Wastegate arrangement for an exhaust gas turbocharger

Abstract

The invention relates to a wastegate arrangement for an exhaust gas turbocharger comprising a turbine housing () having a bearing mount (), wherein the bearing mount () receives a bearing bushing () having a drilled hole (), wherein the drilled hole () holds a shaft () having a first shaft end () disposed in the turbine housing (), and having a second shaft end () retained outside the turbine housing (), wherein the first shaft end () of the shaft () is coupled to a wastegate flap () disposed in the turbine housing () to close a wastegate passage () in a closed position and to release a wastegate passage () in an open position, wherein the shaft () bears an actuating lever () at its second shaft end () outside of the turbine housing (), wherein the bearing bushing () has a second bearing bushing end (), which faces the actuating lever () in the zone of the outer surface of the turbine housing (), wherein a spring element (), a second spring end () of which rests indirectly or directly on a support surface () of the actuating lever (), is used, and wherein the support surface () is disposed at least sectionally around the shaft (). In order to achieve improved operational reliability in such a wastegate arrangement, provision is made in accordance with the invention for the turbine housing () to have a pressure surface (), that the pressure surface () is disposed offset in the axial direction of the shaft () in the direction of the first shaft end () with respect to the second bearing bushing end (), and for a first spring end () of the spring element (), which faces away from the second spring end (), to rest on the pressure surface () of the turbine housing () to generate a spring preload between the pressure surface () and the support surface ().