The transmission device for driving wheels is located at the end of the automobile transmission system, and its function is to transmit the torque from the differential side gear to the driving wheels. In the disconnected drive axle and steering drive axle, the transmission device for driving wheels includes half axle and universal joint transmission device, and constant velocity joints are mostly used. On the general non-disconnecting drive axle, the driving device for driving the wheels is the half shaft, which connects the semi-uranium gear of the differential with the hub. On the drive axle with wheel reducer, the half shaft connects the half shaft gear with the driving gear of wheel reducer.