| 摘要 |
A variable ratio transmission having a variable sprocket, particularly suitable for bicycle transmission, said variable sprocket comprising a drive flange and an indexing flange mounted on an axle with a pair of sprocketsegment-planets and at least two idler-planets sandwiched between said flanges forming a relatively rigid variable sprocket, the planets adapted to expand and contract in response to a relative rotation of the flanges and thereby change the effective diameter of the variable sprocket. |
