Power transmission apparatus capable of measuring torque and power generation apparatus using the same

A power transmission apparatus capable of measuring torque, comprising:

• an outer body that receives power from outside, the outer body being formed in a teeth shape along an outer circumference surface of the outer body to receive the power from outside and including a space, wherein the space is formed through an inner portion of the outer body and formed as a pair of opposing spatial portions, each spatial portion being defined by an arc of the outer body and two flat surfaces that emanate from the outer body toward a middle portion of the outer body;
• an inner body that is received within the outer body, the inner body including two flat surfaces, each being disposed in a respective spatial portion of the space, wherein each flat surface of the inner body is substantially parallel with a respective flat surface of the flat surfaces that emanate from the outer body;
• and
• two load cells disposed between the flat surfaces of the inner body and the flat surfaces that emanate from the outer body, each load cell directly abutting one of the flat surfaces of the inner body and one of the flat surfaces that emanate from the outer body so that the inner body and the outer body are connected only by the load cells,
• wherein the inner body is formed so that an outer perimeter surface of the inner body is spaced apart from an inside of the space, and
• wherein the two load cells receive a compression force and a tension force from the outer body and the inner body.