Circumferential backlash measuring and coloring positioning device for bevel gear pair

The utility model discloses a circumferential backlash measuring and coloring positioning device for a bevel gear pair. The tensioning device comprises a tensioning shaft, a pressing shaft, a fixing frame, a bearing, an expansion set and a locking set. The fixed frame is fixedly arranged on the output end speed reducer shell; the bearing is mounted on the fixed frame; the pressing shaft is sleeved with the bearing and extends into the output gear; the tensioning shaft is arranged in the pressing shaft in a penetrating mode and is in threaded connection with the pressing shaft, the end, close to the output gear, of the tensioning shaft exceeds the pressing shaft, the expansion set is installed at the exceeding end of the tensioning shaft and expands with the inner wall of the output gear, and the locking set is arranged on the fixing frame and the pressing shaft and locks and locates the pressing shaft in the axial direction and the radial direction. The device has the advantages of being easy and convenient t