| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate a defect that it is necessary to magnetize a portion near a seal of a rotating part or a sealing part when sealing the rotating part or the sealing part with the usage of a magnetic fluid, high-grade processing technique is required to selectively and partially magnetize the portion near the seal of the rotating part or the sealing part, at the same time, the magnetic fluid is scattered at high speed rotation of a bearing device or oil or grease comprising the magnetic fluid leaks by change with the lapse of time even in the stationary sealing part when not being partially magnetized, and to eliminate a defect that structurally an opening is formed and sealing is broken when a gap is larger than being covered by elasticity or flexibility of a seal ring. <P>SOLUTION: In the seal ring for the magnetic fluid, a ring comprising a magnetic material and a ring comprising a non-magnetic material are incorporated, or the non-magnetic material including fine particles comprising the magnetic material is molded in a ring-shape. <P>COPYRIGHT: (C)2009,JPO&INPIT |
