公开(公告)号：US20180079988A1

公开(公告)日：2018-03-22

申请号：US15559413

申请日：2016-03-09

Applicant: NTN CORPORATION

Inventor： Masaharu INOUE ,  Kazuhiro WATANABE ,  Tomoyoshi IZUTSU ,  Takayuki KAWAMURA ,  Hiroyuki AMARI ,  Minoru HASEGAWA ,  Kouhei NAKANO

IPC: C10M169/00 ,  C10M105/36 ,  C10M101/00 ,  C10M111/02 ,  C10M115/08 ,  C10M125/10 ,  C10M139/00 ,  C10M141/12

Abstract: 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 (7) 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). R1—NHCONH—R2—NHCONH—R1  (1) wherein a reference symbol R2 denotes a divalent aromatic hydrocarbon group having a carbon number of 6 to 15, and a reference symbol R1 denotes a cyclohexyl group.