| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil dynamic pressure bearing motor capable of sufficiently ensuring joint length of a rotation shaft and a rotation member, thickness of a dropping off prevention member, length of a capillary tube seal part and length of a joint part of a dynamic pressure bearing member and a base plate. SOLUTION: The oil dynamic pressure bearing motor is provided with the rotation member 20 fitted onto a peripheral surface of the rotation shaft 16 and integrally rotated/driven with the rotation shaft; a diameter enlarged part 28 formed on the dynamic bearing member 14; the dropping off prevention member provided on the rotation member 20 and preventing dropping off of the rotation shaft 16 by axially overlapping with the diameter enlarged part 28 of the dynamic pressure bearing member 14; and a seal part 32 axially extending from the outside of an axial opposed surface of the dropping off prevention member and the diameter enlarged part 28 and inhibiting flowing out of a lubrication oil 18 to the outside. An axial recessed part 38 is formed on an opposed part of the rotation member 20 to at least the diameter enlarged part 28 and the diameter enlarged part 28 is arranged in the recessed part 38. The joint part 36 of the rotation member 20 and the rotation shaft 16 and the diameter enlarged part 28 are radially overlapped. COPYRIGHT: (C)2004,JPO
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