Patent ID: 7819586
Filing Date: 2010-10-26
Classification: F16C

Abstract:
1. A fan with an anti-leakage device comprising: a base; an axial barrel extending from the base, providing a first end and a second end and providing a first oil storage groove at the second end for containing a lubricant; a fan wheel providing a joining member, wherein the joining member has an inner annular recess surrounding the center of the fan wheel, and an outer cylinder surrounds the inner annular recess and extends into the axial barrel via the inner side of the first end; a spindle extending from the center of the fan wheel to the bottom of the first oil storage groove; a bearing with an axial through bore being received in the axial barrel and disposed between the outer cylinder and the first oil storage groove, the axial through bore being passed by and fitting with the spindle, the axial through bore having two opposite cone-shaped ends and at least a second oil storage groove at a wall surface thereof, wherein one of the cone-shaped ends is disposed next to the first oil storage groove and the other one of the cone-shaped ends is disposed next to the outer cylinder, and the second oil storage groove extends from the cone-shaped end next to the first oil storage groove for receiving the lubricant from the first oil storage groove; whereby, when the spindle rotates with respect to the bearing, the lubricant moves outward from the first oil storage groove along the spindle, most of the lubricant stays in the second oil storage groove to prevent a phenomenon of dry friction between the spindle and the wall surface of the axial bore; only a small amount of the lubricant moves outward the cone-shaped ends, the lubricant moving outward the cone-shaped end next to the outer cylinder is stopped by the outer cylinder and the annular recess and flows back to the first oil storage groove along the outer surface of the bearing, and the lubricant moving outward the cone-shaped end next to the first oil storage groove flows back to the first oil storage groove directly.