Bmts Technology Gmbh &co. Kg

Bosch Mahle Turbo Systems Gmbh Co. Kg

Berger, Martin

Martin Kropp

Martin Berger

Rüdiger Kleinschmidt

Dirk Lummer

Jörg Jennes

The invention relates to an exhaust-gas-driven turbocharger having a hydrodynamic plain bearing having a rotor and a stator, the rotor being rotatable with respect to the stator, the rotor bearing surface being located opposite a counter-surface of the stator in order to generate hydrodynamic pressure in the region of a converging gap. In such a hydrodynamic plain bearing, the application properties can be improved by the fact that the rotor bearing surface and/or the counter-surface constitutes in a section view, in the context of a section along and through the rotation axis, a continuous bearing contour that is constituted from convex or concave curvatures and/or from at least two contour segments that are embodied as straight lines and/or curvatures. The invention also relates to a hydrodynamic plain bearing or bearing arrangement having such a plain bearing.

Turbocharger

An exhaust gas turbocharger may include a turbine housing and a turbine arranged in the turbine housing. The turbine housing may include at least two exhaust gas channels and a partition separating the at least two exhaust gas channels from one another. A wastegate valve may be arranged such that the at least two exhaust gas channels are connectable to a bypass duct bypassing the turbine. The wastegate valve may include a valve body and a valve seat interacting with the valve body. The wastegate valve may be configured such that at least one of a ram supercharging operation and a pulse supercharging operation is activated depending on a degree of opening of the wastegate valve.

Exhaust-gas turbocharger

An exhaust gas turbocharger may include a turbine housing and a turbine. The turbine housing may include at least two exhaust gas channels and a partition. A wastegate valve may be arranged such that the at least two exhaust gas channels are connectable to a bypass duct bypassing the turbine. The wastegate valve may include a hollow valve body and a valve seat interacting with the valve body. The wastegate valve may be configured such that at least one of ram supercharging and pulse supercharging is performed. A connecting opening may be arranged between the at least two exhaust-gas channels. The valve body may have a base region configured to facilitate a discharging of an exhaust-gas steam into the bypass duct and/or an overflowing of one exhaust gas channel through the connecting opening into the other exhaust-gas channel.

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Albershausen, Germany

Martin Kropp