| 摘要 |
PROBLEM TO BE SOLVED: To stably bear both ends of a rotor shaft with liquid dynamic pressure bearings. SOLUTION: Both ends of a rotor shaft 1 are rotatably supported with a pair of liquid pressure dynamic bearing parts 2, 2. The bearing part 2 holds lubricating oil with a gap 2c having only one open part 2b. A capillary oil seal shield part 3 is installed in the open part 2b and prevents vaporization of liquid and wetting. In the bearing part 2, a journal bearing 4 is installed coaxially, prevents precession of a rotor shaft 1, and forms a liquid reservoir 4b in the bottom part. In the rotor shaft 1 between a pair of the bearing parts 2 and 2, a rotation driving part 10 and a load 13 are installed. Thus a spindle motor, which can stabilize rotation and is resistant to external vibration, is constituted.
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