Patents by Inventor Takao Nishioka
Takao Nishioka 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).
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Patent number: 8878642Abstract: There are provided a dust core in which, even if the surface of a heat-treated compact is ground, the insulation between soft magnetic particles on the ground surface can be ensured in the grinding step, and a method for producing the dust core. The method includes a preparation step of preparing a heat-treated compact 100 by compacting soft magnetic particles having an insulation coating and heating the resultant compact to a predetermined temperature; and a machining step of removing part of the heat-treated compact 100 using a working tool 2. The machining step is performed while an electric current is supplied with a conductive fluid 7L between the heat-treated compact 100 serving as an anode and a working tool 2 that machines the heat-treated compact 100 or a first counter electrode 5 that faces the working tool 2 with a distance therebetween, the working tool 2 or the first counter electrode 5 serving as a cathode.Type: GrantFiled: May 16, 2011Date of Patent: November 4, 2014Assignee: Sumitomo Electric Industries, Ltd.Inventors: Tomoyuki Ueno, Takao Nishioka
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Publication number: 20120229244Abstract: There are provided a dust core in which, even if the surface of a heat-treated compact is ground, the insulation between soft magnetic particles on the ground surface can be ensured in the grinding step, and a method for producing the dust core. The method includes a preparation step of preparing a heat-treated compact 100 by compacting soft magnetic particles having an insulation coating and heating the resultant compact to a predetermined temperature; and a machining step of removing part of the heat-treated compact 100 using a working tool 2. The machining step is performed while an electric current is supplied with a conductive fluid 7L between the heat-treated compact 100 serving as an anode and a working tool 2 that machines the heat-treated compact 100 or a first counter electrode 5 that faces the working tool 2 with a distance therebetween, the working tool 2 or the first counter electrode 5 serving as a cathode.Type: ApplicationFiled: May 16, 2011Publication date: September 13, 2012Applicant: Sumitomo Electric Industries, ltd.Inventors: Tomoyuki Ueno, Takao Nishioka
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Patent number: 8241518Abstract: A soft magnetic material includes a plurality of composite magnetic particles including a metal magnetic particle and an insulating film surrounding a surface of the metal magnetic particle. The insulating film also contains a phosphate. The soft magnetic material further includes an aromatic polyetherketone resin and a metallic soap and/or an inorganic lubricant having a hexagonal crystal structure. The metallic soap and the inorganic lubricant are particles with an average particle size of not more than 2.0 ?m.Type: GrantFiled: May 15, 2007Date of Patent: August 14, 2012Assignees: Sumitomo Electric Industries, Ltd., Denso Corporation, Sumitomo Electric Sintered Alloy, Ltd.Inventors: Naoto Igarashi, Takao Nishioka, Yoshiyuki Shimada, Tsuyoshi Akao
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Patent number: 7998361Abstract: A soft magnetic material includes: a plurality of composite magnetic particles formed from a metal magnetic particle and an insulative coating surrounding a surface of the metal magnetic particle and containing metallic salt phosphate and/or oxide; and a lubricant formed as fine particles added at a proportion of at least 0.001 percent by mass and no more than 0.1 percent by mass relative to the plurality of composite magnetic particles. With this structure, superior lubrication is provided during compacting and desired magnetic characteristics can be obtained after compacting.Type: GrantFiled: March 29, 2005Date of Patent: August 16, 2011Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kazuhiro Hirose, Haruhisa Toyoda, Takao Nishioka, Naoto Igarashi, Toru Maeda, Yoshiyuki Shimada
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Patent number: 7887647Abstract: A soft magnetic material includes a plurality of composite magnetic particles each including a metal magnetic particle and an insulating coating film covering the metal magnetic particle. Each of the plurality of composite magnetic particles has a ratio Rm/c of a maximum diameter to a circle-equivalent diameter of more than 1.15 and not more than 1.35. The insulating coating film is composed of a thermosetting organic material and has a pencil hardness of 5H or higher after thermosetting. With this material, an eddy current loss can be reduced, and a compact with a high strength can be formed.Type: GrantFiled: September 8, 2006Date of Patent: February 15, 2011Assignee: Sumitomo Electric Industries, Ltd.Inventors: Toru Maeda, Yasushi Mochida, Takao Nishioka
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Patent number: 7758706Abstract: A method for producing a dust core compact includes the steps of forming a compact component by pressure-forming a soft magnetic powder having an average particle diameter Da under a pressure Pa, and forming a compact by pressure-forming a soft magnetic powder having an average particle diameter Db and the compact component under a pressure Pb. Average particle diameters Da and Db of the soft magnetic powders satisfy relationship Da/Db?2, and pressures Pa and Pb applied during the pressure-forming satisfy relationship Pa/Pb?½. With this structure, a method for producing a dust core compact exhibiting a high strength and capable of being fabricated even when it has a complex shape, and the dust core compact can be provided.Type: GrantFiled: September 16, 2005Date of Patent: July 20, 2010Assignees: Sumitomo Electric Industries, Ltd., Toyota Jidosha Kabushiki KaishaInventors: Kazuhiro Hirose, Haruhisa Toyoda, Atsushi Sato, Takao Nishioka, Yasuhiro Endo, Ryoji Mizutani, Kazutaka Tatematsu, Kenji Harada
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Patent number: 7682695Abstract: The object of the present invention is to provide a powder core and method for making the same that is equipped with insulative coating having superior heat resistance, with the coating making it possible to adequately restrict the flow of eddy currents between particles. The powder core is equipped with a plurality of compound magnetic particles bonded to each other. Each of said plurality of composite magnetic particles includes: a metal magnetic particle 10; an insulative lower layer coating 20 surrounding a surface 10a of said metal magnetic particle 10; an upper layer coating 30 surrounding said lower layer coating 20 and containing silicon; and dispersed particles 50 containing a metal oxide compound and disposed in said lower layer coating 20 and/or said upper layer coating 30. A mean particle diameter R of the dispersed particles 50 meets the condition 10 nm<R?2 T, where the average thickness of the coating combining the lower layer coating 20 and the upper layer coating 30 is T.Type: GrantFiled: January 28, 2005Date of Patent: March 23, 2010Assignee: Sumitomo Electric Industries, Ltd.Inventors: Hirokazu Kugai, Naoto Igarashi, Toru Maeda, Kazuhiro Hirose, Haruhisa Toyoda, Koji Mimura, Takao Nishioka
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Patent number: 7678174Abstract: A soft magnetic material has an iron based powder that has an insulating coating on the surface and an ester wax. The ester wax is added in an amount not less than 0.02% by weight and not more than 0.6% by weight in relation to the soft magnetic material. Consequently, seizure between a metal mold and a material to be molded at the time of molding can be suppressed and the arising of a black residue can be prevented.Type: GrantFiled: August 31, 2005Date of Patent: March 16, 2010Assignee: Sumitomo Electric Industries, Ltd.Inventors: Terukazu Tokuoka, Kazuhiro Hirose, Haruhisa Toyoda, Takao Nishioka, Kouhei Sawada
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Patent number: 7641745Abstract: A soft magnetic material used for producing a powder compact has a plurality of iron particles having a Vickers hardness HV of less than 800 and satisfying the relationship of ?/??2.5, where ? represents the specific surface area of the iron particles measured by a gas adsorption method (Brunauer-Emmett-Teller (BET) method) and ? represents the apparent specific surface area of the iron particles calculated from the average particle diameter measured by a laser diffraction/scattering method.Type: GrantFiled: March 29, 2005Date of Patent: January 5, 2010Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kazuhiro Hirose, Haruhisa Toyoda, Takao Nishioka
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Patent number: 7621689Abstract: An attachment coupler is attached to an end of an arm of a working machine. An attachment having two attachment pins in parallel can be detachably attached to the attachment coupler. The attachment coupler includes a first U-shaped portion that engages with and supports one of the attachment pins sideways, and a second U-shaped portion that receives the other attachment pin downwardly. The second U-shaped portion includes a rotary hook that opens and closes the opening of the second U-shaped portion. The rotary hook includes an engagement securing member that engages with and secures the rotary hook when the rotary hook closes the opening of the second U-shaped portion and when the rotary hook opens the opening of the second U-shaped portion, and a bolt securing member that secures the rotary hook with a bolt when the rotary hook closes the opening of the second U-shaped portion.Type: GrantFiled: February 29, 2008Date of Patent: November 24, 2009Assignee: Kabushiki Kaisha Muroto TekkoshoInventors: Takao Nishioka, Yoshihiro Moto
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Patent number: 7601229Abstract: A method for making soft magnetic material includes: a first heat treatment step applying a temperature of at least 400 deg C. and less than 900 deg C. to metal magnetic particles; a step for forming a plurality of compound magnetic particles in which said metal magnetic particles are surrounded by insulation film; and a step for forming a shaped body by compacting a plurality of compound magnetic particles. This provides a method for making soft magnetic material that provides desired magnetic properties.Type: GrantFiled: October 1, 2004Date of Patent: October 13, 2009Assignee: Sumitomo Electric Industries Ltd.Inventors: Haruhisa Toyoda, Hirokazu Kugai, Kazuhiro Hirose, Naoto Igarashi, Takao Nishioka
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Patent number: 7588648Abstract: The present invention provides a soft magnetic material and a powder magnetic core having desired magnetic characteristics. A soft magnetic material contains a metal magnetic powder 10. The metal magnetic powder 10 is formed from crystals 1 with an average size, as determined from X-ray diffraction, of at least 30 nm. It would be preferable, in the metal magnetic particles 10, for crystal grains 2 to have an average size of at least 10 microns.Type: GrantFiled: October 7, 2004Date of Patent: September 15, 2009Assignee: Sumitomo Electric Industries, Inc.Inventors: Haruhisa Toyoda, Hirokazu Kugai, Kazuhiro Hirose, Naoto Igarashi, Takao Nishioka
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Publication number: 20090197782Abstract: A soft magnetic material includes a plurality of composite magnetic particles including a metal magnetic particle and an insulating film surrounding a surface of the metal magnetic particle. The insulating film also contains a phosphate. The soft magnetic material further includes an aromatic polyetherketone resin and a metallic soap and/or an inorganic lubricant having a hexagonal crystal structure. The metallic soap and the inorganic lubricant are particles with an average particle size of not more than 2.0 ?m.Type: ApplicationFiled: May 15, 2007Publication date: August 6, 2009Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., DENSO CORPORATION, SUMITOMO ELECTRIC SINTERED ALLOY, LTD.Inventors: Naoto Igarashi, Takao Nishioka, Yoshiyuki Shimada, Tsuyoshi Akao
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Publication number: 20090129858Abstract: An attachment coupler is attached to an end of an arm of a working machine. An attachment having two attachment pins in parallel can be detachably attached to the attachment coupler. The attachment coupler includes a first U-shaped portion that engages with and supports one of the attachment pins sideways, and a second U-shaped portion that receives the other attachment pin downwardly. The second U-shaped portion includes a rotary hook that opens and closes the opening of the second U-shaped portion. The rotary hook includes an engagement securing member that engages with and secures the rotary hook when the rotary hook closes the opening of the second U-shaped portion and when the rotary hook opens the opening of the second U-shaped portion, and a bolt securing member that secures the rotary hook with a bolt when the rotary hook closes the opening of the second U-shaped portion.Type: ApplicationFiled: February 29, 2008Publication date: May 21, 2009Inventors: Takao Nishioka, Yoshihiro Moto
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Publication number: 20090121175Abstract: A soft magnetic material includes a plurality of composite magnetic particles each including a metal magnetic particle and an insulating coating film covering the metal magnetic particle. Each of the plurality of composite magnetic particles has a ratio Rm/c of a maximum diameter to a circle-equivalent diameter of more than 1.15 and not more than 1.35. The insulating coating film is composed of a thermosetting organic material and has a pencil hardness of 5H or higher after thermosetting. With this material, an eddy current loss can be reduced, and a compact with a high strength can be formed.Type: ApplicationFiled: September 8, 2006Publication date: May 14, 2009Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.Inventors: Toru Maeda, Yasushi Mochida, Takao Nishioka
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Patent number: 7473067Abstract: An attachment coupler includes a first arm and a second arm, each including a U-shaped portion, and upper portions of the first and second arms being swingably connected by a swing shaft, and an expansion-contraction tool which opens and closes the first and second arms around the swing shaft as a fulcrum. A locking member provided with a cam and a hook provided with a cam follower are rotatably provided on the second arm. A state in which a free end of the hook is removed from an opening of the U-shaped portion is maintained by engagement of the cam and the cam follower during contraction of the expansion-contraction tool. The cam follower is driven by the cam along with rotation of the locking member during expansion of the expansion-contraction tool, thereby causing the free end of the hook to advance toward the opening of the U-shaped portion.Type: GrantFiled: February 27, 2007Date of Patent: January 6, 2009Assignee: Kabushiki Kaisha Muroto TekkoshoInventors: Takao Nishioka, Takashi Moriuchi
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Publication number: 20080253917Abstract: A soft magnetic material used for producing a powder compact has a plurality of iron particles having a Vickers hardness HV of less than 800 and satisfying the relationship of ?/??2.5, where ? represents the specific surface area of the iron particles measured by a gas adsorption method (Brunauer-Emmett-Teller (BET) method) and ? represents the apparent specific surface area of the iron particles calculated from the average particle diameter measured by a laser diffraction/scattering method.Type: ApplicationFiled: March 29, 2005Publication date: October 16, 2008Applicant: Sumitomo Electric Industries, Ltd.Inventors: Kazuhiro Hirose, Haruhisa Toyoda, Takao Nishioka
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Publication number: 20080231409Abstract: The object of the present invention is to provide a powder core and method for making the same that is equipped with insulative coating having superior heat resistance, with the coating making it possible to adequately restrict the flow of eddy currents between particles. The powder core is equipped with a plurality of compound magnetic particles bonded to each other. Each of said plurality of composite magnetic particles includes: a metal magnetic particle 10; an insulative lower layer coating 20 surrounding a surface 10a of said metal magnetic particle 10; an upper layer coating 30 surrounding said lower layer coating 20 and containing silicon; and dispersed particles 50 containing a metal oxide compound and disposed in said lower layer coating 20 and/or said upper layer coating 30. A mean particle diameter R of the dispersed particles 50 meets the condition 10 nm<R?2 T, where the average thickness of the coating combining the lower layer coating 20 and the upper layer coating 30 is T.Type: ApplicationFiled: January 28, 2005Publication date: September 25, 2008Applicant: Sumitomo Electric Industries, Ltd.Inventors: Hirokazu Kugai, Naoto Igarashi, Toru Maeda, Kazuhiro Hirose, Haruhisa Toyoda, Koji Mimura, Takao Nishioka
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Publication number: 20080170933Abstract: An attachment coupler includes a first arm and a second arm, each including a U-shaped portion, and upper portions of the first and second arms being swingably connected by a swing shaft, and an expansion-contraction tool which opens and closes the first and second arms around the swing shaft as a fulcrum. A locking member provided with a cam and a hook provided with a cam follower are rotatably provided on the second arm. A state in which a free end of the hook is removed from an opening of the U-shaped portion is maintained by engagement of the cam and the cam follower during contraction of the expansion-contraction tool. The cam follower is driven by the cam along with rotation of the locking member during expansion of the expansion-contraction tool, thereby causing the free end of the hook to advance toward the opening of the U-shaped portion.Type: ApplicationFiled: February 27, 2007Publication date: July 17, 2008Inventors: Takao Nishioka, Takashi Moriuchi
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Publication number: 20080102302Abstract: A method for producing a dust core compact includes the steps of forming a compact component by pressure-forming a soft magnetic powder having an average particle diameter Da under a pressure Pa, and forming a compact by pressure-forming a soft magnetic powder having an average particle diameter Db and the compact component under a pressure Pb. Average particle diameters Da and Db of the soft magnetic powders satisfy relationship Da/Db?2, and pressures Pa and Pb applied during the pressure-forming satisfy relationship Pa/Pb?1/2. With this structure, a method for producing a dust core compact exhibiting a high strength and capable of being fabricated even when it has a complex shape, and the dust core compact can be provided.Type: ApplicationFiled: September 16, 2005Publication date: May 1, 2008Inventors: Kazuhiro Hirose, Haruhisa Toyoda, Atsushi Sato, Takao Nishioka, Yasuhiro Endo, Ryoji Mizutani, Kazutaka Tatematsu, Kenji Harada