Tribological properties of a helical gear pair considering interfacial slip between lubricant and tooth surface

Abstract

In this study, an interfacial slip model including the limiting shear stress is proposed and applied to the thermal elastohydrodynamic lubrication (EHL) analysis of a helical gear pair. The main difference between the proposed model and the classical EHL model is that, the term of entrainment velocity in Reynolds equation is modified. The influences of interfacial slip, thermal effect, initial limiting shear stress and operating conditions on the tribological properties are evaluated. Due to the interfacial slip, the pressure distribution moves towards the inlet region, and the fluctuation distributions of entrainment velocity and film thickness are similar to the trigonometric function. The influence of thermal effect on interfacial slip cannot be ignored, especially in the case of high speed and heavy load. As the input torque and input rotational speed increase, the interfacial slip gradually extends to the whole meshing process.

A Tribo‐Dynamic Model of a Helical Gear Pair Based on the Finite Line Contact Theory

“…Te angle between the contact line and the rotation axis of the gear is equal to the helix angle of the base circle, i.e., β b . A coordinate system is established as shown in Figure 1, where the y-axis is located at the contact line direction [9][10][11][12].…”

“…In this article, a thermal elastohydrodynamic lubrication model is adopted to simulate the lubrication state of the helical gear tooth surface. In addition, the non-Newtonian characteristics of lubricants are considered [9][10][11][12]. Based on the coordinate system shown in Figure 1, the generalized Reynolds equation is given as…”

“…Liu et al [7,8] proposed a thermal EHL model of the spur gear under starved lubrication and discussed the infuence of oil supply on lubrication performance. Based on the fnite line contact theory, Liu et al [9][10][11][12] established a fnite line contact thermal EHL model for helical gears and systematically studied the infuence of geometric parameters and working conditions on the lubrication performance. Liu et al [13,14] investigated the lubrication performance of spur gear under the dynamic load.…”

Review of Wind Power Bearing Wear Analysis and Intelligent Lubrication Method Research

“…However, during this stage, the oil film is not yet fully formed, and there is still some direct contact between the shaft and the bearing. This is known as the mixed lubrication stage [150,151]. As time passes, the lubricating fluid fills the lubricant, forming a thick oil film that separates the shaft and bearing, preventing any contact.…”