Heat dissipation fan

A heat dissipation fan comprising:

• a casing;
• a stator fixedly received in said casing;
• a sleeve with a central hole securely attached to said stator and an inclined flange surrounding said central hole and extended from a top end of said sleeve central hole with at least one recess defined in said flange;
• a lubricating bearing with lubrication oil contained therein and mounted in said sleeve, with a top end of said lubricating bearing abutting said sleeve flange and an annular space being defined between said bearing and said sleeve flange;
• a fan rotatably mounted in said casing and having a permanent magnet mounted therein to be a rotor;
• a shaft extending from said fan and securely received in said central hole of said lubricating bearing;
• and
• a locking disk securely mounted on a free end of said shaft to lock said lubricating bearing on said shaft;
• wherein said lubricating bearing has a central hole defined therein, a chamber defined in a bottom end of said bearing and at least one oil groove longitudinally defined on the outer periphery of said bearing so as to provide a guide and storing effect to the lubrication oil.