Drive unit with coupling unit

A drive unit comprising at least one motor, at least one drive shaft and at least one coupling unit, said coupling unit comprising at least one bearing sleeve, at least one input hub, at least one output hub and at least one torsion spring, wherein the bearing sleeve at least partially surrounds the drive shaft, wherein the torsion spring has at least two spring ends, wherein the torsion spring surrounds the bearing sleeve with windings, wherein the input hub is coupled to the drive shaft, wherein input hub is at least partially rotatably mounted on the bearing sleeve, wherein the input hub is at least partially arranged between the two spring ends, wherein the output hub is at least partially rotatably mounted on the bearing sleeve, wherein the spring ends are arranged between the input hub and the output hub in such a way that the input hub acts on the torsion spring upon a rotation caused by the input hub in such a way that the torsion spring increases its diameter and thereby slides on the bearing sleeve, and that upon rotation caused by the output hub, the output hub acts on the torsion spring in such a way that the torsion spring interacts with the bearing sleeve and prevents rotation.