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International Journal of Automotive Technology > Volume 19(3); 2018 > Article
International Journal of Automotive Technology 2018;19(3): 463-472.
doi: https://doi.org/10.1007/s12239-018-0045-9
WET SINGLE CLUTCH ENGAGEMENT BEHAVIORS IN THE DUAL-CLUTCH TRANSMISSION SYSTEM
Jaecheol Cho1, Yongseok Lee1, Woojung Kim3, Siyoul Jang1
1Kookmin University
3Hyundai PowerTech Ltd.
ABSTRACT
A frictional torque was generated by a lubricated slip contact between a wet clutch pad and a steel separator during a wet clutch engagement. It is necessary to understand the generation of frictional torque to improve the performance of the frictional torque transfer and the durability of the wet clutch system. The analytical modeling of wet clutch torque transfer considers the effects of surface roughness, permeability, the elastic modulus of the frictional material, lubricant viscosity, temperature, etc. Experimental apparatus for wet clutch engagement was designed for the measurement of frictional torque transfer during wet clutch engagement. The experimental results were compared with the analytical results under various operational conditions for the verification of the theoretical analysis to evaluate the performance of the wet clutch system. Some correlations were investigated between the experimental and analytical results. We found that computation by analytical modeling can predict the effects of oil temperature, applied force, and slip speed, as well as engagement period and frictional torque transfer shapes.
Key Words: Wet clutch engagement, Dual clutch, Shudder, Torque transfer, Modified Reynolds equation
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