Fan and motor bearing heat dissipation structure thereof

摘要

A motor bearing heat dissipation structure includes a metal base, a heat conducting element connected to the metal base and including a wall portion and an extended portion, and a plastic bearing cup located around an outer side of the wall portion of the heat conducting element and fixed to the metal base. The plastic bearing cup internally defines a bearing receiving hole. The extended portion is horizontally extended from an upper end of the wall portion toward a center of the plastic bearing cup. A bearing is received in the bearing receiving hole and seated on the extended portion, so that heat produced by the bearing when it rotates along with a rotary shaft of a motor is transferred from the extended portion of the heat conducting element to the metal base for dissipation. A fan using such motor bearing heat dissipation structure is also disclosed.

主权项

1. A motor bearing heat dissipation structure being applied to a bearing having a bottom surface, comprising:
a metal base provided with a through hole; 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; and 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; 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 the bearing being accommodated in the bearing receiving hole and seated on the extended portion with the bottom surface of the bearing being in contact with the top surface of the extended portion; wherein the through hole of the metal base is located below the heat conducting element and the plastic bearing cup, and a space defined in the heat conducting element between an underside of the extended portion and an inner side of the wall portion to communicate with the bearing receiving hole in the plastic bearing cup and the through hole of the metal base.