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An innovative working concept for variable delivery flow external gear machine.

机译：可变输出流量外齿轮机的创新工作理念。

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摘要

An innovative and unique working concept for variable delivery external gear machines (VD-EGMs) is presented in this study. The proposed design not only encompasses all the well-known and important advantages of traditional external gear machines but also introduces a feature for varying the displacement (flow delivered per unit revolution). The novel principle of achieving variable displacement in EGMs is based on the variable timing of the connections of the displacement chambers/tooth space volumes (TSVs) with the inlet/outlet ports. The timing variation is obtained by the addition of a simple element (called a "slider") within the lateral bushings. The position of the slider determines the amount of flow displaced per unit revolution. Starting from the geometry of the design and the proposed concept, analytical expressions for predicting displacement variation, flow rate and input shaft torque were derived. With this working principle, the range of variation of the displacement can be significantly increased by modifying the gear profiles. Therefore, in this work, novel gears with asymmetric teeth profile are designed with the help of a novel tool developed particularly for this process. However, due to the inherent nature of the displacing action of the EGM due to the meshing of the gears, it is not possible to achieve a full flow variation from 0%-100%. Therefore, to maximize the range of flow variation while considering all the other important performance features of the machine to be maintained at an optimum, a multi-objective genetic algorithm based optimization method is used to identify the optimal design of gears and grooves in the lateral bushings. The performance of the design configurations were analyzed in detail by using HYGESIM (HYdraulic GEar machines SIMulator) Simulation tool. An optimal design of the machine was identified which was capable of maximizing the reduction (100%--68%) in flow variation, thereby providing lower delivery flow at the expense of reduced torque (hence reduced input power). The validity of the proposed novel VD-EGM was demonstrated using a proof of concept test performed using the prototypes of the optimal design. The simulated results provided by HYGESim were validated with those obtained from the measured data thereby accomplishing a very good agreement between the experimental data and the model predictions. The successful proof of concept test results, lead to the design of two flow control actuation systems which represent a manual system and an automatic pressure compensated system. The performances of the prototypes were analyzed using a steady state test rig. Experimental results show that the flow rate and input shaft torque reduces proportionally with displacement in the case of the manual flow control system. The measured volumetric efficiencies at lower levels of displacement were found to be lesser than those at maximum displacement, which are in line with the performance of typical other VD units in the market. The flow control actuation system based on pressure compensator principle was designed to reduce the flow automatically depending on the pressure at the outlet. Experimental performance of the VD-EGM with pressure compensated actuation system show that the delivered flow reduces automatically after the preset pressure is reached. The input shaft torque was also seen to reduce proportionally with the corresponding displacement. The experimental results show positive potentials in the working concept of the VD-EGM, which would lead to a new direction in designing cost effective VD units that can be used in place of fixed displacement units to provide the additional flow on demand functionality; thereby significantly increasing the overall energy efficiency of the hydraulic system in which the VD-EGM is used.
机译：这项研究提出了一种创新和独特的工作原理，用于可变输出外齿轮机（VD-EGM）。提出的设计不仅包含了传统外啮合齿轮机的所有众所周知的重要优点，而且还引入了一种用于改变排量（每单位转数输送的流量）的功能。在EGM中实现可变排量的新颖原理是基于排量腔/齿腔体积（TSV）与进/出口的连接的可变时间。通过在横向衬套内添加一个简单的元件（称为“滑块”）来获得定时变化。滑块的位置决定了每转一圈的流量。从设计的几何形状和提出的概念出发，推导了用于预测位移变化，流量和输入轴扭矩的解析表达式。通过这种工作原理，可以通过修改齿轮轮廓来显着增加位移的变化范围。因此，在这项工作中，借助于专门为此工艺开发的新型工具，设计了具有非对称齿形的新型齿轮。但是，由于齿轮啮合，EGM的位移作用具有固有的特性，因此不可能实现0％-100％的全流量变化。因此，为了最大化流量变化的范围，同时考虑将机器的所有其他重要性能保持在最佳状态，基于多目标遗传算法的优化方法用于确定横向齿轮和凹槽的最佳设计衬套。使用HYGESIM（液压GEar机器模拟器）仿真工具详细分析了设计配置的性能。确定了机器的最佳设计，该设计能够最大程度地减少流量变化（100％-68％），从而以降低扭矩（从而降低输入功率）为代价提供较低的输出流量。使用最佳设计的原型进行的概念验证测试证明了所提出的新型VD-EGM的有效性。由HYGESim提供的仿真结果已与从实测数据获得的结果进行了验证，从而在实验数据与模型预测之间达成了很好的一致性。概念测试结果的成功证明，导致设计了两个流量控制致动系统，分别代表手动系统和自动压力补偿系统。使用稳态测试装置分析了原型的性能。实验结果表明，在手动流量控制系统中，流量和输入轴扭矩与排量成比例地减小。发现在较低排量下测得的体积效率要小于最大排量下的体积效率，这与市场上其他典型VD装置的性能一致。设计了基于压力补偿器原理的流量控制执行系统，以根据出口处的压力自动减少流量。带有压力补偿驱动系统的VD-EGM的实验性能表明，达到预设压力后，输送的流量会自动减小。还可以看到输入轴扭矩与相应的排量成比例地减小。实验结果表明，VD-EGM的工作理念具有积极的潜力，这将为设计具有成本效益的VD装置提供新的方向，该装置可代替固定排量单位使用，以提供按需提供额外的流量功能；从而显着提高了使用VD-EGM的液压系统的整体能效。

著录项

  • 作者

    Devendran, Ram Sudarsan.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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