Patent ID: 7852989

Claim:
A rotating anode x-ray tube comprising: a vacuum housing; a cathode positioned in the housing; a rotatable anode positioned in the housing opposite the cathode; a fixed, inner shaft positioned in the housing and affixed to the housing, the shaft having an inner race at one end and a cylindrical shoulder at the other end; at least one inner ring, positioned on the shoulder of the shaft and retained axially by staking the shaft, the inner ring having an inner race; a rotatable, outer sleeve affixed to the anode and surrounding the shaft, the sleeve having one ring with one outer race, another ring with another outer race, and a spacer positioned between the one ring and the other ring, the one outer race opposing the inner race on the shaft and the other outer race opposing the inner race on the inner ring; the one ring and the other ring made from high hot-hardness material; the spacer made from a constant coefficient of thermal expansion material and affixed to the one ring and the other ring; and roller bodies positioned between the shaft inner race and the one outer race and between the one-piece inner race and the other outer race.