Lubricating oil composition

Abstract

A lubricant composition is disclosed which can largely reduce abrasion, can exhibit a low friction coefficient steadily, and has a high corrosion resistance in the lubrication of an iron-based sliding member. The lubricant composition includes a lubricant base oil, a 3,4,5-trihydroxybenzoic acid ester in an amount of 0.01 to 10 mass % relative to the total amount of the lubricant composition, and a detergent dispersant in an amount of 0.1 to 20 mass % relative to the total amount of the lubricant composition.

1 . A lubricating oil composition comprising a lubricating oil base oil, a 3,4,5-trihydroxybenzoic acid ester in an amount of 0.01 to 10 mass % relative to the total of the lubricating oil composition, and a detergent dispersant in an amount of 0.1 to 20 mass % relative to the total of the lubricating oil composition. 
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein the 3,4,5-trihydroxybenzoic acid ester is a 3,4,5-trihydroxybenzoic acid alkyl ester synthesized from 3,4,5-trihydroxybenzoic acid and a linear or branched alcohol having 3 to 12 carbon atoms. 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein the lubricating oil base oil has a kinematic viscosity at 40° C. of 5 to 1000 mm 2 /s. 
     
     
         4 . A lubricating oil for an internal combustion engine, a lubricating oil for a driving system, or a hydraulic oil, comprising the lubricating oil composition according to  claim 1 . 
     
     
         5 . The lubricating oil composition according to  claim 2 , wherein the lubricating oil base oil has a kinematic viscosity at 40° C. of 5 to 1000 mm 2 /s. 
     
     
         6 . A lubricating oil for an internal combustion engine, a lubricating oil for a driving system, or a hydraulic oil, comprising the lubricating oil composition according to  claim 2 . 
     
     
         7 . A lubricating oil for an internal combustion engine, a lubricating oil for a driving system, or a hydraulic oil, comprising the lubricating oil composition according to  claim 3 . 
     
     
         8 . A lubricating oil for an internal combustion engine, a lubricating oil for a driving system, or a hydraulic oil, comprising the lubricating oil composition according to  claim 5 .