Axial lengthening type speed reducer

The utility model discloses an axial lengthening type speed reducer. The connecting device comprises a reduction gearbox, a connecting transmission part and a connecting body, wherein the reduction gearbox comprises a first gear box and a second gear box which are arranged in parallel at an interval, and the first gear box and the second gear box are respectively provided with an input shaft and an output shaft of which the axial leads are arranged in parallel at an interval; the connecting transmission part is connected between the first gear box output shaft and the second gear box input shaft; the connecting body is connected between the first gear box and the second gear box, and an input shaft of the first gear box and an output shaft of the second gear box are coaxially arranged; when long-span connection with external equipment is carried out, a connecting shaft is not needed for transition, equipment vibration can be reduced, and transmission stability is improved. 本实用新型公开了一种轴向加长型减速机；其包括减速箱、衔接传动件和连接体；