Elasto-hydrodynamic lubrication of gears under coupling of vibration and contact impact

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (21) : 226-232.

JIAN Guangxiao, WANG Youqiang, YU Xiao, LUO Heng, LI Yunkai

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Abstract

In order to explore elasto-hydrodynamic (EHL) characteristics of gears under coupling of vibration and contact impact, considering effects of time-varying meshing stiffness on gear dynamic behavior, a 6-DOF friction dynamic model of involute spur gears was established based on the theory of dynamics.Then, the contact impact phenomenon caused by velocity difference at meshing point of gears was studied.Effects of dynamic load and steady load, impact position and impact rotating speed on gears’ time-varying EHL were analyzed contrastively.Results showed that compared with steady load, the EHL study based on dynamic load can more accurately reflect gears’ transient lubrication characteristics; the velocity difference at meshing point can cause contact impact phenomenon of two gears’ teeth; the impact rotating speed and position have larger influence on impact resultant force and further affect gears’ lubrication; the closer to meshing point the impact position, the higher the impact rotating speed, the more obvious the "surge" effect of gear lubrication; too high impact rotating speed or too small gear equivalent mass can cause "de-meshing" in gear transmission process.

Key words

involute spur gear / time-varying meshing stiffness / friction dynamic model / contact impact / lubrication characteristics

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JIAN Guangxiao, WANG Youqiang, YU Xiao, LUO Heng, LI Yunkai. Elasto-hydrodynamic lubrication of gears under coupling of vibration and contact impact[J]. Journal of Vibration and Shock, 2020, 39(21): 226-232

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