| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor of a bearing structure for suppressing occurrence of a pressure difference between an upper seal section and a lower seal section. <P>SOLUTION: The motor includes a static section and a rotation section 3. The static section includes a shaft section 41 and an outer cylinder section 432. The rotation section 3 includes an inner cylinder section 51, an upper annular section 47, and a lower hub annular section 54. An upper seal section is constituted between the shaft section 41 and an upper part of the upper annular section 47, and a first gap in which a radial dynamic pressure bearing section exists is constituted between the shaft section 41, and the upper annular section 47 and the inner cylinder section 51. A second gap is constituted between the inner cylinder section 51 and the outer cylinder section 432. A third gap where a thrust dynamic pressure bearing section exists is constituted between a lower face of the upper annular section 47 and an upper face of the outer cylinder section 432. A lower seal section is constituted between the outer cylinder section 432 and the lower hub annular section 54. The upper annular section 47 includes a communication route 61 communicating a region on the radial outside of the thrust dynamic pressure bearing section of the third gap and a region between the upper seal section and the radial dynamic pressure bearing section. <P>COPYRIGHT: (C)2013,JPO&INPIT |
