Patent ID: 8628447

Claim:
A shifting device for a transmission unit of a vehicle, for a vehicle that is driven by muscle force, having a first shaft, which is formed as a hollow shaft, on which a plurality of free gears is mounted, wherein the free gears are in engagement with a corresponding plurality of gearwheels, which are mounted on a second shaft, wherein the second shaft is formed as a through shaft, which is connectable at the ends thereof to cranks for the purpose of driving, wherein the free gears are connectable to the first shaft by means of selecting devices, wherein the selecting devices can be actuated by means of a camshaft arranged coaxially in the first shaft, wherein the camshaft is connected to a driving device in order to be rotated relative to the first shaft to actuate the selecting devices, wherein the driving device has a rotational speed superimposition gear unit, which is arranged coaxially with the first shaft.