WGP with brake disc tooth coupling, the coupling comprises a left shaft sleeve and a right shaft sleeve which are respectively used to connect the power input shaft and the power output shaft. The end of the left shaft sleeve is provided with a drum tooth. The connecting sleeve set on the periphery of the left shaft sleeve meshes with the drum tooth on the left shaft sleeve through its inner tooth. The end of the right sleeve is provided with a connecting flange, the connecting flange and the connecting sleeve are connected and fixed by a piercing bolt, and a brake disc is clamped and fixed between the connecting flange and the connecting sleeve. WGP with Brake disc tooth coupling simple structure, convenient installation, the brake disc and the right sleeve rigid connection, braking load and vibration in the braking process by the right sleeve, so it will not cause damage to the meshing performance of drum teeth, while the stability of the brake disc itself is also greatly improved. This ensures the reliability of operation. Tooth coupling is composed of the same number of teeth of the inner ring and with outer teeth flange half coupling and other parts. Divided into straight teeth and drum tooth outside two kinds of tooth shape, tooth is the so-called drum will made spherical outer teeth, spherical center on the gear axis, backlash is generally large gear, drum gear couplings allows a larger angular displacement (as opposed to straight tooth coupling), can improve the tooth contact conditions, improve the ability to transfer torque, prolong service life. The contact state along the tooth width with angular displacement.