本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考资料和持续适用性或技术要求。新技术可能存在。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带自动变速器油液的自动变速器盘式离合器的摩擦特性。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基于从3600 r/min步进功率试验或6000 r/min步进功率试验中选择的特定功率水平，定义耐久性试验，以评估湿摩擦系统性能随循环次数的变化。 本标准程序供供应商和最终用户共同使用，以便对湿摩擦材料系统性能进行客观比较。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、 流体；c.反应板。在报告测试结果时，必须明确这三个变量。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gmPVT测试。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.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 Durability Test based on a specific power level selected from either the 3600 r/min Stepped Power Test or from the 6000 r/min Stepped Power Test, for the evaluation of wet friction system performance variation as a function of number of cycles. This standard procedure is intended for common use by both suppliers and end users to allow objective comparisons of wet friction material system performance.The only variables selected by the supplier or user of the friction system are: a. Friction Material; b. Fluid; and c. Reaction Plates.These three 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 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 \gmPVT Test.