Vehicle and steering system and steering engine thereof

The utility model discloses a vehicle and a steering system and a steering engine thereof, the steering engine comprises a shell and an input shaft, one side of the shell is provided with a through hole, the input shaft is rotatably installed in the through hole in a penetrating mode, and the outer side of the through hole of the shell is provided with a sealing piece and a first protective cover which are arranged on the input shaft in a sleeving mode; the first protective cover is provided with an end face perpendicular to the input shaft and a circumferential face wrapping the sealing piece and part of the shell, a limiting part protruding in the direction of the input shaft is arranged at the joint of the end face and the circumferential face of the first protective cover, and the limiting part can prevent other parts of the first protective cover from making contact with the shell. According to the steering engine shell, the structural construction of components of the steering engine shell can be optimi