Improved fuel economy additive and lubricant composition...

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 129/76 (2006.01) C10M 129/74 (2006.01)

Patent

CA 2286898

A lubricant composition capable of improving the fuel economy of an internal combustion engine and comprising a base oil as a major component and from about 2 to about 15 wt.%, based on the weight of composition, of a fuel economy improving additive having a viscosity greater than the viscosity of the bulk lubricant and being selected such that the lubricant is characterized by (1) a positive deviation form that of a theoretical line when the elastohydrodynamic (EHD) film thickness thereof is plotted against entrainment speed on a log basis, and by (2) a traction coefficient under both hydrodynamic and mixed lubrication conditions which is lower than it would have been if the fuel economy improving additive were not present in the lubricant is disclosed.

La présente invention concerne uen composition de lubrifiant permettant d'améliorer l'économie de carburant dans un moteur à combustion interne et comprenant une huile de base comme composant principal et environ 2 % à environ 15 % en poids, ramené au poids de la composition, d'un additif améliorant l'économie de carburant présentant une viscosité supérieure à la viscosité de la masse du lubrifiant. Ledit additif amélioré d'économie de carburant est sélectionné de sorte que le lubrifiant est caractérisé par (1) une déviation positive par rapport à celle d'une ligne théorique lorsque l'épaisseur de la couche mince élastohydrodynamique (EHD) est représentée sur un graphique par rapport à la vitesse d'entraînement sur une base logarythmique et par (2) un coefficient de traction, dans des conditions hydrodynamiques et des conditions de lubrification mélangées, inférieur à ce qu'il serait, si l'additif d'amélioration d'économie de carburant n'était pas présent dans le lubrifiant.

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