Measuring methods of pre-tightening force of loader driving bevel gear based on differential tightening

Aiming at??the pre-tightening problems of the driving bevel gear of the main transmission device of the loader, the relationship among the bearing axial pre-tightening force of driving bevel gear, the axial relative displacement of the bearing inner and outer ring and the pre-tightening moment, was analyzed. The paper suggested measuring bearing start friction moment, which was easy to achieve and had highly precise, instead of measuring the axial pre-tightening force, which was hard to achieve. The equipment which realized the measuring of the bearing start friction torque had been developed successfully. It could make the rotational speed of the lock nut in the main transmission device a little faster?than that of the driving bevel gear, and the differential speed was used to tighten the lock nut and the bearings gradually. It had the function of measuring the pre-tightening moment and the start friction moment automatically at the same time, the driving bevel gear was assembled automatically. The equipment has been put into operation for more than two years, and can relieve the labor intensity and improve the assembling quality and efficiency of the main transmission device.