Bearing structure

A bearing structure, comprising:

• a base unit, including a base, a surrounding wall coupled to the base, a bottom wall connected to the bottom of the surrounding wall, and a cavity defined by the surrounding wall and the bottom wall;
• a rotating unit, including a rotating shaft arranged in the cavity;
• and
• a first lubricating unit, including a first bearing arranged in the cavity and connected with the bottom wall, and a carbon-containing pad arranged on the upper surface of the first bearing, the carbon-containing pad being made of graphite, the bottom end of the rotating shaft pressing against the upper surface of the carbon-containing pad, the upper surface of the first bearing featuring an upward protruding substantially dome-shaped profile;
• wherein the thickness of the carbon-containing pad is greater than 0.3 mm, the bottom end of the rotating shaft features a downward protruding dome-shaped profile, the upper surface of the carbon-containing pad exhibits an upward protruding dome-shaped profile, and the lower surface of the carbon-containing pad is designed to mate with the upper surface of the first bearing, allowing the carbon-containing pad to be securely coupled to the first bearing.