Brushless direct current fan
A fan includes a frame (10), a stator (22), an impeller (40), and an oil retainer (70). The frame includes a sleeve (14) having a bearing (20) secured therein. The stator surrounds the sleeve, and the impeller surrounds the stator. The impeller includes inner and outer rings (46, 45). The oil retainer includes a large cylinder (72) fittingly received between the rings to form a seal between the large cylinder and the outer ring, and a small cylinder (74) received in the stator. A sealed chamber (49) is thus defined between the large cylinder and the impeller. A shaft (48) is fixedly secured in the impeller, and extends through the oil retainer and the bearing. A gap (50) is defined between the shaft and the small cylinder. In operation, lubricating oil originating from the bearing passes through the gap to the sealed chamber, and flows back to the bearing.
Hon Hai Precision Ind. Co., Ltd.
F H H F F
F04D H02K H02K F16C F16C
inventional inventional inventional inventional inventional
Yu-Cheng Chin-Hung
Chou Chang