US 11,702,613 B2
Grease composition for ball joint
Tsuyoshi Kochi, Tokyo (JP); Mitsuhiro Kakizaki, Chigasaki (JP); Yosuke Fujiwara, Hamamatsu (JP); and Tomohiro Monna, Hamamatsu (JP)
Assigned to KYODO YUSHI CO., LTD., Fujisawa (JP)
Appl. No. 16/74,821
Filed by Kyodo Yushi Co., Ltd., Fujisawa (JP)
PCT Filed Feb. 27, 2017, PCT No. PCT/JP2017/007553
§ 371(c)(1), (2) Date Aug. 2, 2018,
PCT Pub. No. WO2017/146257, PCT Pub. Date Aug. 31, 2017.
Claims priority of application No. 2016-035946 (JP), filed on Feb. 26, 2016.
Prior Publication US 2020/0181528 A1, Jun. 11, 2020
Int. Cl. C10M 169/04 (2006.01); C10M 107/04 (2006.01); C10M 107/10 (2006.01); C10M 133/16 (2006.01); C10M 133/42 (2006.01); C10M 147/02 (2006.01); C10M 159/06 (2006.01); C10M 159/08 (2006.01); C10M 169/02 (2006.01); C10N 20/02 (2006.01)
CPC C10M 169/044 (2013.01) [C10M 107/04 (2013.01); C10M 107/10 (2013.01); C10M 133/16 (2013.01); C10M 133/42 (2013.01); C10M 147/02 (2013.01); C10M 159/06 (2013.01); C10M 159/08 (2013.01); C10M 169/02 (2013.01); C10M 2205/0225 (2013.01); C10M 2205/0285 (2013.01); C10M 2213/062 (2013.01); C10M 2215/06 (2013.01); C10M 2215/08 (2013.01); C10M 2215/102 (2013.01); C10M 2215/222 (2013.01); C10N 2020/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A grease composition for a ball joint comprising:
a base oil;
a thickener; and
an additive,
wherein the base oil is a combination of an ethylene-α-olefin copolymer having a kinetic viscosity at 40° C. of 7,000 to 15,000 mm2/s and poly-α-olefin having a kinetic viscosity at 40° C. of 19 to 50 mm2/s, the base oil has a kinetic viscosity at 40° C. of 2,200 to 5,400 mm2/5, and a content of the ethylene-α-olefin copolymer is 70% by mass or more and 90% by mass or less based on a total amount of the base oil,
the additive contains as a polar wax hydrogenated castor oil,
the thickener contains a Li soap,
a content of the base oil is 80 to 95% by mass based on a total amount of the grease composition,
a content of the thickener is 1 to 5% by mass based on the total amount of the grease composition,
a content of the polar wax is 1 to 10% by mass based on the total amount of the grease composition, and
a content of additive except for the polar wax is 18% by mass or less based on the total amount of the grease composition.