| 主权项 |
1. A magnetic fluid sealed bearing, comprising:
an inner ring and an outer ring formed of a magnetic material; a plurality of rolling members disposed between the inner ring and the outer ring; a ring-shaped polar plate formed of a magnetic material, the ring-shaped polar plate being mounted on an inner circumferential surface of the outer ring such that a gap is produced between the ring-shaped polar plate and an outer circumferential surface of the inner ring; a ring-shaped magnet attached to an axially inner side surface of the ring-shaped polar plate, the ring-shaped magnet being magnetized such that magnetic poles thereof point to axial directions so as to form magnetic circuits on both the outer ring side and the inner ring side, the ring-shaped magnet having a smaller radial length than the ring-shaped polar plate; and an inner ring magnetic fluid for sealing the gap, the inner ring magnetic fluid being retained in the magnetic circuit formed on the inner ring side, wherein the ring-shaped polar plate includes a constraining portion for positioning and fixing the ring-shaped magnet, the constraining portion being configured to constrain the ring-shaped magnet from moving in an axial direction and a radial direction. |
