| 摘要 |
PURPOSE:To prevent a bearing loss during rotation by applying doglegged magnetization, with a convex part in the direction of rotation, to the surface of at least one member, made of ferromagnetic material, of a shaft part or a bearing part and having magnetic fluid retained. CONSTITUTION:Magnetized parts 5a, 5b, magnetized with N and S in a doglegged manner, are alternately provided on the side of the shaft part 5 of a dynamic pressure fluid bearing 4. Ferromagnetic materials such as alnico, plastic magnet and the like are used for the shaft part 5. Further, magnetic fluid 6 is packed between the shaft part 5 and the bearing part 1a and retained by means of the magnetized parts 5a, 5b. This eliminates requirement for seal and grease, and enables reduction of the bearing loss during its rotation. |
