Thermoelastohydrodynamic Analysis of Spur Gears with Consideration of Surface Roughness |
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Authors: | S Akbarzadeh M M Khonsari |
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Affiliation: | (1) Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803, USA |
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Abstract: | Thermoelastohydrodynamic lubrication (TEHL) analysis for spur gears with consideration of surface roughness is presented.
The model is based on Johnson’s load sharing concept where a portion of load is carried by fluid film and the rest by asperities.
The solution algorithm consists of two parts. In the first part, the scaling factors and film thickness with consideration
of thermal effect are determined. Then, simplified energy equation is solved to predict the surfaces and film temperature.
Once the film temperature is known, the viscosity of the lubricant and therefore friction coefficient are calculated. The
predicted results for the friction coefficient based on this algorithm are in agreement with published experimental data as
well as those of EHL simulations for rough line contact. First point of contact is the point where the asperities carry a
large portion of load and the lubricant has the highest temperature and the lowest thickness. Also, according to experimental
investigations, the largest amount of wear in spur gears happens in the first point of contact. Effect of speed on film temperature
and friction coefficient has been studied. As speed increases, more heat is generated and therefore film temperature will
rise. Film temperature rise will result in reduction of lubricant viscosity and consequently decrease in friction coefficient.
Surface roughness effect on friction coefficient is also studied. An increase in surface roughness will increase the asperities
interaction and therefore friction coefficient will rise. |
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Keywords: | Thermoelastohydrodynamic analysis Surface roughness Spur gears |
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