SigGear transmission planetary gear reduction motor is widely used in robot joints, which greatly improves the quality and efficiency of the robot. Our robot joint gear has two-stage, three-stage and four-stage drive changes. The reduction ratio can be changed and the input speed and torque of the gearbox can be adjusted according to the design requirements of the robot motor. In addition, the robot motor gearbox produced by us has the characteristics of low voltage, low power, low speed, low noise, long service life, miniature and high torque, which can better meet the driving requirements of the six degree of freedom robot.