The coil storage groove is formed by an inner cylindrical portion, an outer cylindrical portion, and a bottom portion. The bottom portion of the field core wholly projects to the outside of the core storage groove. The outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the outer cylindrical portion include a first transition surface and a second transition surface, respectively, on the bottom portion side. Each of the first transition surface and the second transition surface includes a tilting surface that gradually narrows the groove width of the coil storage groove along with an increase in a distance from the side of the opening of the coil storage groove.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: November 12, 2019
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Motoi Kato, Yoshihiro Kurosu, Yasuyuki Iizuka, Shun Tomaru
  • Patent number: 10192664
    Abstract: A yoke includes an annular groove in which an exciting coil is stored, and a first through hole formed in the bottom of the annular groove. A terminal housing includes a boss portion fitted in the first through hole and a connecting concave portion located on the opposite side of the annular groove with respect to the boss portion. The boss portion includes a second through hole extending in a direction parallel to the center line of the first through hole. An external connecting terminal is buried in the terminal housing. The external includes a coil extraction hole continuing to the second through hole. The extraction end of the exciting coil is soldered to the terminal in a state in which the extraction end is passed through the second through hole and the coil extraction hole.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: January 29, 2019
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Motoi Kato, Yoshihiro Kurosu, Yasuyuki Iizuka, Yoshikazu Arai
  • Patent number: 10184530
    Abstract: An electromagnetic connection device includes an armature (4), a rotor (3), an electromagnetic coil (14), and a spring member (24) that biases the armature (4) in a direction in which the armature (4) is separated from the rotor (3). The electromagnetic connection device includes a damping member (25) mounted on the armature (4) so as to face the rotor (3). The armature (4) includes a flat portion (22) and a tubular portion (8). The damping member (25) includes a damper cover (26) including an abutment portion along the flat portion (22) and an engaging portion along the tubular portion (8), and an elastic member (27) sandwiched between the abutment portion and the flat portion (22). The damper cover (26) is put on the armature (4) from the side of the rotor (3) and movably held on the tubular portion (8). The flat portion (22) includes a concave portion (35) configured to store the abutment portion of the damper cover (26).
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: January 22, 2019
    Assignees: NTN CORPORATION, OGURA CLUTCH CO., LTD.
    Inventors: Takahide Saito, Koji Sato, Naotsugu Kitayama, Yoshihiro Kurosu, Haruhiko Ushirode
  • Patent number: 10056180
    Abstract: A seal structure for an electromagnet lead wire includes an annular yoke including an annular groove, a wiring hole configured to pass a lead wire of an exciting coil, an insulating resin configured to seal the exciting coil, and a seal member arranged in the hole. The wiring hole includes a though hole of a case, and a concave portion of the yoke. The insulating resin includes a projecting portion whose distal end face is located in the concave portion. The seal member includes a columnar portion inserted into the though hole, and a flange portion located in the concave portion. The flange portion is sandwiched and compressed between the device inner surface of the case and the distal end face of the insulating resin.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: August 21, 2018
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Yoshihiro Kurosu, Takashi Yamaguchi, Haruhiko Ushirode
  • Patent number: 10036431
    Abstract: An electromagnetic clutch includes an armature to be attracted to a rotor, an armature hub formed on one end portion of a rotating shaft, and a leaf spring which connects the armature to the armature hub and biases the armature away from the rotor. The leaf spring includes a base fixed to the armature hub, a stopper connected to the base, and a connecting piece surrounding the stopper by projecting outside from the base, and fixed to the armature. A through hole into which a rivet for fixing the base to the armature hub is inserted is formed in the base. A low-strength portion having strength lower than that in the periphery of the through hole is formed in a boundary portion between the base and a connecting portion.
    Type: Grant
    Filed: September 8, 2016
    Date of Patent: July 31, 2018
    Assignee: OGURA CLUTCH CO., LTD.
    Inventor: Yoshinori Fujisawa
  • Patent number: 9783388
    Abstract: This invention includes an annular hysteresis brake (34) having one end fixed to a stationary frame (11), a support shaft (6) extending through a hollow portion of the hysteresis brake (34), and a spindle part (4) rotatably supported by the support shaft (6). The hysteresis brake (34) includes a yoke (36), a cylindrical hysteresis member (46) inserted into an annular space (41) of the yoke (36), and a hub (37) for rotatably supporting the hysteresis member (46). The spindle part (4) is supported by the support shaft (6) such that the spindle part (4) is restricted from moving toward the hysteresis brake (34) by a sleeve (15). The spindle part (4) and hub (37) are coupled with each other so as to rotate together via pins (21). This invention can simplify the structure while preventing damage to the hysteresis brake, thereby reducing the manufacturing cost of a thread-supplying spindle unit.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: October 10, 2017
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Yoshiyuki Matsumoto, Nobuyuki Shutou
  • Patent number: 9631688
    Abstract: An electromagnetic clutch includes a rotation transmission member supported by an input shaft portion via a bearing. The rotation transmission member includes a movement regulating portion having abutment portions that abut against the bearing. The clutch further includes first and second spring members that bias an armature toward a braking member, and a connecting member overlaid on the movement regulating portion. The connecting member has first holes at portions facing the abutment portions, and second holes at portions facing regions between the abutment portions. One-end portions of the first and second spring members are attached to the armature. First fixing members inserted into the first holes fix the other-end portions of the first spring members to the connecting member. Second fixing members inserted into the second holes fix the other-end portions of the second spring members to the connecting member and fix the connecting member to the movement regulating portion.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: April 25, 2017
    Assignee: OGURA CLUTCH CO., LTD.
    Inventors: Yoshihiro Kurosu, Takashi Yamaguchi, Yasuyuki Iizuka, Yoshikazu Arai
  • Publication number: 20160252143
    Abstract: A power transmission device includes a pulley (4) and a hub (11) that are arranged on the same rotation axis, and a connecting member (13) that connects these rotation bodies. The power transmission device includes a first connecting structure (14) that connects one end portion (13a) of the connecting member to the pulley so that one end portion (13a) cannot be separated, and a second connecting structure (15) that connects the other end portion (13b) of the connecting member to the hub so that the other end portion (13b) can be separated. The second connecting structure includes a columnar body (21) that extends through the other end portion (13b) of the connecting member (13) in the axial direction, a head portion (28) that is provided on the columnar body (21), a slit (22) of the connecting member (13), and a belleville spring (29) that presses the connecting member (13) against the rotation body.
    Type: Application
    Filed: March 17, 2014
    Publication date: September 1, 2016
    Applicant: OGURA CLUTCH CO., LTD.
    Inventors: Motoi Kato, Yoshihiro Kurosu, Takahiro Kanzawa
  • Patent number: 9422989
    Abstract: An electromagnetic clutch device includes an armature, a rotor, an electromagnet, and a silencing member. The armature is supported by a driving member so that the armature is movable in the axial direction and rotate integrally with the driving member. The rotor is arranged coaxially with the armature, rotate with respect to the armature and rotate integrally with an output member. The electromagnet presses the armature and the rotor against each other based on an electromagnetic attraction force generated when current is supplied through the electromagnet to be coupled with each other in the torque transmittable manner. The silencing member is provided on an outer circumferential portion of the armature to attenuate noise generated by the vibration of the armature in a state where the silencing member is out of contact with any member other than the armature.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: August 23, 2016
    Assignees: AISIN SEIKI KABUSHIKI KAISHA, OGURA CLUTCH CO., LTD.
    Inventors: Eisuke Umemura, Tomohiro Negishi, Seiichi Sumiya, Keisuke Matsumoto, Fumiaki Togitani, Takashi Yamaguchi
  • Patent number: 8973727
    Abstract: An electromagnetic clutch includes a first rotation transmission portion, annular field core, rotation stop member, second rotation transmission portion, armature, and spring member. The annular field core is supported by the first rotation transmission portion via a first bearing. The first bearing is housed in a hollow portion of the field core and fitted on an inner circumferential surface of the field core. The rotation stop member includes a flat portion which is fixed to an end of the field core on a side opposite to the armature. The flat portion is formed integrally with a retaining piece which projects toward the hollow portion of the field core and faces the first bearing when viewed from the axial direction of the field core.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: March 10, 2015
    Assignee: Ogura Clutch Co., Ltd.
    Inventors: Toshio Takahashi, Hiroyasu Yoshihara, Miyuki Arai
  • Publication number: 20150014118
    Abstract: An electromagnetic clutch device includes an armature, a rotor, an electromagnet, and a silencing member. The armature is adapted to be supported by a driving member so that the armature is movable in the axial direction and rotate integrally with the driving member. The rotor is arranged coaxially with the armature, rotate with respect to the armature and rotate integrally with an output member. The electromagnet presses the armature and the rotor against each other based on an electromagnetic attraction force generated when current is supplied through the electromagnet to be coupled with each other in the torque transmittable manner. The silencing member is provided on an outer circumferential portion of the armature. The silencing member is formed of a soft material that attenuates noise generated by the vibration of the armature in a state where the silencing member is out of contact with any member other than the armature.
    Type: Application
    Filed: July 2, 2014
    Publication date: January 15, 2015
    Applicants: AISIN SEIKI KABUSHIKI KAISHA, OGURA CLUTCH CO., LTD.
    Inventors: Eisuke UMEMURA, Tomohiro NEGISHI, Seiichi SUMIYA, Keisuke MATSUMOTO, Fumiaki TOGITANI, Takashi YAMAGUCHI
  • Patent number: 8561773
    Abstract: A drive device is provided with a housing 11 and an electromagnetic clutch mechanism 14 accommodated in the housing. The electromagnetic clutch mechanism 14 is provided with an armature 41 rotatably supported in the housing 11, a rotor 42 arranged to face the armature 41 and rotatably supported in the housing 11, and a coil 46. An annular magnet 44 is fixed on the outer circumference surface of the rotor 42. A sensor 15 arranged inside the housing 11 detects a polarity change of the magnet 44 in association with rotation of the rotor 42. The magnet 44 is provided with an annular wall portion 44b extending toward the armature 41 beyond a surface on which the armature 41 is in contact with the rotor 42 with respect to the axial direction. The annular wall portion 44b is spaced radially outward from the armature 41. The annular wall portion 44b prevents abrasion powder produced on actuation of the electromagnetic clutch mechanism 14 from being scattered.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: October 22, 2013
    Assignees: Aisin Seiki Kabushiki Kaisha, Ogura Clutch Co., Ltd.
    Inventors: Ryoichi Fukumoto, Tomoaki Nishimura, Tsutomu Takeuchi, Hiroyasu Onai, Takashi Yamaguchi
  • Patent number: 8294545
    Abstract: An electromagnetic coupling device includes a field core, a surge voltage absorbing member, and a storage member. The field core is provided inside an exciting coil. The surge voltage absorbing member is connected to the exciting coil. The storage member is made of an insulating material and includes a recess portion to store the surge voltage absorbing member. A through hole is formed in an outer wall of the field core. The storage member is inserted into the through hole with an opening of the recess portion facing the exciting coil. The surge voltage absorbing member is inserted in the recess portion so as to be positioned outside the field core by the exciting coil.
    Type: Grant
    Filed: August 25, 2010
    Date of Patent: October 23, 2012
    Assignee: Ogura Clutch Co., Ltd.
    Inventors: Yoshihiro Kurosu, Shigeru Yuki
  • Patent number: 8235196
    Abstract: An electromagnetic clutch includes a rotor, armature hub, armature, magnetic body and first permanent magnet, field core, excitation coil, and second permanent magnet. The rotor is rotatably disposed in the housing of a driven device. The armature hub is fixed to the rotating shaft of the driven device, the armature movable in an axial direction. The magnetic body is incorporated in the rotor. The first permanent magnet connects the armature to the rotor. The field core is attached to the housing and inserted in the rotor to be in noncontact with it. The excitation coil is disposed in the field core and excited, when cutting off power transmission, to cancel a magnetic force of the first permanent magnet, thus releasing the armature from the first permanent magnet. The second permanent magnet separates the armature from the rotor, when cutting off power transmission, to move the armature toward the armature hub.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: August 7, 2012
    Assignee: Ogura Clutch Co., Ltd.
    Inventors: Motoi Kato, Yoshihiro Kurosu, Haruhiko Ushirode
  • Patent number: 8016685
    Abstract: In a power transmission apparatus, a driving rotary body is rotated by power from a driving device. A driven rotary body includes a driven rotary member attached to a rotating shaft of a driven device and a holding plate attached to the driven rotary member. A damper mechanism includes a cylindrical elastic member attached to the driving rotary body and a connecting member which is engaged in the elastic member to be movable forward/backward. At least one rotation transmission member is attached to the connecting member, has one end connected to the driving rotary body through the damper mechanism and the other end separably connected to the driven rotary body, and transmits rotation of the driving rotary body to the driven rotary body. A preset load setting member is mounted between the driven rotary body and the connecting member to elastically deform the rotation transmission member, thus applying a preset load.
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: September 13, 2011
    Assignee: Ogura Clutch Co., Ltd.
    Inventor: Yoshihiro Kurosu
  • Patent number: 8011488
    Abstract: Brushes (20, 21) which come into slidable contact with slip rings (23, 24) having power feeding terminals (51, 53) electrically connected to a power feeding side include extending portions (32, 36) extending in the radial direction of a field core (3). These extending portions (32, 36) are bent in a direction away from a coil bobbin (12). The third bent portions (32c, 36c) located at the ends of the extending portions are electrically connected to the terminal portions (10d) of coil terminals. An outer diameter R1 of a mounting recess portion (3a) which stores a power feeding device (5) of the field core (3) is smaller than an inner diameter R2 of the coil bobbin (12). This makes it possible to position the mounting recess portion (3a) at a distance H from the coil bobbin (12) in the field core (3) in the arrow A direction, thereby reducing the size of the rotating coil type electromagnetic clutch (1) in the arrow A-B direction.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: September 6, 2011
    Assignees: Ogura Clutch Co., Ltd., Aisin Seiki Kabushiki Kaisha
    Inventors: Takashi Yamaguchi, Masao Imamura, Satoshi Hayashi, Toshihiko Ishida, Tsutomu Takeuchi
  • Publication number: 20100155191
    Abstract: A drive device is provided with a housing 11 and an electromagnetic clutch mechanism 14 accommodated in the housing. The electromagnetic clutch mechanism 14 is provided with an armature 41 rotatably supported in the housing 11, a rotor 42 arranged to face the armature 41 and rotatably supported in the housing 11, and a coil 46. An annular magnet 44 is fixed on the outer circumference surface of the rotor 42. A sensor 15 arranged inside the housing 11 detects a polarity change of the magnet 44 in association with rotation of the rotor 42. The magnet 44 is provided with an annular wall portion 44b extending toward the armature 41 beyond a surface on which the armature 41 is in contact with the rotor 42 with respect to the axial direction. The annular wall portion 44b is spaced radially outward from the armature 41. The annular wall portion 44b prevents abrasion powder produced on actuation of the electromagnetic clutch mechanism 14 from being scattered.
    Type: Application
    Filed: July 26, 2006
    Publication date: June 24, 2010
    Applicants: Aisin Seiki Kabushiki Kaisha, Ogura Clutch Co., Ltd.
    Inventors: Ryoichi Fukumoto, Tomoaki Nishimura, Tsutomu Takeuchi, Hiroyasu Onai, Takashi Yamaguchi
  • Patent number: 6837195
    Abstract: A rotor housing (2) has flanges (8) projecting to two sides in the directions of axes of rotors and having suction flow outlets for suction pipes (33) which are integrally connected to the rotor housing (2). The rotor housing (2), a collector housing (21), and the suction pipes (33) are integrally formed of aluminum alloy casting. The lower surfaces of the flanges (8) of the rotor housing (2) are used as attaching surfaces to be attached to the upper surface of a cylinder head.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: January 4, 2005
    Assignee: Ogura Clutch Co., Ltd.
    Inventor: Kazutoshi Suwazono