Kyodo Yushi Co., Ltd.

Ntn Corporation

Nsk Corporation

Ryo Aida

Junichi Imai

Yutaka Imai

Terasu Yoshinari

Kenichi Iso

Kenichiro Matsubara

Takeshi Maejima

Hironori Mizuki

Kenta Sakaguchi

Kazunori Nakagawa

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.

Grease composition and mechanical part

The invention provides a grease composition for rolling bearings of automotive electrical equipment or automotive auxiliaries, containing a base oil that includes as an essential component an alkyldiphenyl ether oil; a diurea thickener represented by formula (1); an anti-flaking additive including an organic sulfonate rust inhibitor and a load carrying additive; and an antioxidant. In the formula (1), Ris a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and one of Ror Rrepresents cyclohexyl group and the other represents cyclohexyl group, an alkyl group having 8 to 22 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms. 

Grease composition

A grease composition for EV/HEV driving motor bearing, containing a diurea thickener of the following formula (A): 

Grease composition for EV/HEV driving motor bearing and EV/HEV driving motor bearing

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&#xb0; C. of 20 to 55 mm/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. 

Grease composition and grease-packed rolling bearing

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Suzuka, Japan

Ryo Aida