Exhaust gas turbocharger having a hydrodynamic plain bearing or a hydrodynamic plain bearing

Abstract

An exhaust gas turbocharger having a hydrodynamic plain bearing or a hydrodynamic plain bearing, comprising a rotor () and a counter-bearing part () assigned to the rotor (), wherein a rotor bearing surface () of the rotor () and a counter-surface of the counter-bearing part () face each other to form a hydrodynamic plain bearing, wherein the rotor bearing surface and/or the counterface, when cut along and through the axis of rotation (R) in sectional view, form(s) a continuous bearing contour forming at least two contour sections (toto) to provide hydrodynamic load capacities in both radial and axial directions, and wherein the counter-bearing part () is mounted in a bearing housing () or housing part. In order to be able to provide such an exhaust gas turbocharger with a compact and efficient bearing arrangement having a hydrodynamic plain bearing, wherein at the same time the hydrodynamic plain bearing can be easily mounted with a small number of parts, provision is made according to the invention that in that a preferably circumferential gap area () for forming a trapped oil film is formed between an outer contour of the counter-bearing part () and the bearing housing () or the housing part, wherein the gap area () is spatially connected to a lubricant guide channel (), and in that the gap area () and the continuous bearing contour of the rotor () and/or of the counter-bearing part () overlap at least sectionally in the direction of the axis of rotation (R).