摩擦式双级分段变刚度汽车双质量飞轮设计理论研究及应用

Research and Application on Design Theory of Friction Dual Mass Flywheel with Double-stage Piecewise Variable Stiffness

提出基于摩擦的双级分段变刚度汽车双质量飞轮的设计理论,实现了兼顾低转速、低转矩小扭转角下具有小刚度的柔性和大扭转角时具有高反抗转矩和大刚度的设计要求。分析所提出的摩擦式双级分段变刚度双质量飞轮结构及工作原理;对所能实现的二级过载保护的结构实现进行剖析;导出摩擦式双级分段变刚度双质量飞轮转矩特性的数学力学模型;试验表明,转矩特性的测试结果与所构建模型的仿真分析基本一致;研究扭转刚度对传动系一、二阶共振转速的影响;将利用摩擦实现增大转矩和过载保护的理念引入双质量飞轮的设计,为高性能双质量飞轮产品的开发提供了设计思路,揭示出引入摩擦的双级分段变刚度双质量飞轮减振器优良减震的内在本质。

The design theory of friction double-stage piecewise variable stiffness dual mass flywheel is proposed. Using the given design method, the flexibility with low spring rate of dual mass flywheel at low speed, low torque and low wind-up angle can be realized, and high spring rate and high counter torque at high wind-up angle can also be achieved. The structure and working principle of the proposed friction double-stage piecewise variable stiffness dual mass flywheel is analyzed. The structure for two-stage overload protection is designed, then the mathematical-mechanical model of torque characteristics of friction double-stage piecewise variable stiffness dual mass flywheel is derived, and the test show that the test results of torque characteristics is consistent with the simulation analysis of the constructed model. The affection of spring rate on transmission system＇s first and second order resonance speed is researched. The idea that using friction to increase torque and to realize overload protection is introduced into the design of dual mass flywheel, so the design method for high quality dual mass flywheel can be got, the intrinsic nature for vibration damper of double-stage piecewise variable stiffness dual mass flywheel is also revealed.