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A BEARING ASSEMBLY FOR A ROTATING ANODE TYPE X-RAY TUBE

IP.com Disclosure Number: IPCOM000109659D
Publication Date: 2005-Mar-24
Document File: 6 page(s) / 46K

Publishing Venue

The IP.com Prior Art Database

Abstract

In one embodiment, the bearing assembly for a rotating anode type X-ray tube includes a cavity configured for accommodating a rolling bearing comprising a plurality of rolling members. A solid lubricant is coated on the surface of each rolling member. A liquid or semi-solid lubricant is filled around the rolling bearing and separated from the rolling member by a seal disposed at the end faces of the rolling bearing.

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A BEARING ASSEMBLY FOR A ROTATING ANODE TYPE X-RAY TUBE

FIELD OF THE INVENTION

[0001]   This invention relates generally to anode bearings, and more particularly to a bearing assembly for a rotating anode type X-ray tube.

BACKGROUND OF THE INVENTION

[0002]    Generally, a bearing assembly for a rotating anode type X-ray tube makes use of a lubricant that has very low vapor pressure at a high temperature for example, about 400 deg. C, to maintain predetermined vacuum level within the tube.  A lubricant that does not release any particles into the vacuum is always chosen, for use with the bearing, to maintaining high voltage stability within the tube. 

[0003]   Known configurations of bearing assemblies such as, rolling bearing assemblies for a rotating anode type X-ray tube use solid lubricants, because of the ability of the solid lubricants to sustain high temperature and also offer high voltage stability.  Typically, solid lubricants such as, Silver or Lead are coated the surfaces of e.g. rolling members of the bearing assemblies.  Above 400°C, Silver is usually preferred, as Silver allows for longer, more powerful exposures than lead.

[0004]   However, Silver is much harder than lead and therefore, increases the noise generated during operation of the X-ray tube.  Liquid and semi-solid lubricants are preferable over solid lubricants for noiseless operation of the bearings.

[0005]   Thus there exists a need for a bearing assembly that can make use of solid lubricants and also accommodate liquid or semi-solid lubricants, such as, for example, oil, grease, powder, liquid or wetting metal, and thereby provide improved lubrication at high temperature, high voltage stability and also provide a substantially noiseless operation.

SUMMARY OF THE INVENTION

[0006]    In one embodiment, the bearing assembly for a rotating anode type X-ray tube includes a cavity configured for accommodating a rolling bearing comprising a plurality of rolling members.  A solid lubricant is coated on the surface of each rolling member.  A liquid or semi-solid lubricant is filled around the rolling bearing and separated from the rolling member by a seal disposed at the end faces of the rolling bearing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007]    FIG.1 shows a schematic view of a bearing assembly according to one embodiment of the present invention.  

[0008]    FIG. 2 shows a schematic view of the bearing assembly according to one embodiment of the present invention. 

DETAILED DESCRIPTION OF THE INVENTION

[0009]    Various embodiments of the present invention provide a bearing assembly for a rotating anode type X-ray tube.

[0010]    FIG.1 and FIG.2 show a bearing assembly according to one embodiment of the present invention.  The bearing assembly 10 includes a cavity 20 configured for accommodating at least one rolling bearing 30.  The bearing 30 includes a plurality of rolling members 35, wherein each rolling member 35 (see FIG. 2) is coated with a solid lubricant 60.  A li...