本SAE推荐实施规程旨在定义标准测试，为了跟上经验和技术进步的步伐，标准测试可能会频繁更改。在考虑使用时应牢记这一点。SAE 2号摩擦试验用于评估带有汽车变速器油液组合的自动变速器盘式离合器的摩擦特性。本文件的具体目的是定义µPVT测试，用于评估湿摩擦系统低速滑动特性随速度、温度和压力的变化。本程序旨在作为供应商和最终用户的建议方法。摩擦系统的供应商或用户选择的唯一变量是:摩擦材料流体反应板油流量（可选）在报告该测试结果时，必须清楚地识别这四个变量。 如果本文件中描述的任何测试参数或系统硬件发生了变化——除了摩擦材料、测试流体或反应板——则数据可能不会被报告为使用本文件获得的。该程序旨在评估斜坡速度摩擦特性，也称为扫掠，并可用于证明不同水平的滑动速度、施加压力和流体温度之间发生的容量变化。摩擦系数的水平以及扭矩容量随速度的趋势可用于比较候选材料或流体。

This SAE Recommended Practice is intended as the definition of a standard test, which may be subject to frequent change to keep pace with experience and technical advances. This should be kept in mind when considering its use.The SAE No. 2 friction test is used to evaluate the friction characteristics of automatic transmission plate clutches with automotive transmission fluid combinations.The specific purpose of this document is to define a µPVT test for the evaluation of the variation of wet friction system low speed slip characteristics as a function of speed, temperature, and pressure. This procedure is intended as a suggested method for both suppliers and end users.The only variables selected by the supplier or user of the friction system are:Friction materialFluidReaction platesOil flow (optional)These four variables must be clearly identified when reporting the results of this test. If any of the test parameters or system hardware as described in this document are changed—other than the friction material, test fluid, or reaction plates—the data may not be reported as being obtained using this document.This procedure is intended to evaluate ramped speed friction characteristics, also called sweeps, and can be used to demonstrate capacity changes that occur between the different levels of slip speed, applied pressure, and fluid temperature. The level of coefficient of friction, as well as the trends in torque capacity with speed, can be used to compare candidate materials or fluids.