Reversing box assembly with high-speed and low-speed functions

The invention discloses a reversing box assembly with high and low speed functions, which comprises a box body, an input shaft, an intermediate shaft and an output shaft are arranged in the box body, a transmission device is arranged between the input shaft and the intermediate shaft, and a low-speed constant mesh gear and a high-speed constant mesh gear are arranged on the intermediate shaft. The output shaft is sleeved with a low-speed gear shifting gear and a high-speed gear shifting gear in a clearance mode, a meshing seat is installed on the output shaft, and a meshing sleeve is installed on the meshing seat. An operating device is also mounted in the box body; by the adoption of the reversing box assembly, the functions of power transmission and reversing between a clutch assembly and a gearbox assembly in a three-wheel automobile with a single-cylinder engine as power and matched with transmission of a transmission shaft are achieved, the maximum length of the three-wheel automobile with the single-cyl