Base stock lubricant blends for enhanced micropitting protection
AssigneeExxonMobil Research and Engineering Company
InventorsJames T. Carey, David K. Prendergast, Angela S. Galiano-Roth
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Abstract
A lubricant formulation and method of blending a lubricant formulation is disclosed. The lubricant formulation comprises at least two base stocks. The first base stock comprises a viscosity greater than 100 cSt, Kv100° C. The second base stock comprises a viscosity less than 10 cSt, Kv100° C. The lubricant formulation provides excellent micropitting protection for gears including large gears that are used in wind turbines. In addition, the lubricant may also have a viscosity greater than 38 cSt (Kv 100° C.), a viscosity index greater than 161 and micropitting protection level of a FVA 54 micropitting Test Fail Load Stage greater than 10.
Claims22
A lubricating oil, comprising
- a) at least two base stocks;
- b) at least 10 percent and no more than 73.15 percent of a first base stock comprising a synthetic oil with a viscosity greater than 100 cSt, Kv100° C.;
- c) at least 5 percent and no more than 30 percent of a second base stock comprising a oil with a viscosity less than 10 cSt, Kv100° C.;
- d) a viscosity difference of the first and second base stocks of at least 96 cSt, Kv100° C. wherein the Lubricating oil provides a FVA 54 Micropitting Test Fail Load Stage greater than 10;
- and
- c) wherein the lubricant composition has a viscosity of greater than 39 cSt, Kv100° C. and a viscosity index of at least 161.
A method of blending a lubricating oil, comprising,
- a) obtaining a first synthetic base stock lubricant the first base stock having a viscosity greater than 100 cSt, Kv100° C.;
- b) obtaining a second synthetic base stock lubricant, the second base stock lubricant has a viscosity less than 10 cSt, Kv100° C.;
- c) mixing the first and second base stock lubricant to produce the lubricating oil wherein the lubricating oil provides a FVA 54 Micropitting Test Fail Load Stage greater than 10 and the lubricating oil having a viscosity greater than 38 cSt, Kv100° C. and a viscosity index greater than 161.
The method of achieving favorable micropitting protection comprising,
- a) obtaining a lubricating oil comprising at least two base stocks, at least 10 percent and no more than 73.15 percent of a first base stock comprising a synthetic oil with a viscosity greater than 100 cSt, Kv100° C. at least 5 percent and no more than 30 percent of a second base stock comprising an oil with a viscosity less than 10 cSt, Kv100° C., wherein the lubrication oil provides a FVA 54 Micropitting Test Fail Load Stage greater than 10, the lubricating oil having a viscosity greater than 38 cSt, Kv100° C. and a viscosity index greater than 161;
- and
- b) lubricating at least on gear with the lubricating oil.
Dependencies are inferred from the claim text.