| 摘要 |
PURPOSE:To reduce the amount of reactive magnetic fluid by injecting magnetic fluid from the slit in the non-magnetic body provided between the yoke and the shaft. CONSTITUTION:The closed magnetic passage is formed by the permanent magnet 1, annular yokes 2', 2'', and the shaft 4, and leaking magnetic flux is generated between the shaft 4 and the yokes 2', 2''. Since the intensity of leaking magnetic flux becomes higher toward the fine clearances between the annular hoke 2' and the shaft 4, magnetic fluid 5 in the oil sump 8 flows into the fine clearance between the yoke 2' and the shaft 4 to fill the space for perfect sealing. This is supplemented by the surface tension of magnetic fluid. By this constitution, magnetic fluid can be smoothly supplied, and reactive magnetic fluid being stuck within the porous body and not used can be drastically reduced. |
