滚动轴承和滚珠丝扛中润滑油脂的外溅性

Out particles of Lubricating Grease in Rolling Bearings and Ball Screws

滚动轴承或直线运动轴承中的润滑油脂，可能飞溅出颗粒，粘附在液晶制品或硬盘上，导致设备失效。所以，这种设备轴承所使用的润滑油脂尽可能降低飞溅性。但低飞溅性的润滑油脂可能带来耐磨性、噪声、阻力矩等问题。因此，我们需要一种油脂，它既具有低飞溅性，又有较高的性能和使用寿命。为了开发低飞溅性的油脂，作者研究了油脂成分和飞溅性的关系。一些数据下面会提到。飞溅颗粒的多少和基油成分有很大关系，例如，润滑油脂基油是矿物油或合成碳化氢油，它们极性低，飞溅颗粒少；相反，如果是酯油，它的极性高，飞溅性也高。飞溅颗粒的多少也取决于增稠剂的类型和含量，例如浓的润滑油脂的飞溅数量少。作者证实了飞溅出来的颗粒不仅有基油颗粒，而且有细小的油脂颗粒，油脂颗粒的直径范围在０．１１ 到０．２μｍ 。

The out particles of lubricating grease, which are splashed from rolling bearings or linear motion bearings, adhere to liquid crystal manufacturing equipment or hard disks, resulting in damage to product functions or capability. For such applications, low out particle greases are packed into the bearings. Low out particle greases, however, have problems with endurance wear resistance, noise, torque, etc. Therefore, a low out particle grease, which has both high capability and long life, has been requested. To develop a better low out particle grease, the authors studied the relation between the grease components and splashing. Some of the results may be summarized as follows. The splashing amount depends on the kind of base oil, for instance, if a mineral oil or synthetic hydrocarbon oil, which has a low polarity, is used, then the splashing is decreased. On the other hand, if an ester oil, which has a high polarity, is used, then the splashing is increased. The splash amount also depends on the kind and amount of the thickener; for example, a thicker(or harder) grease has a smaller splashing amount. The authors confirmed that the out particles consisted not only of base oil separated from the grease, but also of minute grease particles. Greases that splashed a significant amount had particles with a diameter size range of 0.11 to 0.2μm.