1.1 本试验方法包括在规定的制备、速度、赫兹应力、材料、温度和大气条件下，通过螺旋轨道摩擦计（SOT）在标准试样上进行试验时，定量测定润滑油和润滑脂的摩擦系数和寿命。本试验方法主要用于评估流体润滑剂在真空和环境条件下的寿命。 1.2 本标准可能涉及危险材料、操作和设备。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1 螺旋轨道摩擦计（SOT）的相关性- SOT旨在评估接触环境中液体润滑剂的相对降解率，该环境类似于在边界润滑状态下运行的角接触轴承。它作为一种筛选设备，用于快速选择润滑剂，评估润滑剂的各种成分（基础油、增稠剂或添加剂）在滚动、旋转和滑动条件下同时润滑触点的能力，并在必要时研究其化学分解。 SOT提供了一种方法来研究润滑油和润滑脂在运行过程中的摩擦学行为，同时它们会随着润滑领域中遇到的典型参数（温度、环境、使用的材料、施加的负载和速度）发生变化。试验结论定义为超过摩擦系数极限（通常比稳态值增加0.1）时。归一化润滑剂寿命定义为完成的轨道数除以使用的润滑剂初始量（μg）。 SOT最初开发用于评估空间应用的润滑剂，但也适用于传统环境。给出了真空中的一些结果( 图1 ). 目前，尚未公布环境条件下的测试数据（见 图2 ). 本试验方法的使用者应自行确定本试验程序的结果是否与现场性能或其他台架试验程序相关，并使其满意。 Bazinet，D.G.，Espinosa，M.A.，Loewenthal，S.H.，Gschwender，L.，Jones，W.R.，Jr.，Predmore，R。 E、 ，“使用四种空间液体润滑剂的扫描仪轴承的寿命”， 过程。37 第 航空航天机械。Symp。 , 约翰逊航天中心，2004年5月19-21日

1.1 This test method covers the quantitative determination of the friction coefficient and the lifetime of oils and greases, when tested on a standard specimen under specified conditions of preparation, speed, Hertzian stress, materials, temperature, and atmosphere, by means of the Spiral Orbit Tribometer (SOT). This test method is intended primarily as an evaluation of the lifetimes of fluid lubricants under vacuum and ambient conditions. 1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 Relevance of the Spiral Orbit Tribometer (SOT)— The SOT was designed to evaluate the relative degradation rates of liquid lubricants in a contact environment similar to that in an angular contact bearing operating in the boundary lubrication regime. It functions as a screening device to quickly select the lubricants, evaluate the ability of various components of a lubricant (base oil, thickener, or additive) to lubricate a contact in rolling, pivoting, and sliding conditions simultaneously, and study their chemical decomposition if necessary. The SOT provides a means to study the tribological behavior of oils and greases during operation, while they undergo changes as a function of typical parameters encountered in the lubrication field (temperature, environment, materials used, load applied, and speed). Test conclusion is defined to be when a friction coefficient limit (typically an increase of 0.1 above the steady state value) is surpassed. Normalized lubricant lifetime is then defined as the number of orbits completed divided by the initial amount of lubricant used (in μg). The SOT was initially developed to evaluate lubricants for space applications, but is also relevant for conventional environments. Some results in vacuum are presented ( Fig. 1 ). At this time, no data for tests in ambient conditions have been published (see Fig. 2 ). The user of this test method should determine to their own satisfaction whether results of this test procedure correlate with field performance or other bench test procedures. Bazinet, D.G., Espinosa, M.A., Loewenthal, S.H., Gschwender, L., Jones, W.R., Jr., Predmore, R.E., “Life of Scanner Bearings with Four Space Liquid Lubricants”, Proc. 37 th Aerospace Mech. Symp. , Johnson Space Center, May 19-21, 2004