Patent ID: 7364403

Claim:
A lubricating system for a fan comprising: a lubricant storage space formed at an end portion of the fan for receiving lubricant in the lubricant storage space; a lubricant temporary retaining space defined at another end portion of the fan for temporarily retaining the lubricant in the lubricant temporary retaining space; and a lubricant returning space communicating the lubricant storage space with the lubricant temporary retaining space, the lubricant flowing from the lubricant storage space through a gap between a bearing and a shaft of the fan to reach the lubricant temporary retaining space, and flowing from the lubricant temporary retaining space back to the lubricant storage space via the lubricant returning space when the fan is operated, wherein the lubricant returning space is defined in a tube of the fan, the tube being made of plastic with the bearing mounted therein, and a stator mounted around the tube; wherein the lubricant temporary retaining space is enclosed by an outer surface of a top end of the shaft and an inner surface of an annular wall extending from a hub, the annular wall radially spaced from and surrounding the top end of the shaft, the top end of the shaft being secured to the hub, and a bottom end of the shaft being rotatably mounted in a bearing hole of the bearing, the hub having fan blades formed at an outer periphery wall thereof.