A novel variable transmission with digital hydraulics
A novel variable transmission with digital hydraulics
复制标题
采用数字液压系统的新型无级变速器
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
C. Remy
中科院分区：
文献类型：
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作者：
Zhenyu Gan;Katelyn E. Fry;R. Gillespie;C. Remy
提出了一种基于数字液压概念的新型变量传动系统。在提出的系统中，一组滚动膜片气缸通过不同的有效杠杆臂安装到输入和输出关节上。这些气缸的可变子集通过三通双位置开/关阀连接到公共液压歧管。这引入了对液压流量的可控约束，并创建了可编程的液压传动。通过三个单作用气缸，我们可以实现37种不同的传动比。本文对非完整流动约束进行了分析、模拟和实验样机研究。使用水作为流体，我们表明在±6°范围内可以实现非常刚性的传输（124.2 Nm/rad）。理论传动比的r平方值大于0.996，间隙小于1.4%。此外，我们展示了所提出的传输在身体动力膝盖-脚踝外骨骼模拟中的适用性。
This paper presents a novel variable transmission system that is based on the concept of digital hydraulics. In the proposed system, sets of rolling-diaphragm cylinders are mounted via different effective lever arms to an input and output joint. A variable subset of these cylinders is connected via three-way two-position on/off valves to a common hydraulic manifold. This introduces a controllable constraint on the hydraulic flow and creates a programmable hydraulic transmission. With three single-acting cylinders, we could realize 37 different transmission ratios. We investigated the nonholonomic flow constraint analytically, in simulation, and with an experimental prototype. Using water as fluid, we show that a very stiff transmission (124.2 Nm/rad) can be achieved within the range of ±6°. Theoretical transmission ratios are tracked with R-squared values of more than 0.996 and backlash is smaller than 1.4%. Furthermore, we show the applicability of the proposed transmission in the simulation of a body-powered knee-ankle exoskeleton.