Drive device for an actuator

A drive device for an actuator, comprising:

• an electric machine including:
• a rotor rotatably mounted in a housing;
• a stator fixed to the housing;
• and
• a bearing shield situated in the housing that has at least one axially extending sleeve-shaped bearing segment for a rotatable bearing of a drive shaft, which bears the rotor of the electric machine, the bearing shield having an axially extending sleeve-shaped retaining segment that is held with a frictional fit in a sleeve-shaped end segment of the housing and that has a diameter that is greater than a diameter of the bearing segment, at least one radially extending and annular disk-shaped floor segment of the bearing shield being formed between the retaining segment and the bearing segment;
• wherein the retaining segment has a first axial partial segment, connected to the floor segment, having a first outer diameter, and a second partial segment, connected to the first partial segment, having a second outer diameter, the second outer diameter being larger than the first outer diameter, wherein the floor segment is coplanar with a plane that is perpendicular to an axis of rotation of the drive shaft, and wherein the floor segment is maintained coplanar with the plane on account of the frictional fit being between the second partial segment and the sleeve-shaped end segment of the housing and not between the first partial segment and the sleeve-shaped end segment of the housing.