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Modeling Torque Converter Clutch Viscous Damper Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1985 by SAE International in United States
Annotation ability available
A viscous damper is used as part of the automatic transaxle torque converter in some new passenger cars for improved driveability and fuel economy. A viscous silicone fluid is a critical component of the damper. Fluid viscosity-shear rate characteristics were determined in the laboratory for temperatures of 25 to 150 °C at shear rates from 400 to over 6000 reciprocal seconds. Using these data, and the dimensions of the viscous damper, a mathematical model was developed which predicts viscous damper output torque. Correlation between model predictions and actual measured torques from dynamometer tests was excellent. As a result, the mathematical model is useful for predicting viscous damper performance from measured fluid viscosity-shear rate characteristics. Also, since the model includes the critical viscous damper dimensions, it can be used for determining effects of damper design modifications on damper performance.
CitationTung, S. and Linden, J., "Modeling Torque Converter Clutch Viscous Damper Performance," SAE Technical Paper 850459, 1985, https://doi.org/10.4271/850459.
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