Fan and motor bearing heat dissipation structure thereof

A fan, comprising:

• a metal base;
• a heat conducting element including a wall portion fixedly connected at a lower end to the metal base and an extended portion horizontally formed on an upper end of the wall portion;
• and the extended portion having a free end and a top surface;
• a plastic bearing cup including a lower portion, which encloses the wall portion of the heat conducting element therein and is fixed to the metal base;
• the plastic bearing cup upward extending from the lower portion and having an upper end located higher than the wall portion;
• the plastic bearing cup having an inner wall surface and internally defining a bearing receiving hole, which extends from the upper end of the plastic bearing cup into the lower portion thereof;
• a stator assembly being fitted on around an outer side of the plastic bearing cup;
• a bearing being received in the bearing receiving hole of the plastic bearing cup, and having a central bore and a bottom surface;
• a rotor assembly being correspondingly located around the stator assembly and including a rotary shaft, which extends through the central bore of the bearing;
• wherein the extended portion of the heat conducting element is extended from the upper end of the wall portion to horizontally radially inward project beyond the inner wall surface of the plastic bearing cup toward a center thereof, so that both the free end and the top surface of the extended portion are located in the bearing receiving hole;
• and
• wherein the bearing is seated on the extended portion with the bottom surface thereof being in contact with the top surface of the extended portion.