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(11) | EP 2 302 217 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Bearing cooling structure of heat dissipating fan |
| (57) A non-contact dust-proof structure of a heat dissipating fan includes a stator and
a rotor. A bearing is fixed in an axial hole of a shaft of the stator. The rotor has
an axle which is inserted in the bearing. The rotor further comprises an axle base
disposed at a distal end of the axle. The axle base is inserted in the axial hole
of the shaft. A gap is defined between an outer surface of the axle base and an inner
surface of the axial hole. The outer surface of the axle base is formed with a plurality
of air guiding grooves adapted to exhaust the air in the bearing. The air guiding
grooves are spiral grooves or V-like grooves. When the rotor is turned at a high speed,
the air guiding grooves will form an exhaust effect, achieving a non-contact dust-proof
protection structure to block external dust or water from entering the bearing in
the axial hole, so that the running of the bearing won't be influenced. The present
invention ensures that the heat dissipating fan has a better function and a longer
service life.
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