Kyodo Yushi Co.

Kawasaki, Japan

Kyodo Yushi Co.

Kawasaki, Japan
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Patent
Kyodo Yushi Co. | Date: 2017-08-30

The invention provides a grease composition for rolling bearings that can exhibit improved bearing life that can secure the low noise performance under high temperature conditions, and a rolling bearing where the above-mentioned grease composition is enclosed. The grease composition for rolling bearings includes a base oil, a urea thickener and a metal deactivator. The base oil has an aniline point of 110 C or more. The urea thickener is at least one kind of diurea compound selected from the group consisting of diurea compounds represented by formula (1): R^(1)- NHCONH - R^(2)- NHCONH - R^(3) (wherein R^(1) and R^(3), which may be the same or different from each other represent a C_(6-30)alkyl group, a C_(5-8)cycloalkyl group or a C_(6-10)aryl group, and R^(2) represents a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms.)


Patent
Kyodo Yushi Co. | Date: 2017-07-05

The invention provides a grease composition used for lubricating a mechanical part having a steel portion to be lubricated which performs a rolling motion and a rolling and sliding motion, containing a base oil, a thickener and an additive, wherein the additive includes at least one compound selected from the group consisting of polyethylene wax, oxidized polyethylene wax, polypropylene wax, montan wax and amide wax.


Patent
Kyodo Yushi Co. and NTN Corporation | Date: 2017-01-18

The invention provides a grease composition for a wheel bearing, containing (a) a base oil consisting of a mineral oil and a synthetic hydrocarbon oil, wherein the ratio of the synthetic hydrocarbon oil to the total amount of the mineral oil and the synthetic hydrocarbon oil is 40 to 60 mass%, and the base oil has a kinematic viscosity at 40C of 40 to 65 mm^(2)/s; (b) a thickener of formula (A) wherein R^(2) is diphenylmethane, and R^(1) and R^(3), which may be the same or different from each other, each represent cyclohexyl group or a straight-chain or branched alkyl group having 16 to 20 carbon atoms, with a molar ratio of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed by [((the number of cyclohexyl groups) / (the number of cyclohexyl groups + the number of alkyl groups)) x 100] being 50 to 90 mol%; (c) an amine type antioxidant; and (d) an amine phosphate type antiwear agent.


Patent
Kyodo Yushi Co. and Nabtesco Corporation | Date: 2016-12-08

The invention provides a lubricant composition for an eccentrically oscillating speed reducer of planetary gear type, which is capable of extending the life of the speed. reducer under high temperatures and keeping low input torque at low temperatures, and includes (a) a base oil containing a synthetic oil, (b) a hydrocarbon wax, and (c) at least one calcium salt selected from the group consisting of a calcium salt of petroleum sulfonic acid, a calcium salt of alkyl aromatic sulfonic acid, a calcium salt of oxidized wax, an overbasic calcium salt of petroleum sulfonic acid, an overbasic calcium salt of alkyl aromatic sulfonic acid, and an overbasic calcium salt of oxidized wax.


Patent
Kyodo Yushi Co. and NTN Corporation | Date: 2015-03-12

Provided is a grease composition for a wheel bearing, containing (a) a base oil consisting of a mineral oil and a synthetic hydrocarbon oil, wherein the ratio of the synthetic hydrocarbon oil to the total amount of the mineral oil and the synthetic hydrocarbon oil is 40 to 60 mass %, and the base oil has a kinematic viscosity at 40 C. of 40 to 65 mm^(2)/s; (b) a thickener of formula (A) wherein R^(2 )is diphenylmethane, and R^(1 )and R^(3), which may be the same or different from each other, each represent cyclohexyl group or a straight-chain or branched alkyl group having 16 to 20 carbon atoms, with a molar ratio of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group being 50 to 90 mol %; (c) an amine type antioxidant; and (d) an amine phosphate type antiwear agent.


The invention provides a solid lubricant in the form of film containing a triazine compound or the salt thereof, such as melamine cyanurate or the like.


Patent
Kyodo Yushi Co. and Nidec Corporation | Date: 2016-04-28

The invention provides a lubricating oil for fluid dynamic bearing including as a base oil a monoester oil free of unsaturated bond, and having an absolute viscosity of 2.0 to 3.0 mPas at 100 C. a viscosity index of 130 or more and a pour point of 20 C. or less.


Patent
Kyodo Yushi Co. and Denso Corporation | Date: 2016-06-08

The invention provides a grease composition containing a base oil, a thickener, and an anti-flaking additive such as a compound represented by, for example, formula (1-1), which grease composition can prevent the white layer flaking of the rolling bearings. (In the formula, R1 and R4 are each independently a straight-chain or branched alkyl or alkenyl group having 1 to 20 carbon atoms.)


Patent
Kyodo Yushi Co. | Date: 2015-05-20

The invention provides a grease composition containing a urea thickener represented by formula (1):R^(1)-NHCONH-R^(2)-NHCONH-R^(3)(1)(wherein R^(2) is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and R^(1) and R^(3), which may be the same or different from each other, represent an alkyl group having 8 to 22 carbon atoms, cyclohexyl group or an aryl group having 6 to 12 carbon atoms); and a base oil containing at least one compound represented by formula (3):^(6) and R^(7), which may be the same or different from each other, represent a branched alkyl group having 10 to 26 carbon atoms, with the ratio of the number of moles of the alkyl groups represented by R^(6) and R^(7) where the carbon atom attached to the phenyl ring is a quaternary carbon atom being 40 to 95 mol% with respect to the total number of moles of the branched alkyl groups; and m and n are real numbers of 0 or more so as to satisfy the condition of 1.0m+n3.0).


The invention provides a grease composition for constant velocity joints, which contains (a) a base oil, (b) a diurea thickener, (c) benzotriazole and/or a derivative thereof, and (d) a phosphate and/or an amine salt thereof; and a constant velocity joint where the grease composition is packed.

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