Two-stage speed change main reducer assembly for shifting fork limiting

The utility model provides a two-stage speed change main reducer assembly for shifting fork limiting. The two-stage speed change main reducer assembly for shifting fork limiting comprises an input shaft, and the inner side end of a case body which the input shaft penetrates is provided with a bevel gear wheel; the bevel gear wheel is engaged with driving and driven gears, the driving and driven gears are fixedly arranged on a driven shaft, a gear hub and a gear sleeve are fixedly arranged on the driven shaft, the gear sleeve can shift left and right driven by a shifting fork, the tail end of the shifting fork stirs the gear sleeve to shift, and the other end of the shifting fork is fixed on the a shifting fork shaft through a shaft pin; the shifting fork shaft penetrates out of the case body, the tail end of the shifting fork shaft is connected with a gear shift arm in a hinged mode, and the middle of the gear shift arm is connected with a gear shift arm support in a hinged mode. The shifting fork is arranged in a shifting fork hole, the shifting fork hole is in the shape of an oval, a location hole is formed in the side edge of the shifting fork hole, a location pin is arranged in the location hole, and the root of the location pin is provided with a spring. The gear shift arm can be pulled to rotate around the support hinge joint point and drive the shifting fork shaft to shift left and right to stir the gear sleeve to shift.