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工程科学与技术:2021,53(2):187-194
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滚轮平盘牵引式无级变速器自适应变速机构动力学分析
(1.成都理工大学 核技术与自动化学院,四川 成都 610059;2.四川大学 机械工程学院,四川 成都 610065)
Dynamic Analysis of Adaptive Shifting Mechanism of Roller Flat Disk Traction-type Continuously Variable Transmission
(1.College of Nuclear Technol. and Automation Eng., Chengdu Univ. of Technol., Chengdu 610059, China;2.School of Mechanical Eng., Sichuan Univ., Chengdu 610065, China)
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投稿时间:2020-01-09    修订日期:2020-03-23
中文摘要: 无级变速器(CVT)是一种理想的机械传动方案,随着现代工业和车辆技术的发展,希望CVT的变速机构对于负载改变能够实现自动/自适应变速,针对典型的同轴移动类牵引式CVT-滚轮平盘牵引式CVT,提出了一种基于螺纹-弹簧力封闭的自适应变速机构,并对其进行动力学研究。首先,给出具有螺纹-弹簧式自适应变速机构的滚轮平盘牵引式CVT结构模型;然后,分别对该CVT进行了运动学分析并给出运动学参数计算模型,根据赫兹接触理论建立其牵引点接触模型,采用分离体分析法建立了其动力学模型;最后,重点分析了变速过程中滚轮与平盘之间侧滑力的变化规律,分析出滚轮自适应负载变化的变速运动规律,研究了弹簧刚度系数对变速过程的影响,并对自适应变速过程的滚轮偏移规律进行了仿真实验验证。结果表明:自适应变速过程中,当侧滑率系数大于0.55时,侧滑力大小基本恒定;自适应变速过程为一振动过程,且变速机构中弹簧的刚度系数和负载力矩会直接影响变速响应时间和变速稳定时滚轮侧滑量大小;在同样大小的负载作用下,不同的初始负载条件会影响到变速振动的振幅,但对于变速稳定时滚轮的偏移量无较大影响;自适应变速过程的滚轮偏移规律的仿真结果与计算结果趋势吻合,但变速稳定时间有明显区别,仿真结果更接近实际情况。
Abstract:The continuously variable transmission (CVT) is an ideal solution of mechanical transmission. As the development of modern industry and vehicle technology, the CVT is expected to realize the adaptive shifting when the load changes. For the roller flat disk CVT, which is a kind of traction CVT that the output shaft is coaxial with the shifting direction of the shifting component, a screw-spring adaptive shifting mechanism (ASM) of load torque was proposed and the dynamic analysis was conducted. Firstly, the structure model of roller flat disk CVT with screw-spring ASM was described. Then, the kinematic model was established by using analytical method, the contact model was established with Hertz contact theory, and the dynamic model was conducted through the separation analysis method, respectively. Finally, the change regular of side-slip force between roller and flat disk, as well as the transformation law of roller during adaptive shifting of different load torque were mainly analyzed, and the effect of balance spring stiffness coefficient on shifting process was also studied. Simulation experiment was also carried out to verify the transformation law of roller during the adaptive shifting process. The results showed that: In the process of adaptive shifting, the side-slip force is basically constant when the side-slip coefficient is higher than 0.55; The adaptive shifting process is actually a vibration process, and the stiffness coefficient and the load variety could directly affect the dynamic response characteristics; When the initial load conditions are different, the same output load only affects the amplitude of the vibration, but there is no significant effect on the offset of the roller in the speed stabilization state. The simulation results of the transformation law during adaptive shifting process are consistent with the trend of the calculated results, but there is a clear difference between the stable time. The simulation results are closer to the actual situation.
文章编号:202000031     中图分类号:TH132    文献标志码:
基金项目:四川省科技厅应用基础研究计划项目(2012JY0085)
作者简介:第一作者:李超(1989-),男,讲师,博士.研究方向:机器人与新型传动技术.E-mail:lichao19@cdut.edu.cn;通信作者:姚进,E-mail:jinyao163@163.com
引用文本:
李超,姚进,李华,胡波.滚轮平盘牵引式无级变速器自适应变速机构动力学分析[J].工程科学与技术,2021,53(2):187-194.
LI Chao,YAO Jin,LI Hua,HU Bo.Dynamic Analysis of Adaptive Shifting Mechanism of Roller Flat Disk Traction-type Continuously Variable Transmission[J].Advanced Engineering Sciences,2021,53(2):187-194.