Automatically moveable floor dust collecting device and impeller wheel, in particular for a floor dust collecting device

The automatically movable floor dust-collection appliance (1) has an impeller (2) with a rotational axis (7), a hub (3) and a tire (4) forming a tire contact surface (5), where a part of the tire contact surface in the cross-section has a profile falling towards the center. The part of the tire contact surface is formed by a profile block. The profile block forms a part of an assigned side surface and forms an area of the tire contact surface. The area of the tire contact surface protrudes in the direction rotational axis.