Patent ID: 8608610

Claim:
A shifting device for a transmission unit of a vehicle operated by muscle force, having a first shaft on which a plurality of idler gears is mounted, a corresponding number of gearwheels, wherein the idler gears and the gearwheels form wheel pairs of two partial transmissions connected in series to each other, wherein the gearwheels of each of the two partial transmissions are mounted on one respective shaft, wherein a shifting assembly is associated to each of the idler gears and wherein the idler gears can each be connected rotationally fixed to the first shaft by means of the respective shifting assembly, wherein the first shaft is formed as a hollow shaft having two shifting pins each assigned to the shifting assemblies of one of the two partial transmissions, wherein the shifting pins are arranged coaxially on the inside of the hollow shaft, wherein the shifting pins have actuation portions by means of which the shifting assemblies can be actuated and wherein the actuation portions are connected rotationally fixed to the shifting pin, wherein the shifting pins are each connected to a driving device which is configured to rotate the shifting pins in order to actuate the respective shifting assemblies of the two partial transmissions independently, wherein the driving device is configured to rotate the corresponding shifting pin and the connected actuation portions by means of a planetary gear mechanism synchronously with respect to the first shaft in order to maintain a shifted state of the shifting assemblies and to rotate the shifting pin in relation to the first shaft in order to carry out a gear change, wherein the shifting assemblies are formed as shiftable freewheels, and wherein the actuation portions are arranged on the shifting pin in such a way that the freewheels of two successive gear stages can be actuated simultaneously.