What does wet dual-clutch mean?

[GeorgeLee]

Wet dual-clutch refers to a dual-clutch transmission where the clutch plates are immersed in transmission oil. The wet dual-clutch relies on the oil for cooling, with transmission oil added to the sealed clutch assembly, supplemented by a radiator. A wet dual-clutch transmission must include a hydraulic pump, lubricating fluid, cooling pipes, and an external cooling system. Wet clutches primarily operate hydraulically and are generally used in automatic transmissions and continuously variable transmissions that require higher smoothness. Wet clutches are divided into single-plate and multi-plate types. When used as a starting device for vehicles, multi-plate wet clutches are mostly employed. The multi-plate design increases the friction area, ensuring small diameter with high torque capacity.