| 摘要 |
PURPOSE:To prevent magnetic powder from leaking from an operation void by providing a magnetic powder deflecting blade concentrically with a driven member to keep a clearance between the deflecting blade and the driven member constant and with high accuracy. CONSTITUTION:Mangetic powder 28 accompained by a driven member 1 in the non-exciting state is checked by slant faces 31a-1'''-31a-6''' of blade portions 31a-1-31a-6, and simultaneously speedily guided and oved from magnetic powder inlet ports 31a-1''-31a-6'' along the slant faces 31a-1'''-31a-6''' into an operation void 27. Deflecting blades 31a, 31b are positioned to a driven member 20 by fitting grooves 32, 32 and disposed concentrically with the driven member 20, so that a clearance 33 formed between the outside diameters of magnetic powder retaining portions 31a-1'-31a-6' and the inner peripheral surface of a drive member 1 is kept highly accurate to prevent magnetic powder 28 guided and moved in the operation void from getting out to the outside voids 29a, 29b. |
