活塞环-缸套摩擦磨损性能的实验研究

活塞环-缸套的摩擦学性能直接影响内燃机的工作性能,降低活塞环的磨损量对提高内燃机的可靠性和耐久性,保证内燃机经济、可靠地工作具有决定性的作用。文中通过实验得出活塞环-缸套在不同工况下的摩擦磨损性能,根据实验结果绘制曲线进行分析,从中找出活塞环-缸套摩擦磨损的有关规律。     

生物柴油中不饱和脂肪酸甲酯对内燃机油摩擦学性能的影响

为研究生物柴油中的不饱和组分对内燃机油的影响,在内燃机油中分别加入不同比例的不饱和脂肪酸甲酯和硬脂酸甲酯,通过四球摩擦磨损试验机考察不饱和脂肪酸甲酯对内燃机油减摩抗磨性能的影响,利用光学显微镜对磨损形貌进行分析。结果表明,不饱和脂肪酸甲酯在一定程度能够改善对内燃机油摩擦学特性,且随着不饱和脂肪酸甲酯含量的增大,内燃机油的减摩抗磨性能表现为逐渐增加的趋势;加有不饱和脂肪酸甲酯和硬脂酸甲酯的内燃机油氧化后摩擦学特性降低,且含不饱和脂肪酸甲酯的内燃机油氧化后摩擦学特性下降更为显著。     

阳极PED技术制备活塞环表面陶瓷涂层的研究

在内燃机中,由于摩擦产生的输出功率损失达到20%,可见摩擦磨损是影响内燃机燃油效率的关键因素,其中,活塞环-缸套摩擦副产生的摩擦在内燃机摩擦中占比超过50%,因此,改善活塞环组件的摩擦学性能对提高内燃机性能有着重要的意义。本文对活塞环表面改性、活塞环表面织构、润滑条件等影响活塞环摩擦学性能的因素进行了阐述,着重对利用阳极等离子体电解沉积(PED)技术制备活塞环表面涂层的技术研究进行了介绍,并给出一种利用该技术制备陶瓷涂层的方案供参考。     

内燃机缸套活塞环系统的摩擦学设计

本文在系统思想的指导下,采用理论分析与润滑计算相结合,对内燃机摩擦副缸套一活塞环系统在正常工作时的摩擦,润滑、磨损等摩擦学行为进行了探讨,并根据研究结果。以桶面环为对象,以Ｓ１９５单缸紫机机的参数为例,编掉了通用内燃机摩这设计软件,以实现对内燃机缸套一活塞环系统的摩擦学设计和使用效果的预测。     

中国机械工程学会摩擦学学会一九八四年工作总结

1.国内学术活动情况1984年经过总会批准,摩擦学学会安排了11项活动。它们是摩擦学工业调查,流体润滑与弹流测试技术座谈会,润滑理论计算座谈会,农业机械磨损技术交流会,内燃机三对摩擦副技术交流会,气体轴承技术讨论会,磨损测试技术座谈会,聚合物摩擦学特性座谈会,摩阻材料测试技术交流会,流体密封知识学习班,摩擦学教学工作座谈会。     

PTFE基三层滑动轴承材料与不同材料配副时的摩擦学特性

PTFE基三层滑动轴承复合材料与不同材料组成的摩擦副有着不同的摩擦学特性,研究这些摩擦副的摩擦学特性,对于优化摩擦副配副材料具有重要的实用价值。研究PTFE基三层复合材料与钢铁材料、有色金属以及聚合物材料进行配副时的摩擦磨损性能,通过扫描电镜观察磨损表面的微观形貌,分析不同摩擦副的摩擦磨损机制,并给出摩擦副配副的优选结果。结果表明:PTFE基三层滑动轴承材料与钢铁材料以及聚合物材料配副时,其磨损机制为剥层磨损,摩擦学性能较好;而与有色金属配副时,其磨损机制为黏着磨损,摩擦学性能较差。     

基于油液分析和时间序列模型的内燃机磨损状态监测方法

提出了一种基于油液分析和时间序列模型的内燃机磨损状态监测方法。将整个内燃机看作一个摩擦学系统,利用时间序列模型对摩擦学系统进行动态建模,建立能够表征内燃机磨损状态的数学模型。采用该模型对内燃机润滑油中各元素的变化趋势进行趋势分析,并应用实例对模型进行了检验。结果表明,该方法准确判断内燃机的磨损状态,为内燃机磨损状态监测提供了一种新的途径。     

摩擦学近况和进展

一、摩擦学在生产技术中的重要作用摩擦学是研究摩擦、磨损和润滑的科学。一般而言,摩擦是个现象,固体摩擦必有磨损,为了改善摩擦磨损,要加润滑,这三者有机地联系着,摩擦学就是研究这三方面内容。虽然摩擦学问题自古以来普遍存在,然而人们认识它并形成现代一门边缘学科,还仅仅是六十年代的事。二次大战后,机械工     

摩擦学近况和进展

<正> 一、摩擦学在生产技术中的重要作用摩擦学是研究摩擦、磨损和润滑的科学。一般而言,摩擦是个现象,固体摩擦必有磨损,为了改善摩擦磨损,要加润滑,这三者有机地联系着,摩擦学就是研究这三方面内容。虽然摩擦学问题自古以来普遍存在,然而人们认识它并形成现代一门边缘学科,还仅仅是六十年代的事。二次大战后,机械工业朝高速、重载和高温方向发展,导致人们对摩擦、磨损和润滑问题的兴趣不断增长。六十年代西方世界面临石油和能源危机,摩     

摩擦学研究及发展趋势

简要评述了摩擦学研究的进展.指出极端条件下的摩擦、磨损与润滑性能,分子水平上的摩擦磨损本质,环境友好润滑材料,摩擦学失效问题及摩擦学设计是摩擦学研究的主要方向.     

Piston Assembly Design for Improved Thermal-Tribological Performance

The tribological system in the piston assembly of an internal combustion engine includes contacts at interfaces of piston/piston ring/cylinder liner, piston skirt/cylinder wall, and piston/piston pin/ connecting rod. The thermal and tribological properties of the piston, piston rings, and cylinder wall are critical to the life and quality of the engine. Severe wear and scuffing failure, especially at the ring/ring groove and ring/liner interfaces, may present a major problem if the piston temperature is too high. Temperature considerations for the piston often limit the effort to increase the engine power.

A new engine piston incorporating the heat pipe cooling technology has been developed for reducing the piston temperature, especially in the ring land and along the piston wall. The current work aims at investigating the effect of reciprocating heat pipes on heat conduction in the piston, and thus the tribological behavior of the piston assembly. Due to the high thermal conductance of the reciprocating heat pipe, a considerably large amount of combustion heat, which is conventionally conducted through the piston wall, is transferred through heat pipes. This new design will result in a lower temperature on the piston wall and a reasonably low temperature distribution in the piston.     

发动机缸套-活塞环摩擦磨损特性试验研究

利用缸套-活塞环摩擦磨损试验台研究了速度，温度，载荷，供油等因素对缸套-活塞环系统摩擦磨损特性的影响。试验结果表明，缸套-活塞环摩擦副在发动机工作循环中润滑状态不断发生变化。在试验条件下，温度对摩擦磨损有显著影响，载荷和速度对摩擦力的影响较小。     

金属陶瓷添加剂对船舶主机汽缸套-活塞环摩擦学行为的影响

将普通CD40润滑油作为基础润滑油，在3种不同的载荷作用下，对含有金属陶瓷添加剂润滑油对汽缸套-活塞环摩擦磨损特性的影响进行了模拟试验研究，并与实际使用的普通CD40润滑油的试验结果进行了比较。研究结果表明，汽缸套-活塞环摩擦副在这种添加剂作用下，其磨损失重及摩擦因数都大幅度降低。摩擦副表面扫描电镜分析结果也表明，这种添加剂使摩擦表面更光滑，其本身具有表面自修复作用。     

A Model for Wear and Friction in Cylinder Liners and Piston Rings

Abstract

A one-dimensional elstohydrodynamic mixed lubrication wear and friction model is developed. The model can predict the effects of surface roughness, asperity contact, temperature-pressure-viscosity on wear, lubrication, and friction of the piston rings and cylinder liner. Wear is predicted based on the surface asperity contact pressure. The cylinder bore wear and the ring pack friction during an engine break-in are simulated and compared with the experimental results. The influence of cylinder wall temperature and surface roughness on friction and wear is investigated. The ring pack friction due to oil viscous shearing and asperity contact is found to reach its minimum at a certain oil temperature.     

船舶柴油机气缸套拉缸机理的试验研究

根据模拟试验的相似准则设计磨损试验,研究对船舶航行安全构成严重威胁的异常磨损现象,例如拉缸和咬缸。试验结果表明硬化相的性能和含量与试验所选用的材料耐磨性相一致,且随着载荷的增加,材料发生拉毛的时间呈指数关系下降,本文根据摩擦副三滑磨面接触模型,进而提出摩擦界面温度升高导致粘着以及摩擦副表面的强烈摩擦导致硬化相的碎裂甚至折断等因素是气缸套异常磨损的根本原因,为预防气缸套拉缸或者咬缸提供了理论依据。     

The use of surface metrology instrumentation to measure rates of wear of internal combustion engine components

A study was made of the effects of operating conditions on internal combustion engine service life. It was found after extensive investigation of major engine components (piston, piston rings, bearings and cylinder liner) that engine service life appears to be more a function of the acceptable wear of the cylinder liner than of any other engine parts.A method was developed to determine the amount of cylinder liner wear; this involved measuring the depth of scratch marks (using Talysurf model 3 or Surtronic 3 instruments). We describe the method employed and the results; these are at least as reliable as and give more details than conventional methods.     

Effect of Bio-Lubricant and Biodiesel-Contaminated Lubricant on Tribological Behavior of Cylinder Liner–Piston Ring Combination

This article addresses the issue of friction and wear characteristics of diesel engine cylinder liner–piston ring combinations under different lubricating conditions using a pin-on-disc wear tribometer. The discs were made out of actual engine cylinder liner material using a casting process. Pins were made out of top compression ring material. The tests were conducted on a pin-on-disc tribometer for wear and friction characteristics of the cylinder liner and piston ring combination with diesel-contaminated rapeseed oil–based bio-lubricant, diesel-contaminated commercial synthetic lubrication oil (SAE 20W40), biodiesel-contaminated commercial synthetic lubrication oil (SAE 20W40), and used (150 h) commercial synthetic lubrication oil (SAE 20W40). Experimental results demonstrated that the rapeseed oil–based bio-lubricant and biodiesel-contaminated synthetic lubricant exhibited better performance in terms of wear, friction, and frictional force under similar operating conditions. Thus, usage of newly formulated bio-lubricant and biodiesel in the long run may have a positive impact on engine life.     

Tribological performance of three advanced piston rings in the presence of MoDTC-modified GF-3 oils

The piston assembly (piston ring and cylinder bore) is one of the key parts of the internal combustion (IC) engine. Its performance will directly determine the performance of the whole engine. The piston assemblys tribological performance will be influenced by both its mechanical properties and the tribochemical interactions that take place on their surfaces. In this paper, three kinds of advanced stainless steel piston rings with a single nitrided layer, CrN coating on the nitrided layer and a B₄C and CrN binary-layer coating on the nitrided layer, respectively, were employed. Their frictional behavior and wear performance, when sliding against the cast iron cylinder bore materials lubricated with two kinds of GF-3 category mineral-based engine oils (one of them blended with MoDTC friction modifier), were investigated on a SRV tribotester. The test conditions were set and maintained to simulate engine-operating conditions. SEM (Scanning Electron Microscopy) and EDX (Energy Dispersive X-ray spectroscopy) were employed to characterize the morphology and elemental composition of the wear tracks. Tribotests and analysis results indicate that changes in both the mechanical properties of the tribomate (piston coatings) and tribochemical interactions (formulation of engine oils) have an impact on the tribological performance of the piston assembly. Tribochemical interactions will have a more obvious influence on friction coefficients while the mechanical properties of the tribomate have a more obvious influence on wear.     

Running-in wear of a compression ignition engine: Factors influencing the conformance between cylinder liner and piston rings

The conformance between the liner and rings of an internal combustion engine depends mainly on their linear wear (dimensional loss) during running-in. Running-in wear studies, using the factorial design of experiments, on a compression ignition engine show that at certain dead centre locations of piston rings the linear wear of the cylinder liner increases with increase in the initial surface roughness of the liner. Rough surfaces wear rapidly without seizure during running-in to promote quick conformance, so an initial surface finish of the liner of 0.8 μm c.l.a. is recommended. The linear wear of the cast iron liner and rings decreases with increasing load but the mass wear increases with increasing load. This discrepancy is due to phase changes in the cast iron accompanied by dimensional growth at higher thermal loads. During running-in the growth of cast iron should be minimised by running the engine at an initial load for which the exhaust gas temperature is approximately 180 °C.