Lubricant composition for ball joints
AssigneeShell USA, Inc.
InventorsYoshitomo Fujimaki, Hiroki Yano, Kunitoshi Abe
Life of this patent
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Abstract
The invention provides a grease composition for a ball joint which has a low friction coefficient under a load from normal temperatures to high temperatures, a small difference between static friction and dynamic friction, and little change in the friction coefficient even after repeated operation. TO this end, the invention provides a grease composition for a ball joint comprising: (i) a polyisoprene rubber and/or (ii) a polyisoprene rubber viscous material; a specific aliphatic amide and/or a specific aliphatic bisamide; and a specific urea compound.
Claims2
A grease composition for a ball joint, said composition comprising:
- (A) (i) a polyisoprene rubber and/or (ii) a polyisoprene rubber viscous material wherein the total amount of (A) is from 30 to 70 parts by mass per 100 parts by mass of the entire composition;
- (B) an aliphatic amide represented by General Formula (1)
- R1CONH2 (1)
- wherein R1 represents a saturated or unsaturated alkyl group having from 15 to 21 carbon atoms;
- and/or an aliphatic bisamide represented by General Formula (2)
- R2CONHR3NHCOR2 (2)
- wherein R2 represents a saturated or unsaturated alkyl group having from 15 to 17 carbon atoms and R3 represents a methylene group or an ethylene group wherein the total amount of (B) is from 10 to 50 parts by mass per 100 parts by mass of the entire composition;
- and
- (C) at least one compound selected from among the compounds represented by the general formulae (3), (4) and (5)
- R4NHCONHR5NHCONHR4 (3)
- R6NHCONHR5NHCONHR6 (4)
- R4NHCONHR5NHCONHR6 (5)
- wherein R5 is a diphenylmethane group, R4 is an alkyl group having 8 carbon atoms, and R6 is an unsaturated hydrocarbon group having from 14 to 20 carbon atoms, wherein the total amount of urea compound in (C) is from 1 to 15 parts by mass per 100 parts by mass of the entire composition and
- wherein the molar ratio (R6/R4) of R6 to R4 is from 0.10 to 3.00.
Dependencies are inferred from the claim text.