This utility model relates to a small-displacement, high-speed cycloidal
hydraulic motor, belonging to the field of hydraulic
transmission technology. The small-displacement motor features a grooved stepped hole at the end of the
pressure balance plate that contacts the linkage shaft. The rotor-
stator pair parameters are configured to ensure the motor's output displacement is less than 100 ml / r, the
stator thickness is less than 10.5 mm, and the linkage shaft's meshing spline is a four-segment toothed structure. This utility model's small-displacement motor boasts a compact structure, stable and reliable small-displacement performance ensured by the rotor-
stator pair parameters, and sufficient strength and good heat treatment processability thanks to the short spline of the linkage shaft.