Patent ID: 6567268
Filing Date: 2003-05-20
Classification: F16C,H02K

Abstract:
A cooling fan with magnetic liquid, comprising:a housing (10) with a chamber (11) defined therein, the housing (10) having a seat (12) provided at a bottom of the chamber (11), a sleeve (13) which is made of non-magnetized material formed on the seat (12), a self-lubricating bearing (15) received in the sleeve (13), a magnetic ring (14) provided at a top of the sleeve (13), lubricant (151) received between the bearing (15) and the magnetic ring (14); a circuit board (20) provided on the seat (20) and outside the sleeve (13); a coil (30) provided on the circuit board (20) and outside the sleeve (13); and a rotor (40) rotatably mounted on the sleeve (13), the rotor (40) having a hollow body (41) covering the coil (30) and the circuit board (20), a spindle (42) formed at a center of the hollow body (41) and extending through the magnetic ring (14) and in the bearing (15), a gap (43) defined between the magnetic ring (14) and the spindle (42), magnetic liquid (44) received in the gap (43) for preventing the lubricant (151) from escaping from between the bearing (15) and the magnetic ring (14).