| 摘要 |
PURPOSE:To inhibit the vibration of a rolling element (a ball, etc.) of a rolling bearing, and to secure a height position accuracy of a rotor by using both the rolling bearing and a non-contact type bearing such as a fluid pressure bearing, etc., for a bearing part, and operating a rotor magnet attracting force of a direct-coupled motor, in the thrust direction. CONSTITUTION:A bearing part for supporting a rotary structure body 3 is constituted of a rolling bearing 80 and fluid dynamic pressure bearing parts 2, 21. On the surface of an axis 1, a chevron-shaped shallow groove 2-1 is formed, and on the other hand, in the thrust supporting part 21, a spiral shallow groove 21-2 or a herringbone loop 21-1 of almost the same as a journal supporting part is formed on the upper end face of a thrust receiving piece 20. In these fluid dynamic pressure bearings, a lubricating fluid 100 flows at a high speed in each group by a rotation, therefore, a dynamic pressure is generated, and the rotary structure body 3 is supported by non-contact to the axis 1.
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