A centrifuge rotor for a free jet centrifuge for cleaning lubricating oil of an internal combustion engine. The rotor has an inlet, at least one drive nozzle outlet, and a sediment deposition surface interiorly in the rotor. A bearing is provided for rotatably mounting the rotor in a surrounding housing where the bearing includes a friction bearing which simultaneously forms the rotor inlet and a roller bearing which is receivable in a bearing receptacle formed in the surrounding housing. The roller bearing is sealed off from the rotor interior.