Patents Assigned to Kyodo Yushi Co., Ltd.
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Patent number: 9012386Abstract: The invention provides a grease composition for a hub unit bearing employing an angular contact ball bearing, containing (a) as a thickener a mixture of diurea compounds represented by formula (I): R1—NHCONH—R2—NHCONH—R1, formula (II): R1—NHCONH—R2—NHCONH—R3, and formula (III): R3—NHCONH—R2—NHCONH—R3 wherein R1 is cyclohexyl group, R2 is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, R3 is a straight-chain or branched alkyl group having 12 to 20 carbon atoms, and (R1/(R1+R3))×100=85 to 95 mol %; (b) a base oil; (c) a molybdenum dialkyldithiocarbamate; and (d) a calcium sulfonate. The grease composition of the invention, when used in the hub unit bearing, shows minimum leakage, excellent anti-flaking properties and satisfactory bearing lubrication life.Type: GrantFiled: February 28, 2011Date of Patent: April 21, 2015Assignee: Kyodo Yushi Co., Ltd.Inventors: Osamu Saita, Takashi Azuma, Masamichi Yamamoto
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Patent number: 8975218Abstract: A grease composition having a thickener, a base oil containing a hydrocarbon oil, and a polymer alloy of an olefin copolymer and a styrene-based copolymer is disclosed.Type: GrantFiled: February 3, 2012Date of Patent: March 10, 2015Assignee: Kyodo Yushi Co., Ltd.Inventors: Kyosuke Ikuma, Yosuke Takao, Takashi Takizawa, Iwaki Hirooka, Yosuke Endo, Akihiko Urashima
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Patent number: 8895489Abstract: The invention provides a grease composition for hub unit bearing, containing (a) an aromatic diurea thickener, (b) a base oil, (c) a metal salt of oxidized wax, (d) diphenyl hydrogen phosphate, and (e) at least one rust preventive selected from the group consisting of sulfonate rust preventives and carboxylic acid rust preventives. The grease composition of the invention shows excellent anti-fretting properties at low temperature, and at the same time, exhibit excellent rust preventing properties.Type: GrantFiled: September 2, 2011Date of Patent: November 25, 2014Assignees: Kyodo Yushi Co., Ltd., NTN CorporationInventors: Takashi Azuma, Yoshihisa Imamoto, Motohiro Ito, Yasushi Shibata
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Patent number: 8859475Abstract: The invention provides a grease composition for bearings used in wind power generators, containing a base oil which has a kinematic viscosity of 10 to 70 mm2/s at 40° C. and a pour point of ?40° C. or less, and a diurea compound as a thickener, for example, a diurea compound represented by formula (1) where R1 and R2 are both C8-alkyl group. The grease composition for bearings used in wind power generators according to the invention can meet the requirements in terms of the seizure life and the pumpability as well as the fatigue life (flaking life).Type: GrantFiled: October 15, 2010Date of Patent: October 14, 2014Assignee: Kyodo Yushi Co., Ltd.Inventors: Minoru Namiki, Daming Dong, Terasu Yoshinari
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Patent number: 8853140Abstract: The invention provides a grease composition comprising a base oil consisting of a fluorinated oil and an antirust agent, wherein said antirust agent comprises an aliphatic dibasic acid salt of the formula (1) in an amount of not less than 0.1% by mass and less than 1.0% by mass based on the total mass of the grease composition: (CH2)n(COO)2Mm??(1) wherein n is an integer of 1 to 19, M is an alkali or alkaline earth metal, m is 2 when M is an alkali metal and m is 1 when M is an alkaline earth metal, and a bearing wherein the grease is packed. The grease exerts less effects on the environment. It is low in evaporation loss at a high temperature, shows good antirust property and can be suitably used in a ball bearing operated at a high temperature.Type: GrantFiled: July 5, 2007Date of Patent: October 7, 2014Assignee: Kyodo Yushi Co., Ltd.Inventors: Kenichiro Matsubara, Yuji Onuki
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Publication number: 20140228135Abstract: A grease composition which provides, in the working range of 150° C. to ?40° C., an enhanced temperature control performance, a reduced low-temperature rotational torque and an improved boot resistance; and a constant velocity joint wherein the grease composition is filled; are provided. A grease composition for a constant velocity joint comprising the following components (A) to (E): (A) a base oil containing 10 to 95% by mass of an ester synthetic oil produced from an aliphatic alcohol and an aromatic carboxylic acid and 90 to 5% by mass of a synthetic hydrocarbon oil; (B) a thickener; (C) molybdenum disulfide; (D) molybdenum dialkyldithiocarbamate e; and (E) zinc dithiophosphate.Type: ApplicationFiled: April 22, 2014Publication date: August 14, 2014Applicants: KYODO YUSHI CO., LTD., NTN CorporationInventors: SHINYA KONDO, Akira Taniguchi, Ko Tanimura, Shinichi Takabe, Takaaki Shibata, Shinya Chuujou
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Publication number: 20140142012Abstract: A grease composition for EV/HEV driving motor bearing, containing a diurea thickener of the following formula (A): wherein R1, R2 and R3 are defined, with the ratio of the number of moles of the straight-chain or branched alkyl group having 16 to 20 carbon atoms to the total number of moles of the cyclohexyl group and the straight-chain or branched alkyl group having 16 to 20 carbon atoms, expressed as [((the number of alkyl group)/(the number of cyclohexyl group+the number of alkyl group))×100] being 60 to 80%, and a base oil which has a kinematic viscosity at 40° C. of 15 to 50 mm2/s and includes a trimethylolpropane ester oil in an amount of 80 mass % or more based on the total base oil mass. The grease composition can exhibit a long bearing lubrication life at high temperature and high speed, and satisfactory low-temperature flowability.Type: ApplicationFiled: July 27, 2012Publication date: May 22, 2014Applicants: KYODO YUSHI CO., LTD., NSK LTD.Inventors: Hironori Mizuki, Takeshi Maejima, Kenichi Iso, Kazunori Nakagawa, Yutaka Imai, Ryo Aida
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Patent number: 8728992Abstract: The invention provides a grease composition containing a thickener, a base oil and an antistatic agent, where the antistatic agent includes at least one selected from the group consisting of Li(CF3SO2)2N and Li(CF3SO2)3C; and a mechanical part where the above-mentioned grease composition is packed. The composition of the invention shows satisfactory results in the antistatic properties and the acoustic property.Type: GrantFiled: May 14, 2010Date of Patent: May 20, 2014Assignee: Kyodo Yushi Co. Ltd.Inventors: Masamichi Yamamoto, Yutaka Imai, Jun-ichi Imai
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Patent number: 8722598Abstract: The invention provides a grease composition having (A) a lithium soap thickener, (B) as a base oil an ester type synthetic oil obtainable from an esterification reaction of trimethylolpropane with a fatty acid, and (C) (c-1) a 1-naphthylamine type antioxidant and (c-2) a diphenylamine type antioxidant, wherein the contents of (c-1) and (c-2) are 1.0 to 10 mass % in total, based on the total mass of the composition, and the ratio by mass of (c-1) to (c-2) is in the range from 30:70 to 70:30.Type: GrantFiled: April 27, 2012Date of Patent: May 13, 2014Assignees: Kyodo Yushi Co., Ltd., Minebea Co., Ltd.Inventors: Motoharu Akiyama, Yusuke Enomoto, Kenichiro Matsubara
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Publication number: 20140128300Abstract: The invention provides a lubricating grease composition containing the following components (a) and (b): (a) an ionic liquid having as an anion bis(trifluoromethylsulfonyl)imide; and (b) as a thickener a diurea compound of formula (1): R1NH-CO-NH-R2-NH-CO-NH-R3 (1) wherein R2 is an aromatic hydrocarbon group having 6 to 15 carbon atoms; and R1 and R3, which may be the same or different are each an aromatic hydrocarbon group having 6 to 12 carbon atoms, an alicyclic hydrocarbon group having 6 to 12 carbon atoms or a straight-chain alkyl group having 8 to 20 carbon atoms, with the groups represented by R1 and R3 containing the aromatic hydrocarbon group in an amount of 50 to 100 mol %. The lubricating grease composition of the invention can favorably be used under ultra-high vacuum, and under high temperatures of 200 to 300° C.Type: ApplicationFiled: July 23, 2012Publication date: May 8, 2014Applicant: KYODO YUSHI CO., LTD.Inventors: Makoto Hayama, Setsuo Sasaki
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Publication number: 20130345101Abstract: The invention provides a grease composition for rolling bearings of automotive electrical equipment or automotive auxiliaries, where a base oil contains as an essential component an alkyldiphenyl ether oil; a thickener is a diurea compound represented by the following formula (1): (wherein R2 is a diphenylmethane group; and R1 and R3, which may be the same or different represent an aromatic hydrocarbon group having 6 to 12 carbon atoms); and an anti-flaking additive that contains an organic sulfonate rust inhibitor and a load carrying additive. The grease composition of the invention can extend the bearing lubrication life even at elevated temperatures and exhibit excellent anti-flaking properties, so that the grease composition can be enclosed in the rolling bearings of automotive electrical equipment or automotive auxiliaries.Type: ApplicationFiled: March 19, 2012Publication date: December 26, 2013Applicant: KYODO YUSHI CO,. LTDInventors: Yutaka Imai, Ryo Aida
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Publication number: 20130331306Abstract: A grease composition for a rolling bearing for a motor to support a rotor of the motor, containing a pentaerythritol ester base oil with a kinematic viscosity at 40° C. of 20 to 55 mm2/s; 7 to 13 mass % of a diurea thickener represented by formula (A) where each R group is defined; and a rust inhibitor mixture selected from the group consisting of polyol ester type rust inhibitors and organic sulfonate type rust inhibitors. The grease composition can prevent a peculiar noise from being produced at low temperatures, satisfy the low torque performance over a wide temperature range, extend the bearing lubrication life even under the circumstances of high temperature, and exhibit excellent rust inhibiting effect on varnish.Type: ApplicationFiled: March 5, 2012Publication date: December 12, 2013Applicants: NTN CORPORATION, KYODO YUSHI CO., LTD.Inventors: Ryo Aida, Yutaka Imai, Kenta Sakaguchi
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Publication number: 20130310292Abstract: The invention provides a grease composition which contains a base oil and a thickener, where the thickener is a diurea compound represented by formula (1), and the thickener is contained in an amount of 3 to 20 mass % in the grease composition: wherein R2 is diphenylmethane group; and R1 and R3, which may be the same or different represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 22 carbon atoms, with the ratio of the number of moles of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed as [((the number of the cyclohexyl group)/(the number of the cyclohexyl group+the number of the alkyl group))×100] being 70 to 80 mol %.Type: ApplicationFiled: February 22, 2012Publication date: November 21, 2013Applicant: KYODO YUSHI CO., LTD.Inventors: Masamichi Yamamoto, Yuta Sato
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Patent number: 8530396Abstract: The invention provides a grease composition for constant velocity joint containing the components (a) to (g) below and a constant velocity joint containing said composition. (a) a diurea thickening agent having the following formula (1): R1NH—CO—NH—C6H4-p-CH2—C6H4-p-NH—CO—NHR2??(1) wherein R1 and R2 may be the same or different and represent C8-C20 alkyl groups, (b) an ester synthetic oil, (c) a mineral oil and/or a synthetic hydrocarbon oil, (d) a molybdenum dialkyldithiocarbamate, (e) molybdenum disulfide, (f) a polytetrafluoroethylene, and (g) a zinc dithiophosphate compound. The grease composition of the invention reduces variations in rotational resistance of the constant velocity joint at a low temperature.Type: GrantFiled: November 20, 2012Date of Patent: September 10, 2013Assignees: Kyodo Yushi Co., Ltd., NTN CorporationInventors: Mitsuhiro Kakizaki, Shinya Kondo, Shinichi Takabe, Takaaki Shibata
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Patent number: 8518864Abstract: A grease composition for constant-velocity joints which is inexpensive and which and which has an improved anti-flaking property without using materials which have environmental burdens, and a constant-velocity joint enclosing this grease are provided. A grease composition for constant-velocity joints comprising: (a) a base oil, (b) a diurea thickener, (c) a zinc dialkyldithiophosphate, (d) a sulfurized molybdenum dialkyldithiocarbamate, (e) a zinc dialkyldithiocarbamate, and (f) a sulfur-nitrogen extreme pressure additive is provided.Type: GrantFiled: May 30, 2008Date of Patent: August 27, 2013Assignees: Kyodo Yushi Co., Ltd., NTN CorporationInventors: Daigo Nagumo, Yuji Onuki, Shinya Kondo, Shin Tomogami, Shinichi Takabe
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Patent number: 8513171Abstract: A lubricant composition, which is low in friction, does not have an attacking property against polyamide resin, etc., is excellent in heat resistance, and especially does not undergo deterioration or loss of the respective characteristics in a short term when used under a high temperature environment, is provided along with a speed reduction gear and an electric power steering apparatus that use the lubricant composition. The lubricant composition has blended therein a synthetic hydrocarbon oil, a urea thickener, zinc stearate, and a sulfur-based antioxidant. A speed reduction gear has a portion of engagement of a small gear and a large gear filled with the lubricant composition. In an electric power steering apparatus, an output of a steering assisting electric motor is speed reduced and transmitted to a steering mechanism via the speed reduction gear.Type: GrantFiled: October 14, 2009Date of Patent: August 20, 2013Assignees: JTEKT Corporation, Kyodo Yushi Co., Ltd.Inventors: Ryuji Nakata, Miwa Hokii, Mitsuhiro Kakizaki, Daisuke Tsutsui
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Publication number: 20130210688Abstract: The invention provides a lubricating grease composition with a worked penetration of 400 to 500 for a machine tool equipped with an automatic lubricator, containing a base oil having a kinematic viscosity at 40° C. of 10 to 200 mm2/s and 0.1 to 10 mass % of solid particles insoluble in the base oil. The lubricating grease composition of the invention can be fed using the automatic lubricator attached to the machine tool, and can prevent the stick-slip from occurring on the sliding lubrication portion of the machine tool.Type: ApplicationFiled: October 26, 2011Publication date: August 15, 2013Applicant: KYODO YUSHI CO., LTDInventors: Takayuki Ariyasu, Daming Dong, Hiroshi Ozeki, Minoru Namiki, Terasu Yoshinari
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Publication number: 20130157915Abstract: The invention provides a grease composition for huh unit bearing, containing (a) an aromatic diurea thickener, (b) a base oil, (c) a metal salt of oxidized wax, (d) diphenyl hydrogen phosphate, and (e) at least one rust preventive selected from the group consisting of sulfonate rust preventives and carboxylic acid rust preventives. The grease composition of the invention shows excellent anti-fretting properties at low temperature, and at the same time, exhibit excellent rust preventing properties.Type: ApplicationFiled: September 2, 2011Publication date: June 20, 2013Applicants: NTN CORPORATION, KYODO YUSHI CO., LTD.Inventors: Takashi Azuma, Yoshihisa Imamoto, Motohiro Ito, Yasushi Shibata
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LUBRICANT COMPOSITION USING IONIC LIQUID AS BASE OIL AND HAVING EXCELLENT RUST PREVENTION PROPERTIES
Publication number: 20130137615Abstract: The invention provides a lubricant composition containing (A) an ionic liquid having an anion represented by formula 1: (Rf1-SO2) (Rf2-SO2) N? or formula 2: (Rf3) (Rf3) (Rf3) PF3? wherein Rf1 and Rf2 in formula 1 may be the same or different and are each F, CF3, C2F5, C3F7 or C4F9, and Rf3 in formula 2 may be the same or different and is CF3, C2F5, C3F7 or C4F9; and (B) a fatty acid amine salt in an amount of 0.1 to 5.0 mass %, The lubricant composition of the invention can favorably be used under a high vacuum or an ultra high vacuum, or under high temperatures, and exhibits excellent rust prevention properties.Type: ApplicationFiled: August 8, 2011Publication date: May 30, 2013Applicant: KYODO YUSHI CO., LTD.Inventors: Makoto Hayama, Setsuo Sasaki -
Publication number: 20130130957Abstract: The invention provides a grease composition containing a base oil, a thickener and a rust inhibitor, characterized in that the rust inhibitor includes an organic sulfonate and a fatty acid amine salt. The grease composition of the invention exhibits excellent rust preventing characteristics and causes little damage to the environment.Type: ApplicationFiled: June 28, 2010Publication date: May 23, 2013Applicant: KYODO YUSHI CO LTDInventors: Kenichiro Matsubara, Terasu Yoshinari, Ryo Aida, Junichi Imai