| 摘要 |
PROBLEM TO BE SOLVED: To obtain high moment stiffness while reducing the size of a dynamic pressure bearing device. SOLUTION: A dynamic pressure generation part 4 is formed on the entire surface or in one region of the inner peripheral face 3a of a bearing member 3. The dynamic pressure generation part 4 has a first inclined groove 5 inclined toward one direction and a second inclined groove 6 inclined toward the other direction. Each of the inclined grooves 5 and 6 include fluid introduction parts 5a, 6a, and fluid discharge parts 5b, 6b. A first groove region 8 formed by connecting both ends of the first inclined groove 5 in the circumferential direction, and a second groove region 9 formed by connecting both ends of the second inclined groove 6 in the circumferential direction are formed on the inner peripheral face 3a. The fluid introduction part 5a of the first inclined groove 5 is formed in the second groove region 9, and the fluid discharge part 5b of the first inclined groove 5 is formed in a region outside the second region 9. Likewise, the fluid introduction part 6a of the second inclined groove 6 is formed in the first groove region 8, and the fluid discharge part 6a of the second inclined groove 6 is formed in a region outside the first groove region 8. COPYRIGHT: (C)2007,JPO&INPIT
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