| 摘要 |
A rotor shaft for a high speed rotary machine has bearing parts which, after being fitted in the machine, are held in oil-lubricated sliding-contact bearings. The rotor shaft is provided, in the region of at least one bearing part, with an outer casing having a cylindrical outer surface which forms, in the region of the the bearing part, the outer surface of the rotor shaft. The outer casing comprises a separate, one-piece cylindrical sleeve arranged directly on the shaft part situated inside the sleeve and forming a structural unity therewith. The contact surface between the sleeve and the shaft part situated inside the sleeve has a cylindrical shape. The cylindrical sleeve forms a thermally insulating layer between the outer surface of the sleeve and the shaft situated inside the sleeve.
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