Bearing structure for radiating fans

A bearing structure for a rotor shaft of a radiating fan, comprising:

• a frame unit including a hollow post surrounded by a stator and, positioned within the hollow post, a bearing for said rotor shaft,
• a fan unit mounted on said frame unit and arranged to support a ring-shaped rotor magnet that surrounds said stator, said rotor shaft being affixed to said fan unit so as to extend from said fan unit into said bearing through an opening at a top of said bearing,
• wherein said fan unit is driven to rotate continuously by magnetic field induction produced by interaction between said stator and said ring-shaped magnet,
• wherein an inside wall of said bearing has formed therein at least one groove extending circumferentially around said inside wall and arranged to contain a lubricating oil for said bearing and thereby increase an oil containing capacity of the bearing structure for facilitating said rotation of the fan unit, and
• wherein said bearing is suspended in said hollow post such that a chamber is formed below said bearing, said chamber being surrounded by:
• i) said hollow post;
• ii) a lower end of said bearing;
• and
• iii) an oil cap through which said lubricating oil is introduced into said chamber.