Lubricant for controlled-slip differential

Abstract

Abstract AN IMPROVED METHOD OF LUBRICATION OF A CONTROLLED-SLIP DIFFERENTIAL COMPRISES USING A LUBRICANT COMPRISING (A) SYNTHETIC SULFURIZED OIL CONSISTING ESSENTIALLY OF A SULFURIZED BLEND OF LARD OIL AND A C12-24 MONOOLEFIN AND (B) A HYDROCARBON BASE STOCK HAVING A KINEMATIC VISCOSITY AT 210*F. IN THE RANGE OF 1.5-200.0 CS. AND CONTAINING AT BLEND OF AT LEAST ONE C13-C29 NAPHTHENE AND FORM 0.120 PARTS BY WEIGHT, BASED ON SAID NAPHTHENE OF AT LEAST ONE MEMBER FROM AT LEAST ONE OF THE FOLLOWING GROUPS (A), (B), (C) AND (D): (A) A SYNTHETIC LIQUID C3-C4 OLEFIN HOMOPOLYMER COPOLYMER, OR TERPOLYMER; (B) A MEMBER FROM GROUP (A) ABOVE WHICH IS AT LEAST PARTIALLY HYDROGENATED; (C) A SEVERLY HYDROREFINED NAPHTHENIC LUBE CONTAINING LESS THAN 1% OF GEL AROMATIC HYDROCARBONS; AND (D) A SEVERLY HYDROREFINED PARAFFINIC LUBE CONTAINING LESS THAN 1% OF GEL AROMATIC HYDROCARBONS; AND WHEREIN THE AMOUNT OF SAID BLEND WHICH IS PRESENT IN SAID BASE STOCK IS SUFFICIENT TO PROVIDE A GREATER COEFFICIENT OF TRACTION, MEASURED T 600 F./MIN., 200*F., 400,000 P.S.I., THAN WOULD BE PROVIDED BY SUBSTITUTION OF THE SAME AMOUNT OF ASTM OIL NO. 3 FOR SAID BLEND IN SAID BASE STOCK AND WHEREIN SAID LUBRICANT CONTAINS 0.5-10 VOLUMES OF SYNTHETIC SULFURIZED OIL FOR EACH 100 VOLUMES OF SAID BASE STOCK. THE PREFERRED LUBRICANT ALSO CONTINS AN EXTREME PRESSURE ADDITIVE (E.G. TRICRESYL PHOSPHATE) AND AN ADDITIVE WHICH LOWERS THE STATIC FRICTION OF THE LUBRICANT (E.G. A SURFACE-ACTIVE, ORGANIC PHOSPHATE ESTER OF A LINEAR ALIPHATIC, ETHOXYLATED ALCOHOL).

Inventors

• 👤 T Newingham
• 👤 A Recchuite
• 👤 J Griffith
• 👤 M Haseltine

Bibliographic Details