Spindle motor with seal structure
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United States of America Patent
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-
Jan 21, 1997
Grant Date -
N/A
app pub date -
Feb 17, 1994
filing date -
Feb 22, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spindle motor comprises a stationary shaft, a rotor hub rotatably mounted by ball bearings to the stationary shaft, and annular sealing members disposed between the outer surface of the stationary shaft and the inner side of the rotor hub axially outwardly of the ball bearings. The sealing member is directly fitted onto the outer race of the corresponding ball bearing. The outer race of each ball bearing is high precision finished so that the sealing member is definitely coaxial with the stationary shaft regardless of the finishing accuracy on the inner side of the rotor hub. Accordingly, the radial distance between the inner side of the sealing member and the outer surface of the stationary shaft can be minimized with high precision offering an excellent labyrinth effect.
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