Actuating device for an exhaust flap

The invention relates to an actuating device for an exhaust flap of a boost pressure controller of turbocharged internal combustion engines, in which invention the exhaust flap is arranged pivotably in an exhaust-gas line, in particular in the housing of a turbine of an exhaust-gas turbocharger, and controls the opening cross section of a bypass line which bypasses the turbine in a manner which is dependent on the compressor-side boost pressure, wherein the exhaust flap is arranged on an actuating arm which is fastened on a shaft which is mounted rotatably in the exhaust-gas line, which shaft can be adjusted outside the exhaust-gas line via an actuating lever and a control rod which is articulated thereon and via a linear actuating motor. In order to avoid oscillation-induced buzzing noise in the actuating device, it is proposed that a frictional damper (34, 44, 46) is connected into the force flow between the shaft (24) and the control rod (30), in particular for system damping in the region of the exhaust f