Driveline and transmission fluids for low speed wear and scuffing
AssigneeAfton Chemical Corporation
InventorsBryan Rock, Carey Lehner, Carmen Betts
Life of this patent
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Abstract
This disclosure relates to lubricants with certain amounts of calcium and zinc that tend to perform well in the low-speed FZG scuffing tests of CEC L-07 (FZG A/8.3/90) and further include certain amounts of low molecular weight diol and/or triol compounds to achieve good gear wear performance in FZG wear tests. The lubricants herein are suitable for use as industrial gear oils for transmission fluids (i.e., manual, automatic, or dual-clutch transmissions), gear fluids, axle fluids, differential fluids, and/or lubricating fluids for other gear-type applications configured for heavy-duty applications.
Claims20
An off-road lubricant composition comprising:
- one or more base oils of lubricating viscosity;
- about 600 ppm to about 1,500 ppm of zinc provided by a zinc dialkyl dithiophosphate compound;
- one or more metal-containing detergents providing about 2,750 ppm to about 4,000 ppm of metal selected from calcium, magnesium and/or sodium and provided from one or more C6 to C30 branched metal salts of phenates, sulfonates, calixarates, salixarates, salicylates, carboxylic acids, or combinations thereof;
- no more than about 300 ppm of nitrogen provided from one or more nitrogen-containing ashless dispersants;
- about 0.01 to about 2.0 weight percent of a non-esterified C2 to C3 diol or triol compound or mixture thereof, wherein the non-esterified C2 to C3 diol or triol compound is trihydroxypropane;
- and
- wherein the off-road lubricant composition has less than 0.1 weight percent of glycerol monooleate.
A method for providing low speed wear and scuffing protection to gears, bearings, and/or clutches according to Caterpillar TO-4 requirements as measured pursuant to ASTM D4998 and CEC L-07 (FZG A/8.3/90), the method comprising:
- lubricating the gears, bearings, and/or clutches with a lubricating composition;
- wherein the lubricating composition includes
- one or more base oils of lubricating viscosity;
- about 600 ppm to about 1,500 ppm of zinc provided by a zinc dialkyl dithiophosphate compound;
- one or more metal-containing detergents providing about 2750 ppm to about 4000 ppm of metal selected from calcium, magnesium and/or sodium and provided from one or more C6 to C30 branched metal salts of phenates, sulfonates, calixarates, salixarates, salicylates, carboxylic acids, or combinations thereof;
- no more than about 300 ppm of nitrogen provided from one or more nitrogen-containing ashless dispersants;
- about 0.01 to about 2.0 weight percent of a non-esterified C2 to C3 diol or triol compound or mixture thereof, and wherein the non-esterified C2 to C3 diol or triol compound is trihydroxypropane;
- and
- wherein the lubricating composition has less than 0.1 weight percent of glycerol monooleate.
Dependencies are inferred from the claim text.