Patents by Inventor Tomohiro Motoda
Tomohiro Motoda 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: 20230083177Abstract: A roller bearing includes an outer ring, an inner ring, and plural rolling elements rollably interposed between mutual raceway surfaces of the outer and inner rings, and is used by fitting an outer diameter surface of the outer ring serving as a fitting surface to a housing serving as a mating member or by fitting an inner diameter surface of the inner ring serving as a fitting surface to a shaft serving as the mating member. The fitting surface is provided with at least one protrusion so that a static torque Thold=?(F×r) generated by the protrusion is equal to or greater than a torque Tcreep generated by creep.Type: ApplicationFiled: January 26, 2021Publication date: March 16, 2023Inventor: Tomohiro MOTODA
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Patent number: 11586787Abstract: Provided is a friction design method capable of estimating sliding friction generated between mutual sliding surfaces of two sliding members lubricated with lubricant with high precision. The friction design method sets a friction coefficient ? in a sliding surface model corresponding to mutual sliding surfaces of two sliding members (2 and 3) lubricated with lubricant (step S1), and, based on a correlation between the friction coefficient ? and an oil film parameter (?(Rk) or ?(Rk+Rpk)) calculated using a core portion level difference (Rk) or a sum of the core portion level difference (Rk) and reduced peak height (Rpk) as a parameter representing surface roughness in the sliding surface model (step S2), sets a target value for surface roughness of the sliding surfaces required to be controlled as a product (steps S3 to S6).Type: GrantFiled: December 22, 2020Date of Patent: February 21, 2023Assignee: NSK Ltd.Inventors: Yohei Murata, Tomohiro Motoda, Hideyuki Uyama
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Publication number: 20220058304Abstract: Provided is a friction design method capable of estimating sliding friction generated between mutual sliding surfaces of two sliding members lubricated with lubricant with high precision. The friction design method sets a friction coefficient ? in a sliding surface model corresponding to mutual sliding surfaces of two sliding members (2 and 3) lubricated with lubricant (step S1), and, based on a correlation between the friction coefficient ? and an oil film parameter (?(Rk) or ?(Rk+Rpk)) calculated using a core portion level difference (Rk) or a sum of the core portion level difference (Rk) and reduced peak height (Rpk) as a parameter representing surface roughness in the sliding surface model (step S2), sets a target value for surface roughness of the sliding surfaces required to be controlled as a product (steps S3 to S6).Type: ApplicationFiled: December 22, 2020Publication date: February 24, 2022Inventors: Yohei MURATA, Tomohiro MOTODA, Hideyuki UYAMA
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Patent number: 10865832Abstract: A rolling bearing has an outer diameter surface of the outer ring which is a fitting surface with a housing and the inner diameter surface of the inner ring, which is a fitting surface with a shaft. The outer diameter surface of the outer ring or the inner diameter surface of the inner ring is coated with a bonded film containing an organic binder, a solid lubricant powder such as molybdenum disulfide powder, and a friction/wear modifier such as antimony oxide powder. According to the rolling bearing, a creep resistance is kept excellent without causing increase in cost and size and being deformed and softened.Type: GrantFiled: January 6, 2020Date of Patent: December 15, 2020Assignee: NSK LTD.Inventors: Tomohiro Motoda, Hideyuki Uyama
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Publication number: 20200141447Abstract: A rolling bearing has an outer diameter surface of the outer ring which is a fitting surface with a housing and the inner diameter surface of the inner ring, which is a fitting surface with a shaft. The outer diameter surface of the outer ring or the inner diameter surface of the inner ring is coated with a bonded film containing an organic binder, a solid lubricant powder such as molybdenum disulfide powder, and a friction/wear modifier such as antimony oxide powder. According to the rolling bearing, a creep resistance is kept excellent without causing increase in cost and size and being deformed and softened.Type: ApplicationFiled: January 6, 2020Publication date: May 7, 2020Applicant: NSK LTD.Inventors: Tomohiro MOTODA, Hideyuki UYAMA
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Patent number: 10563697Abstract: A rolling bearing has an outer diameter surface of the outer ring which is a fitting surface with a housing and the inner diameter surface of the inner ring, which is a fitting surface with a shaft. The outer diameter surface of the outer ring or the inner diameter surface of the inner ring is coated with a bonded film containing an organic binder, a solid lubricant powder such as molybdenum disulfide powder, and a friction/wear modifier such as antimony oxide powder. According to the rolling bearing, a creep resistance is kept excellent without causing increase in cost and size and being deformed and softened.Type: GrantFiled: August 25, 2017Date of Patent: February 18, 2020Assignee: NSK LTD.Inventors: Tomohiro Motoda, Hideyuki Uyama
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Publication number: 20190003529Abstract: A rolling bearing has an outer diameter surface of the outer ring which is a fitting surface with a housing and the inner diameter surface of the inner ring, which is a fitting surface with a shaft. The outer diameter surface of the outer ring or the inner diameter surface of the inner ring is coated with a bonded film containing an organic binder, a solid lubricant powder such as molybdenum disulfide powder, and a friction/wear modifier such as antimony oxide powder. According to the rolling bearing, a creep resistance is kept excellent without causing increase in cost and size and being deformed and softened.Type: ApplicationFiled: August 25, 2017Publication date: January 3, 2019Applicant: NSK LTD.Inventors: Tomohiro MOTODA, Hideyuki UYAMA
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Patent number: 8454241Abstract: A rolling device in which rust development or damage on a raceway surface or rolling surface is hard to occur even if water and the like intrude is provided. A self-aligning roller bearing comprises an inner ring 1, an outer ring 2, and a plurality of rolling elements 3 disposed rotatably between a raceway surface 1a of the inner ring 1 and a raceway surface 2a of the outer ring 2. At least any one of the inner ring 1, the outer ring 2, and the rolling elements 3 is provided with a metal coating formed by shot peening of a powder of metal less noble than iron at least on a part of its surface.Type: GrantFiled: May 31, 2007Date of Patent: June 4, 2013Assignee: NSK Ltd.Inventors: Hiroyuki Uchida, Takamasa Ohira, Haruo Kamijo, Tsuyoshi Saito, Dai Kinno, Shingo Higashi, Naohiro Yoshida, Sadayuki Tanaka, Seisuke Takeda, Akitoshi Maeda, Tooru Shouda, Masateru Kondo, Kazunobu Taketa, Tomohiro Motoda
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Publication number: 20110152138Abstract: To provide a rolling bearing which is superior in preventing electrolytic corrosion, suitable for use in applications where torque reduction of the bearing is required by reducing an amount of lubricant used or by using a lubricant having a low viscosity, and has superior acoustic characteristics and durability, a rolling element according to the present invention is made of an alumina-zirconia composite material including an alumina component and either a zirconia component or a yttria-zirconia component containing 1.5 to 5 mol % of yttria, a mass ratio of the alumina component to the zirconia component or the yttria-zirconia component being 5:95 to 50:50.Type: ApplicationFiled: May 21, 2010Publication date: June 23, 2011Applicant: NSK LTD.Inventors: Tsuyoshi Nakai, Keiji Yasunaga, Tomohiro Motoda, Yuichi Endo, Mamoru Aoki, Koji Ueda, Katsunori Yanase, Satoru Watanabe, Hiroshi Ishiwada, Shun Nishizeki, Norikazu Kitagawa
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Publication number: 20100021097Abstract: A rolling device in which rust development or damage on a raceway surface or rolling surface is hard to occur even if water and the like intrude is provided. A self-aligning roller bearing comprises an inner ring 1, an outer ring 2, and a plurality of rolling elements 3 disposed rotatably between a raceway surface 1a of the inner ring 1 and a raceway surface 2a of the outer ring 2. At least any one of the inner ring 1, the outer ring 2, and the rolling elements 3 is provided with a metal coating formed by shot peening of a powder of metal less noble than iron at least on a part of its surface.Type: ApplicationFiled: May 31, 2007Publication date: January 28, 2010Applicant: NSK Ltd.Inventors: Hiroyuki Uchida, Takamasa Ohira, Haruo Kamijo, Tsuyoshi Saito, Dai Kinno, Shingo Higashi, Naohiro Yoshida, Sadayuki Tanaka, Seisuke Takeda, Akitoshi Maeda, Tooru Shouda, Masateru Kondo, Kazunobu Taketa, Tomohiro Motoda