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US 5,750,477 AGranted
Lubricant compositions to reduce noise in a push belt continuous variable transmission
AssigneeThe Lubrizol Corporation
InventorsJames L. Sumiejski, Roy Fewkes, Craig Daniel Tipton
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Abstract
A shear stable composition for reducing noise in a push belt continuously variable transmission. The composition comprises an oil of lubricating viscosity, an overbased metal salt of an organic acid and a shear stable viscosity index improver.
Claims61
A shear stable multipurpose fluid composition for use as a lubricating or functional fluid, said composition comprising:
- A. An oil of lubricating viscosity;
- said oil having a viscosity of 1-10 centistoke (cSt) at 100.degree. C.;
- B. 1-15% by weight of a metal salt of an organic acid;
- C. 0.05-5% by weight of a metal, said metal being the metal in said metal salt;
- D. 1-25% by weight of a shear stable viscosity modifier;
- wherein said composition has a Brookfield viscosity of under 20,000 cP at -40.degree. C., and exhibits a viscosity loss of less than 20% at 100.degree. C. when measured after a 20 hour Tapered Bearing Shear Test.
3 more elements
A shear stable composition for use as a lubricant and function fluid, said composition comprising:
- A. A majority of an oil of lubricating viscosity said oil having a viscosity of 1-10 centistoke (cSt) at 100.degree. C.;
- B. 1-15% by weight of a metal salt of an organic acid;
- C. 0.5-10% by weight of a metal dialkyl dithiophosphate;
- D. 0.5-10% by weight of a sulfurized mixture of olefins, fats and fatty acids;
- E. 0.05-3% by weight of a fatty amide;
- F. 0.5-10% by weight of dialkyl phosphite;
- and
- G. 1-25% by weight of a shear stable viscosity modifier;
- wherein said composition has a Brookfield Viscosity of less than 20,000 cP at -40.degree. C. and a viscosity loss of less than 20% at 100.degree. C. where determined after a 20 hour Tapered Bearing Shear Test.
6 more elements
Dependencies are inferred from the claim text.