| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent, in a fluid dnamic pressure bearing device in which axial thrust is applied to a shaft member during rotation of the shaft member, the contact of a flange of the shaft member with a member facing it even in high-speed rotation. <P>SOLUTION: When a downward thrust F is applied to the shaft member 2 during rotation of the shaft member 2, support force F2 of a second thrust bearing portion T2 which supports the flange 2b of the shaft member 2 downward is set smaller than the support force F1 of a first thrust bearing portion T1 which supports the flange 2b of the shaft member 2 upward. <P>COPYRIGHT: (C)2013,JPO&INPIT |
