Bicycle crank assembly

The utility model discloses a bicycle crank assembly which comprises a crank, a fixing assembly and a rotating shaft. One ends of the two groups of cranks are fixedly mounted at two ends of the rotating shaft; the rotating shaft comprises a first spline shaft and a second spline shaft, the two cranks are connected to the first spline shaft and the second spline shaft in a sleeving mode respectively, and the cranks and the first spline shaft are fixedly connected through fixing assemblies. The rotating shaft is provided with a hollow inner cavity, and at least one reinforcing rib is arranged on the inner wall face of the hollow inner cavity. The reinforcing ribs reduce the weight of the rotating shaft and improve the rigidity at the same time. 本实用新型公开了一种自行车曲柄组件，包括：曲柄、固定组件和转轴；两组曲柄的一端安装固定在转轴两端、曲柄另一端安装有踏板组件；转轴包括第一花键轴和第二花键轴，两组曲柄分别套接在第一花键轴和第二花键轴上、用固定组件紧固连接曲柄和第一花键轴；转轴具有一中空内腔，中空内腔内壁面设有至少一个加强筋。加强筋减轻了转轴重量的同时提高了刚性。