OIL RETURN STRUCTURE FOR FAN

摘要

An oil return structure for fan includes a base, a bearing, a retaining ring and a rotor. The base has a bearing cup internally defining a receiving space for receiving the bearing therein. The bearing has a centered and axially extended shaft hole. The retaining ring is located at a front end of the bearing and has a central hole. The rotor includes a hub and a shaft. The shaft is extended through the central hole of the retaining ring into the shaft hole of the bearing, and is provided with an annular groove corresponding to the retaining ring. Oil in the bearing flowing to the annular groove during fan operation is centrifugally pulled out of the shaft and then caught by the retaining ring, from where the oil returns to the bearing. Therefore, loss of oil from the bearing is largely reduced to ensure extended fan service life.

主权项

1. An oil return structure for fan, comprising:
a base having a bearing cup, which internally defines a receiving space; a bearing being fitted in the receiving space of the bearing cup and provided with a centered and axially extended shaft hole; a retaining ring being located before a front end of the bearing and having a central hole; and a rotor being mounted on the base, and including a hub and a shaft rearward extended from a center of the hub; the shaft being extended through the central hole of the retaining ring into the shaft hole of the bearing, and being provided on an outer surface at a position corresponding to the retaining ring with an annular groove, so that a step is formed at a juncture of the annular groove and the outer surface of the shaft.