Ntn Corporation

Hiroyuki Amari

Takayuki Kawamura

Tomoyoshi Izutsu

Masaharu Inoue

Kazuhiro Watanabe

Minoru Hasegawa

Kouhei Nakano

It is an object of the present invention to provide a grease composition, for an outer ring rotation type rolling bearing, which is capable of satisfying all of high-temperature durability, low-temperature property, peeling resistance, and rust-preventive property. A grease composition () to be enclosed in the outer rig rotation type rolling bearing for use in automotive electric auxiliary machines contains base oil, a thickener, a peeling-resistant additive, a wear-resistant additive, and a rust-preventive agent. The base oil is mixed oil of trimellitic acid ester oil and synthetic hydrocarbon oil mixed therewith in a mass ratio of (70:30) to (90:10). The thickener consists of a diurea compound shown by a formula (1).R&#x2014;NHCONH&#x2014;R&#x2014;NHCONH&#x2014;R&#x2003;&#x2003;(1)wherein a reference symbol Rdenotes a divalent aromatic hydrocarbon group having a carbon number of 6 to 15, and a reference symbol Rdenotes a cyclohexyl group.

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Chiba, Japan

Hiroyuki Amari