Patents by Inventor Kenji Hibi

Kenji Hibi 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: 8992658
    Abstract: A sintered metal bearing is obtained by compression-molding of a raw-material powder containing at least a Cu powder, an SUS powder, and a pure Fe powder and thereafter sintering a compression-molded body at a predetermined temperature.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: March 31, 2015
    Assignee: NTN Corporation
    Inventors: Fuyuki Ito, Kazuo Okamura, Kenji Hibi
  • Patent number: 8876386
    Abstract: A fluid dynamic bearing device which can exhibit high bearing performance is provided at low costs by forming a highly accurate bearing gap. At least a region in the outer circumferential surface of a shaft which faces the radial bearing gap is constituted of an electroformed part, and the region of the shaft excluding the electroformed part is constituted of a resin portion.
    Type: Grant
    Filed: February 16, 2007
    Date of Patent: November 4, 2014
    Assignee: NTN Corporation
    Inventors: Kenji Hibi, Kenji Ito, Yasuhiro Yamamoto, Hiroshi Niwa, Isao Komori, Tetsuya Yamamoto
  • Patent number: 8562219
    Abstract: A gap width out of the radial bearing gap is axially differed; a narrow width part which has a relatively smaller gap width in the radial bearing gap is arranged on the side relatively closer to a barycentric position of the rotating body, and a wide width part which has a relatively larger gap width in the radial bearing gap is arranged on a side relatively distant from the barycentric position of the rotating body; and a region facing at least the radial bearing gap of the bearing member is formed to an electroformed part made of deposited metal.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: October 22, 2013
    Assignee: NTN Corporation
    Inventors: Masaharu Hori, Masaaki Toda, Kenji Hibi, Tetsuya Yamamoto
  • Patent number: 8469596
    Abstract: Fine particles (6) are retained by an electroformed portion (4) in a dispersed state, and the fine particles (6) exposed from an outer peripheral surface (4a2) of the electroformed portion (4) are molten so as to form micro projections (60) integrated with a resin portion (5). The micro projections (60) enters into fine-particle traces (4c) formed in the electroformed portion (4) to exert an anchor effect, to thereby increase a fixation force between the resin portion (5) and the electroformed portion (4).
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: June 25, 2013
    Assignee: NTN Corporation
    Inventors: Isao Komori, Yasuhiro Yamamoto, Kenji Hibi
  • Patent number: 8419281
    Abstract: An inner periphery of a molded part having a step from an inner periphery of an electroformed part is molded to a nonconductive coating which covers the surface of a master. When the nonconductive coating is removed, a radial clearance having a diameter greater than that of a bearing clearance is created between the inner periphery of the molded part, which is exposed to the interior, and an outer periphery of a shaft member. A bearing member which forms the bearing and radial clearance with the shaft member is manufactured by performing electroforming on the master with the nonconductive coating formed on part of the surface of the master, thereby forming the electroformed part; then injection molding the bearing member with the electroformed part and the nonconductive coating on the surface of the master inserted into a cavity; and then removing the nonconductive coating from the bearing member.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: April 16, 2013
    Assignee: NTN Corporation
    Inventors: Kenji Hibi, Yasuhiro Yamamoto, Tetsuya Yamamoto, Mitsuo Sasabe
  • Patent number: 8366322
    Abstract: A shaft member for a fluid dynamic bearing device that has a recess to cause a dynamic pressure effect of a fluid in a bearing clearance, which is formed on it by rolling, and where a surface layer portion of the recess and a surface layer portion of a surrounding region of the recess has a nitride layer, and where nitrogen is diffused and penetrated in a material of the shaft member that is formed by nitriding after the rolling.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: February 5, 2013
    Assignee: NTN Corporation
    Inventors: Kenji Hibi, Yasuhiro Yamamoto
  • Publication number: 20120243813
    Abstract: Provided is a fluid dynamic bearing device which has excellent moment rigidity and an improved working efficiency in assembling and parts control, and in which a bearing sleeve can be easily manufactured. A plurality of bearing sleeves are axially disposed in the fluid dynamic bearing device. The bearing sleeves (3, 4) are formed with different axial lengths from each other.
    Type: Application
    Filed: June 8, 2012
    Publication date: September 27, 2012
    Applicant: NTN CORPORATION
    Inventors: Masaharu Hori, Masaaki Toda, Kenji Hibi, Tetsuya Yamamoto
  • Patent number: 8215843
    Abstract: A fluid dynamic bearing device includes a bearing sleeve including a radial bearing surface, a shaft member to be inserted to an inner circumference of the bearing member, and a radial bearing part for non-contact supporting the shaft member in a radial direction by a dynamic pressure action of a fluid generated in a radial bearing gap between the radial bearing surface of the bearing member and an outer circumferential surface of the shaft member. Additionally, a plurality of bearing sleeves are axially arranged, and each bearing sleeve is formed having different axial length with respect to one another.
    Type: Grant
    Filed: March 22, 2007
    Date of Patent: July 10, 2012
    Assignee: NTN Corporation
    Inventors: Masaharu Hori, Masaaki Toda, Kenji Hibi, Tetsuya Yamamoto
  • Publication number: 20120093447
    Abstract: A shaft member for a fluid dynamic bearing device that has a recess to cause a dynamic pressure effect of a fluid in a bearing clearance, which is formed on it by rolling, and where a surface layer portion of the recess and a surface layer portion of a surrounding region of the recess has a nitride layer, and where nitrogen is diffused and penetrated in a material of the shaft member that is formed by nitriding after the rolling.
    Type: Application
    Filed: October 25, 2011
    Publication date: April 19, 2012
    Applicant: NTN CORPORATION
    Inventors: Kenji Hibi, Yasuhiro Yamamoto
  • Patent number: 8104963
    Abstract: Provided is a shaft member for a fluid dynamic bearing device, which is excellent in wear resistance and which can exert a high dynamic pressure effect. A shaft material (11) is rolled to form a recess (7) for causing a dynamic pressure effect of a lubricating oil in a radial bearing clearance (6). In this case, in a surface layer portion (14) of the recess (7) to be formed in an outer peripheral surface (11a) of the shaft material (11), a first hardened layer (14a) is formed by rolling. At the same time, also in a surface layer portion (15) of a surrounding region (8) of the recess (7), a first hardened layer (15a) is formed by rolling at a partial region thereof. After the recess (7) is formed by the rolling, barreling is applied to the shaft material (11). As a result, an outermost surface layer portion of the surface layer portion (15) is formed with a second hardened layer (15b) by the barreling.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: January 31, 2012
    Assignee: NTN Corporation
    Inventors: Kenji Hibi, Yasuhiro Yamamoto
  • Publication number: 20110317949
    Abstract: A sintered metal bearing is obtained by compression-molding of a raw-material powder containing at least a Cu powder, an SUS powder, and a pure Fe powder and thereafter sintering a compression-molded body at a predetermined temperature.
    Type: Application
    Filed: March 2, 2010
    Publication date: December 29, 2011
    Applicant: NTN CORPORATION
    Inventors: Fuyuki Ito, Kazuo Okamura, Kenji Hibi
  • Patent number: 8052328
    Abstract: A sliding bearing includes a metal part formed by electroforming on an inner periphery of the sliding bearing and an oil feeding mechanism for supplying oil to the bearing gap. As a result, oil retained by the oil feeding mechanism is supplied to the bearing gap, so the lubricity between the bearing and the shaft member is improved by an oil film formed in the bearing gap. This makes it possible to avoid the generation of noise due to defective lubrication and wear of members due to the contact sliding between the bearing and the shaft member.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: November 8, 2011
    Assignee: NTN Corporation
    Inventor: Kenji Hibi
  • Publication number: 20110216992
    Abstract: Fine particles (6) are retained by an electroformed portion (4) in a dispersed state, and the fine particles (6) exposed from an outer peripheral surface (4a2) of the electroformed portion (4) are molten so as to form micro projections (60) integrated with a resin portion (5). The micro projections (60) enters into fine-particle traces (4c) formed in the electroformed portion (4) to exert an anchor effect, to thereby increase a fixation force between the resin portion (5) and the electroformed portion (4).
    Type: Application
    Filed: September 11, 2008
    Publication date: September 8, 2011
    Applicant: NTN CORPORATION
    Inventors: Isao Komori, Yasuhiro Yamamoto, Kenji Hibi
  • Publication number: 20100166343
    Abstract: Provided is a shaft member for a fluid dynamic bearing device, which is excellent in wear resistance and which can exert a high dynamic pressure effect. A shaft material (11) is rolled to form a recess (7) for causing a dynamic pressure effect of a lubricating oil in a radial bearing clearance (6). In this case, in a surface layer portion (14) of the recess (7) to be formed in an outer peripheral surface (11a) of the shaft material (11), a first hardened layer (14a) is formed by rolling. At the same time, also in a surface layer portion (15) of a surrounding region (8) of the recess (7), a first hardened layer (15a) is formed by rolling at a partial region thereof. After the recess (7) is formed by the rolling, barreling is applied to the shaft material (11). As a result, an outermost surface layer portion of the surface layer portion (15) is formed with a second hardened layer (15b) by the barreling.
    Type: Application
    Filed: December 26, 2006
    Publication date: July 1, 2010
    Applicant: NTN CORPORATION
    Inventors: Kenji Hibi, Yasuhiro Yamamoto
  • Publication number: 20090285514
    Abstract: Provided is a fluid dynamic bearing device which has excellent moment rigidity and an improved working efficiency in assembling and parts control, and in which a bearing sleeve can be easily manufactured. A plurality of bearing sleeves are axially disposed in the fluid dynamic bearing device. The bearing sleeves (3, 4) are formed with different axial lengths from each other.
    Type: Application
    Filed: March 22, 2007
    Publication date: November 19, 2009
    Applicant: NTN CORPORATION
    Inventors: Masaharu Hori, Masaaki Toda, Kenji Hibi, Tetsuya Yamamoto
  • Publication number: 20090148084
    Abstract: A fluid dynamic bearing device equipped with a shaft member of high strength and capable of maintaining high bearing performance is provided at low cost. A shaft blank (23) has, as an integrated unit, a shaft part (23a) formed of a material of a higher strength than resin, and a protruding part (23b) protruding radially outwards from the shaft part (23a). A shaft member (2) is equipped with the shaft blank (23) and a resin portion (24) covering at least one end surface of the protruding part (23b) of the shaft blank (23) and facing a thrust bearing gap.
    Type: Application
    Filed: June 2, 2006
    Publication date: June 11, 2009
    Inventors: Isao Komori, Kenji Hibi, Yasuhiro Yamamoto
  • Publication number: 20090110339
    Abstract: A sliding bearing according to the present invention includes a metal part formed by electroforming on an inner periphery of the sliding bearing and an oil feeding mechanism for supplying oil to the bearing gap. As a result, oil retained by the oil feeding mechanism is supplied to the bearing gap, so the lubricity between the bearing and the shaft member is improved by an oil film formed in the bearing gap, making it possible to avoid generation of noise due to defective lubrication and wear of members due to the contact sliding between the bearing and the shaft member.
    Type: Application
    Filed: September 21, 2006
    Publication date: April 30, 2009
    Inventors: Kenji Hibi, Yasuhiro Yamamoto, Kenji Ito
  • Publication number: 20090103840
    Abstract: A different-diameter clearance of high accuracy is created at low cost, thereby improving the bearing performance and the sealing capability. An inner periphery 5a of a molded part 5 having a step from an inner periphery 4a of an electroformed part 4 is molded to a nonconductive coating 9 which covers the surface of a master 8. When the nonconductive coating 9 is removed, a radial clearance 7 having a diameter greater than that of a bearing clearance 6 is created between the inner periphery 5a of the molded part 5, which is exposed to the interior, and an outer periphery 2a of a shaft member 2.
    Type: Application
    Filed: September 5, 2006
    Publication date: April 23, 2009
    Applicant: NTN CORPORATION
    Inventors: Kenji Hibi, Yasuhiro Yamamoto, Tetsuya Yamamoto, Mitsuo Sasabe
  • Publication number: 20090046960
    Abstract: A fluid dynamic bearing device which can exhibit high bearing performance is provided at low costs by forming a highly accurate bearing gap. At least a region in the outer circumferential surface of a shaft 2 which faces the radial bearing gap is constituted of an electroformed part 11, and the region of the shaft 2 excluding the electroformed part 11 is constituted of a resin portion 12.
    Type: Application
    Filed: February 16, 2007
    Publication date: February 19, 2009
    Applicant: NTN CORPORATION
    Inventors: Kenji Hibi, Kenji Ito, Yasuhiro Yamamoto, Hiroshi Niwa, Isao Komori, Tetsuya Yamamoto
  • Patent number: 7485990
    Abstract: The power supply controller serves to distribute electric power to each part of the electronic apparatus for operation, and the electric power can be fed from the AC power source, the fuel cell unit and the secondary battery unit. The power supply controller transmits the data signal indicating from which of the AC power source, the fuel cell unit and the secondary battery unit, the electricity is fed, to the CPU via the built-in register. The CPU displays the use status of the AC power source, the fuel cell unit and the secondary battery unit on the LCD via the display controller.
    Type: Grant
    Filed: February 27, 2004
    Date of Patent: February 3, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akihiro Ozeki, Takashi Fujimoto, Kenji Hibi, Koji Nakamura, Hideo Kumagai, Ryoji Ninomiya