| 摘要 |
This invention is directed to lubricating oil compositions which are especially adapted for use in mechanical systems where gears are subjected to great stress and extremely high pressures such as those found in automotive rear axles or off highway transmissions and gear boxes. More particularly, the present invention relates to lubricants and functional fluids which are useful particularly in environments characterized by high pressure and rubbing surfaces and comprises a lubricating base oil having dissolved therein a combination of: (A) at least one sulfur compound characterized by the structural formula wherein R1, R2, R3 and R4 are each independently H or hydrocarbyl groups; R1 and/or R3 may be G1 or G2; R1 and R2 and/or R3 and R4 together may be alkylene groups containing about 4 to about 7 carbon atoms, G1 and G2 are each independently C(X)R, COOR, C?N, R5C=NR6, CON(R)2 or NO2, and G1 also may be CH2OH, wherein X is O or S, R5 and each R are independently H or a hydrocarbyl group, R6 is H or a hydrocarbyl group; when both G1 and G2 are R5C=NR6, the two R6 groups together may be a hydrocarbylene group linking the two nitrogen atoms; when G1 is CH2OH and G2 is COOR, a lactone may be formed by intramolecular condensation of G1 and G2; and x is an integer from 1 to about 8; (B) at least one phosphite ester characterized by the formula wherein R7 and R8 are hydrocarbyl based groups; and (C) at least one metal overbased composition. |
