Input shaft reducing sleeve

The utility model provides an input shaft adapter sleeve which comprises an adapter sleeve body, the adapter sleeve body is cylindrical, a circular through hole is formed in the adapter sleeve body, internal spline teeth are arranged on the inner wall of the circular through hole, and a protruding flat key is arranged on the outer surface of the adapter sleeve body in the axial direction. According to the utility model, the adapter sleeve body is arranged, the circular through hole is arranged in the adapter sleeve body, the inner wall of the circular through hole is provided with the internalspline teeth, and the convex flat keys are arranged on the outer surface of the adapter sleeve body along the axial direction. According to the utility model, the butt joint structure of the output shaft of the motor or the input shaft of the speed reducer does not need to be changed, and the spline motor can be used for being in butt joint with the flat key speed reducer, so that the productioncost is greatly reduced. 本