Patent ID: 8016559

Claim:
A cooling fan, comprising: a bracket; a stator fixedly mounted in said bracket, said stator comprising an outer sleeve and an inner sleeve concentrically suspending inside said outer sleeve, said inner sleeve having a middle part fixedly connected to a middle part of said outer sleeve and a plurality of crevices equiangularly spaced around the periphery of a top end thereof; an axle bearing inserted into said inner sleeve of said stator, said axle bearing being a tubular member having a top open end, a bottom close end opposite to said top open end, a plurality of top hook blocks and bottom hook blocks protruded from the periphery and respectively spaced around said top open end and said bottom close end and respectively hooked on top and bottom ends of said outer sleeve of said stator, a bottom center through hole cut through the center of said bottom close end, and a plurality of crevices radially extending from said bottom center through hole; a steel ball rotatably supported on said bottom close end inside said axle bearing; and a fan blade, said fan blade having a center axle inserted into said axle bearing and stopped against said steel ball.