Abstract
To predict the temperature distribution of the tooth surface of a herringbone gear pair, a numerical method for the determination of frictional heat generation was proposed by establishing a thermal elastohydrodynamic lubrication (TEHL) model in the meshing zone taking surface roughness into account. According to the real micro topography of the tooth surface measured by a non-contact optical system and loaded tooth contact analysis, the friction coefficient was obtained by a TEHL analysis and then the heat generation in the contact zone was determined. With the combination of heat generation and heat dissipation analysis, the single tooth model of the herringbone gear pair due to the finite element method (FEM) was proposed and the steady-state temperature distribution of the tooth surfaces was predicted by FEM simulations. The simulation and the experimental results demonstrated good agreement, which verified the feasibility of the present numerical method.
Highlights
Elastohydrodynamic LubricationGears are widely used in motion transmission applications
The relative sliding between tooth surfaces generates a large amount of frictional heat, which may lead to scuffed gears
Investigations into lubrication conditions, the thermal heat generation mechanism, and the temperature distribution of the tooth surface have a great effect on the improvement of the transmission performance and the working life of herringbone gears
Summary
Gears are widely used in motion transmission applications. Compared with other gears, herringbone gears have become the main transmission components in aerospace and marine power transmission systems due to their advantages of high contact ratio (HCR), high bearing capacity and stable transmission. Investigations into lubrication conditions, the thermal heat generation mechanism, and the temperature distribution of the tooth surface have a great effect on the improvement of the transmission performance and the working life of herringbone gears. Presented a numerical model to predict the thermal behaviors in the mixed lubrication condition and analyzed the heat transfer based on an FEM [18]. Obtained the temperature distribution and established the formulas to calculate the frictional heat flux and convective heat transfer coefficient of different tooth surfaces [19]. For a spiral bevel gear pair, Lu et al obtained the lubrication and temperature characteristics in the splash lubrication condition using the multiple reference frames method based on CFD, and investigated the influence of different oil immersion depth and operating parameters on the convective heat transfer coefficient [20]. Test rig, and the and themethod experimental results demonstrated a good agreement, so the numerical method is validated and can give advices for follow-up
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