Modified wheel body structure

The utility model relates to an improved wheel body structure. A central sleeve is arranged in a rotating base outer sleeve which is connected with a main body and wheels, a main axle is arranged in the central sleeve, an bearing is arranged correspondingly on the main axle and embedded into the central sleeve, a notch top edge is arranged at the top end of the central sleeve to correspond to the pressing and positioning of a top cover, simultaneously, an assembly platform is extended outside the top cover of the central sleeve, a brake block group and a pressing plate group can be pivotally and correspondingly jointed on the assembly platform, braking can be realized by treading a large pressing plate in the pressing plate group to push the assembled brake block group, or the braking motion can be released by propping against the large pressing plate through the small pressing plate in the pressing plate group, therefore not only the main axle and the bearing has good fixing and limit effect, but also the as