基于厚度变化的液力变矩器轻量化潜力研究

Light weight potential study of hydrodynamic torque converter based on thickness variation

摘要:

为探究液力变矩器工作轮轻量化后对其原始特性和工作部件强度的影响,基于某三元件液力变矩器样机,开发了液力变矩器三维流动轻量化平台. 采用贝塞尔曲线对变矩器工作轮叶栅系统和内外环曲面进行参数化建模,定义叶片和内外环的厚度系数. 使用实验设计方法（DOE）建立不同叶片和内外环厚度系数下各个工作轮的单流道模型,利用计算流体力学软件对单流道模型进行流场仿真,并将仿真结果用于厚度变化后的叶轮结构的单向流固耦合分析,以分析各个工作轮的厚度变化对外特性和强度的影响. 通过台架试验对轻量化后变矩器的性能进行测试,并结合仿真计算减薄后的外特性以及相应的应力和形变量变化. 结果表明:随着变矩器各部分厚度系数在1.0—0.3范围内的变化,变矩器整体的质量最多可减轻40%,变矩器可以承受结构大幅度减薄引起的应力增加,而结构减薄导致的流道和循环流量增加,会显著地提高变矩器各叶轮工作转矩.

Abstract:

To explore the influence of lightweight of hydrodynamic torque converter on its working characteristics and working parts, the hydrodynamic torque converter three-dimensional flow lightweight platform was developed based on the three components hydrodynamic torque converter prototype. By using the Bessel curve, the parameterized modeling of cascade system and the inner and outer ring surfaces was performed to define the thickness coefficients of the blades and the inner and outer rings. Design of experiment method (DOE) was used to establish each wheel with different thickness parameter of single flow channel model, and computational fluid dynamics software was used to calculate the single flow channel model for flow field simulation. The simulation results were used to analyze the unidirectional flow solid interaction calculation of wheels after thickness variation and its influence on the external characteristic and strength. The performance of lightweight torque converter was tested and the results show that with the decrease of thickness, the torque converter can withstand the stress increasing on structure, and the expandance of flow passage and circulatory flux will significantly improve the efficiency and torque values of pump and turbine wheels.