共查询到20条相似文献,搜索用时 125 毫秒
1.
《润滑油》2014,(6):41-41
迫于同时开发重负荷柴油机油PC-11和乘用车汽油机油GF-6两个新发动机油规格的压力,润滑油和添加剂生产商希望这两个规格发布的期限可以再放宽一些。、2014年6月12日,PC-11规格开发小组描述了该规格所需的发动机程序试验的开发状态API新规格开发组之前曾表示目前API CJ-4发动机油的大部分试验和指标适用于新的PC-11规格,最终通过ASTM重负荷发动机油分类小组投票表决确定PC-11规格标准将从API CJ-4中保留6个发动机试验:通用汽车公司滚子从动件磨损试验、康明斯ISB气门磨损测试验、康明斯ISM试验、CATC13试验、Calerpillar 1N试验和Maek T-1l试验,这些试验将延用API CJ-4规格的指标。 相似文献
2.
3.
4.
5.
以Mack T-9发动机台架为研究工具,分析了8种柴油机油在500h台架试验过程中的烟炱含量、黏度、金属含量、总酸值、总碱值、硝化物和磷元素化学状态等性质的变化过程,探索了柴油机油性质的变化对缸套磨损的影响。试验结果表明:黏度稳定、抗氧化能力强和总碱值偏高的柴油机油有助于降低发动机磨损,分析结果将对高品质柴油机油的开发提供指导。 相似文献
6.
《润滑油》2014,(6):41
<正>迫于同时开发重负荷柴油机油PC-11和乘用车汽油机油GF-6两个新发动机油规格的压力,润滑油和添加剂生产商希望这两个规格发布的期限可以再放宽一些。2014年6月12日,PC-11规格开发小组描述了该规格所需的发动机程序试验的开发状态。API新规格开发组之前曾表示目前API CJ-4发动机油的大部分试验和指标适用于新的PC-11规格,最终通过ASTM重负荷发动机油分类小组投票表决确定PC-11规格标准将从API CJ-4中保留6个发动机试验:通用汽车公司滚子从动件磨损试验、康明斯ISB气门磨损测试验、康明斯ISM试验、CAT C13试验、Caterpillar 1N试验和Mack T-11试验,这些试验将延用API CJ-4规格的指标。另外,PC-11规格还将增加三个新的发动机程序试验,分别是用来测试腐蚀性和氧化性能的Mack T-13试验、CaterpillarC13通风试验以及衡量启动磨损的Daimler DD13试验。但是这几个程序试验的矩阵试验还没有最后确 相似文献
7.
对6种柴油机油在滚轮从动件(RFWT)发动机试验后的旧油进行了理化分析、核磁共振磷谱(31P NMR)分析,对RFWT试验件磨斑表面进行了X射线光电子能谱(XPS)深度刻蚀分析,结果表明: 碱性ZDDP、中性ZDDP及其初期降解产物二硫代磷酸酯构成的有效磷是抗磨的主要组分,有效磷含量越高,磨损越低;ZDDP及其降解产物在低磨损试验件表面形成了较厚的含有硫化物、硫酸盐、磷酸盐等化合物的保护膜,起到了抗磨作用。 相似文献
8.
9.
烟炱是柴油发动机磨损的主要原因之一,测试了烟炱对磨损的影响。在CI-4 10W-40,CI-4 5W-30,CJ-4 10W-40和CJ-4 5W-30柴油机油中均加入3.0%的碳黑以模拟烟炱,用四球机测试了这4个柴油机油的磨斑直径并评价柴油机油的抗烟炱磨损性能。CI-4 10W-40柴油机油的磨斑直径为0.47 mm,CI-4 5W-30柴油机油的磨斑直径为0.54 mm,CJ-4 10W-40柴油机油的磨斑直径为0.44 mm,CJ-4 5W-30柴油机油的磨斑直径为0.51 mm。在质量级别(CI-4或CJ-4)相同时,高黏度级别(10W-40)柴油机油的抗烟炱磨损性能优于低黏度级别(5W-30)的柴油机油。在黏度级别(10W-40或5W-30)相同时,高质量级别(CJ-4)柴油机油的抗烟炱磨损性能优于低质量级别(CI-4)的柴油机油。 相似文献
10.
废气再循环(EGR)技术路线和高压共轨燃油喷射(共轨)技术路线是目前用于柴油发动机的主要减排技术路线。通过行车试验,考察了不同技术路线的国Ⅲ商用车对柴油机油的性能要求,结果表明,采用EGR技术的国Ⅲ商用车所用的柴油机油变质快,发动机磨损大,对柴油机油的性能要求更高;而柴油共轨技术的国Ⅲ商用车对柴油机油的性能无特殊要求。 相似文献
11.
12.
50Mm行车试验表明,CJ-415W-40柴油机油具有优良的抗氧化性能和抗磨损性能,能够满足国Ⅳ排放标准的公交车的润滑要求,且表现出较好的燃油经济性。与CJ-415W-40柴油机油相比较,使用CJ-415W-40柴油机油可节省约3%的燃油消耗。 相似文献
13.
文章对几个不同抗磨剂方案的发动机油样品,在SRV-4型摩擦试验机进行了模拟试验评价,并利用SEM对磨斑形貌进行了分析,还进行了模拟发动机试验和标准TU3M发动机试验。试验结果表明:不同ZDDP方案、不同抗磨剂用量的样品在抗磨性能上表现出较大的差异。SRV摩擦试验机上的模拟评价结果与模拟发动机试验和标准TU3M发动机试验具有较好的一致性,初步表明采用SRV试验机来评价边界润滑下油品抗磨损性能的可行性。此外,还对模拟试验结果与发动机试验结果之间的对应性进行了探讨。 相似文献
14.
15.
16.
17.
18.
总结了评价润滑油燃料经济性发动机程序试验的发展历程,并介绍了下一代发动机油规格ILSAC GF-5开发新燃料经济性发动机程序试验的最新进展。燃料经济性要求的提高,使得目前发动机油的发展呈现出低粘度化的应用趋势;同时必须添加性能优异的摩擦改进剂以获得良好的燃料经济性。 相似文献
19.
Recent attempts to increase yields of distillate fuels from crude oil have resulted in a decline in the ignition quality of residual fuel oils and claims of ignition problems in large marine Diesel engines. This has revived an interest in fundamental studies of the ignition of liquid fuels and in new ways of defining and measuring ignition quality.
As part of an extensive study of the ignition of a range of residual fuels oils and during the development of novel teats of ignition quality it became obvious that thermal cracking of the fuel could play an important part in the pre-ignition chemistry. This paper reports kinetic data from simple experiments performed on the pyrolyses of residual fuel oils. Small samples and high heating rates were used to try to match the conditions inside a Blow-speed Diesel engine. This data has been used to assess the contribution that thermal cracking makes to ignition processes.
Pyrolyses were carried out on a small silica-coated platinum coil in the inlet of a gas chromatograph. Light hydrocarbon pyrolysis products were formed, and the extent and rate of cracking determined at four temperatures.
Assuming that reaction took place on a surface surrounding the oil and that a constant supply of reactants were available, pseudo zero order rate constants for the initial part of the reaction were evaluated. They showed an Arrhenius relationship with temperature giving an overall apparent activation energy of 110 kJ mol-1. Extrapolating rate constants to temperatures expected in Diesel engines, and assuming typical droplet sizes end ignition delays, it was shown that thermal cracking of fuels was possible before ignition and that it is likely that these reactions will have a strong influence on the processes leading to ignition. It was also shown that the presence of oxygen greatly increases the rate of thermal cracking. 相似文献
As part of an extensive study of the ignition of a range of residual fuels oils and during the development of novel teats of ignition quality it became obvious that thermal cracking of the fuel could play an important part in the pre-ignition chemistry. This paper reports kinetic data from simple experiments performed on the pyrolyses of residual fuel oils. Small samples and high heating rates were used to try to match the conditions inside a Blow-speed Diesel engine. This data has been used to assess the contribution that thermal cracking makes to ignition processes.
Pyrolyses were carried out on a small silica-coated platinum coil in the inlet of a gas chromatograph. Light hydrocarbon pyrolysis products were formed, and the extent and rate of cracking determined at four temperatures.
Assuming that reaction took place on a surface surrounding the oil and that a constant supply of reactants were available, pseudo zero order rate constants for the initial part of the reaction were evaluated. They showed an Arrhenius relationship with temperature giving an overall apparent activation energy of 110 kJ mol-1. Extrapolating rate constants to temperatures expected in Diesel engines, and assuming typical droplet sizes end ignition delays, it was shown that thermal cracking of fuels was possible before ignition and that it is likely that these reactions will have a strong influence on the processes leading to ignition. It was also shown that the presence of oxygen greatly increases the rate of thermal cracking. 相似文献