Patent ID: 8142321

Claim:
A control drive comprising: an electric motor having an end bracket; a planetary gear mechanism operatively connected to the electric motor along a longitudinal axis of symmetry, the planetary gear mechanism including a ring gear connected to the end bracket and having a free end, there being an assembly direction F defined in a direction away from the motor and in the direction of the end of the ring gear; a planet carrier; a plurality of planet gears, each gear having peripheral external teeth, the planet gears being mounted on the planet carrier, each planet gear having a front surface relative to the assembly direction F in the area of their respective external teeth, and the ring gear having several angle areas made up of a plurality of internal teeth with a respective angle area assigned to each of the planet gears, the several angle areas being at the end of the ring gear in a predetermined angle position relative to the planet carrier, wherein a first axial spacing between the front surface of a first planet gear and a first angle area of the ring gear differs from a second axial spacing between the front surface of a second planet gear and a second angle area of the ring gear.