| 摘要 |
A cooling fan has a housing. A stator is securely mounted in the housing and has a coil, an upper pole sheet and a lower pole sheet coaxially provided at a top and a bottom of the coil respectively. A circuit board is provided beneath the lower pole sheet. An oil-retaining bearing is mounted in the stator. A rotator is received in the housing and has a cap covering the stator. A spindle is formed at the center of the cap and inserted through the oil-retaining bearing. A dustproof disk is provided between the circuit board and the lower pole sheet and is received in the cap of the rotator. A gap between the circuit board and the cap is sealed by the dustproof disk, and dust will not enter into the rotator to block the oil-retaining bearing.
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