Drive device for an opening mechanism for opening a movable opening element of a vehicle, and opening system for a vehicle

A drive device for an opening mechanism to open a movable opening element of a vehicle, the drive device comprising:

• a drive unit to produce a drive torque;
• a housing with a mounting side that is oriented towards a vehicle part of the vehicle to mount the drive device;
• a transmission to increase the drive torque of the drive unit, the transmission comprising a first gear unit on the driven side that includes a first gear that has a first rotational axis and a first radius, and includes a second gear unit on the output side for coupling to the opening mechanism and having an output axis;
• and
• a cover element provided inside of the housing,
• wherein the first gear unit and the second gear unit are in operative connection with one another,
• wherein the output axis extends in an output region between the mounting side and the first rotational axis, and has a distance from the first rotational axis that is smaller than the first radius,
• wherein the second gear unit has a second gear for rotation about the output axis,
• wherein the first gear and the second gear are in operative connection through a third gear that is axially connected to the first gear,
• wherein the first gear and the second gear are separated from one another by a cover of the cover element, and
• wherein the housing has a spreading geometry via which at least two retaining elements of the cover element, which extend from the cover to a housing cover of the housing, are adapted to be pressed in opposite directions during mounting of the first and second gear units so that the cover element is immobilized between a first housing element of the housing and the housing cover.