Patents by Inventor Koue Ohkawa
Koue Ohkawa 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: 8017668Abstract: The present invention provides a plain bearing having improved bearing properties, especially anti-seizure property, initial conformability and cavitation resistance. According to the present invention, a sliding layer is provided on a surface of a bearing alloy layer comprising of a copper-based or aluminum-based alloy, thereby the sliding layer is so structured that, to a polyamide-imide resin of a main constituent, a polyamide resin is added and mixed under a high shear force to form a polymer-alloyed resin binder, in which 1 to 75% by mass of a solid lubricant is dispersed. The sliding layer can have high toughness and strength, as well as improved anti-seizure property, initial conformability and cavitation resistance.Type: GrantFiled: June 16, 2008Date of Patent: September 13, 2011Assignee: Daido Metal Company Ltd.Inventors: Takuya Tanaka, Koue Ohkawa, Keiichiro Kume, Yoshimi Kuroda, Hideo Kawabata
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Publication number: 20080312357Abstract: The present invention provides a plain bearing having improved bearing properties, especially anti-seizure property, initial conformability and cavitation resistance. According to the present invention, a sliding layer is provided on a surface of a bearing alloy layer comprising of a copper-based or aluminum-based alloy, thereby the sliding layer is so structured that, to a polyamide-imide resin of a main constituent, a polyamide resin is added and mixed under a high shear force to form a polymer-alloyed resin binder, in which 1 to 75% by mass of a solid lubricant is dispersed. The sliding layer can have high toughness and strength, as well as improved anti-seizure property, initial conformability and cavitation resistance.Type: ApplicationFiled: June 16, 2008Publication date: December 18, 2008Applicant: DAIDO METAL COMPANY LTD.Inventors: Takuya TANAKA, Koue Ohkawa, Keiichiro Kume, Yoshimi Kuroda, Hideo Kawabata
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Patent number: 7431507Abstract: A sliding member has a sliding alloy layer, an intermediate layer of Ni or a Ni alloy formed on the sliding alloy layer, and a soft layer of Sn or a Sn alloy formed on the intermediate layer. A recess is formed on the sliding side surface of the sliding alloy layer. The intermediate layer is formed on the inner surface of the recess. The sliding member is subjected to a heat treatment, whereby there are formed intermetallic compounds in the soft layer, which extend protrudently from the intermediate layer.Type: GrantFiled: June 8, 2004Date of Patent: October 7, 2008Assignee: Daido Metal Company LtdInventors: Hideo Tsuji, Masahito Fujita, Naohisa Kawakami, Koue Ohkawa
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Patent number: 7153591Abstract: Disclosed is a sliding member having a bearing alloy layer, an intermediate layer of Ni or a Ni alloy formed on the bearing alloy layer, and an overlay layer of a Sn alloy containing Cu formed on the intermediate layer. There exist Sn—Cu compounds in the overlay layer, which protrudently extend from the intermediate layer. The hard Sn—Cu compounds contribute to the overlay layer in improving fatigue resistance property. A soft Sn matrix being rich in an outer surface region of the overlay layer is responsible for keeping good conformability to have excellent anti-seizure property.Type: GrantFiled: June 18, 2004Date of Patent: December 26, 2006Assignee: Daido Metal Company Ltd.Inventors: Hideo Tsuji, Masahito Fujita, Naohisa Kawakami, Koue Ohkawa
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Patent number: 7141536Abstract: A lubricant which is non-polluting and substitutable for conventional lubricants and which is excellent in lubrication characteristics, particularly having low frictional characteristics comprises an aqueous solution containing a saccharide in an amount of 0.5–30% by mass based on the total amount of the aqueous solution the saccharide comprising mainly a sucrose and a disaccharide caramel in an amount of 0.2–20% by mass based on the amount of the sucrose. As the sucrose, granulated sugar or crystal sugar is preferred, and coffee sugar containing previously a disaccharide caramel can also be used. More preferably, the lubricant contains sodium laurate and/or potassium laurate in an amount of 0.001–1% by mass. Furthermore, it is desired that the lubricant contains potassium sorbate in an amount of 0.1–3% by mass as a preservative and benzotriazole or an alkali metal salt thereof in an amount of 0.1–3% by mass as a rust inhibitor.Type: GrantFiled: October 6, 2003Date of Patent: November 28, 2006Assignee: Daido Metal Company, Ltd.Inventors: Koue Ohkawa, Katuyosi Mizojiri, Nobukatu Kimura, Takayuki Shibayama
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Publication number: 20040265618Abstract: Disclosed is a sliding member having a bearing alloy layer, an intermediate layer of Ni or a Ni alloy formed on the bearing alloy layer, and an overlay layer of a Sn alloy containing Cu formed on the intermediate layer. There exist Sn—Cu compounds in the overlay layer, which protrudently extend from the intermediate layer. The hard Sn—Cu compounds contribute to the overlay layer in improving fatigue resistance property. A soft Sn matrix being rich in an outer surface region of the overlay layer is responsible for keeping good conformability to have excellent anti-seizure property.Type: ApplicationFiled: June 18, 2004Publication date: December 30, 2004Applicant: DAIDO METAL COMPANY LTD.Inventors: Hideo Tsuji, Masahito Fujita, Naohisa Kawakami, Koue Ohkawa
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Publication number: 20040264820Abstract: A sliding member has a sliding alloy layer, an intermediate layer of Ni or a Ni alloy formed on the sliding alloy layer, and a soft layer of Sn or a Sn alloy formed on the intermediate layer. A recess is formed on the sliding side surface of the sliding alloy layer. The intermediate layer is formed on the inner surface of the recess. The sliding member is subjected to a heat treatment, whereby there are formed intermetallic compounds in the soft layer, which extend protrudently from the intermediate layer.Type: ApplicationFiled: June 8, 2004Publication date: December 30, 2004Applicant: Daido Metal Company Ltd.Inventors: Hideo Tsuji, Masahito Fujita, Naohisa Kawakami, Koue Ohkawa
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Publication number: 20040067858Abstract: The object of the present invention is to provide a lubricant which is of non-pollution and substitutable for conventional lubricants and which is excellent in lubrication characteristics, particularly low frictional characteristics. According to the present invention, the lubricant comprises an aqueous solution containing a saccharide in an amount of 0.5-30% by mass based on the total amount of the aqueous solution and the reminder of water (pure water), said saccharide comprising mainly a sucrose and a disaccharide caramel in an amount of 0.2-20% by mass based on the amount of the sucrose. As the sucrose, granulated sugar or crystal sugar is preferred, and coffee sugar containing previously a disaccharide caramel can also be used. More preferably, the lubricant contains sodium laurate and/or potassium laurate in an amount of 0.001-1% by mass. Furthermore, it is desired that the lubricant contains potassium sorbate in an amount of 0.Type: ApplicationFiled: October 6, 2003Publication date: April 8, 2004Applicant: DAIDO METAL COMPANY LTD.Inventors: Koue Ohkawa, Katuyosi Mizojiri, Nobukatu Kimura, Takayuki Shibayama
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Patent number: 6696168Abstract: A composite strip of compacted powders, which has a three layers structure, is continuously obtained by means of a rolling machine for powder compacting. The composite strip is sintered at a temperature of 460° C. to 550° C. to form a sintered composite strip. The sintered composite strip is continuously bonded by rolling to a steel strip. The bonded composite strip is optionally subjected to a heat treatment of heating at a temperature of 250° C. to 400° C. followed by heating to a temperature of 400° C. to 510° C., holding the strip under the temperature for not less than 30 seconds, and rapidly cooling down to 300° C. at a cooling rate of not lower than 50° C./minute, whereby obtaining a multi-layered composite material consisting of the steel strip, a sintered bonding layer, a sintered sliding layer and a sintered sacrificial layer.Type: GrantFiled: April 29, 2002Date of Patent: February 24, 2004Assignee: NDC Company Ltd.Inventors: Yasukuni Hasegawa, Koue Ohkawa, Hiroyuki Sugawara
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Publication number: 20030012972Abstract: A composite strip of compacted powders, which has a three layers structure, is continuously obtained by means of a rolling machine for powder compacting. The composite strip is sintered at a temperature of 460° C. to 550° C. to form a sintered composite strip. The sintered composite strip is continuously bonded by rolling to a steel strip. The bonded composite strip is optionally subjected to a heat treatment of heating at a temperature of 250° C. to 400° C. followed by heating to a temperature of 400° C. to 510° C., holding the strip under the temperature for not less than 30 seconds, and rapidly cooling down to 300° C. at a cooling rate of not lower than 50° C./minute, whereby obtaining a multi-layered composite material consisting of the steel strip, a sintered bonding layer, a sintered sliding layer and a sintered sacrificial layer.Type: ApplicationFiled: April 29, 2002Publication date: January 16, 2003Inventors: Yasukuni Hasegawa, Koue Ohkawa, Hiroyuki Sugawara
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Patent number: 4417011Abstract: A resin composition for bonding of foundry sand, said composition comprising as a resin component a crystalline unsaturated polyester being solid and substantially tack-free at room temperature and having an acid value of 15 to 100, said unsaturated polyester being prepared by polymerizing (A) a dicarboxylic acid component containing 10 to 50 mole % of terephthalic acid, an alkyl terephthalate, isophthalic acid or an alkyl isophthalate and 50 to 90 mole % of fumaric acid and (B) a glycol component containing at least 90 mole % of ethylene glycol, trimethylene glycol, neopentyl glycol, hydrogenated bisphenol A or 2,2-d-(4-hydroxypropoxyphenyl)propane.Type: GrantFiled: April 1, 1983Date of Patent: November 22, 1983Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Koue Ohkawa, Shin Fujii, Takashi Seino
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Patent number: 4396571Abstract: In preparing a resin coated sand for use in sand mold casting processes by a hot-melt process using an unsaturated polyester which is solid at room temperature as the coating material, a solution of an organic peroxide as a polymerization initiator for the unsaturated polyester is introduced into the mixture of heated foundary sand and the unsaturated polyester while the polyester is in the state of liquid coating on the sand particles, and stirring is continued to uniformly mix the solution with the unsaturated polyester and evaporate and dissipate the solvent before solidification of the polyester coating as the result of cooling of the mixture. The polyester coating contains no liquid cross-linking agent, so that the resin coated sand is untacky and high in fluidity at room temperature and, therefore, can be filled into a die cavity to shape a sand mold or core with sufficiently high bulk density.Type: GrantFiled: December 10, 1981Date of Patent: August 2, 1983Assignees: Nissan Motor Company, Ltd., Mitsui Toatsu Chemicals, Inc.Inventors: Akira Oyamada, Koue Ohkawa, Kazumi Tanaka, Isao Suyama
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Patent number: 4366269Abstract: Resin coated foundry sand, using a binder composition comprising 100 parts by weight of a crystalline unsaturated polyester and, as a cross-linking agent, 5 to 30 parts by weight of diallyl phthalate monomer. The binder is a scarcely tacky solid at room temperature but at a temperature somewhat above its softening temperature assumes a fluid state and exhibits a viscosity below about 500 poises. The resin coated sand is prepared by mixing heated foundry sand with the binder composition, with the addition of an organic peroxide which serves as a curing catalyst. Moulds and cores formed of this resin coated sand are high in initial strength but, nevertheless, can easily be disintegrated at the shake-off stage even when a relatively low pouring temperature is employed as in an aluminum alloy casting process.Type: GrantFiled: June 6, 1980Date of Patent: December 28, 1982Assignee: Nissan Motor Co., Ltd.Inventors: Koue Ohkawa, Shin Fujii, Takashi Seino
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Patent number: 4365047Abstract: A crystalline unsaturated polyester composition for binding foundry sand, said composition comprising:(A) 100 parts by weight of an unsaturated polyester resin which is a mixture of 100 parts by weight of a normally solid, substantially tack-free, crystalline unsaturated polyester and 0 to 50 parts by weight of an unsaturated prepolymer or monomer copolymerizable with said unsaturated polyester or both, and(B) 0.1 to 10 parts by weight of a mixture of at least two of (1) a radical polymerization catalyst which requires a temperature of at least 70.degree. C. but below 90.degree. C. to obtain a half-period value of 10 hours, (2) a radical polymerization catalyst which requires a temperature of at least 90.degree. C. but below 110.degree. C. to obtain a half-period value of 10 hours and (3) a radical polymerization catalyst which requires a temperature of at least 110.degree. C. but not exceeding 130.degree. C. to obtain a half-period value of 10 hours.Type: GrantFiled: May 30, 1980Date of Patent: December 21, 1982Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Koue Ohkawa, Shin Fujii, Takashi Seino
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Patent number: 4248974Abstract: A binder composition for binding foundry sand particles to form molds and cores in sand mold casting processes which may be aluminum alloy casting processes, comprising a thermosetting resin and powdery zinc carbonate which is dispersed in the resin and, while the molds and cores are heated by the poured molten metal, undergoes thermal decomposition with generation of carbon dioxide gas which aids the molds and cores to become readily disintegratable.Type: GrantFiled: June 7, 1979Date of Patent: February 3, 1981Assignee: Nissan Motor Company, LimitedInventors: Shin Fujii, Koue Ohkawa, Takashi Seino