Drum drum gear coupling with a flexible coupling, lifting equipment is mainly used for hoisting mechanism reducer output shaft and the connection wire rope reel, also apply to both the transfer switch to other similar moments and radial load of machinery and equipment, but can not be used as required axial load transmission. Roll coupling with the drum gear from the semi-coupling method, and internal ring gear connected with the jacket, with a spherical bearing rings, end caps and seals and other components. DC series reel drum gear coupling with the following characteristics: stable operation, can transmit large torque, radial load capacity, can compensate for axis offset can be applied to common shaft reducer, compact structure, easy to install, with a wear indicator, safe and reliable, especially for lifting equipment lifting body.