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Quantitative Measurement of Soot Particles in Oil-Film by Image Analysis and Laser Scattering Method for Research on Mechanism of Friction and Wear

图像分析和激光散射法定量测量油膜中烟灰颗粒研究摩擦磨损机理

基本信息

批准号：
16560129
负责人：
SOEJIMA Mitsuhiro
金额：
$ 2.69万
依托单位：
Kyushu Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

(1)The effect of lowering the oil viscosity from SAE10W-30 to SAE5W-30 on the reduction of frictional power loss in diesel engines becomes larger when the class is modified from the CD oils to the DH oils, that is DH-1 or DH-2, lower in sulfated ash, phosphorous and sulfur named as Low-SAPS oils to protect the diesel particulate filter and the deNOx catalyst.(2)Shot-peening is more desirable than grinding as the surface finish for the sintered cam lobes of compound camshafts in the valve train with roller followers because the influence of surface finish and roughness on the friction loss and wear is quite small. The surface roughness should be larger than one micron and smaller than around three microns root mean square. Also, the friction loss from the roller follower supported by the needle bearing is larger than that from the one supported by the slide bearing.(3)The oil viscosity hardly changes the friction between cam and roller is small but it reduces the friction of other eleme … More nts in the valve train.(4)The additional supplement of the anti-wear and friction modifier additives, ZnDTP and MoDTC, into semi-used engine oils is effective to reduce the friction and wear for the cam and slipper follower. When contaminated with the soot kinds more than one in mass percentage, however, the effect for the wear becomes remarkably low while the effect for the friction is scarcely kept obvious. In order to reduce both the friction and the wear rate, the supplement of the additives into the oil should be more than around six in mass percentage and the allowable rate of soot contamination in the oil is less than around one in mass percentage.(5)The size distribution of soot particles in engine oils measured by the image analysis coincides with that measured by the laser scattering method so that both methods have high accuracy in measurement for the soot size. The amount of the dispersant markedly influences the size distribution of soot particles in the oil. The friction is low but the wear rate is somewhat high when the soot contamination is slight, while both the friction and the wear rate are remarkably high when that is much. Also, both the friction and the wear rate are low when the size of soot is small, while the both of them increase as the size of soot becomes large because of the coagulation. Accordingly, not only the soot coagulation causing the oil starvation in the sliding contact area namely the increase of soot size should be prevented by the dispersant but any soot particles coagulated with the wear debris and the hard sludge causing the abrasive wear should be removed from engine oils. Less

（1）当类别从CD油改性为DH油（即DH-1或DH-2）时，将油粘度从SAE 10 W-30降低到SAE 5 W-30对柴油发动机中摩擦功率损失的降低的效果变得更大，所述DH油在硫酸化灰分、磷和硫方面更低，称为低SAPS油以保护柴油颗粒过滤器和脱NOx催化剂。（2）对于滚子从动件配气机构中的复合凸轮轴的烧结凸轮凸角，由于表面光洁度和粗糙度对摩擦损失和磨损的影响很小，所以喷丸处理比磨削处理更可取。表面粗糙度应大于1微米，小于约3微米均方根。而且，由滚针轴承支承的滚子从动件的摩擦损失大于由滑动轴承支承的滚子从动件的摩擦损失。（3）油液粘度对凸轮与滚子之间的摩擦力影响不大，但对其它元件的摩擦力有一定的减小作用。 ...更多信息气门机构中的nts。（4）在半废发动机油中添加ZnDTP和MoDTC抗磨减摩添加剂，可有效地降低凸轮和滑靴从动件的摩擦磨损。然而，当污染的碳烟种类的质量百分比超过一种时，对磨损的影响变得非常低，而对摩擦的影响几乎不保持明显。为了降低摩擦和磨损率，添加剂在油中的添加量应大于6质量%，油中允许的碳烟污染率小于1质量%。（5）通过图像分析测量的发动机油中烟灰颗粒的尺寸分布与通过激光散射法测量的一致，使得两种方法在烟灰尺寸的测量中具有高精度。分散剂的用量显著影响油中碳烟颗粒的尺寸分布。当碳烟污染较轻时，摩擦力较低，但磨损率偏高;当碳烟污染较多时，摩擦力和磨损率都很高。当碳烟颗粒较小时，摩擦系数和磨损率都较低，而当碳烟颗粒较大时，由于碳烟颗粒的凝聚作用，摩擦系数和磨损率都增大。因此，不仅应通过分散剂防止导致滑动接触区域中的缺油的烟灰凝结，即烟灰尺寸的增加，而且应从发动机油中除去与磨损碎屑和硬淤渣凝结的任何烟灰颗粒，从而导致磨料磨损。少