The utility model discloses a single round drive, nimble, the good travel drive wheel of lifting machine is collected to self -propelled material of stability that turns, it includes the frame, installs the swing arm in the characterized by frame, installs the walking shaft who is driven by power on the swing arm, the travel drive wheel is installed on walking shaft, the utility model discloses simple structure, travel drive wheel suspension arrangement does not have unilateral phenomenon in the middle of collecting the lifting machine frame, and it is nimble to turn, and when the unevenness of ground, installs the swing arm of travel drive wheel because the effort of spring can wind the rocking pin luffing motion to make travel drive wheel and ground be in good contact all the time, the work of collection lifting machine is steady.