Abstract: A bearing mounting assembly for rotating anode X-ray tubes is disclosed having a pair of spaced apart bearings mounting a rotating shaft within a hollow bearing housing. A sleeve circumscribes the bearing housing and has shoulders engaging a spring washer to provide axial positioning and preloading of the bearings through the spring washer by means of radially disposed set screws in the sleeve engaging the bearing housing.

Abstract: An X-ray tube is disclosed having a cathode and rotating anode located within a glass envelope. The rotating anode comprises an annular disc forming the target area. The disc is integrally connected to a stem which in turn is connected to a hollow cylindrical rotor. The interior of the cylindrical rotor extends over the anode support shaft and bearing structure. The anode shaft supports the rotor, stem and anode disc and is integrally connected thereto via a thin-walled, cup-shaped member made of a low heat conductive metal. The interfaced connections with the cup-shaped element are accomplished through minimal contact surfaces to provide a thermal barrier against the heat energy generated in the anode structure, thereby preventing the heat energy from passing through to the shaft and bearing structure.