Frictional evaluation of thermally sprayed coatings applied on the cylinder liner of a heavy duty diesel engine : pilot tribometer analysis and full scale engine test
Frictional evaluation of thermally sprayed coatings applied on the cylinder liner of a heavy duty diesel engine : pilot tribometer analysis and full scale engine test
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DOI：
10.1016/j.wear.2011.06.021
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发表时间：
2011-11
期刊：
影响因子：
5
通讯作者：
Staffan Johansson;C. Frennfelt;A. Killinger;P. Nilsson;R. Ohlsson;B. Rosén
中科院分区：
文献类型：
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作者：
Staffan Johansson;C. Frennfelt;A. Killinger;P. Nilsson;R. Ohlsson;B. Rosén
活塞系统约占内燃机机械摩擦的一半，因此优化非常重要。为了优化缸套与活塞环/活塞之间的接触摩擦影响，对不同热喷涂缸套进行了研究。一种新型的摩擦测试装置被用来扫描通过不同的材料在不同的运行条件。两种缸套材料的摩擦系数明显低于其他试验材料CrC-NiCr和MMC。所有的热喷涂气缸套磨损明显小于参考材料。基于这些结果，进行了全尺寸单缸试验，以验证试验台的结果。将热喷涂气缸套MMC与参考气缸套进行比较，除了在低速和高压下的一种情况外，测试显示MMC气缸套的摩擦扭矩更高。对摩擦计和发动机之间的结果的分析指出了粘性摩擦损失和机械摩擦损失之间的比率的重要性。热喷涂层（MMC）摩擦扭矩较高的最可能原因是气缸套的功能表面促进了粘性摩擦的增加。
The piston system accounts for roughly half of the mechanical friction of an internal combustion engine, thus it is important to optimize. Different thermally sprayed cylinder liners were investigated in order to optimize the frictional impact of the contact between cylinder liner and piston ring/piston. A novel tribometer test setup was used to scan through different materials at different running conditions. Two cylinder liner materials showed significantly lower friction than the other tested materials, CrC–NiCr and MMC. All the thermally sprayed cylinder liners were worn significantly less than the reference material. Based on these results a full-scale single cylinder test was performed to validate the results from the rig. Comparing the thermally sprayed cylinder liner MMC with reference cylinder liner the test showed higher friction torque for the MMC cylinder liner except in one case; at low speed and high pressure. An analysis of the results between the tribometer and the engine points at the importance of the ratio between viscous and mechanical friction losses. The most probable cause of higher friction torque for the thermally sprayed coating (MMC) is that the functional surface of the cylinder liner promotes an increase in viscous friction.