The invention relates to a device for influencing an exhaust gas flow, in particular for controlling sound emission in an exhaust gas system of a motor. Said device comprises a closure element, for example, a motor-driven flap in order to displace the closure element in the exhaust gas flow, that is arranged in a displaceable manner in the exhaust gas flow (S). Optional pressure pulsations can be produced or influenced in the exhaust gas flow which lead to audible sound emission. Due to said device, a so-called sound design of an internal combustion engine can be achieved. The drive device (drive motor (24) and power transmission device to the closure element) is equipped with an active cooling system (22, 26).