Rotor for an electric machine

A rotor for an electric machine, the rotor comprising:

• a first shaft journal;
• a second shaft journal;
• a laminated rotor core;
• a filler body cast onto the laminated rotor core wherein the filler body and the laminated rotor core rotate conjointly;
• wherein the filler body rotates with the shaft journals and a torque applied to the shaft journals is transmitted to the laminated rotor core;
• a cooling duct extending through the shaft journals and the filler body along an axis of the filler body and the rotor core;
• and
• a media duct element arranged between the shaft journals and internal to the filler body;
• wherein the first shaft journal includes a first axial bore;
• the second shaft journal includes a second axial bore;
• an exterior of the media duct element and an interior of the filler body in conjunction form a jacket-like cavity surrounding the cooling duct;
• the media duct element defines a fourth axial bore connecting the first axial bore to the second axial bore, so the first axial bore, the second axial bore, and the fourth axial bore together form the cooling duct running through the first shaft journal, the second shaft journal, and the media duct element;
• a first short-circuiting ring;
• and
• a second short-circuiting ring;
• wherein the first shaft journal includes a first radial bore;
• the second shaft journal includes a second radial bore;
• the first radial bore is connected to the first axial bore;
• the second radial bore is connected to the second axial bore;
• the first short-circuiting ring radially surrounds the first radial bore;
• and
• the second short-circuiting ring radially surrounds the second radial bore so, during a rotation of the shaft journals, a cooling medium may be forced out of the radial bores radially to the outside in the direction of the short-circuiting rings and come in contact with the short-circuiting rings.