| 摘要 |
PURPOSE: A power transmission device for a bicycle is provided to drive a long distance by easily changing a general bicycle to an electric bicycle. CONSTITUTION: A power transmission device for a bicycle comprises an installation case(10), a body(20), a battery part(30), a fixing and coupling part, a fixed bracket(50), a fixing unit(60), an installation bracket(70), and a driving part(80). The installation case is installed between a frame(5) and a saddle(7). The body is inserted into the installation case and comprises a moving space part. A second fixed hole is connected to the moving space part. A connection part is formed in the front side of the battery part, and a terminal connection hole to which a terminal of the body is connected is formed in the rear side thereof. The battery part is installed inside the installation case. The fixing and coupling part comprises a fixing holder coupled to a seat post in the moving space part of the body; and a fixing clamp for fixing the body to the seat post. The fixed bracket comprises a first plate coupled to the rear side of the body; and second plates protruded from both ends of the first plate. The fixing unit comprises a shaft having a fitting hole; a spring positioned between the second plates of the fixed bracket; and a pin fitted in the fitting hole of the shaft to receive the elasticity of a spring. |
