Turbocharger with air cooled turbine disc

The turbocharger has a turbine disk (3), held at a swiveling stored hub (4). An outer edge of feet (7) of the disk is held to radially aligned rotor blades (6). A gas entrance housing (9) and a nozzle ring (13) is provided with a wastegas flue limiter (11). A cooler contains a refrigerating chamber (18), bordering on the turbine disk and cooling air is supplied from the outside by the gas entrance housing. The refrigerating chamber takes up a section (17) of a channel (16), which serves for the supply of cooling air. The channel is aligned so that a segment of the outer edge is directly readable with cooling air. The channel section is tubular. The refrigerating chamber (18) has two tubular implemented channel sections, and aligned in such a manner that two segments of the outer edge of the turbine disk are readable directly with cooling air.