Semi-open brake system front axle

The utility model discloses a front axle of a semi-open brake system. The front hub is supported at one end of the front axle through a hub bearing; a brake drum is fixed on the inner side of the front hub through hub bolts and nuts; a brake assembly is arranged between the inner side of the brake drum and the outer side part, sleeved with the hub bearing, of the front hub; two semi-annular brakeshoe belt friction plate assemblies of the brake assembly are rotationally arranged in the brake drum through shoe shafts respectively; the brake shoe belt friction plate assembly on one side of the shoe shaft is further elastically connected through a small return spring, the other end of the brake shoe belt friction plate assembly is located between the adjusting blocks of the automatic adjusting arms, the two ends of the front shaft are further provided with an air chamber support and a knuckle belt lining assembly respectively, and an air chamber assembly is fixed to the air chamber support. According to the utili