| 摘要 |
PROBLEM TO BE SOLVED: To provide a static pressure gas bearing device to prevent the generation of a pressure reservoir on a fit-in surface, suppress deformation of a bearing sleeve, and maintain excellent bearing performance. SOLUTION: A bearing sleeve 2 fitted in the inner radial surface of a housing 1 is provided, and gas is fed from the housing 1 side to bearing surfaces JB and JB having the throttle holes 21a and 22a of a bearing sleeve 2. A main shaft 3 is supported by static pressure gas on the bearing surfaces JA and JB. In a static pressure gas bearing device of this constitution, an annular groove 23 is formed in a fit-in surface B between the housing 1 and the bearing sleeve 2, and an exhaust passage 24 communicating with the atmosphere through the annular groove 23 is formed.
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