Patent ID: 7296801

Claim:
An anti-leakage device of lubrication oil for a fan, comprising: a hub seat; a sleeve, being fixedly attached to the center of the hub seat and providing a heat end; a durable pad, being circular and disposed inside the sleeve; an engaging piece, being circular and disposed inside the sleeve above the durable pad; a bearing, being disposed inside the sleeve to sit on the engaging piece; a shaft, providing a first end being inserted into the sleeve fitting with the bearing and having a neck part next to the end engaging with the engaging piece; and a hub, being joined to a second end of the shaft and having a central annular recess surrounding the shaft to fitting with the head end of the sleeve; characterized in that the sleeve, which has a lower section with an inner diameter being less than rest part thereof, fits with the durable pad, which is placed at the bottom of the sleeve, a middle section with an inner diameter being greater than the lower section to form a shoulder between the lower section and the middle section for being sit with the engaging piece sitting on the shoulder and fitting with the middle section and allowing the bearing being disposed next to the shoulder to form an oil storage part between the outer circumference of the bearing and the inner wall of the middle part for the shaft passing through the bearing and the engaging piece with first end of the shaft being received in the lower section and touching the durable pad.