Integrated transmission gear shifting mechanism and gear shifting system

The utility model discloses an integrated transmission gear shifting mechanism and a gear shifting system. The integrated transmission gear shifting mechanism comprises a gear shifting motor for power input, a gear shifting hub assembly for pushing a gear shifting fork assembly to achieve gear shifting, a first-level planet row reducing mechanism located between the gear shifting motor and the gear shifting hub assembly to achieve force transmission, and the gear shifting fork assembly matched with the gear shifting hub assembly. Compared with a traditional complex two-stage planet row speed reducing mechanism, the first-stage planet row speed reducing mechanism has the advantages that the single planet carrier, the single sun gear, the left planet gear and the right planet gear are of an integrated structure; the right planet wheel replaces a right sun wheel with weak strength to transmit torque, and the gear shifting mechanism is simple and compact in structure and higher in torque bearing capacity. The uti