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

An exhaust gas turbocharger having a hydrodynamic plain bearing, comprising:

• a rotor including a rotor bearing surface, the rotor having an axis of rotation;
• a counter-bearing part including a counterface, wherein the rotor bearing surface of the rotor and the counterface of the counter-bearing part face each other to form the hydrodynamic plain bearing, and wherein each of the rotor bearing surface and the counterface, when viewed in longitudinal section through the axis of rotation, forms a continuous bearing contour including at least two merging contour sections configured to provide hydrodynamic load capacities in both a radial direction and an axial direction;
• and
• a bearing housing or a housing part, the counter-bearing part being mounted in the bearing housing or housing part such that a 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 circumferential gap area is spatially connected to a lubricant guide channel, and wherein the circumferential gap area and the continuous bearing contour of the rotor bearing surface or the counterface overlap at least sectionally in the direction of the axis of rotation;
• wherein the rotor includes a rotor shaft and a rotor part, the rotor shaft including a support section supporting the rotor part;
• wherein the rotor part includes a bearing area forming the contour sections of the rotor bearing surface and the rotor part includes a base part adjoining the bearing area;
• and
• wherein an annular clearance space is formed between the rotor shaft and an enlarged inner diameter of the base part of the rotor part.