Drive device having a brushless electric motor

A drive device, comprising:

• motor electronics;
• a gearbox housing having a hollow-cylindrical housing portion;
• a brushless electric motor in an external rotor embodiment assembled in said gearbox housing, and being able to be coupled or is coupled to a gearbox and being actuated by means of said motor electronics, said brushless electric motor having a stator bush and a stator with a slot cell insulation and a plurality of stator teeth being disposed in a star-shaped manner and being wound with a stator winding, said brushless electric motor further having a drive shaft and a rotor revolving about said stator and connected to said drive shaft that is routed through said stator bush, said stator bush having a power take-off type first sleeve portion for mounting in a rotationally fixed manner said stator bush in said hollow-cylindrical housing portion of said gearbox housing and a second sleeve portion onto which said slot cell insulation that at least partially encompasses said stator teeth in an axial direction is disposed;
• and
• an annular element, being disposed between said power take-off type first sleeve portion and said slot cell insulation, is disposed onto said second sleeve portion of said stator bush, said annular element having at least one joining element which engages in a corresponding joining contour of said power take-off type first sleeve portion of said stator bush.