A study on highly-loaded contacts under dry lubrication for gear applications
A study on highly-loaded contacts under dry lubrication for gear applications
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DOI：
10.1016/j.triboint.2018.07.016
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发表时间：
2018-12
影响因子：
6.2
通讯作者：
M. Yilmaz;D. Kratzer;T. Lohner;K. Michaelis;K. Stahl
中科院分区：
文献类型：
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作者：
M. Yilmaz;D. Kratzer;T. Lohner;K. Michaelis;K. Stahl
变速箱中高负荷的触点通常由油或润滑脂润滑，以减少摩擦和磨损并散热。取消流体润滑剂将显著减少变速箱的空载损失，并省去昂贵的密封件。在干润滑条件下，表面涂层具有很强的提高摩擦学接触耐磨性的潜力，并具有较低的摩擦性能。以渗碳16MnCr5钢为基材，研究了齿轮在干润滑条件下的高负荷无涂层和涂层触头。在双盘试验机上对未涂层、四面体非晶碳(ta-C)涂层和二硫化钼(MoS_2)涂层表面进行了摩擦模拟实验和理论研究。所有的实验研究都伴随着摩擦和温度的测量以及表面照片和粗糙度的测量。实验结果表明，在干润滑条件下，涂层触头的摩擦学性能比没有涂层的触头有显著的提高。然而，其摩擦学性能无法与高负荷的润滑接触相媲美。基于参数研究的理论结果表明，涂层的导热系数和弹性模数分别对接触温度和von Mise应力分布的影响最大。
Highly-loaded contacts in gearboxes are usually lubricated by oil or grease in order to reduce friction and wear and to dissipate heat. Eliminating the fluid lubricant would reduce the no-load losses of gearboxes significantly and omit the use of expensive seals. Surface coatings have strong potential to improve the wear resistance in tribological contacts under dry lubrication, combined with low friction properties. The aim of this study is to investigate highly-loaded uncoated and coated contacts under dry lubrication for gear applications.Case-carburized steel 16MnCr5 was considered as substrate material. Uncoated, tetrahedral amorphous carbon (ta-C) coated and molybdenum disulphide (MoS2) coated surfaces were investigated experimentally at a twin-disk test rig and theoretically by means of tribosimulations. All experimental investigations were accompanied by friction and temperature measurements as well as by surface photos and roughness measurements.The experimental results show that under dry lubrication coated contacts can have significant improved tribological performance compared to uncoated contacts. However, the tribological performance is not comparable with highly-loaded lubricated contacts. The theoretical results based on a parametric study show that the thermal conductivity and the modulus of elasticity of the coating have the strongest effect on the contact temperature and the von Mises stress distribution, respectively.