Gear oil additive

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 109/02 (2006.01) C10M 107/32 (2006.01) C10M 145/22 (2006.01) C10M 159/12 (2006.01)

Patent

CA 2744455

Gear oil formulations comprising a gear oil and a film forming agent are disclosed. The film forming agent comprises a polymeric ester which is the reaction product of at least one polyfunctional alcohol, a dimer fatty acid, an optional aliphatic dicarboxylic acid having 5 to 18 carbon atoms and one or more ingredients to reduce the acid value of the polymeric ester to below 5 mgKOH/g with the resultant polymeric ester having a kinematic viscosity at 100°C ranging from 400 to 5000 mm2/s and a weight average molecular weight ranging from 5000 to 20000. When used as an automotive gear oil formulation the specifications for API GL-4 gear oils are at least satisfied. Use of the gear oil formulation in manual transmissions, transfer cases and differentials and use of the gear oil formulation in an industrial gear suitable for lubricating spur, helical, bevel, worm and hypoid gears are disclosed. Methods of lubrication are also disclosed.

Linvention concerne des formulations dhuile pour engrenages qui comprennent une huile pour engrenages et un agent filmogène. Lagent filmogène comprend un ester polymère qui est le produit de réaction dau moins un alcool polyfonctionnel, un acide gras dimère, un éventuel acide dicarboxylique aliphatique comportant 5 à 18 atomes de carbone et un ou plusieurs ingrédients destinés à réduire lindice dacidité de lester polymère en dessous de 5 mg KOH/g, lester polymère résultant ayant une viscosité cinématique à 100 °C dans la plage allant de 400 à 5 000 mm2/s et un poids moléculaire moyen en poids dans la plage allant de 5 000 à 20 000. Lors dune utilisation en tant que formulation dhuile pour engrenages automobiles, les spécifications des huiles pour engrenages API GL-4 sont au moins satisfaites. Linvention concerne également lutilisation de la formulation dhuile pour engrenages dans des transmissions manuelles, des boîtes de transfert et des différentiels, et lutilisation de la formulation dhuile pour engrenages dans un engrenage industriel, appropriée pour la lubrification dengrenages cylindriques, hélicoïdaux, coniques, à vis sans fin et hypoïdes. Linvention concerne également des procédés de lubrification.

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