Patents by Inventor Yukihiro Maekawa
Yukihiro Maekawa 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: 8247137Abstract: Separators (5A, 5B, 6) and membrane-electrode assemblies (2) of a fuel cell stack (1) are alternately stacked in a guide box (40). The separators (5A, 5B, 6) each have groove-like gas paths (10A, 10B). Powder of an adhesive agent (7) is adhered in advance to the surfaces of the separators (5A, 5B, 6), except the gas paths (10A, 10B), through photosensitive drums (31A, 31B) to which the powder is adsorbed in a given pattern. The separators (5A, 5B, 6) and the membrane-electrode assemblies (2), stacked in the guide box (40), are heated and compressed by a press (43) and heaters (40C) to obtain a unitized fuel cell stack (1).Type: GrantFiled: June 10, 2011Date of Patent: August 21, 2012Assignee: Nissan Motor Co., Ltd.Inventors: Akira Fujiki, Yukihiro Maekawa, Takeharu Kuramochi, Masahiko Katsu, Takayuki Hirao, Takeshi Shimizu, Masanori Iwamoto, Sadao Miki, Haruhiko Suzuki, Yoshiki Muto, Kaoru Eguchi, Masahiro Omata, Hiroshi Saitou
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Publication number: 20110236801Abstract: Separators (5A, 5B, 6) and membrane-electrode assemblies (2) of a fuel cell stack (1) are alternately stacked in a guide box (40). The separators (5A, 5B, 6) each have groove-like gas paths (10A, 10B). Powder of an adhesive agent (7) is adhered in advance to the surfaces of the separators (5A, 5B, 6), except the gas paths (10A, 10B), through photosensitive drums (31A, 31B) to which the powder is adsorbed in a given pattern. The separators (5A, 5B, 6) and the membrane-electrode assemblies (2), stacked in the guide box (40), are heated and compressed by a press (43) and heaters (40C) to obtain a unitized fuel cell stack (1).Type: ApplicationFiled: June 10, 2011Publication date: September 29, 2011Inventors: Akira Fujiki, Yukihiro Maekawa, Takeharu Kuramochi, Masahiko Katsu, Takayuki Hirao, Takeshi Shimizu, Masanori Iwamoto, Sadao Miki, Haruhiko Suzuki, Yoshiki Muto, Kaoru Eguchi, Masahiro Omata, Hiroshi Saitou
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Patent number: 7981572Abstract: Separators (5A, 5B, 6) and membrane-electrode assemblies (2) of a fuel cell stack (1) are alternately stacked in a guide box (40). The separators (5A, 5B, 6) each have groove-like gas paths (10A, 10B). Powder of an adhesive agent (7) is adhered in advance to the surfaces of the separators (5A, 5B, 6), except the gas paths (10A, 10B), through photosensitive drums (31A, 31B) to which the powder is adsorbed in a given pattern. The separators (5A, 5B, 6) and the membrane-electrode assemblies (2), stacked in the guide box (40), are heated and compressed by a press (43) and heaters (40C) to obtain a unitized fuel cell stack (1).Type: GrantFiled: October 28, 2004Date of Patent: July 19, 2011Assignee: Nissan Motor Co., Ltd.Inventors: Akira Fujiki, Yukihiro Maekawa, Takeharu Kuramochi, Masahiko Katsu, Takayuki Hirao, Takeshi Shimizu, Masanori Iwamoto, Sadao Miki, Haruhiko Suzuki, Yoshiki Muto, Kaoru Eguchi, Masahiro Omata, Hiroshi Saitou
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Patent number: 7309465Abstract: A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.Type: GrantFiled: April 5, 2006Date of Patent: December 18, 2007Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
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Publication number: 20070271770Abstract: Separators (5A, 5B, 6) and membrane-electrode assemblies (2) of a fuel cell stack (1) are alternately stacked in a guide box (40). The separators (5A, 5B, 6) each have groove-like gas paths (10A, 10B). Powder of an adhesive agent (7) is adhered in advance to the surfaces of the separators (5A, 5B, 6), except the gas paths (10A, 10B), through photosensitive drums (31A, 31B) to which the powder is adsorbed in a given pattern. The separators (5A, 5B, 6) and the membrane-electrode assemblies (2), stacked in the guide box (40), are heated and compressed by a press (43) and heaters (40C) to obtain a unitized fuel cell stack (1).Type: ApplicationFiled: October 28, 2004Publication date: November 29, 2007Inventors: Akira Fujiki, Yukihiro Maekawa, Takeharu Kuramochi, Masahiko Katsu, Takayuki Hirao, Takeshi Shimizu, Masanori Iwamoto, Sadao Miki, Haruhiko Suzuki, Yoshiki Muto, Kaoru Eguchi, Masahiro Omata, Hiroshi Saitou
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Publication number: 20070154628Abstract: This invention relates to a manufacturing method for a polymer electrolyte fuel cell which is formed by laminating a first gas diffusion layer (6A) and a first separator (7A) on one surface of a membrane electrode assembly (9), and laminating a second gas diffusion layer (6B) and a second separator (7B) on the other surface of the membrane electrode assembly (9). An adhesive is applied to a surface of the first separator (7A) which contacts the first gas diffusion layer (6A), the adhesive is applied to a surface of the second separator (7B) which contacts the second gas diffusion layer (6B), and the first separator (7A), first gas diffusion layer (6A), membrane electrode assembly (9), second gas diffusion layer (6B), and second separator (7B) are disposed between a pair of pressing jigs (113, 123) so as to be laminated in the described sequence. An integrated fuel cell is obtained by applying heat and compression to the first separator (7A) and second separator (7B) using the pressing jigs (113, 123).Type: ApplicationFiled: December 28, 2004Publication date: July 5, 2007Applicant: NISSAN MOTOR CO., LTD.Inventors: Akira Fujiki, Yukihiro Maekawa, Takeshi Shimizu, Takayuki Hirao, Masanori Iwamoto, Sadao Miki, Haruhiko Suzuki, Hiroshi Saitou
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Publication number: 20060171838Abstract: A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.Type: ApplicationFiled: April 5, 2006Publication date: August 3, 2006Applicants: NISSAN MOTOR CO., LTD., HITACHI POWDERED METALS CO., LTD.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
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Patent number: 7041149Abstract: A sintered sprocket has a high overall density and excellent contact pressure resistance. The sprocket is produced from a sintered alloy selected from the following alloys ((1) to (3)), is densified to have a relative density of 95% or higher in the surface layer of the gear teeth by forming by rolling, having a surface hardness of 700 HV or higher, and is useful for a crankshaft, a cam shaft, a balancer shaft, or a water pump shaft of an internal combustion engine: (1) an Fe—Mo—C based sintered alloy containing Mo at 1.0 to 2.0% by mass; (2) an Fe—Mo—Ni—C based sintered alloy containing Mo at more than 1.0 and not more than 2.0% by mass, and Ni at more than 1.0 and not more than 2.5% by mass, or (3) an Fe—Mo—Ni—Cu—C based sintered alloy containing Mo at 0.3 to 1.0% by mass, Ni at not less than 1.5 to less than 3.0% by mass, and Cu at 1.0 to 2.5% by mass.Type: GrantFiled: July 7, 2004Date of Patent: May 9, 2006Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
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Publication number: 20050039575Abstract: A sintered sprocket has a high overall density and excellent contact pressure resistance. The sprocket is produced from a sintered alloy selected from the following alloys ((1) to (3)), is densified to have a relative density of 95% or higher in the surface layer of the gear teeth by forming by rolling, having a surface hardness of 700 HV or higher, and is useful for a crankshaft, a cam shaft, a balancer shaft, or a water pump shaft of an internal combustion engine: (1) an Fe—Mo—C based sintered alloy containing Mo at 1.0 to 2.0% by mass; (2) an Fe—Mo—Ni—C based sintered alloy containing Mo at more than 1.0 and not more than 2.0% by mass, and Ni at more than 1.0 and not more than 2.5% by mass, or (3) an Fe—Mo—Ni—Cu—C based sintered alloy containing Mo at 0.3 to 1.0% by mass, Ni at not less than 1.5 to less than 3.0% by mass, and Cu at 1.0 to 2.5% by mass.Type: ApplicationFiled: July 7, 2004Publication date: February 24, 2005Applicants: NISSAN MOTOR CO., LTD., HITACHI POWDERED METALS CO., LTD.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
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Publication number: 20050028641Abstract: A sintered sprocket for a silent chain is obtained from a material with few addition elements by a simple densifying method. The sintered sprocket is made of an ferrous material having an ovarall composition containing Cu at 1 to 2%, C at 0.5 to 0.8%, Mn as an inevitable impurity at 0.10% or less, and balance of Fe and other inevitable impurities by mass and has a density of 7.1 Mg/m3 or higher, 65 HRA or higher as a hardness in the gear teeth, and a martensite, sorbite, bainite, or their mixed structure as a cross-sectional microscopic structure in at least the gear teeth and the peripheral area of the gear teeth.Type: ApplicationFiled: July 6, 2004Publication date: February 10, 2005Applicants: NISSAN MOTOR CO., LTD., HITACHI POWDERED METALS CO., LTD.Inventors: Akira Fujiki, Yukihiro Maekawa, Yutaka Mabuchi, Takashi Murata, Takashi Suzuki, Jyun-ichi Yamada, Tadayuki Tsutsui, Kei Ishii
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Publication number: 20040144203Abstract: A sintered body is produced by preparing a metal powder mixture, compacting the metal powder mixture to provide a green compact and then sintering the green compact. The metal powder mixture includes a fine metal powder having a particle size of 75 &mgr;m or smaller, a graphite powder in an amount of 0.1 to 1.0% by mass and a powder lubricant in an amount of 0.05 to 0.80% by mass based on a total mass of the metal powder mixture.Type: ApplicationFiled: January 16, 2004Publication date: July 29, 2004Applicants: NISSAN MOTOR CO., LTD and, JFE STEEL CORPORATIONInventors: Shigeru Unami, Satoshi Uenosono, Yutaka Mabuchi, Akira Fujiki, Yukihiro Maekawa, Takashi Murata
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Publication number: 20030033901Abstract: A cam lobe piece of a built-up type camshaft for an internal combustion engine. The built-up type camshaft includes a hollow shaft fixedly inserted in a shaft opening of the cam lobe piece upon diametrical expansion of the hollow shaft. The cam lobe piece comprises a base circle section having the shaft opening, and a cam lobe section formed integral with the base circle section.Type: ApplicationFiled: July 2, 2002Publication date: February 20, 2003Applicant: NISSAN MOTOR CO., LTD.Inventors: Yoshimi Sugaya, Makoto Iwakiri, Takao Mitsuno, Kou Takayama, Hirokazu Fukagawa, Takayuki Hirao, Kimio Nishimura, Kouji Itakura, Mitsushi Oyanagi, Yutaka Mabuchi, Akira Fujiki, Yukihiro Maekawa, Yoshio Okada
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Patent number: 6488736Abstract: A sintered metal sprocket for a silent chain is produced by the following steps. A base mixture is prepared, which contains a powder metallurgical iron powder, a lubricant and a graphite powder. Then, the base mixture is subjected to a compression molding while being heated at above approximately 100° C. thereby to produce a green compact. Then, the green compact is subjected to a sintering at a temperature above approximately 1180° C. For much improving the mechanical performance of the sprocket thus sintered, the same may be subjected to a carbonizing hardening or an induction hardening.Type: GrantFiled: March 19, 2001Date of Patent: December 3, 2002Assignees: Nissan Motor Co., Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Katsuhiko Ueda, Makoto Iwakiri, Yoshimi Sugaya, Yutaka Mabuchi, Masato Yamaguchi, Akira Fujiki, Yukihiro Maekawa, Masakazu Wada
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Publication number: 20010038801Abstract: A sintered metal sprocket for a silent chain is produced by the following steps. A base mixture is prepared, which contains a powder metallurgical iron powder, a lubricant and a graphite powder. Then, the base mixture is subjected to a compression molding while being heated at above approximately 100° C. thereby to produce a green compact. Then, the green compact is subjected to a sintering at a temperature above approximately 1180° C. For much improving the mechanical performance of the sprocket thus sintered, the same may be subjected to a carbonizing hardening or an induction hardening.Type: ApplicationFiled: March 19, 2001Publication date: November 8, 2001Applicant: NISSAN MOTOR CO., LTD.Inventors: Katsuhiko Ueda, Makoto Iwakiri, Yoshimi Sugaya, Yutaka Mabuchi, Masato Yamaguchi, Akira Fujiki, Yukihiro Maekawa, Masakazu Wada
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Patent number: 5325692Abstract: A method of controlling a transverse shape of a strip rolled by a rolling mill having a plurality of shape correcting devices, the method including the steps of detecting a change in a strip rolling force, and a tension distribution of the rolled strip in the width direction. Based on the detected tension distribution, a strain distribution of the rolled strip is calculated, and the calculated strain distribution is used to calculate a shape parameter which represents a shape error of the rolled strip. Based on the detected change in the rolling force and the calculated shape parameter, disturbance values of the rolling mill which should be zeroed by the shape correcting devices are estimated so as to offset a delay in the detection of the tension distribution which is reflected on the shape parameter. The shape correcting devices are controlled according to the estimated disturbance values, without an influence of the delay in the detection of the tension distribution.Type: GrantFiled: September 28, 1992Date of Patent: July 5, 1994Assignee: Sumitomo Light Metal Industries, Ltd.Inventors: Ikuya Hoshino, Tatsuro Matsuura, Teiichi Abe, Atsushi Kimura, Yukihiro Maekawa
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Patent number: 4907434Abstract: The present invention relates to a method and device for controlling a thickness of a strip in a rolling mill which has a roll gap adjusting device and a rolling speed adjusting device. Rolling environment disturbances received by the mill are classified into a first disturbance for which only the rolling speed should be compensated, a second disturbance for which only the roll gap should be compensated, and a third disturbance for which both the rolling speed and the roll gap should be compensated. The values of the first, second and third disturbances are estimated, based on detected values of a variation of a roll force exerted on the given rolling stand, variations of a thickness of the strip on the downstream and upstream sides of the given rolling stand, and a variation of a tension of the strip on the upstream side of the given rolling stand.Type: GrantFiled: October 4, 1988Date of Patent: March 13, 1990Assignee: Sumitomo Light Metal Industries, Ltd.Inventors: Ikuya Hoshino, Hiroshi Kimura, Yukihiro Maekawa, Takayuki Fujimoto