	US 12,077,721 B2
	Grease composition for speed reducer part of on-vehicle electric component
Satoshi Yamazaki, Fujisawa (JP); Yoshiyuki Nagasawa, Kameyama (JP); Daisuke Tsutsui, Yokohama (JP); Osamu Nakamura, Kiryu (JP); Hiroyuki Yoshida, Kiryu (JP); and Tsubasa Ishizeki, Kiryu (JP)
Assigned to KYODO YUSHI CO., LTD., Fujisawa (JP)
Appl. No. 17/762,140
Filed by Kyodo Yushi Co., Ltd., Fujisawa (JP)
PCT Filed Oct. 16, 2020, PCT No. PCT/JP2020/039112 § 371(c)(1), (2) Date Mar. 21, 2022, PCT Pub. No. WO2021/075553, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. 2019-189136 (JP), filed on Oct. 16, 2019.
Prior Publication US 2022/0340833 A1, Oct. 27, 2022
Int. Cl. C10M 169/02 (2006.01); C10M 101/02 (2006.01); C10M 107/02 (2006.01); C10M 111/04 (2006.01); C10M 115/08 (2006.01); C10N 20/02 (2006.01); C10N 40/00 (2006.01); C10N 50/10 (2006.01)

CPC C10M 169/02 (2013.01) [C10M 101/02 (2013.01); C10M 107/02 (2013.01); C10M 111/04 (2013.01); C10M 115/08 (2013.01); C10M 2203/1006 (2013.01); C10M 2205/0206 (2013.01); C10M 2215/1026 (2013.01); C10N 2020/02 (2013.01); C10N 2040/40 (2020.05); C10N 2050/10 (2013.01)]

7 Claims

1. A grease composition for a speed reducer part of an on-vehicle electric component, the grease composition containing a base oil and a thickener, wherein

the base oil is a mixed oil of a poly-α-olefin having a kinematic viscosity of 4 to 100 mm²/s at 100° C. and a mineral oil having a kinematic viscosity of 6 to 15 mm²/s at 100° C., the base oil has a kinematic viscosity of 8 to 15 mm²/s at 100° C. and a pour point of −30° C. or lower,

the thickener is a mixture of a diurea compound expressed by formula (1) and a diurea compound expressed by formula (2)

R₁—NHCONH—R₂—NHCONH—R₁ (1)

R₃—NHCONH—R₂—NHCONH—R₃ (2)

wherein R₁is a straight-chain alkyl group having 8 or 18 carbon atoms, R₂is a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, and R₃is an aryl group having 6 to 7 carbon atoms, the mass ratio of the diurea compound expressed by formula (1) to the diurea compound expressed by formula (2) is 9:1 to 8:2, and

a penetration of the grease composition is 220 to 280.