Patent ID: 7789636

Claim:
A turbomachine, comprising: a compressor wheel arranged in a compressor housing; a turbine wheel arranged in a turbine housing; and a rotor shaft which is guided in a bearing casing and which has fastened thereto the compressor wheel on the one hand and the turbine wheel on the other hand, a rotor-shaft seal being arranged between a turbine-sided end portion of the bearing casing and the rotor shaft and comprising a counter ring, which is fixed to the rotor shaft, said counter ring having a fixing section fixed to a smaller diameter area of the rotor shaft and an annular collar integrally formed as one piece with the fixing section and arranged substantially at a right angle to the fixing section to at least partly axially rest against a transition area of the rotor shaft leading to a larger diameter of the rotor shaft; and a biasing arrangement having one diaphragm bellows, wherein said one diaphragm bellows is welded to a sleeve body of a screw in sleeve at one end of said one diaphragm bellows and the opposite end of said one diaphragm bellows is welded to a ring body of an adapter plate, wherein said adapter plate is in bias contact with a slide ring such that axial play and wear of slide surfaces of said slide ring are minimized, wherein said slide ring is connected to a connection area of said adapter plate and is fixed by means of a screw-in sleeve with interposition of the biasing arrangement in the bearing casing.