Roller motor

A roller motor comprises a roller having a driving motor; a front end of the roller is provided with a front end cover; a rear end of the roller is provided with a rear end cover; a center of the front end cover is penetrated by a front rotary shaft; a center of the rear end cover is penetrated by a rear rotary shaft; an output shaft of the driving motor is fixedly sleeved by a fixed disc; an output shaft of the driving motor is also movably sleeved by a movable disc; the movable disc is arranged in front of the fixed disc; the front end of the output shaft of the driving motor is provided with a screw segment screwed by a locking screw cap; an edge of the front end face of the fixed disc is provided with a rear slope; an edge of the rear end face of the movable disc is provided with a front slope; an expansion piece is clamped between the front and rear slopes, and two side faces of the expansion piece are respectively matched with the front and rear slopes; the locking screw cap is screwed backwards so as to push the movable disc inwards, so the expansion piece slides outwards so as to tightly attach with an inner wall of the roller. The roller motor is simple in structure, and very convenient in assembling.