Patent ID: 6848830

Claim:
An oil-circulating structure for fan comprising a fan hub with a fan shaft, a fan housing and an oil bearing set in the fan housing, the oil bearing having a central axis hole pivoting with the fan shaft, an inner oil-collecting recess trench being formed in the central axis hole of the oil bearing and having an inner thread shape oil-guiding trench set inside, and an outer oil-collecting recess trench being formed on the outside wall of the bearing, a first radial through hole and a second radial through hole connecting the two ends of the inner thread shape oil-guiding trench with the outer oil-collecting recess trench respectively, when the fan hub rotating, a lubricant in the inner thread shape oil-guiding trench being driven by the rotating fan shaft to flow in-and-out the outer oil-collecting recess trench through the first radial through hole and the second radial through hole so as to perform oil-circulation of the oil bearing.