EV, grease composition for HEV drive motor bearings and EV, HEV drive motor bearing

摘要

According to the present invention, a diurea thickening agent of the formula (A), The trimethylolpropane ester oils, contained more than 80% by weight relative to the total weight of the base oil, kinematic viscosity at 40 ℃ contains the base oil is a 15~50mm ² / s, EV, HEV for the drive motor shaft It will provide a grease composition. (Wherein, R ² is a .R ¹ and R ³ represents a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms are the same or different groups, or a linear or branched alkyl group having 16 to 20 carbon atoms It represents a cyclohexyl group, a linear or branched alkyl group with the number of moles of the ratio [{(the alkyl linear or branched alkyl group having 16 to 20 carbon atoms to the total number of moles of cyclohexyl group having 16 to 20 carbon atoms The number of groups) / (Number of Number + alkyl cyclohexyl group)} × 100] is 60 to 80%.) The grease composition of the present invention, a bearing lubrication life is longer at a high temperature and high speed conditions, satisfy the low temperature fluidity.