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Computational Study of Drag Torque in Wet Clutch System of DCT by Groove Patterns
FISITA2016/F2016-THBD-004

Authors

Jang, Siyoul - Department of Automotive Engineering, Kookmin University, Seoul, South Korea
Kim, WooJung - Hyundai PowerTech Company, South Korea

Abstract

KEYWORDS – Groove Patterns; Wet Clutch; Drag torque; dual clutch transmission fluid (DCTF) temperature; DCT

ABSTRACT –

Drag torque is inevitable when a wet clutch of DCT system is disengaged and can account for approximately 10% of the total torque transfer of the engine. Although this problem cannot be completely avoided, the overall torque transfer could be reduced by a better fuel economy mechanism in automobile powertrain systems. Many design parameters for the wet clutch pad have been suggested to reduce drag torque by controlling transmission fluid flow behaviors through groove patterns. In this work, we compare several groove patterns by calculating the fluid flow in the gap between the clutch contact surfaces to reduce drag torque by 20% while the wet clutch system is disengaged.

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