Actuating drive for a motor vehicle, comprising an electronic motor, a transmission, and a spindle

An actuating drive comprising:

• an electric motor configured to drive a drive shaft;
• a transmission having a) a housing rigidly connected with the electric motor, b) a transmission gear defining splines that engage with the drive shaft and defining a rotational axis, and c) a bearing part located between the transmission gear and the housing;
• and
• a spindle defining a spindle axis extending parallel to the rotational axis, wherein the spindle extends through an internal thread of the transmission gear and through outlets in the housing, and is in engagement with the internal thread;
• wherein the housing defines a cylinder bore configured to receive the bearing part and defines a cylinder axis;
• wherein the bearing part defines a three-dimensional area that, viewed in a direction of the cylinder axis, defines a largest cross-sectional area thereof at a right angle to the cylinder axis at an intersection of the cylinder axis with the rotational axis;
• wherein the largest cross-sectional area defines a circular area;
• wherein, with increasing distance from the intersection along the cylinder axis, a size of the cross-sectional area decreases;
• wherein the bearing part defines two bearing shells, each of which defines a bearing opening centered relative to the rotational axis;
• and
• wherein the spindle penetrates said bearing openings and the transmission gear is mounted rotatably in the bearing openings.