| 摘要 |
A bearing structure of a rotary machine is provided wherein a shaft (2) is supported on housings (7, 18) through rolling bearings made of a ceramic material, solid lubricants made of a powder lubricant of CaF2, Cr2O3, etc. are disposed adjacent to and on both sides of the rolling bearings and seal rings (10, 11) are disposed between the shaft (2) and the housings (7, 18) and on the sides of the solid lubricants. In a ultra-high speed rotary machine, this structure provides a bearing which is excellent in heat-resistance, deformation resistance, wear resistance and durability. The temperature of the bearing structure is raised as a whole to a high temperature without cooling the housings to provide solid lubrication by the solid lubricants, and to reduce drastically frictional resistance. The frictional resistance is further reduced under a high temperature condition to attain low friction and to drastically reduce the wear quantity of the bearing. Moreover, since this bearing structure does not use oil lubrication, an oil lubrication system can be eliminated and hence the occurrence of a fire due to high temperature can be eliminated. |
