PURPOSE: To obtain a porous static pressure pneumatic bearing with stability and high rigidity by utilizing porous ceramic which has a specified permeability for a bearing surface, and thereby preventing generation of self-excited oscillations under normal usage.
CONSTITUTION: A porous static pressure pneumatic bearing is composed of a porous ceramic layer 1 with a specified permeability, a gas supplying part 2 for supplying gas such as air through the porous ceramic layer 1, and a shaft structural body 3. In the porous ceramic layer 1, material having permeability not less than 7×1015m2 is adopted R a bearing surface. In case of supporting the shaft structural body 3 by means of the porous static pressure pneumatic bearing, first, a gap of 5 to 20μm is formed on the cylindrical bearing surface of the porous ceramic layer 1 for installing the shaft structural body. Then, the shaft structural body 3 is rotated under the condition that a specified pressure of gas is supplied to the gas supplying part 2.
| JP2000024430 | FILTER MATERIAL FOR MOLTEN METAL |
| JPH02185244 | POROUS ARTIFICIAL BONE |
| WO/2001/090029 | POROUS MOLDED BODIES FROM POLYCRYSTALLINE SILICON NITRIDE AND METHOD FOR PRODUCING THE SAME |
KITAMURA KAZUMASA
MISAWA HIDENOBU
| JP2081925B | ||||
| JPH0289811A | 1990-03-29 | |||
| JPS63186030A | 1988-08-01 |
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