Patent ID: 8051968

Claim:
A clutch unit for use in a drive train of a motor vehicle between a drive unit and a transmission having at least one transmission input shaft, said clutch unit comprising: at least one wet running, rotatable clutch device that includes a plurality of clutch discs that are positioned within a surrounding clutch housing and are at least partially wetted by and cooled by a coolant liquid that is cooled by a cooler after the coolant liquid leaves the clutch discs, wherein the cooler is an annular enclosure that is radially outward of and that surrounds the clutch device and has at least one inner wall that is radially outward of and opposite the clutch device and against which cooler inner wall coolant liquid from the clutch device comes into contact under the effect of centrifugal force when the clutch device rotates, and wherein a liquid cooling medium is delivered to the annular enclosure and flows within the annular enclosure in a rotational direction that is opposite to the direction of rotation of the clutch device.