Dynamic clearance measuring device for automobile hub bearing

The utility model discloses an automobile hub bearing dynamic clearance measuring device which comprises a lower positioning pedestal, an upper positioning pedestal, a lower loading ring, an upper loading ring, a first displacement sensor assembly, a second displacement sensor assembly, a first driving unit, a second driving unit and a third driving unit. The lower positioning pedestal and the upper positioning pedestal are oppositely arranged and abut against the upper end face and the lower end face of the bearing inner ring correspondingly under the action of the first driving unit, and the second driving unit can transmit rotating motion to the lower positioning pedestal and the upper positioning pedestal to drive the bearing inner ring to rotate. The lower loading ring and the upper loading ring are oppositely arranged and can abut against the upper end face and the lower end face of the bearing outer ring respectively, the first displacement sensor assembly is used for monitoring axial run-out of the lo