| 摘要 |
PURPOSE:To eliminate the isolation and flowout of magnetic fluid even when a shaft moves linearly at a high speed by enhancing the retaining force of the fluid with permanent and electric magnets, using a pair of oblique yokes to form a slope in the magnetic field and enhancing the recovery effect of the fluid. CONSTITUTION:Magnetic fluid 19 is held by a magnetic field from an electromagnet 15 and a permanent magnet 18 between a shaft 14 and a yoke 16, and even if the fluid 19 is flowed out to one bearing 13 side due to the slope of the magnetic field formed by an oblique yoke 17, it is attracted to the end opposite side to the yoke 17, and again returned to between the shaft 14 and the yoke 16. Since other electromagnet 15 is used in addition to the magnet 18, the intensity of the magnetic field can be remarkably enhanced, and even if the shaft 14 linearly moves at a high speed, the fluid 19 is not stripped off nor flowed out from between the shaft 14 and the yoke 16. |
