Electric Machine and Rotor

An electric machine for a vehicle, the electric machine comprising:

• a rotor with a rotor shaft mounted in two rolling bearings, the rotor comprising:
• a laminated rotor core;
• a filler body comprising an aluminum die-cast alloy cast onto the laminated rotor core;
• a first shaft journal having an air inlet opening;
• a second shaft journal having an air outlet opening;
• and
• a ventilation unit;
• wherein the filler body connects the laminated rotor core rotationally conjointly to the first shaft journal and the second shaft journal;
• the laminated rotor core includes a central axial bore partially filled by the filler body forming an axial cooling channel for cooling air within the central axial bore;
• the shaft journals drive the ventilation unit;
• and
• rotation of the ventilation unit draws an air stream in via the air inlet opening, conveys said air stream through the axial cooling channel, and discharges said air stream via the air outlet opening;
• a stator having a laminated stator core and stator winding heads arranged at opposite end sides of the laminated stator core;
• and
• a housing surrounding the stator in a radial direction;
• wherein
• the stator and the housing form, between them, an outer cooling channel running along the laminated stator core and the stator winding heads and connecting two opposite end sides of the stator winding heads to one another;
• the ventilation unit forms a suction side on a first end side of the laminated rotor core and a pressure side on a second end side of the laminated rotor core, as the rotor shaft rotates, such that air is drawn in on the suction side and conveyed through the axial cooling channel of the rotor and the outer cooling channel;
• and
• the housing comprises a liquid cooling channel of a circulation cooling circuit, within which a cooling liquid circulates and cools the housing.