| 摘要 |
PURPOSE: An oil filling device of a fluid dynamic bearing is provided to perfectly discharge air of a shaft and a bearing while injecting oil by installing a sealing device. CONSTITUTION: An oil filler of a fluid dynamic bearing comprises an injector(1) inserted to an injecting hole(2); a shaft(55) penetrating a middle portion of the injecting hole; a sealing device preventing air from letting in by being mounted in the injecting hole; a protrusion(3) arranged on a specific position of the injecting hole; a sealing material(4) closing a space; and a bearing(54). To inject oil into the shaft and the bearing, the injector is filled with the oil. Then, the injector is inserted to the injecting hole to penetrate the sealing material. The oil is injected to the injecting hole, and is expanded toward outside from a middle portion of the shaft. Thereby, the air contained between the shaft and the bearing is pushed outside through an upper side. Moreover, the oil filler of the fluid dynamic bearing perfectly discharges the air of the shaft and the bearing while injecting the oil by installing the sealing device.
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