The utility model discloses a speed reducing motor capable of adjusting back clearance, which comprises a box body, a box cover, a transition
flange, a motor main body, a transmission
assembly and an output shaft, the box cover is fixedly arranged on the box body, the surface of the box cover is provided with a circular mounting groove, a through hole is arranged in the circular mounting groove, and the axis of the through hole deviates from the axis of the circular mounting groove; the transition
flange is of a hollow annular structure, the transition
flange is rotatably mounted in the circular mounting groove, and the transition flange is connected with the box cover through a detachable connecting piece; the motor main body is fixedly arranged on the transition flange, and a rotating shaft of the motor main body is inserted into the through hole; a gear shaft is integrally formed on the rotating shaft; the output shaft is rotationally arranged on the box body, an output tooth piece is fixedly arranged on the output shaft, and the transmission
assembly is arranged between the gear shaft and the output tooth piece in a transmission mode. The gear motor has the advantages that the gap between the gear shaft and the transmission gear sheet can be adjusted by rotating the transition flange, so that the gear motor has higher transmission precision.