Novel variable speed flower -drum in bicycle

The utility model discloses a novel variable speed flower -drum in bicycle, including flower -drum main part supporting mechanism, power input mechanism, planetary gear mechanism of first group, middle power transmission mechanism, planetary gear mechanism of second group, power take off mechanism and axis speed change mechanism. The utility model discloses having retrencied the structure of interior variable speed flower -drum, having increased the interior gear that changes speed the flower -drum, alleviateed the weight of interior variable speed flower -drum, matchd with the action of executive module through setting up manipulation variable speed multiple mounted cam, more simple and convenient accuracy is operated in shifting of bicycle, simultaneously the utility model discloses the bicycle of different styles can be be suitable for, the practicality of interior derailleur effectively improved. 本实用新型公开了种新型自行车内变速花鼓，包括花鼓主体支撑机构、动力输入机构、第组行星齿轮机构、中间动力传动机构、第二组行星齿轮机构、动力输出机构以及中轴变速机构。本实用新型精简了内变速花鼓的结构，增加了内变速花鼓的档位，