Flap device for opening and closing a wastegate channel in a turbine housing of a turbocharger, turbocharger, and method for production

A turbocharger for an internal combustion engine, the turbocharger comprising:

• a rotor shaft;
• a bearing housing in which said rotor shaft is mounted in a rotatable manner;
• a turbine wheel disposed for conjoint rotation on said rotor shaft;
• a turbine housing mechanically secured to said bearing housing;
• a wastegate duct formed in said turbine housing;
• and
• a flap configuration for opening and closing said wastegate duct, said flap configuration containing:
• a cylindrical bushing having at least one groove formed therein;
• a lever having a through-bore formed therein and in said through-bore said cylindrical bushing is disposed;
• a spring sheet disposed in said at least one groove such that a radial clamping force of said spring sheet acts between said through-bore and said cylindrical bushing;
• a flap having a pin disposed on said lever element such that said pin passes through said cylindrical bushing;
• a cover disk disposed on an opposite side from said flap and having an opening formed therein through which said pin of said flap passes;
• and
• said flap is riveted to said lever by means of said pin.

A method for producing a flap configuration, which comprises the steps of:

• providing a lever having a through-bore formed therein;
• providing a bushing having at least one groove formed therein and a spring sheet disposed in the at least one groove, and introducing the bushing into the through-bore in the lever together with the spring sheet, such that a radial clamping force acts between the through-bore and the bushing;
• providing a flap having a pin;
• disposing the flap on the lever such that the pin passes through the bushing;
• placing a cover disk on an opposite side from the flap such that the pin projects through an opening in the cover disk;
• and
• riveting the flap to the lever by means of the pin.