Cam hydraulic door closer for narrow frame door

A cam hydraulic door closer for a narrow frame door, which is adapted for a connection of a door body with a door frame, the cam hydraulic door closer comprising:

• a door closer main body, the door closer main body being embedded in a corner of the door body and flush with the door body;
• a horizontal fastener, an end of the horizontal fastener being fixed flush with a top surface of the door closer main body, another end of the horizontal fastener extending in a horizontal direction and being fixed flush with a horizontal side of the door body;
• a vertical fastener, an end of the vertical fastener being fixed flush with a bottom surface of the door closer main body, another end of the vertical fastener extending in a vertical direction and being flush with a left end surface of the door closer main body, and said another end of the vertical fastener being fixed flush with a vertical side of the door body;
• and
• an eccentric cam shaft, an axial direction of the eccentric cam shaft being perpendicular to an extending direction of the door closer main body, and an end of the eccentric cam shaft being fixedly connected with the door frame, another end of the eccentric cam shaft being rotatably pivoted in the door closer main body.