Sheet Metal-type Hydraulic Torque Converter And Experimental Study Of Modern Design Methods Based On Numerical Solution Of Three-dimensional Flow Field

Vehicle transmission torque converter is one of the key components in its main role is to smooth the engine's power spread to the implementing agencies. The current sheet metal hydraulic torque converter with its compact structure, good performance, suitable for mass production gradually replaced the traditional advantages of casting hydraulic torque converter, but the existence of sheet-type torque converter design and manufacturing is more difficult than big problem. In this paper, Shan'xi Science fund project "sheet metal hydraulic torque converter performance and critical theory" in accordance with the modern design of converter theory, three-dimensional sheet metal hydraulic torque converter flow field, the axial force, deformation theory and fatigue life in depth.Torque converter design method development direction is three-dimensional flow theory, in recent years, with the CFD technologies to the industrial application stage, full three-dimensional viscous flow analysis techniques mature, Shide accurate torque converter to solve flow within the Fuza possible. In this paper, the project co-operation with a certain construction machinery sheet metal hydraulic torque converter for the study. In such sheet metal hydraulic torque converter, the first of its structure is simplified, with UG and Gambit software, access to the grid all the work rotation Road model, combined with modern fluid dynamics theory, simulation software, FLUENT through the work of each rotation Road the three dimensional flow field numerical simulation method proposed external characteristic. Experimental design and build a high precision, to more accurately simulate actual working conditions of the new test bed, and the study of sheet metal hydraulic torque converter to the external characteristic experiment. Experimental results and simulation calculation results show that the simplifying assumptions made in accordance with this article and the calculation model, access to adequate and accurate results. In three typical working conditions, job rotation Road on the various internal pressure, speed, flow line characteristics of the import side of the detailed analysis, comparing the conclusion:the internal high-speed torque converter gradient, pressure gradient, and the return secondary flow, vortex flow so unusual impact on the converter performance, especially significant effect on the torque converter efficiency, thus more accurate grasp of three-dimensional torque converter flow field within the rules, and advanced design theory and way for the development and improvement of hydraulic torque converter to provide a reliable basis.In the three-dimensional numerical calculations based on sheet metal hydraulic torque converter of the axial force, deformation theory, reliability and fatigue life were studied. On the one hand, around the sheet metal hydraulic torque converter to analyze the force, using mathematical methods, calculated on the axial impeller torque converter 3 and the deformation contribute to the theoretical calculation model, and experimental comparative study. The results show that the axial flow field based on the calculation model is more realistic;On the other hand, on the sheet metal hydraulic torque converter shell model can be simplified, three-dimensional numerical calculation based on the fatigue simulation using finite element software MSC.Fatigue calculated the shell of the stress and strain distribution and shell surface fatigue life map, you can determine the shell at the design stage of the fatigue life of the weak position, in this case based on the obtained results of the full life predictions; Finally, hydrostatic expansion test the durability of the simulation experiments and results were verified and analyzed, the results show that the sheet metal based MSC.Fatigue hydraulic torque converter shell on fatigue life prediction simulation accuracy.This article's research results to improve the performance of sheet metal hydraulic torque converter to provide a reliable numerical simulation and theoretical basis; the same time, improve product reliability and life, shorten the development cycle, reduce cost, optimize product quality has some theoretical and practical significance.