LIFT AXLE DEVICE

This lift axle device comprises: a first air spring which corresponds to a first axle; a second air spring which corresponds to a second axle that reciprocates between a down position and lift position; an air bellows; a pneumatic circuit which has a solenoid valve; and a control circuit. The control circuit controls the supply of electric power to the solenoid valve. If the pressure transitions to less than a first pressure, the second axle is placed in the lift position. If the pressure transitions to at least a second pressure, the second axle is placed in the down position. If the pressuretransitions to at least the first pressure and less than the second pressure, the second axle is caused to maintain the position thereof. 车轴升降装置具备对应于第1车轴的第1空气弹簧、对应于在下降位置与提升位置之间升降的第2车轴的第2空气弹簧、空气风箱、具有电磁阀的空压回路以及控制电路。控制电路控制对电磁阀的电力供给。在压力迁移到小于第1压力的情况下，第2车轴配置于提升位置，在压力迁移到第2压力以上的情况下，第2车轴配置于下降位置，在压力迁移到第1压力以上且小于第2压力的情况下，维持第2车轴的配置。