Integrated type two-stage speed change main reduction assembly with single shifting fork

The invention provides an integrated type two-stage speed change main reduction assembly with a single shifting fork. The integrated type two-stage speed change main reduction assembly with the single shifting fork comprises a shell; the shell is provided with an input shaft and an angle gear shaft and further provided with an intermediate shaft parallel to the center line of the input shaft; the input shaft is hollowly sleeved with a first drive gear; the end, close to the input shaft, of the angle gear shaft is fixedly sleeved with a second drive gear; the intermediate shaft is fixedly sleeved with a first intermediate gear and a second intermediate gear; the first intermediate gear and the second intermediate gear are engaged with the first drive gear and the second drive gear respectively; the input shaft is in key connection with a clutch capable of being combined with the first drive gear or the second drive gear; the clutch is provided with the shifting fork with a shifting fork shaft; the shifting fork shaft is provided with three grooves; a shifting fork shaft control mechanism positioned on the shell is arranged on the lateral side of the shifting fork shaft. Two speed change gears are additionally arranged on a main speed reducer, the traveling capacity when a vehicle is overloaded, climbs a slope and starts is improved, the load capacity of the vehicle is improved obviously, the product strength is improved obviously, and the production cost is reduced.