| 摘要 |
PURPOSE: To obtain a bearing device which lessens noise and vibration and has a long life by adopting a structure to confine magnetic lubricating fluid by a magnetic circuit formed between a pair of bearing pats magnetized in directions opposite to each other. CONSTITUTION: The bearing part 14a and the bearing part 14b are respectively formed by the inner side of the bearing 14 provided with a permanent magnet 15a and the inner side of the bearing 14 provided with a permanent magnet 15b. Since the permanent magnet 15a and the permanent magnet 15b are magnetized in the directions opposite to each other, the magnetic lines of force emitted from the permanent magnet 15b pass the bearing part 14b of the bearing 14 and infiltrate the inside of the bearing 14, by which the magnetic circuit entering the permanent magnet 15a from the upper bearing part 14a is formed. Since magnetic fluxes are congested by formation of the magnetic circuit on the surfaces of the bearing part 14a and the bearing part 14b to a shaft 5, the magnetic lubricating fluid 16 is sucked and held in the bearing part 14a and the bearing part 14b. The magnetic lubricating fluid 16 is confined by the magnetic circuit in such a manner. |
