Patents by Inventor Mamoru Tohyama
Mamoru Tohyama 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: 11970669Abstract: [Technical Problem] An object is to provide a lubricant capable of forming a stable adsorption film on a sliding surface and stabilizing the sliding characteristics (for example, ensuring the wear resistance, etc.). [Solution to Problem] The present invention provides a lubricant represented by the following chemical structural formula. (R: a hydrocarbon group whose carbon number is 8 to 24, m and n: integers of 2 to 8) [Selected Figure] FIG.Type: GrantFiled: January 27, 2023Date of Patent: April 30, 2024Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Mamoru Tohyama, Hiroshi Moritani, Shigeru Hotta, Norikazu Sato, Hisato Takeuchi, Yoshihiro Kikuzawa, Tomoyuki Kinjo
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Publication number: 20230365883Abstract: [Technical Problem] An object is to provide a lubricant capable of forming a stable adsorption film on a sliding surface and stabilizing the sliding characteristics (for example, ensuring the wear resistance, etc.). [Solution to Problem] The present invention provides a lubricant represented by the following chemical structural formula. [Chemical Formula 1] (R: a hydrocarbon group whose carbon number is 8 to 24, m and n: integers of 2 to 8) [Selected Figure] FIG.Type: ApplicationFiled: January 27, 2023Publication date: November 16, 2023Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Mamoru TOHYAMA, Hiroshi MORITANI, Shigeru HOTTA, Norikazu SATO, Hisato TAKEUCHI, Yoshihiro KIKUZAWA, Tomoyuki KINJO
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Patent number: 11585377Abstract: A holder has a protrusion which protrudes from a side surface at a side opposite in an axial direction with respect to a rolling element held in a pocket toward the side opposite in the axial direction. An oil supply hole which penetrates through the holder from the side surface to a surface at a side of the rolling element in the axial direction is formed in the holder. When the holder rotates, the protrusion guides oil into the oil supply hole, and the oil is introduced from the side surface of the holder to the surface on the side of the rolling element.Type: GrantFiled: March 1, 2022Date of Patent: February 21, 2023Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, JTEKT CORPORATIONInventors: Mamoru Tohyama, Yasuhiro Ohmiya, Norikazu Sato, Michiru Hirose, Takaaki Onizuka, Yoshio Tateishi, Kenichi Hasegawa, Takuya Toda, Komatsugu Nishimura, Yuya Yamamoto
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Publication number: 20220333645Abstract: A holder has a protrusion which protrudes from a side surface at a side opposite in an axial direction with respect to a rolling element held in a pocket toward the side opposite in the axial direction. An oil supply hole which penetrates through the holder from the side surface to a surface at a side of the rolling element in the axial direction is formed in the holder. When the holder rotates, the protrusion guides oil into the oil supply hole, and the oil is introduced from the side surface of the holder to the surface on the side of the rolling element.Type: ApplicationFiled: March 1, 2022Publication date: October 20, 2022Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, JTEKT CORPORATIONInventors: Mamoru Tohyama, Yasuhiro Ohmiya, Norikazu Sato, Michiru Hirose, Takaaki Onizuka, Yoshio Tateishi, Kenichi Hasegawa, Takuya Toda, Komatsugu Nishimura, Yuya Yamamoto
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Patent number: 10851776Abstract: A sliding member has a sliding surface sliding under a wet condition in which a lubricant oil exists. The sliding surface is coated with a laminate film comprising an upper layer and a lower layer. The lower layer comprises hydrogen-free amorphous carbon (hydrogen-free DLC) and carbon particles dispersed on or in the hydrogen-free DLC. The hydrogen-free DLC has a hydrogen content of 5 atom % or less when the lower layer as a whole is 100 atom %. The upper layer comprises boron-containing amorphous carbon (B-DLC) and has protrusions on a surface side of the upper layer along the carbon particles of the lower layer. The B-DLC has a boron content of 1-40 atom % when the upper layer as a whole is 100 atom %. The protrusions have a particle diameter of 0.5-5 ?m and exist with a density of 20 protrusions/100 ?m2 or more.Type: GrantFiled: January 3, 2019Date of Patent: December 1, 2020Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, JTEKT CORPORATIONInventors: Masaru Okuyama, Hiroyuki Mori, Mamoru Tohyama, Noriyuki Emoto, Naohito Yoshida
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Patent number: 10487284Abstract: A sliding system includes a pair of sliding members having sliding surfaces that can relatively move while facing each other and a lubricant oil interposed between the sliding surfaces facing each other. At least one of the sliding surfaces includes a coating surface of a crystalline Cr plating film. The lubricant oil contains an oil-soluble molybdenum compound comprising a trinuclear Mo structure. In particular, considerably low friction properties can be developed by a combination of the Cr plating film, in which at least one of three types of peak area intensity ratios (P1 to P3) as obtained by X-ray diffraction falls within a predetermined range (P1?0.015, P2?0.02, P3?0.03), and the lubrication oil which contains the trinuclear Mo structure.Type: GrantFiled: January 26, 2018Date of Patent: November 26, 2019Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Shigeru Hotta, Hiroyuki Mori, Mamoru Tohyama, Toshihide Ohmori
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Publication number: 20190323498Abstract: A sliding member has a sliding surface sliding under a wet condition in which a lubricant oil exists. The sliding surface is coated with a laminate film comprising an upper layer and a lower layer. The lower layer comprises hydrogen-free amorphous carbon (hydrogen-free DLC) and carbon particles dispersed on or in the hydrogen-free DLC. The hydrogen-free DLC has a hydrogen content of 5 atom % or less when the lower layer as a whole is 100 atom %. The upper layer comprises boron-containing amorphous carbon (B-DLC) and has protrusions on a surface side of the upper layer along the carbon particles of the lower layer. The B-DLC has a boron content of 1-40 atom % when the upper layer as a whole is 100 atom %. The protrusions have a particle diameter of 0.5-5 ?m and exist with a density of 20 protrusions/100 ?m2 or more.Type: ApplicationFiled: January 3, 2019Publication date: October 24, 2019Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, JTEKT CORPORATIONInventors: Masaru OKUYAMA, Hiroyuki MORI, Mamoru TOHYAMA, Noriyuki EMOTO, Naohito YOSHIDA
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Patent number: 10450527Abstract: A method including substituting an atmosphere in a space, in which a sliding surface formed of a metal or a ceramic material, and a slid surface are disposed, with a gas atmosphere containing a hydroxyl group-containing compound and at least one of hydrogen and nitrogen, and relatively sliding the sliding surface against the slid surface by a Hertzian contact stress of 1.0 GPa or more in the space under the gas atmosphere containing the hydroxyl group-containing compound at least one of hydrogen and nitrogen. As a result, it is possible to form, on the sliding surface, a low-friction coating that stably exhibits a significantly low friction coefficient, for example, of 10?4 order (less than 0.001).Type: GrantFiled: January 29, 2016Date of Patent: October 22, 2019Assignees: JTEKT CORPORATION, THE UNIVERSITY OF TOKYOInventors: Takahisa Kato, Masataka Nosaka, Mamoru Tohyama, Masahiro Suzuki
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Patent number: 10414996Abstract: A method including substituting an atmosphere in a space, in which a sliding surface formed of a metal or a ceramic material, and a slid surface are disposed, with a gas atmosphere containing a hydroxyl group-containing compound and at least one of hydrogen and nitrogen, and relatively sliding the sliding surface against the slid surface by a Hertzian contact stress of 1.0 GPa or more in the space under the gas atmosphere containing the hydroxyl group-containing compound at least one of hydrogen and nitrogen. As a result, it is possible to form, on the sliding surface, a low-friction coating that stably exhibits a significantly low friction coefficient, for example, of 10?4 order (less than 0.001).Type: GrantFiled: January 29, 2016Date of Patent: September 17, 2019Assignees: JTEKT CORPORATION, THE UNIVERSITY OF TOKYOInventors: Takahisa Kato, Masataka Nosaka, Mamoru Tohyama, Masahiro Suzuki
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Patent number: 10369498Abstract: An oil deterioration suppressing apparatus is provided. The apparatus may include a filtering portion including a filter element for filtering oil, and a deterioration suppressing portion including a powdery deterioration retarder which suppresses deterioration of oil. The deterioration suppressing portion may include a flow passage wall which holds the powdery deterioration retarder and defines an oil flow passage, and the powdery deterioration retarder includes mesoporous inorganic material.Type: GrantFiled: April 18, 2013Date of Patent: August 6, 2019Assignee: TOYOTA BOSHOKU KABUSHIKI KAISHAInventors: Hideto Morishita, Yasuhiro Saito, Ippei Fukutomi, Motoichi Murakami, Katsuichi Miyasaka, Yasuhiro Ohmiya, Hiroshi Moritani, Mamoru Tohyama, Narihito Tatsuda
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Patent number: 10329509Abstract: A low-friction coating includes: an aliphatic hydrocarbon group showing a peak in a region of 2,900 cm?1 to 3000 cm?1 in an infrared absorption spectrum; a carbonyl group showing a peak in a region of 1,650 cm?1 to 1,800 cm?1 in an infrared absorption spectrum; an aromatic component (C7H7+) showing a peak at mass 91.1 in a positive ion spectrum obtained by TOF-SIMS; and a condensed ring based component (C9H7+) showing a peak at mass 115.2 in the positive ion spectrum obtained by TOF-SIMS.Type: GrantFiled: January 29, 2016Date of Patent: June 25, 2019Assignees: JTEKT CORPORATION, THE UNIVERSITY OF TOKYOInventors: Takahisa Kato, Masataka Nosaka, Mamoru Tohyama, Atsushi Murase, Kyoko Nakai, Masahiro Suzuki
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Publication number: 20190177637Abstract: [Technical Problem] An object is to provide a sliding system that allows the friction coefficient at a sliding part to be considerably reduced by means of a novel combination of a chromium nitride film and a lubricant oil. [Solution to Problem] The sliding system of the present invention comprises: a pair of sliding members having sliding surfaces that can relatively move while facing each other; and a lubricant oil that can be interposed between the sliding surfaces facing each other. At least one of the sliding surfaces comprises a coating surface of a specific chromium nitride film, and the lubricant oil contains an oil-soluble molybdenum compound comprising molybdenum dialkyldithiophosphate (Mo-DTP). When the chromium nitride film as a whole is 100 at % (referred simply to as “%”), the chromium nitride film comprises 40-65% of Cr and 35-55% of N and has a relative surface area of 15-85%.Type: ApplicationFiled: November 12, 2018Publication date: June 13, 2019Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki MORI, Shigeru HOTTA, Mamoru TOHYAMA, Masaru OKUYAMA, Keiji HAYASHI, Kazuyoshi MANABE
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Patent number: 10301568Abstract: [Technical Problem] An object is to provide a sliding system which can achieve both the reduced friction and the enhanced wear resistance by means of a novel combination of a sliding film and a lubricant oil. [Solution to Problem] The sliding system of the present invention comprises: a pair of sliding members having sliding surfaces that can relatively move while facing each other; and a lubricant oil interposed between the sliding surfaces facing each other. At least one of the sliding surfaces comprises a coating surface of a crystalline chromium carbide film. The lubricant oil contains an oil-soluble molybdenum compound that has a chemical structure of a trinuclear of Mo. When the chromium carbide film as a whole is 100 at %, the chromium carbide film contains 40-75 at % of Cr.Type: GrantFiled: January 27, 2017Date of Patent: May 28, 2019Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki Mori, Mamoru Tohyama, Masaru Okuyama, Keiji Hayashi, Naoya Ikeda
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Publication number: 20190100714Abstract: A sliding system includes a pair of sliding members having opposing sliding surfaces adapted to move relative to each other, and a lubricating oil interposed between the opposing sliding surfaces. Here, at least one of the sliding surfaces is a covered surface covered with a specific chromium nitride film. The lubricating oil contains an oil-soluble molybdenum compound formed of a molybdenum dialkyldithiocarbamate. In the chromium nitride film, when an amount of atoms constituting the entire chromium nitride film is set as 100 atom %, there is 32 atom % to 47 atom % of N, the balance is Cr, and a relative area which is an area ratio of the (111) plane with respect to the (200) plane obtained when the chromium nitride film is analyzed by X-ray diffraction is 20% to 30%.Type: ApplicationFiled: October 2, 2018Publication date: April 4, 2019Inventors: Shigeru HOTTA, Hiroyuki MORI, Mamoru TOHYAMA, Masaru OKUYAMA, Keiji HAYASHI, Kazuyoshi MANABE
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Patent number: 10202560Abstract: A low-friction coating includes: an aliphatic hydrocarbon group showing a peak in a region of 2,900 cm?1 to 3000 cm?1 in an infrared absorption spectrum; a carbonyl group showing a peak in a region of 1,650 cm?1 to 1,800 cm?1 in an infrared absorption spectrum; an aromatic component (C7H7+) showing a peak at mass 91.1 in a positive ion spectrum obtained by TOF-SIMS; and a condensed ring based component (C9H7+) showing a peak at mass 115.2 in the positive ion spectrum obtained by TOF-SIMS.Type: GrantFiled: January 29, 2016Date of Patent: February 12, 2019Assignees: JTEKT CORPORATION, THE UNIVERSITY OF TOKYOInventors: Takahisa Kato, Masataka Nosaka, Mamoru Tohyama, Atsushi Murase, Kyoko Nakai, Masahiro Suzuki
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Publication number: 20180282652Abstract: [Technical Problem] An object is to provide a sliding system that can considerably reduce the friction by means of a novel combination of a sliding film and a lubricant oil. [Solution to Problem] The sliding system of the present invention comprises a pair of sliding members having sliding surfaces that can relatively move while facing each other and a lubricant oil interposed between the sliding surfaces facing each other. At least one of the sliding surfaces comprises a coating surface of a crystalline Cr plating film. The lubricant oil contains an oil-soluble molybdenum compound that has a chemical structure of a Mo-trinuclear. In particular, considerably low friction properties can be developed by a combination of the Cr plating film, in which at least one of three types of peak area intensity ratios (P1 to P3) as obtained by X-ray diffraction falls within a predetermined range (P1?0.015, P2?0.02, P3?0.03), and the lubrication oil which contains the Mo-trinuclear.Type: ApplicationFiled: January 26, 2018Publication date: October 4, 2018Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Shigeru HOTTA, Hiroyuki MORI, Mamoru TOHYAMA, Toshihide OHMORI
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Patent number: 10030207Abstract: A sliding machine includes: a pair of sliding members having sliding surfaces that oppose each other and are able to move relative to each other; and a lubricating oil which is able to be interposed between the opposed sliding surfaces, in which at least one of the sliding surfaces is covered with a chromium (Cr)-containing amorphous carbon film (chromium-coating DLC), and the lubricating oil contains an oil-soluble molybdenum compound having a chemical structure formed from a trinuclear material of molybdenum (Mo). Specifically, the chromium-coating DLC contains, when the entirety of the film is assumed to be 100 at. %, 1% to 49% of Cr, 0% to 30% of hydrogen (H), carbon (C) as a remainder, and impurities. The lubricating oil contains 5 ppm to 800 ppm of the oil-soluble molybdenum compound in terms of Mo mass ratio with respect to the entirety of the lubricating oil.Type: GrantFiled: July 9, 2015Date of Patent: July 24, 2018Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Hiroyuki Mori, Mamoru Tohyama, Masaru Okuyama, Keiji Hayashi, Naoya Ikeda
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Publication number: 20180023016Abstract: A low-friction coating includes: an aliphatic hydrocarbon group showing a peak in a region of 2,900 cm?1 to 3000 cm?1 in an infrared absorption spectrum; a carbonyl group showing a peak in a region of 1,650 cm?1 to 1,800 cm?1 in an infrared absorption spectrum; an aromatic component (C7H7+) showing a peak at mass 91.1 in a positive ion spectrum obtained by TOF-SIMS; and a condensed ring based component (C9H7+) showing a peak at mass 115.2 in the positive ion spectrum obtained by TOF-SIMS.Type: ApplicationFiled: January 29, 2016Publication date: January 25, 2018Applicants: JTEKT CORPORATION, THE UNIVERSITY OF TOKYOInventors: Takahisa KATO, Masataka NOSAKA, Mamoru TOHYAMA, Atsushi MURASE, Kyoko NAKAI, Masahiro SUZUKI
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Publication number: 20170362711Abstract: A sliding surface, which is formed using metal (SUJ2, palladium etc.) or oxide ceramics (ZrO2), is made to slide, at a Hertzian contact stress of 1.0 GPa or more in an atmospheric environment containing a hydrogen gas including a minute amount of an alcohol and water, against a slid surface including a PLC film which is a coating formed by an ionization deposition method while applying a low bias voltage. Consequently, it is possible to form, on the sliding surface, a low-friction coating that stably exhibits a significantly low friction coefficient of 10?4 order (less than 0.001).Type: ApplicationFiled: January 29, 2016Publication date: December 21, 2017Applicants: JTEKT CORPORATION, THE UNIVERSITY OF TOKYOInventors: Takahisa KATO, Masataka NOSAKA, Mamoru TOHYAMA, Masahiro SUZUKI
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Patent number: 9790447Abstract: [Technical Problem] An object is to provide a sliding system which can drastically reduce the friction coefficient on a sliding portion by means of a novel combination of a chromium nitride film and a lubricant oil. [Solution to Problem] The sliding system according to the present invention includes: a pair of sliding members having sliding surfaces that can relatively move while facing each other; and a lubricant oil that can be interposed between the sliding surfaces facing each other. At least one of the sliding surfaces is formed as a coating surface of a chromium nitride film, and the lubricant oil contains an oil-soluble molybdenum compound that has a chemical structure of a trinuclear of Mo.Type: GrantFiled: July 10, 2015Date of Patent: October 17, 2017Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hiroyuki Mori, Mamoru Tohyama, Masaru Okuyama, Keiji Hayashi, Naoya Ikeda