Kyodo Yushi Co., Ltd.

Ntn Corporation

Jtekt Corporation

Uchiyama Manufacturing Corp.

Michitaka Yoshihara

Shinichi Takabe

Mika Kohara

Yuji Onuki

Kazunori Miyake

Masanori Shibayama

Shota Akimoto

Kazuki Isa

Masayuki Murakami

Koki Ando

Hiroyuki Saito

Kanako Niiya

Kaname Nishi

Takahiro Maeda

There is provided a grease composition which is supplied between a plurality of lips provided in a sealing device that seals between a pair of members that rotate relative to each other, wherein the grease composition comprises a base oil (A), a thickening agent (B) and a rust preventive agent (C); a kinematic viscosity of the base oil (A) at 40° C. is 30 to 80 mm/s; the thickening agent (B) is a diurea compound represented by Formula (1); and the composition comprises 5 to 15% by mass of the thickening agent (B) and 0.1 to 2.0% by mass of the rust preventive agent (C) based on the total of the grease composition.R—NHCONH—R—NHCONH—R  (1) wherein Ris a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and Rand Rare a linear or branched alkyl group having 8 to 22 carbon atoms. Thus, a grease composition is provided, which can suppress a torque difference due to a rotation direction and exhibits excellent sealing properties.

Grease composition and sealing device using same

The present invention relates to a grease composition including: a base oil; a thickener; a rust inhibitor; and an extreme pressure agent, in which the rust inhibitor includes, with respect to a total mass of the grease composition: 0.10 mass % to 10.00 mass % of a calcium sulfonate; 0.20 mass % to 10.00 mass % of a zinc sulfonate; and 0.10 mass % to 10.00 mass % of a zinc carboxylate, and the extreme pressure agent includes, with respect to the total mass of the grease composition, 2.00 mass % to 14.00 mass % of a zinc dialkyldithiophosphate.

Grease composition and rolling bearing

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.

Grease composition for constant velocity joints and constant velocity joint charged with the grease composition

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Fujisawa, Japan

Michitaka Yoshihara