Design, Modeling, and Experimental Validation of a Novel Infinitely Variable Transmission Based on Scotch Yoke Systems
Design, Modeling, and Experimental Validation of a Novel Infinitely Variable Transmission Based on Scotch Yoke Systems
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DOI：
10.1115/1.4031499
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发表时间：
2016
影响因子：
3.3
通讯作者：
Xuefeng Wang;W. D. Zhu;W. D. Zhu
中科院分区：
文献类型：
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作者：
Xuefeng Wang;W. D. Zhu;W. D. Zhu
设计了一种基于止转轭系统的新型无级变速器（IVT），以提供从零到指定值的连续变化的输出输入速度比。通过改变止转轭系统的曲柄长度，可以连续地调节IVT的速比。IVT由一对非圆齿轮和两个模块组成：输入控制模块和运动转换模块。输入控制模块采用两个行星齿轮组来联合收割机将IVT的输入速度与来自改变止转轭系统的曲柄长度的步进电机的控制速度相结合。运动转换模块采用两个止转轭系统将输入控制模块输出的组合速度转换为各止转轭的平移速度，再通过齿条传动将平移速度转换为输出速度。运动转换模块的输出与输入控制模块的输入之间的速度比具有类正弦波形的形状，其产生瞬时变化。止转轭系统的使用提供了隔离曲柄长度和速比形状之间的相互作用的益处，并且一对非圆齿轮可以用于消除所有曲柄长度的速比的瞬时变化。建立了IVT的原型，并对其运动学行为进行了实验验证。进行了驾驶测试，以检查IVT的性能。
A novel infinitely variable transmission (IVT) based on scotch yoke systems is designed to provide a continuously varied output-to-input speed ratio from zero to a specified value. By changing the crank length of scotch yoke systems, the speed ratio of the IVT can be continuously adjusted. The IVT consists of a pair of noncircular gears and two modules: an input-control module and a motion conversion module. The input-control module employs two planetary gear sets to combine the input speed of the IVT with the control speed from the stepper motor that changes the crank length of scotch yoke systems. The motion conversion module employs two scotch yoke systems to convert the combined speeds from the input-control module to translational speeds of yokes, and the translational speeds are converted to output speeds through rack–pinions. The speed ratio between the output of the motion conversion module and the input of the input-control module has a shape of a sinusoidal-like wave, which generates instantaneous variations. Use of scotch yoke systems provides a benefit to isolate the interaction between the crank length and the shape of the speed ratio, and a pair of noncircular gears can be used to eliminate the instantaneous variations of the speed ratio for all crank lengths. A prototype of the IVT was built and instrumented, and its kinematic behavior was experimentally validated. A driving test was conducted to examine the performance of the IVT.