LUBRICATION MECHANISM OF SOLID LUBRICANTS PARTICLES ADDED INTO LUBRICATING PILS

通过两个滚子与滚动轴承在摆动运动中的滚动滑动接触，考察了含固体润滑剂颗粒的润滑油或润滑脂的抗划伤能力和抗微动磨损能力。作为抗微动能力的参考，研究了滚压载荷、振动角、频率等运行条件对滚动轴承微动寿命的影响。提出了一种新的评价滚动滑动接触条件下润滑油抗点蚀性能的试验方法。研究结果如下：1.考察了含二硫化钼、氧化锌、氟化碳、氮化硼等微粒的润滑油的抗磨性能。(1)氟化碳、氮化硼与分散剂复配使用，具有良好的防划伤性能，降低了摩擦因数。2.由于试验辊表面粗糙度对点蚀寿命有决定性的影响，因此提出了一种试验油不更换硬辊的新试验方法，并通过试验证明是有效的。3.对于滚动轴承因微动而产生的严重磨损，即所谓的伪褐化，用振荡数来定义微动寿命，直到内圈因磨损而相对于外圈的相对位移达到阈值为止。(1)在润滑脂润滑的情况下，随着温度的升高，油膜的形成状态(用电阻法测量)变得更好，微动寿命增加。(2)振动角度和频率对微动寿命的影响与油膜的形成状态有关。(3)含二硫化钼的润滑脂在不生成油膜的条件下表现出良好的抗微动能力。

Scoring proof capability and fretting proof capability of lubricating oils or grease containing solid lubricantsparticles have been investigated by roliing-sliding contact of two rollers and rolling bearings in oscillatory motion. As a reference of fretting proof capability, the effect of operatlng condition such as racial load, oscillationangle and frequency on fretting llfe of osciallatory bearing was studied. And a new test methcd to evaluate antipittinvg performance of lubricating oiis in rolling-sllding contact. th findings are as foll0ws :1.Scoring proof capability of lubricating oils containing particles of molybdenum disulfide, graptdte, carbonfluoride or boron nitride were investigated. (1) Carbon fiuoride and boron nitride added together with a dispers-ant have good scoring proof capability and decrease the coefficient of friction. (2) Addition of molybdenum disfilnde or graphite neither improved scoring proof cability nor modified the frictional characteristics.2.Because the effect of surface roughness of test rollers has decisive effect on pitting life, a new test method in wich the harder roller is not replaced for test oils to be evaluated was phned and proved effective by experiments.3.As for the quite heavy wear in rolling bearings in oscillatory motion due to fretting, which is called as false brinelling, the fretting life was defined with the oscillation number until the relative displacement of the innerring to the outer ring due to wear reached to a threshold. (1) In the case of grease lubrication, as temperature rises, the state of oil-film formation (measured by the electric reslstancc methcd) becomes beetter and the fretting llfe increases. (2) the effect of the oscillation angle and frequency on fretting life can be correlated with thestate of oil-filn formation. (3) A grease containing molydenum disulfide exhibited the pcxssibillty of frettingproof capabillty in the condition in which oil-fiim did not formed.