Main speed reducer assembly for preventing leakage at flange nut

The utility model relates to a main speed reducer assembly capable of preventing leakage at a flange nut. Including a drive gear, the inner bearing is arranged above the driving gear; the inner bearing adjusting gasket is positioned between the inner bearing and the driving gear; an elastic spacer bush is arranged on the inner side of the inner bearing; an outer bearing is arranged above the elastic spacer bush, a driving gear flange is arranged on the outer side of the outer bearing, a flange nut is installed above the driving gear flange, and the flange nut, the driving gear flange, an innerring of the outer bearing, the elastic spacer bush, an inner ring of the inner bearing, the inner bearing adjusting gasket and the driving gear are tightly attached to form an inner sealing anti-leakage structure. Before assembly according to the design requirement, two rubber strips are symmetrically and axially coated at the internal thread of the flange nut or the external thread of the driving gear by 180 degrees thr