Rear-mounted automatic transmission for tricycle

The utility model discloses a rear-mounted automatic transmission for a tricycle, and relates to the field of tricycles. According to the technical scheme, the gearbox comprises a speed change mechanism, a differential mechanism and a transmission mechanism. The transmission mechanism comprises a forward spline shaft, a forward input gear, a forward output gear, a forward sliding sleeve, a reverse spline shaft, a reverse input gear, a reverse output gear, a reverse sliding sleeve and a reversing execution assembly. Wherein the forward input gear is meshed with the reverse input gear, and the forward input gear is connected with the speed change mechanism; the forward output gear and the reverse output gear are connected with the differential mechanism, the reverse output gear idles during forward work, and the forward output gear idles during reverse work. The electric bicycle has the advantages of being simple and compact in structure and capable of optimizing riding experience. 本实用新型公开了一种三轮车用后置自动变速器，其涉及三轮车领