The invention discloses an auxiliary
brake device applied to a non-drive axle. The auxiliary
brake device applied to the non-drive axle comprises an axle shell of the non-drive axle, wherein shaft heads are respectively fixed at two ends of the axle shell, the outer surface of each shaft head is connected with a wheel hub through a bearing, a hydraulic
retarder is arranged between the wheel hub and an end portion of each shaft head, each hydraulic
retarder comprises a
stator impeller fixed on the outer surface of the end portion of each shaft head and a rotor
impeller which is covered outside each
stator impeller and fixed with the wheel hub, and a hydraulic oil work cavity is formed between the inner surface of each rotor impeller and the outer surface of each
stator impeller. An oil inlet
pipe and an oil return
pipe are arranged on the axle shell, each shaft head is provided with an axial through hole, each axial trough hole forms a part of an oil pipeline passage of each hydraulic
retarder, and the oil inlet
pipe and the oil return pipe are communicated with the hydraulic oil work cavities through the axial through holes in the shaft heads. The auxiliary
brake device applied to the non-drive axle is capable of effectively improving the brake capacity of vehicles, especially a trailer, a semitrailer, a heavy
truck and a large
bus, and guarantees
driving safety.