NGCLZ drum gear coupling with brake wheel belongs to rigid-flexible coupling. Gear coupling is composed of inner gear ring with the same number of teeth and flange half coupling with external teeth. External teeth are divided into two types of tooth shapes: straight teeth and drum teeth. The so-called drum teeth are made into spherical surfaces with the center of the sphere on the gear axis. The tooth side clearance is larger than that of general gears. Drum gear coupling can allow larger angular displacement (relative to straight gear coupling), which can improve the contact conditions of teeth, improve the ability to transmit torque, and extend service life.