Gear drive unit with at least two engines

Gear drive unit (10), in particular for adjusting movable parts in a motor vehicle, having at least two, each having a motor shaft having (18) motors (12), wherein the at least two motor shafts (18) at least two transmission elements (64, 66) drive, which at least two shafts (68, 70) are mounted, characterized in that the at least two shafts (68, 70) are arranged coaxially to each other.