The invention discloses a hydraulic self-height regulating
bogie of a railway vehicle. The hydraulic self-height regulating
bogie of the railway vehicle comprises two wheel sets, axle boxes symmetrically arranged on the two sides of each wheel set, side frames arranged on the upper portions of every two axle boxes on the same sides, a swing
bolster arranged between the side frames on the two sides, elastic side bearings symmetrically arranged on the swing
bolster and a basic braking device; the two ends of the swing
bolster are located on lower chords of the side frames through swing mechanisms, a bottom center disc is arranged in the center of the swing bolster, the basic braking device is hung on a
cantilever beam of the swing bolster through a braking boom, a load spring is arranged between the middle of each axle box and a guide frame of the corresponding side frame, and self-height regulating devices are arranged on the two sides of each load spring respectively. According to the hydraulic self-height regulating
bogie, the load vehicle height of the vehicle is regulated to be increased by additionally arranging the self-height regulating devices between the axle boxes and the corresponding side frames, therefore, the center
disc height of the empty vehicle and the center
disc height of the load vehicle basically keep consistent, and not only can the hidden danger that a coupler is fractured due to a
height difference between couplers of the empty vehicle and the load vehicle be avoided, but also working deflection of spring hanging can be improved.