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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Numerical analysis on the effect of an oil level on heat transfer characteristics insise a transaxle composed of transmission gears, differential gears, and a brake system




Abstract

Transaxle system is used in a tractor as a combined system of transmission, differential gears, and a brake system. Often, the components inside such a system are partially submerged in oil, which serves for simultaneous lubrication and cooling. Hence, proper oil circulation is a key criteria for the durability and performance. The focus of this paper is on heat transfer and oil circulation analyses of a transaxle, especially the effect of an oil level on flow and heat transfer characteristics. Usually, due to the complex multiphase flow phenomena inside the transaxle chambers, their simulation is arduous, and hence, little technical information exists about the details of their multiphase phenomena. In order to imitate a real case situation, the numerical simulations are performed in an unsteady multiphase framework, with the volume of fluid (VOF) method, using the Realizable k-ε turbulence model. The overset mesh technique is also used to simulate the rotating gear system, the differential gear system and the brake system, which allows more realistic simulation of gears engagement. The aims are to predict flow characteristics, quality of lubrication and also heat transfer inside the transaxle system during its operation for different charged oil level. The results are presented and discussed in terms of lubrication and cooling efficiency.

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