Integrated multifunctional power-assisted gearshift mechanism

The invention discloses an integrated multifunctional power-assisted gearshift mechanism. A central rotary shaft of the integrated multifunctional power-assisted gearshift mechanism is provided with arotary shaft body and a cam installed on the rotary shaft body; a gearshift module comprises an inner gear, a central shell arranged at the middle part of the inner gear, and a plurality of gear assemblies which are slidably nested onto the central shell; the rotary shaft body stretches into an empty cavity of the central shell, the gear assemblies are distributed around the rotary shaft body, and the whole assembly structure is simple and compact, so that realization for miniaturization production is benefited; the cam is capable of being abutted against one end of any gear assembly while rotating, the gear assembly is ejected to the other end to be connected with the inner gear, fixing for a gear is realized, and in this way, switchover for the different gears can be realized by virtueof the rotation of the cam