The utility model relates to a part of a heavy off-road vehicle, in particular to an integral steering knuckle structure used for the front steering drive axle of a heavy off-road vehicle.

   The steering drive axle of heavy off-road vehicles mainly adopts Steyr technology. The steering knuckle, axle head, axle fork, kingpin, axle housing and other components constitute the steering mechanism of the steering drive axle. Among them, the steering knuckle is connected with the shaft head, the shaft fork and the axle housing respectively by bolts, and the steering knuckle rotates around the kingpin to realize the steering function of the steering drive axle. This structure has some disadvantages, such as complex structure, tedious assembly process, and the limitation of axle fork and axle housing connection bolts makes the flange of the axle housing become the stress concentration point, which affects the overall bearing capacity of the whole bridge.