Patents by Inventor Kazuo Ojima
Kazuo Ojima 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: 11496016Abstract: Provided is a rotor capable of improving the reliability of a connection between a lead conductor and a terminal member. A stator includes a winding wound around a stator core and having a lead conductor at an end thereof, and a terminal member having a connection portion to the lead conductor of the winding. The connection portion of the terminal member includes a winding-side connection portion that fixes the lead conductor, and a leading-end-side connection portion that fixes a portion closer to a leading end of the lead conductor than the winding-side connection portion.Type: GrantFiled: November 25, 2016Date of Patent: November 8, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Tomohiro Fukuda, Kenichi Nakayama, Motoo Kitahara, Kazuo Ojima
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Patent number: 11088583Abstract: Provided are a rotary-electric-machine stator coil, a rotary-electric-machine stator having the same, and a rotary electric machine having the same, capable of improving a bonding strength and insulation reliability of a conductor bonding portion. A rotary-electric-machine stator coil includes: a conductor 110 having a bonding portion 104 bonded to other conductors; and a bonding member 401 having a melting point lower than a melting point of the conductor, wherein a tip of the bonding portion has an alloy layer 402 formed of an alloy of the conductor and the bonding member, and a root of the bonding portion is electrically connected by the bonding member.Type: GrantFiled: November 18, 2015Date of Patent: August 10, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Tomohiro Fukuda, Kenichi Nakayama, Kazuo Ojima, Shin Onose, Hisaya Shimizu, Shinji Yamazaki
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Patent number: 10193409Abstract: Provided is a stator for a rotating electric machine equipped with a connection terminal having high manufacturability and vibration resistance; also provided is a rotating electric machine equipped with this stator. The stator, which is for a rotating electric machine equipped with a stator coil, is equipped with a connection terminal. The connection terminal has a crimping part to which stator coil input/output coil conductors are connected, and a fastening part which is mechanically connected to an external mechanism, with a melt material arranged on the fastening part. The input/output coil conductors are configured so as to be connected to the connection terminal, with the melt material provided on the crimping part therebetween.Type: GrantFiled: November 26, 2014Date of Patent: January 29, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kenichi Nakayama, Tomohiro Fukuda, Hisaya Shimizu, Shin Onose, Kazuo Ojima
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Publication number: 20190006904Abstract: Provided is a rotor capable of improving the reliability of a connection between a lead conductor and a terminal member. A stator includes a winding wound around a stator core and having a lead conductor at an end thereof, and a terminal member having a connection portion to the lead conductor of the winding. The connection portion of the terminal member includes a winding-side connection portion that fixes the lead conductor, and a leading-end-side connection portion that fixes a portion closer to a leading end of the lead conductor than the winding-side connection portion.Type: ApplicationFiled: November 25, 2016Publication date: January 3, 2019Inventors: Tomohiro FUKUDA, Kenichi NAKAYAMA, Motoo KITAHARA, Kazuo OJIMA
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Patent number: 9906086Abstract: A rotating electric machine having downsized coil ends is provided. In a rotating electric machine having a stator 130 including a stator core 132 formed with a plurality of slots 420 rowed in a circumferential direction and a stator coil 138 inserted into the slots of the stator core, and a rotor 150 disposed rotatably with respect to the stator core with a clearance interposed therebetween. The stator coil is formed by a plurality of segment coils 28 being connected, the segment coils 28 being made of a conductor shaped into a rough U-shape and having a rectangular cross-section. The segment coil has at an end a connection portion 800 connected to another segment coil, the connection portion having a corner portion 810.Type: GrantFiled: July 29, 2013Date of Patent: February 27, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Kenichi Nakayama, Tomohiro Fukuda, Masamichi Kase, Hiroshi Matahira, Kazuo Ojima, Dai Nakamura, Shin Onose, Mitsuaki Mirumachi, Hisaya Shimizu
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Publication number: 20170346358Abstract: Provided are a rotary-electric-machine stator coil, a rotary-electric-machine stator having the same, and a rotary electric machine having the same, capable of improving a bonding strength and insulation reliability of a conductor bonding portion. A rotary-electric-machine stator coil includes: a conductor 110 having a bonding portion 104 bonded to other conductors; and a bonding member 401 having a melting point lower than a melting point of the conductor, wherein a tip of the bonding portion has an alloy layer 402 formed of an alloy of the conductor and the bonding member, and a root of the bonding portion is electrically connected by the bonding member.Type: ApplicationFiled: November 18, 2015Publication date: November 30, 2017Inventors: Tomohiro FUKUDA, Kenichi NAKAYAMA, Kazuo OJIMA, Shin ONOSE, Hisaya SHIMIZU, Shinji YAMAZAKI
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Patent number: 9745646Abstract: The purpose of this invention is to achieve an electric air flow control device comprising a motor rotor bearing structure having excellent wear resistance even with loads from striking caused by a high vibrational environment specific to an internal combustion engine. A cylindrical sintered metal slide bearing is used in at least one of a front bearing (16) and a rear bearing (17) that support a rotor shaft (14) of a motor (3) that is the rotary control drive source of a throttle valve (7) that controls the intake air flow to an internal combustion engine, and the bearing design is such that the relationship of the radial crushing strength and the compressive deformation rate of the cylindrical sintered metal bearing has the mechanical properties of a maximum radial crushing strength of 230 N/mm2 or greater and a maximum compressive deformation rate of 3.5% or greater at the maximum radial crushing strength.Type: GrantFiled: May 26, 2014Date of Patent: August 29, 2017Assignee: Hitachi Automotive Systems, Ltd.Inventors: Daisuke Hiranuma, Masahiro Mokuo, Kazuo Ojima, Noboru Baba
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Publication number: 20160329773Abstract: Provided is a stator for a rotating electric machine equipped with a connection terminal having high manufacturability and vibration resistance; also provided is a rotating electric machine equipped with this stator. The stator, which is for a rotating electric machine equipped with a stator coil, is equipped with a connection terminal. The connection terminal has a crimping part to which stator coil input/output coil conductors are connected, and a fastening part which is mechanically connected to an external mechanism, with a melt material arranged on the fastening part. The input/output coil conductors are configured so as to be connected to the connection terminal, with the melt material provided on the crimping part therebetween.Type: ApplicationFiled: November 26, 2014Publication date: November 10, 2016Inventors: Kenichi NAKAYAMA, Tomohiro FUKUDA, Hisaya SHIMIZU, Shin ONOSE, Kazuo OJIMA
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Publication number: 20160201578Abstract: The purpose of this invention is to achieve an electric air flow control device comprising a motor rotor bearing structure having excellent wear resistance even with loads from striking caused by a high vibrational environment specific to an internal combustion engine. A cylindrical sintered metal slide bearing is used in at least one of a front bearing (16) and a rear bearing (17) that support a rotor shaft (14) of a motor (3) that is the rotary control drive source of a throttle valve (7) that controls the intake air flow to an internal combustion engine, and the bearing design is such that the relationship of the radial crushing strength and the compressive deformation rate of the cylindrical sintered metal bearing has the mechanical properties of a maximum radial crushing strength of 230 N/mm2 or greater and a maximum compressive deformation rate of 3.5% or greater at the maximum radial crushing strength.Type: ApplicationFiled: May 26, 2014Publication date: July 14, 2016Applicant: Hitachi Automotive Systems, Ltd.Inventors: Daisuke HIRANUMA, Masahiro MOKUO, Kazuo OJIMA, Noboru BABA
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Publication number: 20150222155Abstract: A rotating electric machine having downsized coil ends is provided. In a rotating electric machine having a stator 130 including a stator core 132 formed with a plurality of slots 420 rowed in a circumferential direction and a stator coil 138 inserted into the slots of the stator core, and a rotor 150 disposed rotatably with respect to the stator core with a clearance interposed therebetween. The stator coil is formed by a plurality of segment coils 28 being connected, the segment coils 28 being made of a conductor shaped into a rough U-shape and having a rectangular cross-section. The segment coil has at an end a connection portion 800 connected to another segment coil, the connection portion having a corner portion 810.Type: ApplicationFiled: July 29, 2013Publication date: August 6, 2015Inventors: Kenichi Nakayama, Tomohiro Fukuda, Masamichi Kase, Hiroshi Matahira, Kazuo Ojima, Dai Nakamura, Shin Onose, Mitsuaki Mirumachi, Hisaya Shimizu
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Patent number: 7468554Abstract: A heat sink board having a first heat sink and a second heat sink with a smaller linear expansion coefficient than that of the first heat sink and being bonded to the first heat sink to form the heat sink board. The second heat sink is fitted to the first heat sink, and a material of the first heat sink in the vicinity of a boundary between the fitted heat sinks is plastically deformed for close adhesion to the second heat sink. A forming method makes bonding between the first and second heat sinks possible at room temperature, and the heat sink board made of a composite member having a high flat-surface accuracy can be easily and reliably obtained.Type: GrantFiled: March 11, 2005Date of Patent: December 23, 2008Assignee: Hitachi, Ltd.Inventors: Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima, Masayuki Kobayashi
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Publication number: 20080179732Abstract: A method comprising constraining a circumference of a blank of a Cu—Mo alloy and one of surfaces to be worked with the use of a die, and using a working punch or a counter punch to apply working pressures to the other of the surfaces to be worked, thereby obtaining a cup-shaped body.Type: ApplicationFiled: October 30, 2007Publication date: July 31, 2008Applicant: HITACHI LTD.Inventors: Masayuki Kobayashi, Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima
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Publication number: 20070147005Abstract: The invention provides a heat sink board and a manufacturing method thereof, which can realize a high product accuracy and superior productivity. To that end, a second heat sink (3) having a smaller linear expansion coefficient than that of a first heat sink (2) is bonded to the first heat sink (2) to form a heat sink board. The second heat sink (3) is fitted to the first heat sink (2), and a material of the first heat sink (2) in the vicinity of a boundary between the fitted heat sinks is plastically deformed for close adhesion to the second heat sink (3). Such a forming method makes bonding between the first and second heat sinks possible at room temperature, and the heat sink board made of a composite member having a high flat-surface accuracy can be easily and reliably obtained.Type: ApplicationFiled: March 11, 2005Publication date: June 28, 2007Applicant: HITACHI LTD.Inventors: Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima, Masayuki Kobayashi
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Publication number: 20060248696Abstract: A method comprising constraining a circumference of a blank of a Cu—Mo alloy and one of surfaces to be worked with the use of a die, and using a working punch or a counter punch to apply working pressures to the other of the surfaces to be worked, thereby obtaining a cup-shaped body.Type: ApplicationFiled: May 22, 2006Publication date: November 9, 2006Applicant: HITACHI LTD.Inventors: Masayuki Kobayashi, Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima
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Publication number: 20050178441Abstract: Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection apparatus, in which occurrence of corrosion and attrition caused by cavitation or erosion can be suppressed, their resistance against the environment can be improved, and an excellent lifetime can be achieved in the case of the use of an aluminum material even if the temperature reaches as high as 100° C. or higher and the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating film plated with Ni—P or a Ni—P based material is formed by electroless plating.Type: ApplicationFiled: April 12, 2005Publication date: August 18, 2005Applicant: HITACHI, LTD.Inventors: Shizuka Yamaguchi, Noboru Baba, Masaya Takahasi, Katsuyoshi Terakado, Arata Kagiyama, Masayoshi Kotaki, Shogo Sawada, Kazuo Ojima, Hiroyuki Yamada, Hideki Machimura, Yukio Takahashi
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Patent number: 6895992Abstract: Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection apparatus, in which occurrence of corrosion and attrition caused by cavitation or erosion can be suppressed, their resistance against the environment can be improved, and an excellent lifetime can be achieved in the case of the use of an aluminum material even if the temperature reaches as high as 100° C. or higher and the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating film plated with Ni—P or a Ni—P based material is formed by electroless plating.Type: GrantFiled: October 30, 2002Date of Patent: May 24, 2005Assignee: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Masaya Takahashi, Katsuyoshi Terakado, Arata Kagiyama, Masayoshi Kotaki, Shogo Sawada, Kazuo Ojima, Hiroyuki Yamada, Hideki Machimura, Yukio Takahashi
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Patent number: 6860255Abstract: A fuel pump, of which sliding mechanism parts in its fuel chamber have good wear resistance under a severe environment, and a direct fuel injection engine using the fuel pump are provided. In a fuel pump for pressurizing and delivering fuel to a fuel injector of a vehicle engine, at least one of sliding surfaces of a slant plate, a slipper and a plunger sliding in a lubricating oil and at least one of sliding surfaces of sliding members of a plunger and a cylinder contacting with and sliding on each other through the fuel are formed of a hardened layer composed of any one of a nitrided layer, a carburization quenched layer and a carbonitrided layer, or coated with a high corrosion resistant and hard metal compound layer over the hardened layer.Type: GrantFiled: February 28, 2002Date of Patent: March 1, 2005Assignee: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Toshiaki Nagayama, Katsuyoshi Terakado, Arata Kagiyama, Hideki Machimura, Hiroyuki Yamada, Yukio Takahashi, Masayoshi Kotaki, Kazuo Ojima
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Patent number: 6793468Abstract: A turbocharger for an internal combustion engine, in which a bearing having excellent abrasion resistance without generating a black corrosion product in a high-temperature oil environment is provided. As bearing materials of a turbocharger, a copper alloy material containing, as main components, Cu, Zn, Al, Mn, and Si is employed. The elongating direction of an Mn—Si compound crystallized in the alloy material is set to the axial direction of a rotary shaft with respect to a radial bearing and is set to the direction perpendicular to the rotary shaft with respect to a thrust bearing.Type: GrantFiled: February 28, 2002Date of Patent: September 21, 2004Assignee: Hitachi, Ltd.Inventors: Kazuo Ojima, Noboru Baba, Toshikatsu Akiyama, Katsuhiro Komuro, Tetsuo Udagawa
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Publication number: 20040147083Abstract: A method comprising constraining a circumference of a blank of a Cu—Mo alloy and one of surfaces to be worked with the use of a die, and using a working punch or a counter punch to apply working pressures to the other of the surfaces to be worked, thereby obtaining a cup-shaped body.Type: ApplicationFiled: January 9, 2004Publication date: July 29, 2004Applicant: Hitachi, Ltd.Inventors: Masayuki Kobayashi, Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima
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Publication number: 20040003713Abstract: Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection apparatus, in which occurrence of corrosion and attrition caused by cavitation or erosion can be suppressed, their resistance against the environment can be improved, and an excellent lifetime can be achieved in the case of the use of an aluminum material even if the temperature reaches as high as 100° C. or higher and the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating film plated with Ni—P or a Ni—P based material is formed by electroless plating.Type: ApplicationFiled: October 30, 2002Publication date: January 8, 2004Applicant: Hitachi, Ltd.Inventors: Shizuka Yamaguchi, Noboru Baba, Masaya Takahahsi, Katsuyoshi Terakado, Arata Kagiyama, Masayoshi Kotaki, Shogo Sawada, Kazuo Ojima, Hiroyuki Yamada, Hideki Machimura, Yukio Takahashi