| 摘要 |
In an exemplary embodiment, the shaft for the rotating anode is supported by ball bearings in a tubular support-mounting extending into the envelope of the tube. Particularly in the case of rotating anodes, which rotate very rapidly (e.g. 300 Hz), it is disadvantageous that rubbed-off residue falls out of the bearings, on the one hand, and that lubricant leaves the bearings, on the other hand. For the improvement of the operating properties and a permanent lubrication, and the improvement of the high voltage strength by avoidance of loose particles in the tube envelope, the disclosure provides an arrangement of covers on the bearings and possibly one or more radial barriers rotating with the shaft between the stationary covering parts. A rotating anode x-ray tube with a bearing protected in accordance with the disclosure is particularly suited for use in x-ray tubes with very rapidly rotating anode plates.
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