Vibration resistant industrial gear oils

Abstract

The invention relates to industrial gear oil compositions that have been specially designed to be vibration resistant. That is the industrial gear oil compositions of the invention provide good performance and/or protection even when the equipment in which the composition is used is subjected to external vibration, including but not limited to vibration during transportation of the equipment. The industrial gear oil compositions include a combination of additives that provide surprisingly good protection against damage caused by vibration.

1 . An industrial gear oil composition comprising:
 (a) an oil of lubricating viscosity;   (b) a phosphorus-containing compound; and   (c) a sulfurized fatty ester.   
     
     
         2 . The industrial gear oil composition of  claim 1  wherein the oil of lubricating viscosity comprises a mineral base oil. 
     
     
         3 . The industrial gear oil composition of  claim 1  wherein the oil of lubricating viscosity comprises a synthetic base oil. 
     
     
         4 . The industrial gear oil composition of  claim 1 , wherein the phosphorus-containing compound comprises an alkyl phosphite, a phosphoric acid ester, an amine salt of a phosphoric acid ester, or some combination thereof. 
     
     
         5 . The industrial gear oil composition of  claim 1 , wherein the phosphorus-containing compound comprises alkyl phosphites or esters thereof. 
     
     
         6 . The industrial gear oil composition of  claim 1 , wherein the sulfurized fatty ester comprises a sulfurized natural oil. 
     
     
         7 . The industrial gear oil composition of  claim 1 , wherein the sulfurized fatty ester comprises a sulfurized rapeseed oil. 
     
     
         8 . The industrial gear oil composition of  claim 1 , wherein the composition further comprises (d), one or more additional additives;
 wherein component (d) comprises one or more sulfurized olefins, phosphoric acid esters, thiophosphates, thiophosphoric acid esters and/or amine salts thereof, thiadiazoles and/or substituted thiadiazole, tolyltriazoles and/or substituted triazoles, polyethers, alkenyl amines and/or polyolefin amide alkenamines, ester copolymers, carboxylic esters, dispersants, anitfoams, hydrocarbon polymers, a sulfurized fatty ester, and or any combination thereof.   
     
     
         9 . The industrial gear oil composition of  claim 1 , wherein the weight ratio of component (b) to component (c) in the industrial gear oil composition is from 1:10 to 10:1. 
     
     
         10 . The industrial gear oil composition of  claim 1 , wherein component (b) is present from 0.1 to 10 percent by weight of the overall industrial gear oil composition; and
 wherein component (c) is present from 0.1 to 20 percent by weight of the overall industrial gear oil composition.   
     
     
         11 . A process of making an industrial gear oil composition comprising the step of: (1) mixing the following components:
 (a) an oil of lubricating viscosity;   (b) a phosphorus-containing compound; and   (c) a sulfurized fatty ester;   resulting in an industrial gear oil composition.   
     
     
         12 . The process of  claim 11  wherein the oil of lubricating viscosity comprises a mineral base oil, a synthetic base oil, or a combination thereof;
 wherein the phosphorus-containing compound comprises an alkyl phosphite, a phosphoric acid ester, an amine salt of a phosphoric acid ester, or some combination thereof; 
 wherein the sulfurized fatty ester comprises a sulfurized natural oil; and 
 wherein step (1) optionally further comprises mixing (d), one or more additional additives into the industrial gear oil composition; 
 wherein component (d) comprises one or more sulfurized olefins, phosphoric acid esters, thiophosphates, thiophosphoric acid esters and/or amine salts thereof, thiadiazoles and/or substituted thiadiazole, tolyltriazoles and/or substituted triazoles, polyethers, alkenyl amines and/or polyolefin amide alkenamines, ester copolymers, carboxylic esters, dispersants, anitfoams, hydrocarbon polymers, a sulfurized fatty ester, and or any combination thereof. 
 
     
     
         13 . A method of improving the vibration resistance of an industrial gear oil composition comprising the step of: (1) adding to an industrial gear oil composition, which comprises (a) an oil of lubricating viscosity, the following components:
 (b) a phosphorus-containing compound; and   (c) a sulfurized fatty ester;   resulting in an industrial gear oil composition with improved vibration resistance.   
     
     
         14 . The method of  claim 13  wherein the oil of lubricating viscosity comprises a mineral base oil, a synthetic base oil, or a combination thereof;
 wherein the phosphorus-containing compound comprises an alkyl phosphite, a phosphoric acid ester, an amine salt of a phosphoric acid ester, or some combination thereof; 
 wherein the sulfurized fatty ester comprises a sulfurized natural oil; and 
 wherein step (1) optionally further comprises mixing (d), one or more additional additives into the industrial gear oil composition; 
 wherein component (d) comprises one or more sulfurized olefins, phosphoric acid esters, thiophosphates, thiophosphoric acid esters and/or amine salts thereof, thiadiazoles and/or substituted thiadiazole, tolyltriazoles and/or substituted triazoles, polyethers, alkenyl amines and/or polyolefin amide alkenamines, ester copolymers, carboxylic esters, dispersants, anitfoams, hydrocarbon polymers, a sulfurized fatty ester, and or any combination thereof. 
 
     
     
         15 . (canceled)