Patent ID: 7052254

Claim:
An oil lubricant retaining bearing structure for retaining a lubricant lubricating a fan in a fan housing, the oily bearing structure comprising: an oily bearing having: a) a central axis hole, a fan shaft of the fan being rotatably inserted into the central axis hole; and b) an internal-recycle oil-retaining system having: i) an oil collection trench formed around an interior surface of the central axis hole; ii) an acute angle oil-guiding ring edge located on each of two opposing ends of the oil collection trench; and iii) two round inner recess trenches, one of the two round inner recess trenches being formed on each of two opposing ends of the oil collection trench adjacent to each acute angle oil-guiding ring edge, wherein the internal-recycle oil-retaining system providing a reservoir for the lubricant.