| 摘要 |
PURPOSE:To improve thermal conductance so as to reduce a temperature difference between an inner ring and an outer ring by placing a permanent magnet on the side face of a shield plate, filling magnetic fluid between the shield plate and the inner ring/and the outer ring, and holding the fluid by the operation of a permanent ring. CONSTITUTION:Magnetic fluid 17 is filled in spaces between a shield plate 14 and an outer ring 12/and an inner ring 11. This magnetic fluid 17 is held by the operation of a permanent magnet 15. Accordingly, the inner ring 11 and the outer ring 14 and the shield plate 14 and brought into contact with one another with a wide area by the magnetic fluid 17. Since heat transfer paths are formed by the magnetic fluid 17, the heat transfer of the inner ring 11 and the outer ring 12 is improved in thermal conductance because of three heat transfer paths, that is, a heat transfer path through a roller 13 and two heat transfer paths (rear and front surfaces) through the magnetic fluid 17 and the shield plate 14, and the generation of difference in temperature between the inner ring 11 and the outer ring 12 is controlled. |
