Dynamic Wear Simulation Of Gear Pair Based On The Friction Work Principle

Gear is one of the most widely used mechanical parts to transmit power and movement. The wear of gear will deteriorate the contact conditions, change the gear teeth surface and result in stronger vibration, bigger noise, unsteady transmission and other problems, and even make a destructive effect on mechanical system. Thus the researches on the gear wear rules and the anti-wear technology are significant for industrial development. This paper summarizes the current research of gear wear on engineering experiments, simulation technology, wearable technologies and repairing methods. Since the existing simulation models of gear wear are mostly based on Archard's wear formula which is deduced from a single mechanism of adhesive wear, the theoretical basis is not sufficient, also the calculation is relatively complex. Due to these above problems, a numerical model of gear wear with consideration of dynamic changes in the morphology of modified involute spur gear is established according to the sliding wear computing formulas based on friction work principle proposed by ZHANG Yicheng by numerical calculation methods. And further the corresponding gear wear simulation software is developed based on MATLAB environment. The main tasks include the establishing of mathematical model of modified involute spur gear, the calculating of the instantaneous normal pressure, transmission ratio, slipping ratio and other parameters of each contact point on tooth profile, the judging of the contact state of each point according to conjugate condition and then the calculating of the wear of each contact point and the service life of gears. Finally, taking SS8 electric locomotive driving gears for example, the simulation results are analyzed, and the specific measures about the reduction of gear wear are proposed as well. The software can carry out instantaneous wear state estimation, tooth profile description, life prediction and a series of other functions. It's of great value in the design of anti-wear gears and the preventing of the damage of gear wear.