本SAE推荐规程旨在作为标准试验的定义，但可能会随着经验和技术进步而频繁更改。在考虑使用时，应牢记这一点。SAE 2号摩擦试验机用于评估自动变速器盘式离合器与汽车变速器油液的摩擦特性。它还可用于对湿摩擦系统进行耐久性测试。本文件的具体目的是定义6000 rpm的阶梯式功率测试，以评估湿摩擦系统性能随功率水平的变化。 本程序使用6000 rpm的初始啮合速度，并作为供应商和最终用户共同使用的标准程序。摩擦系统的供应商或用户选择的唯一变量是:a.摩擦材料B。Fluidc。反应板在报告使用本试验的结果时，必须明确确定这三个变量。如果本文件中所述的任何试验参数或系统硬件发生变化（摩擦材料、试验流体或反应板除外），则不得报告使用本文件获得的数据。 本程序不用于评估初始系数或磨合特性。有关此信息，请参阅SAE J2490 SAE 2号摩擦试验机？PVT测试。

This SAE Recommended Practice is intended as the definition of a standard test, but 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 Machine is used to evaluate the friction characteristics of automatic transmission plate clutches with automotive transmission fluids. It can also be used to conduct durability tests on wet friction systems.The specific purpose of this document is to define a 6000 rpm stepped power test for the evaluation of wet friction system performance variation as a function of power level. This procedure uses an initial engagement speed of 6000 rpm and is intended as a standard procedure for common use by both suppliers and end users.The only variables selected by the supplier or user of the friction system are:a. Friction materialb. Fluidc. Reaction platesThese three variables must be clearly identified when reporting the results of using 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 having been obtained using this document.This procedure is not intended to evaluate the initial coefficient or break-in characteristics. For this information, refer to SAE J2490 SAE No. 2 Friction Test Machine ¿¿¿PVT test.