Patent ID: 7111988

Claim:
A dustproof structure for a sleeve bearing, comprising: an axial tube having a tubular body, said axial tube engaging a motor stator; a sleeve bearing mounted in the axial tube, the sleeve bearing including an axial hole through which to extend a shaft of a motor rotor; a dustproof cushion received in the axial tube and attached to an end surface of the sleeve bearing for preventing foreign dust from entering into a gap formed between an inner circumference of the axial tube and an outer circumference of the sleeve bearing, the dustproof cushion including an axial hole through which to extend the shaft of the motor rotor, said dustproof cushion further including an annular wall that projects upwardly from an inner periphery of the axial hole; and at least one oil returning groove formed on a surface of the dustproof cushion facing the end surface of the sleeve bearing and adapted to re-lubricate an inner circumference of the axial hole of the sleeve bearing.