| 摘要 |
A shifting device for a transmission unit, in particular for a vehicle which is operated by muscle force is disclosed. The shifting device has a first partial transmission and a second partial transmission, which are connected in series for power transmission. The first partial transmission has a shaft, which is formed as a hollow shaft and on which a plurality of loose wheels is mounted which form a corresponding plurality of gearwheels wheel pairs of the first partial transmission. The loose wheels can be connected to the shaft by means of selecting devices in order to form different gear stages of the first partial transmission, wherein the selecting devices can be actuated by a camshaft arranged in the shaft. The selecting devices of the first partial transmission are designed as selectable free-running clutches and the second partial transmission has a plurality of selectable gear stages. The camshaft is designed such that, during shifting from a highest stage of the gear stages of the first partial transmission to a lowest stage of the gear stages of the first partial transmission, the free-running clutches of the two gear stages are actuated simultaneously, and a load change between the corresponding free-running clutches allows a shifting operation of the second partial transmission to a higher stage of the gear stages. |
