| 摘要 |
The present invention relates to a new structure of a chain transmission which is configured to improve durability of a chain and has a simple structure. According to the present invention, the chain transmission shifts a driving force or the rotational speed of a driving device connected to a first sprocket (20) in accordance with a ratio of the diameter of the first sprocket (20) to the diameter of a second sprocket (30), and a length of a returning unit (62) where a load is not applied is significantly elongated as compared with an extension unit (61) where a load is applied while an area covered by the chain transmission is not increased as compared with an existing transmission, so overall durability of the chain (60) is increased. |
