Kyodo Yushi Co., Ltd.

Honda Motor Co., Ltd.

Kao Corporation

Ntn Corporation

Jtekt Corporation

Yuta Sato

Junichi Imai

Ryosuke Saito

Iwaki Hirooka

Daisuke Tsutsui

Hiroshi Inukai

Shinji Yamane

Shinsuke Hirano

Yutaka Imai

Hiroyuki Ishikawa

Tomonobu Komoriya

Hideo Shibata

Ryuji Nakata

Morinobu Kawamura

Koji Yoshizaki

Tatsuya Miyazaki

Hirofumi Inoue

Yoichiro Sankai

Masatoshi Ijima

Yuta Kanazawa

A grease base oil, containing: condensation esters of alcohols (A) and carboxylic acids (B), wherein the alcohols (A) include a polyhydric alcohol represented by General Formula (1), the carboxylic acids (B) include a fatty acid having 5 to 9 carbon atoms (B-1), a branched fatty acid having 15 to 20 carbon atoms (B-2), a cycloalkane monocarboxylic acid having 4 to 8 carbon atoms (B-3), and an aromatic carboxylic acid (B-4), and the carboxylic acids (B) have a percentage of (B-1) above of 30 mol % to 50 mol %, a percentage of (B-2) above of 30 mol % to 50 mol %, a percentage of (B-3) above of 10 mol % to 30 mol %, and a percentage of (B-4) above of 1 mol % to 15 mol %. The grease base oil contains condensation esters having heat resistance and low temperature storageability.

Grease base oil and grease composition containing said grease base oil

A grease composition includes a base oil, a thickener, and an additive. The base oil contains a synthetic oil. The thickener contains a compound having a urea group. The additive contains a phosphoric compound, a calcium-based compound, and a hydrocarbon-based wax. A hub unit includes the grease composition enclosed therein.

Grease composition and hub unit

The present invention provides a grease composition comprising (a) a base oil, (b) a thickener comprising a urea compound, (c) an amine antioxidant at 0.5 to 5% by mass based on a total mass of the composition, and (d) a quinoline antioxidant at 0.5 to 5% by mass based on the total mass of the composition.

Grease composition

A grease composition comprises a thickener, a base oil, and a friction modifier. The friction modifier comprises: at least one selected from the group consisting of fatty acids, fatty acid metal salts, phosphate esters, thiophosphate esters, and zinc dithiophosphates; and a polyhydric alcohol ester.

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.

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&#xb0; C. of 40 to 65 mm/s; (b) a thickener of formula (A) wherein Ris diphenylmethane, and Rand R, 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. 

Grease composition and grease-filled wheel bearing

The invention provides a grease composition for hub unit bearing, having (a) as a base oil a mixture of a hydrocarbon synthetic oil and an ester type synthetic oil, with the content of the ester type synthetic oil being 20 to 50 parts by mass with respect to 100 parts by mass of the total of the hydrocarbon synthetic oil and the ester type synthetic oil, and the base oil having a kinematic viscosity at 40&#xb0; C. of 20 to 80 mm/s, and (b) as a thickener a urea compound.

Grease composition for hub unit bearing

Growing community of inventors

Fujisawa, Japan

Yuta Sato