Drive device for driving a vehicle flap

A drive device for driving a vehicle flap comprising

• a cable-like traction means which is suitable for transmitting tractive forces, and
• a deflection roller which has an axis of rotation around which the deflection roller is rotatably mounted, and a guide profile which runs around the axis of rotation and has a groove base and roller surfaces adjoining it on both sides of the groove base, wherein the roller surfaces extend further radially outwards with respect to the axis of rotation than the groove base does,
• wherein the deflection roller is designed to guide the traction means in such a way that a first portion of the traction means is at least in portions in contact with the groove base, while a second portion of the traction means is in contact with one of the roller surfaces, so that the second portion of the traction means is displaced both in the axial direction and radially outward with respect to the axis of rotation and compared to the first portion of the traction means,
• wherein the deflection roller, viewed in a sectional plane containing the axis of rotation, has a cross section according to which each roller surface extends in a convex manner from the groove base to a corresponding side surface of the deflection roller, which delimit the deflection roller, viewed in the axial direction.