| 摘要 |
PURPOSE:To simplify extremely attachment of a seal only by providing an annular elastic body formed of a supply magnetic fluid holding member by the use of a strip-like or linear elastic member to expand the annular elastic body after assembling a yoke. CONSTITUTION:An annular elastic member 15 as a supply magnetic fluid member attached in a space formed between both side yokes 13a, 13b and the outer periphery of a magnet member 12 is formed into a ring of an elastic member such as strip-like plastic, metal, etc. the diameter of which is smaller than the outer diameter of the magnet member 12, and then attached to said member 12. This annular elastic body 15 can be expanded to be easily assembled onto the outer periphery of the magnet member 12, and since the diameter of the body 15 is formed smaller than the outer diameter of the magnet member, a contracting force acts under the assembled condition to press the body 15 against the outer peripheral wall of the magnetic member 12 so that the body 15 is firmly fixed in position along the outer peripheral wall. |
