| 摘要 |
PURPOSE:To prevent deterioration in bearing accuracy by providing a fluid conveying means for conveying fluid from both axial ends toward the center of a bearing and removing need for using piping for feeding and discharging a high pressure fluid. CONSTITUTION:Since a magnetic fluid is used as a bearing fluid, the bearing fluid is prevented from outwardly flowing by itself due to a magnet 8 and a yoke 7. The inside end of the yoke 7 is tapered, causing the magnetic fluid 3 to be drawn in a direction in which a gap toward a bearing guide 1 is smaller, and, even when a bearing body 2 is axially moved, the magnetic fluid 3 is prevented from remaining on the bearing guide which is off the bearing, due to its viscosity. Accordingly, a magnetic fluid sealing device is used as a fluid sealing means, and the magnetic fluid which is free from restraint has little or no adverse effect on bearing accuracy.
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