Patents by Inventor Nobutaka Hiramatsu
Nobutaka Hiramatsu 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: 7101087Abstract: A sliding member includes a substrate, a porous layer provided on the surface of the substrate and a sliding layer with which the porous layer is impregnated and coated. The sliding layer contains polybenzimidazole, 1–70 vol % of a solid lubricant and 0.1–10 vol % of hard particles.Type: GrantFiled: April 23, 2003Date of Patent: September 5, 2006Assignee: Daido Metal Company Ltd.Inventors: Nobutaka Hiramatsu, Takuya Tanaka, Hideyuki Nakajima, Masahito Fujita, Takayuki Shibayama
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Publication number: 20050249964Abstract: A multilayer sliding member is provided that contains no lead but has superior friction and abrasion properties under the conditions of high PV values and can be used suitably in dry lubrication environments. The multilayer sliding member includes: a porous metal layer that is formed on a back metal; and a sliding layer that is formed by impregnating and coating the porous metal layer, wherein the sliding layer includes 1 to 25% by volume of an oxybenzoyl polyester resin, 1 to 15% by volume of a phosphate, 1 to 20% by volume of barium sulfate, and polytetrafluoroethylene resin. The oxybenzoyl polyester resin (POB) improves the strength and abrasion resistance of the sliding material, and the synergistic effect of the phosphate and barium sulfate facilitates the transfer of PTFE to a counter material during sliding, so that the coefficient of friction can be decreased and the abrasion resistance can be improved.Type: ApplicationFiled: November 3, 2004Publication date: November 10, 2005Applicant: Daido Metal Co. Ltd.Inventors: Hideyuki Nakajima, Takahiro Niwa, Nobutaka Hiramatsu
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Patent number: 6866421Abstract: A plain bearing comprising a backing alloy made of copper alloy or aluminum alloy, a coat layer of synthetic resin formed on the surface of a backing alloy, and a thin film of polytetrafluoroethylene formed on the surface of the coat layer has a lower coefficient friction, improved conformability and distinguished sliding characteristics.Type: GrantFiled: January 27, 2003Date of Patent: March 15, 2005Assignee: Daido Metal Company Ltd.Inventors: Takuya Tanaka, Hideyuki Nakajima, Nobutaka Hiramatsu, Masahito Fujita, Takayuki Shibayama
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Patent number: 6863994Abstract: A sliding bearing includes a bearing alloy layer having a sliding surface and a resin surface layer formed on the sliding surface of the bearing alloy layer and containing polybenzimidazole and a solid lubricant. In manufacturing the sliding bearing, a resin surface layer composition is applied to a roughened surface of a bearing alloy layer. The resin surface layer composition contains polybenzimidazole and a solid lubricant. The resin surface layer composition is heated so as to be hardened to be formed into a resin surface layer.Type: GrantFiled: February 19, 2002Date of Patent: March 8, 2005Assignee: Daido Metal Company Ltd.Inventors: Takuya Tanaka, Nobutaka Hiramatsu, Takayuki Shibayama
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Patent number: 6864307Abstract: Bush 1 comprises back metal layer 2 made from a steel plate and porous sintered metal layer 4 made from copper, provided on the surface of back metal layer 2 through copper plating layer 3 and impregnated and coated with sliding material 5 within and on the surface of porous sintered metal layer 4, where sliding material 5 comprises PTFE as the main component (not less than 50 vol. % of the entire material), 3-40 vol. % of Bi particles and/or Bi alloy particles, 1-40 vol. % of injection moldable fluororesin such as PFA, etc., 0.1-20 vol. % of hard particles such a W, Al2O3, etc., and 0.1-20 vol. % of a solid lubricant such as graphite, etc. The sliding material based on PTFE as the main component is free from lead and can further improve the wear resistance, while maintaining good sliding characteristics.Type: GrantFiled: July 27, 2001Date of Patent: March 8, 2005Assignee: Daido Metal Company Ltd.Inventors: Takahiro Niwa, Hideki Iwata, Nobutaka Hiramatsu, Takayuki Shibayama
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Patent number: 6688001Abstract: There is provided a method of working a plain bearing and a working apparatus of the plain bearing, which make it easy to perform working by forming a plurality of inclined surfaces of different angles in portions on both sides of the inner peripheral surface of the bearing alloy metal of the plain bearing in the axial direction thereof. In the working method and apparatus, a working holder 18 is provided which has a groove 20 extending on the inner peripheral surface in the peripheral direction and portions on both sides of the groove in the transverse direction formed in step-like shape, a half bearing 11 is housed in the working holder 18, and both ends of the half bearing 11 in the peripheral direction are pressed by use of pressing means 24. Then, the half bearing undergoes plastic deformation so as to be fitted into the groove and both sides of the half bearing in the axial direction thereof come into abutment with the edges 22, 23 of the step-like portions and are deformed in a polygonal line form.Type: GrantFiled: March 6, 2002Date of Patent: February 10, 2004Assignee: Daido Metal Company Ltd.Inventors: Yutaka Okamoto, Satoshi Imai, Nobutaka Hiramatsu, Hideo Ishikawa, Takayuki Shibayama, Mikio Suzuki, Mitsuharu Sahashi
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Publication number: 20040008914Abstract: The present invention provides a plain bearing comprising a substrate and a sliding layer provided on the surface of the substrate which is improved in bearing performances, particularly, wear resistance. According to the present invention, the sliding layer 2 provided on the surface of the substrate 1 comprising a steal material or stainless steal contains polybenzimidazole (PBI) and 1-70 vol% of a solid lubricant. PBI is superior in heat resistance to thermosetting resins (PAI, PI, EP resins) and, besides, high in material strength, and thus wear resistance and anti-seizure property can be improved.Type: ApplicationFiled: April 21, 2003Publication date: January 15, 2004Inventors: Nobutaka Hiramatsu, Takuya Tanaka, Hideyuki Nakajima, Masahito Fujita, Takayuki Shibayama
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Publication number: 20030235355Abstract: The object of the present invention resides in providing a sliding member having a sliding layer on the sliding surface which is further improved in sliding characteristics, particularly, wear resistance and, besides, improved in bonding force of the sliding layer. In the present invention, a plating layer 1a is provided on the surface of a substrate 1 comprising stainless steel or carbon steel, and a porous layer 2 is provided by spreading metal powders of a copper alloy or the like on the surface of the plating layer 1a and sintering the metal powders. Then, the porous layer 2 is impregnated and coated with a sliding layer 3 containing PBI and 1-70 vol % of a solid lubricant.Type: ApplicationFiled: April 23, 2003Publication date: December 25, 2003Inventors: Nobutaka Hiramatsu, Takuya Tanaka, Hideyuki Nakajima, Masahito Fujita, Takayuki Shibayama
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Patent number: 6648513Abstract: There is disclosed a plain bearing comprising: a back metal; and a bearing alloy layer bonded onto the back metal which bearing alloy layer is provided at a surface side thereof with a cylindrical bearing face extended in the direction of the axis of the plain bearing, the bearing alloy face being provided at each of axial terminal portions thereof with an inclination face inclined radially outwardly from a location defined between both of axially terminal ends of said bearing face toward said axially terminal ends thereof, the inclination face having an axial length varying along the circumference of the inclination face.Type: GrantFiled: March 6, 2002Date of Patent: November 18, 2003Assignee: Daido Metal Company Ltd.Inventors: Yutaka Okamoto, Satoshi Imai, Nobutaka Hiramatsu, Hideo Ishikawa, Takayuki Shibayama, Ken Kitahara
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Publication number: 20030185474Abstract: A plain bearing comprising a backing alloy made of copper alloy or aluminum alloy, a coat layer of synthetic resin formed on the surface of a backing alloy, and a thin film of polytetrafluoroethylene formed on the surface of the coat layer has a lower coefficient friction, improved conformability and distinguished sliding characteristics.Type: ApplicationFiled: January 27, 2003Publication date: October 2, 2003Applicant: DAIDO METAL COMPANY LTDInventors: Takuya Tanaka, Hideyuki Nakajima, Nobutaka Hiramatsu, Masahito Fujita, Takayuki Shibayama
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Patent number: 6607820Abstract: Bush 4 is fabricated by providing porous sintered metal layer 7 of copper on the surface side of back metal layer 5 of steel plate through copper plating layer 6 and coating the inside and the surface of porous sintered metal layer 7 with sliding material 8 by impregnation. Sliding material 8 comprises 1-25 vol.% of tetrafluoroethylene-perfluoroalkylvinyl ether copolymer resin, 1-25 vol.% of at least one member selected from the group consisting of oxybenzoylpolyester resin and polyimide resin and 0.1-10 vol.% of hard particles having a Mohs hardness of 4 or more and average particle sizes of 5 &mgr;m or less such as Al2O3 and SiC, the balance being polytetrafluoroethylene resin (55 vol.% or more of the total siding material) as the main component. 0.5-25 vol.% of a solid lubricant such as graphite and MoS2 can be further contained in total together with the hard particles.Type: GrantFiled: June 15, 2001Date of Patent: August 19, 2003Assignee: Daido Metal Company Ltd.Inventors: Takahiro Niwa, Eiji Kato, Nobutaka Hiramatsu, Takayuki Shibayama
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Patent number: 6498127Abstract: Disclosed is a composite sliding material consisting of a back metal, a porous alloy layer which is formed on the surface of the back metal by sintering a copper alloy powder, and a resin layer which is formed so as to impregnate into and cover the porous alloy layer. The alloy layer consists of sintered copper alloy particles and has a thickness of superimposed plural particles. The copper alloy powder has an average particle size of 25 to 100 &mgr;m so that the composite sliding material has smallersliding-contact resistance.Type: GrantFiled: October 17, 2000Date of Patent: December 24, 2002Assignee: Daido Metal Company Ltd.Inventors: Takahiro Niwa, Nobutaka Hiramatsu, Takayuki Shibayama
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Publication number: 20020155304Abstract: A sliding bearing includes a bearing alloy layer having a sliding surface and a resin surface layer formed on the sliding surface of the bearing alloy layer and containing polybenzimidazole and a solid lubricant. In manufacturing the sliding bearing, a resin surface layer composition is applied to a roughened surface of a bearing alloy layer. The resin surface layer composition contains polybenzimidazole and a solid lubricant. The resin surface layer composition is heated so as to be hardened to be formed into a resin surface layer.Type: ApplicationFiled: February 19, 2002Publication date: October 24, 2002Applicant: DAIDO METAL COMPANY LTD.Inventors: Takuya Tanaka, Nobutaka Hiramatsu, Takayuki Shibayama
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Patent number: 6465089Abstract: In order to obtain a sliding material which does not include lead particles and is harmless to the environment, there is provided a sliding material which includes, by volume, 3 to 40% bismuth particles but no lead particles, while having a low coefficient of friction and excellent wear resistance.Type: GrantFiled: December 14, 2000Date of Patent: October 15, 2002Assignee: Daido Metal Company Ltd.Inventors: Takahiro Niwa, Hideki Iwata, Nobutaka Hiramatsu, Takayuki Shibayama
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Publication number: 20020124408Abstract: There is provided a method of working a plain bearing and a working apparatus of the plain bearing, which make it easy to perform working by forming a plurality of inclined surfaces of different angles in portions on both sides of the inner peripheral surface of the bearing alloy metal of the plain bearing in the axial direction thereof. In the working method and apparatus, a working holder 18 is provided which has a groove 20 extending on the inner peripheral surface in the peripheral direction and portions on both sides of the groove in the transverse direction formed in step-like shape, a half bearing 11 is housed in the working holder 18, and both ends of the half bearing 11 in the peripheral direction are pressed by use of pressing means 24. Then, the half bearing undergoes plastic deformation so as to be fitted into the groove and both sides of the half bearing in the axial direction thereof come into abutment with the edges 22, 23 of the step-like portions and are deformed in a polygonal line form.Type: ApplicationFiled: March 6, 2002Publication date: September 12, 2002Inventors: Yutaka Okamoto, Satoshi Imai, Nobutaka Hiramatsu, Hideo Ishikawa, Takayuki Shibayama, Mikio Suzuki, Mitsuharu Sahashi
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Publication number: 20020126924Abstract: There is disclosed a plain bearing comprising: a back metal; and a bearing alloy layer bonded onto the back metal which bearing alloy layer is provided at a surface side thereof with a cylindrical bearing face extended in the direction of the axis of the plain bearing, the bearing alloy face being provided at each of axial terminal portions thereof with an inclination face inclined radially outwardly from a location defined between both of axially terminal ends of said bearing face toward said axially terminal ends thereof, the inclination face having an axial length varying along the circumference of the inclination face.Type: ApplicationFiled: March 6, 2002Publication date: September 12, 2002Inventors: Yutaka Okamoto, Satoshi Imai, Nobutaka Hiramatsu, Hideo Ishikawa, Takayuki Shibayama, Ken Kitahara
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Publication number: 20020037992Abstract: Bush 1 comprises back metal layer 2 made from a steel plate and porous sintered metal layer 4 made from copper, provided on the surface of back metal layer 2 through copper plating layer 3 and impregnated and coated with sliding material 5 within and on the surface of porous sintered metal layer 4, where sliding material 5 comprises PTFE as the main component (not less than 50 vol. % of the entire material), 3-40 vol. % of Bi particles and/or Bi alloy particles, 1-40 vol. % of injection moldable fluororesin such as PFA, etc., 0.1-20 vol. % of hard particles such a W, Al2O3, etc., and 0.1-20 vol. % of a solid lubricant such as graphite, etc. The sliding material based on PTFE as the main component is free from lead and can further improve the wear resistance, while maintaining good sliding characteristics.Type: ApplicationFiled: July 27, 2001Publication date: March 28, 2002Applicant: DAIDO METAL COMPANYInventors: Takahiro Niwa, Hideki Iwata, Nobutaka Hiramatsu, Takayuki Shibayama
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Publication number: 20020015839Abstract: Bush 4 is fabricated by providing porous sintered metal layer 7 of copper on the surface side of back metal layer 5 of steel plate through copper plating layer 6 and coating the inside and the surface of porous sintered metal layer 7 with sliding material 8 by impregnation. Sliding material 8 comprises 1-25 vol. % of tetrafluoroethylene-perfluoroalkylvinyl ether copolymer resin, 1-25 vol. % of at least one member selected from the group consisting of oxybenzoylpolyester resin and polyimide resin and 0.1-10 vol. % of hard particles having a Mohs hardness of 4 or more and average particle sizes of 5 &mgr;m or less such as Al2O3 and SiC, the balance being polytetrafluoroethylene resin (55 vol. % or more of the total siding material) as the main component. 0.5-25 vol. % of a solid lubricant such as graphite and MOS2 can be further contained in total together with the hard particles.Type: ApplicationFiled: June 15, 2001Publication date: February 7, 2002Applicant: DAIDO METAL COMPANY LTDInventors: Takahiro Niwa, Eiji Kato, Nobutaka Hiramatsu
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Publication number: 20020006472Abstract: Liquid dispersion A containing a thermosetting resin and a solid lubricant is applied to the inner surface of half bearing 1 by pad printing and then cured by heating to form lubricating film layer 4 of the inner surface of half bearing 1, where liquid dispersion A is pressed onto the inner surface of half bearing 1 by pad 7, whereby the density is made higher to increase the bond strength and improve the wear resistance and the cavitation resistance.Type: ApplicationFiled: April 18, 2001Publication date: January 17, 2002Inventors: Kyoko Kazi, Takuya Tanaka, Nobutaka Hiramatsu, Takayuki Shibayama
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Patent number: 6305847Abstract: In a sliding bearing in which a bearing metal layer is covered with a coating layer, the coating layer comprises a thermosetting resin as a base resin and soft metal particles dispersed in the base resin in an amount of 0.1 to 10% by volume based on the volume of the coating layer. The soft metal is harder than the base resin and has a higher thermal conductivity than the base resin, so that the wear resistance and anti-seizure property of the sliding bearing are improved. In particular, when the soft metal particles are of copper, silver, tin, zinc or the like, the soft metal particles react with the sulfur contained in a lubricating oil to form a thin metal sulfide film excellent in lubricity on the surface of the particles, whereby the coefficient of friction is made smaller.Type: GrantFiled: December 9, 1999Date of Patent: October 23, 2001Assignee: Daido Metal Company Ltd.Inventors: Takuya Tanaka, Nobutaka Hiramatsu, Akira Ono, Koichi Yamamoto, Takayuki Shibayama