Theoretical and experimental evaluation of engine bearing performance
Theoretical and experimental evaluation of engine bearing performance
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发动机轴承性能的理论与实验评估
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Priest
中科院分区：
文献类型：
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作者：
R. Mufti;M. Priest
摘要 在燃烧条件下对单缸汽油发动机进行了发动机轴承总摩擦的测量。通过测量总发动机摩擦、活塞组件摩擦和气门机构摩擦来间接测量轴承摩擦。发动机总摩擦通过压力-体积（PV）图测量，而活塞组件摩擦测量则使用指示的平均有效压力方法进行。使用仪表化凸轮轴驱动皮带轮测量气门机构摩擦力。所有发动机辅助设备均独立电力驱动。在不同的发动机工作条件下测量发动机轴承摩擦。尽管在较低的发动机转速和较高的润滑剂温度下，发生了从流体动力润滑状态到边界/混合润滑状态的转变，但在大多数发动机操作条件下发生了流体动力润滑状态。研究了两种不同的润滑剂 SAE 0W20 和 SAE 5W30 对发动机轴承性能的影响。低润滑剂温度下粘性油的不利影响是显着的，而较高润滑剂温度下的好处也是显着的。将多个发动机轴承摩擦数学模型的预测结果与实验结果进行了比较。对比研究表明，空化条件下短轴承迁移率方法得到的结果与实验数据接近。该实验系统可用于研究轴承设计参数、轴承材料、润滑油化学和发动机运行条件对其原始环境中真实条件下轴承性能的影响。
Abstract Measurements of total engine bearing friction have been carried out on a single-cylinder gasoline engine under fired conditions. The bearing friction was measured indirectly by measuring the total engine friction, piston assembly friction, and valve train friction. Total engine friction was measured via pressure-volume (PV) diagram, whereas piston assembly friction measurement was carried out using the indicated mean effective pressure method. Valve train friction was measured using instrumented camshaft drive pulleys. All the engine auxiliaries were independently driven electrically. Engine bearing friction was measured under different engine operating conditions. The hydrodynamic lubrication regime occurred under most of the engine operating conditions, although at lower engine speeds and higher lubricant temperatures a transition from hydrodynamic to boundary/mix lubrication regime occurred. The effect of two different lubricants SAE 0W20 and SAE 5W30 on engine bearing performance was investigated. The adverse effects of viscous oil at low lubricant temperature were notable, as were the benefits at higher lubricant temperature. Predicted results from a number of engine bearing friction mathematical models have been compared with the experimental results. The comparative study showed that the results generated through the short bearing mobility method under cavitation conditions were close to the experimental data. This experimental system can be used to study bearing design parameters, bearing materials, lubricant chemistry, and engine operating conditions on the bearing performance under realistic conditions in its original environment.