Patent ID: 11887803
Assignee: SIEMENS HEALTHCARE LIMITED
Field: Mechanical elements (Mechanical engineering)
Classification: CPC H  F | IPC H

Claim 0:
1. An X-ray tube, comprising:
a cathode configured to produce electrons emitted towards a vacuum when energized;
an anode comprising a rotatable anode target disk configured to emit X-rays after sustaining bombardment by the electrons,
wherein the cathode and the anode are contained within a housing that provides a vacuum environment,
a bearing assembly coupled to the rotatable anode target disk, the bearing assembly comprising:
a rotatable shaft configured to rotate with the rotatable anode target disk; and
a bearing part comprising multiple bearing bodies that are (i) disposed at an outer side of the rotatable shaft, (ii) in contact with the rotatable shaft, and (iii) in a rolling fit with the rotatable shaft, the multiple bearing bodies comprising at least one first rolling body configured to be located at a near-end position of the bearing assembly with respect to a position of the rotatable anode target disk, and at least one second rolling body configured to be located at a far-end position of the bearing assembly with respect to the position of the rotatable anode target disk,

wherein a surface of the first rolling body is coated with a first lubrication layer,
wherein a surface of the second rolling body is coated with a second lubrication layer having a different composition than the first lubrication layer, and
wherein a temperature at which the first lubrication layer remains in a solid state is greater than a temperature at which the second lubrication layer remains in a solid state.