Bosch Mahle Turbo Systems Gmbh Co. Kg

Dirk Blümmel

Matthias Stein

Andreas Wengert

Claus Fleig

A turbocharger, comprising: at least one of a turbine housing, a bearing housing and a turbine wheel, wherein the turbine wheel is rotatably mounted about an axis and includes a guide apparatus with a plurality of guide vanes rotatably mounted in pivot bearings on a guide vane support, wherein the guide vanes influence the flow in a flow channel of the turbine housing; and a spring element, which moveably loads the guide apparatus in an axial direction against a wall of the turbine housing, and wherein the disc springs seal a displacement chamber provided with a displacement mechanism of the guide apparatus against the flow channel.

Turbocharger

The invention relates to a charging device (), more preferably an exhaust gas turbocharger for a motor vehicle, which turbine geometry comprises guide blades () rotatably mounted in a blade bearing ring (), wherein the blade bearing ring () with a side is directly exposed to a hot gas flow () while the side of the blade bearing ring () facing away from this is only indirectly exposed to the hot gas flow (). It is substantial to the invention that the blade bearing ring () on its side directly exposed to the hot gas flow () is produced of a different material than on its side only indirectly exposed to the hot gas flow () wherein the two materials with regard to their heat expansion coefficients are selected in such a manner that the blade bearing ring () at preferentially all occurring operating temperatures expands evenly without warping.

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Schwieberdingen, Germany

Dirk Blümmel