| 摘要 |
PURPOSE:To always supply an adequate amount of magnetic fluid to supported transit surfaces, by impregnating the magnetic fluid to a porous material. CONSTITUTION:In contact with both poles of permanent magnets 1 annular yokes 2 are provided, and these magnets and yokes are fixed to a housing 3. Between face- to-face positioned surfaces of the annular yokes 2 a porous annular body 6 consisting of nonmagnetic sintered alloy, high molecular porous material, felt and the like is provided, and magnetic fluid is impregnated to this porous annular body 6. |
