ROTARY ANODE X-RAY TUBE

PURPOSE:To obtain excellent rotating characteristics and improve a rotating life by inserting a sleeve with low thermal conductivity and low coefficient of friction into a rotor, rotatably supporting it on a stationary shaft through ball bearings on both ends of the sleeve, and further fitting a spring pre-loading an outer ring of a ball bearing to the rotor end. CONSTITUTION:A sleeve 9 made of a material with low thermal conductivity and low coefficient of friction is inserted into a rotor 2, ball bearings 3, 4 are coupled with both ends of a stationary shaft 7 fixed to a vacuum housing through a inner rings respectively, and the outer rings of the ball bearings 3, 4 are inserted inside the sleeve 9. In addition, the sleeve 9 is pressed by a snap ring 6, which is fixed to the rotor 2 with a screw 8. A Belleville spring 5 is fitted between the snap ring 6 and ball bearing 4, the Belleville spring is compressed and the compression load is applied to the outer ring of the ball bearing 4 so as to maintain the gap between the ball bearings 3, 4 at zero at all times.