Transient Meshing Contact Simulation of Locomotive Traction Helical Gear

doi:10.3901/JME.2023.22.401

Abstract

Abstract: Gear pair is a key transmission part widely used in mechanical structures, the operating quality of which is directly affected by the meshing contact state. A 3D gear pair transient meshing contact model is developed based on explicit finite element method, where the complex factors such as the gears’ 3D geometry, elastic deformation and system vibration are taken into account. The transient meshing contact between the gear teeth is simulated in the time domain. The time-varying contact patch, normal/tangential contact stress, relative slippage and tooth surface wear are obtained. The meshing contact between tooth surfaces is solved by a surface-to-surface contact algorithm. Non-Newtonian EHL friction introduced, and the Archard model of partial-EHL is used to calculate surface wear. Taking a traction helical gear pair of a high-power electric locomotive in China as an example, the influence of speed and traction coefficient on meshing contact behavior of gear teeth under ideal profile is analyzed. It is found that the approximate steady-state meshing contact is basically established after dynamic relaxation of 0.008 s, 0.011 5 s, 0.012 s at running speeds of 65 km/h, 100 km/h, 120 km/h, respectively. As the gear teeth enter and exit meshing, the contact force of the gear pair fluctuates periodically around its theoretical solution. The contact force and stress increase with the traction coefficient. At a speed of 65 km/h, the maximum contact area and wear depth at a traction coefficient of 0.27 mm² are 432.22 mm² and 32.94×10^-9 μm respectively, which are 1.2 and 1.6 times of the case with traction coefficient of 0.15. The increase in speed reduces the wear depth. With a traction coefficient of 0.15, the maximum wear depth per meshing at 120 km/h is 48% lower than that at 65 km/h. In the future, tooth wear and fatigue damage can be further introduced to provide a basic analysis tool for studying transient gear meshing behavior and its influence under non-ideal conditions.

Key words: gear pair, explicit finite element method, transient meshing contact, contact stress, tooth surface wear

CLC Number:

TH132

FAN Wei, ZHAO Xin, LUO Yifei, WEN Zefeng, JIN Xuesong. Transient Meshing Contact Simulation of Locomotive Traction Helical Gear[J]. Journal of Mechanical Engineering, 2023, 59(22): 401-410.

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