The paper discusses the transient and steady state results obtained from a light duty axle efficiency lest in evaluating several multigrade gear lubricants for their fuel economy performance. Data collected with internal reference oil highlights the repeatability of several typical driving conditions in different axles. The transient to steady-state comparisons between single grade SAE 90 to multigrade gear lubricants were made under a variety of pinion torques and speeds to simulate highway and city driving conditions. A discussion of lubricant rheology and its relationship for optimum torque efficiency and axle temperature is provided. The study provides the following conclusions: - Several mineral and synthetic based gear lubricants were evaluated under various driving conditions. - The dominant factors that affect axle performance at high speed and low torque conditions are gear lubricants with efficient additive systems blended to high VI and low viscosity. - The dominant factors that affect axle performance at high speed and moderate torque conditions are gear lubricants with efficient additive systems blended to high VI. - The dominant factors that affect axle performance at low speed and high torque are gear lubricants with efficient additive systems blended to high VI. - The effect of different sulfur-phosphorus additive systems can be evaluated on the basis of peak temperature control and improved torque efficiency. - Sulfur-phosphorus based additive systems in properly formulated high viscosity base blends can provide improved fuel economy. - The collective optimization among the additive system, VII and base oil is important for overall improved fuel economy.
Effect of rheological properties on the transient and steady state axle efficiencies of multigrade gear lubricants
2002
8 Seiten, 13 Bilder, 3 Tabellen, 21 Quellen
Aufsatz (Konferenz)
Englisch
Rheological Properties Affecting the Fuel Economy of Multigrade Automotive Gear Lubricants
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