Door hinge

A door hinge that can connect a door and a door frame and capable of opening the door, comprising:

• a housing fixedly installed on the door frame;
• a cam fitted to the housing and coupled to the door and a hinge shaft configured to eccentrically rotate about hinge shaft 90 according to an opening operation of the door;
• a roller in contact with the outer curved portion of the cam and being pushed backward according to the eccentric rotation operation of the cam;
• a damper case connected to the roller by a pin and configured to linearly move to a backward according to the pushing pressure of the roller;
• a chamber formed recessedly at the end of the damper case
• a damper cover fixedly installed on the housing with a fastening pin and having an accommodating space for slidably inserting the guide tube;
• a damper installed in the accommodating space of the damper cover;
• a rod configured to exert a compressive force of the damper in the process of contacting with a wall surface of the chamber according to a backward movement of the damper case while being located in the chamber of the damper case after passing through the guide tube;
• and
• a main spring inserted between the damper case and the damper cover and configured to exert a compressive force according to the backward movement of the damper case.