Patent ID: 7970104

Claim:
An assembly comprising an x-ray tube having a rotary anode and a bearing unit for the rotary anode, said bearing unit comprising a shaft and a flange element, to which the rotary anode is attached, wherein: the bearing unit is inserted into a recess inside the x-ray tube, where it is fixed in place; the shaft is held by a first and a second bearing element, wherein: the shaft has an inner track having a single-sided shoulder; the first bearing element comprises a separate first outer ring; the second bearing element comprises a roller bearing attached to the shaft, said roller bearing comprising an inner ring and a second outer ring; wherein a spacer element is fitted between the first and second outer rings; and wherein the shaft has a first diameter at a first side of the shaft adjoining the flange element and a second diameter less than the first diameter at a second side of the shaft away from the flange element so that the first bearing element, the spacer element, and the second bearing element can be assembled on the shaft by sliding the first bearing element, the spacer element, and the second bearing element on the shaft from the second side.