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Abstract
An accurate simulation model of the lubrication system is essential for early design of the heavy truck transmission. In this article, a detailed computational method for the flow network analysis of the lubrication circuit is developed based on the hydraulic theory, and the flow resistance through the oil pipes and orifices is also taken into consideration. Then, the Next Limit Technologies’ XFlow, a potential new three-dimensional computational fluid dynamics software based on lattice Boltzmann method, is adopted to obtain the relationship between the oil delivery and the lubrication effect in the low-pressure capillary lubrication network of the rear auxiliary gearbox. To achieve the best overall lubricating performance of the flow network, the optimized design of the diameter for each oil supply orifice is determined by a detailed sensitivity analysis on the contribution of each parameter to the volumetric flow rate. The bench tests for the volumetric flow rate have been performed for validating the computation model by comparing the predicted volumetric flow rate through each oil supply bore with the experimental data at various pump speeds. The endurance tests have further conducted and the test results indicate a remarkable reduction in mechanical weariness when the best solution of the flow network design for the transmission lubrication system is adopted.
Highlights
The quality of transmission lubrication depends upon how much oil is supplied and how the lubricant is delivered under pressure to the lubricated components, since the lubricant oil can protect the rotary components, such as gears and bears, against friction and wear.[1]
Some other schemes are necessary to be incorporated into the fluid network design, such as the three-dimensional (3D) computational fluid dynamics (CFD) analysis based on the Limit Technologies’ XFlow
The bench tests for the volumetric flow rate have been performed for validating the calculation accuracy of both benchmark and optimal designs, and the endurance tests indicate a remarkable reduction in mechanical weariness when the best solution of the flow network design for the transmission lubrication system is adopted
Summary
The quality of transmission lubrication depends upon how much oil is supplied and how the lubricant is delivered under pressure to the lubricated components, since the lubricant oil can protect the rotary components, such as gears and bears, against friction and wear.[1]. To achieve a proper lubricant distribution for the flow network, the optimized design of the diameter for each oil supply orifice is determined by a detailed sensitivity analysis on the contribution of each parameter to the volumetric flow rate.
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