Browse Publications Technical Papers 2011-01-2128
2011-08-30

Impact of Viscosity Modifiers on Gear Oil Efficiency and Durability 2011-01-2128

This paper is part one of a longer term comparison of viscosity modifier behavior in modern automotive gear oil (AGO) fluids and the impact of these properties on fluid efficiency and durability. This first installment will compare the rheological properties, including EHD film thickness and traction coefficients, of the fluids across broad operating temperature, shear and load regimes and correlate these findings with rig efficiency testing.
The effects of traction, EHD film thickness and high shear rheology on operating temperature are well documented and it is of particular interest to determine the extent to which different viscosity modifiers can beneficially impact these properties compared to a Brightstock-based SAE 80W90 grade fluid. The efficiency improvements of a VM would be for naught if it were not sufficiently shear stable and so comparisons are made between shear stable VM technologies.
The final discussion introduces new tapered roller bearing shear test conditions that correlate more closely to fluid shear in the field than the current 20 h tapered roller bearing shear test, CEC L-45-A-99.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% off list price.
Login to see discount.
We also recommend:
TECHNICAL PAPER

Setting Differential Pinion Bearing Preload Using System Stiffness as Estimated by Frequency Response

2016-01-1130

View Details

TECHNICAL PAPER

Variation in Cyclic Deformation and Strain-Controlled Fatigue Properties Using Different Curve Fitting and Measurement Techniques

1999-01-0364

View Details

TECHNICAL PAPER

Self Adjusting Technology in a Clutch

960981

View Details

X