The Load Distribution with Modification and Misalignment and Thermal Elastohydrodynamic Lubrication Simulation of Helical Gears

Abstract

A non-uniform model of the load per unit of length distribution of helical gear with modification and misalignment was proposed based on the meshing stiffness, transmission error, and load-balanced equation. The distribution of unit-lineload, transmission error (TE), and contact press of any point on the contact plane were calculated by the numerical method. The feature coordinate system was put forward to implement the helical preliminary design and strength rating.The thermal elastohydrodynamic lubrication (EHL) model of helical gear was established, and the pressure, film, and temperature fields were obtained from the thermal EHL model.The maximum contact temperature and minimum film thickness solved by thermal EHL were applied to check the scuffing load capacity. The highest flash temperature and thinnest film occur in the dedendum of the pinion. The thermal EHL method to evaluate the scuffing load capacity is effective.

Study on TEHL flash temperature of helical gear pair considering profile modification

“…Based on the meshing and lubrication theories, Peng et al (2018) introduced a non-Newtonian TEHL model for the helical gears with the modification and misalignment, and found that the double-crowning profile can improve the lubrication performance. Furthermore, Xue et al (2020) also numerically investigated effects of the modification and misalignment on the TEHL behavior of the helical gear. Recently, Xiao et al (2021) purposed a transient non-Newtonian TEHL point contact model for the modified herringbone gear drive, in which the fundamental parameters are obtained for the meshing and kinematics analyses, and studied the lubrication behavior of the gear pair in the steady running and start-stop phases.…”