Ntn Corporation

Seiichi Nozaki

Takahiro Koremoto

Yosiki Yamaguchi

Kazuhiro Matsumoto

Grease for fan bearing

According to the present invention, PAO oil and ester oil are mixed in a ratio by weight of from 50:50 to 90:10 to provide a base oil having a viscosity of not more than 70 mm,/S at 40&deg; C., to which base oil is then added 5-25% by weight of diurea, which is an alicyclic compound, serving as a thickener, and ZnDTC, which is an additive. The grease thus prepared is filled in a bearing,. This bearing,is fitted in the inner portion of a pulley body,having a pulley peripheral surface is to be contacted by a belt driven by the engine of an automobile. Thereby, brittle peeling occurring in the raceway surfaces and ball surfaces, and abnormal noise under cold ambient can be reliably prevented.

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Okayama-ken, Japan

Seiichi Nozaki