It is featured by light dead weight, long service life, stable and light steering and convenient maintenance, etc. This axle is equipped with independently developed disk overhead steering knuckle, realizing the arrangement of parking braking dual-chamber air chamber; the air chamber is set on the top of the steering knuckle, improving the arrangement of the complete vehicle and also the steering performance; the new wheel end lubricant and adjusting-free structure realize free maintenance in the full life circle, improving the product reliability and better meeting the requirements of long-distance logistics market.