Patents by Inventor Yasunaga Hamada
Yasunaga Hamada 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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Publication number: 20190013710Abstract: Provided is a rotary electric machine in which lengths of routing portions of coil terminals are made uniform and a coil terminal portion is downsized. A rotary electric machine includes a rotor and a stator, the stator including teeth each wound with a coil, in which the coil consists of a first coil set and a second coil set, each of the first coil set and the second coil set is continuously wound around the two teeth, and includes a first coil terminal, and a second coil terminal to which a routing portion is formed, the first coil terminal of each of the first coil set and the second coil set is directly connected to the second coil terminal of another of the first coil set and the second coil set, the first coil terminal and the second coil terminal of each of the first coil set and the second coil set are arranged on an identical coil end, and the second coil terminal of each of the first coil set and the second coil set is arranged not to cross any other coil terminal in an axial direction.Type: ApplicationFiled: December 2, 2016Publication date: January 10, 2019Inventors: Shozo KAWASAKI, Hiroshi KANAZAWA, Yasunaga HAMADA, Kenji NAKAYAMA, Koichi KASHIWA, Masahiro HOSOYA
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Patent number: 10069362Abstract: In a rotating electrical machine, in the case where a cylindrical component is fixed by press fitting or the like, the opening edge of the cylindrical component is widened toward the end to provide peeps for facilitating the insertion of the cylindrical component. However, the outer shape of a rotor expands due to the peeps, and a gap needs to be provided between the rotor and a stator in consideration of the expanded portion of the outer shape, which causes the degradation of the performance of the rotating electrical machine. In addition, in the case where magnets are fixed only by the tightening force of a magnet cover, the greater the centrifugal force becomes, the larger the clamping margin becomes and similarly the larger the peeps become, and thus the expanded portion also becomes larger. However, if the opening edge is not widened to the end, the absence of the peeps makes it difficult to insert the magnet cover.Type: GrantFiled: March 10, 2014Date of Patent: September 4, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Shozo Kawasaki, Hiroshi Kanazawa, Koichi Kashiwa, Kenji Nakayama, Yasunaga Hamada
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Publication number: 20160141930Abstract: A rotor for an electric power steering motor is configured to include a rotor core having a step skew structure constituted of two independent cores as well as to use shrink fitting to fasten the two cores to a shaft. It may also be configured such that a magnetic center of the rotor core is adjusted by controlling a dimension thereof from a tip of the shaft and by shrink fitting the two cores.Type: ApplicationFiled: October 15, 2015Publication date: May 19, 2016Inventors: Hiroshi KANAZAWA, Shozo KAWASAKI, Kenji NAKAYAMA, Yasunaga HAMADA, Koichi KASHIWA, Masahiro HOSOYA
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Publication number: 20160126793Abstract: In a rotating electrical machine, in the case where a cylindrical component is fixed by press fitting or the like, the opening edge of the cylindrical component is widened toward the end to provide peeps for facilitating the insertion of the cylindrical component. However, the outer shape of a rotor expands due to the peeps, and a gap needs to be provided between the rotor and a stator in consideration of the expanded portion of the outer shape, which causes the degradation of the performance of the rotating electrical machine. In addition, in the case where magnets are fixed only by the tightening force of a magnet cover, the greater the centrifugal force becomes, the larger the clamping margin becomes and similarly the larger the peeps become, and thus the expanded portion also becomes larger. However, if the opening edge is not widened to the end, the absence of the peeps makes it difficult to insert the magnet cover.Type: ApplicationFiled: March 10, 2014Publication date: May 5, 2016Inventors: Shozo KAWASAKI, Hiroshi KANAZAWA, Koichi KASHIWA, Kenji NAKAYAMA, Yasunaga HAMADA
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Publication number: 20140145542Abstract: In an electrical actuator having a motor in which a plurality of teeth including a continuous winding are formed into a stator core of a ring shape, one wire being continuously wound around the teeth adjacent to each other in the continuous winding, the stator core is configured that step sections of an uneven shape in the axial direction are arranged in butting sections between the teeth connected by the continuous winding, and the uneven shapes are fitted to each other.Type: ApplicationFiled: November 14, 2013Publication date: May 29, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Hiroshi KANAZAWA, Hirotaka TAKIMOTO, Koichi KASHIWA, Masahiro HOSOYA, Yasunaga HAMADA, Shozo KAWASAKI, Kenji NAKAYAMA
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Publication number: 20140132197Abstract: In an electrical actuator, the number of piece of an inverter is made one in order to miniaturize a control circuit suitable to a mechanically and electrically integrate type, a motor is configured to include two independent three-phase windings thereinside, and motor relays are disposed at neutral points of the independent three-phase windings.Type: ApplicationFiled: November 6, 2013Publication date: May 15, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Hiroshi KANAZAWA, Junnosuke NAKATSUGAWA, Shozo KAWASAKI, Yasunaga HAMADA, Kenji NAKAYAMA
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Publication number: 20140084755Abstract: An on-vehicle rotary electric machine includes a first member provided with a stator, a rotor, and a housing in which the stator and the rotor is housed, a second member adjacent to the first member in an axial direction, and a third member adjacent to the second member in the axial direction at an opposite side of the first member, and the first member, the second member, and the third member are pierced by a through bolt in the axial direction and are fixed.Type: ApplicationFiled: August 20, 2013Publication date: March 27, 2014Applicant: Hitachi Automotive System, Ltd.Inventors: Yasunaga HAMADA, Kenji NAKAYAMA, Shozo KAWASAKI, Hiroshi KANAZAWA
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Publication number: 20140009041Abstract: Inner rings of bearings arranged at both ends of a rotor shaft are fixed to the rotor shaft, and outer rings of both of the bearings are arranged at bearing holding parts movably in an axial direction of the rotor. A preload imparting member is attached to one of the bearings, the preload imparting member being configured to bias the rotor shaft in one direction and to apply a biasing force to make a housing and a flange, which constitute a chassis, come close to each other.Type: ApplicationFiled: July 8, 2013Publication date: January 9, 2014Inventors: Shozo KAWASAKI, Junnosuke NAKATSUGAWA, Kenji NAKAYAMA, Hiroshi KANAZAWA, Yasunaga HAMADA
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Publication number: 20130264140Abstract: An electrical motor includes: a cylindrical stator core arranged so as to surround a periphery of a rotor via a space, and having a plurality of teeth formed in an inner periphery thereof; a bobbin installed in each of the plurality of teeth; a coil wound around each of the bobbins installed in the teeth; a bottomed cylindrical chassis having a bottom faced with one of end portions in the axial direction of the stator core, and holding an outer periphery of the stator core; and a busbar mold provided with a busbar terminal. An engaging hole is formed at least in either the bottom or the busbar mold at a position facing the bobbin, and an engaging projection that engages with the engaging hole is formed in an opposing part that faces the engaging hole in the bobbin.Type: ApplicationFiled: April 4, 2013Publication date: October 10, 2013Applicant: Hitachi Automotive Systems, Ltd.Inventors: Kenji NAKAYAMA, Shozo KAWASAKI, Hiroshi KANAZAWA, Yasunaga HAMADA
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Publication number: 20130257200Abstract: An in-vehicle motor includes a busbar for connecting plural concentrated-winding stator coils. The busbar includes: an arm extending perpendicular to a longitudinal direction of the busbar; a coil holder provided at a tip of the arm; and a mechanically-twisted portion provided on the arm.Type: ApplicationFiled: February 15, 2013Publication date: October 3, 2013Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Kenji NAKAYAMA, Shozo KAWASAKI, Hiroshi KANAZAWA, Junnosuke NAKATSUGAWA, Yasunaga HAMADA
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Patent number: 8033714Abstract: A cylinder-shaped flow passage in which a first fluid flows includes an internal cylinder which is smaller in diameter than the flow passage. A swirl-generating stator having four vanes is radially fixed in the internal cylinder. A header space for supplying a second fluid is provided to the outer circumference of a wall surface of the internal cylinder in contact with flow separation areas which are formed along downstream surfaces of the swirl-generating stator as the first fluid runs into the swirl-generating stator. The wall surface of the internal cylinder is formed with openings through which the flow separation areas communicate with the header space. The second fluid supplied into the header space flows through the openings into the flow separation areas, and is diffused along the vanes of the swirl-generating stator to be swirled and mixed into the first fluid applied with swirling force by the swirl-generating stator.Type: GrantFiled: April 27, 2006Date of Patent: October 11, 2011Assignees: Hitachi High-Technologies Corporation, Babcock-Hitachi K.K.Inventors: Akira Nishioka, Kiyoshi Amou, Yoshihiro Sukegawa, Takehiko Kowatari, Yasunaga Hamada, Ikuhisa Hamada, Toshifumi Mukai, Yoshinori Taguchi, Hiroshi Yokota
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Publication number: 20100263632Abstract: Even when a current waveform and a current value of a current which is supplied to an injector is changed in order to extend a dynamic range of the injector, fuel injection quantity precision is maintained and enhanced. A correction time for correcting an opening/closing delay of the aforementioned injector is variably set by a valve response delay time calculating unit 103 and a selector unit 106 in accordance with change of setting of the current waveform and the current value.Type: ApplicationFiled: April 20, 2010Publication date: October 21, 2010Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takao MIYAKE, Masahiro Toyohara, Yasunaga Hamada
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Publication number: 20070036694Abstract: An exhaust aftertreatment system comprises an injector for injecting urea water into an exhaust duct, and a denitration catalyst disposed downstream of the injector with respect to a flow of exhaust gas. The exhaust aftertreatment system reduces nitrogen oxides in the exhaust gas by the denitration catalyst while using ammonia produced from the urea water injected from the injector. The urea water is injected along a direction of the flow of the exhaust gas within the exhaust duct, and a porous plate is disposed in multiple stages in a space of the exhaust duct such that droplets of the injected urea water impinge against the porous plate before reaching a wall surface of the exhaust duct. A surface of the porous plate subjected to the impingement of the droplets is arranged to face downstream with respect to the flow of the exhaust gas.Type: ApplicationFiled: July 27, 2006Publication date: February 15, 2007Applicants: Hitachi, Ltd., Babcock-Hitachi K.K., Hitachi High-Technologies CorporationInventors: Akira Nishioka, Kiyoshi Amou, Yoshihiro Sukegawa, Takehiko Kowatari, Yasunaga Hamada, Ikuhisa Hamada, Toshifumi Mukai, Yoshinori Taguchi, Hiroshi Yokota
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Publication number: 20070007477Abstract: In an electromagnetic fuel injector of an internal combustion engine, an electromagnetic coil for valve driving is to be wound on a bobbin, and the bobbin is constituted by a synthetic resin containing a filler having good heat conductivity. For example, the bobbin with the coil to be wound thereon is constituted by PPS containing iron oxide and/or alumina as a filler. Two types of electromagnetic coils different in characteristics are provided in the fuel injector. These coils are wound separately on one bobbin in an axial direction. Among them, one coil (hereinafter referred to as “first coil”) has a winding region near a movable unit with a valve element being the object of magnetic suction, and other-coil (hereinafter referred to as “second coil”) has a winding region away from the movable unit.Type: ApplicationFiled: September 13, 2006Publication date: January 11, 2007Applicants: HITACHI LTD., HITACHI CAR ENGINEERING CO., LTD.Inventors: Yasunaga Hamada, Yasuo Namaizawa
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Publication number: 20060245296Abstract: A cylinder-shaped flow passage in which a first fluid flows includes an internal cylinder which is smaller in diameter than the flow passage. A swirl-generating stator having four vanes is radially fixed in the internal cylinder. A header space for supplying a second fluid is provided to the outer circumference of a wall surface of the internal cylinder in contact with flow separation areas which are formed along downstream surfaces of the swirl-generating stator as the first fluid runs into the swirl-generating stator. The wall surface of the internal cylinder is formed with openings through which the flow separation areas communicate with the header space. The second fluid supplied into the header space flows through the openings into the flow separation areas, and is diffused along the vanes of the swirl-generating stator to be swirled and mixed into the first fluid applied with swirling force by the swirl-generating stator.Type: ApplicationFiled: April 27, 2006Publication date: November 2, 2006Applicants: Hitachi, Ltd., Hitachi High-Technologies Corporation, Babcock-Hitachi K.K.Inventors: Akira Nishioka, Kiyoshi Amou, Yoshihiro Sukegawa, Takehiko Kowatari, Yasunaga Hamada, Ikuhisa Hamada, Toshifumi Mukai, Yoshinori Taguchi, Hiroshi Yokota
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Patent number: 6834844Abstract: An electromagnetic fuel injector of an internal combustion engine having a plurality of electromagnetic coils for valve driving wound separately on a bobbin in an axial direction. The bobbin has a step difference of the outer diameter so that the bobbin outer diameter in the region with the second coil to be wound thereon is smaller then the bobbin outer diameter in the region with the first coil to be wound thereon, and the bobbin inner diameter has a step difference in that the bobbin inner diameter in the region with the first coil to be wound thereon is made large partially so as to secure an annular space to interpose a seal ring therein.Type: GrantFiled: September 13, 2001Date of Patent: December 28, 2004Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Yasunaga Hamada, Yasuo Namaizawa
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Publication number: 20040108395Abstract: In an electromagnetic fuel injector of an internal combustion engine, an electromagnetic coil for valve driving is to be wound on a bobbin, and the bobbin is constituted by a synthetic resin containing a filler having good heat conductivity. For example, the bobbin with the coil to be wound thereon is constituted by PPS containing iron oxide and/or alumina as a filler. Two types of electromagnetic coils different in characteristics are provided in the fuel injector. These coils are wound separately on one bobbin in an axial direction. Among them, one coil (hereinafter referred to as “first coil”) has a winding region near a movable unit with a valve element being the object of magnetic suction, and other coil (hereinafter referred to as “second coil”) has a winding region away from the movable unit.Type: ApplicationFiled: December 5, 2003Publication date: June 10, 2004Applicants: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Yasunaga Hamada, Yasuo Namaizawa
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Patent number: 6634338Abstract: An electromagnetic fuel injector is provided with a first coil having a large rate of change in time of magnetomotive force and a second coil having a smaller rate of change in time of magnetomotive force than the first coil. During a valve opening operation at the time of opening the valve, current is passed through at least the first coil, and then current of a smaller current value than in the opening operation is caused to flow so as to hold the valve open, using the first and second coils.Type: GrantFiled: March 20, 2000Date of Patent: October 21, 2003Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Makoto Yamakado, Kiyoshi Amou, Yoshio Okamoto, Yuzo Kadomukai, Hiromasa Kubo, Kenji Tabuchi, Toshio Takahata, Yoshiyuki Tanabe, Yasunaga Hamada
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Patent number: 6615805Abstract: A fuel injection apparatus including a controller to output an injection time command signal and an opening movement time command signal to command an opening movement time from a closed state to an open state of an electromagnetic fuel injection valve and a control circuit, coupled to the controller, to change an electric current flowing in a coil of the electromagnetic fuel injection valve between when the electromagnetic fuel injection valve is closed and opened. The controller sends both the injection time command signal and the opening movement time command signal through the same signal line to the control circuit.Type: GrantFiled: July 2, 2002Date of Patent: September 9, 2003Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Makoto Yamakado, Yoshio Okamoto, Nobukatsu Arai, Yuzo Kadomukai, Yoshiyuki Tanabe, Yasunaga Hamada, Yasuo Namaizawa, Hiromasa Kubo, Kenji Tabuchi
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Patent number: 6571773Abstract: The target peak current value, where a current value is reduced in conformity to a drop in the voltage of a battery 18 is stored in target peak current storage unit 68. ON-signals are sent from current control circuit 56 to power transistor 50 in response to the injection command pulse coming from engine controller 58 so that current is applied to coil 20. Then, the current flowing to coil 20 is detected by the current detecting resistor 52. Comparator 62 compares this detected current and the target peak current value read from the target peak current storage unit 68 conforming to the voltage of battery 18. If agreement is found between these two values, OFF-signals are sent to power transistor 50 from current control circuit 56 in response to the switching command coming from comparator 62. Then, On/Off signals to effect holding of the coil 20 are sent from current control circuit 56 to power transistor 50. The linearity of the injection volume despite changes in battery voltage can be maintained.Type: GrantFiled: July 28, 2000Date of Patent: June 3, 2003Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.Inventors: Makoto Yamakado, Yoshiyuki Tanabe, Toshio Takahata, Hiromasa Kubo, Yasunaga Hamada, Yoshio Okamoto, Yuzo Kadomukai