| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor capable of reducing a pressure difference between upper and lower sealing parts to prevent lubrication oil from being leaked with ease. <P>SOLUTION: In a motor, a dynamic pressure bearing is configured in a first gap between a shaft part 41 and a sleeve part 5, and an upper sealing part extending upward and a lower sealing part extending downward are configured to radial direction outside the dynamic pressure bearing. Interfaces of lubrication oil locate to the upper sealing part and the lower sealing part respectively. The upper sealing part and the lower sealing part are communicated with each other via a communication hole 61. A region from the upper sealing part to the lower sealing part via the first gap, and the communication hole 61 are filled with the lubrication oil 45. A distance in an axial direction between the interface of the upper sealing part and the interface of the lower sealing part is smaller than a distance in the axial direction between an upper end and a lower end of the dynamic pressure bearing. <P>COPYRIGHT: (C)2013,JPO&INPIT |
