Chassis shaft structure, snow vehicle and automobile

The utility model discloses a chassis shaft structure, a snowmobile and an automobile, belongs to the technical field of shaft structures, and solves the problem that tightening torque of fixing nuts at two ends of an existing shaft structure is low. The structure comprises an intermediate shaft, a large-end bearing, a spacer bush, a bearing sleeve, an adjusting gasket, a small-end bearing, a fixing nut, a top sleeve, a large-end hole table and a small-end hole table. The large-end bearing and the small-end bearing are located on the left side and the right side of the bearing sleeve correspondingly and fixed to a large-end hole table and a small-end hole table of the bearing sleeve correspondingly. The spacer bush and the adjusting gasket are placed between the large-end bearing and the small-end bearing and abut against the inner sides of inner rings of the large-end bearing and the small-end bearing; the intermediate shaft is fixed in an inner ring on the left side of the large-end bearing; the top sleeve