| 摘要 |
PROBLEM TO BE SOLVED: To efficiently form up a recessed separation groove simple in constitution, and thereby provide an inexpensive dynamic pressure bearing device. SOLUTION: Let each recessed separation groove 15e be so constituted as to be instantly formed up by letting cut-out parts themselves 15d and 15d provided for paired partial circular arc shaped members 15a and 15a adjacent to each other in the circumferential direction when the plural partial circular arc members 15a are assembled in a ring shape, be faced to each other in the circumferential direction. This constitution thereby allows the recessed separation groove 15e to be formed up at low cost without processing parts such as machining high in cost and the like, which have been done so far in the past.
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