Vehicle axle lifting mechanism for heavy-duty commercial vehicle rear balance suspension system

The invention relates to a vehicle axle lifting mechanism for a heavy-duty commercial vehicle rear balance suspension system. The vehicle axle lifting mechanism is characterized in that an air springis connected with an upper cover plate and a lower cover plate through bolts, the upper cover plate is connected with upper supports through bolts, the upper supports are connected with a bearing axlethrough bolts, the lower cover plate is connected with connecting plates through bolts, and the connecting plates are connected with a vehicle frame through bolts. Compressed air provided by an air source is supplied to a hand-operated valve and a relay valve through air pipes simultaneously, the hand-operated valve is connected with the relay valve through an air pipe, the relay valve is connected with the air spring through an air pipe, and switching-on or switching-off of the hand-operated valve controls the relay valve to conduct air inflation or deflation on the air spring. According tothe vehicle axle lifting mechanism for the heavy-duty commercial vehicle rear balance suspension system, a single driving axle structure can be adopted by the balance suspension system, and a rear axle of the balance suspension system can be changed into a bearing axle, so that weight reduction and cost reduction can be achieved, and fuel is saved; and meanwhile, the rear axle can be lifted when avehicle is driven in an empty driving state, the driving resistance is reduced, and abrasion of rear axle tires is avoided.