Flap arrangement for turbine, turbine, and exhaust gas turbocharger

Abstract

The invention relates to a flap arrangement for a turbine of a turbocharger, in particular for a wastegate valve of the turbine, having a spindle for mounting the flap arrangement in a rotatable manner in a turbine housing, having a lever arm, wherein the lever arm is coupled to the spindle, and having a flap disk, wherein the flap disk is coupled to the lever arm. At least part of the lever arm is configured elastically such that applying a closing force to the flap arrangement, when the flap disk is in contact with a flap seat in the turbine housing, provides for relative movement of the flap disk in relation to the spindle, in order to compensate for thermal deformation of the turbine housing and / or wear.

Description

technical field [0001] The invention relates to a valve flap assembly for a turbine of an exhaust gas turbocharger and to a turbine and an exhaust gas turbocharger with a corresponding valve flap assembly. Background technique [0002] Known exhaust gas turbochargers have a turbine with a turbine wheel which is driven by the exhaust gas flow of the combustion engine. A compressor wheel arranged on a common shaft with the turbine wheel compresses the fresh air drawn in for the engine, thereby increasing the pressure of the fresh air. This increases the amount of air or oxygen available to the engine for combustion, which in turn leads to an increase in the performance of the combustion engine. Since the turbine wheel is coupled to the compressor wheel, the pressure to be built up always depends on the quantity of exhaust gas delivered. In certain operating states, it is necessary to reduce or adjust the drive energy acting on the compressor. [0003] In particular, wastega...

AI Technical Summary

Problems solved by technology

But since the same temperature does not exist everywhere and the wall thicknesses in the corresponding regions of the turbine casing may differ from each other, the degree of thermal expansion is not the same everywhere

This can cause thermal deformation of the flap seat for the flap assembly in the turbine housing relative to the bore in which the flap assembly is supported

Thermal deformation is problematic as it can cause leaks for such a rigid disc assembly as the rigid disc no longer sits flat on the disc seat

Increased leakage resulting in loss of performance

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