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首页> 外文会议>Emissions measurement and testing, 2009 >The Design of Low-Inertia, High-Speed External Gear Pump/Motors for Hydrostatic Dynamometer Systems
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The Design of Low-Inertia, High-Speed External Gear Pump/Motors for Hydrostatic Dynamometer Systems

机译：静液压测功机系统低惯性，高速外齿轮泵/电动机的设计

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摘要

The demand for transient dynamometer testing systems is on the rise in the automotive industry. A useful power transmitting device for these systems is a hydraulic pump/motor due to its extremely low-inertia and minimal maintenance requirements. For a high-speed hydrostatic dynamometer system to be commercially acceptable, a pump/motor capable of speeds in excess of 8,000 RPM must be available with appropriate power capacity. Current industrial solutions offer speeds up to 3,000 RPM and 5,500 RPM respectively for external gear and piston pump designs and are therefore unsuitable for testing the upper speed ranges of numerous currently produced automotive engines.In this study, the effects of various pump housing, thrust plate and gear designs are examined utilizing Simerics' PumpLinx pump/motor specific CFD software. As speeds increase, external gear pump/motors can suffer from severe cavitation damage due to the fluid vapor produced when the gears disengage after the contact point passes the centerline of the mesh zone in the theoretical intake region. The pump/motor design must be optimized to decrease the speed of vapor bubble collapse and minimize the volume of vapor produced in the intake region. The proposed method is via controlled pressure application and the introduction of high pressure leakage from the outlet to the inlet. Once a suitable design is found, a prototype will be built and tested for wear on the gear sets and bearings at various speeds above 3,000 RPM and load pressures up to 5,000 psi.
机译：在汽车工业中，对瞬态测功机测试系统的需求正在上升。对于这些系统而言，一种有用的动力传输装置是液压泵/马达，因为它的惯性极低且维护需求最少。为了使高速静液压测功机系统获得商业上的接受，必须提供速度超过8,000 RPM的泵/电动机并具有适当的功率容量。当前的工业解决方案分别为外齿轮泵和活塞泵提供最高3,000 RPM和5,500 RPM的转速，因此不适合测试众多当前生产的汽车发动机的较高转速范围。在这项研究中，各种泵壳，止推盘的影响使用Simerics的PumpLinx泵/马达专用CFD软件检查齿轮和齿轮的设计。随着速度的增加，当齿轮在接触点经过理论进气区域的啮合区域的中心线后松开时，由于齿轮产生啮合时所产生的流体蒸气，外齿轮泵/电动机可能会遭受严重的气蚀损害。必须优化泵/电动机的设计，以降低气泡破裂的速度，并最大程度减少进气区域产生的蒸汽量。所提出的方法是通过控制压力的施加以及从出口到入口的高压泄漏的引入。一旦找到合适的设计，就将制造原型并测试齿轮组和轴承在高于3,000 RPM的各种速度和高达5,000 psi的负载压力下的磨损。

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