Anti -backlash gear subassembly and balanced axle assembly

The utility model relates to an anti -backlash gear subassembly technical field to an anti -backlash gear subassembly and a balanced axle assembly is provided, the anti -backlash gear subassembly includes: the master gear, main gear -type becomes to have main tooth central through hole and main tooth to lead to the groove, and one side of master gear be formed with with the coaxial annular boss of main tooth central through hole, the pinion, vice gear -type becomes to have vice tooth central through hole and vice tooth to lead to the groove, the pinion passes through vice tooth central through hole can rotate the ground suit relatively and be in on the outer peripheral face of annular boss, and elasticity filling block, the elasticity filling block is filled simultaneously main tooth lead to the groove with in the logical groove of vice tooth, so that the master gear with the relative rotation of pinion has the elastic recovery position, during the elastic recovery position, the teeth of a cogwheel on the mas