Motors with oil dynamic pressure bearing, oil dynamic pressure bearing devices and method for manufacturing the same
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United States of America Patent
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Jun 13, 2006
Grant Date -
Jan 22, 2004
app pub date -
May 15, 2003
filing date -
May 17, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A motor with fluid dynamic pressure bearing is disclosed. The motor includes a dynamic pressure bearing member having a concave section that is concave in an axial direction, a rotary shaft that is rotatively supported by the dynamic pressure bearing, and a rotary member that is joined to the rotary shaft in one piece along a joint section between the rotary member and the rotary shaft, and rotatively driven by electromagnetic drive force, an expanded diameter section that is provided on the dynamic pressure bearing member. A fallout preventing member is provided on the rotary member, which overlaps the expanded diameter section of the dynamic pressure bearing member in the axial direction to prevent the rotary shaft from falling out of the dynamic pressure bearing member. The concave section of the rotary member opposes in the axial direction the expanded diameter section of the dynamic pressure bearing member, wherein the expanded diameter section is placed inside the concave section, and the joining section between the rotary member and the rotary shaft overlaps the expanded diameter section in the radial direction.
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