Patents Assigned to Nippon Grease Co., Ltd.
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Patent number: 11697786Abstract: An object of the present invention is to provide a grease composition which has little influence on the environment and has good rust prevention and water resistance against salt water such as sea water. The grease composition comprises a biodegradable base oil and a rust-preventive agent comprising a calcium sulfonate complex and a sorbitan fatty acid ester, wherein a total content of biodegradable organic substances in the grease composition is 75% by mass or more, and wherein a content of the rust-preventive agent is 2.5 to 30% by mass.Type: GrantFiled: March 5, 2019Date of Patent: July 11, 2023Assignee: NIPPON GREASE CO., LTD.Inventors: Satoshi Doi, Akihiro Yamamoto, Jusei Maeda
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Publication number: 20210040413Abstract: An object of the present invention is to provide a grease composition which has little influence on the environment and has good rust prevention and water resistance against salt water such as sea water. The grease composition comprises a biodegradable base oil and a rust-preventive agent comprising a calcium sulfonate complex and a sorbitan fatty acid ester, wherein a total content of biodegradable organic substances in the grease composition is 75% by mass or more, and wherein a content of the rust-preventive agent is 2.5 to 30% by mass.Type: ApplicationFiled: March 5, 2019Publication date: February 11, 2021Applicant: NIPPON GREASE CO., LTD.Inventors: Satoshi DOI, Akihiro YAMAMOTO, Jusei MAEDA
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Patent number: 10041540Abstract: A grease composition which is excellent in seizure resistance can be provided without deteriorating resistance to stirring in the rolling device, and a rolling device in which the grease composition intervenes to a predetermined portion can be also provided by use of a grease composition comprising a base oil and a thickener, the thickener being a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, the amount of cyclohexylamine in the amine mixture being 80% by mole or more and less than 91% by mole, and a worked penetration being 300 to 330.Type: GrantFiled: March 22, 2013Date of Patent: August 7, 2018Assignees: JTEKT CORPORATION, NIPPON GREASE CO., LTD.Inventors: Koji Yoshizaki, Kensuke Suzuki, Hiroki Iwamatsu, Masashi Mitsuoka
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Patent number: 8993497Abstract: The present invention provides a grease composition which has excellent conductivity and can rapidly remove static electricity generated by using a bearing. The grease composition comprises a base oil, a thickener and a tungsten disulfide powder, wherein the average particle diameter of the tungsten disulfide powder is 0.5 to 5.0 ?m and the amount of tungsten disulfide powder based on 100 parts by mass of the total amount of base oil and thickener is 2.0 to 4.0 parts by mass.Type: GrantFiled: November 23, 2012Date of Patent: March 31, 2015Assignee: Nippon Grease Co., Ltd.Inventors: Hiroki Iwamatsu, Kenji Yuki, Masahiro Okumiya
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Patent number: 8951945Abstract: There is provided a rolling bearing which inhibits spalling of a rolling element and has a long service life even under rigorous environments. The rolling bearing comprises grease for lubricating rolling contact parts and/or sliding contact parts between a first raceway surface and a rolling elements and/or between a second raceway surface and a rolling elements, wherein the grease comprises a base oil, a thickener and an extreme pressure additive, the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole, and a reaction temperature of the extreme pressure additive with iron is 260° C. or lower.Type: GrantFiled: April 12, 2012Date of Patent: February 10, 2015Assignees: JTEKT Corporation, Nippon Grease Co., Ltd.Inventors: Koji Yoshizaki, Kunihiro Yamaguchi, Komatsugu Nishimura, Michiru Ueda, Hiroki Iwamatsu, Masashi Mitsuoka
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Patent number: 8741823Abstract: There is provided a grease composition, in which a grease film on the surface of the applied part is made thicker compared with conventional grease compositions, this thickness is maintained for a long period of time, and as a result, a longer service life against seizure compared with conventional grease compositions is assured. The grease composition comprises a base oil and a thickener, wherein the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, and an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole.Type: GrantFiled: April 12, 2012Date of Patent: June 3, 2014Assignee: Nippon Grease Co., Ltd.Inventors: Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20130137612Abstract: The present invention provides a grease composition which has excellent conductivity and can rapidly remove static electricity generated by using a bearing. The grease composition comprises a base oil, a thickener and a tungsten disulfide powder, wherein the average particle diameter of the tungsten disulfide powder is 0.5 to 5.0 ?m and the amount of tungsten disulfide powder based on 100 parts by mass of the total amount of base oil and thickener is 2.0 to 4.0 parts by mass.Type: ApplicationFiled: November 23, 2012Publication date: May 30, 2013Applicant: Nippon Grease Co., Ltd.Inventor: NIPPON GREASE Co., Ltd.
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Publication number: 20120269472Abstract: There is provided a rolling bearing which inhibits spalling of a rolling element and has a long service life even under rigorous environments. The rolling bearing comprises grease for lubricating rolling contact parts and/or sliding contact parts between a first raceway surface and a rolling elements and/or between a second raceway surface and a rolling elements, wherein the grease comprises a base oil, a thickener and an extreme pressure additive, the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole, and a reaction temperature of the extreme pressure additive with iron is 260° C. or lower.Type: ApplicationFiled: April 12, 2012Publication date: October 25, 2012Applicants: NIPPON GREASE CO., LTD., JTEKT CORPORATIONInventors: Koji YOSHIZAKI, Kunihiro Yamaguchi, Komatsugu Nishimura, Michiru Ueda, Hiroki Iwamatsu, Masashi Mitsuoka
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Publication number: 20120270762Abstract: There is provided a grease composition, in which a grease film on the surface of the applied part is made thicker compared with conventional grease compositions, this thickness is maintained for a long period of time, and as a result, a longer service life against seizure compared with conventional grease compositions is assured. The grease composition comprises a base oil and a thickener, wherein the thickener is a diurea compound obtained by allowing an amine mixture comprising alkylphenylamine, an alkyl group of which has 8 to 16 carbon atoms, and cyclohexylamine, to react with a diisocyanate compound, and an amount of cyclohexylamine in the total amount of the alkylphenylamine and cyclohexylamine is from 91 to 99% by mole.Type: ApplicationFiled: April 12, 2012Publication date: October 25, 2012Applicant: NIPPON GREASE CO., LTD.Inventors: Hiroki IWAMATSU, Masashi Mitsuoka
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Patent number: 7696139Abstract: A grease composition for a pivot assembly bearing is provided and includes a thickener of 5 to 25% by mass and a base oil of 95 to 75% by mass with respect to the total mass of the thickener and the base oil. Two or more ureas selected from: urea A: a urea comprising diurea compounds having an aliphatic (ALA)/alicyclic (ACA) substituent; urea B: a urea comprising diurea compounds having an alicyclic (ACA)/aromatic (ARA) substituent; and urea C: a urea comprising diurea compounds having an aromatic (ARA)/aliphatic (ALA) substituent are used as the thickener. A poly ?-olefin mixture having a kinematic viscosity at 40° C. of 40 to 70 mm2/s prepared by mixing poly ?-olefin (PAO HV) having a kinematic viscosity at 40° C. of 350 to 450 mm2/s with poly ?-olefin (PAO LV) having a kinematic viscosity at 40° C. of 25 to 40 mm2/s in a mass ratio of 15:85 to 30:70 is used as a base oil. A lead free additive may be used as an additive.Type: GrantFiled: September 25, 2006Date of Patent: April 13, 2010Assignees: Minebea Co., Ltd., Nippon Grease Co., Ltd.Inventors: Seiji Okamura, Motoharu Akiyama, Hiroki Iwamatsu, Yasuhiro Miyamoto
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Patent number: 7491683Abstract: Bismuth dithiocarbamate (BiDTC) is added to a urea grease containing a lubricating base oil having a poly-?-olefin synthetic oil or a diphenyl ether synthetic oil and a diurea thickening agent, or a fluorine grease containing a lubricating base oil having fluorinated synthetic oil and a polytetrafluoroethylene thickening agent. By taking such constitution as described above, a surface film is formed on a surface of a raceway of any one of inner and outer rings or a surface of a rolling element of a bearing. Therefore, the rolling bearing in which a grease composition having the constitution is packed can maintain an excellent lubricity for a long period of time even under severe conditions such as a high rotation, a high temperature and a heavy load. Further, the grease composition for the rolling bearing is low in harmfulness to a human body and gives little load to the environment.Type: GrantFiled: July 2, 2004Date of Patent: February 17, 2009Assignees: JTEKT Corporation, Nippon Grease Co., Ltd.Inventors: Hiroshi Komiya, Seiji Okamura, Hiroki Iwamatsu
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Publication number: 20050043190Abstract: Bismuth dithiocarbamate (BiDTC) is added to a urea grease containing a lubricating base oil having a poly-?-olefin synthetic oil or a diphenyl ether synthetic oil and a diurea thickening agent, or a fluorine grease containing a lubricating base oil having fluorinated synthetic oil and a polytetrafluoroethylene thickening agent. By taking such constitution as described above, a surface film is formed on a surface of a raceway of any one of inner and outer rings or a surface of a rolling element of a bearing. Therefore, the rolling bearing in which a grease composition having the constitution is packed can maintain an excellent lubricity for a long period of time even under severe conditions such as a high rotation, a high temperature and a heavy load. Further, the grease composition for the rolling bearing is low in harmfulness to a human body and gives little load to the environment.Type: ApplicationFiled: July 2, 2004Publication date: February 24, 2005Applicants: Koyo Seiko Co., Ltd., Nippon Grease Co., Ltd.Inventors: Hiroshi Komiya, Seiji Okamura, Hiroki Iwamatsu
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Patent number: 6432888Abstract: The present invention is directed to a grease for a rolling bearing containing poly-&agr;-olefin synthetic oil or diphenyl ether synthetic oil, a diurea thickening agent, and an organic antimony compound or an organic molybdenum compound. The present invention is also directed to a rolling bearing in which the grease for a rolling bearing is sealed. The organic antimony compound or the organic molybdenum compound reacts with a metal composing inner and outer bearing rings and a rolling element to form a compound film contributing to the reduction of the force in the tangential direction on a raceway surface of the bearing rings and a surface of the rolling element, thereby preventing an excessively large force in the tangential direction under high-speed rotation. This enables to lengthen the life of the rolling bearing used under particularly severe conditions such as high temperature, high-speed rotation and high road.Type: GrantFiled: June 19, 1997Date of Patent: August 13, 2002Assignees: Koyo Seiko Co., Ltd., Nippon Grease Co., Ltd.Inventors: Hiroshi Komiya, Toshikazu Kouno, Masayuki Kitamura, Toshihiro Kawaguchi, Seiji Okamura, Hiroki Iwamatsu
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Patent number: 4668411Abstract: The present invention provides a grease composition comprising a lubricating oil and a thickener, characterized in that the thickener is a diurea compound prepared by reacting a diisocyanate compound with cyclohexylamine and monoalkylphenylamine wherein the alkyl portion has 8 to 16 carbon atoms.Type: GrantFiled: December 23, 1985Date of Patent: May 26, 1987Assignees: Koyo Seiko Co., Ltd., Nippon Grease Co., Ltd.Inventors: Hiroyoshi Yasui, Teruo Yoshida, Hiroshi Komiya, Toshitaro Oguchi, Seiji Okamura