| 摘要 |
PROBLEM TO BE SOLVED: To improve sealing performance by performing the stable holding of a magnetic fluid in the tip end of a magnetic pole, and enhancing a pressure tightness characteristic in a sealing part of this magnetic fluid. SOLUTION: This sealing device 1 is constituted so as to utilize a magnetic fluid to be set up in an annular clearance 4 lying between a bearing part 3 (housing member) and a turning shaft 2. In this case, a position of a tip end 7b of a pole member 7 (first pole part) is set to the position being opposed to the other side peripheral wall surface 2a adjacent to a ring groove 8a formed in a second pole part 10, while a magnetic fluid ML is provided in space between an inner circumferetial wall surface 7a in and around the tip end 7b of this pole member 7 and the peripheral wall surface 2a. |
